/* ============================================
   Project Page — Technical Cinema
   Scroll-driven reveals, glowing depth,
   refined typography hierarchy
   ============================================ */

/* ── Scroll-triggered reveal system ── */
.proj-reveal {
    opacity: 0;
    transform: translateY(32px);
    transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.proj-reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger children */
.proj-reveal-stagger > * {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.proj-reveal-stagger.revealed > *:nth-child(1) { transition-delay: 0ms; }
.proj-reveal-stagger.revealed > *:nth-child(2) { transition-delay: 80ms; }
.proj-reveal-stagger.revealed > *:nth-child(3) { transition-delay: 160ms; }
.proj-reveal-stagger.revealed > *:nth-child(4) { transition-delay: 240ms; }
.proj-reveal-stagger.revealed > *:nth-child(5) { transition-delay: 320ms; }
.proj-reveal-stagger.revealed > *:nth-child(6) { transition-delay: 400ms; }
.proj-reveal-stagger.revealed > *:nth-child(7) { transition-delay: 480ms; }

.proj-reveal-stagger.revealed > * {
    opacity: 1;
    transform: translateY(0);
}

/* ── Section scroll offset ── */
.proj-section[id] {
    scroll-margin-top: 24px;
}

/* ── Hero ── */
.project-hero {
    position: relative;
    width: 100%;
    height: 70vh;
    min-height: 420px;
    max-height: 600px;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 3.5rem 2.5rem;
    overflow: hidden;
}

/* Animated gradient overlay */
.project-hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        170deg,
        rgba(16, 20, 31, 0.2) 0%,
        rgba(16, 20, 31, 0.55) 50%,
        rgba(16, 20, 31, 0.92) 100%
    );
    z-index: 1;
}

/* Accent glow at bottom of hero */
.project-hero::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 120px;
    background: linear-gradient(to top, var(--bg-deep) 0%, transparent 100%);
    z-index: 2;
}

/* (scan lines removed for performance) */

[data-theme="light"] .project-hero-overlay {
    background: linear-gradient(
        170deg,
        rgba(245, 246, 250, 0.1) 0%,
        rgba(245, 246, 250, 0.5) 50%,
        rgba(245, 246, 250, 0.95) 100%
    );
}

[data-theme="light"] .project-hero::after {
    background: linear-gradient(to top, var(--bg-deep) 0%, transparent 100%);
}

/* (light scan lines removed for performance) */

/* ── Back link ── */
.project-back {
    position: absolute;
    top: 1.5rem;
    left: 2.5rem;
    z-index: 3;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: #fff;
    text-decoration: none;
    font-family: var(--font-display);
    font-size: 0.8rem;
    letter-spacing: 0.06em;
    opacity: 0.7;
    transition: opacity 0.3s, transform 0.3s var(--ease-spring);
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    background: rgba(0, 0, 0, 0.35);
}

.project-back:hover {
    opacity: 1;
    transform: translateX(-3px);
}

[data-theme="light"] .project-back {
    color: var(--text-primary);
    background: rgba(0, 0, 0, 0.05);
}

/* ── Hero title ── */
.project-hero-title {
    position: relative;
    z-index: 3;
    color: #fff;
    font-family: var(--font-display);
    font-size: clamp(1.6rem, 4.5vw, 2.8rem);
    font-weight: 700;
    line-height: 1.15;
    margin: 0;
    max-width: 700px;
    letter-spacing: -0.01em;
    animation: heroTitleIn 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.2s both;
}

@keyframes heroTitleIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Accent underline on title */
.project-hero-title::after {
    content: '';
    display: block;
    width: 48px;
    height: 3px;
    background: var(--accent);
    border-radius: 2px;
    margin-top: 1rem;
    animation: titleBarIn 0.6s cubic-bezier(0.16, 1, 0.3, 1) 0.6s both;
    box-shadow: 0 0 12px rgba(56, 189, 248, 0.4);
}

@keyframes titleBarIn {
    from {
        width: 0;
        opacity: 0;
    }
    to {
        width: 48px;
        opacity: 1;
    }
}

