/* ========================================
   OpenCompletion - Unified Design System
   Single CSS file for all pages
   ======================================== */

/* CSS Variables for Light and Dark Themes */
:root {
    /* Background Colors */
    --bg-primary: #f5f5f7;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f8f9fa;
    --bg-code: #f0f0f0;
    --bg-hover: #e8e8ea;

    /* Text Colors */
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --text-muted: #86868b;
    --text-info: #0066cc;
    --text-success: #008800;
    --text-error: #cc0000;

    /* Link Colors */
    --link-color: #0066cc;
    --link-hover: #004499;

    /* Border Colors */
    --border-color: #d2d2d7;
    --border-color-dark: #c8c8cc;
    --border-code: #ccc;

    /* Button Colors */
    --button-primary: #0071e3;
    --button-primary-hover: #0051b3;
    --button-success: #28a745;
    --button-success-hover: #218838;
    --button-activity: #4CAF50;
    --button-danger: #dc3545;
    --button-secondary: #6c757d;
    --button-secondary-hover: #5a6268;

    /* Gradient (purple/blue theme) */
    --gradient-start: #667eea;
    --gradient-end: #764ba2;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-hover: 0 6px 20px rgba(0, 0, 0, 0.15);

    /* Other */
    --highlight-bg: #f8f9fa;
    --code-line-numbers: #999;
    --modal-overlay: rgba(0, 0, 0, 0.5);

    /* Spacing Scale (4px base) */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
}

[data-theme="dark"] {
    /* Background Colors */
    --bg-primary: #000000;
    --bg-secondary: #1d1d1f;
    --bg-tertiary: #2d2d2f;
    --bg-code: #161618;
    --bg-hover: #2d2d2f;

    /* Text Colors */
    --text-primary: #f5f5f7;
    --text-secondary: #a1a1a6;
    --text-muted: #86868b;
    --text-info: #4da3ff;
    --text-success: #5fcc5f;
    --text-error: #ff6b6b;

    /* Link Colors */
    --link-color: #2997ff;
    --link-hover: #5fb1ff;

    /* Border Colors */
    --border-color: #424245;
    --border-color-dark: #535356;
    --border-code: #555;

    /* Button Colors */
    --button-primary: #0a84ff;
    --button-primary-hover: #409cff;
    --button-success: #30d158;
    --button-success-hover: #5fcc5f;
    --button-activity: #4CAF50;
    --button-danger: #ff453a;
    --button-secondary: #6c757d;
    --button-secondary-hover: #8a9199;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.6);
    --shadow-hover: 0 6px 20px rgba(0, 0, 0, 0.7);

    /* Other */
    --highlight-bg: #2a2a2c;
    --code-line-numbers: #666;
    --modal-overlay: rgba(0, 0, 0, 0.75);
}

/* Dark theme code block overrides */
[data-theme="dark"] .hljs {
    color: #e0e0e0;
}

[data-theme="dark"] pre,
[data-theme="dark"] code {
    background-color: var(--bg-code);
    color: var(--text-primary);
}

/* ========================================
   TYPOGRAPHY SYSTEM
   ======================================== */

html, body {
    /* Typography */
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;
    font-size: 14px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;

    /* Layout & Colors */
    height: 100%;
    margin: 0;
    padding: 0;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    overflow: hidden;
    transition: background-color 0.2s ease, color 0.2s ease;
}

h1 { font-size: 32px; font-weight: 600; line-height: 1.2; margin: 0 0 var(--space-4) 0; }
h2 { font-size: 24px; font-weight: 600; line-height: 1.3; margin: 0 0 var(--space-3) 0; }
h3 { font-size: 18px; font-weight: 600; line-height: 1.4; margin: 0 0 var(--space-3) 0; }
h4 { font-size: 16px; font-weight: 600; line-height: 1.4; margin: 0 0 var(--space-2) 0; }
h5 { font-size: 14px; font-weight: 600; line-height: 1.4; margin: 0 0 var(--space-2) 0; }

p {
    margin: 0 0 var(--space-3) 0;
}

/* ========================================
   BASE LAYOUT
   ======================================== */

/* Main container for chat interface (3-column grid) */
.main-container {
    display: grid;
    grid-template-columns: 240px 1fr 280px;
    width: 100%;
    height: 100vh;
    gap: 0;
}

/* ========================================
   CHAT PAGE LAYOUT (STAR OF THE SHOW!)
   ======================================== */

