/* ============================================================
   GridSpin Ideas Lab — Stylesheet
   ============================================================ */

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

:root {
    --bg-deep:    #06060f;
    --bg-primary: #0a0a1a;
    --bg-raised:  #10102a;
    --bg-card:    rgba(255,255,255,0.025);
    --bg-card-h:  rgba(255,255,255,0.05);
    --glass:      rgba(255,255,255,0.04);

    --text-1:     #f0f0ff;
    --text-2:     rgba(240,240,255,0.65);
    --text-3:     rgba(240,240,255,0.38);

    --brand-300:  #a5b4fc;
    --brand-400:  #818cf8;
    --brand-500:  #6366f1;
    --brand-600:  #4f46e5;
    --brand-700:  #4338ca;

    --accent-amber: #f59e0b;
    --accent-rose:  #f43f5e;
    --accent-teal:  #14b8a6;
    --accent-sky:   #38bdf8;
    --accent-violet:#a78bfa;

    --border:     rgba(255,255,255,0.07);
    --radius-sm:  8px;
    --radius:     16px;
    --radius-lg:  24px;

    --ease:       cubic-bezier(0.4, 0, 0.2, 1);
    --ease-out:   cubic-bezier(0, 0, 0.2, 1);
    --ease-spring:cubic-bezier(0.34, 1.56, 0.64, 1);

    --font-sans:  'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-serif: 'Playfair Display', Georgia, 'Times New Roman', serif;
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
    font-family: var(--font-sans);
    background: var(--bg-deep);
    color: var(--text-1);
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
img { max-width: 100%; display: block; }

/* --- Background Canvas --- */
#bg-canvas {
    position: fixed; inset: 0;
    width: 100%; height: 100%;
    z-index: 0; pointer-events: none;
    opacity: 0.35;
}

/* --- Selection --- */
::selection { background: var(--brand-500); color: #fff; }

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
    position: fixed; top: 0; left: 0; right: 0;
    z-index: 100;
    display: flex; align-items: center; justify-content: space-between;
    padding: 1.25rem 2rem;
    background: linear-gradient(180deg, var(--bg-deep) 60%, transparent);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.logo {
    display: flex; align-items: center; gap: 0.6rem;
    transition: opacity 0.2s var(--ease);
}
.logo:hover { opacity: 0.8; }
.logo-img { height: 32px; width: auto; }

.header-badge {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-3);
    padding: 0.35rem 0.85rem;
    border: 1px solid var(--border);
    border-radius: 100px;
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
    position: relative; z-index: 1;
    min-height: 85vh;
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    text-align: center;
    padding: 8rem 2rem 4rem;
    max-width: 56rem; margin: 0 auto;
}

.hero-eyebrow {
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--brand-400);
    margin-bottom: 2rem;
    opacity: 0;
    animation: fadeUp 0.8s 0.2s var(--ease-out) forwards;
}

.hero-title {
    font-family: var(--font-serif);
    font-size: clamp(3rem, 7vw, 5.5rem);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.025em;
    color: var(--text-1);
    margin-bottom: 2rem;
    opacity: 0;
    animation: fadeUp 0.8s 0.35s var(--ease-out) forwards;
}
.hero-title em {
    font-style: italic;
    color: var(--brand-400);
}

.hero-sub {
    font-size: clamp(1.1rem, 2vw, 1.35rem);
    line-height: 1.65;
    color: var(--text-2);
    max-width: 42rem;
    opacity: 0;
    animation: fadeUp 0.8s 0.5s var(--ease-out) forwards;
}

.hero-scroll-cue {
    margin-top: 3rem;
    display: flex; flex-direction: column; align-items: center; gap: 0.5rem;
    color: var(--text-3);
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    opacity: 0;
    animation: fadeUp 0.8s 0.7s var(--ease-out) forwards;
}
.hero-scroll-cue svg {
    animation: bobDown 2s ease-in-out infinite;
}

/* ============================================================
   IDEAS GRID — "The Spin Grid"
   Asymmetric editorial layout echoing the GridSpin diamond logo
   ============================================================ */
.ideas {
    position: relative; z-index: 1;
    max-width: 80rem;
    margin: 0 auto;
    padding: 2rem 2rem 6rem;
}

/* Diamond dot-grid background — echoes the logo */
.ideas::before {
    content: '';
    position: absolute;
    inset: -40px;
    background-image: radial-gradient(circle, rgba(99,102,241,0.08) 1.5px, transparent 1.5px);
    background-size: 32px 32px;
    transform: rotate(45deg);
    pointer-events: none;
    mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black 20%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black 20%, transparent 70%);
}

.ideas-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    grid-auto-rows: minmax(60px, auto);
    gap: 1.25rem;
    perspective: 1200px;
}

/* --- Base Card --- */
.idea-card {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    cursor: pointer;
    overflow: hidden;
    display: flex; flex-direction: column;
    transition:
        transform 0.45s var(--ease-out),
        background 0.35s var(--ease),
        border-color 0.35s var(--ease),
        box-shadow 0.45s var(--ease-out);
    transform-style: preserve-3d;
    will-change: transform;
}

