/* ═══════════════════════════════════════════════════════════════
   Natascha2o Chat — Crystal Glassmorphism Theme
   Light mode default, dark mode via html.dark or prefers-color-scheme
   ═══════════════════════════════════════════════════════════════ */

/* ── CSS Custom Properties ── */
:root {
    /* Background */
    --bg-top: #f0f4f8;
    --bg-bottom: #e8edf3;

    /* Text */
    --text-primary: #1e2430;
    --text-secondary: #5a6580;
    --text-muted: #8694ab;

    /* Accent */
    --accent: #3d8fd4;
    --accent-dark: #2b6fa8;
    --accent-light: rgba(61,143,212,0.12);
    --accent-glow: rgba(61,143,212,0.25);

    /* Glass */
    --glass-fill: rgba(255,255,255,0.42);
    --glass-fill-subtle: rgba(255,255,255,0.25);
    --glass-fill-dense: rgba(255,255,255,0.55);
    --glass-blur: blur(12px);
    --glass-border-top: rgba(255,255,255,0.45);
    --glass-border-left: rgba(255,255,255,0.35);
    --glass-border-bottom: rgba(255,255,255,0.08);
    --glass-border-right: rgba(255,255,255,0.10);
    --glass-shadow: 0 8px 32px rgba(100,140,200,0.06), inset 0 1px 0 rgba(255,255,255,0.3);
    --glass-shadow-hover: 0 12px 48px rgba(100,140,200,0.10), inset 0 1px 0 rgba(255,255,255,0.4);

    /* Shine sweep */
    --shine-opacity-peak: 0.35;
    --shine-opacity-mid: 0.18;
    --shine-opacity-edge: 0.03;

    /* Messages */
    --msg-user-bg: rgba(61,143,212,0.10);
    --msg-assistant-bg: rgba(255,255,255,0.42);

    /* Code */
    --code-bg: rgba(30,36,48,0.06);
    --code-border: rgba(30,36,48,0.08);
    --code-text: #1e2430;
    --code-header-bg: rgba(30,36,48,0.08);

    /* Input */
    --input-bg: transparent;
    --input-placeholder: #8694ab;

    /* Scrollbar */
    --scrollbar-thumb: rgba(100,140,200,0.18);
    --scrollbar-thumb-hover: rgba(100,140,200,0.30);

    /* Sidebar */
    --sidebar-width: 280px;
    --sidebar-divider: rgba(100,140,200,0.10);
    --conversation-hover: rgba(255,255,255,0.25);
    --conversation-active: rgba(61,143,212,0.08);

    /* Overlay */
    --overlay-bg: rgba(30,36,48,0.35);

    /* Fonts */
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'DM Serif Text', serif;
    --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', Consolas, monospace;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-smooth: 0.3s cubic-bezier(0.25,0.46,0.45,0.94);
    --transition-shine: 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}


/* ── Dark Mode — True black, flat, minimal ── */
html.dark,
html.dark body {
    --bg-top: #000000;
    --bg-bottom: #000000;

    --text-primary: #d4d4d4;
    --text-secondary: #888888;
    --text-muted: #555555;

    --accent: #4da3e8;
    --accent-dark: #3d8fd4;
    --accent-light: rgba(77,163,232,0.12);
    --accent-glow: rgba(77,163,232,0.20);

    /* Flat — no glass, no blur, no shine */
    --glass-fill: #111111;
    --glass-fill-subtle: #0a0a0a;
    --glass-fill-dense: #161616;
    --glass-blur: blur(0px);
    --glass-border-top: #1a1a1a;
    --glass-border-left: #1a1a1a;
    --glass-border-bottom: #1a1a1a;
    --glass-border-right: #1a1a1a;
    --glass-shadow: none;
    --glass-shadow-hover: none;

    /* No shine in dark mode */
    --shine-opacity-peak: 0;
    --shine-opacity-mid: 0;
    --shine-opacity-edge: 0;

    --msg-user-bg: #111111;
    --msg-assistant-bg: #0a0a0a;

    --code-bg: #0a0a0a;
    --code-border: #1a1a1a;
    --code-text: #d4d4d4;
    --code-header-bg: #111111;

    --input-placeholder: #555555;

    --scrollbar-thumb: #222222;
    --scrollbar-thumb-hover: #333333;

    --sidebar-divider: #1a1a1a;
    --conversation-hover: #161616;
    --conversation-active: rgba(77,163,232,0.10);

    --overlay-bg: rgba(0,0,0,0.70);
}

/* Dark mode: kill background radial gradients */
html.dark body::before {
    background: none !important;
}

/* Dark mode: disable shine sweep and sheen pseudo-elements */
html.dark .glass-panel::before,
html.dark .glass-panel::after,
html.dark .message-content::before,
html.dark .message-bubble::before,
html.dark .input-wrapper::before,
html.dark .suggestion-card::before,
html.dark .suggestion-card::after,
html.dark .settings-modal::before,
html.dark .btn::after,
html.dark .btn-primary::after,
html.dark .btn-new-chat::after,
html.dark .send-btn::after {
    display: none !important;
}

/* Dark mode: remove backdrop-filter everywhere */
html.dark .sidebar,
html.dark .top-bar,
html.dark .input-wrapper,
html.dark .message-content,
html.dark .message-bubble,
html.dark .suggestion-card,
html.dark .settings-modal,
html.dark [role="dialog"] {
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
}

@media (prefers-color-scheme: dark) {
    html:not(.light) {
        --bg-top: #000000;
        --bg-bottom: #000000;
        --text-primary: #d4d4d4;
        --text-secondary: #888888;
        --text-muted: #555555;
        --accent: #4da3e8;
        --accent-dark: #3d8fd4;
        --accent-light: rgba(77,163,232,0.12);
        --accent-glow: rgba(77,163,232,0.20);
        --glass-fill: #111111;
        --glass-fill-subtle: #0a0a0a;
        --glass-fill-dense: #161616;
        --glass-blur: blur(0px);
        --glass-border-top: #1a1a1a;
        --glass-border-left: #1a1a1a;
        --glass-border-bottom: #1a1a1a;
        --glass-border-right: #1a1a1a;
        --glass-shadow: none;
        --glass-shadow-hover: none;
        --shine-opacity-peak: 0;
        --shine-opacity-mid: 0;
        --shine-opacity-edge: 0;
        --msg-user-bg: #111111;
        --msg-assistant-bg: #0a0a0a;
        --code-bg: #0a0a0a;
        --code-border: #1a1a1a;
        --code-text: #d4d4d4;
        --code-header-bg: #111111;
        --input-placeholder: #555555;
        --scrollbar-thumb: #222222;
        --scrollbar-thumb-hover: #333333;
        --sidebar-divider: #1a1a1a;
        --conversation-hover: #161616;
        --conversation-active: rgba(77,163,232,0.10);
        --overlay-bg: rgba(0,0,0,0.70);
    }
    html:not(.light) body::before {
        background: none !important;
    }
}


