:root {
  --bg-base: #f3f7fb;
  --bg-alt: #e9f2ff;
  --ink: #17202f;
  --ink-soft: #4b5563;
  --card: #ffffff;
  --line: #d8e2f2;
  --brand: #1266d6;
  --brand-2: #0f3b78;
  --good: #128a56;
  --warn: #b7791f;
}

* {
  box-sizing: border-box;
}

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

body {
  font-family: "Aptos", "Segoe UI", "Trebuchet MS", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 10% -10%, #d7e8ff 0%, transparent 40%),
    radial-gradient(circle at 95% 8%, #e6f8ff 0%, transparent 36%),
    linear-gradient(160deg, var(--bg-base) 0%, var(--bg-alt) 100%);
  line-height: 1.55;
}

a {
  color: var(--brand);
}

.wrap {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 18px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: rgba(245, 250, 255, 0.92);
  backdrop-filter: blur(8px);
}

.topbar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  padding: 12px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  width: 150px;
  object-fit: contain;
  flex-shrink: 0;
}

.brand h1 {
  margin: 0;
  font-size: 20px;
  letter-spacing: 0.2px;
  color: #10233e;
}

.lang-switch {
  display: flex;
  gap: 10px;
}

.lang-switch a {
  text-decoration: none;
  font-weight: 700;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 12px;
  color: var(--ink);
  background: #fff;
}

.lang-switch a.active {
  border-color: var(--brand);
  color: var(--brand);
  box-shadow: inset 0 0 0 1px rgba(18, 102, 214, 0.08);
}

.hero {
  padding: 26px 0 16px;
}

.hero-card {
  background: linear-gradient(120deg, #ffffff 0%, #eef5ff 100%);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 24px;
  box-shadow: 0 10px 26px rgba(14, 48, 91, 0.08);
}

.hero h2 {
  margin: 0 0 8px;
  font-size: 32px;
}

.hero p {
  margin: 0;
  color: var(--ink-soft);
  max-width: 920px;
}

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

.chip {
  display: inline-flex;
  border: 1px solid #cbddfb;
  border-radius: 999px;
  padding: 5px 10px;
  font-size: 13px;
  background: #f6f9ff;
}

.grid {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 20px;
  padding: 12px 0 50px;
}

.toc {
  position: sticky;
  top: 76px;
  align-self: start;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--card);
  padding: 14px;
  max-height: calc(100vh - 94px);
  overflow: auto;
  box-shadow: 0 8px 24px rgba(13, 37, 74, 0.08);
}

.toc h3 {
  margin: 0 0 8px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--ink-soft);
}

.toc a {
  text-decoration: none;
  color: #1a2536;
  display: block;
  border-radius: 8px;
  padding: 7px 9px;
  font-size: 14px;
}

.toc a:hover {
  background: #f0f6ff;
}

.panel {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--card);
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: 0 10px 24px rgba(14, 41, 76, 0.06);
}

.panel h3 {
  margin: 0 0 8px;
  font-size: 24px;
}

.panel h4 {
  margin: 18px 0 8px;
  font-size: 18px;
  color: var(--brand-2);
}

.panel h5 {
  margin: 14px 0 6px;
  font-size: 16px;
  color: #30415d;
}

.panel p,
.panel li {
  color: #1d2737;
}

.panel ul,
.panel ol {
  margin-top: 8px;
  margin-bottom: 0;
  padding-left: 22px;
}

.path {
  display: inline-block;
  border: 1px dashed #bbcff2;
  border-radius: 10px;
  background: #f3f8ff;
  font-size: 13px;
  padding: 4px 9px;
  margin: 3px 0;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 10px;
  font-size: 14px;
}

th,
td {
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  padding: 8px 9px;
}

th {
  background: #eff5ff;
  color: #2b3f5e;
}

.note,
.warn,
.good {
  border-radius: 12px;
  padding: 12px;
  margin-top: 10px;
  border: 1px solid;
}

.note {
  border-color: #b9d9ff;
  background: #eaf4ff;
}

.warn {
  border-color: #f0d7a2;
  background: #fff8e7;
}

.good {
  border-color: #b8e3cf;
  background: #ecf9f2;
}

.shot-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 8px;
}

.shot {
  border: 1px solid #d7e3f8;
  border-radius: 12px;
  background: #fbfdff;
  padding: 10px;
}

.shot strong {
  display: block;
  margin-bottom: 6px;
}

.shot img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  border: 1px solid #dce7fb;
  display: block;
  margin-bottom: 8px;
  cursor: zoom-in;
}

.shot small {
  display: block;
  color: #5a6577;
}

kbd {
  border: 1px solid #c9d6f0;
  border-bottom-width: 2px;
  border-radius: 6px;
  padding: 0 6px;
  background: #fff;
  font-size: 12px;
}

.footer {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  text-align: left;
  font-size: 13px;
  color: var(--ink-soft);
  padding: 22px 0 36px;
}

.footer img {
  width: 34px;
  height: 34px;
  object-fit: contain;
}

.footer a {
  font-weight: 700;
}

.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(3, 8, 18, 0.9);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 60;
  padding: 22px;
}

.lightbox.open {
  display: flex;
}

.lightbox-img {
  max-width: min(1200px, 96vw);
  max-height: 88vh;
  width: auto;
  height: auto;
  border-radius: 10px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.lightbox-close {
  position: absolute;
  top: 14px;
  right: 16px;
  border: 1px solid rgba(255, 255, 255, 0.4);
  background: rgba(255, 255, 255, 0.12);
  color: #ffffff;
  border-radius: 999px;
  width: 38px;
  height: 38px;
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
}

.lightbox-hint {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  color: #dce8ff;
  font-size: 12px;
}

body.lightbox-open {
  overflow: hidden;
}

@media (max-width: 1040px) {
  .grid {
    grid-template-columns: 1fr;
  }

  .toc {
    position: static;
    max-height: none;
  }
}

@media (max-width: 760px) {
  .hero h2 {
    font-size: 26px;
  }

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

  .footer {
    flex-direction: column;
    text-align: center;
  }

  .topbar-inner {
    align-items: flex-start;
  }

  .brand h1 {
    font-size: 18px;
  }
}