/* Accent edge — left bar, not top */
.idea-card::before {
    content: '';
    position: absolute; top: 1.5rem; bottom: 1.5rem; left: 0;
    width: 3px;
    background: var(--card-accent, var(--brand-500));
    border-radius: 0 3px 3px 0;
    opacity: 0.4;
    transition: opacity 0.35s var(--ease), height 0.35s var(--ease);
}

/* Giant watermark number */
.idea-card::after {
    content: attr(data-num);
    position: absolute;
    top: -0.15em; right: -0.05em;
    font-size: 8rem;
    font-weight: 900;
    line-height: 1;
    color: var(--card-accent, var(--brand-500));
    opacity: 0.03;
    pointer-events: none;
    transition: opacity 0.45s var(--ease);
    font-family: var(--font-sans);
}

.idea-card:hover {
    transform: translateY(-8px) rotateX(1deg);
    background: var(--bg-card-h);
    border-color: rgba(255,255,255,0.14);
    box-shadow:
        0 25px 60px -12px rgba(0,0,0,0.6),
        0 0 0 1px rgba(99,102,241,0.12),
        0 0 40px -20px var(--card-accent, rgba(99,102,241,0.15));
}
.idea-card:hover::before { opacity: 1; }
.idea-card:hover::after { opacity: 0.06; }

/* --- Bespoke Grid Placement --- */
/* Row 1: Two hero cards */
.idea-card:nth-of-type(1)  { grid-column: 1 / 8;  grid-row: span 4; }
.idea-card:nth-of-type(2)  { grid-column: 8 / 13; grid-row: span 4; }
/* Row 2: Three framework cards */
.idea-card:nth-of-type(3)  { grid-column: 1 / 5;  grid-row: span 3; }
.idea-card:nth-of-type(4)  { grid-column: 5 / 9;  grid-row: span 3; }
.idea-card:nth-of-type(5)  { grid-column: 9 / 13; grid-row: span 3; }
/* Row 3: Wide technical + strategy */
.idea-card:nth-of-type(6)  { grid-column: 1 / 6;  grid-row: span 3; }
.idea-card:nth-of-type(7)  { grid-column: 6 / 13; grid-row: span 3; }
/* Row 4: Three insight cards */
.idea-card:nth-of-type(8)  { grid-column: 1 / 5;  grid-row: span 3; }
.idea-card:nth-of-type(9)  { grid-column: 5 / 9;  grid-row: span 3; }
.idea-card:nth-of-type(10) { grid-column: 9 / 13; grid-row: span 3; }

/* --- Hero card enhancements (cards 1-2) --- */
.idea-card:nth-of-type(1),
.idea-card:nth-of-type(2) {
    padding: 2.5rem;
    border-radius: var(--radius-lg);
}
.idea-card:nth-of-type(1) .card-title,
.idea-card:nth-of-type(2) .card-title {
    font-size: 2.1rem;
}
.idea-card:nth-of-type(1) .card-desc,
.idea-card:nth-of-type(2) .card-desc {
    font-size: 1.05rem;
    max-width: 34rem;
    line-height: 1.75;
}

/* --- Wide card enhancement (card 7) --- */
.idea-card:nth-of-type(7) {
    padding: 2.5rem;
}
.idea-card:nth-of-type(7) .card-title { font-size: 1.8rem; }

/* --- Card inner elements --- */
.card-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.card-num {
    font-size: 0.65rem;
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--text-3);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.card-num span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px; height: 28px;
    border-radius: 8px;
    background: var(--card-accent, var(--brand-500));
    color: #fff;
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0;
}

.card-category {
    font-size: 0.6rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--card-accent, var(--brand-400));
    opacity: 0.7;
    padding: 0.25rem 0.6rem;
    border: 1px solid currentColor;
    border-radius: 100px;
}

.card-title {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1.25;
    margin-bottom: 0.5rem;
    transition: color 0.3s var(--ease);
}
.idea-card:hover .card-title { color: var(--card-accent, var(--brand-300)); }

.card-subtitle {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-2);
    margin-bottom: 0.85rem;
    line-height: 1.5;
}

.card-desc {
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--text-2);
    flex: 1;
}

.card-footer {
    display: flex; align-items: center; justify-content: space-between;
    margin-top: auto;
    padding-top: 1rem;
}

.card-tags {
    display: flex; gap: 0.35rem; flex-wrap: wrap;
}
.card-tag {
    font-size: 0.62rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--text-3);
    background: rgba(255,255,255,0.04);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    border: 1px solid rgba(255,255,255,0.04);
}

.card-read {
    font-size: 0.7rem;
    color: var(--text-3);
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.card-arrow {
    position: absolute;
    bottom: 1.75rem; right: 1.75rem;
    width: 36px; height: 36px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 10px;
    background: var(--card-accent, rgba(99,102,241,0.15));
    color: #fff;
    opacity: 0;
    transform: translateX(-8px) scale(0.9);
    transition: all 0.4s var(--ease-spring);
}
.idea-card:hover .card-arrow {
    opacity: 1;
    transform: translateX(0) scale(1);
}

