/* ============================================================
   Amy Design — design.amy-bot.com
   Brand SSoT: obsidian/06_產品線/07_網站設計接案/brand-spec.md
   主流派 A3 Swiss International ／ 輔流派 E3 台灣書籍編排
   色彩紀律：electric blue #3B82F6 為唯一強色，僅作品區活躍
   ============================================================ */

:root {
  --black: #0A0A0A;
  --blue: #3B82F6;
  --white: #FFFFFF;
  --surface: #F9FAFB;
  --text: #111827;
  --muted: #6B7280;
  --line: #E5E7EB;
  --line-dark: #0A0A0A;
  --font-sans: "Inter", "Noto Sans TC", -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", monospace;
  --max: 1200px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--white);
  color: var(--text);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

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

/* ---- 微標籤（Swiss mono microlabel） ---- */
.microlabel {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
}

.index-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--black);
  letter-spacing: 0.1em;
}

/* ---- Nav ---- */
header.site {
  border-bottom: 1px solid var(--line-dark);
  position: sticky;
  top: 0;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(6px);
  z-index: 50;
}
.nav {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  height: 64px;
}
.nav .wordmark {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: -0.02em;
  font-size: 1.05rem;
}
.nav .wordmark .dot {
  width: 10px; height: 10px;
  background: var(--blue);
}
.nav ul {
  display: flex;
  align-items: stretch;
}
.nav ul li a {
  display: flex;
  align-items: center;
  height: 100%;
  padding: 0 20px;
  font-size: 0.85rem;
  font-weight: 500;
  border-left: 1px solid var(--line);
  transition: background 0.15s;
}
.nav ul li a:hover { background: var(--surface); }
.nav ul li a.active { background: var(--black); color: var(--white); }
.nav ul li a.cta { background: var(--black); color: var(--white); }
.nav ul li a.cta:hover { background: var(--blue); }

/* ---- Hero（Swiss poster 式） ---- */
.hero {
  border-bottom: 1px solid var(--line-dark);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr 280px;
  min-height: 66vh;
}
.hero-main {
  padding: 96px 24px 72px 24px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}
.hero-main h1 {
  font-size: clamp(2.8rem, 7.5vw, 5.5rem);
  font-weight: 800;
  line-height: 1.04;
  letter-spacing: -0.035em;
  color: var(--black);
  margin: 20px 0 28px;
}
.hero-main h1 .blue { color: var(--blue); }
.hero-main .lede {
  font-size: 1.05rem;
  color: var(--muted);
  max-width: 34em;
}
.hero-side {
  border-left: 1px solid var(--line-dark);
  padding: 96px 28px 72px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 40px;
}
.hero-side .vertical {
  writing-mode: vertical-rl;
  font-size: 0.8rem;
  letter-spacing: 0.5em;
  color: var(--black);
  font-weight: 500;
  align-self: flex-end;
}
.hero-side .meta { display: grid; gap: 18px; }
.hero-side .meta div { border-top: 1px solid var(--line); padding-top: 10px; }
.hero-side .meta b { display: block; font-size: 0.9rem; font-weight: 600; }

/* ---- Section 骨架 ---- */
section.block { border-bottom: 1px solid var(--line-dark); }
.block-head {
  display: flex;
  align-items: baseline;
  gap: 18px;
  padding: 56px 0 36px;
}
.block-head h2 {
  font-size: clamp(1.6rem, 3.2vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
}
.block-body { padding-bottom: 72px; }

/* ---- 流程（4 步橫列） ---- */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line-dark);
  border-left: 1px solid var(--line-dark);
}
.step {
  border-right: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
  padding: 28px 22px 40px;
  background: var(--white);
  transition: background 0.15s;
}
.step:hover { background: var(--surface); }
.step .index-num { display: block; margin-bottom: 36px; }
.step h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; }
.step p { font-size: 0.88rem; color: var(--muted); }

/* ---- 作品卡（唯一 blue 活躍區） ---- */
.works {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
}
.work {
  background: var(--white);
  padding: 0;
  display: flex;
  flex-direction: column;
  transition: background 0.15s;
}
.work:hover { background: var(--surface); }
.work .thumb {
  aspect-ratio: 4 / 3;
  border-bottom: 1px solid var(--line);
  position: relative;
  overflow: hidden;
  background: var(--surface);
}
/* CSS 繪製之抽象縮圖（截圖素材未備前的風格化占位，見設計決策） */
.thumb .bar {
  position: absolute; top: 0; left: 0; right: 0; height: 22px;
  background: var(--white); border-bottom: 1px solid var(--line);
  display: flex; align-items: center; gap: 5px; padding: 0 10px;
}
.thumb .bar i {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--line); display: block;
}
.thumb .comp { position: absolute; inset: 22px 0 0 0; }
.work .info { padding: 18px 20px 22px; }
.work .info .microlabel { display: block; margin-bottom: 6px; }
.work .info h3 { font-size: 1rem; font-weight: 700; letter-spacing: -0.01em; }
.work .info p { font-size: 0.85rem; color: var(--muted); margin-top: 4px; }
.work:hover .info h3 { color: var(--blue); }

