/* LINE 中文版官网 — 电脑端专用 */
:root {
  --line-green: #06c755;
  --line-green-dark: #05b04c;
  --line-green-deep: #049940;
  --line-green-light: #e8f9ef;
  --line-gradient: linear-gradient(135deg, #06c755 0%, #00b900 50%, #049940 100%);
  --line-gradient-soft: linear-gradient(180deg, #e8f9ef 0%, #ffffff 100%);
  --text: #1a1a2e;
  --text-secondary: #4a5568;
  --text-muted: #718096;
  --bg: #ffffff;
  --bg-alt: #f7faf8;
  --border: #e2ebe6;
  --shadow: 0 8px 32px rgba(6, 199, 85, 0.12);
  --shadow-lg: 0 20px 60px rgba(6, 199, 85, 0.16);
  --radius: 12px;
  --radius-lg: 20px;
  --header-h: 72px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  min-width: 1024px;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--line-green-dark); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--line-green-deep); }
img { max-width: 100%; display: block; }
ul { list-style: none; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 32px; }

.header {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--header-h);
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
}

.header-inner { display: flex; align-items: center; justify-content: space-between; height: 100%; }

.logo { display: flex; align-items: center; gap: 12px; font-size: 22px; font-weight: 700; color: var(--text); }

.logo-icon {
  width: 44px; height: 44px;
  background: var(--line-gradient);
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 14px; font-weight: 800;
  letter-spacing: -0.5px;
  box-shadow: 0 4px 16px rgba(6,199,85,0.35);
}

.nav { display: flex; gap: 4px; }
.nav a { padding: 10px 16px; border-radius: 10px; color: var(--text-secondary); font-size: 15px; font-weight: 500; }
.nav a:hover, .nav a.active { color: var(--line-green-dark); background: var(--line-green-light); }

.header-download {
  padding: 12px 28px; background: var(--line-gradient); color: #fff;
  border: none; border-radius: 12px; font-size: 15px; font-weight: 600; cursor: pointer;
  box-shadow: 0 4px 16px rgba(6,199,85,0.3); transition: transform 0.2s;
}
.header-download:hover { transform: translateY(-2px); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 32px; border-radius: 12px; font-size: 16px; font-weight: 600;
  border: none; cursor: pointer; transition: all 0.25s;
}
.btn-primary { background: var(--line-gradient); color: #fff; box-shadow: 0 6px 20px rgba(6,199,85,0.35); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 28px rgba(6,199,85,0.45); }
.btn-outline { background: transparent; color: var(--line-green-dark); border: 2px solid var(--line-green); }
.btn-outline:hover { background: var(--line-green-light); }
.btn-lg { padding: 18px 40px; font-size: 17px; }

.hero {
  padding: calc(var(--header-h) + 80px) 0 100px;
  background: var(--line-gradient-soft);
  position: relative; overflow: hidden;
}
.hero::after {
  content: ""; position: absolute; top: -150px; right: -80px;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(6,199,85,0.12) 0%, transparent 70%);
  border-radius: 50%;
}
.hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; position: relative; }

.hero-badge {
  display: inline-block; padding: 6px 16px;
  background: var(--line-green-light); color: var(--line-green-deep);
  border-radius: 20px; font-size: 13px; font-weight: 600; margin-bottom: 20px;
}
.hero h1 { font-size: 50px; font-weight: 800; line-height: 1.15; margin-bottom: 24px; }
.hero h1 span {
  background: var(--line-gradient);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero-desc { font-size: 18px; color: var(--text-secondary); margin-bottom: 36px; max-width: 520px; }
.hero-actions { display: flex; gap: 16px; }

.chat-mockup {
  background: #fff; border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg); overflow: hidden; border: 1px solid var(--border);
}
.mockup-header {
  background: var(--line-gradient); padding: 16px 20px; color: #fff;
  display: flex; align-items: center; gap: 12px;
}
.mockup-avatar {
  width: 40px; height: 40px; background: rgba(255,255,255,0.25);
  border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 18px;
}
.mockup-body { padding: 24px; min-height: 300px; background: #f0faf4; }

.chat-bubble {
  max-width: 78%; padding: 12px 16px; border-radius: 18px;
  margin-bottom: 12px; font-size: 14px; line-height: 1.5;
}
.chat-bubble.in { background: #fff; border: 1px solid var(--border); border-bottom-left-radius: 4px; }
.chat-bubble.out { background: var(--line-green); color: #fff; margin-left: auto; border-bottom-right-radius: 4px; }

.sticker-row { display: flex; gap: 8px; margin-top: 16px; }
.sticker { font-size: 32px; padding: 8px; background: #fff; border-radius: 12px; border: 1px solid var(--border); }