/* --- Thread connector dots between rows --- */
.grid-thread {
    grid-column: 1 / -1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 0;
    gap: 0.5rem;
}
.grid-thread::before,
.grid-thread::after {
    content: '';
    flex: 1;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(99,102,241,0.12), transparent);
}
.grid-thread-label {
    font-size: 0.6rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--brand-400);
    opacity: 0.4;
    white-space: nowrap;
}

/* ============================================================
   CTA BAND
   ============================================================ */
.cta-band {
    position: relative; z-index: 1;
    text-align: center;
    max-width: 44rem; margin: 0 auto;
    padding: 5rem 2rem 6rem;
}
.cta-eyebrow {
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--brand-400);
    margin-bottom: 1.25rem;
}
.cta-text {
    font-family: var(--font-serif);
    font-size: clamp(1.5rem, 2.8vw, 2rem);
    line-height: 1.55;
    color: var(--text-2);
    margin-bottom: 2rem;
}
.cta-link {
    display: inline-block;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--brand-400);
    padding: 0.75rem 2rem;
    border: 1px solid var(--brand-600);
    border-radius: 100px;
    transition: all 0.3s var(--ease);
}
.cta-link:hover {
    background: var(--brand-600);
    color: #fff;
    border-color: var(--brand-500);
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
    position: relative; z-index: 1;
    display: flex; align-items: center; justify-content: space-between;
    padding: 2rem;
    border-top: 1px solid var(--border);
    font-size: 0.8rem;
    color: var(--text-3);
}
.footer-brand { font-weight: 600; }

/* ============================================================
   PRESENTATION OVERLAY
   ============================================================ */
.presentation {
    position: fixed; inset: 0;
    z-index: 1000;
    background: var(--bg-deep);
    display: flex; flex-direction: column;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s var(--ease), visibility 0.4s;
}
.presentation.active {
    opacity: 1;
    visibility: visible;
}

/* Chrome */
.pres-chrome {
    position: relative; z-index: 10;
    flex-shrink: 0;
}
.pres-top-bar {
    display: flex; align-items: center; justify-content: space-between;
    padding: 0.9rem 1.5rem;
}
.pres-back {
    display: flex; align-items: center; gap: 0.4rem;
    font-size: 0.82rem; font-weight: 500;
    color: var(--text-3);
    transition: color 0.2s;
}
.pres-back:hover { color: var(--text-1); }

.pres-counter {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-3);
    font-variant-numeric: tabular-nums;
}
.pres-slash { color: var(--text-3); opacity: 0.4; }

.pres-close-btn {
    font-size: 1.6rem;
    color: var(--text-3);
    line-height: 1;
    width: 36px; height: 36px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 50%;
    transition: all 0.2s;
}
.pres-close-btn:hover {
    color: var(--text-1);
    background: rgba(255,255,255,0.06);
}

/* Progress bar */
.pres-progress {
    height: 2px;
    background: rgba(255,255,255,0.06);
}
.pres-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--brand-500), var(--brand-400));
    transition: width 0.4s var(--ease);
    width: 0%;
}

/* Slide viewport */
.slide-viewport {
    flex: 1;
    display: flex; align-items: center; justify-content: center;
    padding: 2rem;
    overflow: hidden;
    position: relative;
}

/* Presentation nav arrows */
.pres-nav-arrows {
    position: fixed;
    left: 0; right: 0;
    top: 50%;
    transform: translateY(-50%);
    display: flex; justify-content: space-between;
    padding: 0 1rem;
    pointer-events: none;
    z-index: 1010;
}
.arrow-btn {
    pointer-events: auto;
    width: 48px; height: 48px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 50%;
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--border);
    color: var(--text-3);
    transition: all 0.25s var(--ease);
    backdrop-filter: blur(8px);
}
.arrow-btn:hover {
    background: rgba(255,255,255,0.08);
    color: var(--text-1);
    border-color: rgba(255,255,255,0.15);
}
.arrow-btn:disabled {
    opacity: 0.2;
    pointer-events: none;
}

/* Presentation footer */
.pres-footer-bar {
    flex-shrink: 0;
    display: flex; align-items: center; justify-content: space-between;
    padding: 0.8rem 1.5rem;
    font-size: 0.75rem;
    color: var(--text-3);
    border-top: 1px solid var(--border);
    z-index: 10;
}
.pres-brand { font-weight: 700; }
.pres-section-label {
    font-weight: 500;
    letter-spacing: 0.04em;
}

/* ============================================================
   SLIDE LAYOUTS
   ============================================================ */
.slide {
    width: 100%;
    max-width: 64rem;
    animation: slideFadeIn 0.5s var(--ease-out) forwards;
}

/* --- Title Slide --- */
.slide--title {
    text-align: center;
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
}
.slide--title .slide-num-label {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--slide-accent, var(--brand-400));
    margin-bottom: 1.5rem;
}
.slide--title .slide-main-title {
    font-family: var(--font-serif);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
}
.slide--title .slide-main-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.4rem);
    color: var(--text-2);
    font-weight: 400;
    max-width: 32rem;
    line-height: 1.5;
}