/* ── Reset & Base ── */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: var(--font);
    background: linear-gradient(180deg, var(--bg-top) 0%, var(--bg-bottom) 100%);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Fixed background radial gradients on GPU-composited layer */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    z-index: -1;
    background:
        radial-gradient(ellipse at 20% 30%, rgba(180,210,240,0.25) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 70%, rgba(200,180,230,0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 90%, rgba(180,220,200,0.12) 0%, transparent 40%);
    will-change: transform;
}

html.dark body::before {
    background:
        radial-gradient(ellipse at 20% 30%, rgba(40,80,140,0.12) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 70%, rgba(80,50,120,0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 90%, rgba(30,80,100,0.08) 0%, transparent 40%);
}

/* Selection */
::selection {
    background: var(--accent-light);
    color: var(--text-primary);
}


/* ── Scrollbars ── */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-thumb-hover);
}

/* Firefox */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--scrollbar-thumb) transparent;
}


/* ═══════════════════════════════════════════════════════════════
   LAYOUT
   ═══════════════════════════════════════════════════════════════ */

.app-container {
    display: flex;
    height: 100vh;
    height: 100dvh;
    width: 100%;
    position: relative;
}


/* ── Sidebar ── */
.sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    background: var(--glass-fill);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-right: 1px solid var(--sidebar-divider);
    box-shadow: var(--glass-shadow);
    position: relative;
    z-index: 10;
    transition: transform var(--transition-smooth);
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 16px 12px;
    border-bottom: 1px solid var(--sidebar-divider);
}

.sidebar-header .logo {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    color: var(--text-primary);
    letter-spacing: 0.01em;
    user-select: none;
}

.sidebar-search {
    padding: 8px 12px;
}

.sidebar-search input {
    width: 100%;
    padding: 8px 12px;
    background: var(--glass-fill-subtle);
    border: 1px solid var(--glass-border-bottom);
    border-radius: 0;
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 0.85rem;
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.sidebar-search input::placeholder {
    color: var(--text-muted);
}

.sidebar-search input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-light);
}

.sidebar-conversations {
    flex: 1;
    overflow-y: auto;
    padding: 4px 0;
}

.conversation-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 0.875rem;
    border-left: 3px solid transparent;
    transition: background var(--transition-fast),
                color var(--transition-fast),
                border-color var(--transition-fast);
    position: relative;
    overflow: hidden;
    user-select: none;
}

.conversation-item:hover {
    background: var(--conversation-hover);
    color: var(--text-primary);
}

.conversation-item.active {
    background: var(--conversation-active);
    border-left-color: var(--accent);
    color: var(--text-primary);
    font-weight: 500;
}

.conversation-item.pinned::before {
    content: '';
    position: absolute;
    top: 6px;
    right: 10px;
    width: 6px;
    height: 6px;
    background: var(--accent);
    border-radius: 50%;
    opacity: 0.6;
}

.conversation-item .conversation-title {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.conversation-item .conversation-time {
    font-size: 0.72rem;
    color: var(--text-muted);
    white-space: nowrap;
}

.sidebar-footer {
    padding: 12px 16px;
    border-top: 1px solid var(--sidebar-divider);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.sidebar-footer .btn-icon {
    color: var(--text-muted);
}

.sidebar-footer .btn-icon:hover {
    color: var(--text-primary);
}


/* ── Main Content ── */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    position: relative;
}

/* ── Top Bar ── */
.top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    background: transparent;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    border-bottom: 1px solid var(--sidebar-divider);
    min-height: 52px;
    position: relative;
    z-index: 5;
}

.top-bar .chat-title {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-primary);
}

.top-bar .chat-subtitle {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-left: 8px;
}


/* ═══════════════════════════════════════════════════════════════
   CHAT MESSAGES
   ═══════════════════════════════════════════════════════════════ */

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 24px 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.message {
    display: flex;
    flex-direction: column;
    max-width: 75%;
    position: relative;
    animation: messageIn 0.3s cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes messageIn {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message.user {
    align-self: flex-end;
    align-items: flex-end;
}

.message.assistant {
    align-self: flex-start;
    align-items: flex-start;
}

.message-content {
    position: relative;
    padding: 12px 16px;
    font-size: 0.925rem;
    line-height: 1.65;
    overflow: hidden;
    border: 1px solid transparent;
    transition: box-shadow var(--transition-fast);
}

/* Static diagonal sheen on message bubbles */
.message-content::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        120deg,
        rgba(255,255,255,0) 0%,
        rgba(255,255,255,0.04) 40%,
        rgba(255,255,255,0.08) 50%,
        rgba(255,255,255,0.04) 60%,
        rgba(255,255,255,0) 100%
    );
    pointer-events: none;
    z-index: 1;
}

/* User message */
.message.user .message-content {
    background: var(--msg-user-bg);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-top-color: var(--glass-border-top);
    border-left-color: var(--glass-border-left);
    border-bottom-color: var(--glass-border-bottom);
    border-right-color: var(--glass-border-right);
    box-shadow: var(--glass-shadow);
    color: var(--text-primary);
    border-radius: 0;
}

/* Assistant message */
.message.assistant .message-content {
    background: var(--msg-assistant-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-top-color: var(--glass-border-top);
    border-left-color: var(--glass-border-left);
    border-bottom-color: var(--glass-border-bottom);
    border-right-color: var(--glass-border-right);
    box-shadow: var(--glass-shadow);
    color: var(--text-primary);
    border-radius: 0;
}

/* Message actions (copy, etc.) — shown on hover */
.message-actions {
    display: flex;
    gap: 4px;
    margin-top: 4px;
    opacity: 0;
    transform: translateY(-4px);
    transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.message:hover .message-actions {
    opacity: 1;
    transform: translateY(0);
}

.message-actions .btn-icon {
    width: 28px;
    height: 28px;
    font-size: 0.75rem;
    color: var(--text-muted);
    background: var(--glass-fill-subtle);
    border: 1px solid var(--glass-border-bottom);
}

.message-actions .btn-icon:hover {
    color: var(--accent);
    background: var(--accent-light);
}

/* Timestamp */
.message-time {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: 2px;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.message:hover .message-time {
    opacity: 1;
}


