/* style.css - Kevin 老師前台樣式 (深色質感版) */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+TC:wght@400;700;900&display=swap');

:root {
  --primary: #ff6b3d;
  --primary-dark: #e2572c;
  --bg: #0f172a;
  --bg-light: #111827;
  --card: #020617;
  --accent: #38bdf8;
  --text-main: #e5e7eb;
  --text-muted: #9ca3af;
  --border-soft: #1f2937;
  --radius-lg: 18px;
  --radius-xl: 26px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, sans-serif;
  background: radial-gradient(circle at top, #1f2937 0, #020617 55%, #000 100%);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; transition: 0.3s; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

.page { min-height: 100vh; }
.container { width: 100%; max-width: 1100px; margin: 0 auto; padding: 0 20px; }

/* ===== Header / Nav ===== */
header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(18px);
  background: linear-gradient(to bottom, rgba(15, 23, 42, 0.95), rgba(15, 23, 42, 0.7), transparent);
  border-bottom: 1px solid rgba(55, 65, 81, 0.6);
}

.nav { display: flex; align-items: center; justify-content: space-between; padding: 12px 0; }
.nav-left { display: flex; align-items: center; gap: 10px; }

/* Logo 修改：無底色，紅字 */
.logo-circle {
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  font-weight: 900; font-size: 32px; /* 字體加大 */
  color: #ef4444; /* 紅色 */
  background: transparent; /* 無底色 */
  text-shadow: 0 2px 15px rgba(239, 68, 68, 0.4); /* 微微發光 */
}

.logo-text { display: flex; flex-direction: column; line-height: 1.2; }
.logo-text span:first-child { font-size: 15px; font-weight: 700; letter-spacing: 0.05em; color: #fff; }
.logo-text span:last-child { font-size: 12px; color: var(--text-muted); }

.nav-links { display: flex; gap: 10px; font-size: 14px; }
.nav-links a { padding: 6px 12px; border-radius: 20px; color: var(--text-muted); }
.nav-links a:hover { color: #fff; background: rgba(255,255,255,0.05); }

.nav-cta-btn {
  padding: 8px 18px; border-radius: 999px; border: none; cursor: pointer;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white; font-size: 14px; font-weight: 700;
  box-shadow: 0 8px 20px rgba(248, 113, 22, 0.4);
  transition: 0.2s;
}
.nav-cta-btn:hover { transform: translateY(-1px); filter: brightness(1.1); }
.menu-toggle { display: none; font-size: 24px; color: #fff; cursor: pointer; }

/* ===== Hero ===== */
.hero { padding: 60px 0 80px; }
.hero-grid { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 40px; align-items: center; }

.badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 5px 12px; border-radius: 999px;
  background: rgba(15, 118, 110, 0.15); border: 1px solid rgba(45, 212, 191, 0.3);
  color: #a5f3fc; font-size: 13px; margin-bottom: 15px;
}
.badge-dot { width: 8px; height: 8px; border-radius: 50%; background: #22c55e; box-shadow: 0 0 8px #22c55e; }

.hero-title { font-size: clamp(32px, 4vw, 42px); font-weight: 800; margin-bottom: 15px; line-height: 1.3; }
.hero-title span {
  background: linear-gradient(135deg, #f97316, #facc15);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-subtitle { font-size: 16px; color: var(--text-muted); margin-bottom: 20px; max-width: 500px; }

.hero-pills { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 25px; }
.pill {
  padding: 5px 12px; border-radius: 20px; border: 1px solid var(--border-soft);
  font-size: 13px; color: #e5e7eb; background: rgba(255,255,255,0.03);
}

.hero-cta-row { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 20px; }
.hero-main-btn, .hero-ghost-btn {
  padding: 12px 20px; border-radius: 999px; cursor: pointer; font-weight: 700; font-size: 15px;
  display: inline-flex; align-items: center; gap: 8px; transition: 0.2s;
}
.hero-main-btn { border: none; background: linear-gradient(135deg, var(--primary), var(--primary-dark)); color: #fff; box-shadow: 0 10px 30px rgba(248,113,22,0.3); }
.hero-ghost-btn { border: 1px solid var(--border-soft); background: rgba(255,255,255,0.05); color: #fff; }
.hero-main-btn:hover, .hero-ghost-btn:hover { transform: translateY(-2px); }

/* Hero Right Card */
.hero-right-card {
  background: radial-gradient(circle at top left, #1e293b, #020617);
  border: 1px solid var(--border-soft); border-radius: 24px; padding: 20px;
  box-shadow: 0 20px 50px rgba(0,0,0,0.5);
}
.hero-stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 15px; }
.stat-card { background: rgba(255,255,255,0.03); padding: 10px; border-radius: 12px; border: 1px solid var(--border-soft); text-align: center; }
.stat-value { font-size: 18px; font-weight: 800; color: #fff; }
.stat-label { font-size: 12px; color: var(--text-muted); }

/* ===== Section Common ===== */
section { padding: 60px 0; border-bottom: 1px solid rgba(255,255,255,0.05); }
.section-header { margin-bottom: 30px; text-align: left; }
.section-kicker { color: var(--accent); font-weight: 800; letter-spacing: 2px; font-size: 13px; margin-bottom: 5px; }
.section-title { font-size: 28px; font-weight: 800; color: #fff; margin-bottom: 10px; }
.section-desc { color: var(--text-muted); font-size: 15px; max-width: 600px; }