[data-theme="light"] .project-hero-title {
    color: var(--text-primary);
}

[data-theme="light"] .project-hero-title::after {
    box-shadow: 0 0 8px rgba(14, 143, 208, 0.3);
}

/* ── Layout: content + sidebar ── */
.project-layout {
    display: flex;
    max-width: 1100px;
    margin: 0 auto;
    position: relative;
}

.project-content {
    flex: 1;
    min-width: 0;
    max-width: 800px;
    padding: 3.5rem 2.5rem 6rem;
    min-height: 40vh;
}

/* ── TOC Sidebar ── */
.proj-toc {
    width: 210px;
    flex-shrink: 0;
    position: relative;
}

.proj-toc-inner {
    position: sticky;
    top: 2rem;
    padding: 2rem 0 2rem 0.5rem;
}

.proj-toc-title {
    display: block;
    font-family: var(--font-display);
    font-size: 0.65rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 1.25rem;
    padding-left: 0.75rem;
}

.proj-toc-link {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    text-decoration: none;
    padding: 0.45rem 0.75rem;
    border-left: 2px solid transparent;
    transition: color 0.3s, border-color 0.3s, background 0.3s, padding-left 0.3s;
    line-height: 1.4;
    border-radius: 0 4px 4px 0;
}

.proj-toc-link:hover {
    color: var(--text-secondary);
    background: var(--accent-dim);
    padding-left: 1rem;
}

.proj-toc-link.active {
    color: var(--accent);
    border-left-color: var(--accent);
    background: var(--accent-dim);
}

/* ── Progress bar on TOC ── */
.proj-toc-progress {
    position: absolute;
    top: 0;
    left: 0;
    width: 2px;
    height: 100%;
    background: var(--border);
    border-radius: 1px;
    overflow: hidden;
}

.proj-toc-progress-fill {
    width: 100%;
    height: 0%;
    background: var(--accent);
    border-radius: 1px;
    transition: height 0.15s linear;
    /* clean bar, no glow */
}

/* ── Meta bar ── */
.proj-meta {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
    background: var(--border);
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 3.5rem;
    box-shadow: 0 2px 16px rgba(0, 0, 0, 0.12);
}

.proj-meta-item {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    padding: 1.15rem 1.3rem;
    background: var(--bg-surface);
    transition: background 0.3s;
}

.proj-meta-item:hover {
    background: var(--bg-card);
}

.proj-meta-label {
    font-family: var(--font-display);
    font-size: 0.65rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.proj-meta-value {
    font-size: 0.88rem;
    color: var(--text-primary);
    line-height: 1.4;
}

.proj-meta-link {
    font-size: 0.88rem;
    color: var(--accent);
    text-decoration: none;
    transition: color 0.2s, text-shadow 0.2s;
}

.proj-meta-link:hover {
    color: var(--accent-hover);
    text-shadow: 0 0 8px rgba(56, 189, 248, 0.3);
}

/* ── Section styling ── */
.proj-section {
    margin-bottom: 4rem;
}

.proj-heading {
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

/* Glowing dot before heading */
.proj-heading::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent);
    flex-shrink: 0;
}

/* Animated bottom line */
.proj-heading::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 0;
    height: 1px;
    background: linear-gradient(90deg, var(--accent), transparent);
    transition: width 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.proj-section.revealed .proj-heading::after {
    width: 100%;
}

.proj-section p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.85;
    margin-bottom: 1.1rem;
}

.proj-section p strong {
    color: var(--text-primary);
    font-weight: 600;
}

.proj-section p em {
    color: var(--accent);
    font-style: normal;
    font-weight: 500;
}

/* ── Figures ── */
.proj-figure {
    margin: 2rem 0;
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid var(--border);
    background: var(--bg-card);
    transition: border-color 0.4s, box-shadow 0.4s;
    position: relative;
}