/* ── Typing Indicator ── */
.typing-indicator {
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 14px 18px;
    background: var(--msg-assistant-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid transparent;
    border-top-color: var(--glass-border-top);
    border-left-color: var(--glass-border-left);
    border-bottom-color: var(--glass-border-bottom);
    border-right-color: var(--glass-border-right);
    box-shadow: var(--glass-shadow);
    align-self: flex-start;
}

.typing-indicator span {
    width: 7px;
    height: 7px;
    background: var(--text-muted);
    border-radius: 50%;
    animation: typingPulse 1.4s ease-in-out infinite;
}

.typing-indicator span:nth-child(2) {
    animation-delay: 0.15s;
}

.typing-indicator span:nth-child(3) {
    animation-delay: 0.30s;
}

@keyframes typingPulse {
    0%, 60%, 100% {
        opacity: 0.25;
        transform: scale(0.85);
    }
    30% {
        opacity: 1;
        transform: scale(1.1);
    }
}


/* ═══════════════════════════════════════════════════════════════
   MARKDOWN CONTENT INSIDE MESSAGES
   ═══════════════════════════════════════════════════════════════ */

.message-content h1,
.message-content h2,
.message-content h3,
.message-content h4 {
    font-family: var(--font);
    font-weight: 600;
    color: var(--text-primary);
    margin: 16px 0 8px;
    line-height: 1.35;
}

.message-content h1 { font-size: 1.3rem; }
.message-content h2 { font-size: 1.15rem; }
.message-content h3 { font-size: 1.02rem; }
.message-content h4 { font-size: 0.92rem; }

.message-content h1:first-child,
.message-content h2:first-child,
.message-content h3:first-child,
.message-content h4:first-child {
    margin-top: 0;
}

.message-content p {
    margin: 8px 0;
}

.message-content p:first-child {
    margin-top: 0;
}

.message-content p:last-child {
    margin-bottom: 0;
}

.message-content a {
    color: var(--accent);
    text-decoration: none;
    border-bottom: 1px solid var(--accent-light);
    transition: color var(--transition-fast), border-color var(--transition-fast);
}

.message-content a:hover {
    color: var(--accent-dark);
    border-bottom-color: var(--accent);
}

.message-content strong {
    font-weight: 600;
    color: var(--text-primary);
}

.message-content em {
    font-style: italic;
    color: var(--text-secondary);
}

/* Inline code */
.message-content code {
    font-family: var(--font-mono);
    font-size: 0.84em;
    background: var(--code-bg);
    padding: 2px 6px;
    border: 1px solid var(--code-border);
    color: var(--code-text);
    border-radius: 0;
}

/* Code blocks */
.message-content pre {
    position: relative;
    margin: 12px 0;
    background: var(--code-bg);
    border: 1px solid var(--code-border);
    overflow: hidden;
    border-radius: 0;
}

.message-content pre code {
    display: block;
    padding: 14px 16px;
    overflow-x: auto;
    background: none;
    border: none;
    font-size: 0.82rem;
    line-height: 1.55;
    white-space: pre;
}

/* Code block header (language label) */
.message-content pre .code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 12px;
    background: var(--code-header-bg);
    border-bottom: 1px solid var(--code-border);
    font-family: var(--font);
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

/* Copy button for code blocks */
.message-content pre .copy-btn {
    position: absolute;
    top: 6px;
    right: 8px;
    padding: 3px 8px;
    background: var(--glass-fill-subtle);
    border: 1px solid var(--glass-border-bottom);
    color: var(--text-muted);
    font-family: var(--font);
    font-size: 0.7rem;
    cursor: pointer;
    opacity: 0;
    transition: opacity var(--transition-fast), color var(--transition-fast), background var(--transition-fast);
    border-radius: 0;
    z-index: 2;
}

.message-content pre:hover .copy-btn {
    opacity: 1;
}

.message-content pre .copy-btn:hover {
    background: var(--accent-light);
    color: var(--accent);
}

/* When code block has a header, push copy button down */
.message-content pre:has(.code-header) .copy-btn {
    top: auto;
    bottom: auto;
}

/* Lists */
.message-content ul,
.message-content ol {
    margin: 8px 0;
    padding-left: 22px;
}

.message-content li {
    margin: 4px 0;
    line-height: 1.55;
}

.message-content li::marker {
    color: var(--accent);
}

/* Blockquotes */
.message-content blockquote {
    margin: 12px 0;
    padding: 10px 16px;
    border-left: 3px solid var(--accent);
    background: var(--accent-light);
    color: var(--text-secondary);
    font-style: italic;
}

.message-content blockquote p {
    margin: 4px 0;
}

/* Tables */
.message-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 12px 0;
    font-size: 0.85rem;
}

.message-content th {
    padding: 8px 12px;
    background: var(--code-header-bg);
    border: 1px solid var(--code-border);
    font-weight: 600;
    text-align: left;
    color: var(--text-primary);
}

.message-content td {
    padding: 6px 12px;
    border: 1px solid var(--code-border);
    color: var(--text-secondary);
}

.message-content tr:nth-child(even) td {
    background: var(--glass-fill-subtle);
}

/* Horizontal rule */
.message-content hr {
    border: none;
    height: 1px;
    background: var(--sidebar-divider);
    margin: 16px 0;
}

/* Images in messages */
.message-content img {
    max-width: 100%;
    height: auto;
    margin: 8px 0;
}


/* ═══════════════════════════════════════════════════════════════
   INPUT AREA
   ═══════════════════════════════════════════════════════════════ */

.input-area {
    max-width: 768px;
    margin: 0 auto;
    width: 100%;
    padding: 0 16px 24px;
    position: relative;
    z-index: 5;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: flex-end;
    background: var(--glass-fill-dense);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border-bottom);
    box-shadow: 0 2px 12px rgba(100,140,200,0.08);
    overflow: visible;
    transition: box-shadow var(--transition-normal), border-color var(--transition-normal);
    border-radius: 26px;
    padding: 6px 6px 6px 6px;
    gap: 0;
}

.input-wrapper:focus-within {
    border-color: var(--glass-border-top);
    box-shadow: 0 2px 16px rgba(100,140,200,0.12);
}

/* Plus button */
.plus-menu-container {
    position: relative;
    flex-shrink: 0;
    align-self: flex-end;
    margin-bottom: 2px;
}

.plus-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 0;
    background: transparent;
    border: 1px solid var(--glass-border-bottom);
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 50%;
    transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
}

.plus-btn:hover {
    color: var(--text-primary);
    background: var(--glass-fill-subtle);
    border-color: var(--glass-border-top);
}

