/* ===========================================================
   Ridge — GitHub Pages site
   Theme: 田埂 / field ridges. Dark earth + ridge-green accent.
   =========================================================== */

:root {
  --bg-0: #0c1310;
  --bg-1: #121a16;
  --bg-2: #19241e;
  --bg-3: #223028;

  --line: #2a3a31;
  --line-soft: #1f2c25;

  --crop: #ece0c4;            /* primary text — dry-grass cream */
  --crop-soft: #c9bf9f;
  --mist: #8a9a8d;            /* muted text */
  --mist-soft: #5b6b62;

  --ridge: #7fb069;           /* primary accent — ridge green */
  --ridge-bright: #9ed184;
  --ridge-deep: #547549;
  --soil: #d97757;            /* CTA accent — warm sunset */
  --soil-bright: #ea8a6a;
  --sun: #e6c454;             /* highlight — wheat gold */

  --shadow: 0 12px 36px -12px rgba(0, 0, 0, 0.6);
  --glow-ridge: 0 0 0 1px rgba(127, 176, 105, 0.18), 0 8px 28px -8px rgba(127, 176, 105, 0.25);

  --rad: 12px;
  --rad-sm: 8px;
  --rad-lg: 18px;

  --font-display: 'Space Grotesk', 'Inter', system-ui, -apple-system, 'PingFang SC', 'Noto Sans CJK SC', sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, 'PingFang SC', 'Noto Sans CJK SC', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, Consolas, 'Cascadia Code', monospace;
}

/* ---------- reset & base ---------- */
* { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: var(--font-body);
  background: var(--bg-0);
  color: var(--crop);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  background-image:
    radial-gradient(1200px 600px at 80% -200px, rgba(127, 176, 105, 0.08), transparent 60%),
    radial-gradient(900px 500px at -10% 30%, rgba(217, 119, 87, 0.06), transparent 60%);
}

a { color: var(--ridge-bright); text-decoration: none; transition: color 0.15s ease; }
a:hover { color: var(--soil-bright); }

img, svg { max-width: 100%; display: block; }

::selection { background: rgba(127, 176, 105, 0.35); color: var(--crop); }

/* ---------- field-ridge backdrop ---------- */
.ridge-grid-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.35;
  background-image:
    linear-gradient(to right, var(--line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-soft) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 30%, black 30%, transparent 80%);
}

/* ---------- layout ---------- */
.page {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 28px;
}

@media (max-width: 720px) {
  .page { padding: 0 18px; }
}

section { padding: 96px 0; }
@media (max-width: 720px) { section { padding: 64px 0; } }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ridge);
  margin-bottom: 14px;
}
.eyebrow::before {
  content: '';
  width: 24px;
  height: 1px;
  background: var(--ridge);
}

h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 700; line-height: 1.15; letter-spacing: -0.02em; color: var(--crop); }
h1 { font-size: clamp(40px, 6vw, 72px); }
h2 { font-size: clamp(28px, 4vw, 44px); }
h3 { font-size: 20px; }

p { color: var(--crop-soft); }

/* ---------- nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: rgba(12, 19, 16, 0.7);
  border-bottom: 1px solid var(--line-soft);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 14px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--crop);
  letter-spacing: -0.01em;
}

.brand-mark {
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  font-size: 14px;
}
.nav-links a { color: var(--mist); }
.nav-links a:hover { color: var(--crop); }
.nav-links a.active { color: var(--ridge); }

@media (max-width: 720px) {
  .nav-links { gap: 14px; font-size: 13px; }
  .nav-links .nav-hide-sm { display: none; }
}

/* ---------- hero ---------- */
.hero {
  padding-top: 80px;
  padding-bottom: 60px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 56px;
  align-items: center;
}
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
}

.hero-title {
  margin: 8px 0 22px;
}
.hero-title .accent { color: var(--ridge); }
.hero-title .soil { color: var(--soil); }

.hero-sub {
  font-size: 18px;
  color: var(--mist);
  max-width: 540px;
  margin-bottom: 32px;
}

.cta-row {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 22px;
  border-radius: var(--rad-sm);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 15px;
  border: 1px solid var(--line);
  background: var(--bg-2);
  color: var(--crop);
  cursor: pointer;
  transition: transform 0.12s ease, background 0.12s ease, border-color 0.12s ease;
}
.btn:hover { transform: translateY(-1px); background: var(--bg-3); border-color: var(--ridge-deep); color: var(--crop); }

.btn-primary {
  background: linear-gradient(135deg, var(--soil) 0%, #b85a3f 100%);
  border-color: rgba(217, 119, 87, 0.6);
  color: #1a0e08;
}
.btn-primary:hover { background: linear-gradient(135deg, var(--soil-bright) 0%, var(--soil) 100%); color: #1a0e08; }

.btn .arrow { transition: transform 0.15s ease; }
.btn:hover .arrow { transform: translateX(2px); }

