@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,500;9..144,650;9..144,750&family=Noto+Sans+SC:wght@400;500;600;700;800&family=Noto+Serif+SC:wght@500;600;700&display=swap');

:root {
  --bg: #fff5f0;
  --surface: #ffffff;
  --surface-alt: #f6eaf4;
  --surface-hover: #f5cdcf;
  --border: #ebceca;
  --border-hover: #cf8587;
  --text: #403740;
  --text-secondary: #71646b;
  --text-tertiary: #978a91;
  --accent: #e77d80;
  --accent-hover: #ce666b;
  --accent-rgb: 231, 125, 128;
  --success: #6f9562;
  --warning: #cb843f;
  --error: #d95f7f;
  --soft-pink: #f9dfe0;
  --soft-blue: #dff1ef;
  --soft-mint: #e8f3dc;
  --sky: #c6e8e6;
  --berry: #7d4661;
  --radius-sm: 10px;
  --radius: 14px;
  --shadow: 0 14px 36px rgba(94, 59, 73, .11);
  --font: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 7% 3%, rgba(248, 201, 199, .34), transparent 26rem),
    radial-gradient(circle at 94% 8%, rgba(198, 232, 230, .4), transparent 28rem),
    radial-gradient(circle at 78% 58%, rgba(246, 234, 244, .48), transparent 30rem),
    var(--bg);
  font-family: var(--font);
  line-height: 1.75;
  letter-spacing: .015em;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }
button, input { font: inherit; }
.skip-link {
  position: fixed; left: 16px; top: 12px; z-index: 999; transform: translateY(-180%);
  padding: 10px 14px; border-radius: 8px; background: var(--accent); color: #ffffff;
}
.skip-link:focus-visible { transform: translateY(0); }
.container { width: min(1180px, calc(100% - 48px)); margin: 0 auto; }

.site-header {
  position: sticky; top: 12px; z-index: 50; padding-top: 12px;
  background: transparent;
}
.nav { min-height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 10px 14px 10px 18px; border-radius: 28px; background: var(--accent); box-shadow: 0 12px 30px rgba(139, 70, 78, .14); }
.brand { display: inline-flex; align-items: center; flex: 0 0 auto; }
.brand-logo { display: block; width: 150px; height: 48px; overflow: hidden; }
.brand-logo img { display: block; width: 150px; height: 150px; margin-top: -51px; object-fit: cover; mix-blend-mode: multiply; }
.nav-links { display: flex; flex-wrap: nowrap; align-items: center; gap: 6px; }
.nav-links a {
  min-height: 42px; display: inline-flex; align-items: center; padding: 8px 13px;
  flex: 0 0 auto; border-radius: 12px; color: rgba(255,255,255,.92); font-size: .88rem; font-weight: 650; white-space: nowrap;
}
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--text); background: var(--sky); }
.nav-cta { border: 1px solid rgba(255,255,255,.7); }

.hero { position: relative; padding: 84px 0 58px; animation: enter .42s ease both; }
.hero::after { content: "✦"; position: absolute; top: 62px; right: 2%; color: rgba(240, 138, 167, .5); font-size: 2.2rem; transform: rotate(12deg); }
.eyebrow { color: var(--accent); font-size: .76rem; font-weight: 800; letter-spacing: .11em; text-transform: uppercase; }
.hero h1 {
  max-width: 830px; margin: 14px 0 18px; font-size: clamp(2.3rem, 6vw, 4.5rem);
  font-family: "Noto Serif SC", Fraunces, Georgia, serif; font-weight: 650;
  line-height: 1.12; letter-spacing: -.04em; color: var(--text);
}
.hero h1::first-line { color: var(--accent); }
.hero p { max-width: 760px; margin: 0; color: var(--text-secondary); font-size: clamp(1rem, 2vw, 1.12rem); }
.hero-meta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.meta-chip, .tag {
  display: inline-flex; align-items: center; min-height: 32px; padding: 5px 10px;
  color: var(--text-secondary); background: var(--surface); border: 1px solid var(--border); border-radius: 999px;
  font-size: .76rem; font-weight: 650;
}
.meta-chip::before { content: ""; width: 7px; height: 7px; margin-right: 8px; border-radius: 50%; background: var(--success); }

.section { padding: 28px 0 76px; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 24px; }
.section-title { margin: 0; font-size: 1.75rem; line-height: 1.25; letter-spacing: -.02em; }
.section-note { margin: 5px 0 0; color: var(--text-tertiary); font-size: .9rem; }