.plus-btn.active {
    border-color: var(--accent);
    color: var(--accent);
}

/* Plus dropdown menu */
.plus-dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    min-width: 200px;
    background: var(--glass-fill-dense);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border-top);
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.12);
    padding: 4px;
    z-index: 100;
    animation: dropdownIn 0.15s ease;
}

.plus-dropdown.visible {
    display: block;
}

@keyframes dropdownIn {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
}

.plus-dropdown-item {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 10px 14px;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 0.875rem;
    cursor: pointer;
    border-radius: 8px;
    transition: background var(--transition-fast);
    text-align: left;
}

.plus-dropdown-item:hover {
    background: var(--glass-fill-subtle);
}

.plus-dropdown-item svg {
    color: var(--text-secondary);
    flex-shrink: 0;
}

.plus-dropdown-item.active {
    color: var(--accent);
}

.plus-dropdown-item.active svg {
    color: var(--accent);
}

.input-textarea {
    flex: 1;
    padding: 14px 16px;
    background: var(--input-bg);
    border: none;
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 0.925rem;
    line-height: 1.5;
    resize: none;
    outline: none;
    min-height: 48px;
    max-height: 200px;
    position: relative;
    z-index: 2;
}

.input-textarea::placeholder {
    color: var(--input-placeholder);
}

.input-actions-old {
    display: none; /* replaced by new layout */
}

/* File chips */
.file-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    padding: 6px 14px 0;
    position: relative;
    z-index: 2;
}

.file-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    background: var(--accent-light);
    border: 1px solid var(--accent);
    color: var(--accent-dark);
    font-size: 0.78rem;
    font-weight: 500;
    border-radius: 0;
    cursor: default;
    transition: background var(--transition-fast);
}

.file-chip .file-chip-remove {
    cursor: pointer;
    opacity: 0.5;
    transition: opacity var(--transition-fast);
    font-size: 0.85rem;
    line-height: 1;
}

.file-chip .file-chip-remove:hover {
    opacity: 1;
}


/* ═══════════════════════════════════════════════════════════════
   BUTTONS
   ═══════════════════════════════════════════════════════════════ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 8px 18px;
    font-family: var(--font);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    background: var(--glass-fill);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid transparent;
    border-top-color: var(--glass-border-top);
    border-left-color: var(--glass-border-left);
    border-bottom-color: var(--glass-border-bottom);
    border-right-color: var(--glass-border-right);
    box-shadow: var(--glass-shadow);
    cursor: pointer;
    user-select: none;
    position: relative;
    overflow: hidden;
    transition: background var(--transition-normal),
                color var(--transition-normal),
                box-shadow var(--transition-normal),
                border-color var(--transition-normal);
    border-radius: 0;
}

/* Shine sweep on buttons */
.btn::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 60%;
    height: 100%;
    background: linear-gradient(
        105deg,
        rgba(255,255,255,0) 0%,
        rgba(255,255,255, var(--shine-opacity-edge)) 30%,
        rgba(255,255,255, var(--shine-opacity-mid)) 48%,
        rgba(255,255,255, var(--shine-opacity-peak)) 50%,
        rgba(255,255,255, var(--shine-opacity-mid)) 52%,
        rgba(255,255,255, var(--shine-opacity-edge)) 70%,
        rgba(255,255,255,0) 100%
    );
    pointer-events: none;
    transition: left var(--transition-shine);
    z-index: 2;
}

.btn:hover::after {
    left: 140%;
}

.btn:hover {
    background: var(--glass-fill-dense);
    box-shadow: var(--glass-shadow-hover);
}

.btn:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.btn:active {
    transform: scale(0.98);
}

/* Primary button */
.btn-primary {
    background: var(--accent);
    color: #fff;
    border-color: transparent;
    border-top-color: rgba(255,255,255,0.20);
    border-left-color: rgba(255,255,255,0.12);
    border-bottom-color: rgba(0,0,0,0.10);
    border-right-color: rgba(0,0,0,0.06);
}

.btn-primary:hover {
    background: #4da3e8;
    color: #fff;
}

/* Icon button */
.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    background: transparent;
    border: 1px solid transparent;
    box-shadow: none;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    color: var(--text-muted);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    position: relative;
    overflow: hidden;
    transition: background var(--transition-fast), color var(--transition-fast);
    border-radius: 0;
}

.btn-icon:hover {
    background: var(--glass-fill-subtle);
    color: var(--text-primary);
}

.btn-icon:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.btn-icon::after {
    display: none;
}

/* Send button */
.btn-send {
    width: 38px;
    height: 38px;
    padding: 0;
    background: var(--accent);
    color: #fff;
    border-color: transparent;
    border-top-color: rgba(255,255,255,0.20);
    border-left-color: rgba(255,255,255,0.12);
    border-bottom-color: rgba(0,0,0,0.10);
    border-right-color: rgba(0,0,0,0.06);
    box-shadow: 0 4px 16px rgba(61,143,212,0.20);
    font-size: 1rem;
    cursor: pointer;
    transition: background var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
    border-radius: 0;
}

.btn-send:hover {
    background: #4da3e8;
    box-shadow: 0 6px 24px rgba(61,143,212,0.30);
}

.btn-send:active {
    transform: scale(0.94);
}

.btn-send:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    box-shadow: none;
}

/* New chat button */
.btn-new-chat {
    padding: 6px 14px;
    font-size: 0.82rem;
}

/* Web search toggle */
.web-search-toggle {
    padding: 5px 12px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-muted);
    background: transparent;
    border: 1px solid var(--glass-border-bottom);
    box-shadow: none;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
    border-radius: 0;
    cursor: pointer;
}

.web-search-toggle:hover {
    background: var(--glass-fill-subtle);
    color: var(--text-secondary);
}

.web-search-toggle.active {
    background: var(--accent-light);
    color: var(--accent);
    border-color: var(--accent);
}

.web-search-toggle::after {
    display: none;
}


/* ═══════════════════════════════════════════════════════════════
   EMPTY STATE
   ═══════════════════════════════════════════════════════════════ */

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0 20px 8px;
    text-align: center;
}

.empty-state h1 {
    font-family: var(--font-heading);
    font-size: 2.8rem;
    color: var(--text-primary);
    margin-bottom: 8px;
    letter-spacing: -0.01em;
    font-weight: 400;
}

.empty-state p {
    color: var(--text-muted);
    font-size: 1rem;
    margin-bottom: 36px;
    max-width: 400px;
}

.suggestion-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 200px));
    gap: 10px;
    max-width: 520px;
    width: 100%;
}

