/* ═══════════════════════════════════════
   SPIF 1.0 — Stylesheet
   Muted lavender + cornflower on monotone.
   Cinematic then dense.
═══════════════════════════════════════ */

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

:root {
    --bg:        #0c0c0e;
    --bg-2:      #111114;
    --bg-3:      #18181d;
    --accent:    #a89bc2;          /* dusty lavender */
    --accent-2:  #7b9ec9;          /* washed cornflower blue */
    --accent-glow: rgba(168, 155, 194, 0.12);
    --accent-2-glow: rgba(123, 158, 201, 0.12);
    --text:      #f0eff4;          /* near-white with faint violet cast */
    --text-dim:  #8b8899;          /* muted mid-gray, slight purple */
    --text-faint:#3a3845;          /* dark, barely visible */
    --border:    rgba(255,255,255,0.06);
    --border-accent: rgba(168, 155, 194, 0.18);
    --font-display: 'Syne', sans-serif;
    --font-body:    'Space Grotesk', sans-serif;
    --font-mono:    'Space Mono', monospace;
    --max-w: 1100px;
    --section-pad: 120px 40px;
}

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

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-body);
    line-height: 1.7;
    overflow-x: hidden;
}

::selection { background: var(--accent); color: var(--bg); }

/* ── Subtle grain texture overlay ────── */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='1'/%3E%3C/svg%3E");
    background-repeat: repeat;
    background-size: 180px 180px;
    opacity: 0.022;
    mix-blend-mode: overlay;
}

/* ── Typography ───────────────────────── */
h1, h2, h3, h4 { font-family: var(--font-display); line-height: 1.1; }
p { color: var(--text-dim); }
em { color: var(--text); font-style: italic; }
a { color: var(--accent); text-decoration: none; }

.section-label {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 20px;
    opacity: 0.8;
}

.section-title {
    font-size: clamp(28px, 4vw, 52px);
    font-weight: 800;
    color: var(--text);
    margin-bottom: 48px;
    max-width: 800px;
    letter-spacing: -0.02em;
}

.section-inner {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: var(--section-pad);
}

/* ── Nav ──────────────────────────────── */
#nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 40px;
    background: transparent;
    transition: background 0.3s, backdrop-filter 0.3s;
}

#nav.scrolled {
    background: rgba(12, 12, 14, 0.88);
    backdrop-filter: blur(20px) saturate(1.4);
    border-bottom: 1px solid var(--border);
}

.nav-logo {
    font-family: var(--font-mono);
    font-size: 18px;
    font-weight: 700;
    color: var(--text);
    letter-spacing: 0.1em;
}

.nav-version {
    color: var(--accent);
    font-size: 12px;
    vertical-align: super;
    margin-left: 2px;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 32px;
    align-items: center;
}

.nav-links a {
    font-size: 13px;
    color: var(--text-dim);
    letter-spacing: 0.05em;
    transition: color 0.2s;
}

.nav-links a:hover { color: var(--text); }

.nav-cta {
    color: var(--accent) !important;
    border: 1px solid var(--accent);
    padding: 8px 18px;
    border-radius: 4px;
    transition: background 0.2s !important;
}

.nav-cta:hover {
    background: var(--accent-glow) !important;
    color: var(--accent) !important;
}

/* ── Hero scroll wrapper — tall so sticky hero pins during transition ── */
#hero-scroll-wrapper {
    /* 100vh for the initial view + 120vh of scroll distance for the transition */
    height: 220vh;
    position: relative;
}

/* ── Hero ─────────────────────────────── */
#hero {
    position: sticky;
    top: 0;
    height: 100vh;
    min-height: unset;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    gap: 0;
    padding: 40px 40px 60px;
    background: var(--bg);
    overflow: hidden;
    box-sizing: border-box;
}

/* title block */
.hero-header {
    text-align: center;
    position: relative;
    z-index: 2;
    flex-shrink: 0;
    padding-bottom: 0px;
    padding-top: 36px;
}