/* --- Statement Slide --- */
.slide--statement {
    text-align: center;
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    padding: 0 3rem;
}
.slide--statement .statement-text {
    font-family: var(--font-serif);
    font-size: clamp(1.6rem, 3.5vw, 2.6rem);
    font-weight: 400;
    font-style: italic;
    line-height: 1.45;
    color: var(--text-1);
    max-width: 48rem;
    position: relative;
}
.slide--statement .statement-text::before {
    content: '"';
    position: absolute;
    top: -0.4em; left: -0.5em;
    font-size: 4em;
    color: var(--slide-accent, var(--brand-500));
    opacity: 0.15;
    font-family: var(--font-serif);
    line-height: 1;
}
.slide--statement .statement-note {
    margin-top: 2rem;
    font-size: 0.95rem;
    color: var(--text-3);
    max-width: 30rem;
    line-height: 1.6;
}

/* --- Split Slide --- */
.slide--split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}
.slide--split .split-label {
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--slide-accent, var(--brand-400));
    margin-bottom: 1rem;
}
.slide--split .split-title {
    font-family: var(--font-serif);
    font-size: clamp(1.5rem, 2.5vw, 2rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}
.slide--split .split-body {
    font-size: 1.05rem;
    line-height: 1.75;
    color: var(--text-2);
}
.slide--split .split-visual {
    display: flex; flex-direction: column;
    gap: 1rem;
}
.slide--split .visual-card {
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 1.25rem 1.5rem;
    font-size: 0.95rem;
    color: var(--text-2);
    line-height: 1.55;
    position: relative;
    overflow: hidden;
}
.visual-card::before {
    content: '';
    position: absolute; left: 0; top: 0; bottom: 0;
    width: 3px;
    background: var(--slide-accent, var(--brand-500));
}
.visual-card strong {
    color: var(--text-1);
    font-weight: 600;
}

/* --- Points Slide --- */
.slide--points {
    display: flex; flex-direction: column;
    max-width: 50rem;
    margin: 0 auto;
}
.slide--points .points-label {
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--slide-accent, var(--brand-400));
    margin-bottom: 0.75rem;
}
.slide--points .points-title {
    font-family: var(--font-serif);
    font-size: clamp(1.5rem, 2.5vw, 2rem);
    font-weight: 700;
    line-height: 1.25;
    margin-bottom: 2rem;
}
.slide--points .points-list {
    list-style: none;
    display: flex; flex-direction: column;
    gap: 1rem;
}
.slide--points .point-item {
    display: flex; gap: 1rem;
    align-items: flex-start;
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 1.15rem 1.35rem;
    transition: background 0.3s var(--ease);
}
.point-item:hover {
    background: rgba(255,255,255,0.045);
}
.point-icon {
    flex-shrink: 0;
    width: 28px; height: 28px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 6px;
    background: rgba(99,102,241,0.12);
    color: var(--slide-accent, var(--brand-400));
    font-size: 0.85rem;
    font-weight: 700;
    margin-top: 2px;
}
.point-content {
    flex: 1;
}
.point-content strong {
    display: block;
    font-weight: 600;
    color: var(--text-1);
    margin-bottom: 0.25rem;
    font-size: 0.95rem;
}
.point-content span {
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--text-2);
}

/* --- BigStat Slide --- */
.slide--bigstat {
    text-align: center;
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
}
.slide--bigstat .bigstat-symbol {
    font-size: clamp(4rem, 12vw, 8rem);
    font-weight: 800;
    line-height: 1;
    color: var(--slide-accent, var(--brand-400));
    margin-bottom: 1.5rem;
    text-shadow: 0 0 80px rgba(99,102,241,0.3);
}
.slide--bigstat .bigstat-headline {
    font-family: var(--font-serif);
    font-size: clamp(1.4rem, 2.5vw, 2rem);
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 1rem;
    max-width: 36rem;
}
.slide--bigstat .bigstat-body {
    font-size: 1.05rem;
    line-height: 1.7;
    color: var(--text-2);
    max-width: 36rem;
}

/* --- Quote Slide --- */
.slide--quote {
    text-align: center;
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
}
.slide--quote .quote-text {
    font-family: var(--font-serif);
    font-size: clamp(1.5rem, 3vw, 2.4rem);
    font-style: italic;
    line-height: 1.45;
    max-width: 44rem;
    color: var(--text-1);
    position: relative;
    padding: 0 2rem;
}
.slide--quote .quote-text::before,
.slide--quote .quote-text::after {
    font-size: 3em;
    color: var(--slide-accent, var(--brand-500));
    opacity: 0.2;
    font-family: var(--font-serif);
    line-height: 1;
    position: absolute;
}
.slide--quote .quote-text::before {
    content: '\201C';
    top: -0.3em; left: -0.3em;
}
.slide--quote .quote-text::after {
    content: '\201D';
    bottom: -0.6em; right: -0.1em;
}
.slide--quote .quote-attr {
    margin-top: 2rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--slide-accent, var(--brand-400));
    letter-spacing: 0.06em;
}