.proj-figure:hover {
    border-color: rgba(56, 189, 248, 0.2);
}

.proj-figure img {
    width: 100%;
    display: block;
}

.proj-figure figcaption {
    padding: 0.85rem 1.1rem;
    font-family: var(--font-display);
    font-size: 0.72rem;
    color: var(--text-muted);
    letter-spacing: 0.03em;
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.proj-figure figcaption::before {
    content: '◆';
    color: var(--accent);
    font-size: 0.55rem;
    opacity: 0.7;
}

/* ── Side-by-side figures ── */
.proj-figure-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
    margin: 2rem 0;
}

.proj-figure-row .proj-figure {
    margin: 0;
}

@media (max-width: 700px) {
    .proj-figure-row {
        grid-template-columns: 1fr;
    }
}

/* ── Sub-headings (h3) ── */
.proj-subheading {
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 2rem 0 0.75rem;
    letter-spacing: 0.02em;
}

/* ── Bullet list ── */
.proj-list {
    list-style: none;
    padding: 0;
    margin: 0 0 1.5rem;
}
.proj-list li {
    position: relative;
    padding-left: 1.4em;
    margin-bottom: 0.5rem;
    font-family: var(--font-display);
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.6;
}
.proj-list li::before {
    content: '\25B8';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-size: 0.85em;
}

/* ── Comparison cards ── */
.proj-comparison {
    display: flex;
    align-items: stretch;
    gap: 1.25rem;
    margin: 2rem 0;
}

.proj-compare-card {
    flex: 1;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.5rem;
    transition: transform 0.4s var(--ease-spring),
                box-shadow 0.4s,
                border-color 0.4s;
    position: relative;
    overflow: hidden;
}

.proj-compare-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
}

.proj-compare-card h4 {
    font-family: var(--font-display);
    font-size: 0.88rem;
    color: var(--text-primary);
    margin-bottom: 0.6rem;
    letter-spacing: 0.02em;
}

.proj-compare-card p {
    font-size: 0.85rem !important;
    line-height: 1.65 !important;
    margin-bottom: 0.75rem !important;
}

.proj-compare-label {
    display: inline-block;
    font-family: var(--font-display);
    font-size: 0.6rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    padding: 0.25rem 0.6rem;
    border-radius: 4px;
    margin-bottom: 0.6rem;
    font-weight: 700;
}

.proj-compare-before {
    background: rgba(239, 68, 68, 0.12);
    color: #f87171;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.proj-compare-after {
    background: rgba(52, 211, 153, 0.12);
    color: #34d399;
    border: 1px solid rgba(52, 211, 153, 0.2);
}

.proj-compare-score {
    font-family: var(--font-display);
    font-size: 0.78rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.proj-compare-arrow {
    flex-shrink: 0;
    animation: arrowPulse 2s ease-in-out infinite;
}

@keyframes arrowPulse {
    0%, 100% { opacity: 0.7; transform: translateX(0); }
    50% { opacity: 1; transform: translateX(4px); }
}

/* ── Hardware grid ── */
.proj-hw-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1px;
    background: var(--border);
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 2rem;
    box-shadow: 0 2px 16px rgba(0, 0, 0, 0.1);
}

.proj-hw-item {
    background: var(--bg-card);
    padding: 1.5rem;
    transition: background 0.3s;
    position: relative;
}

.proj-hw-item:hover {
    background: var(--bg-elevated);
}

.proj-hw-item h4 {
    font-family: var(--font-display);
    font-size: 0.78rem;
    color: var(--accent);
    margin-bottom: 0.6rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Icon accent for hw items */
.proj-hw-item h4::before {
    content: '▸';
    font-size: 0.7rem;
    opacity: 0.6;
}

.proj-hw-item p {
    font-size: 0.85rem !important;
    line-height: 1.7 !important;
    margin-bottom: 0 !important;
}

/* ── Results stats ── */
.proj-results-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
    background: var(--border);
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 2px 16px rgba(0, 0, 0, 0.1);
}

.proj-result-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 1.75rem 1rem;
    background: var(--bg-card);
    gap: 0.5rem;
    transition: background 0.3s;
    position: relative;
}

.proj-result-stat:hover {
    background: var(--bg-elevated);
}

.proj-result-number {
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--accent);
    line-height: 1;
}