/* video/CAD box — fills remaining viewport height below title */
.machine-stage {
    position: relative;
    width: calc(100% - 48px);
    max-width: 1400px;
    flex: 1 1 0;
    min-height: 0;
    border-radius: 12px;
    overflow: hidden;
    margin: 0 auto;
    z-index: 2;
    box-shadow: 0 0 0 1px var(--border), 0 32px 80px rgba(0,0,0,0.6);
    transition: border-radius 0.4s, box-shadow 0.4s;
}
.machine-stage.cad-mode {
    border-radius: 0;
    box-shadow: none;
    overflow: visible;
}

#spif-video {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    display: block;
}

.stage-hint {
    position: absolute;
    bottom: 16px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    transition: opacity 0.4s;
    z-index: 3;
}

.stage-hint span {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: rgba(240,239,244,0.5);
}

/* hero footer band — below scroll wrapper, normal flow */
.hero-footer-band {
    text-align: center;
    padding: 64px 40px;
    background: var(--bg);
}

/* 3D viewer — transparent canvas, CAD floats on page bg */
#spif-3d-container {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 2;
    opacity: 0;
    pointer-events: none;
    transition: none;
    overflow: visible;
    background: transparent;
}

#spif-3d-container canvas {
    display: block;
    width: 100% !important;
    height: 100% !important;
    background: transparent !important;
}

/* ── Component label bar — lives below the 3D canvas ── */
#component-labels {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    padding: 8px 40px 8px;
    pointer-events: none;
    z-index: 2;
    position: relative;
}

.component-label {
    cursor: pointer;
    pointer-events: none;
    transition: opacity 0.25s;
    white-space: nowrap;
    user-select: none;
}

.cl-name {
    display: block;
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--label-color, var(--text));
    background: rgba(12, 12, 14, 0.75);
    border: 1px solid var(--label-color, rgba(168,155,194,0.35));
    padding: 6px 14px;
    border-radius: 4px;
    backdrop-filter: blur(10px);
    transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.component-label:hover .cl-name {
    background: color-mix(in srgb, var(--label-color, #a89bc2) 15%, transparent);
    color: #fff;
}

/* ── Component info panel ─────────────── */
#spif-info-panel {
    position: absolute;
    top: 50%;
    right: 40px;
    transform: translateY(-50%) translateX(40px);
    width: 300px;
    background: rgba(12, 12, 14, 0.88);
    border: 1px solid rgba(168, 155, 194, 0.22);
    border-radius: 8px;
    padding: 28px 28px 24px;
    backdrop-filter: blur(20px);
    z-index: 10;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.35s, transform 0.35s;
}

#spif-info-panel.visible {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(-50%) translateX(0);
}

#info-close {
    position: absolute;
    top: 14px;
    right: 16px;
    background: none;
    border: none;
    color: var(--text-dim);
    font-size: 14px;
    cursor: pointer;
    padding: 4px 6px;
    line-height: 1;
    transition: color 0.2s;
}

#info-close:hover { color: var(--text); }

.ip-nav {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 18px;
}

.ip-nav button {
    background: none;
    border: 1px solid rgba(168, 155, 194, 0.22);
    color: var(--text-dim);
    font-size: 14px;
    cursor: pointer;
    padding: 4px 10px;
    border-radius: 3px;
    line-height: 1;
    transition: border-color 0.2s, color 0.2s;
}

.ip-nav button:hover {
    border-color: rgba(168, 155, 194, 0.6);
    color: var(--text);
}

.ip-nav-index {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.15em;
    color: var(--text-dim);
}

.ip-label {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 10px;
}

.ip-name {
    font-size: 20px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 14px;
    line-height: 1.2;
}

.ip-desc {
    font-size: 13px;
    color: var(--text-dim);
    line-height: 1.7;
}

.hero-eyebrow {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 24px;
    opacity: 0;
    animation: fadeUp 0.8s 0.2s forwards;
}

.hero-title {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 16px;
    margin-bottom: 12px;
    opacity: 0;
    animation: fadeUp 0.8s 0.4s forwards;
}

