/* ═══════════════════════════════════════════════════════════
   飛揚細籽 FEYOND — 共用樣式系統
   ═══════════════════════════════════════════════════════════ */

/* ─────────────────────────────────────────
   色彩系統 — 使用 data-theme 切換
   ───────────────────────────────────────── */

:root {
  /* 共用基底 */
  --cream: #FFFEF2;
  --bark: #4A4238;
  --bark-light: #6B6355;
  --ink: #2C2824;
  --ink-soft: #5C554D;
  
  /* 字體 */
  --font-display: 'Cormorant Garamond', Georgia, serif;
  --font-body: 'Noto Serif TC', Georgia, serif;
  
  /* 預設主題色（A 暖駝） */
  --theme-50: #F8F5EE;
  --theme-100: #E8E0D0;
  --theme-200: #C5B8A8;
  --theme-400: #8B7355;
  --theme-600: #5C4A3A;
  --theme-800: #3A2E28;
}

/* A. 暖駝 Taupe */
[data-theme="taupe"] {
  --theme-50: #F8F5EE;
  --theme-100: #E8E0D0;
  --theme-200: #C5B8A8;
  --theme-400: #8B7355;
  --theme-600: #5C4A3A;
  --theme-800: #3A2E28;
}

/* B. 赭陶 Terracotta */
[data-theme="terracotta"] {
  --theme-50: #FDF8F3;
  --theme-100: #F5E6D8;
  --theme-200: #E8C8B0;
  --theme-400: #C4978A;
  --theme-600: #A06B5C;
  --theme-800: #6B4A40;
}

/* C. 森綠 Forest */
[data-theme="forest"] {
  --theme-50: #F7FAF5;
  --theme-100: #E0EBE0;
  --theme-200: #B8D0B8;
  --theme-400: #6B9B6B;
  --theme-600: #3D6B4A;
  --theme-800: #2A4A35;
}

/* D. 靛藍 Indigo */
[data-theme="indigo"] {
  --theme-50: #F5F8FC;
  --theme-100: #E0E8F0;
  --theme-200: #B0C4D8;
  --theme-400: #6A8BA8;
  --theme-600: #3A5A78;
  --theme-800: #1A3A5C;
}

/* E. 紫藤 Wisteria */
[data-theme="wisteria"] {
  --theme-50: #FAF8FC;
  --theme-100: #EDE5F0;
  --theme-200: #D4C4E0;
  --theme-400: #A088B8;
  --theme-600: #6B5080;
  --theme-800: #4A3860;
}

/* F. 琥珀 Amber */
[data-theme="amber"] {
  --theme-50: #FFFCF5;
  --theme-100: #F8F0D8;
  --theme-200: #E8D8A8;
  --theme-400: #C9A227;
  --theme-600: #8B7020;
  --theme-800: #5C4A18;
}

/* G. 玫瑰 Rose */
[data-theme="rose"] {
  --theme-50: #FDF8F8;
  --theme-100: #F5E5E5;
  --theme-200: #E8C8C8;
  --theme-400: #C49090;
  --theme-600: #986868;
  --theme-800: #6B4545;
}

/* H. 青瓷 Celadon */
[data-theme="celadon"] {
  --theme-50: #F8FCFA;
  --theme-100: #E5F0EB;
  --theme-200: #C0D8D0;
  --theme-400: #7EB0A0;
  --theme-600: #4A8070;
  --theme-800: #2A5048;
}

/* J. 蒼白 Bone */
[data-theme="bone"] {
  --theme-50: #FDFCFA;
  --theme-100: #F0EDE8;
  --theme-200: #DDD8D0;
  --theme-400: #B8B0A5;
  --theme-600: #8A8278;
  --theme-800: #58524A;
}

/* K. 鼠尾 Sage */
[data-theme="sage"] {
  --theme-50: #F8FAF5;
  --theme-100: #E5EAE0;
  --theme-200: #C8D0C0;
  --theme-400: #9AA890;
  --theme-600: #6B7865;
  --theme-800: #454D42;
}

/* ─────────────────────────────────────────
   基礎重置
   ───────────────────────────────────────── */