/* 篩選列 */
.filters { display: flex; flex-wrap: wrap; gap: 0; border: 1px solid var(--line-dark); width: fit-content; margin-bottom: 36px; }
.filters button {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  padding: 10px 18px;
  background: var(--white);
  border: none;
  border-right: 1px solid var(--line-dark);
  cursor: pointer;
  color: var(--text);
}
.filters button:last-child { border-right: none; }
.filters button:hover { background: var(--surface); }
.filters button.on { background: var(--black); color: var(--white); }

/* ---- 方案 ---- */
.tiers {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
}
.tier { background: var(--white); padding: 32px 28px 40px; display: flex; flex-direction: column; }
.tier.featured { outline: 2px solid var(--black); outline-offset: -2px; }
.tier .microlabel { margin-bottom: 14px; }
.tier h3 { font-size: 1.3rem; font-weight: 800; letter-spacing: -0.02em; }
.tier .scope { font-size: 0.85rem; color: var(--muted); margin: 4px 0 22px; }
.tier .price {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  padding: 14px 0;
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line);
  margin-bottom: 8px;
}
.tier .price small { display: block; font-size: 0.68rem; font-weight: 400; color: var(--muted); letter-spacing: 0.08em; margin-top: 4px; }
.pending {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  border: 1px solid var(--black);
  padding: 2px 8px;
  margin-bottom: 20px;
  width: fit-content;
}
.tier ul { display: grid; gap: 8px; flex: 1; }
.tier ul li {
  font-size: 0.88rem;
  padding-left: 20px;
  position: relative;
}
.tier ul li::before {
  content: "—";
  position: absolute; left: 0;
  color: var(--blue);
  font-weight: 700;
}
.tier ul li.no { color: var(--muted); }
.tier ul li.no::before { content: "×"; color: var(--line); }

/* ---- FAQ ---- */
.faq { border-top: 1px solid var(--line-dark); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary {
  cursor: pointer;
  padding: 20px 4px;
  font-weight: 600;
  font-size: 0.98rem;
  display: flex;
  gap: 16px;
  align-items: baseline;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary .index-num { color: var(--muted); }
.faq details[open] summary { color: var(--blue); }
.faq .a { padding: 0 4px 24px 52px; font-size: 0.9rem; color: var(--muted); max-width: 42em; }

/* ---- CTA band ---- */
.cta-band {
  background: var(--black);
  color: var(--white);
}
.cta-band .inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 72px 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.cta-band h2 { font-size: clamp(1.6rem, 3.5vw, 2.6rem); font-weight: 800; letter-spacing: -0.03em; }
.btn {
  display: inline-block;
  padding: 14px 32px;
  font-size: 0.9rem;
  font-weight: 700;
  border: 1px solid var(--black);
  background: var(--black);
  color: var(--white);
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.btn:hover { background: var(--blue); border-color: var(--blue); }
.btn.ghost { background: transparent; color: var(--black); }
.btn.ghost:hover { background: var(--black); color: var(--white); }
.cta-band .btn { background: var(--white); color: var(--black); border-color: var(--white); }
.cta-band .btn:hover { background: var(--blue); color: var(--white); border-color: var(--blue); }

/* ---- 聯絡頁 ---- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
}
.contact-cell { background: var(--white); padding: 32px 28px; }
.contact-cell h3 { font-size: 1rem; font-weight: 700; margin-bottom: 14px; }
.contact-cell .big {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  word-break: break-all;
}
.contact-cell ol { padding-left: 1.2em; font-size: 0.9rem; color: var(--muted); display: grid; gap: 6px; }
.contact-cell ul.plain { display: grid; gap: 6px; font-size: 0.9rem; color: var(--muted); }
.contact-cell ul.plain li { padding-left: 20px; position: relative; }
.contact-cell ul.plain li::before { content: "—"; position: absolute; left: 0; color: var(--blue); font-weight: 700; }

/* ---- Footer ---- */
footer.site {
  border-top: 1px solid var(--line-dark);
}
footer.site .inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 40px 24px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px;
  font-size: 0.8rem;
  color: var(--muted);
}
footer.site .microlabel { color: var(--muted); }

/* ---- RWD ---- */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-side { border-left: none; border-top: 1px solid var(--line-dark); padding: 32px 24px; flex-direction: row; align-items: center; }
  .hero-side .vertical { writing-mode: horizontal-tb; letter-spacing: 0.3em; align-self: center; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .works { grid-template-columns: repeat(2, 1fr); }
  .tiers { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .nav ul li a { padding: 0 12px; font-size: 0.78rem; }
  .steps { grid-template-columns: 1fr; }
  .works { grid-template-columns: 1fr; }
  .hero-main { padding-top: 64px; }
}