:root {
  --primary: #2476d8;
  --primary-dark: #1454a2;
  --primary-light: #6aa9f0;
  --accent: #8b63d8;
  --orange: #f48335;
  --orange-dark: #d95f12;
  --ink: #172033;
  --text: #33405a;
  --muted: #6d7890;
  --line: #e2e7f0;
  --surface: #ffffff;
  --surface-soft: #f7f9fd;
  --surface-blue: #eef5fd;
  --surface-warm: #fff5ed;
  --shadow-sm: 0 6px 20px rgba(26, 46, 78, 0.06);
  --shadow: 0 18px 50px rgba(31, 60, 105, 0.10);
  --radius-sm: 10px;
  --radius: 18px;
  --radius-lg: 28px;
  --max-width: 1200px;
  --transition: 220ms ease;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 82px; }
body {
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--surface);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { font: inherit; }
.container { width: min(var(--max-width), calc(100% - 48px)); margin: 0 auto; }

.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 1000;
  background: rgba(255,255,255,.82);
  border-bottom: 1px solid rgba(226,231,240,.75);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  transition: box-shadow var(--transition), background var(--transition);
}
.nav.scrolled { background: rgba(255,255,255,.94); box-shadow: 0 8px 30px rgba(26,46,78,.08); }
.nav-container { width: min(var(--max-width), calc(100% - 48px)); height: 74px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; }
.nav-logo, .footer-brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 750; letter-spacing: -.02em; }
.nav-logo { font-size: 1.05rem; }
.logo-mark { width: 30px; height: 30px; border-radius: 50%; position: relative; display: inline-block; background: linear-gradient(135deg, rgba(36,118,216,.16), rgba(244,131,53,.15)); border: 1px solid rgba(36,118,216,.18); }
.logo-mark::before, .logo-mark::after { content: ""; position: absolute; border-radius: 999px; transform: rotate(-16deg); }
.logo-mark::before { left: 5px; top: 14px; width: 20px; height: 2px; background: linear-gradient(90deg, var(--primary), var(--orange)); }
.logo-mark::after { right: 4px; top: 9px; width: 5px; height: 5px; background: var(--orange); box-shadow: -8px 4px 0 var(--primary-light), -15px 8px 0 var(--primary); }
.nav-links { display: flex; list-style: none; align-items: center; gap: 28px; }
.nav-links a { position: relative; color: var(--muted); font-size: .88rem; font-weight: 550; transition: color var(--transition); }
.nav-links a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: -8px; height: 2px; background: linear-gradient(90deg, var(--primary), var(--orange)); transition: right var(--transition); }
.nav-links a:hover, .nav-links a.active { color: var(--primary-dark); }
.nav-links a:hover::after, .nav-links a.active::after { right: 0; }
.nav-toggle { display: none; width: 40px; height: 40px; border: 0; background: transparent; flex-direction: column; align-items: center; justify-content: center; gap: 5px; cursor: pointer; }
.nav-toggle span { width: 22px; height: 2px; background: var(--ink); transition: var(--transition); }