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

html {
  scroll-behavior: smooth;
  background: var(--cream);
}

body {
  font-family: var(--font-body);
  font-weight: 300;
  line-height: 1.9;
  color: var(--ink);
  background: var(--cream);
  min-height: 100vh;
}

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

a {
  color: inherit;
  text-decoration: none;
}

/* ─────────────────────────────────────────
   導覽列
   ───────────────────────────────────────── */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--cream);
  border-bottom: 1px solid var(--theme-100);
  padding: 0 24px;
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 400;
  letter-spacing: 3px;
  color: var(--bark);
}

.nav-logo span {
  font-size: 12px;
  font-style: italic;
  letter-spacing: 1px;
  color: var(--bark-light);
  margin-left: 12px;
}

.nav-menu {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-menu a {
  font-family: var(--font-display);
  font-size: 14px;
  font-style: italic;
  letter-spacing: 1px;
  color: var(--bark-light);
  transition: color 0.2s;
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--ink);
}

/* 手機版選單 */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--bark);
  margin: 4px 0;
  transition: 0.2s;
}

@media (max-width: 768px) {
  .nav-toggle { display: block; }
  
  .nav-menu {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--cream);
    flex-direction: column;
    gap: 0;
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s;
    border-bottom: 1px solid var(--theme-100);
  }
  
  .nav-menu.open { max-height: 300px; }
  
  .nav-menu a {
    display: block;
    padding: 16px 24px;
    border-top: 1px solid var(--theme-100);
  }
}

/* ─────────────────────────────────────────
   頁首（首頁用）
   ───────────────────────────────────────── */

.site-header {
  text-align: center;
  padding: 80px 24px 60px;
  border-bottom: 1px solid var(--theme-100);
}

.site-title {
  font-family: var(--font-display);
  font-size: clamp(48px, 10vw, 80px);
  font-weight: 300;
  letter-spacing: 8px;
  color: var(--ink);
  margin-bottom: 16px;
}

.site-tagline {
  font-family: var(--font-display);
  font-size: 16px;
  font-style: italic;
  color: var(--bark-light);
  letter-spacing: 2px;
}

.site-intro {
  max-width: 600px;
  margin: 32px auto 0;
  font-size: 15px;
  line-height: 2;
  color: var(--ink-soft);
}

/* ─────────────────────────────────────────
   主題分類標籤
   ───────────────────────────────────────── */

.category-tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  padding: 32px 24px;
  flex-wrap: wrap;
}

.category-tab {
  font-family: var(--font-display);
  font-size: 13px;
  font-style: italic;
  letter-spacing: 2px;
  color: var(--bark-light);
  padding: 10px 20px;
  border: 1px solid var(--theme-200);
  background: transparent;
  cursor: pointer;
  transition: all 0.2s;
}

.category-tab:hover,
.category-tab.active {
  background: var(--theme-100);
  color: var(--ink);
  border-color: var(--theme-400);
}

/* ─────────────────────────────────────────
   文章卡片（首頁列表）
   ───────────────────────────────────────── */

.articles-grid {
  max-width: 1000px;
  margin: 0 auto;
  padding: 48px 24px 80px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 48px;
}

.article-card {
  display: block;
  transition: transform 0.3s;
}

.article-card:hover {
  transform: translateY(-4px);
}

.article-card-image {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  margin-bottom: 20px;
}

.article-card-category {
  font-family: var(--font-display);
  font-size: 11px;
  font-style: italic;
  letter-spacing: 2px;
  color: var(--theme-600);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.article-card-title {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 400;
  line-height: 1.4;
  color: var(--ink);
  margin-bottom: 12px;
}

.article-card-excerpt {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin-bottom: 16px;
}

.article-card-meta {
  font-family: var(--font-display);
  font-size: 12px;
  color: var(--bark-light);
  letter-spacing: 1px;
}

/* ─────────────────────────────────────────
   文章頁 Hero
   ───────────────────────────────────────── */

/* Hero A：純文字（極簡風） */
.hero-text {
  padding: 100px 24px 60px;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
  border-bottom: 1px solid var(--theme-100);
}

