/* 词汇生长 · 官方网站样式（延续产品绿 + 米黄基因） */
:root {
  --green: #2E7D32; --green-mid: #43A047; --green-soft: #E8F5E9;
  --bg: #FAF7F0; --card: #ffffff; --ink: #1B2B22; --ink-2: #5A6B60;
  --line: #E3E8E4; --radius: 16px; --cream: #F5EFDF;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
html, body { overflow-x: hidden; max-width: 100%; }
body { font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif; background: var(--bg); color: var(--ink); line-height: 1.65; }
img { max-width: 100%; display: block; }
a { color: var(--green); }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }
.section { padding: 72px 0; }
.sec-title { font-size: 30px; text-align: center; margin-bottom: 8px; }
.sec-sub { text-align: center; color: var(--ink-2); margin-bottom: 40px; font-size: 15px; }

/* 按钮 */
.btn { display: inline-block; padding: 12px 22px; border-radius: 12px; text-decoration: none; font-weight: 700; font-size: 15px; transition: transform .15s, box-shadow .15s; border: none; cursor: pointer; }
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: linear-gradient(135deg, #2E7D32, #43A047); color: #fff; box-shadow: 0 6px 18px rgba(46,125,50,.3); }
.btn-outline { border: 2px solid var(--green); color: var(--green); background: transparent; }
.btn-lg { padding: 15px 28px; font-size: 16px; border-radius: 14px; }
.btn-xl { padding: 18px 34px; font-size: 18px; border-radius: 16px; }
.btn-light { background: #fff; color: var(--green); }
.btn-outline-light { border: 2px solid rgba(255,255,255,.8); color: #fff; background: transparent; }

/* 导航 */
.nav { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.92); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.nav-inner { max-width: 1080px; margin: 0 auto; padding: 10px 20px; display: flex; align-items: center; gap: 20px; }
.logo { font-weight: 800; font-size: 17px; color: var(--ink); text-decoration: none; display: flex; align-items: center; gap: 6px; }
.logo-ic { font-size: 20px; }
.nav-links { display: flex; gap: 22px; margin-left: auto; }
.nav-links a { color: var(--ink-2); text-decoration: none; font-size: 14px; font-weight: 600; }
.nav-links a:hover { color: var(--green); }
.btn-nav { padding: 8px 18px; font-size: 14px; }

/* Hero */
.hero { padding: 70px 0 60px; background: linear-gradient(180deg, var(--green-soft), var(--bg)); }
.hero-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 40px; align-items: center; }
.hero-badge { display: inline-block; background: #fff; border: 1px solid var(--line); border-radius: 999px; padding: 5px 14px; font-size: 13px; color: var(--green); font-weight: 600; margin-bottom: 18px; }
.hero h1 { font-size: 44px; line-height: 1.25; margin-bottom: 16px; }
.accent { color: var(--green); }
.hero-sub { font-size: 16.5px; color: var(--ink-2); margin-bottom: 26px; max-width: 460px; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 18px; }
.hero-cta.center { justify-content: center; }
.hero-chips { display: flex; gap: 14px; flex-wrap: wrap; font-size: 13px; color: var(--ink-2); font-weight: 600; }
.hero-img img { border-radius: 24px; border: 6px solid #fff; box-shadow: 0 24px 60px rgba(27,43,34,.18); max-height: 560px; width: auto; margin: 0 auto; }

/* 痛点 */
.pain { background: var(--cream); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 22px; }
.pain-ic { font-size: 36px; margin-bottom: 10px; }
.pain-card h3 { font-size: 18px; margin-bottom: 6px; }
.pain-card p { color: var(--ink-2); font-size: 14.5px; }

/* 方法论 */
.loop { display: flex; align-items: stretch; gap: 10px; justify-content: center; flex-wrap: wrap; }
.loop-step { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px 20px; text-align: center; flex: 1; min-width: 150px; }
.loop-ic { font-size: 30px; }
.loop-name { font-size: 20px; font-weight: 800; color: var(--green); margin: 6px 0; }
.loop-step p { font-size: 13.5px; color: var(--ink-2); }
.loop-arrow { align-self: center; font-size: 24px; color: var(--green-mid); font-weight: 800; }
.method-note { text-align: center; color: var(--ink-2); font-size: 13.5px; margin-top: 26px; }

/* 功能 */
.features { background: linear-gradient(180deg, var(--bg), #fff, var(--bg)); }
.feat-row { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; align-items: center; margin-bottom: 70px; }
.feat-row.rev .feat-tx { order: 2; }
.feat-row.rev .feat-img { order: 1; }
.feat-tx h3 { font-size: 24px; margin-bottom: 12px; }
.feat-tx p { color: var(--ink-2); font-size: 15.5px; }
.feat-img img { border-radius: 20px; border: 5px solid #fff; box-shadow: 0 18px 44px rgba(27,43,34,.16); max-height: 480px; width: auto; margin: 0 auto; }
.feat-more { margin-top: 10px; margin-bottom: 0; }
.f-ic { font-size: 28px; margin-bottom: 8px; }
.feat-more h3 { font-size: 16.5px; margin-bottom: 6px; }
.feat-more p { font-size: 13.5px; color: var(--ink-2); }