.hero { min-height: 100vh; position: relative; display: flex; align-items: center; overflow: hidden; padding: 128px 0 96px; }
.hero-bg { position: absolute; inset: 0; z-index: -3; background:
  radial-gradient(circle at 15% 18%, rgba(36,118,216,.15), transparent 34%),
  radial-gradient(circle at 84% 72%, rgba(244,131,53,.11), transparent 34%),
  linear-gradient(180deg, #fff 0%, #f8fbff 58%, #f5f8fd 100%); }
.hero-bg::after { content: ""; position: absolute; inset: 0; opacity: .5; background-image: linear-gradient(rgba(60,90,135,.04) 1px, transparent 1px), linear-gradient(90deg, rgba(60,90,135,.04) 1px, transparent 1px); background-size: 32px 32px; mask-image: linear-gradient(to bottom, black, transparent 82%); }
.trajectory-orbit { position: absolute; z-index: -1; border: 1px solid rgba(36,118,216,.13); border-radius: 50%; transform: rotate(-16deg); }
.trajectory-orbit::before, .trajectory-orbit::after { content: ""; position: absolute; border-radius: 50%; }
.trajectory-orbit::before { width: 10px; height: 10px; background: var(--primary); box-shadow: 0 0 0 7px rgba(36,118,216,.09); }
.trajectory-orbit::after { width: 8px; height: 8px; background: var(--orange); box-shadow: 0 0 0 7px rgba(244,131,53,.08); }
.orbit-one { width: 460px; height: 180px; left: -170px; top: 25%; }
.orbit-one::before { right: 30px; top: 16px; }
.orbit-one::after { left: 80px; bottom: 12px; }
.orbit-two { width: 520px; height: 205px; right: -210px; top: 48%; transform: rotate(18deg); }
.orbit-two::before { left: 58px; top: 20px; }
.orbit-two::after { right: 88px; bottom: 10px; }
.hero-container { text-align: center; max-width: 1050px; }
.eyebrow, .section-kicker { color: var(--primary); text-transform: uppercase; letter-spacing: .13em; font-size: .76rem; font-weight: 750; }
.hero-title { margin-top: 14px; font-size: clamp(3rem, 8vw, 6.3rem); line-height: .98; letter-spacing: -.065em; }
.gradient-text { background: linear-gradient(100deg, var(--primary-dark) 0%, var(--primary) 32%, var(--accent) 63%, var(--orange) 100%); background-size: 220% 100%; -webkit-background-clip: text; background-clip: text; color: transparent; animation: gradientShift 8s ease-in-out infinite; }
@keyframes gradientShift { 0%,100% { background-position: 0 50%; } 50% { background-position: 100% 50%; } }
.hero-subtitle { margin: 28px auto 30px; max-width: 880px; color: var(--text); font-size: clamp(1.1rem, 2.3vw, 1.55rem); line-height: 1.52; font-weight: 420; }
.authors { max-width: 930px; margin: 0 auto 28px; }
.author-list { display: flex; flex-wrap: wrap; justify-content: center; gap: 5px 16px; }
.author { font-size: .94rem; color: var(--text); }
.author.strong { font-weight: 650; }
.author sup, .affiliations sup { font-size: .64em; color: var(--primary); }
.affiliations { display: flex; justify-content: center; flex-wrap: wrap; gap: 5px 24px; margin-top: 11px; color: var(--muted); font-size: .82rem; }
.author-note { margin-top: 5px; color: #8a94a7; font-size: .76rem; }
.hero-buttons { display: flex; justify-content: center; flex-wrap: wrap; gap: 11px; margin: 28px 0 36px; }
.btn { min-height: 46px; padding: 0 21px; border-radius: 999px; display: inline-flex; align-items: center; justify-content: center; gap: 9px; font-size: .9rem; font-weight: 650; border: 1px solid transparent; transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), color var(--transition); }
.btn:hover { transform: translateY(-2px); }
.btn-primary { color: #fff; background: linear-gradient(135deg, var(--primary), var(--primary-dark)); box-shadow: 0 10px 25px rgba(36,118,216,.24); }
.btn-primary:hover { box-shadow: 0 15px 32px rgba(36,118,216,.32); }
.btn-secondary { background: rgba(255,255,255,.86); border-color: var(--line); box-shadow: var(--shadow-sm); }
.btn-secondary:hover { border-color: rgba(36,118,216,.45); color: var(--primary-dark); }
.btn-disabled { color: #8a94a7; background: rgba(248,250,253,.9); border-color: var(--line); cursor: default; }
.btn-disabled:hover { transform: none; }
.btn-icon { font-size: .95rem; }
.hero-video-shell { max-width: 920px; margin: 0 auto 44px; padding: 17px; border-radius: var(--radius-lg); border: 1px solid rgba(255,255,255,.85); background: rgba(255,255,255,.72); box-shadow: var(--shadow); backdrop-filter: blur(18px); }
.video-shell-header { padding: 2px 4px 14px; display: flex; justify-content: space-between; align-items: center; gap: 18px; text-align: left; }
.video-shell-header > div { display: flex; align-items: center; gap: 12px; }
.video-shell-header p { color: var(--muted); font-size: .85rem; }
.video-badge { padding: 6px 11px; border-radius: 999px; color: #fff; background: linear-gradient(135deg, var(--primary), var(--accent)); text-transform: uppercase; letter-spacing: .07em; font-size: .69rem; font-weight: 700; white-space: nowrap; }
.asset-path { color: #8a94a7; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .72rem; }
.video-placeholder { min-height: 230px; border-radius: var(--radius); display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px; text-align: center; color: rgba(255,255,255,.9); background:
  radial-gradient(circle at 25% 20%, rgba(97,156,227,.35), transparent 30%),
  linear-gradient(145deg, #16243c, #253a5b 58%, #1d2f4e); position: relative; overflow: hidden; }
.video-placeholder::before { content: ""; position: absolute; inset: 0; opacity: .18; background-image: linear-gradient(rgba(255,255,255,.13) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.13) 1px, transparent 1px); background-size: 28px 28px; }
.video-placeholder > * { position: relative; z-index: 1; }
.hero-video-placeholder { aspect-ratio: 16/7.6; min-height: 290px; flex-direction: row; gap: 18px; }
.hero-video-placeholder > div:last-child { display: flex; flex-direction: column; align-items: flex-start; text-align: left; }
.video-placeholder strong { font-size: 1rem; }
.video-placeholder span { color: rgba(255,255,255,.62); font-size: .74rem; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.play-button { width: 58px; height: 58px; display: grid; place-items: center; border-radius: 50%; color: #fff; background: rgba(255,255,255,.15); border: 1px solid rgba(255,255,255,.22); box-shadow: 0 10px 30px rgba(0,0,0,.2); backdrop-filter: blur(8px); padding-left: 4px; }
.play-button.small { width: 46px; height: 46px; font-size: .8rem; }
.hero-stats { display: flex; justify-content: center; flex-wrap: wrap; gap: 28px 62px; }
.stat { min-width: 190px; }
.stat-value { display: block; font-size: 2rem; font-weight: 800; letter-spacing: -.04em; background: linear-gradient(100deg, var(--primary), var(--accent), var(--orange)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat-label { display: block; margin-top: 2px; color: var(--muted); font-size: .73rem; font-weight: 650; text-transform: uppercase; letter-spacing: .08em; }
.scroll-indicator { position: absolute; left: 50%; bottom: 27px; transform: translateX(-50%); display: flex; flex-direction: column; align-items: center; gap: 9px; color: #8a94a7; font-size: .65rem; text-transform: uppercase; letter-spacing: .12em; animation: float 2.2s ease-in-out infinite; }
.scroll-indicator i { width: 14px; height: 14px; border-right: 2px solid #99a3b4; border-bottom: 2px solid #99a3b4; transform: rotate(45deg); }
@keyframes float { 50% { transform: translate(-50%, 7px); } }

