/* Echo-Infinity Project Page — global styles
 * Adapted from Meta-CoT/index.html v2 inline CSS, with video-card additions.
 */

/* ============================================
 * Base
 * ============================================ */
html { scroll-behavior: smooth; }
body { font-family: 'Space Grotesk', sans-serif; }
section[id] { scroll-margin-top: 3.5rem; }

/* ============================================
 * Scroll-to-top button
 * ============================================ */
#scroll-top-btn {
    transition: opacity 0.3s ease, transform 0.3s ease, background-color 0.3s ease;
}
#scroll-top-btn.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

/* ============================================
 * Hover float for figures
 * ============================================ */
img[data-zoomable] {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
img[data-zoomable]:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

/* ============================================
 * Showcase wrapper (3D rolled, sticky scroll)
 * ============================================ */
#showcase-wrapper {
    position: relative;
    min-height: 100vh;
    overflow: hidden;
    perspective: 1200px;
}
#showcase-hero {
    position: absolute;
    top: 0; left: 0; right: 0;
    z-index: 10;
    pointer-events: none;
}
#showcase-hero * { pointer-events: auto; }
#showcase-rows {
    transform-style: preserve-3d;
    padding-top: 0;
    will-change: transform, opacity;
}
.showcase-row {
    display: flex;
    gap: 1.2rem;
    padding: 0.7rem 2rem;
    overflow: hidden;                     /* clip the .row-track marquee */
    align-items: center;
}
.showcase-row::-webkit-scrollbar { display: none; }

/* Marquee track — driven by CSS @keyframes (GPU-composited, no rAF throttling) */
.row-track {
    display: flex;
    gap: 1.2rem;
    flex-shrink: 0;
    will-change: transform;
    animation-name: row-marquee;
    animation-timing-function: linear;
    animation-iteration-count: infinite;
    /* duration + direction are set per-row inline by main.js based on track width */
}
.showcase-row:hover .row-track {
    animation-play-state: paused;
}
@keyframes row-marquee {
    from { transform: translate3d(0, 0, 0); }
    to   { transform: translate3d(-50%, 0, 0); }
}

/* (row-label removed — each card's corner badge identifies its row) */

/* ============================================
 * Video card (replaces Meta-CoT triplet-card)
 * ============================================ */
.video-card {
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    background: white;
    border-radius: 12px;
    padding: 8px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-decoration: none;
    color: inherit;
    width: 250px;            /* +30% from 192 px */
    cursor: pointer;
}
.video-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 24px rgba(0,0,0,0.16);
}
.video-card .video-wrap {
    position: relative;
    width: 100%;
    aspect-ratio: 832 / 480;  /* matches source video */
    background: #000;
    border-radius: 8px;
    overflow: hidden;
}
.video-card video,
.video-card .video-wrap > img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.video-card .badge {
    position: absolute;
    bottom: 6px;
    right: 6px;
    background: rgba(0, 0, 0, 0.6);
    color: white;
    font-size: 0.72rem;
    padding: 2px 7px;
    border-radius: 4px;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}
/* 24h split-card distinct badge ─ tells viewer "click expands into Part 1+2" */
.video-card.yt-split .badge.badge-split {
    background: linear-gradient(135deg, #2563eb, #7c3aed);
    color: white;
    font-weight: 700;
}