/* 隐私 */
.privacy { background: var(--green); color: #fff; }
.privacy .sec-title, .privacy .sec-sub { color: #fff; }
.privacy-inner { max-width: 860px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 10px; }
.p-item { background: rgba(255,255,255,.12); border-radius: 14px; padding: 20px 16px; text-align: center; }
.p-item b { display: block; font-size: 17px; margin-bottom: 4px; }
.p-item span { font-size: 13px; opacity: .85; }

/* FAQ */
.faq-wrap { max-width: 760px; }
details { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 16px 20px; margin-bottom: 10px; }
summary { font-weight: 700; cursor: pointer; font-size: 15.5px; }
details p { margin-top: 10px; color: var(--ink-2); font-size: 14.5px; }

/* 尾部行动区 */
.final-cta { background: linear-gradient(135deg, #2E7D32, #43A047); color: #fff; text-align: center; }
.final-inner h2 { font-size: 30px; margin-bottom: 10px; }
.final-inner p { opacity: .9; margin-bottom: 26px; }

/* 页脚 */
.footer { background: #14301C; color: rgba(255,255,255,.8); padding: 34px 0; text-align: center; font-size: 13.5px; }
.footer-inner p { margin: 4px 0; }
.footer b { color: #fff; }

/* 下载页 */
.dl-hero { background: linear-gradient(180deg, var(--green-soft), var(--bg)); padding: 60px 0 30px; text-align: center; }
.dl-hero h1 { font-size: 34px; margin-bottom: 8px; }
.dl-hero p { color: var(--ink-2); }
.ver-chip { display: inline-block; background: #fff; border: 1px solid var(--line); border-radius: 999px; padding: 7px 18px; font-size: 13.5px; font-weight: 600; color: var(--green); margin-top: 16px; }
.dl-section { padding: 40px 0 10px; }
.dl-grid { max-width: 720px; }
.path-tag { display: inline-block; background: var(--green-soft); color: var(--green); font-weight: 700; font-size: 13px; border-radius: 999px; padding: 4px 14px; margin-bottom: 10px; }
.path-tag.alt { background: var(--cream); }
.dl-section h2, .dl-alt h2 { font-size: 26px; margin-bottom: 6px; }
.dl-sub { color: var(--ink-2); margin-bottom: 20px; }
.dl-sub, .alt-link { font-size: 14px; }
.alt-link { margin: 14px 0 30px; color: var(--ink-2); }
.steps { margin-top: 30px; }
.steps h3 { font-size: 17px; margin-bottom: 14px; }
.step { display: flex; gap: 14px; align-items: flex-start; margin-bottom: 14px; }
.step-n { flex-shrink: 0; width: 30px; height: 30px; border-radius: 50%; background: var(--green); color: #fff; font-weight: 800; display: flex; align-items: center; justify-content: center; font-size: 15px; }
.step b { display: block; font-size: 15px; }
.step span { font-size: 13.5px; color: var(--ink-2); }
.qr-box { margin-top: 26px; display: flex; align-items: center; gap: 16px; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; max-width: 340px; }
.qr-box img { width: 110px; border-radius: 10px; }
.qr-box p { font-size: 13px; color: var(--ink-2); }
.qr-box b { display: block; font-size: 14.5px; color: var(--ink); }
.dl-alt { padding: 30px 0 10px; }
.changelog { background: var(--cream); }
.log-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px 26px; max-width: 720px; margin: 0 auto; }
.log-ver { font-weight: 800; font-size: 17px; margin-bottom: 8px; }
.log-ver span { color: var(--ink-2); font-weight: 500; font-size: 13.5px; margin-left: 8px; }
.log-card ul { padding-left: 20px; }
.log-card li { color: var(--ink-2); font-size: 14.5px; margin: 4px 0; }
.log-loading { color: var(--ink-2); font-size: 14px; }

/* 响应式 */
@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; text-align: center; }
  .hero-sub { margin: 0 auto 26px; }
  .hero-cta { justify-content: center; }
  .hero-chips { justify-content: center; }
  .hero h1 { font-size: 34px; }
  .hero-img img { max-height: 440px; }
  .feat-row { grid-template-columns: 1fr; gap: 22px; margin-bottom: 50px; }
  .feat-row.rev .feat-tx { order: 1; }
  .feat-row.rev .feat-img { order: 2; }
  .grid-3 { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .nav-links { display: none; }
  .sec-title { font-size: 25px; }
  .loop-arrow { display: none; }
  .loop-step { min-width: 45%; }
}