.search-wrap { position: relative; margin: 0 0 24px; }
.search-icon { position: absolute; left: 16px; top: 50%; width: 18px; height: 18px; transform: translateY(-50%); color: var(--text-tertiary); pointer-events: none; }
.search-input {
  width: 100%; height: 54px; padding: 0 52px 0 48px; color: var(--text);
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); outline: none;
}
.search-input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(var(--accent-rgb), .15); }
.search-count { position: absolute; right: 14px; top: 50%; transform: translateY(-50%); color: var(--text-tertiary); font-size: .75rem; }

.filter-row { display: flex; gap: 9px; margin-bottom: 26px; overflow-x: auto; scrollbar-width: thin; padding-bottom: 3px; }
.filter-btn, .toc-btn {
  border: 1px solid var(--border); color: var(--text-secondary); background: var(--surface);
  border-radius: 999px; padding: 9px 14px; cursor: pointer; white-space: nowrap; transition: .18s ease;
}
.filter-btn:hover, .filter-btn.active, .toc-btn:hover, .toc-btn.active { color: var(--text); border-color: rgba(var(--accent-rgb), .55); background: rgba(var(--accent-rgb), .12); }
.filter-btn:focus-visible, .toc-btn:focus-visible, .tool-link:focus-visible, summary:focus-visible, .nav-links a:focus-visible {
  outline: 3px solid rgba(var(--accent-rgb), .3); outline-offset: 2px;
}

.tool-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.tool-card {
  display: flex; flex-direction: column; min-height: 245px; padding: 23px;
  background: linear-gradient(145deg, var(--surface), var(--surface-alt)); border: 1px solid var(--border);
  border-radius: 20px; box-shadow: 0 8px 26px rgba(73, 52, 93, .05); transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}
.tool-card:nth-child(4n + 1) { background: linear-gradient(145deg, var(--surface), var(--soft-blue)); }
.tool-card:nth-child(4n + 2) { background: linear-gradient(145deg, var(--surface), var(--soft-pink)); }
.tool-card:nth-child(4n + 3) { background: linear-gradient(145deg, var(--surface), var(--surface-alt)); }
.tool-card:nth-child(4n + 4) { background: linear-gradient(145deg, var(--surface), var(--soft-mint)); }
.tool-card:hover { transform: translateY(-2px); border-color: var(--border-hover); box-shadow: var(--shadow); }
.tool-card.hidden { display: none; }
.tool-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.tool-logo {
  display: grid; place-items: center; width: 43px; height: 43px; border-radius: 11px;
  color: var(--accent); background: rgba(var(--accent-rgb), .09); border: 1px solid rgba(var(--accent-rgb), .2);
  font-weight: 800; letter-spacing: -.03em;
}
.official { color: var(--success); font-size: .72rem; font-weight: 700; }
.unofficial { color: var(--warning); font-size: .72rem; font-weight: 700; }
.tool-card h2 { margin: 20px 0 5px; font-size: 1.1rem; }
.tool-card p { flex: 1; margin: 0 0 18px; color: var(--text-secondary); font-size: .88rem; }
.tool-tags { display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: 18px; }
.tag { min-height: 26px; background: transparent; font-size: .68rem; }
.tool-link { display: inline-flex; align-items: center; justify-content: space-between; min-height: 42px; padding: 8px 12px; border-radius: 9px; background: rgba(var(--accent-rgb), .1); font-size: .84rem; font-weight: 700; }
.tool-links { display: grid; gap: 8px; }
.empty { display: none; padding: 42px; color: var(--text-secondary); text-align: center; border: 1px dashed var(--border); border-radius: var(--radius); }
.empty.show { display: block; }
.notice { padding: 16px 18px; margin: 0 0 28px; color: var(--text-secondary); background: #fff8eb; border: 1px solid #efd9b7; border-radius: 14px; font-size: .86rem; }
.notice strong { color: var(--warning); }

