/* GardenerNick website — shared styles
   Warm, botanical, gouache-inspired. Light, friendly, readable. */

:root {
  --bg: #fbf9f4;
  --bg-soft: #f3efe5;
  --card: #ffffff;
  --border: #ece7dc;
  --ink: #2c2a26;
  --ink-soft: #6b6760;
  --ink-faint: #9a958b;
  --accent: #3e7c4f;
  --accent-strong: #336641;
  --accent-tint: #e7f0e8;
  --radius: 18px;
  --radius-sm: 12px;
  --shadow: 0 1px 2px rgba(44, 42, 38, .04), 0 8px 24px rgba(44, 42, 38, .06);
  --maxw: 880px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto,
          "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}

/* Language visibility — toggled by data-lang on <html> */
.lang-en, .lang-zh { display: none; }
html[data-lang="en"] .lang-en { display: revert; }
html[data-lang="zh"] .lang-zh { display: revert; }

a { color: var(--accent-strong); text-decoration: none; }
a:hover { text-decoration: underline; }

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

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px clamp(16px, 4vw, 32px);
  background: rgba(251, 249, 244, .82);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: var(--ink);
}
.brand:hover { text-decoration: none; }
.brand img {
  width: 32px; height: 32px;
  border-radius: 9px;
  object-fit: cover;
  box-shadow: var(--shadow);
}

.site-header nav {
  margin-left: auto;
  display: flex;
  gap: clamp(10px, 2.5vw, 22px);
  align-items: center;
  font-size: 15px;
}
.site-header nav a { color: var(--ink-soft); }
.site-header nav a:hover { color: var(--accent-strong); text-decoration: none; }

.lang-toggle {
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent-strong);
  background: var(--accent-tint);
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 6px 14px;
  cursor: pointer;
  white-space: nowrap;
  transition: background .15s ease;
}
.lang-toggle:hover { background: #dcebdd; }

/* ---------- Layout ---------- */
main { padding: 0 clamp(16px, 4vw, 32px); }

.wrap { max-width: var(--maxw); margin: 0 auto; }
.prose { max-width: 760px; margin: 0 auto; padding: 40px 0 24px; }

.prose h1 { font-size: clamp(28px, 5vw, 38px); line-height: 1.2; margin: 0 0 6px; letter-spacing: -.02em; }
.prose h2 { font-size: 22px; margin: 36px 0 10px; letter-spacing: -.01em; }
.prose h3 { font-size: 18px; margin: 24px 0 6px; }
.prose p, .prose li { color: var(--ink); }
.prose ul { padding-left: 22px; }
.prose li { margin: 6px 0; }
.prose .updated { color: var(--ink-faint); font-size: 15px; margin-top: 0; }
.prose strong { font-weight: 650; }
.prose a { text-decoration: underline; text-underline-offset: 2px; }

.callout {
  background: var(--accent-tint);
  border: 1px solid #d3e4d4;
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  margin: 18px 0;
  font-size: 15.5px;
  color: var(--accent-strong);
}

/* ---------- Hero (landing) ---------- */
.hero {
  text-align: center;
  padding: clamp(48px, 8vw, 88px) 0 40px;
}
.hero .nick {
  width: clamp(140px, 32vw, 200px);
  height: auto;
  margin: 0 auto 28px;
  border-radius: 28px;
  box-shadow: var(--shadow);
}
.hero h1 {
  font-size: clamp(32px, 6vw, 52px);
  line-height: 1.08;
  letter-spacing: -.03em;
  margin: 0 0 14px;
}
.hero .tagline {
  font-size: clamp(17px, 2.5vw, 21px);
  color: var(--ink-soft);
  max-width: 560px;
  margin: 0 auto 32px;
}
.cta-row { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-weight: 600; font-size: 16px;
  padding: 13px 24px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--ink);
  cursor: pointer;
}
.btn:hover { text-decoration: none; border-color: #d8d2c6; }
.btn.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn.primary:hover { background: var(--accent-strong); border-color: var(--accent-strong); }
.btn.disabled { opacity: .6; cursor: default; pointer-events: none; }

/* ---------- Feature grid ---------- */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
  padding: 24px 0 56px;
}
.feature {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}
.feature .emoji { font-size: 26px; line-height: 1; }
.feature h3 { margin: 14px 0 6px; font-size: 18px; }
.feature p { margin: 0; color: var(--ink-soft); font-size: 15.5px; }

.section-title {
  text-align: center;
  font-size: clamp(24px, 4vw, 32px);
  letter-spacing: -.02em;
  margin: 40px 0 6px;
}
.section-sub { text-align: center; color: var(--ink-soft); margin: 0 0 8px; }

/* ---------- FAQ ---------- */
.faq details {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 4px 18px;
  margin: 10px 0;
  box-shadow: var(--shadow);
}
.faq summary {
  cursor: pointer;
  font-weight: 600;
  padding: 14px 0;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; float: right; color: var(--ink-faint); font-weight: 400; }
.faq details[open] summary::after { content: "–"; }
.faq details p { margin: 0 0 16px; color: var(--ink-soft); }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 40px;
  padding: 32px clamp(16px, 4vw, 32px);
  color: var(--ink-faint);
  font-size: 14px;
}
.site-footer .wrap {
  display: flex; flex-wrap: wrap; gap: 14px 26px; align-items: center;
}
.site-footer nav { display: flex; gap: 20px; flex-wrap: wrap; }
.site-footer a { color: var(--ink-soft); }
.site-footer .copy { margin-left: auto; }

@media (max-width: 560px) {
  body { font-size: 16px; }
  .site-footer .copy { margin-left: 0; width: 100%; }
}

@media (max-width: 440px) {
  .site-header { gap: 12px; }
  .brand { gap: 0; font-size: 0; }
  .site-header nav { gap: 10px; }
  .lang-toggle { padding-inline: 11px; }
}
