/* ============================================================
   FairwayIndex — Site Stylesheet
   绿色主色 #1a7f37 / 深绿 #0f3d1e，浅底 #f7f8fa
   ============================================================ */

:root {
  --green: #1a7f37;
  --green-dark: #0f3d1e;
  --green-deep: #0a2b15;
  --green-soft: #eaf5ec;
  --text: #1f2328;
  --text-soft: #59636e;
  --border: #d8dee4;
  --bg: #f7f8fa;
  --card: #ffffff;
  --danger: #c0392b;
  --danger-soft: #ffeef0;
  --warn: #9a6b00;
  --warn-soft: #fff8e6;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(15,61,30,.06), 0 4px 16px rgba(15,61,30,.05);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 15.5px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; }
a { color: var(--green); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { line-height: 1.3; color: var(--text); margin: 0 0 12px; }
h1 { font-size: 30px; letter-spacing: -.3px; }
h2 { font-size: 24px; letter-spacing: -.2px; }
h3 { font-size: 19px; }
p { margin: 0 0 14px; }
ul, ol { margin: 0 0 14px; padding-left: 22px; }
li { margin: 5px 0; }
code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: .9em;
  background: #eef1f4;
  color: #c7254e;
  padding: 2px 6px;
  border-radius: 4px;
}
.container { max-width: 1120px; margin: 0 auto; padding: 0 20px; }
.inline-form { display: inline; }

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-block;
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 14.5px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  text-align: center;
  transition: all .15s;
  font-family: var(--font);
  line-height: 1.4;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:disabled { opacity: .6; cursor: not-allowed; transform: none; }
.btn-primary { background: var(--green); color: #fff; }
.btn-primary:hover { background: #15702f; }
.btn-outline { background: transparent; color: var(--green); border-color: var(--green); }
.btn-outline:hover { background: var(--green-soft); }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--border); }
.btn-ghost:hover { background: #f0f2f5; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-sm { padding: 7px 14px; font-size: 13.5px; }
.btn-lg { padding: 13px 28px; font-size: 16px; }
.btn-block { width: 100%; }

/* ---------------- 头部导航 ---------------- */
.site-header {
  background: var(--green-deep);
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: 0 1px 0 rgba(255,255,255,.06);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 62px;
  gap: 16px;
}
.brand { display: flex; align-items: center; gap: 9px; }
.brand:hover { text-decoration: none; }
.brand-name { color: #fff; font-size: 18px; font-weight: 700; letter-spacing: .2px; }

.site-nav { display: flex; align-items: center; gap: 4px; flex: 1; justify-content: flex-end; }
.nav-item { position: relative; }
.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: #d7e6db;
  background: none;
  border: 0;
  font: inherit;
  font-size: 14.5px;
  font-weight: 500;
  padding: 9px 13px;
  border-radius: 7px;
  cursor: pointer;
}
.nav-link:hover { color: #fff; background: rgba(255,255,255,.08); }
.caret { transition: transform .15s; }
.nav-item:hover .caret, .nav-item:focus-within .caret { transform: rotate(180deg); }

.dropdown {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  min-width: 250px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 10px 32px rgba(0,0,0,.14);
  padding: 7px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: all .15s;
  z-index: 60;
}
.nav-item:hover .dropdown, .nav-item:focus-within .dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown a {
  display: block;
  padding: 8px 12px;
  color: var(--text);
  font-size: 14px;
  border-radius: 6px;
}
.dropdown a:hover { background: var(--green-soft); color: var(--green); text-decoration: none; }

.nav-auth { display: flex; align-items: center; gap: 8px; margin-left: 10px; }
.nav-auth .btn-ghost { color: #e8f2ea; border-color: rgba(255,255,255,.28); }
.nav-auth .btn-ghost:hover { background: rgba(255,255,255,.1); }

.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 20px; height: 2px; background: #fff; margin: 4px 0; border-radius: 2px; transition: all .2s; }

/* ---------------- Flash ---------------- */
.flash {
  padding: 12px 16px;
  border-radius: 8px;
  margin: 16px auto;
  font-size: 14px;
  font-weight: 500;
  max-width: 1120px;
}
.flash-success { background: var(--green-soft); color: var(--green-dark); border: 1px solid #bfe3c6; }
.flash-error { background: var(--danger-soft); color: #7f1d1d; border: 1px solid #f3c1bb; }
.flash-info { background: #e8f1fb; color: #1d4f8f; border: 1px solid #c3dcf5; }