/* --- Final Slide --- */
.slide--final {
    text-align: center;
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
}
.slide--final .final-text {
    font-family: var(--font-serif);
    font-size: clamp(1.8rem, 4vw, 3rem);
    font-weight: 700;
    line-height: 1.3;
    max-width: 40rem;
    background: linear-gradient(135deg, var(--text-1), var(--brand-300));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.slide--final .final-sub {
    margin-top: 1.5rem;
    font-size: 1rem;
    color: var(--text-3);
    max-width: 28rem;
    line-height: 1.6;
}
.slide--final .final-brand {
    margin-top: 2.5rem;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--brand-500);
}

/* --- Fullbleed Title (image behind text) --- */
.slide--title-fullbleed {
    text-align: center;
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    position: relative;
    min-height: 60vh;
}
.slide--title-fullbleed .fullbleed-bg {
    position: absolute; inset: 0;
    border-radius: var(--radius-lg);
    overflow: hidden;
}
.slide--title-fullbleed .fullbleed-bg img {
    width: 100%; height: 100%;
    object-fit: cover;
    opacity: 0.25;
    filter: blur(1px);
}
.slide--title-fullbleed .fullbleed-bg::after {
    content: '';
    position: absolute; inset: 0;
    background: linear-gradient(180deg, rgba(6,6,15,0.4) 0%, rgba(6,6,15,0.85) 100%);
}
.slide--title-fullbleed .slide-num-label,
.slide--title-fullbleed .slide-main-title,
.slide--title-fullbleed .slide-main-subtitle {
    position: relative; z-index: 1;
}
.slide--title-fullbleed .slide-num-label {
    font-size: 0.75rem; font-weight: 700;
    letter-spacing: 0.15em; text-transform: uppercase;
    color: var(--slide-accent, var(--brand-400));
    margin-bottom: 1.5rem;
}
.slide--title-fullbleed .slide-main-title {
    font-family: var(--font-serif);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700; line-height: 1.1;
    letter-spacing: -0.02em; margin-bottom: 1rem;
}
.slide--title-fullbleed .slide-main-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.4rem);
    color: var(--text-2); font-weight: 400;
    max-width: 32rem; line-height: 1.5;
}

/* --- Cinematic Statement (image bg with overlay text) --- */
.slide--cinematic {
    position: relative;
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    min-height: 55vh;
    border-radius: var(--radius-lg);
    overflow: hidden;
}
.slide--cinematic .cinematic-bg {
    position: absolute; inset: 0;
}
.slide--cinematic .cinematic-bg img {
    width: 100%; height: 100%;
    object-fit: cover;
    opacity: 0.2;
}
.slide--cinematic .cinematic-bg::after {
    content: '';
    position: absolute; inset: 0;
    background: radial-gradient(ellipse at center, transparent 20%, var(--bg-deep) 80%);
}
.slide--cinematic .statement-text,
.slide--cinematic .statement-note {
    position: relative; z-index: 1;
}
.slide--cinematic .statement-text {
    font-family: var(--font-serif);
    font-size: clamp(1.6rem, 3.5vw, 2.6rem);
    font-weight: 400; font-style: italic;
    line-height: 1.45; color: var(--text-1);
    max-width: 48rem; text-align: center;
}
.slide--cinematic .statement-note {
    margin-top: 2rem; font-size: 0.95rem;
    color: var(--text-3); max-width: 30rem;
    line-height: 1.6; text-align: center;
}

/* --- Manifesto (centered large type, no serif italic) --- */
.slide--manifesto {
    text-align: center;
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    padding: 0 2rem;
}
.slide--manifesto .manifesto-text {
    font-family: var(--font-sans);
    font-size: clamp(1.4rem, 3vw, 2.2rem);
    font-weight: 800; line-height: 1.5;
    letter-spacing: -0.01em;
    color: var(--text-1);
    max-width: 44rem;
}
.slide--manifesto .manifesto-text em {
    font-style: normal;
    color: var(--slide-accent, var(--brand-400));
}
.slide--manifesto .manifesto-note {
    margin-top: 2rem; font-size: 0.9rem;
    color: var(--text-3); max-width: 28rem;
    line-height: 1.6;
}

/* --- Image Left Split (asymmetric, image takes more space) --- */
.slide--split-image-left {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 3rem;
    align-items: center;
}
.slide--split-image-left .split-image-col img {
    width: 100%;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}
.slide--split-image-left .split-label {
    font-size: 0.7rem; font-weight: 700;
    letter-spacing: 0.12em; text-transform: uppercase;
    color: var(--slide-accent, var(--brand-400));
    margin-bottom: 1rem;
}
.slide--split-image-left .split-title {
    font-family: var(--font-serif);
    font-size: clamp(1.5rem, 2.5vw, 2rem);
    font-weight: 700; line-height: 1.2;
    margin-bottom: 1rem;
}
.slide--split-image-left .split-body {
    font-size: 1.05rem; line-height: 1.75;
    color: var(--text-2);
}