.hero-category {
  font-family: var(--font-display);
  font-size: 12px;
  font-style: italic;
  letter-spacing: 4px;
  color: var(--theme-600);
  margin-bottom: 32px;
  text-transform: uppercase;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(36px, 6vw, 60px);
  font-weight: 400;
  line-height: 1.15;
  color: var(--ink);
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-family: var(--font-display);
  font-size: clamp(18px, 2.5vw, 22px);
  font-style: italic;
  font-weight: 400;
  color: var(--ink-soft);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
}

/* Hero B：全幅圖片 + 標題疊加 */
.hero-image {
  position: relative;
  width: 100%;
  height: 70vh;
  min-height: 500px;
  max-height: 700px;
  overflow: hidden;
}

.hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.75);
}

.hero-image-content {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 80px 24px 60px;
  background: linear-gradient(to top, rgba(0,0,0,0.6) 0%, transparent 100%);
  text-align: center;
}

.hero-image-content .hero-category {
  color: rgba(255,255,255,0.75);
}

.hero-image-content .hero-title {
  color: #fff;
  max-width: 800px;
  margin: 0 auto 16px;
}

.hero-image-content .hero-subtitle {
  color: rgba(255,255,255,0.85);
}

/* ─────────────────────────────────────────
   文章 Meta
   ───────────────────────────────────────── */

.meta-bar {
  text-align: center;
  padding: 28px 24px;
  border-bottom: 1px solid var(--theme-100);
}

.meta-bar span {
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: 2px;
  color: var(--bark-light);
}

.meta-bar .divider {
  margin: 0 16px;
  color: var(--theme-200);
}

/* ─────────────────────────────────────────
   文章內容
   ───────────────────────────────────────── */

.article-content {
  max-width: 620px;
  margin: 0 auto;
  padding: 56px 24px;
}

.article-content p {
  font-size: 17px;
  font-weight: 300;
  line-height: 2;
  color: var(--ink-soft);
  margin-bottom: 28px;
  text-align: justify;
}

.article-content p strong {
  font-weight: 400;
  color: var(--ink);
}

.article-content p em {
  font-style: italic;
}

/* 首字放大 */
.article-content p.drop-cap::first-letter {
  font-family: var(--font-display);
  font-size: 72px;
  float: left;
  line-height: 0.8;
  padding-right: 12px;
  padding-top: 4px;
  color: var(--theme-600);
}

/* 清單 */
.article-content ul {
  margin: 32px 0;
  padding-left: 0;
  list-style: none;
}

.article-content ul li {
  font-size: 17px;
  font-weight: 300;
  line-height: 1.9;
  color: var(--ink-soft);
  margin-bottom: 20px;
  padding-left: 24px;
  position: relative;
}

.article-content ul li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--theme-400);
}

/* ─────────────────────────────────────────
   引言區塊
   ───────────────────────────────────────── */

.quote-light {
  background: var(--theme-100);
  margin: 64px calc(-50vw + 50%);
  padding: 80px 24px;
  text-align: center;
}

.quote-light blockquote {
  font-family: var(--font-display);
  font-size: clamp(20px, 3.5vw, 28px);
  font-style: italic;
  font-weight: 400;
  line-height: 1.65;
  color: var(--ink);
  max-width: 700px;
  margin: 0 auto;
}

.quote-light cite {
  display: block;
  font-family: var(--font-display);
  font-size: 13px;
  font-style: normal;
  letter-spacing: 2px;
  color: var(--theme-600);
  margin-top: 28px;
}

.quote-dark {
  background: var(--theme-800);
  margin: 64px calc(-50vw + 50%);
  padding: 100px 24px;
  text-align: center;
}

.quote-dark blockquote {
  font-family: var(--font-display);
  font-size: clamp(22px, 4vw, 32px);
  font-style: italic;
  font-weight: 400;
  line-height: 1.55;
  color: #fff;
  max-width: 720px;
  margin: 0 auto;
}

.quote-dark cite {
  display: block;
  font-family: var(--font-display);
  font-size: 13px;
  font-style: normal;
  letter-spacing: 2px;
  color: rgba(255,255,255,0.6);
  margin-top: 32px;
}