.section { padding: 104px 0; }
.section-header { text-align: center; margin-bottom: 58px; }
.section-title { margin-top: 8px; font-size: clamp(2.05rem, 4.5vw, 3.3rem); line-height: 1.12; letter-spacing: -.045em; }
.section-subtitle { max-width: 760px; margin: 14px auto 0; color: var(--muted); font-size: 1.02rem; }
.abstract-section, .tasks-section { background: var(--surface-soft); }
.abstract-card { padding: 28px; border-radius: var(--radius-lg); background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow-sm); }
.paper-figure { overflow: hidden; border-radius: var(--radius); background: #fff; border: 1px solid var(--line); }
.paper-figure img { width: 100%; }
.paper-figure figcaption { padding: 12px 16px; color: var(--muted); font-size: .78rem; text-align: center; background: #fbfcfe; border-top: 1px solid var(--line); }
.large-figure { margin-bottom: 28px; }
.abstract-copy { max-width: 980px; margin: 0 auto; }
.abstract-copy p { color: var(--text); font-size: 1.04rem; line-height: 1.84; margin-bottom: 17px; }
.abstract-copy p:last-child { margin-bottom: 0; }
.key-features { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 28px; }
.feature { padding: 28px 23px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow-sm); transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition); }
.feature:hover { transform: translateY(-5px); border-color: rgba(36,118,216,.34); box-shadow: var(--shadow); }
.feature-icon { width: 52px; height: 52px; margin-bottom: 19px; border-radius: 14px; position: relative; background: linear-gradient(135deg, rgba(36,118,216,.12), rgba(139,99,216,.10)); }
.feature-icon::before, .feature-icon::after { content: ""; position: absolute; }
.trajectory-icon::before { width: 31px; height: 16px; left: 10px; top: 19px; border-top: 2px solid var(--primary); border-radius: 50%; transform: rotate(-10deg); }
.trajectory-icon::after { width: 5px; height: 5px; right: 8px; top: 13px; border-radius: 50%; background: var(--orange); box-shadow: -10px 6px 0 var(--primary-light), -20px 10px 0 var(--primary); }
.mask-icon::before { inset: 12px; background: repeating-linear-gradient(90deg, var(--primary) 0 4px, transparent 4px 8px), repeating-linear-gradient(0deg, rgba(139,99,216,.55) 0 4px, transparent 4px 8px); border-radius: 5px; }
.world-icon::before { width: 26px; height: 26px; border: 2px solid var(--primary); border-radius: 50%; left: 12px; top: 12px; }
.world-icon::after { width: 11px; height: 11px; border-radius: 50%; background: var(--orange); left: 20px; top: 20px; box-shadow: 0 0 0 5px rgba(244,131,53,.13); }
.refine-icon::before { width: 28px; height: 2px; background: var(--primary); left: 11px; top: 25px; box-shadow: 0 -9px 0 var(--primary-light), 0 9px 0 var(--accent); }
.refine-icon::after { width: 7px; height: 7px; border-radius: 50%; background: var(--orange); right: 8px; top: 12px; box-shadow: -7px 9px 0 var(--primary), -17px 18px 0 var(--accent); }
.feature h3 { font-size: 1.02rem; line-height: 1.35; margin-bottom: 9px; }
.feature p { color: var(--muted); font-size: .86rem; line-height: 1.65; }