.proj-result-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    line-height: 1.4;
    max-width: 140px;
}

/* ── Tags ── */
.proj-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.proj-tags span {
    font-family: var(--font-display);
    font-size: 0.72rem;
    color: var(--accent);
    background: var(--accent-dim);
    padding: 0.4rem 0.8rem;
    border-radius: 5px;
    letter-spacing: 0.03em;
    border: 1px solid rgba(56, 189, 248, 0.1);
    transition: transform 0.3s var(--ease-spring),
                background 0.3s,
                border-color 0.3s,
                box-shadow 0.3s;
    cursor: default;
}

.proj-tags span:hover {
    transform: translateY(-2px);
    background: rgba(56, 189, 248, 0.18);
    border-color: rgba(56, 189, 248, 0.25);
}

/* ── Section divider ── */
.proj-divider {
    width: 100%;
    height: 1px;
    background: linear-gradient(
        90deg,
        transparent 0%,
        var(--border) 20%,
        var(--accent) 50%,
        var(--border) 80%,
        transparent 100%
    );
    opacity: 0.4;
    margin: 1rem 0 2.5rem;
}

/* ── Responsive ── */
@media (max-width: 1024px) {
    .proj-toc {
        display: none;
    }
    .project-layout {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .project-hero {
        height: 55vh;
        min-height: 300px;
        padding: 2.5rem 1.5rem;
    }
    .project-back {
        top: 1rem;
        left: 1.5rem;
    }
    .project-content {
        padding: 2.5rem 1.5rem 4rem;
    }
    .proj-meta {
        grid-template-columns: 1fr 1fr;
    }
    .proj-comparison {
        flex-direction: column;
    }
    .proj-compare-arrow {
        transform: rotate(90deg);
    }
    .proj-hw-grid {
        grid-template-columns: 1fr;
    }
    .proj-results-grid {
        grid-template-columns: 1fr 1fr;
    }
    .proj-section {
        margin-bottom: 3rem;
    }
}

@media (max-width: 480px) {
    .project-hero {
        height: 45vh;
        padding: 2rem 1.25rem;
    }
    .project-content {
        padding: 2rem 1.25rem 3rem;
    }
    .proj-meta {
        grid-template-columns: 1fr;
    }
    .proj-results-grid {
        grid-template-columns: 1fr;
    }
    .proj-heading {
        font-size: 0.78rem;
    }
    .proj-result-number {
        font-size: 1.35rem;
    }
}

/* ==========================================================
   MONGOLIAN MODE — Project page panels
   Body is vertical-lr (from style.css), project hero and
   content become side-by-side horizontal-tb panels.
   ========================================================== */

/* Hero panel */
html[lang="mn"] .project-hero {
    writing-mode: horizontal-tb;
    width: 45vw;
    min-width: 360px;
    height: auto;
    min-height: 100vh;
    max-height: none;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
}

/* Layout: horizontal-tb so content flows normally inside */
html[lang="mn"] .project-layout {
    writing-mode: horizontal-tb;
    flex-shrink: 0;
    max-width: none;
    width: auto;
    min-height: 100vh;
}

html[lang="mn"] .project-content {
    writing-mode: horizontal-tb;
    max-width: none;
    width: var(--mn-panel-w, min(900px, 85vw));
    min-height: 100vh;
    padding: 2.5rem;
    flex-shrink: 0;
}

/* TOC: hide in MN mode (panels don't benefit from sticky TOC) */
html[lang="mn"] .proj-toc {
    display: none;
}

/* Meta bar: stays horizontal grid */
html[lang="mn"] .proj-meta {
    writing-mode: horizontal-tb;
}

/* Comparison, hw grid, results: stay horizontal */
html[lang="mn"] .proj-comparison,
html[lang="mn"] .proj-hw-grid,
html[lang="mn"] .proj-results-grid,
html[lang="mn"] .proj-tags {
    writing-mode: horizontal-tb;
}

/* Figures: horizontal */
html[lang="mn"] .proj-figure {
    writing-mode: horizontal-tb;
}