.meta-row {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mist-soft);
}
.meta-row span { display: inline-flex; align-items: center; gap: 6px; }
.meta-row .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--ridge); }

/* ---------- hero visual: field plots ---------- */
.field-frame {
  position: relative;
  background: var(--bg-1);
  border: 1px solid var(--line);
  border-radius: var(--rad-lg);
  padding: 14px;
  box-shadow: var(--shadow);
  overflow: hidden;
}
.field-frame::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, rgba(127,176,105,0.25), transparent 40%, rgba(217,119,87,0.18) 90%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.field-titlebar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 10px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--mist-soft);
}
.field-titlebar .lights { display: flex; gap: 6px; }
.field-titlebar .lights span {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--bg-3);
  border: 1px solid var(--line);
}

.field-plots {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 10px;
  aspect-ratio: 16 / 11;
  border-radius: var(--rad);
  overflow: hidden;
  background: var(--bg-0);
}

.plot {
  background: var(--bg-2);
  border-radius: var(--rad-sm);
  padding: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--crop-soft);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.plot::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(127,176,105,0.05) 1px, transparent 1px);
  background-size: 14px 100%;
  pointer-events: none;
}
.plot .label {
  font-size: 10px;
  color: var(--ridge);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.plot .row { color: var(--mist); }
.plot .row.cmd { color: var(--crop); }
.plot .row.ok { color: var(--ridge-bright); }
.plot .row.warn { color: var(--sun); }

/* ---------- features ---------- */
.section-head { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.section-head p { font-size: 17px; color: var(--mist); margin-top: 14px; }

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
@media (max-width: 960px) { .feature-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .feature-grid { grid-template-columns: 1fr; } }

.feature {
  position: relative;
  padding: 28px;
  background: var(--bg-1);
  border: 1px solid var(--line-soft);
  border-radius: var(--rad);
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
  overflow: hidden;
}
.feature:hover {
  transform: translateY(-3px);
  border-color: var(--ridge-deep);
  background: var(--bg-2);
}
.feature::after {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: linear-gradient(to bottom, var(--ridge), transparent);
  opacity: 0;
  transition: opacity 0.2s ease;
}
.feature:hover::after { opacity: 1; }

.feature-icon {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: rgba(127, 176, 105, 0.08);
  border: 1px solid var(--ridge-deep);
  color: var(--ridge);
  margin-bottom: 18px;
}

.feature h3 { margin-bottom: 10px; color: var(--crop); }
.feature p { font-size: 14.5px; line-height: 1.65; color: var(--mist); }

/* ---------- showcase media ---------- */
.media-frame {
  background: var(--bg-1);
  border: 1px solid var(--line);
  border-radius: var(--rad-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.media-frame .media-bar {
  display: flex; align-items: center; gap: 8px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mist-soft);
}
.media-frame .media-bar .lights { display: flex; gap: 6px; }
.media-frame .media-bar .lights span {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--bg-3); border: 1px solid var(--line);
}
.media-frame .media-bar .path { margin-left: 8px; }

.media-body {
  position: relative;
  background: var(--bg-0);
  aspect-ratio: 16 / 9;
  display: grid;
  place-items: center;
}
.media-body img,
.media-body video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.placeholder-tag {
  position: absolute;
  bottom: 14px; right: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--mist);
  background: rgba(12,19,16,0.85);
  padding: 6px 10px;
  border-radius: 6px;
  border: 1px dashed var(--line);
}

/* ---------- showcase rows ---------- */
.showcase-row {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 56px;
  align-items: center;
  margin-bottom: 64px;
}
.showcase-row.flip { grid-template-columns: 1.2fr 1fr; }
.showcase-row.flip .showcase-text { order: 2; }
.showcase-row.flip .showcase-media { order: 1; }
@media (max-width: 960px) {
  .showcase-row,
  .showcase-row.flip { grid-template-columns: 1fr; }
  .showcase-row.flip .showcase-text { order: 1; }
}

.showcase-text h2 { margin-bottom: 18px; }
.showcase-text p { font-size: 16px; color: var(--mist); margin-bottom: 16px; }
.showcase-text ul { list-style: none; }
.showcase-text li {
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--crop-soft);
  padding: 8px 0 8px 22px;
  position: relative;
}
.showcase-text li::before {
  content: '╱╱';
  position: absolute;
  left: 0;
  top: 8px;
  color: var(--ridge);
  letter-spacing: -2px;
}

/* ---------- quick start ---------- */
.code-block {
  background: var(--bg-1);
  border: 1px solid var(--line);
  border-radius: var(--rad);
  padding: 20px 22px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--crop);
  white-space: pre;
  overflow-x: auto;
  line-height: 1.65;
  box-shadow: var(--shadow);
}
.code-block .cmt { color: var(--mist-soft); }
.code-block .kw { color: var(--ridge); }
.code-block .str { color: var(--sun); }
.code-block .prompt { color: var(--soil); }

.tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--line-soft);
}
.tab {
  padding: 10px 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mist);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.tab.active { color: var(--ridge); border-bottom-color: var(--ridge); }
.tab:hover { color: var(--crop); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ---------- releases ---------- */
.release-list {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.release {
  background: var(--bg-1);
  border: 1px solid var(--line-soft);
  border-radius: var(--rad);
  padding: 28px 32px;
  transition: border-color 0.15s ease;
}
.release:hover { border-color: var(--ridge-deep); }

.release-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 18px;
}
.release-tag {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  color: var(--ridge);
  letter-spacing: -0.02em;
}
.release-tag .v { color: var(--mist-soft); margin-right: 2px; }
.release-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mist-soft);
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.release-meta .pill {
  padding: 3px 9px;
  border-radius: 999px;
  background: rgba(127, 176, 105, 0.1);
  color: var(--ridge);
  border: 1px solid var(--ridge-deep);
}
.release-meta .pill.first {
  background: rgba(217, 119, 87, 0.12);
  color: var(--soil-bright);
  border-color: rgba(217, 119, 87, 0.4);
}

.release h3 { font-size: 18px; margin-bottom: 6px; }
.release h4 {
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ridge);
  margin: 22px 0 10px;
}
.release ul { list-style: none; }
.release li {
  position: relative;
  padding: 4px 0 4px 18px;
  color: var(--crop-soft);
  font-size: 14px;
}
.release li::before {
  content: '╱';
  position: absolute;
  left: 0; top: 4px;
  color: var(--ridge);
}

/* ---------- docs page ---------- */
.docs-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 56px;
  padding: 56px 0;
}
@media (max-width: 900px) {
  .docs-layout { grid-template-columns: 1fr; }
  .docs-side { position: static; }
}

.docs-side {
  position: sticky;
  top: 80px;
  align-self: start;
  font-size: 14px;
  border-left: 1px solid var(--line-soft);
  padding-left: 18px;
}
.docs-side h4 {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mist-soft);
  margin: 18px 0 8px;
  font-weight: 500;
}
.docs-side h4:first-child { margin-top: 0; }
.docs-side ul { list-style: none; }
.docs-side li a {
  display: block;
  padding: 5px 0;
  color: var(--mist);
  font-size: 13.5px;
}
.docs-side li a:hover { color: var(--crop); }
.docs-side li a.active { color: var(--ridge); }

.docs-content { max-width: 760px; }
.docs-content h1 { margin-bottom: 16px; }
.docs-content h2 {
  margin: 56px 0 16px;
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
}
.docs-content h3 { margin: 28px 0 10px; font-size: 18px; }
.docs-content p { margin-bottom: 14px; font-size: 16px; line-height: 1.75; }
.docs-content ul { margin: 0 0 16px 22px; }
.docs-content li { color: var(--crop-soft); padding: 4px 0; }
.docs-content code:not(pre code) {
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--bg-2);
  border: 1px solid var(--line-soft);
  padding: 1px 7px;
  border-radius: 5px;
  color: var(--ridge-bright);
}
.docs-content pre {
  margin: 14px 0 22px;
}
.docs-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 14px 0;
  font-size: 14px;
}
.docs-content th, .docs-content td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line-soft);
}
.docs-content th {
  color: var(--ridge);
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 500;
}

.callout {
  display: flex;
  gap: 14px;
  padding: 16px 18px;
  background: rgba(127, 176, 105, 0.06);
  border-left: 3px solid var(--ridge);
  border-radius: 6px;
  margin: 18px 0;
}
.callout p { margin: 0; font-size: 14.5px; color: var(--crop-soft); }
.callout .cb-icon { color: var(--ridge); flex-shrink: 0; margin-top: 2px; }
.callout.warn { background: rgba(217, 119, 87, 0.08); border-left-color: var(--soil); }
.callout.warn .cb-icon { color: var(--soil); }

/* ---------- footer ---------- */
.foot {
  border-top: 1px solid var(--line-soft);
  margin-top: 80px;
  padding: 40px 0 32px;
  font-size: 13px;
  color: var(--mist-soft);
}
.foot-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 18px;
}
.foot-inner .links { display: flex; gap: 22px; }
.foot-inner .links a { color: var(--mist); }

/* ---------- ridge divider ---------- */
.ridge-divider {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 12px 0;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--mist-soft);
  letter-spacing: 0.15em;
  text-transform: uppercase;
}
.ridge-divider::before,
.ridge-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--line), transparent);
}

/* ---------- tiny utils ---------- */
.center { text-align: center; }
.muted { color: var(--mist); }
.mono { font-family: var(--font-mono); }
.gap-sm { gap: 8px; }

/* ---------- entrance animations (light, respectful) ---------- */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.55s ease, transform 0.55s ease;
  }
  .reveal.in { opacity: 1; transform: none; }

  @keyframes ridge-pulse {
    0%, 100% { opacity: 0.4; }
    50%      { opacity: 1; }
  }
  .pulse { animation: ridge-pulse 2.4s ease-in-out infinite; }
}