.method-section { background: #fff; }
.method-panel { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(330px, .75fr); gap: 32px; align-items: start; }
.method-steps { display: grid; gap: 14px; }
.step { display: flex; gap: 18px; padding: 21px; border-radius: 15px; background: var(--surface-soft); border-left: 3px solid var(--primary); transition: transform var(--transition), background var(--transition); }
.step:nth-child(3), .step:nth-child(4) { border-left-color: var(--orange); }
.step:hover { transform: translateX(4px); background: #fff; box-shadow: var(--shadow-sm); }
.step-number { min-width: 39px; color: var(--primary); font-size: 1.28rem; font-weight: 800; opacity: .72; }
.step:nth-child(3) .step-number, .step:nth-child(4) .step-number { color: var(--orange-dark); }
.step h3 { font-size: .98rem; margin-bottom: 5px; }
.step p { color: var(--muted); font-size: .84rem; line-height: 1.6; }
.refiner-panel { margin-top: 46px; padding: 32px; display: grid; grid-template-columns: .75fr 1.25fr; gap: 34px; align-items: center; border-radius: var(--radius-lg); border: 1px solid var(--line); background: linear-gradient(135deg, var(--surface-blue), #fff 54%, var(--surface-warm)); }
.refiner-copy h3 { margin: 7px 0 13px; font-size: clamp(1.45rem, 2.7vw, 2.05rem); line-height: 1.25; letter-spacing: -.035em; }
.refiner-copy p { color: var(--text); font-size: .94rem; }
.formula-card { margin-top: 22px; padding: 16px 18px; border-radius: 12px; background: rgba(255,255,255,.82); border: 1px solid rgba(36,118,216,.13); box-shadow: var(--shadow-sm); }
.formula-label { display: block; color: var(--muted); text-transform: uppercase; letter-spacing: .08em; font-size: .63rem; font-weight: 700; margin-bottom: 7px; }
.formula-card code { color: var(--primary-dark); font-size: .84rem; white-space: normal; }

.results-section { background: linear-gradient(180deg, #f8fbff 0%, #fff 100%); }
.result-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.result-card { padding: 30px; border-radius: var(--radius); background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow-sm); }
.result-card-heading { display: flex; justify-content: space-between; gap: 20px; align-items: flex-start; }
.result-domain { color: var(--primary); font-size: .7rem; font-weight: 750; text-transform: uppercase; letter-spacing: .09em; }
.result-card h3 { margin-top: 4px; font-size: 1.25rem; }
.result-highlight { font-size: 2.1rem; line-height: 1; font-weight: 800; color: var(--primary); letter-spacing: -.05em; }
.result-highlight.orange { color: var(--orange-dark); }
.bar-chart { display: grid; gap: 14px; margin: 28px 0 22px; }
.bar-row { display: grid; grid-template-columns: 112px 1fr 42px; gap: 12px; align-items: center; color: var(--muted); font-size: .77rem; }
.bar-row > div { height: 10px; border-radius: 999px; background: #edf1f7; overflow: hidden; }
.bar-row i { display: block; height: 100%; width: var(--value); border-radius: inherit; background: linear-gradient(90deg, #8ab9ef, var(--primary)); transform-origin: left; animation: growBar 1.3s cubic-bezier(.2,.7,.2,1) both; }
.orange-chart .bar-row i { background: linear-gradient(90deg, #ffc49d, var(--orange)); }
.bar-row.emphasized { color: var(--ink); font-weight: 650; }
.bar-row.emphasized i { box-shadow: 0 0 0 3px rgba(36,118,216,.08); }
.orange-chart .bar-row.emphasized i { box-shadow: 0 0 0 3px rgba(244,131,53,.10); }
.bar-row b { text-align: right; color: var(--ink); font-size: .8rem; }
@keyframes growBar { from { transform: scaleX(0); } to { transform: scaleX(1); } }
.result-note { color: var(--muted); font-size: .84rem; line-height: 1.65; }
.table-panel { margin-top: 26px; padding: 28px; border-radius: var(--radius); background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow-sm); }
.table-header { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; margin-bottom: 20px; }
.table-header h3 { margin-top: 5px; font-size: 1.35rem; }
.table-header > span { color: var(--muted); font-size: .76rem; }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 13px; }
table { width: 100%; border-collapse: collapse; min-width: 900px; font-size: .78rem; }
th, td { padding: 12px 13px; text-align: center; border-bottom: 1px solid var(--line); }
th:first-child, td:first-child { text-align: left; font-weight: 620; }
th { color: #536079; background: #f5f7fb; font-size: .69rem; text-transform: uppercase; letter-spacing: .04em; }
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: #fafcff; }
tr.ours { background: linear-gradient(90deg, rgba(36,118,216,.08), rgba(244,131,53,.06)); color: var(--ink); font-weight: 650; }
.efficiency-strip { margin-top: 26px; display: grid; grid-template-columns: repeat(4, 1fr); border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line); background: #fff; box-shadow: var(--shadow-sm); }
.efficiency-strip article { padding: 22px; text-align: center; border-right: 1px solid var(--line); }
.efficiency-strip article:last-child { border-right: 0; }
.efficiency-strip span, .efficiency-strip small { display: block; color: var(--muted); }
.efficiency-strip span { font-size: .72rem; text-transform: uppercase; letter-spacing: .06em; font-weight: 650; }
.efficiency-strip strong { display: block; margin: 7px 0 2px; font-size: 1.35rem; letter-spacing: -.03em; }
.efficiency-strip small { font-size: .72rem; }