/* --- Horizontal Points (side-by-side cards) --- */
.slide--points-horizontal {
    display: flex; flex-direction: column;
    max-width: 64rem; margin: 0 auto;
}
.slide--points-horizontal .points-label {
    font-size: 0.7rem; font-weight: 700;
    letter-spacing: 0.12em; text-transform: uppercase;
    color: var(--slide-accent, var(--brand-400));
    margin-bottom: 0.75rem;
}
.slide--points-horizontal .points-title {
    font-family: var(--font-serif);
    font-size: clamp(1.5rem, 2.5vw, 2rem);
    font-weight: 700; line-height: 1.25;
    margin-bottom: 2rem;
}
.slide--points-horizontal .points-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
}
.slide--points-horizontal .point-card {
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    transition: background 0.3s var(--ease);
    display: flex; flex-direction: column; gap: 0.75rem;
}
.slide--points-horizontal .point-card:hover {
    background: rgba(255,255,255,0.045);
}
.slide--points-horizontal .point-card-icon {
    width: 36px; height: 36px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 10px;
    background: rgba(99,102,241,0.12);
    color: var(--slide-accent, var(--brand-400));
    font-size: 1rem; font-weight: 700;
}
.slide--points-horizontal .point-card strong {
    display: block; font-weight: 600;
    color: var(--text-1); font-size: 0.95rem;
}
.slide--points-horizontal .point-card span {
    font-size: 0.85rem; line-height: 1.6;
    color: var(--text-2);
}

/* --- Numbered Narrative (large number + text) --- */
.slide--narrative {
    display: flex;
    gap: 3rem;
    align-items: flex-start;
    max-width: 56rem;
    margin: 0 auto;
}
.slide--narrative .narrative-num {
    font-size: clamp(5rem, 10vw, 8rem);
    font-weight: 900;
    line-height: 1;
    color: var(--slide-accent, var(--brand-400));
    opacity: 0.15;
    flex-shrink: 0;
    font-family: var(--font-sans);
}
.slide--narrative .narrative-content {
    flex: 1;
    padding-top: 1rem;
}
.slide--narrative .narrative-label {
    font-size: 0.7rem; font-weight: 700;
    letter-spacing: 0.12em; text-transform: uppercase;
    color: var(--slide-accent, var(--brand-400));
    margin-bottom: 0.75rem;
}
.slide--narrative .narrative-title {
    font-family: var(--font-serif);
    font-size: clamp(1.5rem, 2.5vw, 2.2rem);
    font-weight: 700; line-height: 1.2;
    margin-bottom: 1rem;
}
.slide--narrative .narrative-body {
    font-size: 1.05rem; line-height: 1.75;
    color: var(--text-2);
    margin-bottom: 1.5rem;
}
.slide--narrative .narrative-cards {
    display: flex; flex-direction: column; gap: 0.75rem;
}
.slide--narrative .narrative-cards .visual-card {
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 1rem 1.25rem;
    font-size: 0.9rem;
    color: var(--text-2);
    line-height: 1.55;
    position: relative;
    overflow: hidden;
}
.slide--narrative .narrative-cards .visual-card::before {
    content: '';
    position: absolute; left: 0; top: 0; bottom: 0;
    width: 3px;
    background: var(--slide-accent, var(--brand-500));
}
.slide--narrative .narrative-cards .visual-card strong {
    color: var(--text-1); font-weight: 600;
}

@media (max-width: 768px) {
    .slide--split-image-left {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    .slide--points-horizontal .points-row {
        grid-template-columns: 1fr;
    }
    .slide--narrative {
        flex-direction: column;
        gap: 1rem;
    }
    .slide--narrative .narrative-num {
        font-size: 4rem;
    }
}

/* --- Wiki / Code elements inside slides --- */
.visual-card code, .point-content code, .split-body code,
.statement-note code, .bigstat-body code {
    font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
    font-size: 0.82em;
    background: rgba(99,102,241,0.12);
    color: var(--brand-300);
    padding: 0.15em 0.45em;
    border-radius: 4px;
    white-space: nowrap;
}

.visual-card--endpoint {
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 0.82rem;
    letter-spacing: -0.01em;
}
.visual-card--endpoint .ep-method {
    display: inline-block;
    font-weight: 700;
    font-size: 0.7rem;
    letter-spacing: 0.04em;
    padding: 0.15em 0.45em;
    border-radius: 3px;
    margin-right: 0.5em;
    text-transform: uppercase;
}
.ep-get    { background: rgba(20,184,166,0.15); color: #14b8a6; }
.ep-post   { background: rgba(99,102,241,0.15); color: #818cf8; }
.ep-put    { background: rgba(245,158,11,0.15); color: #f59e0b; }
.ep-delete { background: rgba(244,63,94,0.15);  color: #f43f5e; }