.title-spif {
    font-size: clamp(72px, 14vw, 160px);
    font-weight: 800;
    /* Two-tone gradient: lavender → cornflower */
    background: linear-gradient(115deg, #f0eff4 20%, #a89bc2 55%, #7b9ec9 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.04em;
    line-height: 1;
}

.title-version {
    font-family: var(--font-mono);
    font-size: clamp(18px, 3vw, 36px);
    color: var(--accent-2);
    font-weight: 400;
    letter-spacing: 0.1em;
    align-self: flex-end;
    margin-bottom: 12px;
}

.hero-sub {
    font-family: var(--font-mono);
    font-size: clamp(11px, 1.5vw, 14px);
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--text-dim);
    margin-bottom: 28px;
    opacity: 0;
    animation: fadeUp 0.8s 0.6s forwards;
}

.hero-tagline {
    font-size: clamp(14px, 1.6vw, 18px);
    color: var(--text-dim);
    white-space: nowrap;
    margin: 0 auto 20px;
    line-height: 1.6;
    opacity: 0;
    animation: fadeUp 0.8s 0.8s forwards;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    margin-bottom: 0;
    opacity: 0;
    animation: fadeUp 0.8s 1s forwards;
    flex-wrap: wrap;
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0 36px;
}

.stat-val {
    font-family: var(--font-mono);
    font-size: clamp(20px, 3vw, 32px);
    font-weight: 700;
    color: var(--accent);
    line-height: 1;
    margin-bottom: 6px;
}

.stat-label {
    font-size: 11px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-faint);
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--border);
    flex-shrink: 0;
}

.scroll-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    opacity: 0;
    animation: fadeUp 0.8s 1.2s forwards;
}

.scroll-indicator span {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--text-faint);
}

.scroll-arrow {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--text-faint), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
}

/* ── Problem Section ──────────────────── */
#problem {
    background: var(--bg-2);
    background-image: radial-gradient(ellipse 60% 40% at 80% 20%, rgba(168,155,194,0.04) 0%, transparent 70%);
    position: relative;
}

#problem::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(to right, transparent, var(--border), transparent);
}

.problem-narrative {
    margin-bottom: 60px;
}

.pull-quote {
    font-size: clamp(18px, 2.5vw, 26px) !important;
    color: var(--text) !important;
    line-height: 1.5;
    font-weight: 300;
    border-left: 2px solid var(--accent);
    padding-left: 28px;
    max-width: 680px;
}

.timeline-progress {
    display: flex;
    flex-direction: column;
    gap: 0;
    margin-bottom: 60px;
    border-left: 1px solid var(--border);
    padding-left: 40px;
    margin-left: 20px;
}

.tp-item {
    position: relative;
    padding: 32px 0 32px 0;
    border-bottom: 1px solid var(--border);
}

.tp-item:last-child { border-bottom: none; }

.tp-item::before {
    content: '';
    position: absolute;
    left: -45px;
    top: 38px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--text-faint);
    border: 2px solid var(--bg-2);
}

.tp-inflection::before { background: var(--accent-2); }
.tp-breakthrough::before { background: var(--accent); box-shadow: 0 0 14px rgba(168,155,194,0.5); }

.tp-year {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent);
    display: block;
    margin-bottom: 8px;
}

.tp-item h4 {
    font-size: 18px;
    color: var(--text);
    margin-bottom: 10px;
    font-weight: 700;
}

.tp-item p {
    font-size: 15px;
    max-width: 680px;
    line-height: 1.7;
}

.tp-breakthrough h4 { color: var(--accent); }

.problem-bridge {
    text-align: center;
    padding: 60px 0 20px;
}

.problem-bridge p {
    font-family: var(--font-display);
    font-size: clamp(22px, 3.5vw, 40px);
    color: var(--text);
    font-weight: 800;
}

/* ── Science Section ──────────────────── */
#science {
    background: var(--bg);
    background-image: radial-gradient(ellipse 50% 50% at 10% 60%, rgba(123,158,201,0.04) 0%, transparent 70%);
}

.science-intro {
    margin-bottom: 60px;
}

.science-intro p {
    font-size: clamp(16px, 2vw, 20px);
    color: var(--text-dim);
    max-width: 620px;
    line-height: 1.7;
}

