:root {
  color-scheme: light;
  --bg: #f7f5ef;
  --panel: #ffffff;
  --text: #202124;
  --muted: #667085;
  --line: #dedbd2;
  --accent: #0f766e;
  --accent-strong: #115e59;
  --chip: #eef8f6;
  --warn: #9a3412;
  --shadow: 0 14px 35px rgba(31, 41, 55, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  line-height: 1.5;
}

.site-header {
  background: #12312e;
  color: #f8fafc;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.header-inner {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 42px 0 34px;
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 28px;
}

.eyebrow {
  margin: 0 0 8px;
  color: #99f6e4;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

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

h1 {
  margin: 0;
  font-size: clamp(34px, 5vw, 64px);
  line-height: 1;
  letter-spacing: 0;
}

.subtitle {
  margin: 14px 0 0;
  max-width: 720px;
  color: #d8e6e2;
  font-size: 17px;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(82px, 1fr));
  gap: 10px;
  min-width: 320px;
}

.stats div {
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.06);
  border-radius: 8px;
  padding: 12px 14px;
}

.stats strong {
  display: block;
  font-size: 24px;
  line-height: 1.1;
}

.stats span {
  color: #cbd5e1;
  font-size: 12px;
}

main {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.controls {
  margin-top: 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: 16px;
}

.search-box,
.filters label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.search-box input,
.filters select {
  width: 100%;
  height: 42px;
  border: 1px solid #cfcac0;
  border-radius: 8px;
  background: #fff;
  color: var(--text);
  font: inherit;
  font-weight: 500;
  padding: 0 12px;
}

.search-box input:focus,
.filters select:focus {
  border-color: var(--accent);
  outline: 3px solid rgba(15, 118, 110, 0.16);
}

.filters {
  margin-top: 14px;
  display: grid;
  grid-template-columns: minmax(220px, 1.5fr) repeat(3, minmax(150px, 1fr));
  gap: 12px;
}

.result-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 18px 2px 12px;
  color: var(--muted);
}

.result-bar strong {
  color: var(--text);
}

button {
  height: 36px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--accent-strong);
  cursor: pointer;
  font: inherit;
  font-weight: 700;
  padding: 0 13px;
}

button:hover {
  border-color: var(--accent);
}

.paper-list {
  display: grid;
  gap: 12px;
  padding-bottom: 42px;
}

.paper-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
}

.paper-top {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 16px;
}

.paper-title {
  margin: 0;
  font-size: 20px;
  line-height: 1.25;
  letter-spacing: 0;
}

.paper-title a {
  color: var(--text);
  text-decoration: none;
}

.paper-title a:hover {
  color: var(--accent-strong);
  text-decoration: underline;
}

.paper-id {
  margin-top: 6px;
  color: var(--muted);
  font-size: 13px;
}

.badges {
  display: flex;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 8px;
  min-width: 220px;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  border-radius: 999px;
  background: var(--chip);
  color: var(--accent-strong);
  font-size: 12px;
  font-weight: 800;
  padding: 4px 10px;
  white-space: nowrap;
}

.badge.grade {
  background: #fff7ed;
  color: var(--warn);
}

.badge.video {
  background: #ecfdf3;
  color: #047857;
}

.badge.no-video {
  background: #f2f4f7;
  color: #667085;
}

.summary {
  margin: 12px 0 0;
  color: #3f4651;
}

.paper-body {
  margin-top: 12px;
}

.paper-body.with-cover {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  align-items: start;
  gap: 14px;
}

.video-cover-block {
  display: grid;
  gap: 8px;
}

.cover-button,
.cover-frame {
  position: relative;
  display: block;
  width: 180px;
  height: auto;
  aspect-ratio: 16 / 9;
  border: 0;
  border-radius: 8px;
  background: #111827;
  cursor: pointer;
  padding: 0;
  overflow: hidden;
}

.cover-frame {
  cursor: default;
}

.cover {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #111827;
}

.play-mark {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: #fff;
  background: rgba(0, 0, 0, 0.22);
  font-weight: 900;
}

.play-mark {
  font-size: 30px;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.55);
}

.platform-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.platform {
  min-height: 28px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  border-radius: 999px;
  color: #fff;
  text-decoration: none;
  font-size: 12px;
  font-weight: 900;
  padding: 4px 9px;
}

