:root {
  --bg: #0d1117;
  --panel: #131a24;
  --panel-soft: #182232;
  --text: #f5f7fb;
  --muted: #9aa7b6;
  --line: rgba(255, 255, 255, 0.12);
  --gold: #d9ad55;
  --green: #50c878;
  --blue: #62a8ff;
  --red: #ff6b6b;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--text);
  background: #0d1117;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", "Noto Sans", Arial, sans-serif;
  line-height: 1.65;
}

a {
  color: inherit;
}

.backtest-page {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 42px 0 56px;
}

.language-switcher {
  position: fixed;
  top: 18px;
  right: 18px;
  z-index: 80;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(13, 17, 23, 0.92);
  backdrop-filter: blur(12px);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.28);
}

.language-switcher label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

.language-switcher select {
  border: 0;
  outline: 0;
  color: var(--text);
  background: transparent;
  font: 700 13px Inter, system-ui, sans-serif;
  cursor: pointer;
}

.language-switcher option {
  color: #12161f;
  background: #fff;
}

.top-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 34px;
}

.top-links a,
.hero-actions a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text);
  text-decoration: none;
  background: rgba(255, 255, 255, 0.04);
}

.top-links a:hover,
.hero-actions a:hover {
  border-color: rgba(217, 173, 85, 0.55);
  background: rgba(217, 173, 85, 0.12);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(280px, 0.92fr);
  gap: 28px;
  align-items: end;
  padding: 34px 0 28px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 5px 10px;
  border: 1px solid rgba(217, 173, 85, 0.35);
  border-radius: 8px;
  color: var(--gold);
  background: rgba(217, 173, 85, 0.1);
  font-size: 13px;
  font-weight: 800;
}

h1 {
  margin: 16px 0 14px;
  font-size: clamp(34px, 6vw, 64px);
  line-height: 1.05;
}

.hero p,
.section-head p,
.shot-copy,
.risk-note,
.card p {
  margin: 0;
  color: var(--muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.metric-card,
.read-card,
.shot-card,
.featured-card,
.risk-band {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: 0 18px 42px rgba(0, 0, 0, 0.18);
}

.metric-card {
  min-height: 104px;
  padding: 18px;
}

.metric-card b {
  display: block;
  color: var(--text);
  font-size: clamp(22px, 4vw, 34px);
  line-height: 1.1;
}

.metric-card span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 13px;
}

.section-head {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: end;
  margin: 44px 0 16px;
}

.section-head h2 {
  margin: 0;
  font-size: clamp(24px, 4vw, 36px);
  line-height: 1.18;
}

.featured-card {
  overflow: hidden;
  background: var(--panel-soft);
}

.featured-card img,
.shot-card img {
  display: block;
  width: 100%;
  height: auto;
}

.featured-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  align-items: center;
  padding: 18px;
  border-top: 1px solid var(--line);
}

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

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 4px 9px;
  border-radius: 8px;
  color: #11161e;
  background: var(--gold);
  font-size: 12px;
  font-weight: 800;
}

.tag.blue {
  background: var(--blue);
}

.tag.green {
  background: var(--green);
}

.open-image {
  border: 1px solid rgba(217, 173, 85, 0.55);
  border-radius: 8px;
  color: var(--text);
  background: rgba(217, 173, 85, 0.12);
  font: 800 14px Inter, system-ui, sans-serif;
  padding: 11px 14px;
  cursor: pointer;
}

.open-image:hover {
  background: rgba(217, 173, 85, 0.22);
}

.gallery-grid,
.read-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.shot-card {
  overflow: hidden;
}

.image-button {
  display: block;
  width: 100%;
  padding: 0;
  border: 0;
  background: #0b0f15;
  cursor: pointer;
}

.image-button img {
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.shot-card figcaption {
  padding: 16px;
}

.shot-card h3,
.read-card h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.read-card {
  padding: 18px;
}

.read-card strong {
  display: block;
  margin-bottom: 8px;
  color: var(--gold);
}

.risk-band {
  margin-top: 34px;
  padding: 18px;
  border-color: rgba(255, 107, 107, 0.34);
  background: rgba(255, 107, 107, 0.08);
}

.risk-band b {
  color: #ffd1d1;
}

.site-footer {
  margin-top: 36px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

.image-modal {
  position: fixed;
  inset: 0;
  z-index: 120;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 26px;
  background: rgba(0, 0, 0, 0.86);
}

.image-modal.is-open {
  display: flex;
}

.modal-frame {
  position: relative;
  width: min(1400px, 96vw);
  max-height: 92vh;
}

.modal-frame img {
  display: block;
  max-width: 100%;
  max-height: 92vh;
  margin: 0 auto;
  border-radius: 8px;
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.55);
}

.modal-close {
  position: absolute;
  top: -16px;
  right: -16px;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--text);
  background: #141a23;
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
}

@media (max-width: 920px) {
  .hero,
  .featured-body {
    grid-template-columns: 1fr;
  }

  .gallery-grid,
  .read-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 620px) {
  .backtest-page {
    width: min(100% - 22px, 1180px);
    padding-top: 72px;
  }

  .language-switcher {
    top: 12px;
    right: 11px;
  }

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

  .section-head {
    display: block;
  }

  .top-links {
    margin-right: 118px;
  }
}