/* Left sidebar - rooms list */
#rooms-list {
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    padding: var(--space-3);
    background-color: var(--bg-secondary);
    transition: background-color 0.2s ease, border-color 0.2s ease;
    display: grid;
    grid-auto-rows: max-content;
    gap: var(--space-3);
}

/* Site header in sidebar */
#site-header {
    text-align: center;
    padding-bottom: var(--space-3);
    border-bottom: 1px solid var(--border-color);
}

#opencompletion-btn {
    width: 100%;
    padding: var(--space-2) var(--space-3);
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: var(--shadow-sm);
}

#opencompletion-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* New room section */
#new-room-section {
    padding: var(--space-3);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-tertiary);
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

#new-room-section h4 {
    margin: 0 0 var(--space-2) 0;
    font-size: 13px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

#new-room-name {
    width: 100%;
    padding: var(--space-2);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 13px;
    margin-bottom: var(--space-2);
    box-sizing: border-box;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    transition: border-color 0.2s ease;
}

#new-room-name:focus {
    outline: none;
    border-color: var(--button-primary);
}

#create-room-btn {
    width: 100%;
    padding: var(--space-2);
    background-color: var(--button-success);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

#create-room-btn:hover {
    background-color: var(--button-success-hover);
}

/* Room tabs */
#room-tabs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: var(--space-3);
}

.room-tab {
    padding: var(--space-2);
    text-align: center;
    cursor: pointer;
    background-color: transparent;
    color: var(--text-secondary);
    border: none;
    border-bottom: 2px solid transparent;
    transition: all 0.2s ease;
    font-size: 13px;
    font-weight: 500;
}

.room-tab:hover {
    color: var(--text-primary);
    background-color: var(--bg-hover);
}

.room-tab.active {
    color: var(--text-primary);
    border-bottom-color: var(--button-primary);
    font-weight: 600;
}

/* Room list */
#rooms-list ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

#rooms-list li {
    margin-bottom: var(--space-2);
    padding: var(--space-2);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background-color: var(--bg-secondary);
    transition: all 0.2s ease;
}

#rooms-list li:hover {
    background-color: var(--bg-hover);
    border-color: var(--button-primary);
    transform: translateX(2px);
}

#rooms-list a {
    color: var(--link-color);
    text-decoration: none;
    font-size: 13px;
}

#rooms-list a:hover {
    color: var(--link-hover);
}

/* Center - chat container */
#chat-container {
    display: grid;
    grid-template-rows: auto 1fr auto;
    height: 100vh;
    background-color: var(--bg-secondary);
    padding: var(--space-4);
    box-sizing: border-box;
    transition: background-color 0.2s ease;
    overflow-x: hidden;
}

/* Search bar at top of chat */
#search-form {
    margin-bottom: var(--space-3);
}

#search-keywords {
    width: 100%;
    padding: var(--space-2) var(--space-3);
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 14px;
    transition: all 0.2s ease;
    box-sizing: border-box;
}

#search-keywords:focus {
    outline: none;
    border-color: var(--button-primary);
    background-color: var(--bg-secondary);
}

/* Chat messages area */
#chat {
    overflow-y: auto;
    overflow-x: hidden;
    padding: var(--space-3);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

/* Message wrapper */
.message-wrapper {
    display: grid;
    grid-template-columns: auto 1fr;
    align-items: start;
    gap: var(--space-2);
    margin-bottom: var(--space-6);
    min-width: 0;
}

.button-container {
    display: grid;
    gap: var(--space-1);
}

.message-body {
    width: 100%;
    display: grid;
    overflow-wrap: break-word;
    word-wrap: break-word;
    word-break: break-word;
    min-width: 0;
}

.message-header {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--space-1);
}

.message-content {
    width: 100%;
    font-size: 14px;
    line-height: 1.6;
    overflow-wrap: break-word;
    word-wrap: break-word;
    word-break: break-word;
    min-width: 0;
}

/* Message input area */
#message-form {
    margin-top: var(--space-3);
    display: flex;
    gap: var(--space-2);
    align-items: flex-end;
}

#send-button {
    padding: var(--space-2) var(--space-4);
    background-color: var(--button-primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 14px;
    min-height: 60px;
    white-space: nowrap;
}

#send-button:hover {
    opacity: 0.9;
}

#message, .message-edit {
    width: 100%;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--space-3);
    display: block;
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    transition: all 0.2s ease;
    min-height: 60px;
    max-height: 200px;
    overflow-y: auto;
    resize: none;
    box-sizing: border-box;
    font-family: inherit;
    font-size: 14px;
    line-height: 1.5;
}

