:root {
  --bg-950: #050711;
  --bg-900: #0b1026;
  --panel-900: #0e1632;
  --panel-850: #121d40;
  --text-50: #f4f7ff;
  --text-200: #d9e1ff;
  --text-400: #b0bade;
  --line-500: rgba(136, 164, 255, 0.32);
  --line-300: rgba(136, 164, 255, 0.2);
  --primary-400: #89b3ff;
  --secondary-400: #a997ff;
  --success-400: #54dea5;
  --warning-400: #ffcf84;
  --radius-xl: 22px;
  --radius-lg: 16px;
  --radius-md: 12px;
  --shadow-lg: 0 24px 50px rgba(1, 4, 20, 0.45);
  --shadow-md: 0 14px 34px rgba(1, 4, 20, 0.32);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  margin: 0;
  overflow-x: clip;
  color: var(--text-50);
  font-family: Inter, Roboto, Arial, sans-serif;
  line-height: 1.72;
  text-rendering: optimizeLegibility;
  background:
    radial-gradient(1000px 540px at -4% -10%, rgba(118, 170, 255, 0.15), transparent 45%),
    radial-gradient(820px 500px at 102% -8%, rgba(168, 137, 255, 0.15), transparent 50%),
    radial-gradient(760px 480px at 50% 108%, rgba(86, 132, 242, 0.11), transparent 56%),
    linear-gradient(165deg, var(--bg-950), var(--bg-900));
  background-attachment: fixed;
}

@media (max-width: 1024px) {
  body { background-attachment: scroll; }
}

a { color: var(--primary-400); text-decoration: none; -webkit-tap-highlight-color: rgba(137, 179, 255, 0.25); }
a:hover { text-decoration: underline; }

.layout {
  width: min(1480px, 100%);
  margin: 0 auto;
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  grid-template-columns: minmax(min(276px, 100%), 320px) minmax(0, 1fr);
  gap: clamp(14px, 2vw, 24px);
  padding-top: max(clamp(10px, 2vw, 18px), env(safe-area-inset-top, 0px));
  padding-right: max(clamp(10px, 2vw, 18px), env(safe-area-inset-right, 0px));
  padding-bottom: max(clamp(10px, 2vw, 18px), env(safe-area-inset-bottom, 0px));
  padding-left: max(clamp(10px, 2vw, 18px), env(safe-area-inset-left, 0px));
}

.sidebar {
  position: sticky;
  top: 14px;
  max-height: calc(100vh - 28px);
  overflow: auto;
  padding: 20px 18px;
  border-radius: 20px;
  border: 1px solid var(--line-300);
  background: linear-gradient(180deg, rgba(20, 31, 69, 0.86), rgba(12, 19, 44, 0.94));
  box-shadow: var(--shadow-lg);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.logo {
  inline-size: 52px;
  block-size: 52px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  font-weight: 800;
  letter-spacing: 0.5px;
  color: #061027;
  background: linear-gradient(135deg, #9dc5ff 0%, #9483ff 100%);
  box-shadow: 0 8px 24px rgba(114, 145, 255, 0.35);
}

.brand-name {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 800;
}

.brand-meta {
  margin: 2px 0 0;
  color: var(--text-400);
  font-size: 0.85rem;
}

.sidebar-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 14px;
}

.btn-sidebar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 8px 14px;
  border-radius: 10px;
  border: 1px solid var(--line-500);
  color: var(--text-200);
  font-size: 0.88rem;
  font-weight: 600;
  text-decoration: none;
  background: rgba(12, 19, 43, 0.5);
}

.btn-sidebar:hover {
  border-color: rgba(137, 179, 255, 0.55);
  color: #fff;
  text-decoration: none;
}

.toc-mobile {
  display: none;
  margin-bottom: 12px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line-500);
  background: rgba(12, 19, 43, 0.76);
  padding: 6px 12px 10px;
}

.toc-title {
  margin: 8px 0 10px;
  font-size: 0.98rem;
  letter-spacing: 0.2px;
}

.sidebar ol { margin: 0; padding-left: 18px; }
.sidebar li { margin: 6px 0; color: var(--text-400); }
.sidebar a { color: var(--text-200); }