/* Endpoint group grid for the overview slide */
.slide--endpoints-grid {
    display: flex; flex-direction: column;
    max-width: 58rem; margin: 0 auto;
}
.slide--endpoints-grid .eg-label {
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--slide-accent, var(--brand-400));
    margin-bottom: 0.75rem;
}
.slide--endpoints-grid .eg-title {
    font-family: var(--font-serif);
    font-size: clamp(1.5rem, 2.5vw, 2rem);
    font-weight: 700;
    line-height: 1.25;
    margin-bottom: 1.5rem;
}
.eg-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 0.6rem;
}
.eg-item {
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.7rem 0.9rem;
    display: flex; align-items: center; gap: 0.6rem;
    font-size: 0.82rem;
    transition: background 0.2s;
}
.eg-item:hover { background: rgba(255,255,255,0.045); }
.eg-icon {
    width: 28px; height: 28px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 6px;
    background: rgba(99,102,241,0.1);
    color: var(--slide-accent, var(--brand-400));
    font-size: 0.75rem;
    font-weight: 700;
    flex-shrink: 0;
}
.eg-info { display: flex; flex-direction: column; gap: 0.1rem; }
.eg-name { font-weight: 600; color: var(--text-1); }
.eg-path {
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 0.72rem;
    color: var(--text-3);
}

/* Tech badge row */
.tech-badges {
    display: flex; flex-wrap: wrap; gap: 0.5rem;
    margin-top: 1rem;
}
.tech-badge {
    display: inline-flex; align-items: center; gap: 0.35rem;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-2);
    background: var(--glass);
    border: 1px solid var(--border);
    padding: 0.35rem 0.75rem;
    border-radius: 100px;
}
.tech-badge .badge-dot {
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--slide-accent, var(--brand-400));
}

/* Slide hero image / visual placeholder */
.slide-hero-img {
    width: 100%;
    max-height: 340px;
    object-fit: cover;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    margin-bottom: 1.5rem;
}
.slide-hero-placeholder {
    width: 100%;
    max-height: 340px;
    min-height: 200px;
    border-radius: var(--radius);
    border: 1px dashed rgba(99,102,241,0.25);
    background:
        linear-gradient(135deg, rgba(99,102,241,0.06) 0%, rgba(168,139,250,0.04) 50%, rgba(56,189,248,0.06) 100%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    color: var(--text-3);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    margin-bottom: 1.5rem;
    position: relative;
    overflow: hidden;
}
.slide-hero-placeholder::before {
    content: '';
    position: absolute;
    inset: 0;
    background: repeating-linear-gradient(
        -45deg,
        transparent,
        transparent 20px,
        rgba(99,102,241,0.03) 20px,
        rgba(99,102,241,0.03) 40px
    );
}
.slide-hero-placeholder .ph-icon {
    font-size: 2rem;
    opacity: 0.5;
    position: relative;
    z-index: 1;
}
.slide-hero-placeholder .ph-label {
    position: relative;
    z-index: 1;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}
.slide-hero-placeholder .ph-desc {
    position: relative;
    z-index: 1;
    color: var(--text-3);
    opacity: 0.7;
    font-size: 0.7rem;
    max-width: 280px;
    text-align: center;
    line-height: 1.5;
}

/* Visual card image support */
.visual-card-img {
    width: 100%;
    height: 140px;
    object-fit: cover;
    border-radius: 8px;
    border: 1px solid var(--border);
    margin-bottom: 0.6rem;
}
.visual-card-placeholder {
    width: 100%;
    height: 140px;
    border-radius: 8px;
    border: 1px dashed rgba(99,102,241,0.2);
    background: linear-gradient(135deg, rgba(99,102,241,0.05), rgba(168,139,250,0.03));
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    color: var(--text-3);
    font-size: 0.65rem;
    font-weight: 500;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    margin-bottom: 0.6rem;
}

/* Title slide hero image */
.title-hero-img {
    max-width: 480px;
    width: 90%;
    margin: 2rem auto 0;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}
.title-hero-placeholder {
    max-width: 480px;
    width: 90%;
    height: 260px;
    margin: 2rem auto 0;
    border-radius: var(--radius-lg);
    border: 1px dashed rgba(99,102,241,0.25);
    background: linear-gradient(135deg, rgba(99,102,241,0.06), rgba(168,139,250,0.04));
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    color: var(--text-3);
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}
.title-hero-placeholder .ph-icon { font-size: 2.5rem; opacity: 0.4; }

/* Role hierarchy bar */
.role-bar {
    display: flex; flex-wrap: wrap;
    gap: 0.25rem;
    margin-top: 0.75rem;
}
.role-chip {
    font-size: 0.7rem;
    font-weight: 600;
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--border);
    color: var(--text-3);
    position: relative;
}
.role-chip.role-highlight {
    background: rgba(99,102,241,0.12);
    border-color: rgba(99,102,241,0.3);
    color: var(--brand-300);
}
.role-arrow {
    font-size: 0.65rem;
    color: var(--text-3);
    opacity: 0.4;
    display: flex; align-items: center;
}