.platform svg {
  width: 16px;
  height: 16px;
  flex: 0 0 16px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2;
}

.platform.youtube svg {
  fill: currentColor;
  stroke: currentColor;
}

.platform.bilibili {
  background: #00a1d6;
}

.platform.youtube {
  background: #ff0033;
}

.platform.douyin {
  background: #111827;
}

.platform.external {
  background: var(--accent-strong);
}

.platform.muted {
  background: #eef2f7;
  color: var(--muted);
}

.paper-body .summary {
  margin-top: 0;
}

.video-info {
  margin-top: 12px;
  border-left: 3px solid var(--accent);
  padding-left: 10px;
}

.video-title {
  color: var(--accent-strong);
  font-size: 14px;
  font-weight: 800;
}

.video-info p {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.meta {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  color: var(--muted);
  font-size: 13px;
}

.links {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.links a {
  min-height: 34px;
  display: inline-flex;
  align-items: center;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  color: var(--accent-strong);
  background: #fff;
  text-decoration: none;
  font-size: 13px;
  font-weight: 800;
  padding: 6px 10px;
}

.links a:hover {
  border-color: var(--accent);
}

.empty-state,
footer {
  color: var(--muted);
  text-align: center;
}

footer {
  border-top: 1px solid var(--line);
  padding: 24px 16px 34px;
}

.compact-header .header-inner {
  align-items: start;
  padding: 30px 0 28px;
}

.compact-header h1 {
  max-width: 980px;
  font-size: clamp(28px, 4vw, 48px);
  line-height: 1.08;
}

.detail-main {
  padding: 24px 0 42px;
}

.detail-card {
  max-width: 920px;
  margin: 0 auto;
}

.detail-badges {
  justify-content: flex-start;
  min-width: 0;
}

.detail-meta {
  margin: 18px 0 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
}

.detail-meta div {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px;
}

.detail-meta dt {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.detail-meta dd {
  margin: 4px 0 0;
  color: var(--text);
  font-size: 14px;
  font-weight: 700;
  overflow-wrap: anywhere;
}

.detail-meta a {
  color: var(--accent-strong);
}

.detail-section {
  margin-top: 22px;
}

.detail-section h2 {
  margin: 0 0 10px;
  font-size: 18px;
  line-height: 1.25;
}

.detail-section p {
  margin: 0 0 12px;
  color: #3f4651;
}

.detail-cover-link {
  display: block;
  width: min(100%, 560px);
  aspect-ratio: 16 / 9;
  background: #111827;
  border-radius: 8px;
  overflow: hidden;
}

.detail-cover {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.detail-video-embed {
  width: min(100%, 760px);
  aspect-ratio: 16 / 9;
  background: #111827;
  border-radius: 8px;
  overflow: hidden;
}

.detail-video-embed iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}

.modal[hidden] {
  display: none;
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: 20px;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.72);
}

.modal-panel {
  position: relative;
  width: min(960px, 100%);
  background: #0b1117;
  border-radius: 8px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
  overflow: hidden;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  color: #fff;
}

.modal-header h2 {
  margin: 0;
  font-size: 16px;
  line-height: 1.3;
}

.icon-button {
  width: 34px;
  height: 34px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  font-size: 22px;
  line-height: 1;
  padding: 0;
}

.player-body {
  aspect-ratio: 16 / 9;
  background: #000;
}

.player-body iframe {
  width: 100%;
  height: 100%;
  border: 0;
}

.modal-open {
  overflow: hidden;
}

@media (max-width: 820px) {
  .header-inner,
  .paper-top {
    display: block;
  }

  .stats {
    margin-top: 22px;
    min-width: 0;
  }

  .filters {
    grid-template-columns: 1fr;
  }

  .badges {
    justify-content: flex-start;
    min-width: 0;
    margin-top: 12px;
  }

  .paper-body.with-cover {
    grid-template-columns: 1fr;
  }

  .cover {
    width: min(100%, 360px);
  }

  .cover-button,
  .cover-frame {
    width: min(100%, 360px);
  }
}

@media (max-width: 520px) {
  .header-inner,
  main {
    width: min(100% - 20px, 1180px);
  }

  .stats {
    grid-template-columns: 1fr;
  }

  .result-bar {
    align-items: stretch;
    flex-direction: column;
  }

  button {
    width: 100%;
  }
}