.suggestion-card {
    position: relative;
    padding: 12px 14px;
    background: var(--glass-fill);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid transparent;
    border-top-color: var(--glass-border-top);
    border-left-color: var(--glass-border-left);
    border-bottom-color: var(--glass-border-bottom);
    border-right-color: var(--glass-border-right);
    box-shadow: var(--glass-shadow);
    cursor: pointer;
    text-align: left;
    overflow: hidden;
    transition: background var(--transition-normal),
                box-shadow var(--transition-normal),
                border-color var(--transition-normal);
    border-radius: 0;
}

/* Static sheen */
.suggestion-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        120deg,
        rgba(255,255,255,0) 0%,
        rgba(255,255,255,0.06) 40%,
        rgba(255,255,255,0.12) 50%,
        rgba(255,255,255,0.06) 60%,
        rgba(255,255,255,0) 100%
    );
    pointer-events: none;
    z-index: 1;
}

/* Shine sweep */
.suggestion-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 60%;
    height: 100%;
    background: linear-gradient(
        105deg,
        rgba(255,255,255,0) 0%,
        rgba(255,255,255, var(--shine-opacity-edge)) 30%,
        rgba(255,255,255, var(--shine-opacity-mid)) 48%,
        rgba(255,255,255, var(--shine-opacity-peak)) 50%,
        rgba(255,255,255, var(--shine-opacity-mid)) 52%,
        rgba(255,255,255, var(--shine-opacity-edge)) 70%,
        rgba(255,255,255,0) 100%
    );
    pointer-events: none;
    transition: left var(--transition-shine);
    z-index: 2;
}

.suggestion-card:hover::after {
    left: 140%;
}

.suggestion-card:hover {
    background: var(--glass-fill-dense);
    border-top-color: rgba(255,255,255,0.55);
    border-left-color: rgba(255,255,255,0.45);
    box-shadow: var(--glass-shadow-hover);
}

.suggestion-card .suggestion-icon {
    font-size: 1.3rem;
    margin-bottom: 8px;
    display: block;
}

.suggestion-card .suggestion-title {
    font-weight: 500;
    font-size: 0.88rem;
    color: var(--text-primary);
    margin-bottom: 3px;
}

.suggestion-card .suggestion-desc {
    font-size: 0.78rem;
    color: var(--text-muted);
    line-height: 1.4;
}


/* ═══════════════════════════════════════════════════════════════
   SETTINGS MODAL
   ═══════════════════════════════════════════════════════════════ */

.settings-overlay {
    position: fixed;
    inset: 0;
    background: var(--overlay-bg);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.settings-overlay.open {
    opacity: 1;
    visibility: visible;
}

.settings-modal {
    width: 90%;
    max-width: 520px;
    max-height: 85vh;
    overflow-y: auto;
    background: var(--glass-fill-dense);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid transparent;
    border-top-color: var(--glass-border-top);
    border-left-color: var(--glass-border-left);
    border-bottom-color: var(--glass-border-bottom);
    border-right-color: var(--glass-border-right);
    box-shadow: 0 24px 80px rgba(0,0,0,0.15), var(--glass-shadow);
    padding: 28px 28px 24px;
    position: relative;
    transform: translateY(20px) scale(0.97);
    transition: transform var(--transition-smooth);
    border-radius: 0;
}

.settings-overlay.open .settings-modal {
    transform: translateY(0) scale(1);
}

/* Sheen on modal */
.settings-modal::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        120deg,
        rgba(255,255,255,0) 0%,
        rgba(255,255,255,0.04) 40%,
        rgba(255,255,255,0.08) 50%,
        rgba(255,255,255,0.04) 60%,
        rgba(255,255,255,0) 100%
    );
    pointer-events: none;
    z-index: 0;
}

.settings-modal h2 {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    color: var(--text-primary);
    margin-bottom: 20px;
    position: relative;
    z-index: 1;
}

.settings-modal .close-btn {
    position: absolute;
    top: 16px;
    right: 16px;
    z-index: 2;
}

.settings-field {
    margin-bottom: 18px;
    position: relative;
    z-index: 1;
}

.settings-field label {
    display: block;
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 6px;
    letter-spacing: 0.01em;
}

.settings-field input,
.settings-field select,
.settings-field textarea {
    width: 100%;
    padding: 10px 14px;
    background: var(--glass-fill-subtle);
    border: 1px solid var(--glass-border-bottom);
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 0.875rem;
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    border-radius: 0;
}

.settings-field input:focus,
.settings-field select:focus,
.settings-field textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-light);
}

.settings-field select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238694ab' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

.settings-field .field-hint {
    font-size: 0.73rem;
    color: var(--text-muted);
    margin-top: 4px;
}

/* Toggle switch */
.settings-field .toggle-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.toggle-switch {
    position: relative;
    width: 42px;
    height: 22px;
    background: var(--glass-fill-subtle);
    border: 1px solid var(--glass-border-bottom);
    cursor: pointer;
    transition: background var(--transition-fast), border-color var(--transition-fast);
    border-radius: 0;
}

.toggle-switch.active {
    background: var(--accent);
    border-color: var(--accent-dark);
}

.toggle-switch::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 16px;
    height: 16px;
    background: #fff;
    transition: transform var(--transition-fast);
    border-radius: 0;
}

.toggle-switch.active::after {
    transform: translateX(20px);
}


/* ═══════════════════════════════════════════════════════════════
   MOBILE NAVIGATION
   ═══════════════════════════════════════════════════════════════ */

.mobile-menu-btn {
    display: none;
    width: 40px;
    height: 40px;
    padding: 0;
    background: transparent;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    border-radius: 0;
}

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: var(--overlay-bg);
    z-index: 9;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.sidebar-overlay.visible {
    opacity: 1;
}


/* ═══════════════════════════════════════════════════════════════
   RESPONSIVE — TABLET (< 1024px)
   ═══════════════════════════════════════════════════════════════ */

@media (max-width: 1024px) {
    .sidebar {
        width: 240px;
        min-width: 240px;
    }

    .message {
        max-width: 85%;
    }
}


/* ═══════════════════════════════════════════════════════════════
   RESPONSIVE — MOBILE (< 768px)
   ═══════════════════════════════════════════════════════════════ */

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: inline-flex;
    }

    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        width: 300px;
        min-width: 300px;
        z-index: 20;
        transform: translateX(-100%);
        transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar-overlay {
        display: block;
    }

