/* InstantViR project page styles */

:root {
  --bg: #0b0c10;
  --bg-alt: #11141e;
  --bg-card: #151827;
  --accent: #ff6b6b;
  --accent-soft: rgba(255, 107, 107, 0.18);
  --accent-2: #4dabf7;
  --text-main: #f5f7ff;
  --text-muted: #b4b8d4;
  --border-subtle: rgba(255, 255, 255, 0.06);
  --shadow-soft: 0 18px 45px rgba(0, 0, 0, 0.45);
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-pill: 999px;
  --max-width: 1120px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #20253a 0, #040510 50%, #000 100%);
  color: var(--text-main);
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

main {
  padding: 32px 16px 64px;
}

.page {
  max-width: var(--max-width);
  margin: 0 auto;
}

/* ---------- Hero ---------- */

.hero {
  padding: 32px 16px 0;
  background: radial-gradient(circle at top, #1e2238 0, #050712 55%);
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: 24px;
  align-items: center;
}

.hero-main {
  max-width: 720px;
  text-align: center;
  margin: 0 auto;
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
  justify-content: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  white-space: nowrap;
}

.badge span.dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #17c964;
  box-shadow: 0 0 0 6px rgba(23, 201, 100, 0.15);
}

.title {
  font-size: clamp(32px, 3vw, 40px);
  line-height: 1.15;
  margin: 0 0 10px;
}

.subtitle {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.authors {
  margin-top: 14px;
  font-size: 14px;
  color: var(--text-muted);
  text-align: center;
}

.authors strong {
  color: #e0e4ff;
}

.affiliations {
  margin-top: 6px;
  font-size: 14px;
  color: var(--text-muted);
  text-align: center;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
  justify-content: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 18px;
  font-size: 15px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  cursor: pointer;
  background: transparent;
  color: var(--text-main);
  transition: all 0.18s ease-out;
}

.btn-primary {
  background: linear-gradient(120deg, #ff6b6b, #f9a826);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.55);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.7);
}

.btn-ghost {
  border-color: rgba(255, 255, 255, 0.14);
  background: rgba(16, 20, 40, 0.8);
}

.btn-ghost:hover {
  border-color: rgba(255, 255, 255, 0.32);
  background: rgba(24, 28, 56, 0.95);
}

.btn span.icon {
  font-size: 16px;
}

.hero-teaser {
  position: relative;
  border-radius: 22px;
  padding: 14px;
  background: radial-gradient(circle at top left, #ff6b6b1f, transparent 55%),
    radial-gradient(circle at bottom right, #4dabf71a, transparent 55%),
    #060714;
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.hero-teaser-wide {
  max-width: var(--max-width);
  margin: 26px auto 4px;
}

.hero-teaser img {
  width: 100%;
  height: auto;
  border-radius: 16px;
  display: block;
}

.hero-teaser .tag {
  position: absolute;
  inset: auto 16px 14px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--text-muted);
}

.hero-teaser .tag span {
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background: rgba(0, 0, 0, 0.6);
}

.hero-teaser .tag span.accent {
  background: var(--accent-soft);
  color: #ffdede;
}

/* ---------- Top navigation ---------- */

.top-nav {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(18px);
  background: rgba(4, 5, 16, 0.94);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.top-nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.top-nav-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 600;
}

.top-nav-logo {
  width: 26px;
  height: 26px;
  border-radius: 9px;
  background: linear-gradient(135deg, #ff6b6b, #f9a826, #4dabf7);
  display: grid;
  place-items: center;
  font-size: 18px;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.7);
}

.top-nav-name {
  background: linear-gradient(120deg, #ff6b6b, #f9a826, #4dabf7);
  -webkit-background-clip: text;
  color: transparent;
}

.top-nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.top-nav-links a {
  font-size: 15px;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--text-muted);
  transition: all 0.15s ease-out;
}

.top-nav-links a:hover {
  color: var(--text-main);
  border-color: rgba(255, 255, 255, 0.32);
  background: rgba(30, 36, 70, 0.95);
}

