/* 內頁主題變數 */
:root {
  --ink: #171612;
  --title-ink: #37250f;
  --muted: #54564f;
  --paper: #f7f2df;
  --text-panel: rgba(239, 247, 236, 0.82);
  --paper-soft: var(--text-panel);
  --sky: #c9e0ec;
  --mountain: #6f9d82;
  --mountain-dark: #285e53;
  --water: #8ac6bc;
  --field: #efc96f;
  --accent: #528d44;
  --line: rgba(23, 22, 18, 0.16);
  --shadow: 0 22px 60px rgba(40, 94, 83, 0.17);
  --shadow-soft: 0 12px 34px rgba(55, 37, 15, 0.1);
  --page-gutter: clamp(18px, 4vw, 48px);
  --header-gutter: clamp(18px, 5vw, 72px);
  --radius-large: 10px;
  --content: 1180px;
}

/* 基礎重設與頁面背景 */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: clamp(93.75%, calc(87.5% + 0.35vw), 112.5%);
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family:
    "Noto Serif TC", "Source Han Serif TC", "PingFang TC", "Microsoft JhengHei",
    serif;
  line-height: 1.8;
  overflow-x: clip;
  isolation: isolate;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -3;
  content: "";
  background:
    linear-gradient(
      180deg,
      rgba(201, 224, 236, 0.92),
      rgba(111, 157, 130, 0.62) 48%,
      rgba(239, 201, 111, 0.74) 76%,
      rgba(138, 198, 188, 0.76)
    ),
    repeating-linear-gradient(
      0deg,
      rgba(23, 22, 18, 0.02) 0 1px,
      transparent 1px 5px
    );
}

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

a {
  color: inherit;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  color: #37250f;
  text-wrap: balance;
}

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 100;
  padding: 10px 16px;
  color: #fff;
  background: var(--mountain-dark);
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

/* 固定頁首與主要導覽 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: rgba(247, 242, 223, 0.9);
  backdrop-filter: blur(14px);
}

.header-inner {
  width: calc(100% - var(--header-gutter) - var(--header-gutter));
  min-height: 0;
  margin: 0 auto;
  padding-block: clamp(10px, calc(2.2vw - 8px), 20px);
  display: flex;
  align-items: center;
  gap: clamp(20px, 3vw, 46px);
}

.brand {
  margin-right: auto;
  display: inline-flex;
  align-items: baseline;
  gap: 0.08em;
  color: var(--title-ink);
  text-decoration: none;
  font-size: clamp(1.1rem, 1.45vw, 1.3rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.brand span {
  display: inline;
  color: var(--mountain-dark);
  font-size: inherit;
  font-weight: 800;
  letter-spacing: 0.18em;
}

.site-nav ul {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.2vw, 34px);
  margin: 0;
  padding: 0;
  list-style: none;
}

/* 桌面版將回首頁與內容導覽稍作分組，保留連續、緊湊的視覺節奏。 */
@media (min-width: 901px) {
  .site-nav li:first-child {
    margin-right: 18px;
  }

  .site-nav a {
    width: 5rem;
  }
}

.site-nav a {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px 10px;
  border-radius: 4px;
  text-decoration: none;
  font-size: 1.0625rem;
  font-weight: 800;
  line-height: normal;
  letter-spacing: normal;
  text-align: center;
  white-space: nowrap;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: #fff;
  background: var(--mountain-dark);
}

.menu-toggle {
  display: none;
  width: 46px;
  height: 46px;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--ink);
  background: var(--field);
  font: inherit;
  font-size: 1.25rem;
  cursor: pointer;
}

/* 版面容器與首頁首屏（亦供部分內頁元件使用） */
.container {
  width: min(
    calc(100% - var(--page-gutter) - var(--page-gutter)),
    var(--content)
  );
  margin: 0 auto;
}

.hero {
  min-height: calc(100vh - 88px);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.85fr);
  align-items: center;
  gap: clamp(40px, 8vw, 110px);
  padding-block: clamp(70px, 10vw, 140px);
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--mountain-dark);
  font-weight: 900;
  letter-spacing: 0.1em;
}

.hero h1,
.page-hero h1 {
  margin: 0;
  font-size: clamp(3rem, 7vw, 6.5rem);
  line-height: 1.08;
  letter-spacing: 0.06em;
}
.page-hero h2 {
  font-size: clamp(2rem, 3vw, 4.5rem);
  line-height: 1.08;
  letter-spacing: 0.06em;
  margin-top: 1rem;
  margin-bottom: 1rem;
}

.hero h1 span {
  display: block;
  margin-top: 16px;
  color: var(--mountain-dark);
  font-size: clamp(1.45rem, 3vw, 2.7rem);
  letter-spacing: 0.16em;
}