    .message {
        max-width: 92%;
    }

    .top-bar {
        padding: 10px 14px;
    }

    .chat-messages {
        padding: 16px 12px;
        gap: 12px;
    }

    .input-area {
        padding: 0 12px 16px;
    }

    .input-textarea {
        padding: 12px 8px 12px 0;
        font-size: 1rem; /* Prevent iOS zoom */
    }

    .empty-state h1 {
        font-size: 2rem;
    }

    .suggestion-grid {
        grid-template-columns: 1fr 1fr;
        gap: 8px;
    }

    .suggestion-card {
        padding: 12px 14px;
    }

    .settings-modal {
        width: 95%;
        max-height: 90vh;
        padding: 20px 18px;
    }

    /* Larger touch targets */
    .btn-icon {
        width: 42px;
        height: 42px;
    }

    .btn-send {
        width: 44px;
        height: 44px;
    }

    .conversation-item {
        padding: 12px 16px;
        min-height: 44px;
    }
}


/* ═══════════════════════════════════════════════════════════════
   RESPONSIVE — SMALL MOBILE (< 480px)
   ═══════════════════════════════════════════════════════════════ */

@media (max-width: 480px) {
    .suggestion-grid {
        grid-template-columns: 1fr;
    }

    .empty-state h1 {
        font-size: 1.7rem;
    }

    .empty-state p {
        font-size: 0.9rem;
    }

    .message-content {
        padding: 10px 14px;
        font-size: 0.9rem;
    }
}


/* ═══════════════════════════════════════════════════════════════
   ACCESSIBILITY
   ═══════════════════════════════════════════════════════════════ */

/* Focus visible for keyboard navigation */
*:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Remove focus for mouse clicks */
*:focus:not(:focus-visible) {
    outline: none;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}


/* ═══════════════════════════════════════════════════════════════
   UTILITIES
   ═══════════════════════════════════════════════════════════════ */

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.truncate {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.gap-xs { gap: 4px; }
.gap-sm { gap: 8px; }
.gap-md { gap: 12px; }
.gap-lg { gap: 20px; }


/* ═══════════════════════════════════════════════════════════════
   HTML/JS CLASS ALIGNMENT
   These rules map HTML class names to their CSS styles
   ═══════════════════════════════════════════════════════════════ */

/* Hidden utility (used by JS) */
.hidden {
    display: none !important;
}

/* Sidebar logo text (HTML uses .sidebar-logo, CSS had .sidebar-header .logo) */
.sidebar-logo {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    color: var(--text-primary);
    letter-spacing: 0.01em;
    user-select: none;
}

/* New chat button (HTML uses .new-chat-btn) */
.new-chat-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin: 8px 12px;
    padding: 8px 14px;
    font-family: var(--font);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-primary);
    background: var(--glass-fill);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid transparent;
    border-top-color: var(--glass-border-top);
    border-left-color: var(--glass-border-left);
    border-bottom-color: var(--glass-border-bottom);
    border-right-color: var(--glass-border-right);
    box-shadow: var(--glass-shadow);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: background var(--transition-normal), box-shadow var(--transition-normal);
    border-radius: 0;
}

.new-chat-btn:hover {
    background: var(--glass-fill-dense);
    box-shadow: var(--glass-shadow-hover);
}

/* Shine sweep on new chat button */
.new-chat-btn::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 60%;
    height: 100%;
    background: linear-gradient(
        105deg,
        rgba(255,255,255,0) 0%,
        rgba(255,255,255, var(--shine-opacity-edge)) 30%,
        rgba(255,255,255, var(--shine-opacity-mid)) 48%,
        rgba(255,255,255, var(--shine-opacity-peak)) 50%,
        rgba(255,255,255, var(--shine-opacity-mid)) 52%,
        rgba(255,255,255, var(--shine-opacity-edge)) 70%,
        rgba(255,255,255,0) 100%
    );
    pointer-events: none;
    transition: left var(--transition-shine);
    z-index: 2;
}

.new-chat-btn:hover::after {
    left: 140%;
}

/* Search icon in sidebar */
.search-icon {
    position: absolute;
    left: 22px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
}

.sidebar-search {
    position: relative;
    padding: 8px 12px;
}

.search-input {
    width: 100%;
    padding: 8px 12px 8px 32px;
    background: var(--glass-fill-subtle);
    border: 1px solid var(--glass-border-bottom);
    border-radius: 0;
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 0.85rem;
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-input::placeholder {
    color: var(--text-muted);
}

.search-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-light);
}

/* Conversation list container (HTML uses .conversation-list) */
.conversation-list {
    flex: 1;
    overflow-y: auto;
    padding: 4px 0;
}

/* Conversation group label (pinned) */
.conversation-group-label {
    padding: 8px 16px 4px;
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

/* Conversation group divider */
.conversation-group-divider {
    height: 1px;
    margin: 4px 16px;
    background: var(--sidebar-divider);
}

/* Conversation item info layout */
.conversation-item-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    gap: 2px;
}

.conversation-item-title {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-size: 0.875rem;
    color: inherit;
}

.conversation-item-date {
    font-size: 0.72rem;
    color: var(--text-muted);
    white-space: nowrap;
}

/* Conversation item actions */
.conversation-item-actions {
    display: flex;
    align-items: center;
    gap: 4px;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.conversation-item:hover .conversation-item-actions {
    opacity: 1;
}

.conversation-pin-icon {
    color: var(--accent);
    display: flex;
    align-items: center;
    opacity: 0.6;
}

.conversation-delete-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    padding: 0;
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: 0;
    transition: color var(--transition-fast), background var(--transition-fast);
}

.conversation-delete-btn:hover {
    color: #e74c3c;
    background: rgba(231,76,60,0.08);
}

/* Settings button */
.settings-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 0;
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: 0;
    transition: color var(--transition-fast);
}

.settings-btn:hover {
    color: var(--text-primary);
}

/* chat-main (HTML uses this instead of main-content) */
.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    position: relative;
}

/* When empty state is visible, center everything vertically */

/* Hamburger button */
.hamburger-btn {
    display: none;
    width: 40px;
    height: 40px;
    padding: 0;
    background: transparent;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    align-items: center;
    justify-content: center;
    border-radius: 0;
}

/* Conversation title in top bar (HTML uses .conversation-title) */
.conversation-title {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-primary);
    flex: 1;
    text-align: left;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    padding: 0 8px;
    outline: none;
    cursor: default;
}

.conversation-title[contenteditable="true"] {
    cursor: text;
    background: var(--glass-fill-subtle);
    padding: 2px 8px;
}

/* Pin button */
.pin-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 0;
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: 0;
    transition: color var(--transition-fast);
}