.task-group + .task-group { margin-top: 42px; }
.task-group-title { display: flex; align-items: center; gap: 13px; margin-bottom: 18px; }
.task-group-title span { padding: 7px 13px; border-radius: 999px; color: #fff; background: linear-gradient(135deg, var(--primary), var(--accent)); font-size: .75rem; font-weight: 700; text-transform: uppercase; letter-spacing: .07em; }
.task-group-title.orange-title span { background: linear-gradient(135deg, var(--orange), var(--orange-dark)); }
.task-group-title small { color: var(--muted); }
.task-gallery { display: grid; grid-template-columns: repeat(3, 1fr); gap: 19px; }
.task-card { overflow: hidden; border-radius: var(--radius); border: 1px solid var(--line); background: #fff; box-shadow: var(--shadow-sm); transition: transform var(--transition), box-shadow var(--transition); }
.task-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.task-card img { width: 100%; aspect-ratio: 1000 / 333; object-fit: cover; }
.task-card figcaption { padding: 17px 18px; }
.task-card strong, .task-card span { display: block; }
.task-card strong { font-size: .94rem; }
.task-card span { margin-top: 4px; color: var(--muted); font-size: .78rem; }

.demos-section { background: #fff; }
.demo-row { padding: 28px; border-radius: var(--radius-lg); border: 1px solid var(--line); background: var(--surface-soft); }
.demo-row + .demo-row { margin-top: 24px; }
.demo-row-header { display: flex; gap: 19px; align-items: center; margin-bottom: 20px; }
.demo-index { width: 48px; height: 48px; flex: 0 0 48px; display: grid; place-items: center; border-radius: 14px; background: #fff; border: 1px solid var(--line); color: var(--primary); font-size: .9rem; font-weight: 800; box-shadow: var(--shadow-sm); }
.demo-row-header h3 { font-size: 1.15rem; }
.demo-row-header p { color: var(--muted); font-size: .84rem; }
.demo-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.video-card { overflow: hidden; border-radius: var(--radius); background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow-sm); }
.video-card .video-placeholder { min-height: 245px; border-radius: 0; }
.video-card .video-placeholder.warm { background: radial-gradient(circle at 75% 18%, rgba(255,187,141,.32), transparent 30%), linear-gradient(145deg, #3a241a, #5c3523 58%, #3b251b); }
.video-info { display: flex; justify-content: space-between; align-items: center; padding: 14px 17px; }
.video-info h4 { font-size: .88rem; }
.video-info p { color: var(--muted); font-size: .75rem; }

.citation-section { background: linear-gradient(180deg, #f8fbff, #f5f8fd); }
.citation-box { max-width: 1000px; margin: 0 auto; position: relative; padding: 26px; border-radius: var(--radius); background: #172033; box-shadow: var(--shadow); overflow: hidden; }
.citation-box::before { content: ""; position: absolute; width: 260px; height: 260px; right: -120px; top: -140px; border-radius: 50%; background: rgba(36,118,216,.16); }
.citation-box pre { overflow-x: auto; position: relative; z-index: 1; }
.citation-box code { color: #dbe7f7; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .79rem; line-height: 1.75; }
.copy-btn { position: absolute; right: 18px; top: 18px; z-index: 2; padding: 8px 12px; border-radius: 999px; border: 1px solid rgba(255,255,255,.18); color: #fff; background: rgba(255,255,255,.10); cursor: pointer; transition: background var(--transition), transform var(--transition); }
.copy-btn:hover { background: rgba(255,255,255,.18); transform: translateY(-1px); }

.footer { padding: 42px 0; background: #111827; color: #d3dbe8; }
.footer-content { text-align: center; display: grid; justify-items: center; gap: 8px; }
.footer-brand { color: #fff; font-size: 1rem; }
.footer p { color: #8f9aae; font-size: .78rem; }
.footer-meta { max-width: 760px; }

.reveal { opacity: 0; transform: translateY(18px); transition: opacity 700ms ease, transform 700ms ease; }
.reveal.visible { opacity: 1; transform: none; }

@media (max-width: 1020px) {
  .key-features { grid-template-columns: repeat(2, 1fr); }
  .method-panel, .refiner-panel { grid-template-columns: 1fr; }
  .method-panel .paper-figure { order: 0; }
  .result-grid { grid-template-columns: 1fr; }
  .efficiency-strip { grid-template-columns: repeat(2, 1fr); }
  .efficiency-strip article:nth-child(2) { border-right: 0; }
  .efficiency-strip article:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .task-gallery { grid-template-columns: 1fr; }
  .task-card img { aspect-ratio: 1000 / 333; }
}