.guide-layout { display: grid; grid-template-columns: 260px minmax(0, 1fr); align-items: start; gap: 30px; padding-bottom: 80px; }
.toc { position: sticky; top: 92px; display: grid; gap: 8px; }
.toc-label { margin: 0 0 7px; color: var(--text-tertiary); font-size: .72rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.toc-btn { width: 100%; min-height: 46px; border-radius: 10px; text-align: left; }
.guide-panel { display: none; animation: panel .18s ease both; }
.guide-panel.active { display: block; }
.guide-panel > header { margin-bottom: 26px; }
.guide-panel h2 { margin: 0 0 9px; font-size: clamp(1.7rem, 3vw, 2.2rem); letter-spacing: -.03em; }
.guide-panel > header p { margin: 0; color: var(--text-secondary); }
.lesson {
  margin-bottom: 14px; background: rgba(255,255,255,.9); border: 1px solid var(--border); border-radius: 18px; overflow: hidden; box-shadow: 0 7px 24px rgba(73,52,93,.045);
}
.lesson:nth-of-type(4n + 1) { background: linear-gradient(145deg, var(--surface), var(--soft-blue)); }
.lesson:nth-of-type(4n + 2) { background: linear-gradient(145deg, var(--surface), var(--soft-pink)); }
.lesson:nth-of-type(4n + 3) { background: linear-gradient(145deg, var(--surface), var(--surface-alt)); }
.lesson:nth-of-type(4n + 4) { background: linear-gradient(145deg, var(--surface), var(--soft-mint)); }
.lesson[open] { border-color: var(--border-hover); }
.lesson summary {
  min-height: 62px; display: flex; align-items: center; justify-content: space-between; gap: 20px;
  padding: 16px 20px; cursor: pointer; list-style: none; font-weight: 750;
}
.lesson summary::-webkit-details-marker { display: none; }
.lesson summary::after { content: "+"; color: var(--accent); font-size: 1.3rem; font-weight: 400; }
.lesson[open] summary::after { content: "−"; }
.lesson-body { padding: 0 20px 22px; color: var(--text-secondary); }
.lesson-body h3 { margin: 24px 0 8px; color: var(--text); font-size: 1rem; }
.lesson-body p { margin: 0 0 14px; }
.lesson-body ul, .lesson-body ol { margin: 8px 0 18px; padding-left: 22px; }
.lesson-body li { margin-bottom: 7px; }
.lesson-body strong { color: var(--text); }
.lesson-body code, .code-block { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.code-block { padding: 14px 16px; overflow-x: auto; color: #513d85; background: #f4efff; border: 1px solid #dfd2f0; border-radius: 11px; font-size: .84rem; }
.callout { padding: 15px 17px; margin: 16px 0; background: rgba(var(--accent-rgb), .075); border-left: 3px solid var(--accent); border-radius: 0 9px 9px 0; }
.intent-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin: 14px 0; }
.intent-item { padding: 14px; background: rgba(255,255,255,.74); border: 1px solid var(--border); border-radius: 14px; }
.intent-item strong { display: block; margin-bottom: 4px; color: var(--accent); }
.guide-search-results { display: none; margin-bottom: 22px; }
.guide-search-results.show { display: block; }
.result-btn {
  width: 100%; margin-bottom: 8px; padding: 12px 14px; text-align: left; color: var(--text-secondary);
  background: var(--surface); border: 1px solid var(--border); border-radius: 9px; cursor: pointer;
}
.result-btn:hover { color: var(--text); border-color: var(--border-hover); }

.site-footer { padding: 34px 0 44px; border-top: 0; color: rgba(255,255,255,.82); background: var(--berry); font-size: .82rem; }
.site-footer a { color: rgba(255,255,255,.86); }
.site-footer a:hover { color: var(--sky); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.footer-links { display: flex; gap: 16px; }

@keyframes enter { from { opacity: 0; transform: translateY(10px); } }
@keyframes panel { from { opacity: 0; transform: translateY(5px); } }

@media (max-width: 980px) {
  .tool-grid { grid-template-columns: repeat(2, 1fr); }
  .guide-layout { grid-template-columns: 1fr; gap: 22px; }
  .toc { position: sticky; top: 68px; z-index: 30; grid-auto-flow: column; grid-auto-columns: max-content; overflow-x: auto; margin: 0 -24px; padding: 12px 24px; background: rgba(255, 250, 247, .94); border-bottom: 1px solid var(--border); }
  .toc-label { display: none; }
  .toc-btn { width: auto; }
}

@media (max-width: 680px) {
  .container { width: min(100% - 32px, 1180px); }
  .site-header { position: static; padding-top: 8px; }
  .nav { align-items: flex-start; flex-direction: column; gap: 8px; padding: 13px; border-radius: 22px; }
  .brand-logo { width: 138px; height: 44px; }
  .brand-logo img { width: 138px; height: 138px; margin-top: -47px; }
  .nav-links { width: 100%; overflow-x: auto; }
  .nav-links a { padding: 7px 10px; }
  .nav-cta { display: none !important; }
  .hero { padding: 58px 0 42px; }
  .hero::after { top: 38px; right: 0; font-size: 1.5rem; }
  .tool-grid { grid-template-columns: 1fr; }
  .tool-card { min-height: 0; }
  .section-head, .footer-inner { align-items: flex-start; flex-direction: column; }
  .intent-grid { grid-template-columns: 1fr; }
  .toc { top: 111px; margin: 0 -16px; padding-inline: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; scroll-behavior: auto !important; transition-duration: .01ms !important; }
}