.top-nav-links a.active {
  color: var(--text-main);
  border-color: rgba(255, 255, 255, 0.32);
  background: rgba(30, 36, 70, 0.95);
}

/* Brand wordmark in hero */

.brand-banner {
  margin-bottom: 6px;
}

.brand-wordmark {
  display: inline-block;
  font-size: clamp(34px, 3.6vw, 44px);
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  background: linear-gradient(120deg, #ff6b6b, #f9a826, #4dabf7);
  -webkit-background-clip: text;
  color: transparent;
}

/* ---------- Sections ---------- */

.section {
  margin-top: 40px;
}

.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}

.section-title {
  font-size: 24px;
  font-weight: 700;
  margin: 0;
}

#abstract .section-title,
#method .section-title,
#videos .section-title,
#metrics .section-title {
  font-size: 26px;
}

.section-kicker {
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--accent-2);
  font-weight: 600;
}

/* 让关键块的 ABSTRACT / METHOD / QUALITATIVE RESULTS / SPEED & QUALITY 更醒目 */
#abstract .section-kicker,
#method .section-kicker,
#videos .section-kicker,
#metrics .section-kicker {
  font-size: 16px;
  letter-spacing: 0.2em;
}

#abstract .section-header,
#method .section-header,
#videos .section-header,
#metrics .section-header {
  justify-content: center;
  text-align: center;
}

.section-subtitle {
  font-size: 15px;
  color: var(--text-muted);
  max-width: 620px;
}

.card {
  background: linear-gradient(135deg, #141827, #090b15);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  padding: 18px 18px 16px;
  box-shadow: var(--shadow-soft);
}

.card p {
  margin: 0;
  font-size: 16px;
  color: var(--text-muted);
}

/* Abstract: center the block to make the text stand out */
#abstract .section-header {
  justify-content: center;
  text-align: center;
}

#abstract .abstract-text {
  max-width: 860px;
  margin: 0 auto;
}

#abstract .pill-row {
  justify-content: center;
}

.abstract-text p + p {
  margin-top: 10px;
}

.highlight {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  background: linear-gradient(120deg, #20e3b2, #4dabf7);
  color: #050712;
  font-weight: 600;
  box-shadow: 0 0 0 1px rgba(5, 7, 18, 0.4),
    0 12px 30px rgba(0, 0, 0, 0.65);
}

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.pill {
  font-size: 13px;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--text-muted);
}

/* ---------- Method ---------- */

.method-layout {
  display: flex;
  flex-direction: column;
  gap: 24px;
  align-items: center;
}

.method-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  width: 100%;
  max-width: 1000px;
}

.method-item {
  background: #111425;
  border-radius: var(--radius-md);
  padding: 16px;
  border: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.method-item-title {
  font-size: 17px;
  margin: 0 0 8px;
  color: #e0e4ff;
  font-weight: 600;
}

.method-item-desc {
  margin: 0;
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.5;
}

@media (max-width: 768px) {
  .method-list {
    grid-template-columns: 1fr;
  }
}

.overview-fig {
  border-radius: var(--radius-lg);
  background: #050612;
  padding: 10px;
  border: 1px solid var(--border-subtle);
  overflow: hidden;
}

.overview-fig img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  display: block;
}

.overview-caption {
  margin-top: 6px;
  font-size: 13px;
  color: var(--text-muted);
}

/* ---------- Video demos ---------- */

.task-tabs {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.task-card {
  background: #101324;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  padding: 14px 14px 12px;
}

.task-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.task-title {
  margin: 0;
  font-size: 17px;
}

.task-badge {
  font-size: 12px;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-muted);
}

.task-desc {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.sample-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.sample-grid.wide {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.sample-grid figure {
  margin: 0;
  font-size: 13px;
  color: var(--text-muted);
}

.sample-grid video,
.sample-grid img {
  width: 100%;
  border-radius: 10px;
  display: block;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: #000;
}