/* ─────────────────────────────────────────
   章節標記
   ───────────────────────────────────────── */

.section-marker {
  text-align: center;
  margin: 72px 0 48px;
}

.section-marker span {
  font-family: var(--font-display);
  font-size: 13px;
  font-style: italic;
  letter-spacing: 4px;
  color: var(--theme-600);
  display: inline-block;
  padding: 0 24px;
  position: relative;
}

.section-marker span::before,
.section-marker span::after {
  content: '';
  position: absolute;
  top: 50%;
  width: 40px;
  height: 1px;
  background: var(--theme-200);
}

.section-marker span::before { right: 100%; }
.section-marker span::after { left: 100%; }

.section-break {
  text-align: center;
  margin: 72px 0;
}

.section-break span {
  display: inline-block;
  width: 60px;
  height: 1px;
  background: var(--theme-200);
}

/* ─────────────────────────────────────────
   圖片
   ───────────────────────────────────────── */

.inline-image {
  margin: 56px 0;
}

.inline-image img {
  width: 100%;
  height: auto;
}

.inline-image figcaption,
.full-image figcaption {
  font-family: var(--font-display);
  font-size: 12px;
  font-style: italic;
  color: var(--bark-light);
  text-align: center;
  margin-top: 16px;
}

.full-image {
  margin: 72px calc(-50vw + 50%);
  width: 100vw;
}

.full-image img {
  width: 100%;
  height: 50vh;
  min-height: 320px;
  max-height: 500px;
  object-fit: cover;
}

.image-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
  margin: 72px calc(-50vw + 50%);
  width: 100vw;
}

.image-pair img {
  width: 100%;
  height: 45vh;
  min-height: 280px;
  object-fit: cover;
}

/* ─────────────────────────────────────────
   植物資訊卡
   ───────────────────────────────────────── */

.plant-info {
  background: var(--theme-100);
  margin: 64px calc(-50vw + 50%);
  padding: 64px 24px;
}

.plant-info-inner {
  max-width: 620px;
  margin: 0 auto;
}

.plant-info h3 {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 400;
  color: var(--ink);
  text-align: center;
  margin-bottom: 40px;
}

.plant-info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px 48px;
}

.plant-info-item {
  text-align: center;
}

.plant-info-item dt {
  font-family: var(--font-display);
  font-size: 12px;
  font-style: italic;
  letter-spacing: 2px;
  color: var(--theme-600);
  margin-bottom: 8px;
}

.plant-info-item dd {
  font-size: 15px;
  font-weight: 300;
  color: var(--ink);
  line-height: 1.6;
}

.plant-info-full {
  grid-column: 1 / -1;
  text-align: left;
}

.plant-info-full dt {
  text-align: center;
}

/* ─────────────────────────────────────────
   儀式區塊
   ───────────────────────────────────────── */

.ritual-section {
  background: var(--theme-100);
  margin: 64px calc(-50vw + 50%);
  padding: 80px 24px;
}

.ritual-inner {
  max-width: 620px;
  margin: 0 auto;
}

.ritual-title {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 400;
  color: var(--ink);
  text-align: center;
  margin-bottom: 48px;
}

.ritual-card {
  background: var(--cream);
  padding: 40px;
  margin-bottom: 32px;
  border-left: 3px solid var(--theme-400);
}

.ritual-card:last-child {
  margin-bottom: 0;
}

.ritual-card h4 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 20px;
}

.ritual-card .recipe {
  font-family: var(--font-display);
  font-size: 15px;
  font-style: italic;
  color: var(--theme-600);
  padding: 16px 20px;
  background: var(--theme-50);
  margin-bottom: 20px;
}

.ritual-card p {
  font-size: 16px;
  font-weight: 300;
  line-height: 1.9;
  color: var(--ink-soft);
  margin-bottom: 20px;
}

.ritual-card blockquote {
  font-family: var(--font-display);
  font-size: 17px;
  font-style: italic;
  line-height: 1.8;
  color: var(--ink);
  padding: 24px;
  background: var(--theme-50);
  border-left: 2px solid var(--theme-600);
  margin: 0;
}

/* ─────────────────────────────────────────
   結尾區塊
   ───────────────────────────────────────── */

