/* ==========================================================================
   DSE 中文科範文自學平台 — 全站樣式
   色調說明：米白／淡灰底 + 深藍／墨綠主題字，刻意壓低飽和度，
   目標是長時間閱讀不刺眼。所有顏色與間距集中寫在 :root 變數，
   之後要微調配色只需要改這裡。
   ========================================================================== */

:root {
  /* ---- 色彩 ---- */
  --color-bg: #f6f4ee;           /* 頁面底色：米白 */
  --color-bg-alt: #eef0e8;       /* 區塊交錯用的淡灰綠 */
  --color-surface: #ffffff;      /* 卡片、輸入框等前景色 */
  --color-border: #ddd6c4;       /* 米白系邊框 */
  --color-border-soft: #e7e2d3;

  --color-ink: #23322b;          /* 主要文字：深墨綠黑 */
  --color-ink-soft: #5c6b5f;     /* 次要文字 */
  --color-ink-faint: #8b988e;    /* 輔助文字（如日期、篇章編號） */

  --color-primary: #1f3a5f;      /* 深藍：主要按鈕、連結 */
  --color-primary-dark: #16283f;
  --color-primary-soft: #e7edf3; /* 淡藍底，用於標籤、hover 背景 */

  --color-jade: #2f4a3c;         /* 墨綠：次要強調色 */

  /* 四大文體各自的識別色，全部維持低飽和度 */
  --color-narrative: #1f3a5f;
  --color-argumentative: #2f4a3c;
  --color-descriptive: #6b5a3f;
  --color-topic: #5c4a66;

  /* ---- 排版 ---- */
  --font-serif: "Noto Serif TC", "PMingLiU", serif;
  --font-sans: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;

  /* ---- 版面 ---- */
  --container-width: 1120px;
  --header-height: 72px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-card: 0 1px 2px rgba(35, 50, 43, 0.06), 0 6px 16px rgba(35, 50, 43, 0.05);
}

/* ---- 基礎重置 ---- */
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-sans);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--font-serif);
  color: var(--color-ink);
  margin: 0;
  line-height: 1.4;
}

p {
  margin: 0;
}

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

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

button {
  font-family: inherit;
  cursor: pointer;
}

/* 鍵盤操作時顯示明確的 focus 樣式，滑鼠點擊時不顯示，兼顧美觀與可及性 */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   頂部導航列
   ========================================================================== */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(246, 244, 238, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
}

.nav-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.logo {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  flex-shrink: 0;
}

.logo-mark {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color-primary);
}

.logo-sub {
  font-size: 0.7rem;
  color: var(--color-ink-faint);
  margin-top: 2px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 32px;
  flex: 1;
  justify-content: flex-end;
}

.nav-links {
  display: flex;
  gap: 28px;
}

.nav-links a {
  font-size: 0.95rem;
  color: var(--color-ink-soft);
  padding: 6px 2px;
  border-bottom: 2px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
  white-space: nowrap;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.nav-search {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 8px 14px;
  width: 220px;
  flex-shrink: 0;
}

.nav-search .search-icon {
  width: 16px;
  height: 16px;
  color: var(--color-ink-faint);
  flex-shrink: 0;
}

.nav-search input {
  border: none;
  outline: none;
  background: transparent;
  font-family: inherit;
  font-size: 0.85rem;
  color: var(--color-ink);
  width: 100%;
}

.nav-search input::placeholder {
  color: var(--color-ink-faint);
}

/* 手機版選單開關按鈕，桌面版隱藏 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  padding: 0;
  flex-shrink: 0;
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--color-ink);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* 開啟選單時，把三條線變成一個 X */
.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ==========================================================================
   主視覺（Hero）
   ========================================================================== */

.hero {
  padding: calc(var(--header-height) + 64px) 0 72px;
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-alt) 100%);
  border-bottom: 1px solid var(--color-border-soft);
  overflow: hidden;
}

.hero-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}

.hero-content {
  max-width: 620px;
}

.hero-kicker {
  font-size: 0.85rem;
  color: var(--color-ink-soft);
  margin-bottom: 16px;
}

.hero h1 {
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  margin-bottom: 20px;
}

.hero-desc {
  font-size: 1rem;
  color: var(--color-ink-soft);
  max-width: 52ch;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

/* 裝飾用直排文字：呼應中文直書傳統，作為主視覺唯一的「亮點」，其餘元素保持低調 */
.hero-motif {
  writing-mode: vertical-rl;
  font-family: var(--font-serif);
  font-size: 1.6rem;
  letter-spacing: 0.3em;
  color: var(--color-primary);
  opacity: 0.14;
  flex-shrink: 0;
  user-select: none;
}

/* ==========================================================================
   按鈕
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 26px;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 500;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--color-primary-dark);
}

.btn-ghost {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  background: var(--color-primary-soft);
}

/* ==========================================================================
   通用區塊樣式
   ========================================================================== */