.sample-grid figcaption {
  margin-top: 4px;
}

.media-rows {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.media-row {
  display: grid;
  gap: 8px;
}

.media-row.main {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.media-row.secondary {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.media-row.full {
  grid-template-columns: minmax(0, 1fr);
}

.media-row figure {
  margin: 0;
  font-size: 13px;
  color: var(--text-muted);
}

.media-row video,
.media-row img {
  width: 100%;
  border-radius: 10px;
  display: block;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: #000;
}

.media-row figcaption {
  margin-top: 4px;
}

/* ---------- Split compare (Measurement vs Ours) ---------- */

.cmp {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: #000;
  border: 1px solid rgba(255, 255, 255, 0.08);
  aspect-ratio: 16 / 9;
}

.cmp video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.cmp-layer {
  position: absolute;
  inset: 0;
}

.cmp-top {
  --split: 50%;
  clip-path: polygon(0 0, var(--split) 0, var(--split) 100%, 0 100%);
}

.cmp-handle {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  height: 100%;
  width: 2px;
  background: #fff;
  z-index: 4;
}

.cmp-knob {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: linear-gradient(180deg, #ffffff, #d0d7ff);
  border: 2px solid #111;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.6);
  z-index: 5;
  cursor: pointer;
}

.cmp-knob span {
  font-size: 18px;
  color: #111;
}

.cmp-labels {
  position: absolute;
  left: 10px;
  right: 10px;
  top: 10px;
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  z-index: 6;
}

.cmp-label {
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(16, 18, 28, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.16);
}

/* ---------- Quantitative tables ---------- */

.results-tables {
  margin-top: 20px;
  display: grid;
  gap: 16px;
}

.results-table-wrapper {
  background: #050712;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  padding: 12px 14px;
  box-shadow: var(--shadow-soft);
  overflow-x: auto;
}

.results-table-title {
  font-size: 15px;
  font-weight: 600;
  margin: 0 0 6px;
}

.results-table-caption {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 8px;
}

table.results-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  min-width: 540px;
}

.results-table th,
.results-table td {
  padding: 4px 8px;
  text-align: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.results-table th {
  font-weight: 600;
  color: #dde1ff;
  background: rgba(255, 255, 255, 0.04);
  border-bottom: 2px solid rgba(255, 255, 255, 0.1);
}

.results-table tr:nth-child(even) td {
  background: rgba(255, 255, 255, 0.015);
}

.results-table tr:hover td {
  background: rgba(255, 255, 255, 0.04);
}

.results-table tr:last-child td {
  border-bottom: none;
}

.results-table td:first-child,
.results-table th:first-child {
  text-align: left;
}

.underline {
  text-decoration: underline;
}

.metrics-row {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  gap: 18px;
}

.metric-highlight {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 8px;
}

.metric-highlight span {
  font-size: 14px;
  color: var(--text-muted);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.03);
}

.metric-fig {
  border-radius: var(--radius-lg);
  background: #050612;
  padding: 10px;
  border: 1px solid var(--border-subtle);
}

.metric-fig img {
  width: 100%;
  border-radius: var(--radius-md);
  display: block;
}

/* ---------- Bib / Footer ---------- */

.bib-card {
  font-family: "JetBrains Mono", Menlo, Consolas, "SF Mono", monospace;
  font-size: 14px;
  background: #050712;
  padding: 14px 16px;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.15);
  overflow-x: auto;
}

footer {
  padding: 20px 16px 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  margin-top: 40px;
  font-size: 14px;
  color: var(--text-muted);
}

footer .footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: space-between;
  align-items: center;
}

/* ---------- Responsive ---------- */

@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero {
    padding-bottom: 18px;
  }

  .top-nav-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .method-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .metrics-row {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 640px) {
  main {
    padding-inline: 14px;
  }

  .hero-inner {
    gap: 22px;
  }

  .cta-row {
    flex-direction: column;
    align-items: center;
  }

  .task-tabs {
    grid-template-columns: minmax(0, 1fr);
  }
}