.hero-copy {
  max-width: 650px;
  margin: 28px 0 0;
  font-size: clamp(1.05rem, 1.8vw, 1.3rem);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 10px 24px;
  border: 2px solid var(--mountain-dark);
  border-radius: 999px;
  color: #fff;
  background: var(--mountain-dark);
  text-decoration: none;
  font-weight: 900;
}

.button.secondary {
  color: var(--mountain-dark);
  background: rgba(247, 242, 223, 0.72);
}

.map-frame {
  position: relative;
  margin: 0;
  border: 12px solid rgba(247, 242, 223, 0.74);
  box-shadow: var(--shadow);
  transform: rotate(1.5deg);
}

.map-frame::after {
  position: absolute;
  inset: 0;
  content: "";
  border: 2px solid rgba(23, 22, 18, 0.18);
  box-shadow: inset 0 0 60px rgba(40, 94, 83, 0.2);
  pointer-events: none;
}

.map-frame img {
  width: 100%;
  height: clamp(440px, 58vw, 660px);
  object-fit: cover;
}

.map-frame picture {
  display: block;
}

.map-frame figcaption {
  position: absolute;
  right: 18px;
  bottom: 16px;
  padding: 4px 10px;
  background: var(--text-panel);
  backdrop-filter: blur(10px);
  font-size: 0.78rem;
}

/* 通用內容區塊、面板與卡片 */
.section {
  padding-block: clamp(72px, 9vw, 132px);
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(220px, 0.65fr) minmax(0, 1.35fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: end;
  margin-bottom: clamp(34px, 5vw, 56px);
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(2.2rem, 5vw, 4.5rem);
  line-height: 1.15;
}

.section-heading p {
  max-width: 720px;
  margin: 0;
  color: var(--muted);
  font-size: 1.08rem;
}

.panel {
  border: 1px solid var(--line);
  border-radius: var(--radius-large);
  background: var(--paper-soft);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.overview-panel {
  padding: clamp(28px, 5vw, 64px);
  font-size: clamp(1.2rem, 2.2vw, 1.65rem);
}

.overview-panel p {
  max-width: 880px;
  margin: 0;
}

.info-grid,
.route-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(18px, 2.4vw, 28px);
}

.info-card,
.route-card {
  padding: clamp(24px, 3vw, 32px);
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--paper-soft);
  box-shadow: var(--shadow-soft);
}

.info-card dt {
  color: var(--mountain-dark);
  font-weight: 900;
  letter-spacing: 0.12em;
}

.info-card dd {
  margin: 8px 0 0;
}

.route-card {
  min-height: 220px;
  display: flex;
  flex-direction: column;
  text-decoration: none;
  transition:
    transform 180ms ease,
    background 180ms ease;
}

.route-card:hover {
  background: #fffaf0;
  transform: translateY(-6px);
}

.route-number {
  color: var(--mountain-dark);
  font-weight: 900;
  letter-spacing: 0.14em;
}

.route-card h3 {
  margin: 14px 0 8px;
  font-size: 1.55rem;
  line-height: 1.3;
}

.route-card p {
  margin: 0;
  color: var(--muted);
}

.artwork-record {
  scroll-margin-top: 120px;
}

.route-card .arrow {
  margin-top: auto;
  padding-top: 24px;
  color: var(--mountain-dark);
  font-weight: 900;
}

/* 內頁標題、麵包屑與文章版型 */
.page-hero {
  padding-block: clamp(36px, 5vw, 64px) clamp(24px, 3vw, 40px);
}

.page-hero h1 {
  max-width: 900px;
  font-size: clamp(3rem, 6vw, 5.6rem);
}

.page-lead {
  max-width: 900px;
  margin: clamp(18px, 2.5vw, 26px) 0 0;
  font-size: clamp(1.1rem, 2vw, 1.35rem);
}

.artist-order-note {
  display: block;
  margin: 0.75rem 0 0;
  color: var(--mountain-dark);
  font-size: 0.78rem;
  font-weight: 700;
  line-height: 1.6;
  letter-spacing: 0.06em;
}

.breadcrumbs {
  margin-bottom: clamp(18px, 2.5vw, 28px);
  color: var(--muted);
  font-size: 0.92rem;
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.breadcrumbs li + li::before {
  margin-right: 8px;
  content: "/";
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(240px, 0.5fr);
  gap: clamp(24px, 3.5vw, 44px);
  align-items: start;
  padding-bottom: clamp(76px, 9vw, 112px);
}

.article-body {
  padding: clamp(28px, 5vw, 58px);
}

.article-body h2 {
  margin: 0 0 18px;
  font-size: clamp(1.9rem, 4vw, 3rem);
  line-height: 1.25;
}

.article-body h2:not(:first-child) {
  margin-top: 48px;
}

.article-body p,
.article-body li {
  font-size: 1.05rem;
}

.article-body a {
  color: var(--mountain-dark);
  font-weight: 800;
}

.side-note {
  position: sticky;
  top: 116px;
  padding: clamp(22px, 2.5vw, 30px);
}