/* ============================================================
   CONTRIBUTE SECTION
   ============================================================ */
.contribute-section {
    padding: 6rem 2rem;
    display: flex;
    justify-content: center;
}
.contribute-inner {
    max-width: 40rem;
    text-align: center;
}
.contribute-badge {
    display: inline-block;
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--brand-400);
    border: 1px solid rgba(99,102,241,0.25);
    padding: 0.35rem 1rem;
    border-radius: 100px;
    margin-bottom: 1.5rem;
}
.contribute-title {
    font-family: var(--font-serif);
    font-size: clamp(1.8rem, 3vw, 2.4rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.25rem;
    letter-spacing: -0.01em;
}
.contribute-desc {
    font-size: 1.15rem;
    line-height: 1.7;
    color: var(--text-2);
    margin-bottom: 2.5rem;
}
.contribute-criteria {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    text-align: left;
    margin-bottom: 2.5rem;
}
.criteria-item {
    display: flex;
    align-items: flex-start;
    gap: 1.25rem;
    padding: 1.25rem 1.5rem;
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: background 0.3s var(--ease);
}
.criteria-item:hover {
    background: rgba(255,255,255,0.04);
}
.criteria-num {
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--brand-400);
    letter-spacing: 0.1em;
    padding-top: 0.15rem;
    flex-shrink: 0;
}
.criteria-item strong {
    display: block;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-1);
    margin-bottom: 0.25rem;
}
.criteria-item span {
    font-size: 0.85rem;
    color: var(--text-3);
    line-height: 1.5;
}
.contribute-cta {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--brand-300);
    border: 1px solid rgba(99,102,241,0.3);
    padding: 0.75rem 2rem;
    border-radius: var(--radius);
    text-decoration: none;
    transition: all 0.3s var(--ease);
    margin-bottom: 1.5rem;
}
.contribute-cta:hover {
    border-color: rgba(99,102,241,0.5);
    background: rgba(99,102,241,0.06);
}
.contribute-note {
    font-size: 0.75rem;
    color: var(--text-3);
    opacity: 0.6;
    line-height: 1.6;
    max-width: 30rem;
    margin: 0 auto;
}

/* ============================================================
   ANIMATIONS
   ============================================================ */
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(18px); }
    to   { opacity: 1; transform: translateY(0); }
}
@keyframes slideFadeIn {
    from { opacity: 0; transform: translateY(12px) scale(0.99); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes bobDown {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(5px); }
}

/* Card stagger animation */
.idea-card {
    opacity: 0;
    animation: fadeUp 0.6s var(--ease-out) forwards;
}
.idea-card:nth-of-type(1) { animation-delay: 0.1s; }
.idea-card:nth-of-type(2) { animation-delay: 0.2s; }
.idea-card:nth-of-type(3) { animation-delay: 0.3s; }
.idea-card:nth-of-type(4) { animation-delay: 0.35s; }
.idea-card:nth-of-type(5) { animation-delay: 0.4s; }
.idea-card:nth-of-type(6) { animation-delay: 0.45s; }
.idea-card:nth-of-type(7) { animation-delay: 0.5s; }
.idea-card:nth-of-type(8) { animation-delay: 0.55s; }
.idea-card:nth-of-type(9) { animation-delay: 0.6s; }
.idea-card:nth-of-type(10) { animation-delay: 0.65s; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
    .ideas-grid {
        grid-template-columns: repeat(6, 1fr);
    }
    .idea-card:nth-of-type(1)  { grid-column: 1 / 4;  grid-row: span 3; }
    .idea-card:nth-of-type(2)  { grid-column: 4 / 7;  grid-row: span 3; }
    .idea-card:nth-of-type(3)  { grid-column: 1 / 4;  grid-row: span 3; }
    .idea-card:nth-of-type(4)  { grid-column: 4 / 7;  grid-row: span 3; }
    .idea-card:nth-of-type(5)  { grid-column: 1 / 4;  grid-row: span 3; }
    .idea-card:nth-of-type(6)  { grid-column: 4 / 7;  grid-row: span 3; }
    .idea-card:nth-of-type(7)  { grid-column: 1 / 7;  grid-row: span 3; }
    .idea-card:nth-of-type(8)  { grid-column: 1 / 4;  grid-row: span 3; }
    .idea-card:nth-of-type(9)  { grid-column: 4 / 7;  grid-row: span 3; }
    .idea-card:nth-of-type(10) { grid-column: 1 / 7;  grid-row: span 3; }
    .idea-card:nth-of-type(1) .card-title,
    .idea-card:nth-of-type(2) .card-title { font-size: 1.5rem; }
    .grid-thread { display: none; }
}

@media (max-width: 768px) {
    .site-header { padding: 1rem 1.25rem; }
    .hero { padding: 7rem 1.25rem 3rem; min-height: 70vh; }
    .ideas { padding: 1rem 1.25rem 4rem; }
    .ideas-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    .idea-card,
    .idea-card:nth-child(n) {
        grid-column: 1 / -1 !important;
        grid-row: span 1 !important;
    }
    .idea-card::after { font-size: 5rem; }
    .grid-thread { display: none; }

    .slide--split {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .pres-nav-arrows { padding: 0 0.5rem; }
    .arrow-btn { width: 40px; height: 40px; }
    .slide-viewport { padding: 1.5rem 1rem; }

    .slide--statement { padding: 0 1rem; }
    .slide--statement .statement-text::before { display: none; }
}

@media (max-width: 480px) {
    .hero-title { font-size: 2rem; }
    .card-footer { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
}

/* ============================================================
   UTILITY: body lock when presentation is open
   ============================================================ */
body.pres-open {
    overflow: hidden;
}