.section {
  padding: 64px 0;
}

.section-alt {
  background: var(--color-bg-alt);
}

.section-head {
  max-width: 60ch;
  margin-bottom: 32px;
}

.section-head h2 {
  font-size: 1.6rem;
  margin-bottom: 10px;
}

.section-desc {
  color: var(--color-ink-soft);
  font-size: 0.95rem;
}

.status-text {
  color: var(--color-ink-faint);
  font-size: 0.9rem;
  padding: 24px 0;
}

/* ==========================================================================
   寫作地圖：四大文體卡片
   ========================================================================== */

.genre-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.genre-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  overflow: hidden;
  min-height: 190px;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.genre-card:hover,
.genre-card:focus-visible {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
  border-color: var(--color-border-soft);
}

/* 每張卡片右上角的大字，作為該文體的視覺標記，取代千篇一律的 icon */
.genre-glyph {
  position: absolute;
  top: -18px;
  right: -6px;
  font-family: var(--font-serif);
  font-size: 6.5rem;
  font-weight: 700;
  line-height: 1;
  opacity: 0.08;
  pointer-events: none;
}

.genre-card h3 {
  font-size: 1.15rem;
  position: relative;
  z-index: 1;
}

.genre-card p {
  font-size: 0.88rem;
  color: var(--color-ink-soft);
  position: relative;
  z-index: 1;
  flex: 1;
}

.genre-count {
  font-size: 0.8rem;
  color: var(--color-ink-faint);
  position: relative;
  z-index: 1;
  margin-top: 4px;
}

/* 四個文體各自的識別色，套在字元與卡片上邊框 */
.genre-narrative { border-top: 3px solid var(--color-narrative); }
.genre-narrative .genre-glyph { color: var(--color-narrative); }

.genre-argumentative { border-top: 3px solid var(--color-argumentative); }
.genre-argumentative .genre-glyph { color: var(--color-argumentative); }

.genre-descriptive { border-top: 3px solid var(--color-descriptive); }
.genre-descriptive .genre-glyph { color: var(--color-descriptive); }

.genre-topic { border-top: 3px solid var(--color-topic); }
.genre-topic .genre-glyph { color: var(--color-topic); }

/* ==========================================================================
   熱門範文卡片（由 main.js 動態產生）
   ========================================================================== */

.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.article-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 22px;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.article-card:hover,
.article-card:focus-visible {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}

.article-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.article-id {
  font-family: var(--font-serif);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-primary);
}

.article-genre-tag {
  font-size: 0.72rem;
  color: var(--color-ink-soft);
  background: var(--color-bg-alt);
  padding: 3px 10px;
  border-radius: 999px;
}

.article-meta {
  font-size: 0.8rem;
  color: var(--color-ink-faint);
}

.article-question {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-ink);
  /* 題目文字可能較長，最多顯示 3 行，超出的部分用「…」省略 */
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
  padding-top: 4px;
}

.tag {
  font-size: 0.75rem;
  color: var(--color-jade);
  background: var(--color-primary-soft);
  padding: 3px 10px;
  border-radius: 999px;
}

/* ==========================================================================
   頁尾
   ========================================================================== */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 24px 0;
}

.footer-inner {
  font-size: 0.82rem;
  color: var(--color-ink-faint);
  text-align: center;
}

/* ==========================================================================
   響應式：平板（≤ 960px）
   ========================================================================== */

@media (max-width: 960px) {
  .genre-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-motif {
    font-size: 1.3rem;
  }

  .hero h1 {
    font-size: 2rem;
  }
}

/* ==========================================================================
   響應式：手機（≤ 720px）
   ========================================================================== */

@media (max-width: 720px) {

  .container {
    padding: 0 18px;
  }

  /* --- 導航列改為漢堡選單 --- */
  .nav-toggle {
    display: flex;
  }

  .main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 20px 20px;
    justify-content: flex-start;
    /* 預設收起：往上位移並隱藏，避免遮住畫面或誤觸 */
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s;
  }

  .main-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .nav-links {
    flex-direction: column;
    gap: 4px;
    margin-bottom: 14px;
  }

  .nav-links a {
    padding: 10px 4px;
    border-bottom: 1px solid var(--color-border-soft);
  }

  .nav-search {
    width: 100%;
  }

  /* --- 主視覺改為單欄，隱藏裝飾直排文字 --- */
  .hero {
    padding: calc(var(--header-height) + 40px) 0 48px;
  }

  .hero-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero-motif {
    display: none;
  }

  .hero h1 {
    font-size: 1.7rem;
  }

  .hero-actions {
    width: 100%;
  }

  .hero-actions .btn {
    flex: 1;
  }

  /* --- 卡片改為單欄 --- */
  .genre-grid {
    grid-template-columns: 1fr;
  }

  .genre-glyph {
    font-size: 5rem;
  }

  .article-grid {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 48px 0;
  }
}