@media (max-width: 820px) {
  .nav-links { position: absolute; top: 74px; left: 0; right: 0; display: none; flex-direction: column; align-items: stretch; gap: 0; padding: 12px 24px 20px; background: rgba(255,255,255,.97); border-bottom: 1px solid var(--line); box-shadow: var(--shadow-sm); }
  .nav-links.open { display: flex; }
  .nav-links a { display: block; padding: 11px 0; }
  .nav-links a::after { display: none; }
  .nav-toggle { display: flex; }
  .nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle.open span:nth-child(2) { opacity: 0; }
  .nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .hero { padding-top: 112px; }
  .desktop-break { display: none; }
  .hero-video-placeholder { min-height: 230px; }
  .video-shell-header { align-items: flex-start; }
  .video-shell-header > div { align-items: flex-start; flex-direction: column; gap: 7px; }
  .asset-path { display: none; }
  .demo-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .container, .nav-container { width: min(100% - 28px, var(--max-width)); }
  .section { padding: 78px 0; }
  .hero-title { font-size: clamp(2.2rem, 10.7vw, 4.5rem); letter-spacing: -.065em; }
  .hero-subtitle { font-size: 1.02rem; }
  .hero-video-shell { padding: 10px; }
  .hero-video-placeholder { min-height: 210px; flex-direction: column; }
  .hero-video-placeholder > div:last-child { align-items: center; text-align: center; }
  .hero-stats { gap: 22px; }
  .stat { min-width: 140px; }
  .key-features { grid-template-columns: 1fr; }
  .abstract-card, .refiner-panel, .result-card, .table-panel, .demo-row { padding: 20px; }
  .result-card-heading { align-items: center; }
  .result-highlight { font-size: 1.65rem; }
  .bar-row { grid-template-columns: 92px 1fr 36px; gap: 8px; }
  .efficiency-strip { grid-template-columns: 1fr; }
  .efficiency-strip article { border-right: 0; border-bottom: 1px solid var(--line); }
  .efficiency-strip article:last-child { border-bottom: 0; }
  .task-group-title { align-items: flex-start; flex-direction: column; }
  .demo-row-header { align-items: flex-start; }
  .video-card .video-placeholder { min-height: 205px; }
  .citation-box { padding: 70px 18px 22px; }
  .copy-btn { left: 18px; right: auto; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: 1ms !important; animation-iteration-count: 1 !important; transition-duration: 1ms !important; }
  .reveal { opacity: 1; transform: none; }
}

/* =========================================================
   V2 — interactive layout + strict alignment
   ========================================================= */

:where(a, button, [role="button"], [tabindex="0"]):focus-visible {
  outline: 3px solid rgba(36,118,216,.28);
  outline-offset: 3px;
}

.reading-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  overflow: hidden;
  pointer-events: none;
}
.reading-progress i {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent), var(--orange));
  transform: scaleX(0);
  transform-origin: left;
  will-change: transform;
}

/* Keep every repeated card system geometrically aligned. */
.key-features,
.result-grid,
.task-gallery,
.demo-grid { align-items: stretch; }
.key-features { grid-auto-rows: 1fr; }
.feature { height: 100%; display: flex; flex-direction: column; }
.feature p { margin-top: auto; }

.paper-figure.zoomable,
.task-card.zoomable {
  position: relative;
  cursor: zoom-in;
}
.zoom-hint {
  position: absolute;
  right: 14px;
  top: 14px;
  z-index: 2;
  padding: 7px 10px;
  border-radius: 999px;
  color: #fff;
  background: rgba(17,24,39,.72);
  backdrop-filter: blur(8px);
  font-size: .68rem;
  font-weight: 650;
  line-height: 1;
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity var(--transition), transform var(--transition);
}
.zoomable:hover .zoom-hint,
.zoomable:focus-visible .zoom-hint { opacity: 1; transform: none; }
.zoomable img { transition: transform 420ms cubic-bezier(.2,.7,.2,1); }
.zoomable:hover > img { transform: scale(1.012); }

/* Full-width method layout avoids a tall image next to a short text column. */
.method-panel {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  align-items: stretch;
}
.method-figure {
  width: 100%;
  min-height: 0;
}
.method-figure img {
  width: 100%;
  height: auto;
  object-fit: contain;
}
.method-steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  align-items: stretch;
}
.step {
  min-width: 0;
  height: 100%;
  display: grid;
  grid-template-columns: 40px minmax(0,1fr);
  align-content: start;
  gap: 12px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--primary);
  border-left: 1px solid var(--line);
  cursor: pointer;
  transform: none;
  background: var(--surface-soft);
}
.step:nth-child(3), .step:nth-child(4) {
  border-left-color: var(--line);
  border-top-color: var(--orange);
}
.step:hover { transform: translateY(-3px); }
.step.active {
  background: #fff;
  border-color: rgba(36,118,216,.3);
  border-top-color: var(--primary);
  box-shadow: 0 13px 34px rgba(31,60,105,.10);
}
.step:nth-child(3).active,
.step:nth-child(4).active { border-top-color: var(--orange); }
.method-focus {
  min-height: 62px;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  border-radius: 14px;
  border: 1px solid rgba(36,118,216,.15);
  background: linear-gradient(90deg, rgba(36,118,216,.07), rgba(139,99,216,.04), rgba(244,131,53,.05));
}
.method-focus-index {
  white-space: nowrap;
  padding: 6px 9px;
  border-radius: 999px;
  color: var(--primary-dark);
  background: #fff;
  border: 1px solid rgba(36,118,216,.14);
  font-size: .7rem;
  font-weight: 750;
  text-transform: uppercase;
  letter-spacing: .06em;
}
.method-focus strong { font-size: .88rem; line-height: 1.55; }