/* Explanatory banner above a showcase row (e.g. above the 24h row).
 * Sibling of .showcase-row inside #showcase-rows; not part of marquee. */
.row-note {
    max-width: 940px;
    margin: 0.6rem auto 0.4rem;
    padding: 0.75rem 1.25rem;
    text-align: center;
    font-size: 0.95rem;
    line-height: 1.5;
    color: #1f2937;
    background: rgba(59, 130, 246, 0.10);
    border-left: 4px solid #3b82f6;
    border-radius: 8px;
    font-weight: 500;
}
.row-note i { margin-right: 0.35em; color: #3b82f6; }
html.dark .row-note {
    color: #cbd5e1;
    background: rgba(96, 165, 250, 0.14);
}
html.dark .row-note i { color: #93c5fd; }
/* Play overlay (YouTube cards) */
.video-card .play-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 6px;
    background: linear-gradient(0deg, rgba(0,0,0,0.55), rgba(0,0,0,0.15));
    color: white;
    font-size: 0.78rem;
    font-weight: 600;
    text-shadow: 0 1px 4px rgba(0,0,0,0.6);
    transition: background 0.25s ease;
}
.video-card.yt:hover .play-overlay {
    background: linear-gradient(0deg, rgba(0,0,0,0.7), rgba(0,0,0,0.25));
}
.video-card .play-overlay i {
    font-size: 1.6rem;
    color: white;
    background: rgba(220, 38, 38, 0.95);   /* YouTube red */
    width: 48px;
    height: 48px;
    border-radius: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0,0,0,0.4);
}

/* Prompt under the video */
.video-card .prompt {
    font-size: 0.78rem;
    line-height: 1.35;
    color: #4b5563;
    margin-top: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    cursor: pointer;
    transition: color 0.2s ease;
}
.video-card .prompt:hover { color: #1d4ed8; }

/* 60s multi-prompt expand block (used by both showcase cards and comparison blocks) */
.video-card .multi-prompt-toggle,
.cmp-block .multi-prompt-toggle {
    margin-top: 6px;
    font-size: 0.68rem;
    color: #2563eb;
    cursor: pointer;
    font-weight: 600;
    user-select: none;
}
.video-card .multi-prompt-toggle:hover,
.cmp-block .multi-prompt-toggle:hover { text-decoration: underline; }
.video-card .multi-prompt-list,
.cmp-block .multi-prompt-list {
    display: none;
    margin-top: 6px;
    padding-left: 0;
    list-style: none;
    font-size: 0.65rem;
    line-height: 1.35;
    color: #4b5563;
    max-height: 220px;
    overflow-y: auto;
    border-top: 1px solid #e5e7eb;
    padding-top: 6px;
}
.video-card .multi-prompt-list.open,
.cmp-block .multi-prompt-list.open { display: block; }
.video-card .multi-prompt-list li,
.cmp-block .multi-prompt-list li {
    margin-bottom: 6px;
}
.video-card .multi-prompt-list li::before,
.cmp-block .multi-prompt-list li::before {
    content: attr(data-segment);
    display: inline-block;
    background: #2563eb;
    color: white;
    font-size: 0.55rem;
    padding: 1px 5px;
    border-radius: 3px;
    margin-right: 5px;
    font-weight: 700;
    letter-spacing: 0.04em;
}
/* Comparison blocks have wider prompt area, allow more list rows */
.cmp-block .multi-prompt-list {
    font-size: 0.78rem;
    max-height: 320px;
    margin-left: 16px;
    margin-right: 16px;
}
.cmp-block .multi-prompt-toggle {
    display: inline-block;
    font-size: 0.78rem;
    margin-left: 16px;
    margin-top: 8px;
}
.cmp-block .multi-prompt-list li::before {
    font-size: 0.65rem;
}

/* ============================================
 * Prompt modal
 * ============================================ */
#prompt-modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 200;
    background: rgba(0,0,0,0.78);
    display: none;
    align-items: center;
    justify-content: center;
    padding: 24px;
}
#prompt-modal-overlay.active { display: flex; }

#prompt-modal-content {
    display: grid;
    grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);   /* video : prompt = 3 : 2 */
    gap: 1.5rem;
    background: white;
    border-radius: 16px;
    padding: 24px;
    max-width: 1200px;
    width: 100%;
    max-height: 88vh;
    box-shadow: 0 25px 60px rgba(0,0,0,0.3);
    overflow: hidden;
    position: relative;
}
@media (max-width: 768px) {
    #prompt-modal-content {
        grid-template-columns: 1fr;
        max-height: 92vh;
        overflow-y: auto;
    }
}