#message:focus, .message-edit:focus {
    outline: none;
    border-color: var(--button-primary);
    background-color: var(--bg-secondary);
}

/* Right sidebar - utility belt */
.utility-belt {
    padding: var(--space-4);
    background-color: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
    overflow-y: auto;
    transition: background-color 0.2s ease;
}

.utility-belt h3 {
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    margin-bottom: var(--space-3);
}

.utility-belt label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--space-1);
}

/* Dropdowns in utility belt */
#model-select, #voice-select, #activity-select,
#model-select-mobile, #voice-select-mobile {
    width: 100%;
    padding: var(--space-2);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 13px;
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    margin-bottom: var(--space-3);
    cursor: pointer;
    transition: all 0.2s ease;
}

#model-select:focus, #voice-select:focus, #activity-select:focus {
    outline: none;
    border-color: var(--button-primary);
}

/* Username input */
#username-input, #username-input-mobile {
    width: 100%;
    padding: var(--space-2);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    font-size: 13px;
    margin-bottom: var(--space-3);
    transition: all 0.2s ease;
}

#username-input:focus, #username-input-mobile:focus {
    outline: none;
    border-color: var(--button-primary);
}

/* Theme toggle button */
#theme-toggle-btn, #theme-toggle-btn-mobile {
    width: 100%;
    padding: var(--space-2);
    background-color: var(--button-secondary);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    margin-bottom: var(--space-3);
    transition: background-color 0.2s ease;
}

#theme-toggle-btn:hover, #theme-toggle-btn-mobile:hover {
    background-color: var(--button-secondary-hover);
}

/* Activity controls */
#activity-controls {
    margin-top: var(--space-4);
    padding-top: var(--space-4);
    border-top: 1px solid var(--border-color);
}

#activity-controls h3 {
    margin-bottom: var(--space-3);
}

#current-activity-info {
    background-color: var(--bg-tertiary);
    padding: var(--space-3);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-3);
    font-size: 12px;
}

#current-activity-info p {
    margin: 0 0 var(--space-1) 0;
    color: var(--text-secondary);
}

#activity-controls button {
    width: 100%;
    padding: var(--space-2);
    background-color: var(--button-activity);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    margin-bottom: var(--space-2);
    transition: opacity 0.2s ease;
}

#activity-controls button:hover {
    opacity: 0.9;
}

#cancel-activity-btn {
    background-color: var(--button-danger);
}

/* User lists */
#user-lists, #user-lists-mobile {
    margin-top: var(--space-4);
}

#user-lists h3, #user-lists-mobile h3 {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--space-2);
}

#user-lists ul, #user-lists-mobile ul {
    list-style: none;
    padding: 0;
    margin: 0 0 var(--space-3) 0;
    font-size: 12px;
}

#user-lists li, #user-lists-mobile li {
    padding: var(--space-1) 0;
    color: var(--text-secondary);
}

/* ========================================
   CODE BLOCKS
   ======================================== */

.hljs {
    position: relative;
    padding: var(--space-4) !important;
    padding-left: 56px !important;
    counter-reset: line;
    background-color: var(--bg-code) !important;
    border-radius: var(--radius-md);
    font-size: 13px;
    line-height: 1.6;
    overflow-x: auto;
    transition: background-color 0.2s ease;
}

.hljs .line-numbers-rows {
    position: absolute;
    top: 0;
    left: 0;
    width: 40px;
    padding-top: var(--space-4);
    border-right: 1px solid var(--border-code);
    text-align: right;
    color: var(--code-line-numbers);
    pointer-events: none;
    user-select: none;
}

.hljs .line-numbers-rows span {
    display: block;
    counter-increment: line;
}

.hljs .line-numbers-rows span::before {
    content: counter(line);
    display: block;
    padding-right: var(--space-2);
}

pre {
    margin: 0 0 var(--space-3) 0;
    border-radius: var(--radius-md);
    overflow-x: auto;
    overflow-y: hidden;
    max-width: 100%;
}

code {
    background-color: var(--bg-code);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
}

/* ========================================
   BUTTONS (UNIFIED SYSTEM)
   ======================================== */

.btn {
    padding: var(--space-2) var(--space-4);
    border: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background-color: var(--button-primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--button-primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-success {
    background-color: var(--button-success);
    color: white;
}