.refiner-panel {
  grid-template-columns: minmax(280px,.72fr) minmax(0,1.28fr);
  align-items: stretch;
}
.refiner-copy { align-self: center; }
.refiner-panel .paper-figure {
  align-self: center;
  width: 100%;
}
.selection-objective {
  width: 100%;
  box-sizing: border-box;

  padding: 28px 28px 30px;

  background: linear-gradient(
      135deg,
      rgba(255, 255, 255, 0.96),
      rgba(247, 250, 255, 0.96)
  );

  border: 1px solid #d8e5f7;
  border-radius: 20px;

  box-shadow:
      0 10px 30px rgba(36, 88, 160, 0.06);

  /* 不要 overflow: hidden */
}
.selection-objective-title {
  margin-bottom: 18px;

  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.12em;

  color: #71809b;
}
.selection-equation {
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;

  font-size: clamp(16px, 1.8vw, 23px);
  color: #1259b0;

  text-align: center;

  padding: 8px 4px 4px;

  overflow: visible;
}
.selection-equation mjx-container[jax="SVG"] > svg {
  max-width: 100% !important;
  height: auto !important;
}
.selection-equation::-webkit-scrollbar {
  display: none;
}
.selection-equation mjx-container[display="true"] {
  margin: 0 !important;
}
@media (max-width: 768px) {

  .selection-objective {
      padding: 22px 20px 24px;
  }

  .selection-objective-title {
      font-size: 12px;
      margin-bottom: 14px;
  }

  .selection-equation {
      font-size: 18px;
  }
}
.section-toolbar {
  min-height: 58px;
  margin: -24px auto 28px;
  padding: 9px 11px 9px 16px;
  display: flex;
  align-items: center;
  gap: 14px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255,255,255,.92);
  box-shadow: var(--shadow-sm);
}
.section-toolbar > span {
  color: var(--muted);
  font-size: .72rem;
  font-weight: 750;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.section-toolbar > small {
  margin-left: auto;
  color: var(--muted);
  font-size: .72rem;
}
.segmented-control {
  display: inline-flex;
  gap: 4px;
  padding: 4px;
  border-radius: 12px;
  background: #eef2f8;
}
.segmented-control button {
  border: 0;
  border-radius: 9px;
  padding: 8px 12px;
  color: var(--muted);
  background: transparent;
  font-size: .77rem;
  font-weight: 650;
  cursor: pointer;
  white-space: nowrap;
  transition: color var(--transition), background var(--transition), box-shadow var(--transition), transform var(--transition);
}
.segmented-control button:hover { color: var(--ink); }
.segmented-control button.active {
  color: var(--primary-dark);
  background: #fff;
  box-shadow: 0 4px 13px rgba(31,60,105,.10);
}

.result-grid { grid-auto-rows: 1fr; }
.result-card {
  height: 100%;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.result-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: rgba(36,118,216,.2); }
.result-card .bar-chart { flex: 0 0 auto; }
.result-note { margin-top: auto; }
.bar-row { position: relative; }
.bar-row > div { overflow: visible; }
.bar-row i { position: relative; transition: width 480ms cubic-bezier(.2,.7,.2,1); }
.bar-row i::after {
  content: attr(data-tooltip);
  position: absolute;
  right: 0;
  bottom: calc(100% + 7px);
  transform: translateX(50%) translateY(3px);
  padding: 5px 7px;
  border-radius: 7px;
  color: #fff;
  background: #172033;
  font-style: normal;
  font-size: .64rem;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition), transform var(--transition);
}
.bar-row:hover i::after { opacity: 1; transform: translateX(50%) translateY(0); }
.result-highlight { min-width: 96px; text-align: right; transition: transform 220ms ease, opacity 220ms ease; }
.result-highlight.updating { transform: translateY(-4px); opacity: .25; }

.efficiency-strip { align-items: stretch; }
.efficiency-strip article { display: grid; align-content: center; min-height: 112px; }

.task-group { transition: opacity 260ms ease, transform 260ms ease; }
.task-group[hidden] { display: none !important; }
.task-gallery { grid-auto-rows: 1fr; }
.task-card {
  height: 100%;
  display: grid;
  grid-template-rows: auto 1fr;
}
.task-card img {
  width: 100%;
  height: auto;
  aspect-ratio: auto;
  object-fit: contain;
  background: #f7f9fd;
}
.task-card figcaption { display: grid; align-content: start; }
.task-card figcaption span { line-height: 1.55; }