/* ---------------- Hero ---------------- */
.hero {
  background: linear-gradient(135deg, var(--green-deep) 0%, var(--green-dark) 55%, #14532d 100%);
  color: #fff;
  padding: 72px 0 84px;
  position: relative;
  overflow: hidden;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: url('/images/hero-pattern.svg') repeat-x bottom / auto 140px;
  opacity: .35;
  pointer-events: none;
}
.hero .container { position: relative; z-index: 1; display: grid; grid-template-columns: 1.15fr .85fr; gap: 48px; align-items: center; }
.hero h1 { color: #fff; font-size: 40px; letter-spacing: -.5px; margin-bottom: 16px; }
.hero p.lead { color: #cfe6d6; font-size: 17.5px; margin-bottom: 26px; max-width: 560px; }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-cta .btn-primary { background: #fff; color: var(--green-deep); }
.hero-cta .btn-primary:hover { background: #eaf5ec; }
.hero-cta .btn-outline { border-color: rgba(255,255,255,.5); color: #fff; }
.hero-cta .btn-outline:hover { background: rgba(255,255,255,.12); }
.hero-meta { margin-top: 22px; font-size: 13px; color: #a9c8b2; display: flex; gap: 18px; flex-wrap: wrap; }

.hero-card {
  background: #fff;
  color: var(--text);
  border-radius: 16px;
  padding: 26px;
  box-shadow: 0 20px 50px rgba(0,0,0,.25);
}
.hero-card h3 { margin-bottom: 6px; }
.hero-card .formula {
  background: var(--green-soft);
  border-left: 4px solid var(--green);
  padding: 12px 14px;
  border-radius: 0 8px 8px 0;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 13.5px;
  margin: 14px 0;
  color: var(--green-dark);
}
.hero-card .mini-cta { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }

/* ---------------- 区块 ---------------- */
.section { padding: 64px 0; }
.section-alt { background: #fff; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-head { text-align: center; max-width: 700px; margin: 0 auto 40px; }
.section-head h2 { margin-bottom: 10px; }
.section-head p { color: var(--text-soft); font-size: 16px; }

/* 卡片网格 */
.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}
.card h3 { margin-bottom: 8px; font-size: 17px; }
.card p { color: var(--text-soft); font-size: 14px; margin-bottom: 14px; }
.card-icon { width: 44px; height: 44px; border-radius: 10px; background: var(--green-soft); display: flex; align-items: center; justify-content: center; margin-bottom: 14px; }
.card-icon svg { width: 22px; height: 22px; stroke: var(--green); }

/* ---------------- 计算器 ---------------- */
.calc-wrap { max-width: 860px; margin: 0 auto; padding: 48px 20px 72px; }
.calc-head { text-align: center; margin-bottom: 34px; }
.calc-head h1 { font-size: 32px; }
.calc-head p { color: var(--text-soft); max-width: 640px; margin: 0 auto; }
.calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; align-items: start; }
.calc-panel { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 26px; box-shadow: var(--shadow); }
.calc-panel h2 { font-size: 18px; margin-bottom: 16px; padding-bottom: 10px; border-bottom: 1px solid var(--border); }
.field { margin-bottom: 15px; }
.field label { display: block; font-size: 13.5px; font-weight: 600; color: var(--text); margin-bottom: 6px; }
.field .hint { font-size: 12px; color: var(--text-soft); font-weight: 400; margin-left: 6px; }
.field input, .field select, .field textarea {
  width: 100%;
  padding: 10px 13px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font: inherit;
  font-size: 15px;
  background: #fff;
  color: var(--text);
  transition: border-color .15s, box-shadow .15s;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none;
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(26,127,55,.12);
}
.field .error-text { color: var(--danger); font-size: 12.5px; margin-top: 4px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.input-group { display: flex; align-items: stretch; }
.input-group input { border-radius: 8px 0 0 8px; }
.input-group .suffix {
  background: #f0f2f5; border: 1px solid var(--border); border-left: 0;
  border-radius: 0 8px 8px 0; padding: 0 14px; display: flex; align-items: center;
  font-size: 13px; color: var(--text-soft); white-space: nowrap;
}

.result-box {
  margin-top: 18px;
  background: var(--green-deep);
  color: #fff;
  border-radius: 12px;
  padding: 22px;
  text-align: center;
}
.result-box .result-label { font-size: 13px; text-transform: uppercase; letter-spacing: 1px; color: #a9c8b2; }
.result-box .result-value { font-size: 42px; font-weight: 800; line-height: 1.2; color: #fff; }
.result-box .result-sub { font-size: 13px; color: #cfe6d6; margin-top: 6px; }
.result-box.dim { opacity: .45; }