.stats { padding: 60px 0; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 40px; text-align: center; }
.stat-num { font-size: 42px; font-weight: 800; color: var(--line-green); line-height: 1.2; }
.stat-label { color: var(--text-muted); font-size: 15px; margin-top: 8px; }

.section { padding: 90px 0; }
.section-alt { background: var(--bg-alt); }
.section-head { text-align: center; max-width: 680px; margin: 0 auto 60px; }
.section-head h2 { font-size: 38px; font-weight: 700; margin-bottom: 16px; }
.section-head p { font-size: 17px; color: var(--text-secondary); }

.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.feature-card {
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 36px 28px; transition: all 0.3s;
}
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: var(--line-green); }
.feature-icon {
  width: 56px; height: 56px; background: var(--line-green-light); border-radius: 14px;
  display: flex; align-items: center; justify-content: center; font-size: 26px; margin-bottom: 20px;
}
.feature-card h3 { font-size: 20px; margin-bottom: 12px; }
.feature-card p { color: var(--text-secondary); font-size: 15px; }

.page-hero {
  padding: calc(var(--header-h) + 48px) 0 56px;
  background: var(--line-gradient-soft); text-align: center;
}
.page-hero h1 { font-size: 42px; font-weight: 800; margin-bottom: 16px; }
.page-hero p { font-size: 18px; color: var(--text-secondary); max-width: 640px; margin: 0 auto; }
.breadcrumb { display: flex; justify-content: center; gap: 8px; margin-bottom: 24px; font-size: 14px; color: var(--text-muted); }
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--line-green-dark); }

.download-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.download-card {
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 40px 32px; text-align: center; transition: all 0.3s;
}
.download-card:hover { border-color: var(--line-green); box-shadow: var(--shadow); }
.download-icon { font-size: 48px; margin-bottom: 16px; }
.download-card h3 { font-size: 20px; margin-bottom: 8px; }
.download-card p { color: var(--text-muted); font-size: 14px; margin-bottom: 24px; }

.sticker-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.sticker-card {
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; text-align: center; transition: all 0.25s;
}
.sticker-card:hover { border-color: var(--line-green); transform: scale(1.03); }
.sticker-emoji { font-size: 48px; margin-bottom: 12px; }
.sticker-card span { font-size: 14px; color: var(--text-secondary); }

.faq-list { max-width: 820px; margin: 0 auto; }
.faq-item { border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 12px; overflow: hidden; }
.faq-question {
  width: 100%; padding: 20px 24px; background: var(--bg); border: none; text-align: left;
  font-size: 16px; font-weight: 600; cursor: pointer;
  display: flex; justify-content: space-between; align-items: center;
}
.faq-question:hover { background: var(--bg-alt); }
.faq-answer { padding: 0 24px; max-height: 0; overflow: hidden; transition: all 0.3s; color: var(--text-secondary); font-size: 15px; }
.faq-item.open .faq-answer { padding: 0 24px 20px; max-height: 400px; }
.faq-toggle { color: var(--line-green); font-size: 20px; transition: transform 0.3s; }
.faq-item.open .faq-toggle { transform: rotate(45deg); }

.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.content-page { max-width: 820px; margin: 0 auto; }
.content-page h2 { font-size: 26px; margin: 36px 0 16px; }
.content-page p, .content-page li { color: var(--text-secondary); margin-bottom: 12px; font-size: 15px; }
.content-page ul { padding-left: 24px; list-style: disc; }

.timeline-item { display: flex; gap: 28px; margin-bottom: 32px; }
.timeline-year { width: 80px; font-weight: 800; color: var(--line-green); font-size: 18px; flex-shrink: 0; }

.cta {
  padding: 90px 0; background: var(--line-gradient); text-align: center; color: #fff;
}
.cta h2 { font-size: 36px; margin-bottom: 16px; }
.cta p { font-size: 18px; opacity: 0.92; margin-bottom: 32px; }
.cta .btn-primary { background: #fff; color: var(--line-green-dark); }

.footer { background: #0f172a; color: #94a3b8; padding: 64px 0 32px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.footer-brand p { margin-top: 16px; font-size: 14px; line-height: 1.7; }
.footer-col h4 { color: #fff; font-size: 15px; margin-bottom: 18px; }
.footer-col li { margin-bottom: 10px; }
.footer-col a { color: #94a3b8; font-size: 14px; }
.footer-col a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid #1e293b; padding-top: 24px; display: flex; justify-content: space-between; font-size: 13px; }
.footer-bottom a { color: #64748b; }
.footer-bottom a:hover { color: #fff; }