.pin-btn:hover {
    color: var(--text-primary);
}

.pin-btn.pinned {
    color: var(--accent);
}

/* Messages area (HTML uses .messages-area) */
.messages-area {
    flex: 1;
    overflow-y: auto;
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    gap: 0;
    align-items: center;
}

/* When empty state is visible, position content ~40% from top (ChatGPT style) */
.chat-main:has(.empty-state:not(.hidden)) .messages-area {
    flex: none;
    padding-top: 30vh;
}

/* Empty state heading and tagline classes from HTML */
.empty-state-heading {
    font-family: var(--font-heading);
    font-size: 2.8rem;
    color: var(--text-primary);
    margin-bottom: 8px;
    letter-spacing: -0.01em;
    font-weight: 400;
}

.empty-state-tagline {
    color: var(--text-muted);
    font-size: 1rem;
    margin-bottom: 0;
    max-width: 400px;
}

/* Suggestion text (HTML uses .suggestion-text, CSS had .suggestion-desc) */
.suggestion-text {
    font-size: 0.78rem;
    color: var(--text-muted);
    line-height: 1.4;
    display: block;
}

/* ── Message Bubbles — ChatGPT style ── */
.message-bubble {
    display: flex;
    flex-direction: column;
    max-width: 768px;
    width: 100%;
    position: relative;
    padding: 16px 0;
}

.message-bubble + .message-bubble {
    padding-top: 16px;
}

/* User: right-aligned rounded bubble */
.message-bubble.message-user {
    align-items: flex-end;
}

.message-bubble.message-user .message-content {
    background: var(--glass-fill-dense, rgba(100,140,200,0.08));
    border: none;
    box-shadow: none;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    color: var(--text-primary);
    border-radius: 20px;
    padding: 10px 16px;
    max-width: 85%;
    width: auto;
    font-size: 0.925rem;
    line-height: 1.6;
}

/* Assistant: left-aligned, no background, full width */
.message-bubble.message-assistant {
    align-items: flex-start;
}

.message-bubble.message-assistant .message-content {
    background: transparent;
    border: none;
    box-shadow: none;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    color: var(--text-primary);
    border-radius: 0;
    padding: 0;
    max-width: 100%;
    font-size: 0.925rem;
    line-height: 1.7;
}

/* Kill the glass sheen pseudo-element */
.message-bubble .message-content::before {
    display: none;
}

/* Timestamp */
.message-timestamp {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: 4px;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.message-bubble:hover .message-timestamp {
    opacity: 1;
}

/* Copy button — bottom-left under assistant messages */
.message-copy-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    padding: 0;
    margin-top: 4px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: 6px;
    opacity: 0;
    transition: opacity var(--transition-fast), color var(--transition-fast), background var(--transition-fast);
}

.message-bubble:hover .message-copy-btn {
    opacity: 1;
}

.message-copy-btn:hover {
    color: var(--text-primary);
    background: var(--glass-fill-subtle, rgba(100,140,200,0.06));
}

.message-copy-btn.copied {
    color: #22c55e;
}

/* Message file attachments */
.message-files {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 6px;
}

.message-file-chip {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 8px;
    background: var(--accent-light);
    border: 1px solid var(--accent);
    color: var(--accent-dark);
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: 0;
}

/* Message input (HTML uses .message-input) */
.message-input {
    flex: 1;
    padding: 8px 8px 8px 10px;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 0.95rem;
    line-height: 1.5;
    resize: none;
    outline: none;
    min-height: 24px;
    max-height: 200px;
    align-self: center;
}

.message-input::placeholder {
    color: var(--input-placeholder);
}

/* Hidden file input */
.file-input-hidden {
    display: none;
}

/* Send button — circular, right side */
.send-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    flex-shrink: 0;
    padding: 0;
    background: var(--text-primary);
    color: var(--bg-top);
    border: none;
    box-shadow: none;
    cursor: pointer;
    transition: background var(--transition-fast), opacity var(--transition-fast), transform var(--transition-fast);
    border-radius: 50%;
    align-self: flex-end;
    margin-bottom: 2px;
}

.send-btn:hover:not(:disabled) {
    opacity: 0.8;
}

.send-btn:active:not(:disabled) {
    transform: scale(0.94);
}

.send-btn:disabled {
    background: var(--text-muted);
    opacity: 0.3;
    cursor: not-allowed;
}

/* Attached files area */
.attached-files {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    padding: 6px 14px 0;
}

.attached-file-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    background: var(--accent-light);
    border: 1px solid var(--accent);
    color: var(--accent-dark);
    font-size: 0.78rem;
    font-weight: 500;
    border-radius: 0;
}

.attached-file-name {
    max-width: 150px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.attached-file-remove {
    cursor: pointer;
    background: none;
    border: none;
    color: inherit;
    font-size: 1rem;
    line-height: 1;
    padding: 0;
    opacity: 0.5;
    transition: opacity var(--transition-fast);
}

.attached-file-remove:hover {
    opacity: 1;
}

/* Typing indicator — inside messages-area, left-aligned like assistant text */
.typing-indicator {
    display: none;
    align-items: center;
    gap: 5px;
    padding: 16px 0;
    max-width: 768px;
    width: 100%;
}

.typing-indicator.visible {
    display: flex;
}

.typing-dot {
    width: 7px;
    height: 7px;
    background: var(--text-muted);
    border-radius: 50%;
    animation: typingPulse 1.4s ease-in-out infinite;
}

.typing-dot:nth-child(2) {
    animation-delay: 0.15s;
}

.typing-dot:nth-child(3) {
    animation-delay: 0.30s;
}

/* Modal overlay (HTML uses .modal-overlay, CSS had .settings-overlay) */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: var(--overlay-bg);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.modal-overlay.visible {
    opacity: 1;
    visibility: visible;
}

.modal-overlay.visible .settings-modal,
.modal-overlay.visible .confirm-dialog {
    transform: translateY(0) scale(1);
}

/* Settings header */
.settings-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    position: relative;
    z-index: 1;
}

.settings-title {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    color: var(--text-primary);
}

.settings-close-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    padding: 0;
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: 0;
    transition: color var(--transition-fast);
}

.settings-close-btn:hover {
    color: var(--text-primary);
}

/* Settings body */
.settings-body {
    position: relative;
    z-index: 1;
}

.settings-group {
    margin-bottom: 18px;
}

.settings-label {
    display: block;
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 6px;
    letter-spacing: 0.01em;
}

.settings-textarea {
    width: 100%;
    min-height: 100px;
    padding: 10px 14px;
    background: var(--glass-fill-subtle);
    border: 1px solid var(--glass-border-bottom);
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 0.875rem;
    outline: none;
    resize: vertical;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    border-radius: 0;
}