#prompt-modal-close {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 36px;
    height: 36px;
    border-radius: 18px;
    background: #f3f4f6;
    color: #374151;
    border: none;
    cursor: pointer;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s ease;
}
#prompt-modal-close:hover { background: #e5e7eb; }

#prompt-modal-video-wrap {
    background: #000;
    border-radius: 10px;
    overflow: hidden;
    aspect-ratio: 832 / 480;
    align-self: center;          /* vertical-center the video when prompt column is taller */
    width: 100%;
}
/* When the modal is rendering multiple stacked parts (24h split), drop the
 * fixed aspect-ratio + black background so the iframes can size themselves
 * and the wrapper scrolls if needed. */
#prompt-modal-video-wrap:has(.modal-part) {
    background: transparent;
    aspect-ratio: auto;
    overflow-y: auto;
    max-height: 80vh;
    align-self: stretch;
}
#prompt-modal-video-wrap .modal-part {
    margin-bottom: 0.9rem;
}
#prompt-modal-video-wrap .modal-part:last-child { margin-bottom: 0; }
#prompt-modal-video-wrap .modal-part-label {
    font-size: 0.7rem;
    font-weight: 700;
    color: #6b7280;
    margin-bottom: 5px;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}
#prompt-modal-video-wrap .modal-part iframe {
    width: 100%;
    aspect-ratio: 832 / 480;
    border: 0;
    border-radius: 8px;
    background: #000;
    display: block;
}
html.dark #prompt-modal-video-wrap .modal-part-label { color: #9ca3af; }

/* Light styling for the in-modal repeat of the row note */
#prompt-modal-text .modal-note {
    font-size: 0.83rem;
    line-height: 1.5;
    padding: 0.55rem 0.8rem;
    background: rgba(59, 130, 246, 0.08);
    border-left: 3px solid #3b82f6;
    border-radius: 6px;
    margin: 0.4rem 0;
    color: #1e40af;
}
html.dark #prompt-modal-text .modal-note {
    background: rgba(96, 165, 250, 0.15);
    color: #bfdbfe;
}

/* In-modal real prompt (24h split cards). Sits above the modal-note. */
#prompt-modal-text .modal-prompt {
    font-size: 0.92rem;
    line-height: 1.55;
    margin: 0.6rem 0;
    color: #374151;
}
html.dark #prompt-modal-text .modal-prompt { color: #d1d5db; }

#prompt-modal-video {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

#prompt-modal-text {
    font-size: 0.95rem;
    line-height: 1.6;
    color: #1f2937;
    overflow-y: auto;
    max-height: 70vh;
    padding-right: 4px;
}
#prompt-modal-text h4 {
    font-weight: 700;
    margin-bottom: 8px;
    color: #111827;
}
#prompt-modal-text .seg {
    margin-bottom: 12px;
    padding-left: 12px;
    border-left: 3px solid #3b82f6;
}
#prompt-modal-text .seg .seg-tag {
    display: inline-block;
    background: #2563eb;
    color: white;
    font-size: 0.65rem;
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 700;
    letter-spacing: 0.04em;
    margin-bottom: 4px;
}

/* ============================================
 * Pull-up content overlay
 * ============================================ */
#main-content {
    position: relative;
    z-index: 20;
    background: white;
    will-change: transform;
    box-shadow: 0 -8px 30px rgba(0, 0, 0, 0.08);
}