.formula-note {
  margin-top: 26px;
  background: var(--green-soft);
  border-left: 4px solid var(--green);
  border-radius: 0 10px 10px 0;
  padding: 16px 18px;
  font-size: 14px;
}
.formula-note code { background: rgba(26,127,55,.1); color: var(--green-dark); }

/* 多轮输入（差点指数计算器） */
.rounds-list { display: flex; flex-direction: column; gap: 10px; margin-bottom: 14px; }
.round-row { display: grid; grid-template-columns: 1.2fr .8fr .9fr .8fr .8fr; gap: 8px; align-items: center; }
.round-row input { padding: 8px 10px; font-size: 14px; }
.round-actions { display: flex; justify-content: space-between; align-items: center; margin-top: 8px; }
.diff-list { margin-top: 16px; }
.diff-row { display: flex; justify-content: space-between; padding: 7px 0; border-bottom: 1px dashed var(--border); font-size: 14px; }
.diff-row span:last-child { font-weight: 600; color: var(--green-dark); }

/* 快速工具条（计算器页之间互链） */
.toolbar-links { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; margin-top: 30px; }
.toolbar-links a { font-size: 13.5px; padding: 7px 14px; border: 1px solid var(--border); border-radius: 30px; background: #fff; color: var(--text-soft); }
.toolbar-links a:hover { border-color: var(--green); color: var(--green); text-decoration: none; }

/* ---------------- 文章页 ---------------- */
.article-wrap { max-width: 780px; margin: 0 auto; padding: 48px 20px 80px; }
.article-wrap h1 { font-size: 34px; margin-bottom: 14px; }
.article-wrap h2 { margin-top: 44px; font-size: 23px; }
.article-wrap h3 { margin-top: 30px; font-size: 18px; }
.article-meta { color: var(--text-soft); font-size: 13.5px; border-bottom: 1px solid var(--border); padding-bottom: 18px; margin-bottom: 26px; }
.article-body { font-size: 16px; }
.article-body .formula-box {
  background: #1f2430; color: #e6e6e6; border-radius: 8px; padding: 16px 18px;
  font-family: "SFMono-Regular", Consolas, monospace; font-size: 14px; overflow-x: auto; margin: 18px 0;
}
.article-body .answer-box { background: var(--green-soft); border-left: 4px solid var(--green); border-radius: 0 8px 8px 0; padding: 14px 18px; margin: 18px 0; font-size: 15.5px; }
.faq-item { border: 1px solid var(--border); border-radius: 10px; padding: 18px 20px; margin-bottom: 14px; background: #fff; }
.faq-item h3 { margin-bottom: 8px; font-size: 16px; }
.cta-box {
  margin-top: 40px; background: linear-gradient(135deg, var(--green-deep), var(--green-dark));
  color: #fff; border-radius: 14px; padding: 30px; text-align: center;
}
.cta-box h3 { color: #fff; margin-bottom: 8px; }
.cta-box p { color: #cfe6d6; margin-bottom: 18px; }
.cta-box .btn-primary { background: #fff; color: var(--green-deep); }
.cta-box .btn-primary:hover { background: #eaf5ec; }
table.simple-table { width: 100%; border-collapse: collapse; margin: 18px 0; font-size: 14px; background: #fff; }
table.simple-table th, table.simple-table td { border: 1px solid var(--border); padding: 9px 13px; text-align: left; }
table.simple-table th { background: #f0f2f5; font-weight: 600; }

/* ---------------- 定价 ---------------- */
.pricing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; align-items: stretch; }
.price-card { background: #fff; border: 1px solid var(--border); border-radius: 14px; padding: 30px; display: flex; flex-direction: column; box-shadow: var(--shadow); }
.price-card.featured { border: 2px solid var(--green); position: relative; }
.price-card .badge { position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: var(--green); color: #fff; font-size: 12px; font-weight: 700; padding: 3px 14px; border-radius: 20px; }
.price-card h3 { font-size: 20px; margin-bottom: 4px; }
.price-card .price { font-size: 38px; font-weight: 800; color: var(--text); margin: 8px 0 2px; }
.price-card .price-period { color: var(--text-soft); font-size: 13.5px; margin-bottom: 18px; }
.price-card ul { list-style: none; padding: 0; margin: 0 0 22px; flex: 1; }
.price-card ul li { padding: 7px 0 7px 26px; position: relative; font-size: 14.5px; color: var(--text); }
.price-card ul li::before { content: "✓"; position: absolute; left: 0; color: var(--green); font-weight: 700; }

