:root {
  --primary: #07c160;
  --primary-dark: #06ad56;
  --ink: #1a1a1a;
  --ink-soft: #5b6b7b;
  --bg: #ffffff;
  --bg-alt: #f6f9f8;
  --border: #e6ebe9;
  --radius: 14px;
  --shadow: 0 6px 24px rgba(0, 0, 0, 0.06);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  color: var(--ink);
  line-height: 1.6;
  background: var(--bg);
}

.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

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

/* Nav */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; }
.brand-mark {
  width: 32px; height: 32px; border-radius: 9px;
  background: var(--primary); color: #fff;
  display: grid; place-items: center; font-size: 18px;
}
.nav-links { display: flex; gap: 28px; }
.nav-links a { color: var(--ink-soft); font-size: 15px; transition: color .2s; }
.nav-links a:hover { color: var(--primary); }
.nav-actions { display: flex; gap: 12px; }

/* Buttons */
.btn {
  display: inline-block; padding: 9px 18px; border-radius: 10px;
  font-size: 15px; font-weight: 600; cursor: pointer; transition: all .2s;
  border: 1px solid transparent;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost { color: var(--ink-soft); }
.btn-ghost:hover { color: var(--primary); }
.btn-outline { border-color: var(--primary); color: var(--primary); background: #fff; }
.btn-outline:hover { background: var(--bg-alt); }
.btn-lg { padding: 14px 30px; font-size: 16px; }
.btn-block { display: block; width: 100%; text-align: center; }

/* Hero */
.hero { padding: 96px 0 80px; background: linear-gradient(180deg, #f0faf5 0%, #ffffff 100%); text-align: center; }
.hero h1 { font-size: 50px; line-height: 1.2; font-weight: 800; letter-spacing: -1px; }
.hl { color: var(--primary); }
.hero-sub { margin: 24px auto 0; max-width: 640px; font-size: 18px; color: var(--ink-soft); }
.hero-cta { margin-top: 36px; display: flex; gap: 16px; justify-content: center; }
.hero-note { margin-top: 20px; font-size: 14px; color: #9aa7b1; }

/* Sections */
.section { padding: 80px 0; }
.section-alt { background: var(--bg-alt); }
.section-title { font-size: 34px; font-weight: 800; text-align: center; letter-spacing: -0.5px; }
.section-sub { text-align: center; color: var(--ink-soft); margin-top: 12px; }

.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 48px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; margin-top: 48px; }

.card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 32px 28px; }
.card-icon { font-size: 36px; margin-bottom: 14px; }
.card h3 { font-size: 20px; margin-bottom: 10px; }
.card p { color: var(--ink-soft); }

.feature { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; }
.feature h3 { font-size: 19px; margin-bottom: 10px; }
.feature p { color: var(--ink-soft); }

/* Pricing */
.pricing { margin-top: 40px; align-items: start; }
.price-card { position: relative; background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 36px 28px; text-align: center; }
.price-popular { border-color: var(--primary); box-shadow: var(--shadow); transform: translateY(-8px); }
.price-badge { position: absolute; top: -13px; left: 50%; transform: translateX(-50%); background: var(--primary); color: #fff; font-size: 13px; padding: 4px 14px; border-radius: 999px; }
.price-name { font-size: 18px; font-weight: 700; color: var(--ink-soft); }
.price-amount { font-size: 44px; font-weight: 800; margin: 14px 0 8px; }
.price-amount span { font-size: 16px; font-weight: 500; color: var(--ink-soft); }
.price-list { list-style: none; text-align: left; margin: 24px 0; }
.price-list li { padding: 8px 0; color: var(--ink-soft); border-bottom: 1px dashed var(--border); }
.price-list b { color: var(--primary); }

/* FAQ */
.faq { max-width: 760px; margin: 44px auto 0; }
.faq details { background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 18px 22px; margin-bottom: 14px; }
.faq summary { font-weight: 600; cursor: pointer; font-size: 16px; }
.faq p { margin-top: 12px; color: var(--ink-soft); }

/* Footer */
.footer { border-top: 1px solid var(--border); padding: 32px 0; color: var(--ink-soft); }
.footer-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; }
.footer-links { display: flex; gap: 20px; }
.footer-links a:hover { color: var(--primary); }

/* Auth pages */
.auth-wrap { min-height: 100vh; display: grid; place-items: center; background: linear-gradient(180deg, #f0faf5, #fff); padding: 24px; }
.auth-card { width: 100%; max-width: 400px; background: #fff; border: 1px solid var(--border); border-radius: 18px; padding: 40px 34px; box-shadow: var(--shadow); }
.auth-card h1 { font-size: 24px; text-align: center; margin-bottom: 6px; }
.auth-card .sub { text-align: center; color: var(--ink-soft); margin-bottom: 28px; font-size: 14px; }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 14px; margin-bottom: 6px; color: var(--ink-soft); }
.field input, .field select { width: 100%; padding: 12px 14px; border: 1px solid var(--border); border-radius: 10px; font-size: 15px; outline: none; transition: border .2s; }
.field input:focus, .field select:focus { border-color: var(--primary); }
.msg { font-size: 14px; padding: 10px 14px; border-radius: 8px; margin-bottom: 16px; display: none; }
.msg.show { display: block; }
.msg.err { background: #fdecec; color: #d83a3a; }
.msg.ok { background: #e8f9f0; color: var(--primary-dark); }
.auth-foot { text-align: center; margin-top: 18px; font-size: 14px; color: var(--ink-soft); }
.auth-foot a { color: var(--primary); }

/* How to get */
.how-to-get { background: var(--bg-alt); }
.how-to-get-card {
  max-width: 560px; margin: 0 auto; text-align: center;
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 40px 32px; box-shadow: var(--shadow);
}
.how-to-get-title { font-size: 28px; font-weight: 800; margin-bottom: 12px; }
.how-to-get-text { color: var(--ink-soft); font-size: 17px; margin-bottom: 24px; line-height: 1.7; }
.how-to-get-text strong { color: var(--primary-dark); }

/* Changelog */
.changelog-wrap { max-width: 720px; }
.changelog-list { margin-top: 40px; display: flex; flex-direction: column; gap: 16px; }
.changelog-loading,
.changelog-empty { text-align: center; color: var(--ink-soft); padding: 32px 0; }
.changelog-item {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px 28px; transition: box-shadow .2s;
}
.changelog-item:hover { box-shadow: var(--shadow); }
.changelog-latest { border-color: var(--primary); box-shadow: 0 4px 16px rgba(7, 193, 96, 0.12); }
.changelog-head { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 14px; margin-bottom: 10px; }
.changelog-ver,
.changelog-version { font-size: 20px; font-weight: 800; color: var(--ink); }
.changelog-badge {
  font-size: 12px; font-weight: 600; color: #fff; background: var(--primary);
  padding: 3px 10px; border-radius: 999px;
}
.changelog-date { font-size: 14px; color: var(--ink-soft); margin-left: auto; }
.changelog-summary { color: var(--ink-soft); margin-bottom: 12px; line-height: 1.65; }
.changelog-items { margin: 0; padding-left: 20px; color: var(--ink-soft); }
.changelog-items li { margin-bottom: 6px; line-height: 1.55; }
.nav-links a.active { color: var(--primary); font-weight: 600; }

@media (max-width: 860px) {
  .nav-links { display: none; }
  .hero h1 { font-size: 34px; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .price-popular { transform: none; }
}