/* ===========================================================
   音老木 官網設計系統
   基調：黑白極簡 + 銅金點綴（呼應薩克斯風意象）+ 五線譜分隔線元素
   =========================================================== */

:root {
  --color-bg: #0b0b0c;
  --color-bg-elevated: #17171a;
  --color-bg-card: #1d1d21;
  --color-text: #f5f4f1;
  --color-text-muted: #a9a7a2;
  --color-border: rgba(245, 244, 241, 0.12);
  --color-accent: #b98d4e;      /* 銅金主色 */
  --color-accent-soft: rgba(185, 141, 78, 0.16);
  --color-accent-text: #d9b57c;

  --font-sans: "Noto Sans TC", -apple-system, BlinkMacSystemFont, "PingFang TC", "Microsoft JhengHei", sans-serif;
  --font-serif: "Noto Serif TC", "Noto Sans TC", serif;

  --container-width: 1120px;
  --radius-lg: 28px;
  --radius-md: 16px;
  --nav-height: 72px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

a { color: inherit; }

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--color-accent);
  color: #0b0b0c;
  padding: 12px 20px;
  z-index: 999;
}
.skip-link:focus { left: 12px; top: 12px; }

/* ---------- 導覽列（固定頂部，滾動毛玻璃） ---------- */

.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  z-index: 100;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color .3s ease, border-color .3s ease, backdrop-filter .3s ease;
}
.site-nav.is-scrolled {
  background: rgba(11, 11, 12, 0.72);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom-color: var(--color-border);
}
.site-nav__inner {
  max-width: var(--container-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.site-nav__brand {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.3rem;
  text-decoration: none;
  letter-spacing: .04em;
}
.site-nav__links {
  display: flex;
  gap: 32px;
}
.site-nav__link {
  text-decoration: none;
  font-size: .95rem;
  color: var(--color-text-muted);
  position: relative;
  padding: 4px 0;
  transition: color .2s ease;
}
.site-nav__link:hover,
.site-nav__link:focus-visible,
.site-nav__link[aria-current="page"] {
  color: var(--color-accent-text);
}
.site-nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 8px;
}
.site-nav__toggle span {
  width: 22px; height: 2px;
  background: var(--color-text);
  display: block;
}

/* ---------- 版面容器 ---------- */

main { display: block; padding-top: var(--nav-height); }

.section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 72px 24px;
}
.section--tight { padding-top: 40px; padding-bottom: 40px; }

.eyebrow {
  display: inline-block;
  font-size: .8rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--color-accent-text);
  margin-bottom: 12px;
}

/* ---------- 首頁開場 ---------- */

.hero {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 96px 24px 64px;
}
.hero__title {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  line-height: 1.15;
  margin: 0 0 28px;
}
.hero__lede {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  max-width: 640px;
  margin: 0 0 8px;
}
.hero__lede a {
  color: var(--color-text);
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-underline-offset: 4px;
}
.hero__lede a:hover { color: var(--color-accent-text); }

/* ---------- 六頁入口網格（首頁） ---------- */

.entry-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 48px;
}
.entry-card {
  display: block;
  padding: 28px 24px;
  border-radius: var(--radius-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  text-decoration: none;
  transition: border-color .2s ease, transform .2s ease;
}
.entry-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-3px);
}
.entry-card__num {
  font-family: var(--font-serif);
  color: var(--color-accent-text);
  font-size: .85rem;
  margin-bottom: 10px;
  display: block;
}
.entry-card__title {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0 0 8px;
}
.entry-card__desc {
  font-size: .9rem;
  color: var(--color-text-muted);
  margin: 0;
}

/* ---------- 人物照片區塊 ---------- */

.portrait {
  width: 100%;
  aspect-ratio: 21 / 9;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, #1d1d21 0%, #0b0b0c 60%, #2a2118 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: .9rem;
  border: 1px dashed var(--color-border);
}

/* ---------- 五線譜分隔線 ---------- */

.staff-divider {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 8px 24px;
  opacity: .35;
}
.staff-divider svg {
  width: 100%;
  height: 24px;
}
.staff-divider line {
  stroke: var(--color-accent);
  stroke-width: 1;
}

/* ---------- 關於頁 4 區塊 ---------- */

.about-blocks {
  display: grid;
  gap: 56px;
}
.about-block__title {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  margin: 0 0 14px;
}
.about-block__body {
  color: var(--color-text-muted);
  max-width: 720px;
}
.placeholder-note {
  display: inline-block;
  margin-top: 10px;
  font-size: .82rem;
  color: var(--color-accent-text);
  border: 1px dashed var(--color-accent);
  padding: 3px 10px;
  border-radius: 100px;
}