.btn-success:hover {
    background-color: var(--button-success-hover);
}

.btn-danger {
    background-color: var(--button-danger);
    color: white;
}

.btn-danger:hover {
    opacity: 0.9;
}

.btn-secondary {
    background-color: var(--button-secondary);
    color: white;
}

.btn-secondary:hover {
    background-color: var(--button-secondary-hover);
}

.btn-gradient {
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    color: white;
    border: none;
    box-shadow: var(--shadow-sm);
}

.btn-gradient:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Small action buttons (copy, delete, etc.) */
.btn-sm {
    padding: var(--space-1) var(--space-2);
    font-size: 12px;
    border-radius: var(--radius-sm);
}

/* ========================================
   CARDS (for browse, profile, etc.)
   ======================================== */

.card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
}

.card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.card-header {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    margin-bottom: var(--space-3);
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    margin: 0;
}

.card-body {
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-secondary);
}

/* ========================================
   BADGES
   ======================================== */

.badge {
    display: inline-block;
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-sm);
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-public {
    background-color: rgba(0, 122, 255, 0.1);
    color: var(--button-primary);
}

.badge-private {
    background-color: rgba(255, 204, 0, 0.1);
    color: #f5a623;
}

.badge-success {
    background-color: rgba(40, 167, 69, 0.1);
    color: var(--button-success);
}

.badge-danger {
    background-color: rgba(220, 53, 69, 0.1);
    color: var(--button-danger);
}

/* ========================================
   FORMS & INPUTS (UNIFIED)
   ======================================== */

.form-group {
    margin-bottom: var(--space-4);
}

.form-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--space-1);
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: var(--space-3);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 14px;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    transition: all 0.2s ease;
    box-sizing: border-box;
    font-family: inherit;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--button-primary);
    box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 100px;
}

/* Radio buttons */
.radio-group {
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: max-content;
    gap: var(--space-4);
    margin-bottom: var(--space-3);
}

.radio-label {
    display: grid;
    grid-auto-flow: column;
    align-items: center;
    gap: var(--space-2);
    font-size: 14px;
    cursor: pointer;
}

/* ========================================
   STANDALONE PAGES (index, auth, profile, browse)
   ======================================== */

/* Page container for centered content */
.page-container {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: var(--space-6);
    background-color: var(--bg-primary);
}

.page-header {
    text-align: center;
    margin-bottom: var(--space-8);
}

.page-title {
    font-size: 40px;
    font-weight: 700;
    margin-bottom: var(--space-2);
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
}

/* Centered card container */
.centered-card {
    width: 100%;
    max-width: 480px;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    box-shadow: var(--shadow-lg);
}

/* Wide container for browse page */
.wide-container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-6);
}

/* Stats grid for index page */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-4);
    margin-bottom: var(--space-6);
}

.stat-card {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    text-align: center;
}

.stat-value {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: var(--space-1);
}

.stat-label {
    font-size: 13px;
    opacity: 0.9;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Room grid for browse page */
.room-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-4);
}

.room-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    transition: all 0.2s ease;
    cursor: pointer;
}

.room-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: var(--button-primary);
}

.room-card-header {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    margin-bottom: var(--space-3);
}

.room-card-name {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    font-family: 'SF Mono', Monaco, monospace;
}

.room-card-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: var(--space-2);
    color: var(--text-primary);
}

.room-card-description {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: var(--space-3);
    line-height: 1.5;
}

.room-card-meta {
    font-size: 12px;
    color: var(--text-muted);
}

/* Auth flow steps */
.auth-step {
    display: none;
}

.auth-step.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.auth-logo {
    text-align: center;
    margin-bottom: var(--space-6);
}

.auth-logo h1 {
    font-size: 32px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Profile page specific */
.profile-section {
    margin-bottom: var(--space-6);
    padding-bottom: var(--space-6);
    border-bottom: 1px solid var(--border-color);
}

.profile-section:last-child {
    border-bottom: none;
}

.profile-section h2 {
    margin-bottom: var(--space-4);
}

.theme-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3);
}

.theme-option {
    padding: var(--space-4);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.theme-option:hover {
    border-color: var(--button-primary);
    background-color: var(--bg-hover);
}

.theme-option.active {
    border-color: var(--button-primary);
    background-color: rgba(0, 113, 227, 0.05);
}

