/* ============================================================
   Ray's English Corner — 全站共用樣式
   ------------------------------------------------------------
   維護重點：改主色 → 只改下面 :root 的變數，全站同步。
   各頁專屬樣式（NBA 計分板、分詞構句步驟卡等）留在各頁 <style>。
   ============================================================ */

/* ---------- 色票（全站唯一來源）---------- */
:root {
  --cream:    #faf8f2;
  --cream-d:  #ede8d8;
  --green-dk: #1e4d30;
  --green-md: #3a7a50;
  --green-lt: #6db88a;
  --green-pl: #e2f2e8;
  --amber:    #f5a623;
  --amber-pl: #fff8ec;
  --warm:     #e07850;
  --warm-pl:  #fdf0ea;
  --sky:      #4a9ebb;
  --sky-pl:   #eaf4f9;
  --text:     #1a2a1a;
  --text-md:  #466046;
  --text-lt:  #7a9a7a;
  --border:   #d5cbb5;
  --white:    #ffffff;
  --ink:      #1a2318;
  --muted:    #5a6b5e;
  --sh:       0 4px 20px rgba(30,77,48,0.10);
  --sh-lg:    0 12px 48px rgba(30,77,48,0.15);
  --r:        14px;

  /* 相容別名：分詞構句頁原本用的變數名，指到統一色值 */
  --green-dark:  #1e4d30;
  --green-mid:   #3a7a50;
  --green-light: #6db88a;
  --green-pale:  #e2f2e8;
  --cream-dark:  #ede8d8;
  --amber-light: #f5a623;
}

/* ---------- 基礎 ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Nunito', 'Noto Sans TC', sans-serif;
  background: var(--cream);
  color: var(--text);
  line-height: 1.75;
  overflow-x: hidden;
}
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: var(--cream-d); }
::-webkit-scrollbar-thumb { background: var(--green-lt); border-radius: 99px; }

/* ---------- 導覽列（由 main.js 注入）---------- */
nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(250,248,242,0.94); backdrop-filter: blur(14px);
  border-bottom: 1.5px solid var(--border);
  padding: 0 5%; height: 58px;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-logo {
  font-family: 'Playfair Display', serif; font-size: 1.15rem; font-weight: 900;
  color: var(--green-dk); text-decoration: none; letter-spacing: 0.01em;
  display: flex; align-items: center; gap: 8px;
}
.nav-logo .dot { color: var(--warm); }
.nav-links { display: flex; gap: 1.4rem; list-style: none; align-items: center; }
.nav-links a {
  text-decoration: none; color: var(--text-md);
  font-size: 0.86rem; font-weight: 800; letter-spacing: 0.04em;
  transition: color .18s; position: relative;
}
.nav-links a::after {
  content: ''; position: absolute; bottom: -3px; left: 0; right: 0;
  height: 2px; background: var(--amber); border-radius: 99px;
  transform: scaleX(0); transition: transform .2s;
}
.nav-links a:hover { color: var(--green-dk); }
.nav-links a:hover::after { transform: scaleX(1); }
.nav-links a.active { color: var(--green-dk); }
.nav-links a.active::after { transform: scaleX(1); }

/* dropdown */
.dropdown { position: relative; }
.dropdown > a::after { display: none; }   /* 下拉父項不要底線動畫 */
.dropdown-content {
  display: none; position: absolute; top: 100%; left: 0;
  background: var(--white); border: 1px solid var(--border);
  border-radius: 8px; box-shadow: var(--sh); min-width: 170px; z-index: 10;
  overflow: hidden;
}
.dropdown-content a {
  display: block; padding: 10px 16px; font-size: 0.88rem; font-weight: 700;
}
.dropdown-content a::after { display: none; }
.dropdown-content a:hover { background: var(--cream); color: var(--green-dk); }
.dropdown:hover .dropdown-content { display: block; }