.science-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 2px;
    margin-bottom: 80px;
    background: var(--border);
}

.science-card {
    background: var(--bg);
    padding: 40px 32px;
    position: relative;
    transition: background 0.3s;
}

.science-card:hover { background: var(--bg-3); }

.sc-number {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-faint);
    letter-spacing: 0.15em;
    margin-bottom: 24px;
}

.sc-icon {
    width: 48px;
    height: 48px;
    color: var(--accent);
    margin-bottom: 20px;
    opacity: 0.7;
}

.science-card h3 {
    font-size: 18px;
    color: var(--text);
    margin-bottom: 14px;
    font-weight: 700;
}

.science-card p {
    font-size: 14px;
    line-height: 1.7;
    color: var(--text-dim);
}

/* Pipeline */
.science-pipeline {
    background: var(--bg-3);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 48px;
}

.science-pipeline h3 {
    font-size: 22px;
    color: var(--text);
    margin-bottom: 8px;
}

.pipeline-sub {
    font-size: 14px;
    color: var(--text-faint);
    margin-bottom: 40px;
    font-family: var(--font-mono);
}

.pipeline-steps {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    flex-wrap: wrap;
}

.ps-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    flex: 1;
    min-width: 120px;
    gap: 10px;
}

.ps-icon {
    font-family: var(--font-mono);
    font-size: 20px;
    color: var(--accent);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--accent);
    border-radius: 50%;
}

.ps-text {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.ps-text strong {
    font-size: 13px;
    color: var(--text);
    font-weight: 600;
}

.ps-text span {
    font-size: 11px;
    color: var(--text-faint);
    line-height: 1.4;
}

.ps-arrow {
    color: var(--text-faint);
    font-size: 18px;
    align-self: center;
    flex-shrink: 0;
    padding-bottom: 24px;
}

/* ── Vision Section ───────────────────── */
#vision {
    background: var(--bg-2);
    background-image:
        radial-gradient(ellipse 70% 60% at 50% 0%, rgba(168,155,194,0.05) 0%, transparent 65%),
        radial-gradient(ellipse 40% 40% at 90% 80%, rgba(123,158,201,0.04) 0%, transparent 60%);
    position: relative;
    overflow: hidden;
}

#vision::after {
    content: 'SPIF';
    position: absolute;
    right: -60px;
    top: 50%;
    transform: translateY(-50%);
    font-family: var(--font-display);
    font-size: 300px;
    font-weight: 800;
    color: rgba(255,255,255,0.02);
    pointer-events: none;
    letter-spacing: -0.05em;
    line-height: 1;
    z-index: 0;
}

.vision-statement {
    position: relative;
    z-index: 1;
    margin-bottom: 60px;
}

.vision-statement p {
    font-size: clamp(16px, 2vw, 20px);
    color: var(--text-dim);
    max-width: 680px;
    line-height: 1.7;
}

.vision-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    align-items: stretch;
    position: relative;
    z-index: 1;
}

.vision-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 36px 32px;
    transition: border-color 0.3s, transform 0.3s;
    display: flex;
    flex-direction: column;
    align-self: stretch;
    height: 100%;
}

.vision-card:hover {
    border-color: rgba(168, 155, 194, 0.3);
    transform: translateY(-4px);
}

.vision-card h3 {
    font-size: 17px;
    color: var(--text);
    margin-bottom: 14px;
    font-weight: 700;
}

.vision-card p {
    font-size: 14px;
    line-height: 1.7;
    color: var(--text-dim);
    margin-bottom: 24px;
    flex: 1;
}

.vision-metric {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
}

.vm-val {
    font-family: var(--font-mono);
    font-size: 24px;
    color: var(--accent);
    font-weight: 700;
}

.vm-label {
    font-size: 11px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-faint);
}

/* ── Build Section ────────────────────── */
#build {
    background: var(--bg);
    background-image: radial-gradient(ellipse 60% 50% at 100% 30%, rgba(168,155,194,0.03) 0%, transparent 70%);
}