.settings-textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-light);
}

.settings-input {
    flex: 1;
    padding: 8px 12px;
    background: var(--glass-fill-subtle);
    border: 1px solid var(--glass-border-bottom);
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 0.875rem;
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    border-radius: 0;
}

.settings-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-light);
}

.admin-login-row {
    display: flex;
    gap: 8px;
}

.admin-login-btn {
    padding: 8px 16px;
    background: var(--accent);
    color: #fff;
    border: none;
    font-family: var(--font);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: 0;
    transition: background var(--transition-fast);
}

.admin-login-btn:hover {
    background: #4da3e8;
}

.admin-status {
    font-size: 0.78rem;
    margin-top: 6px;
}

.admin-status.success {
    color: #22c55e;
}

.admin-status.error {
    color: #e74c3c;
}

/* Danger zone */
.settings-danger-zone {
    padding-top: 12px;
    border-top: 1px solid var(--sidebar-divider);
}

.danger-btn {
    padding: 8px 16px;
    background: rgba(231,76,60,0.08);
    color: #e74c3c;
    border: 1px solid rgba(231,76,60,0.3);
    font-family: var(--font);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: 0;
    transition: background var(--transition-fast), border-color var(--transition-fast);
}

.danger-btn:hover {
    background: rgba(231,76,60,0.15);
    border-color: rgba(231,76,60,0.5);
}

/* Confirm dialog */
.confirm-dialog {
    background: var(--glass-fill-dense);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid transparent;
    border-top-color: var(--glass-border-top);
    border-left-color: var(--glass-border-left);
    border-bottom-color: var(--glass-border-bottom);
    border-right-color: var(--glass-border-right);
    box-shadow: 0 24px 80px rgba(0,0,0,0.15), var(--glass-shadow);
    padding: 24px;
    max-width: 400px;
    width: 90%;
    transform: translateY(20px) scale(0.97);
    transition: transform var(--transition-smooth);
    border-radius: 0;
}

.confirm-message {
    font-size: 0.95rem;
    color: var(--text-primary);
    margin-bottom: 20px;
    line-height: 1.5;
}

.confirm-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

.confirm-cancel-btn {
    padding: 8px 16px;
    background: var(--glass-fill-subtle);
    color: var(--text-secondary);
    border: 1px solid var(--glass-border-bottom);
    font-family: var(--font);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: 0;
    transition: background var(--transition-fast), color var(--transition-fast);
}

.confirm-cancel-btn:hover {
    background: var(--glass-fill);
    color: var(--text-primary);
}

.confirm-ok-btn {
    padding: 8px 16px;
    background: #e74c3c;
    color: #fff;
    border: none;
    font-family: var(--font);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: 0;
    transition: background var(--transition-fast);
}

.confirm-ok-btn:hover {
    background: #c0392b;
}

/* ═══════════════════════════════════════════════════════════════
   HAMBURGER MENU & NAV SIDEBAR
   ═══════════════════════════════════════════════════════════════ */

.hamburger-menu-btn {
    position: fixed;
    top: 16px;
    right: 16px;
    z-index: 50;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    padding: 0;
    background: var(--glass-fill);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border-bottom);
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 10px;
    transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
}

.hamburger-menu-btn:hover {
    color: var(--text-primary);
    background: var(--glass-fill-dense);
    border-color: var(--glass-border-top);
}

/* Overlay */
.nav-sidebar-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.3);
    z-index: 90;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal);
}

.nav-sidebar-overlay.visible {
    opacity: 1;
    pointer-events: auto;
}

/* Sidebar panel */
.nav-sidebar {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 280px;
    max-width: 85vw;
    background: var(--glass-fill-dense);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-left: 1px solid var(--glass-border-left);
    box-shadow: -8px 0 32px rgba(0,0,0,0.10);
    z-index: 100;
    display: flex;
    flex-direction: column;
    transform: translateX(100%);
    transition: transform var(--transition-smooth);
}

.nav-sidebar.open {
    transform: translateX(0);
}

.nav-sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--glass-border-bottom);
}

.nav-sidebar-title {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    color: var(--text-primary);
}

.nav-sidebar-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 0;
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: 8px;
    transition: color var(--transition-fast), background var(--transition-fast);
}

.nav-sidebar-close:hover {
    color: var(--text-primary);
    background: var(--glass-fill-subtle);
}

.nav-sidebar-links {
    flex: 1;
    padding: 8px 12px;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.nav-sidebar-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 0.9rem;
    cursor: pointer;
    border-radius: 8px;
    transition: background var(--transition-fast);
    text-decoration: none;
    width: 100%;
    text-align: left;
}

.nav-sidebar-item:hover {
    background: var(--glass-fill-subtle);
}

.nav-sidebar-item svg {
    color: var(--text-secondary);
    flex-shrink: 0;
}

.nav-sidebar-footer {
    padding: 12px;
    border-top: 1px solid var(--glass-border-bottom);
}

.theme-toggle-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 12px 14px;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 0.9rem;
    cursor: pointer;
    border-radius: 8px;
    transition: background var(--transition-fast);
}

.theme-toggle-btn:hover {
    background: var(--glass-fill-subtle);
}

.theme-toggle-btn svg {
    color: var(--text-secondary);
    flex-shrink: 0;
}

/* Show sun in dark mode, moon in light mode */
html.light .theme-icon-sun { display: none; }
html.light .theme-icon-moon { display: block; }
html.dark .theme-icon-sun { display: block; }
html.dark .theme-icon-moon { display: none; }

html.dark .hamburger-menu-btn {
    background: #111111;
    border-color: #222222;
}

html.dark .nav-sidebar {
    background: #111111;
    border-left-color: #222222;
}

html.dark .nav-sidebar-header {
    border-bottom-color: #222222;
}

html.dark .nav-sidebar-footer {
    border-top-color: #222222;
}

/* Mobile responsive for new classes */
@media (max-width: 768px) {
    .hamburger-btn {
        display: inline-flex;
    }

    .messages-area {
        padding: 16px 12px;
        gap: 0;
    }

    .message-bubble {
        max-width: 100%;
    }

    .message-input {
        font-size: 1rem;
    }

    .empty-state-heading {
        font-size: 2rem;
    }

    .plus-dropdown {
        min-width: 180px;
    }
}

@media (max-width: 480px) {
    .empty-state-heading {
        font-size: 1.7rem;
    }

    .empty-state-tagline {
        font-size: 0.9rem;
    }
}