/* ============================================
 * Fade-in animation
 * ============================================ */
.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}
.fade-in-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
 * Gradient text
 * ============================================ */
.gradient-text {
    background: linear-gradient(135deg, #2563eb, #7c3aed);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ============================================
 * Tables (Quantitative Results)
 * ============================================ */
.data-table {
    border-collapse: collapse;
    width: 100%;
    font-size: 0.95rem;
}
.data-table thead th {
    background: linear-gradient(135deg, #2563eb, #4f46e5);
    color: #ffffff !important;
    padding: 0.75rem 0.6rem;
    font-weight: 600;
    text-align: center;
    white-space: nowrap;
    font-size: 1.0rem;
}
.data-table tbody td {
    padding: 0.5rem 0.5rem;
    text-align: center;
    border-bottom: 1px solid #e5e7eb;
    white-space: nowrap;
    color: #4b5563;
}
.data-table tbody tr:hover { background: #f9fafb; }
.data-table .method-name {
    text-align: left;
    font-weight: 500;
    padding-left: 0.8rem;
    color: #111827;
}
.data-table .row-ours {
    background: #eff6ff;          /* light blue — matches Meta-CoT */
    font-weight: 700;
}
.data-table .row-ours td {
    color: #1e40af;
    border-bottom: none;
}
.data-table .best { color: #2563eb; font-weight: 700; }
.data-table .section-label td {
    background: #f3f4f6;
    font-weight: 600;
    color: #6b7280;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.4rem;
}

/* ============================================
 * Medium-zoom overlay
 * ============================================ */
.medium-zoom-overlay {
    background: rgba(0, 0, 0, 0.78) !important;
    z-index: 150 !important;
}
.medium-zoom-image--opened { z-index: 151 !important; }

/* ============================================
 * Animation
 * ============================================ */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}
.animate-pulse { animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite; }

/* ============================================
 * DARK MODE
 * ============================================ */
html.dark body {
    background-color: #111827;
    color: #e5e7eb;
}
html.dark .bg-gray-50,
html.dark section.bg-gray-50 { background-color: #1f2937 !important; }
html.dark .bg-white { background-color: #111827 !important; }
html.dark #top-nav {
    background-color: rgba(17, 24, 39, 0.8);
    border-bottom-color: #374151;
}
html.dark #top-nav a,
html.dark #top-nav .text-gray-600 { color: #d1d5db; }
html.dark #top-nav a:hover { color: #93c5fd; }

html.dark .text-gray-900 { color: #f3f4f6 !important; }
html.dark .text-gray-800 { color: #e5e7eb !important; }
html.dark .text-gray-700 { color: #d1d5db !important; }
html.dark .text-gray-600 { color: #9ca3af !important; }
html.dark .text-gray-500 { color: #9ca3af !important; }
html.dark .text-gray-400 { color: #6b7280 !important; }
html.dark .border-gray-200 { border-color: #374151 !important; }
html.dark .border-gray-300 { border-color: #4b5563 !important; }
html.dark .bg-gray-100 { background-color: #1f2937 !important; }

/* Dark video card */
html.dark .video-card {
    background: #1f2937;
    box-shadow: 0 2px 12px rgba(0,0,0,0.4);
}
html.dark .video-card .prompt { color: #9ca3af; }
html.dark .video-card .prompt:hover { color: #93c5fd; }
html.dark .video-card .multi-prompt-list,
html.dark .cmp-block .multi-prompt-list { color: #9ca3af; border-top-color: #374151; }
html.dark .video-card .multi-prompt-toggle,
html.dark .cmp-block .multi-prompt-toggle { color: #93c5fd; }

/* Dark prompt modal */
html.dark #prompt-modal-overlay { background: rgba(0,0,0,0.88); }
html.dark #prompt-modal-content {
    background: #1f2937;
    box-shadow: 0 25px 60px rgba(0,0,0,0.5);
}
html.dark #prompt-modal-text { color: #d1d5db; }
html.dark #prompt-modal-text h4 { color: #f3f4f6; }
html.dark #prompt-modal-close { background: #374151; color: #d1d5db; }
html.dark #prompt-modal-close:hover { background: #4b5563; }

/* Dark main-content */
html.dark #main-content {
    background-color: #111827;
    box-shadow: 0 -8px 30px rgba(0, 0, 0, 0.3);
}