.build-intro {
    margin-bottom: 60px;
}

.build-intro p {
    font-size: clamp(16px, 2vw, 19px);
    color: var(--text-dim);
    max-width: 620px;
    line-height: 1.7;
}

/* ── Scroll-in photos — absolute inside their section, zero layout impact ── */
.scroll-photo {
    position: absolute;
    border-radius: 10px;
    border: 1px solid var(--border-accent);
    box-shadow: 0 24px 64px rgba(0,0,0,0.7);
    pointer-events: none;
    z-index: 10;
    will-change: transform;
}

/* Image 1 — corner, right-anchored */
.scroll-photo--right { width: clamp(380px, 38vw, 620px); right: 80px; }
.scroll-photo--left  { width: clamp(380px, 38vw, 620px); left: 80px; }

/* Images 2 & 3 — wide centrepieces, overrides left/right positioning */
.scroll-photo--center { width: clamp(380px, 42vw, 660px); left: 50%; right: auto; }

/* Sections clip their absolute photo children */
#build, #state { position: relative; overflow: hidden; }

/* Extra bottom room = image height (42vw wide, ~0.65 aspect) + 40px gap above + 40px below */
#build { padding-bottom: clamp(340px, 29vw, 520px); }
#state { padding-bottom: clamp(340px, 29vw, 520px); }


.discoveries { margin-bottom: 80px; }

.discoveries-title {
    font-size: 22px;
    color: var(--text);
    margin-bottom: 40px;
    font-weight: 700;
}

.discovery-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.discovery {
    display: flex;
    gap: 32px;
    padding: 36px 40px;
    background: var(--bg-2);
    border-left: 2px solid transparent;
    transition: border-color 0.3s, background 0.3s;
}

.discovery:hover {
    border-left-color: var(--accent);
    background: var(--bg-3);
}

.d-marker {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent);
    flex-shrink: 0;
    margin-top: 10px;
    box-shadow: 0 0 10px rgba(168,155,194,0.4);
}

.d-content h4 {
    font-size: 16px;
    color: var(--text);
    margin-bottom: 10px;
    font-weight: 700;
}

.d-content p {
    font-size: 14px;
    line-height: 1.75;
    max-width: 700px;
}

/* Build Timeline */
.build-timeline h3 {
    font-size: 22px;
    color: var(--text);
    margin-bottom: 40px;
    font-weight: 700;
}

.bt-track {
    display: flex;
    flex-direction: column;
    gap: 0;
    border-left: 1px solid var(--border);
    padding-left: 40px;
    margin-left: 20px;
}

.bt-item {
    position: relative;
    padding: 20px 0;
    display: grid;
    grid-template-columns: 140px 1fr;
    gap: 24px;
    align-items: start;
}

.bt-dot {
    position: absolute;
    left: -45px;
    top: 26px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-faint);
    border: 2px solid var(--bg);
}

.bt-dot.active {
    background: var(--accent);
    box-shadow: 0 0 10px rgba(168,155,194,0.6);
}

.bt-label {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--accent);
    letter-spacing: 0.05em;
    padding-top: 2px;
}

.bt-desc {
    font-size: 14px;
    color: var(--text-dim);
    line-height: 1.6;
}

/* ── State Section ────────────────────── */
#state {
    background: var(--bg-2);
}

.state-honest {
    margin-bottom: 52px;
}

.state-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2px;
    background: var(--border);
    margin-bottom: 60px;
}

.state-card {
    background: var(--bg-2);
    padding: 40px 36px;
    position: relative;
}

.sc-tag {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    padding: 4px 10px;
    border-radius: 2px;
    display: inline-block;
    margin-bottom: 20px;
}

.state-proven .sc-tag { background: rgba(168, 155, 194, 0.1); color: var(--accent); }
.state-active .sc-tag  { background: rgba(123, 158, 201, 0.1); color: var(--accent-2); }
.state-next .sc-tag    { background: rgba(240, 239, 244, 0.06); color: var(--text-dim); }

.state-card h4 {
    font-size: 17px;
    color: var(--text);
    margin-bottom: 14px;
    font-weight: 700;
}