.content {
  inline-size: min(100%, 1020px);
  max-width: 100%;
  min-width: 0;
  padding-bottom: 42px;
}

/* Changelog and other pages without `.layout` sidebar */
.doc-standalone {
  width: min(100%, 980px);
  margin: 0 auto;
  padding-top: max(18px, env(safe-area-inset-top, 0px));
  padding-right: max(clamp(12px, 4vw, 24px), env(safe-area-inset-right, 0px));
  padding-bottom: 32px;
  padding-left: max(clamp(12px, 4vw, 24px), env(safe-area-inset-left, 0px));
}

.hero {
  border: 1px solid var(--line-300);
  border-radius: var(--radius-xl);
  padding: clamp(16px, 2.4vw, 32px);
  background: linear-gradient(160deg, rgba(22, 34, 78, 0.9), rgba(13, 22, 48, 0.95));
  box-shadow: var(--shadow-lg);
  margin-bottom: 14px;
}

.badge {
  display: inline-block;
  margin: 0;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
  color: #e0d9ff;
  border: 1px solid rgba(169, 151, 255, 0.4);
  background: rgba(169, 151, 255, 0.16);
}

h1 {
  margin: 10px 0 8px;
  font-size: clamp(1.9rem, 3vw, 2.6rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h2 {
  margin: 0 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line-300);
  font-size: clamp(1.2rem, 2.1vw, 1.44rem);
}

h3 {
  margin: 0 0 10px;
  font-size: 1.02rem;
}

p, li { color: var(--text-200); overflow-wrap: break-word; }
ul, ol { margin-top: 8px; }

.section-panel {
  margin-top: 14px;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(136, 164, 255, 0.16);
  background: linear-gradient(170deg, rgba(15, 24, 54, 0.92), rgba(10, 16, 35, 0.96));
  box-shadow: var(--shadow-md);
  padding: clamp(14px, 1.8vw, 18px) clamp(12px, 1.8vw, 18px) 10px;
}

.card {
  margin: 12px 0;
  border-radius: var(--radius-md);
  border: 1px solid rgba(136, 164, 255, 0.2);
  background: linear-gradient(160deg, rgba(19, 30, 65, 0.95), rgba(14, 21, 45, 0.96));
  padding: 14px;
}

.grid.two {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.diagram-flow {
  margin-top: 12px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.diagram-flow .node {
  padding: 8px 11px;
  border-radius: 999px;
  border: 1px solid var(--line-500);
  background: rgba(20, 36, 82, 0.74);
  color: #e8eeff;
  font-size: 0.9rem;
}

.diagram-flow .arrow {
  font-weight: 700;
  color: #b9c8ff;
}

pre {
  margin: 8px 0;
  border-radius: var(--radius-md);
  border: 1px solid #2e428d;
  background: #081027;
  padding: clamp(10px, 2.5vw, 14px);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior-x: contain;
  font-size: clamp(0.72rem, 2.6vw, 0.875rem);
  line-height: 1.55;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

pre code { color: #c9f4ff; }

p code,
li code {
  border-radius: 5px;
  border: 1px solid #3755ae;
  background: #17275a;
  color: #dce8ff;
  padding: 1px 6px;
}

.notice {
  margin: 12px 0;
  border-radius: 10px;
  border: 1px solid var(--line-500);
  background: rgba(19, 31, 66, 0.84);
  padding: 12px 14px;
}

.notice.warning {
  border-color: rgba(255, 207, 132, 0.56);
  background: rgba(81, 58, 29, 0.58);
}

.notice.success {
  border-color: rgba(84, 222, 165, 0.5);
  background: rgba(21, 67, 53, 0.57);
}

.steps > li {
  margin-bottom: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(136, 164, 255, 0.2);
  background: rgba(10, 16, 36, 0.57);
}

.screenshot { margin: 12px 0 18px; }

.screenshot img {
  display: block;
  width: 100%;
  max-width: 1180px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(136, 164, 255, 0.35);
  box-shadow: 0 16px 38px rgba(0, 0, 0, 0.42);
}

.screenshot figcaption {
  margin-top: 7px;
  font-size: 0.9rem;
  color: var(--text-400);
}