/* ---------- 頁尾（由 main.js 注入）---------- */
footer {
  background: var(--green-dk); color: rgba(255,255,255,0.65);
  text-align: center; padding: 36px 5%; font-size: 0.86rem; line-height: 1.9;
}
.f-logo {
  font-family: 'Playfair Display', serif; font-size: 1.25rem; font-weight: 900;
  color: #fff; margin-bottom: 6px;
}
.f-logo span { color: var(--amber); }

/* ---------- 共用：捲動淡入 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .58s ease, transform .58s ease; }
.reveal.visible { opacity: 1; transform: none; }
.sr { opacity: 0; transform: translateY(20px); transition: opacity .5s ease, transform .5s ease; }
.sr.vis { opacity: 1; transform: translateY(0); }
.d1 { transition-delay: .1s; } .d2 { transition-delay: .2s; } .d3 { transition-delay: .3s; }

/* ---------- 共用：通用 hero（內頁綠底）---------- */
.hero {
  background: var(--green-dk); padding: 60px 5% 68px;
  text-align: center; position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background-image: radial-gradient(circle, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 24px 24px; pointer-events: none;
}
.hero-badge {
  display: inline-block; background: var(--amber); color: #fff;
  font-size: 0.72rem; font-weight: 900; letter-spacing: 0.12em;
  text-transform: uppercase; padding: 4px 14px; border-radius: 999px; margin-bottom: 14px;
}
.hero h1 {
  font-family: 'Playfair Display', serif;
  font-size: clamp(1.8rem, 4vw, 2.9rem); font-weight: 900;
  color: #fff; margin-bottom: 10px; line-height: 1.2; position: relative;
}
.hero h1 em { color: var(--amber); font-style: normal; }
.hero p { color: rgba(255,255,255,0.68); max-width: 520px; margin: 0 auto 22px; font-size: 0.98rem; position: relative; }
.hero-sub { font-size: 1rem; opacity: .82; max-width: 520px; margin: 0 auto 28px; position: relative; }
.hero-chips { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; position: relative; }
.hero-chips .chip {
  background: rgba(255,255,255,0.13); border: 1px solid rgba(255,255,255,0.22);
  color: #fff; font-size: 0.78rem; font-weight: 700; padding: 5px 14px; border-radius: 999px;
}

/* ---------- 共用：section 標題系統 ---------- */
.section-tag { font-size: 0.74rem; font-weight: 900; letter-spacing: 0.15em; text-transform: uppercase; color: var(--warm); margin-bottom: 8px; }
.section-title { font-family: 'Playfair Display', serif; font-size: clamp(1.7rem, 4vw, 2.5rem); font-weight: 700; color: var(--green-dk); line-height: 1.25; margin-bottom: 14px; }
.section-desc { color: var(--text-md); max-width: 560px; font-size: 0.98rem; line-height: 1.8; }
.section-head { margin-bottom: 48px; }
.inner { max-width: 1100px; margin: 0 auto; }

/* ---------- 共用：sec-label（課程頁區塊標題）---------- */
.sec-label { display: flex; align-items: center; gap: 12px; margin: 48px 0 20px; }
.sec-label .sl-icon { width: 40px; height: 40px; border-radius: 11px; background: var(--green-dk); color: #fff; font-size: 1.1rem; display: grid; place-items: center; flex-shrink: 0; }
.sec-label h2 { font-family: 'Playfair Display', serif; font-size: 1.3rem; color: var(--green-dk); }
.sec-label h2 small { display: block; font-family: 'Nunito', sans-serif; font-size: 0.72rem; font-weight: 900; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-lt); }

/* ---------- 共用：返回鈕 ---------- */
.back-btn { display: inline-flex; margin-bottom: 28px; text-decoration: none; color: var(--green-md); font-weight: 800; font-size: 0.95rem; transition: color .2s; }
.back-btn:hover { color: var(--green-dk); }

/* ---------- 共用：老師白話框 ---------- */
.teacher-talk { background: var(--amber-pl); border: 1.5px dashed var(--amber); border-radius: 12px; padding: 16px 20px; margin-bottom: 24px; font-size: 0.95rem; color: var(--text-md); font-family: 'Noto Sans TC', sans-serif; line-height: 1.75; }
.teacher-talk b { color: var(--green-dk); font-family: 'Nunito', sans-serif; }