.closing {
  background: var(--theme-100);
  margin: 80px calc(-50vw + 50%) 0;
  padding: 100px 24px;
  text-align: center;
}

.closing-icon {
  font-size: 32px;
  margin-bottom: 24px;
  color: var(--theme-400);
}

.closing-text {
  font-family: var(--font-display);
  font-size: clamp(20px, 4vw, 28px);
  font-style: italic;
  font-weight: 400;
  line-height: 1.6;
  color: var(--ink);
  max-width: 600px;
  margin: 0 auto;
}

/* ─────────────────────────────────────────
   文章導覽（上一篇/下一篇）
   ───────────────────────────────────────── */

.article-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  max-width: 800px;
  margin: 0 auto;
  padding: 48px 24px;
  border-top: 1px solid var(--theme-100);
}

.article-nav-item {
  padding: 24px;
  border: 1px solid var(--theme-200);
  transition: all 0.2s;
}

.article-nav-item:hover {
  background: var(--theme-50);
  border-color: var(--theme-400);
}

.article-nav-item.next {
  text-align: right;
}

.article-nav-label {
  font-family: var(--font-display);
  font-size: 12px;
  font-style: italic;
  letter-spacing: 2px;
  color: var(--theme-600);
  margin-bottom: 8px;
}

.article-nav-title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 400;
  color: var(--ink);
  line-height: 1.4;
}

/* ─────────────────────────────────────────
   標籤
   ───────────────────────────────────────── */

.tags {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 40px 24px;
  border-top: 1px solid var(--theme-100);
}

.tags a {
  font-family: var(--font-display);
  font-size: 12px;
  font-style: italic;
  letter-spacing: 1px;
  color: var(--theme-600);
  padding: 6px 14px;
  border: 1px solid var(--theme-200);
  transition: all 0.2s;
}

.tags a:hover {
  background: var(--theme-100);
  color: var(--theme-800);
}

/* ─────────────────────────────────────────
   頁尾
   ───────────────────────────────────────── */

.site-footer {
  padding: 64px 24px;
  text-align: center;
  border-top: 1px solid var(--theme-100);
  background: var(--cream);
}

.footer-brand {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 400;
  letter-spacing: 4px;
  color: var(--bark);
  margin-bottom: 16px;
}

.footer-tagline {
  font-family: var(--font-display);
  font-size: 14px;
  font-style: italic;
  color: var(--bark-light);
  margin-bottom: 32px;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-bottom: 32px;
}

.footer-links a {
  font-family: var(--font-display);
  font-size: 13px;
  color: var(--bark-light);
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--ink);
}

.footer-copy {
  font-size: 12px;
  color: var(--theme-400);
}

/* ─────────────────────────────────────────
   動畫
   ───────────────────────────────────────── */

.fade-in {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ─────────────────────────────────────────
   響應式
   ───────────────────────────────────────── */

@media (max-width: 768px) {
  .hero-text { padding: 60px 24px 40px; }
  .hero-image { height: 60vh; min-height: 400px; }
  
  .quote-light, .quote-dark, .plant-info, .ritual-section,
  .closing, .full-image, .image-pair {
    margin-left: -24px;
    margin-right: -24px;
    width: calc(100% + 48px);
  }
  
  .plant-info-grid { grid-template-columns: 1fr; }
  .image-pair { grid-template-columns: 1fr; gap: 0; }
  .image-pair img { height: 35vh; }
  
  .article-nav { grid-template-columns: 1fr; }
  .article-nav-item.next { text-align: left; }
  
  .ritual-card { padding: 28px 20px; }
  
  .article-content p.drop-cap::first-letter { font-size: 56px; }
  
  .footer-links { flex-direction: column; gap: 16px; }
}

/* ─────────────────────────────────────────
   返回頂端
   ───────────────────────────────────────── */

.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  background: var(--cream);
  border: 1px solid var(--theme-200);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s;
  z-index: 99;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--theme-100);
  border-color: var(--theme-400);
}

.back-to-top::before {
  content: '↑';
  font-family: var(--font-display);
  font-size: 18px;
  color: var(--bark);
}