.demo-row { overflow: hidden; }
.demo-grid { grid-auto-rows: 1fr; }
.video-card {
  height: 100%;
  display: grid;
  grid-template-rows: 1fr auto;
  transition: transform var(--transition), box-shadow var(--transition);
}
.video-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.video-card .video-placeholder,
.hero-video-placeholder {
  aspect-ratio: 16 / 9;
  min-height: 0;
}
.interactive-placeholder {
  cursor: pointer;
  transition: filter var(--transition), transform var(--transition);
}
.interactive-placeholder:hover { filter: brightness(1.08); }
.interactive-placeholder:hover .play-button { transform: scale(1.08); }
.play-button { transition: transform var(--transition); }
.video-info { min-height: 58px; }

/* Modal/lightbox */
body.modal-open { overflow: hidden; }
.modal {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: grid;
  place-items: center;
  padding: 30px;
  background: rgba(9,15,27,.84);
  backdrop-filter: blur(14px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 220ms ease, visibility 220ms ease;
}
.modal.open { opacity: 1; visibility: visible; }
.modal-dialog {
  width: min(1180px, 96vw);
  max-height: 90vh;
  display: grid;
  justify-items: center;
  gap: 14px;
  padding: 16px;
  border-radius: 20px;
  background: rgba(20,27,42,.96);
  border: 1px solid rgba(255,255,255,.12);
  box-shadow: 0 28px 80px rgba(0,0,0,.3);
  transform: scale(.975) translateY(8px);
  transition: transform 240ms cubic-bezier(.2,.7,.2,1);
}
.modal.open .modal-dialog { transform: none; }
.modal-image {
  max-width: 100%;
  max-height: calc(90vh - 90px);
  object-fit: contain;
  border-radius: 12px;
  background: #fff;
}
.modal-caption { color: #cbd5e1; font-size: .78rem; text-align: center; }
.modal-close {
  position: absolute;
  top: 22px;
  right: 24px;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,.2);
  color: #fff;
  background: rgba(255,255,255,.08);
  font-size: 1.6rem;
  line-height: 1;
  cursor: pointer;
}
.modal-video-help {
  width: min(680px, 88vw);
  padding: 42px 30px;
  text-align: center;
  color: #fff;
}
.modal-video-help h3 { margin: 7px 0 16px; font-size: 1.35rem; }
.modal-video-help code {
  display: inline-block;
  max-width: 100%;
  padding: 10px 13px;
  overflow-wrap: anywhere;
  border-radius: 10px;
  color: #dbeafe;
  background: rgba(36,118,216,.18);
  border: 1px solid rgba(106,169,240,.22);
}
.modal-video-help p { max-width: 600px; margin: 18px auto 0; color: #9eabc0; font-size: .85rem; }
.modal-kicker { color: #90c1fb; font-size: .69rem; font-weight: 750; text-transform: uppercase; letter-spacing: .1em; }
.toast {
  position: fixed;
  z-index: 2200;
  left: 50%;
  bottom: 24px;
  transform: translate(-50%, 12px);
  padding: 9px 13px;
  border-radius: 999px;
  color: #fff;
  background: #172033;
  box-shadow: var(--shadow);
  font-size: .76rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms ease, transform 200ms ease;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

@media (max-width: 1020px) {
  .method-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .refiner-panel { grid-template-columns: 1fr; }
  .task-gallery { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .section-toolbar { margin-top: -18px; }
}

@media (max-width: 820px) {
  .section-toolbar { align-items: flex-start; flex-wrap: wrap; }
  .section-toolbar > small { width: 100%; margin-left: 0; }
  .result-grid { grid-template-columns: 1fr; }
  .demo-grid { grid-template-columns: 1fr; }
  .hero-video-placeholder { flex-direction: column; }
  .hero-video-placeholder > div:last-child { align-items: center; text-align: center; }
}

@media (max-width: 640px) {
  .method-steps,
  .task-gallery { grid-template-columns: 1fr; }
  .method-focus { grid-template-columns: 1fr; }
  .section-toolbar { padding: 12px; }
  .segmented-control { width: 100%; overflow-x: auto; }
  .segmented-control button { flex: 1 0 auto; }
  .result-card-heading { align-items: flex-start; }
  .result-highlight { min-width: auto; }
  .bar-row { grid-template-columns: 105px minmax(0,1fr) 42px; }
  .modal { padding: 14px; }
  .modal-close { top: 12px; right: 12px; }
  .modal-dialog { width: 100%; padding: 10px; }
  .video-info { gap: 12px; }
}
.task-group.first-visible { margin-top: 0 !important; }

/* ===== Final video integration ===== */
.paper-video-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: #0d1626;
  isolation: isolate;
}
.hero-paper-video {
  border-radius: var(--radius);
}
.video-card .paper-video-frame {
  border-radius: 0;
}
.paper-video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  background: #0d1626;
}