/* ---------- 共用：grammar 展開卡 ---------- */
.g-card { background: var(--white); border-radius: var(--r); box-shadow: var(--sh); margin-bottom: 20px; overflow: hidden; border: 2px solid transparent; transition: border-color .25s, box-shadow .25s; }
.g-card:hover { border-color: var(--green-lt); box-shadow: var(--sh-lg); }
.g-card-head { padding: 18px 24px; background: var(--green-dk); color: #fff; display: flex; align-items: center; gap: 12px; cursor: pointer; user-select: none; }
.g-card-head .gh-num, .gh-num { width: 28px; height: 28px; border-radius: 50%; background: rgba(255,255,255,0.18); font-weight: 900; font-size: 0.85rem; display: grid; place-items: center; flex-shrink: 0; }
.g-card-head .gh-title, .gh-title { font-family: 'Playfair Display', serif; font-size: 1.05rem; font-weight: 700; flex: 1; }
.g-card-head .gh-sub, .gh-sub { font-size: 0.78rem; opacity: 0.7; margin-top: 2px; }
.g-card-head .gh-arrow, .gh-arrow { font-size: 0.9rem; transition: transform .25s; }
.g-card.open .gh-arrow { transform: rotate(180deg); }
.g-card-body { display: none; padding: 22px 26px; }
.g-card.open .g-card-body { display: block; }

/* ---------- 共用：例句/規則/警告框 ---------- */
.ex-box { background: var(--green-pl); border-left: 4px solid var(--green-md); border-radius: 8px; padding: 10px 14px; font-size: 0.9rem; margin: 6px 0; line-height: 1.7; }
.ex-box .en { font-weight: 700; color: var(--green-dk); }
.ex-box .zh { font-family: 'Noto Sans TC', sans-serif; font-size: 0.83rem; color: var(--text-md); margin-top: 2px; }
.warn-box { background: var(--warm-pl); border-left: 4px solid var(--warm); border-radius: 8px; padding: 10px 14px; font-size: 0.88rem; font-family: 'Noto Sans TC', sans-serif; line-height: 1.7; margin: 8px 0; color: var(--text); }
.warn-box strong { font-family: 'Nunito', sans-serif; color: var(--warm); }

/* ---------- 漢堡按鈕 ---------- */
.nav-burger {
  display: none;
  background: none; border: none;
  font-size: 1.55rem; cursor: pointer;
  color: var(--green-dk);
  padding: 6px 8px; border-radius: 8px;
  line-height: 1;
  transition: background .18s;
}
.nav-burger:hover { background: var(--cream-d); }

/* ---------- 手機選單（滑出面板）---------- */
.mobile-menu {
  display: none;
  position: fixed; top: 58px; left: 0; right: 0; bottom: 0;
  background: var(--white);
  z-index: 98;
  overflow-y: auto;
  padding: 8px 6% 60px;
  border-top: 1.5px solid var(--border);
  box-shadow: 0 8px 32px rgba(30,77,48,0.12);
}
.mobile-menu.open { display: block; }

.mobile-links { list-style: none; }
.mobile-links > li > a {
  display: block; padding: 15px 0;
  border-bottom: 1px solid var(--cream-d);
  font-size: 1.05rem; font-weight: 800;
  color: var(--green-dk); text-decoration: none;
  transition: color .15s;
}
.mobile-links > li > a:hover { color: var(--warm); }
.mobile-links .m-group {
  font-size: 0.72rem; font-weight: 900;
  letter-spacing: 0.15em; text-transform: uppercase;
  color: var(--warm); padding: 22px 0 6px;
}
.mobile-links .m-sub a {
  padding: 11px 0 11px 18px;
  font-size: 0.93rem; font-weight: 700;
  color: var(--text-md);
}

/* ---------- 響應式 ---------- */
@media (max-width: 960px) {
  .nav-links { display: none; }
  .nav-burger { display: flex; align-items: center; justify-content: center; }
}