.state-card p {
    font-size: 14px;
    line-height: 1.75;
}

.state-cta {
    text-align: center;
    padding: 20px 0;
}

.state-cta p {
    font-size: clamp(15px, 2vw, 18px);
    color: var(--text-dim);
    max-width: 620px;
    margin: 0 auto;
    line-height: 1.7;
}

/* ── References Page ─────────────────── */
#references-page { background: var(--bg); }

.ref-group {
    margin-bottom: 64px;
}

.ref-group-label {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}

.ref-item {
    display: flex;
    align-items: baseline;
    gap: 24px;
    padding: 16px 0;
    border-bottom: 1px solid var(--border);
}

.ref-num {
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--text-faint);
    letter-spacing: 0.1em;
    flex-shrink: 0;
    width: 24px;
}

.ref-body {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.ref-body a {
    font-size: 14px;
    color: var(--text);
    transition: color 0.2s;
    line-height: 1.5;
}

.ref-body a:hover { color: var(--accent); }

.ref-nolink {
    font-size: 14px;
    color: var(--text);
    line-height: 1.5;
}

.ref-source {
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--text-dim);
    letter-spacing: 0.08em;
}

/* ── Follow Section ───────────────────── */
#follow {
    background: var(--bg);
    border-top: 1px solid var(--border);
}

.follow-inner {
    text-align: center;
}

.follow-inner .section-title {
    margin: 0 auto 20px;
    text-align: center;
}

.follow-sub {
    font-size: 17px;
    color: var(--text-dim);
    max-width: 540px;
    margin: 0 auto 48px;
    line-height: 1.7;
}

.follow-links {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 60px;
    flex-wrap: wrap;
}

.follow-btn {
    font-family: var(--font-mono);
    font-size: 13px;
    letter-spacing: 0.1em;
    padding: 14px 36px;
    border-radius: 4px;
    background: var(--accent);
    color: var(--bg);
    font-weight: 700;
    transition: opacity 0.2s, transform 0.2s;
}

.follow-btn:hover { opacity: 0.85; transform: translateY(-2px); }

.follow-btn-outline {
    background: transparent;
    color: var(--accent);
    border: 1px solid var(--accent);
}

.follow-credit {
    padding-top: 40px;
    border-top: 1px solid var(--border);
}

.follow-credit p {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.1em;
    color: var(--text-faint);
}

/* ── Scroll Reveal ────────────────────── */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ── Animations ───────────────────────── */
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(24px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes scrollPulse {
    0%, 100% { opacity: 0.3; transform: scaleY(1); }
    50%       { opacity: 0.8; transform: scaleY(1.1); }
}

/* ── Responsive ───────────────────────── */
@media (max-width: 860px) {
    .scroll-photo { display: none; }
}

@media (max-width: 768px) {
    :root { --section-pad: 80px 24px; }

    #nav { padding: 16px 24px; }
    .nav-links { display: none; }

    .hero-header { padding: 0 24px; }
    .hero-footer { padding: 0 24px; }
    .machine-stage { width: calc(100% - 24px); }

    .component-label { display: none; }
    #spif-info-panel { right: 16px; width: calc(100vw - 32px); top: auto; bottom: 20px; transform: translateY(20px); }
    #spif-info-panel.visible { transform: translateY(0); top: auto; }

    .hero-stats { gap: 12px; }
    .stat { padding: 0 16px; }
    .stat-divider { display: none; }

    .timeline-progress { padding-left: 24px; margin-left: 12px; }
    .tp-item::before { left: -29px; }

    .pipeline-steps { flex-direction: column; align-items: flex-start; }
    .ps-step { flex-direction: row; text-align: left; min-width: unset; }
    .ps-arrow { transform: rotate(90deg); align-self: unset; padding-bottom: 0; padding-left: 12px; }

    .science-pipeline { padding: 32px 24px; }

    .discovery { padding: 28px 24px; gap: 20px; }

    .bt-item { grid-template-columns: 120px 1fr; gap: 16px; }

    .bt-track { padding-left: 24px; margin-left: 12px; }
    .bt-dot { left: -29px; }

    #vision::after { display: none; }
}