/* ---------------- 认证页 ---------------- */
.auth-wrap { max-width: 440px; margin: 0 auto; padding: 56px 20px 80px; }
.auth-card { background: #fff; border: 1px solid var(--border); border-radius: 14px; padding: 34px; box-shadow: var(--shadow); }
.auth-card h1 { font-size: 24px; text-align: center; margin-bottom: 6px; }
.auth-card .auth-sub { text-align: center; color: var(--text-soft); font-size: 14px; margin-bottom: 24px; }
.auth-alt { text-align: center; font-size: 14px; margin-top: 20px; color: var(--text-soft); }
.code-input { letter-spacing: 10px; font-size: 26px !important; text-align: center; font-weight: 700; }
.dev-code { background: var(--warn-soft); border: 1px dashed #e6c34a; color: var(--warn); border-radius: 8px; padding: 10px 14px; font-size: 13.5px; margin-bottom: 16px; }

/* ---------------- 仪表盘 ---------------- */
.dash-wrap { max-width: 1000px; margin: 0 auto; padding: 40px 20px 80px; }
.dash-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 22px; align-items: start; }
.dash-stat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-bottom: 24px; }
.stat-card { background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 20px; box-shadow: var(--shadow); }
.stat-card .stat-label { font-size: 12.5px; text-transform: uppercase; letter-spacing: .8px; color: var(--text-soft); }
.stat-card .stat-value { font-size: 30px; font-weight: 800; color: var(--green-dark); margin-top: 4px; }
.stat-card .stat-sub { font-size: 12.5px; color: var(--text-soft); }
.table { width: 100%; border-collapse: collapse; background: #fff; border: 1px solid var(--border); border-radius: 10px; overflow: hidden; font-size: 14px; }
.table th, .table td { padding: 11px 14px; text-align: left; border-bottom: 1px solid var(--border); }
.table th { background: #f0f2f5; font-weight: 600; font-size: 13px; }
.table tr:last-child td { border-bottom: 0; }
.table .actions { display: flex; gap: 8px; }
.table .actions a, .table .actions button { font-size: 13px; padding: 4px 10px; border-radius: 6px; border: 1px solid var(--border); background: #fff; color: var(--text-soft); cursor: pointer; font-family: var(--font); }
.table .actions a:hover, .table .actions button:hover { border-color: var(--green); color: var(--green); }
.table .actions .delete:hover { border-color: var(--danger); color: var(--danger); }

.trend-chart { width: 100%; }
.chart-empty { text-align: center; color: var(--text-soft); padding: 40px 0; font-size: 14px; }

/* ---------------- 页脚 ---------------- */
.site-footer { background: var(--green-deep); color: #cfe6d6; margin-top: 40px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 32px; padding: 48px 20px 32px; }
.footer-grid h4 { color: #fff; font-size: 14px; margin-bottom: 14px; }
.footer-grid a { display: block; color: #a9c8b2; font-size: 14px; padding: 4px 0; }
.footer-grid a:hover { color: #fff; }
.footer-brand p { color: #a9c8b2; font-size: 13.5px; margin-top: 12px; max-width: 300px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); padding: 16px 20px; display: flex; justify-content: space-between; font-size: 13px; color: #8fae98; flex-wrap: wrap; gap: 8px; }

/* ---------------- 响应式 ---------------- */
@media (max-width: 900px) {
  .hero .container { grid-template-columns: 1fr; gap: 32px; }
  .hero { padding: 52px 0 64px; }
  .hero h1 { font-size: 31px; }
  .grid-3, .grid-4 { grid-template-columns: 1fr 1fr; }
  .pricing-grid { grid-template-columns: 1fr; max-width: 460px; margin: 0 auto; }
  .calc-grid, .dash-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .dash-stat-grid { grid-template-columns: 1fr; }

  .nav-toggle { display: block; }
  .site-nav {
    display: none;
    position: absolute;
    top: 62px; left: 0; right: 0;
    background: var(--green-deep);
    flex-direction: column;
    align-items: stretch;
    padding: 12px 20px 20px;
    gap: 2px;
    border-top: 1px solid rgba(255,255,255,.1);
  }
  .site-nav.open { display: flex; }
  .nav-link { width: 100%; justify-content: space-between; padding: 12px 8px; }
  .dropdown { position: static; opacity: 1; visibility: visible; transform: none; box-shadow: none; background: rgba(0,0,0,.28); border: 0; margin: 2px 0 8px 8px; display: none; }
  .dropdown a { color: #dcebe1; }
  .dropdown a:hover { background: rgba(255,255,255,.1); color: #fff; }
  .nav-item.open .dropdown { display: block; }
  .nav-auth { margin: 10px 0 0; gap: 10px; flex-wrap: wrap; }
}
@media (max-width: 560px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .field-row { grid-template-columns: 1fr; }
  .round-row { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  h1 { font-size: 26px; }
  .article-wrap h1 { font-size: 27px; }
}