.side-note h2 {
  margin: 0 0 10px;
  font-size: 1.15rem;
}

.side-note p {
  margin: 0;
  color: var(--muted);
}

.name-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.name-list li {
  padding: 18px;
  border-left: 5px solid var(--accent);
  background: var(--text-panel);
  backdrop-filter: blur(10px);
  font-weight: 900;
}

/* 捲動顯示動畫 */
.fade-in {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity 650ms ease,
    transform 650ms ease;
}

.fade-in.is-visible {
  opacity: 1;
  transform: none;
}

/* 響應式：窄桌面導覽密度與首頁一致 */
@media (max-width: 1100px) {
  .brand {
    font-size: 1.1rem;
  }

  .site-nav ul {
    gap: 16px;
  }

  .site-nav a {
    font-size: 0.9375rem;
  }
}

/* 響應式：窄桌面內容排列 */
@media (max-width: 1080px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .map-frame {
    max-width: 720px;
  }
}

/* 響應式：平板內容與收合導覽 */
@media (max-width: 900px) {
  :root {
    --header-gutter: 1.25rem;
  }

  .header-inner {
    padding-block: 0.875rem 1rem;
    gap: 20px;
  }

  .brand {
    font-size: clamp(0.95rem, 2.8vw, 1.05rem);
  }

  .menu-toggle {
    display: grid;
    place-items: center;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: var(--header-gutter);
    right: var(--header-gutter);
    display: none;
    padding: 12px;
    border: 1px solid rgba(55, 37, 15, 0.13);
    border-radius: 10px;
    background: rgba(247, 242, 223, 0.97);
    box-shadow: 0 18px 44px rgba(47, 110, 96, 0.2);
    backdrop-filter: blur(12px);
  }

  .site-nav.is-open {
    display: block;
  }

  .site-nav ul {
    width: 100%;
    margin: 0;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 4px;
  }

  .site-nav a {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 11px 12px;
    border-radius: 7px;
    white-space: normal;
  }

  .page-hero {
    padding-top: 40px;
  }

  .info-grid,
  .route-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .article-layout {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .side-note {
    position: static;
  }
}

/* 響應式：一般手機 */
@media (max-width: 760px) {
  :root {
    --page-gutter: 18px;
  }

  .header-inner {
    min-height: 70px;
    gap: 16px;
  }

  .brand {
    font-size: clamp(0.95rem, 2.8vw, 1.05rem);
  }

  .brand span {
    font-size: inherit;
  }

  .menu-toggle {
    width: 44px;
    height: 44px;
  }

  .hero {
    min-height: auto;
    gap: 28px;
    padding-block: 46px;
  }

  .hero h1,
  .page-hero h1 {
    font-size: clamp(2.35rem, 10.5vw, 3.35rem);
  }

  .map-frame img {
    height: min(70svh, 360px);
  }

  .section-heading,
  .article-layout {
    grid-template-columns: 1fr;
  }

  .info-grid,
  .route-grid,
  .name-list {
    grid-template-columns: 1fr;
  }

  .side-note {
    position: static;
  }

  .page-hero {
    padding-block: 24px 18px;
  }

  .breadcrumbs {
    margin-bottom: 12px;
  }

  .page-lead {
    margin-top: 12px;
    font-size: 1.03rem;
    line-height: 1.7;
  }

  .section {
    padding-block: 48px;
  }

  .section-heading {
    gap: 12px;
    margin-bottom: 26px;
  }

  .section-heading p {
    font-size: 1rem;
  }

  .article-layout {
    gap: 16px;
    padding-bottom: 52px;
  }

  .article-body {
    padding: clamp(20px, 5.5vw, 28px);
  }

  .article-body h2:not(:first-child) {
    margin-top: 32px;
  }

  .article-body p,
  .article-body li {
    font-size: 1rem;
  }

  .info-card,
  .route-card {
    padding: 20px;
  }
}

@media (max-width: 640px) {
  :root {
    --header-gutter: 1rem;
  }

  .header-inner {
    padding-block: 0.75rem 0.9rem;
  }

  .brand {
    font-size: clamp(0.9rem, 3.6vw, 0.95rem);
  }

  .site-nav {
    padding: 0.625rem;
  }

  .site-nav a {
    padding: 0.65rem 0.7rem;
    font-size: 0.875rem;
  }
}

/* 響應式：小型手機 */
@media (max-width: 520px) {
  :root {
    --page-gutter: 16px;
  }

  .info-grid,
  .route-grid {
    grid-template-columns: 1fr;
  }

  .button-row,
  .button {
    width: 100%;
  }

  .name-list li {
    padding: 15px;
  }

  .page-hero {
    padding-block: 20px 14px;
  }

  .article-layout {
    padding-bottom: 42px;
  }

  .article-body {
    padding: 18px;
  }
}

/* 無障礙：尊重使用者的減少動態效果偏好 */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .fade-in {
    opacity: 1;
    transform: none;
  }
}