.availability-indicator {
    font-size: 12px;
    margin-top: var(--space-1);
}

.availability-indicator.available {
    color: var(--text-success);
}

.availability-indicator.unavailable {
    color: var(--text-error);
}

/* Alert messages */
.alert {
    padding: var(--space-3);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-4);
    font-size: 14px;
}

.alert-success {
    background-color: rgba(40, 167, 69, 0.1);
    color: var(--text-success);
    border: 1px solid var(--button-success);
}

.alert-error {
    background-color: rgba(220, 53, 69, 0.1);
    color: var(--text-error);
    border: 1px solid var(--button-danger);
}

.alert-warning {
    background-color: rgba(255, 193, 7, 0.1);
    color: #f5a623;
    border: 1px solid #f5a623;
}

.alert-info {
    background-color: rgba(0, 122, 255, 0.1);
    color: var(--button-primary);
    border: 1px solid var(--button-primary);
}

/* Empty state */
.empty-state {
    text-align: center;
    padding: var(--space-10);
    color: var(--text-muted);
}

.empty-state-icon {
    font-size: 48px;
    margin-bottom: var(--space-3);
}

.empty-state-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: var(--space-2);
    color: var(--text-secondary);
}

.empty-state-description {
    font-size: 14px;
    color: var(--text-muted);
}

/* ========================================
   MOBILE RESPONSIVE
   ======================================== */

/* Hamburger menu */
#hamburger-button {
    display: none;
    position: fixed;
    top: var(--space-4);
    left: var(--space-4);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--space-2) var(--space-3);
    cursor: pointer;
    z-index: 1001;
    box-shadow: var(--shadow-md);
}

/* Modal overlay */
#room-list-modal, #auth-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--modal-overlay);
    z-index: 1002;
    justify-content: center;
    align-items: center;
}

#room-list-modal-content, #auth-modal-content {
    background-color: var(--bg-secondary);
    padding: var(--space-6);
    border-radius: var(--radius-xl);
    width: 90%;
    max-width: 400px;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    box-shadow: var(--shadow-lg);
}

#close-modal-button {
    position: absolute;
    top: var(--space-3);
    right: var(--space-3);
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: none;
    border-radius: var(--radius-sm);
    width: 32px;
    height: 32px;
    font-size: 18px;
    cursor: pointer;
    display: grid;
    place-items: center;
    transition: background-color 0.2s ease;
}

#close-modal-button:hover {
    background-color: var(--bg-hover);
}

@media (max-width: 1024px) {
    .main-container {
        grid-template-columns: 200px 1fr 240px;
    }
}

@media (max-width: 768px) {
    .main-container {
        grid-template-columns: 1fr;
    }

    #rooms-list, .utility-belt {
        display: none;
    }

    #hamburger-button {
        display: block;
    }

    #chat-container {
        padding: var(--space-3);
    }

    .centered-card {
        padding: var(--space-6);
    }

    .room-grid {
        grid-template-columns: 1fr;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   UTILITY CLASSES
   ======================================== */

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }

.mb-1 { margin-bottom: var(--space-1); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

.p-0 { padding: 0; }
.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }

.fw-600 { font-weight: 600; }
.fw-700 { font-weight: 700; }

.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }

.w-100 { width: 100%; }

/* ========================================
   SCROLLBAR STYLING
   ======================================== */

::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color-dark);
    border-radius: 5px;
}

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

* {
    scrollbar-width: thin;
    scrollbar-color: var(--border-color-dark) var(--bg-secondary);
}

/* ========================================
   LINK STYLING
   ======================================== */

a {
    color: var(--link-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--link-hover);
    text-decoration: underline;
}

/* ========================================
   SPECIAL: Search Results Page
   ======================================== */

#search-results {
    padding: var(--space-4);
}

.search-result {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    margin-bottom: var(--space-3);
    transition: all 0.2s ease;
}

.search-result:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--button-primary);
}

.search-result-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: var(--space-2);
}

.search-result-room {
    font-size: 12px;
    color: var(--text-muted);
    font-family: 'SF Mono', Monaco, monospace;
    margin-bottom: var(--space-2);
}

.search-result-score {
    font-size: 12px;
    color: var(--text-secondary);
}

/* Per-sentence highlight while TTS reads a message aloud */
.tts-sentence {
    border-radius: 2px;
    transition: background-color 0.12s ease;
}
.tts-sentence.tts-reading {
    background: rgba(255, 209, 64, 0.45);
    -webkit-box-decoration-break: clone;
    box-decoration-break: clone;
}