/* Features Grid (Teaching) */
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
.feature {
  background: var(--card); padding: 25px; border-radius: 16px; border: 1px solid var(--border-soft);
  transition: 0.3s;
}
.feature:hover { border-color: var(--primary); transform: translateY(-3px); }
.feature-icon { font-size: 28px; margin-bottom: 10px; }
.feature-title { font-size: 16px; font-weight: 700; color: #fff; margin-bottom: 5px; }
.feature-text { font-size: 14px; color: var(--text-muted); }

/* Curriculum */
.curriculum-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
.curr-card { background: var(--bg-light); padding: 20px; border-radius: 16px; border-left: 4px solid var(--primary); margin-bottom: 15px; }
.curr-head { display: flex; justify-content: space-between; margin-bottom: 10px; }
.curr-level { font-weight: 700; color: #fff; font-size: 16px; }
.curr-list span { display: inline-block; background: rgba(255,255,255,0.05); padding: 4px 10px; border-radius: 4px; font-size: 13px; margin: 0 5px 5px 0; color: var(--text-muted); }

/* News */
.news-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; }
.news-card { background: var(--card); border-radius: 12px; overflow: hidden; border: 1px solid var(--border-soft); display: block; }
.news-img { height: 180px; background: #000; overflow: hidden; }
.news-img img { width: 100%; height: 100%; object-fit: cover; transition: 0.5s; }
.news-card:hover .news-img img { transform: scale(1.1); }
.news-body { padding: 20px; }
.news-date { color: var(--accent); font-size: 13px; font-weight: 700; margin-bottom: 5px; }
.news-title { font-size: 16px; font-weight: 700; color: #fff; margin-bottom: 8px; }
.news-content { font-size: 14px; color: var(--text-muted); display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }

/* Reviews */
.reviews-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; margin-top: 20px; }
.review-card { background: var(--bg-light); padding: 20px; border-radius: 16px; border: 1px solid var(--border-soft); }
.stars { color: #f59e0b; margin-bottom: 10px; font-size: 14px; }
.review-text { font-style: italic; color: #fff; font-size: 14px; margin-bottom: 15px; }
.review-meta { display: flex; justify-content: space-between; font-size: 12px; color: var(--text-muted); }
.stats-row { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 20px; }
.stat-pill { background: rgba(56,189,248,0.1); color: #38bdf8; padding: 6px 12px; border-radius: 20px; font-size: 13px; font-weight: 700; border: 1px solid rgba(56,189,248,0.2); }

/* Pricing */
.pricing-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 20px; }
.price-card { 
  background: var(--card); border: 1px solid var(--border-soft); border-radius: 20px; padding: 25px; 
  position: relative; display: flex; flex-direction: column;
}
.price-tag { position: absolute; top: 0; right: 0; background: var(--accent); color: #000; padding: 5px 15px; font-size: 12px; font-weight: 700; border-bottom-left-radius: 15px; }
.price-title { font-size: 20px; font-weight: 800; color: #fff; margin-bottom: 5px; }
.price-price { font-size: 32px; font-weight: 900; color: #fff; margin: 15px 0; }
.price-price span { font-size: 14px; font-weight: 400; color: var(--text-muted); }
.price-features li { margin-bottom: 8px; font-size: 14px; color: var(--text-muted); display: flex; gap: 8px; }
.price-features li i { color: var(--primary); }

/* Contact */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.contact-info h3 { color: #fff; margin-bottom: 20px; }
.contact-item { margin-bottom: 15px; color: var(--text-muted); font-size: 14px; }
.contact-item i { width: 20px; color: var(--primary); text-align: center; margin-right: 10px; }
.contact-form input, .contact-form textarea {
  width: 100%; padding: 12px; margin-bottom: 15px;
  background: rgba(255,255,255,0.03); border: 1px solid var(--border-soft); border-radius: 8px;
  color: #fff; outline: none; font-size: 14px;
}
.contact-form input:focus, .contact-form textarea:focus { border-color: var(--accent); }
.submit-btn { 
  width: 100%; padding: 12px; background: var(--primary); color: #fff; font-weight: 700; 
  border: none; border-radius: 8px; cursor: pointer; transition: 0.2s;
}
.submit-btn:hover { filter: brightness(1.1); }

/* Footer */
footer { border-top: 1px solid var(--border-soft); padding: 40px 0; text-align: center; font-size: 13px; color: var(--text-muted); margin-top: 60px; }

/* Floating Buttons */
.float-stack { position: fixed; right: 20px; bottom: 20px; display: flex; flex-direction: column; gap: 10px; z-index: 999; }
.float-btn { width: 48px; height: 48px; border-radius: 50%; display: grid; place-items: center; color: #fff; font-size: 20px; box-shadow: 0 5px 15px rgba(0,0,0,0.5); transition: 0.2s; }
.float-btn:hover { transform: translateY(-3px); }
.float-line { background: #06C755; }
.float-fb { background: #1877F2; }
.float-yt { background: #FF0000; }

/* RWD */
@media (max-width: 900px) {
  .hero-grid, .curriculum-grid, .contact-grid { grid-template-columns: 1fr; }
  .hero-right-card { order: -1; }
}
@media (max-width: 640px) {
  .nav-links { display: none; position: absolute; top: 100%; left: 0; width: 100%; background: var(--bg-light); flex-direction: column; padding: 20px; text-align: center; }
  .nav-links.active { display: flex; }
  .menu-toggle { display: block; }
  .nav-cta-btn { display: none; }
  .hero-stats-grid { grid-template-columns: 1fr; }
}