.service-grid {
  margin-top: 12px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.service-card {
  border-radius: var(--radius-md);
  border: 1px solid rgba(136, 164, 255, 0.24);
  background: rgba(11, 18, 40, 0.78);
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.service-card strong { color: #eef3ff; }
.service-card span { color: var(--text-400); font-size: 0.88rem; }

.pill-grid {
  margin-top: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.pill {
  border-radius: 999px;
  border: 1px solid var(--line-500);
  background: rgba(18, 31, 70, 0.76);
  color: #e4ebff;
  padding: 6px 10px;
  font-size: 0.84rem;
}

.timeline {
  margin: 10px 0 8px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.timeline li {
  display: grid;
  grid-template-columns: 30px 1fr;
  gap: 10px;
  align-items: start;
}

.timeline .step-dot {
  inline-size: 28px;
  block-size: 28px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  font-size: 0.82rem;
  font-weight: 700;
  color: #07102a;
  background: linear-gradient(140deg, #8eb6ff, #a997ff);
}

.timeline .step-body {
  border: 1px solid rgba(136, 164, 255, 0.2);
  border-radius: 10px;
  background: rgba(12, 20, 44, 0.7);
  padding: 8px 10px;
}

@media (max-width: 1120px) {
  .layout {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .sidebar {
    position: static;
    max-height: none;
    padding: 16px;
  }

  /* Collapsible TOC only; hide duplicate desktop list */
  .toc-mobile { display: block; }
  .sidebar nav > ol {
    display: none;
  }
  .toc-mobile summary {
    cursor: pointer;
    font-weight: 700;
    color: #dce8ff;
    list-style: none;
    min-height: 44px;
    display: flex;
    align-items: center;
    padding: 6px 0;
    user-select: none;
  }
  .toc-mobile summary::-webkit-details-marker { display: none; }
  .toc-mobile ol { margin: 8px 0 2px; padding-left: 18px; }
  .toc-mobile a {
    display: block;
    padding: 10px 4px;
    margin: 2px 0;
  }
  .toc-title { display: none; }

  .grid.two { grid-template-columns: 1fr; }
  .service-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 768px) {
  .layout {
    padding-top: max(8px, env(safe-area-inset-top, 0px));
    padding-right: max(8px, env(safe-area-inset-right, 0px));
    padding-bottom: max(8px, env(safe-area-inset-bottom, 0px));
    padding-left: max(8px, env(safe-area-inset-left, 0px));
  }
  .content { padding-bottom: max(24px, env(safe-area-inset-bottom, 0px)); }
  h1 { font-size: clamp(1.35rem, 6vw, 1.56rem); }
  h2 { font-size: clamp(1rem, 4.2vw, 1.06rem); }

  .sidebar ol { columns: 1; }
  .service-grid { grid-template-columns: 1fr; }

  .diagram-flow { gap: 6px; }
  .diagram-flow .node {
    width: 100%;
    border-radius: 10px;
  }
  .diagram-flow .arrow {
    width: 100%;
    text-align: center;
  }

  .btn-sidebar {
    min-height: 44px;
    flex: 1 1 auto;
    min-width: min(100%, 8rem);
  }

  .sidebar-actions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(7.5rem, 1fr));
    gap: 10px;
  }
}

@media (max-width: 480px) {
  .layout {
    gap: 10px;
    padding-left: max(10px, env(safe-area-inset-left, 0px));
    padding-right: max(10px, env(safe-area-inset-right, 0px));
  }

  .sidebar {
    padding: 14px 12px;
    border-radius: 16px;
  }

  .logo {
    inline-size: 46px;
    block-size: 46px;
    font-size: 0.9rem;
  }

  .brand-name { font-size: 1rem; }

  .hero {
    padding: 14px;
    border-radius: var(--radius-lg);
  }

  .section-panel {
    padding: 12px 12px 10px;
    border-radius: var(--radius-md);
  }

  .card { padding: 12px; }

  .doc-standalone {
    padding-left: max(10px, env(safe-area-inset-left, 0px));
    padding-right: max(10px, env(safe-area-inset-right, 0px));
  }
}

@media (max-height: 520px) and (orientation: landscape) {
  .sidebar {
    padding: 12px;
  }

  .sidebar .brand {
    margin-bottom: 10px;
  }

  .logo {
    inline-size: 44px;
    block-size: 44px;
  }
}