/* ---------- 文章：分類卡片網格 ---------- */

.category-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 32px;
}
.category-card {
  padding: 24px;
  border-radius: var(--radius-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
}
.category-card__title { margin: 0 0 6px; font-size: 1.05rem; }
.category-card__desc { margin: 0; color: var(--color-text-muted); font-size: .9rem; }

.post-list { list-style: none; padding: 0; margin: 40px 0 0; }
.post-list li {
  padding: 18px 0;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: baseline;
  gap: 16px;
}
.post-list a { text-decoration: none; font-weight: 500; }
.post-list a:hover { color: var(--color-accent-text); }
.post-list .post-tag {
  font-size: .78rem;
  color: var(--color-accent-text);
  border: 1px solid var(--color-accent);
  padding: 2px 10px;
  border-radius: 100px;
  flex-shrink: 0;
}

/* ---------- 作品頁：對照展示卡片 ---------- */

.work-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  margin-bottom: 32px;
}
.work-card:nth-child(even) { direction: rtl; }
.work-card:nth-child(even) > * { direction: ltr; }
.work-card__media {
  aspect-ratio: 4 / 3;
  background: linear-gradient(135deg, #241c14, #0b0b0c);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-text-muted);
  font-size: .85rem;
}
.work-card__body {
  padding: 36px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.work-card__title { font-size: 1.3rem; margin: 0 0 10px; }
.work-card__desc { color: var(--color-text-muted); margin: 0 0 20px; }

.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 100px;
  text-decoration: none;
  font-size: .92rem;
  font-weight: 600;
  width: fit-content;
}
.btn--primary { background: var(--color-text); color: #0b0b0c; }
.btn--primary:hover { background: var(--color-accent-text); }
.btn--outline { background: transparent; border: 1px solid var(--color-border); color: var(--color-text); }
.btn--outline:hover { border-color: var(--color-accent); color: var(--color-accent-text); }

.cta-row { display: flex; gap: 16px; margin-top: 48px; flex-wrap: wrap; }

/* ---------- 聯絡頁：報價摘要 + 表單 ---------- */

.pricing-summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 32px 0 48px;
}
.pricing-tier {
  padding: 24px;
  border-radius: var(--radius-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  text-align: center;
}
.pricing-tier__name { font-size: .9rem; color: var(--color-text-muted); margin: 0 0 8px; }
.pricing-tier__price { font-family: var(--font-serif); font-size: 1.6rem; margin: 0; color: var(--color-accent-text); }

.inquiry-box {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 40px;
}
.inquiry-box__fields {
  display: grid;
  gap: 14px;
  margin: 24px 0;
  color: var(--color-text-muted);
  font-size: .92rem;
}
.inquiry-box__fields li { list-style: none; padding-left: 18px; position: relative; }
.inquiry-box__fields li::before {
  content: "—";
  position: absolute; left: 0; color: var(--color-accent);
}

.contact-secondary {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: .92rem;
}

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 56px 24px 28px;
}
.site-footer__grid {
  max-width: var(--container-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.6fr repeat(4, 1fr);
  gap: 24px;
}
.site-footer__brand { font-family: var(--font-serif); font-weight: 700; font-size: 1.1rem; margin: 0 0 8px; }
.site-footer__tagline { color: var(--color-text-muted); font-size: .88rem; max-width: 220px; }
.site-footer__heading { font-size: .8rem; color: var(--color-text-muted); text-transform: uppercase; letter-spacing: .08em; margin: 0 0 12px; }
.site-footer__col a { display: block; text-decoration: none; font-size: .92rem; padding: 4px 0; color: var(--color-text); }
.site-footer__col a:hover { color: var(--color-accent-text); }
.site-footer__bottom {
  max-width: var(--container-width);
  margin: 40px auto 0;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
  font-size: .8rem;
  color: var(--color-text-muted);
}

/* ---------- RWD ---------- */

@media (max-width: 860px) {
  .entry-grid { grid-template-columns: repeat(2, 1fr); }
  .category-grid { grid-template-columns: 1fr; }
  .work-card, .work-card:nth-child(even) { grid-template-columns: 1fr; direction: ltr; }
  .pricing-summary { grid-template-columns: 1fr; }
  .site-footer__grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .site-nav__links { display: none; }
  .site-nav__toggle { display: flex; }
  .entry-grid { grid-template-columns: 1fr; }
  .site-footer__grid { grid-template-columns: 1fr; gap: 32px; }
}