/* Dark contributions cards */
html.dark .bg-gray-50.rounded-xl { background-color: #1f2937 !important; }
html.dark .bg-blue-50 { background-color: #1e3a5f !important; }
html.dark .text-blue-900 { color: #93c5fd !important; }
html.dark .text-blue-900\/80 { color: rgba(147, 197, 253, 0.85) !important; }
html.dark .border-blue-600 { border-color: #3b82f6 !important; }

/* Dark tables */
html.dark .data-table tbody td {
    border-bottom-color: #374151;
    color: #d1d5db;
}
html.dark .data-table tbody tr:hover { background: #1f2937; }
html.dark .data-table .method-name { color: #f3f4f6; }
html.dark .data-table .row-ours { background: #1e3a5f; }
html.dark .data-table .row-ours td { color: #93c5fd; }
html.dark .data-table .section-label td {
    background: #1f2937;
    color: #9ca3af;
}
html.dark .data-table .best { color: #60a5fa; }

/* Dark scroll-to-top */
html.dark #scroll-top-btn {
    background-color: #374151;
    color: #d1d5db;
    border-color: #4b5563;
}
html.dark #scroll-top-btn:hover { background-color: #4b5563; }

/* Dark figure shadow */
html.dark img[data-zoomable]:hover {
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

html.dark .medium-zoom-overlay { background: rgba(0, 0, 0, 0.88) !important; }

/* Dark white-bg method cards */
html.dark .bg-white.rounded-xl { background-color: #1f2937 !important; }

/* ============================================
 * Qualitative Comparison grid (rendered by main.js)
 * ============================================ */
.cmp-section-title {
    font-size: 1.4rem;
    font-weight: 700;
    text-align: center;
    margin: 2.5rem 0 1.5rem;
    color: #111827;
    letter-spacing: -0.01em;
}
.cmp-block {
    margin-bottom: 2.5rem;
}
.cmp-row {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1rem;
}
@media (max-width: 768px) {
    .cmp-row { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
.cmp-cell {
    background: white;
    border-radius: 12px;
    padding: 8px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.07);
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.cmp-cell .method-tag {
    display: inline-block;
    align-self: flex-start;
    background: #f3f4f6;
    color: #374151;
    font-size: 0.72rem;
    padding: 3px 10px;
    border-radius: 999px;
    font-weight: 600;
    letter-spacing: 0.02em;
}
.cmp-cell .method-tag.method-ours {
    background: linear-gradient(135deg, #2563eb, #7c3aed);
    color: white;
}
.cmp-cell .video-wrap {
    position: relative;
    width: 100%;
    aspect-ratio: 832 / 480;
    background: #000;
    border-radius: 8px;
    overflow: hidden;
}
.cmp-cell video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.cmp-prompt {
    margin-top: 12px;
    padding: 12px 16px;
    background: white;
    border-left: 3px solid #2563eb;
    border-radius: 6px;
    font-size: 0.88rem;
    line-height: 1.55;
    color: #374151;
    cursor: pointer;
    transition: background 0.2s ease;
}
.cmp-prompt:hover { background: #f9fafb; }

/* Dark mode for comparison */
html.dark .cmp-section-title { color: #f3f4f6; }
html.dark .cmp-cell {
    background: #1f2937;
    box-shadow: 0 2px 12px rgba(0,0,0,0.4);
}
html.dark .cmp-cell .method-tag {
    background: #374151;
    color: #d1d5db;
}
html.dark .cmp-prompt {
    background: #1f2937;
    color: #d1d5db;
    border-left-color: #60a5fa;
}
html.dark .cmp-prompt:hover { background: #111827; }

/* ============================================
 * Info banner (under TLDR)
 * ============================================ */
html.dark #load-banner {
    background-color: #1e3a5f !important;
    border-color: #2563eb !important;
}
html.dark #load-banner .text-blue-900 { color: #bfdbfe !important; }
html.dark #load-banner .text-blue-600 { color: #93c5fd !important; }