/* ============================================================
   TIKARO · 站点样式系统
   配色方案 A《工程蓝灰 + 琥珀》· 英文为主 · 移动端优先
   ============================================================ */

:root {
  --ink: #16324F;        /* 主色 */
  --ink-soft: #1F4066;
  --steel: #3E6B8C;      /* 辅助色 */
  --amber: #F2A03D;      /* 强调色 · 仅用于主按钮与关键数字，占比 <10% */
  --amber-dark: #D98A28;

  --n50: #FFFFFF;
  --n100: #F5F6F7;
  --n200: #E3E6E8;
  --n400: #9AA1A9;
  --n700: #4A5058;
  --n900: #1A1D21;

  --wa: #1F9E6B;         /* WhatsApp 语义色，不改 */
  --err: #C4453B;

  --radius: 8px;
  --shadow: 0 1px 2px rgba(22, 50, 79, .06), 0 8px 24px rgba(22, 50, 79, .06);
  --maxw: 1200px;

  --font: "Inter", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --font-cond: "Barlow Condensed", "Inter", "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  color: var(--n700);
  background: var(--n50);
}

h1, h2, h3, h4 { color: var(--n900); margin: 0 0 .5em; line-height: 1.2; }
h1 { font-size: 44px; font-weight: 700; letter-spacing: -.01em; }
h2 { font-size: 32px; font-weight: 600; }
h3 { font-size: 20px; font-weight: 600; }
p  { margin: 0 0 1em; }
a  { color: var(--steel); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.section { padding: 96px 0; }
.section--tight { padding: 56px 0; }
.section--alt { background: var(--n100); }
.section--ink { background: var(--ink); color: #fff; }
.section--ink h2, .section--ink h3 { color: #fff; }
.section--ink a { color: #fff; }

.eyebrow {
  font-size: 13px; font-weight: 600; letter-spacing: .14em;
  text-transform: uppercase; color: var(--steel); margin-bottom: 12px;
}
.lead { font-size: 18px; color: var(--n700); }
.muted { color: var(--n400); font-size: 13px; }
.center { text-align: center; }
.mt24 { margin-top: 24px; }
.mt40 { margin-top: 40px; }

/* ---------- 品牌标（Logo 方向 1《导轨与砖》的 SVG 复刻） ---------- */
.brand { display: inline-flex; align-items: center; gap: 12px; }
.brand svg { display: block; }
.brand-text { display: flex; flex-direction: column; line-height: 1; }
.brand-name {
  font-family: var(--font-cond); font-size: 22px; font-weight: 700;
  letter-spacing: .04em; color: inherit;
}
.brand-sub {
  font-size: 8.5px; font-weight: 600; letter-spacing: .18em;
  color: inherit; opacity: .68; margin-top: 3px;
}

/* ---------- 顶部导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: var(--ink); color: #fff;
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 0 24px;
  height: 72px; display: flex; align-items: center; gap: 32px;
}
.nav-links { display: flex; gap: 26px; margin-left: 8px; font-size: 15px; }
.nav-links a { color: rgba(255,255,255,.86); }
.nav-links a.is-active { color: #fff; box-shadow: inset 0 -2px 0 var(--amber); }
.nav-actions { margin-left: auto; display: flex; align-items: center; gap: 12px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 48px; padding: 0 24px; border-radius: var(--radius);
  font-size: 15px; font-weight: 600; cursor: pointer; border: 1px solid transparent;
  white-space: nowrap;
}
.btn--primary { background: var(--amber); color: var(--n900); }
.btn--primary:hover { background: var(--amber-dark); text-decoration: none; }
.btn--ghost { background: transparent; color: var(--ink); border-color: var(--ink); }
.btn--ghost-inv { background: transparent; color: #fff; border-color: rgba(255,255,255,.55); }
.btn--wa { background: var(--wa); color: #fff; }
.btn--wa:hover { background: #17875a; text-decoration: none; }
.btn--block { width: 100%; }
.btn--sm { height: 40px; padding: 0 16px; font-size: 14px; }

/* ---------- Hero ---------- */
.hero { background: var(--ink); color: #fff; padding: 88px 0 72px; }
.hero h1 { color: #fff; max-width: 15em; }
.hero .lead { color: rgba(255,255,255,.82); max-width: 34em; }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.hero-points { display: flex; gap: 20px; flex-wrap: wrap; margin-top: 28px; font-size: 13px; color: rgba(255,255,255,.72); }
.hero-points span::before { content: "—  "; color: var(--amber); }

/* ---------- 照片占位（等实拍素材） ---------- */
.photo {
  border: 1.5px dashed var(--n400); border-radius: 12px;
  background:
    repeating-linear-gradient(45deg, rgba(154,161,169,.08) 0 10px, transparent 10px 20px);
  display: flex; align-items: center; justify-content: center; text-align: center;
  color: var(--n400); font-size: 13px; padding: 24px; min-height: 220px;
}
.photo--hero { min-height: 320px; background-color: rgba(255,255,255,.06); border-color: rgba(255,255,255,.35); color: rgba(255,255,255,.7); }
.photo--wide { aspect-ratio: 4 / 3; }
.photo strong { display: block; color: var(--n700); font-size: 13px; margin-bottom: 4px; }
.photo--hero strong { color: #fff; }

/* ---------- 信任条 ---------- */
.trust { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.trust-item { text-align: center; }
.trust-num { font-family: var(--font-cond); font-size: 44px; font-weight: 700; color: var(--ink); line-height: 1; }
.trust-cap { font-size: 13px; color: var(--n400); margin-top: 8px; }

/* ---------- 卡片网格 ---------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 40px; align-items: center; }

.card {
  background: var(--n50); border: 1px solid var(--n200); border-radius: 12px;
  overflow: hidden; display: flex; flex-direction: column;
}
.card:hover { box-shadow: var(--shadow); }
.card-body { padding: 20px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.card-model { font-family: var(--font-cond); font-size: 24px; font-weight: 700; color: var(--n900); letter-spacing: .02em; }
.card-tag { font-size: 13px; color: var(--n700); }
.card-specs { border-top: 1px solid var(--n200); margin-top: auto; padding-top: 12px; }
.card-specs div { display: flex; justify-content: space-between; font-size: 13px; padding: 3px 0; }
.card-specs span:last-child { font-family: var(--font-cond); font-size: 15px; color: var(--n900); }
.card-link { font-size: 14px; font-weight: 600; color: var(--steel); margin-top: 8px; }

/* ---------- 规格表 ---------- */
.spec-table { width: 100%; border-collapse: collapse; font-size: 15px; background: var(--n50); }
.spec-table th, .spec-table td { padding: 12px 14px; border-bottom: 1px solid var(--n200); text-align: left; }
.spec-table thead th { background: var(--n100); color: var(--n900); font-weight: 600; font-size: 14px; }
.spec-table td.num { font-family: var(--font-cond); font-size: 17px; color: var(--n900); }
.spec-table td:first-child { color: var(--n700); }

/* ---------- 表单 ---------- */
.form { background: var(--n50); border: 1px solid var(--n200); border-radius: 12px; padding: 32px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field--full { grid-column: 1 / -1; }
.field label { font-size: 13px; font-weight: 600; color: var(--n900); }
.field input, .field select {
  height: 48px; border: 1px solid var(--n200); border-radius: var(--radius);
  padding: 0 14px; font-size: 15px; font-family: inherit; color: var(--n700); background: var(--n50);
}
.field input:focus, .field select:focus { outline: 2px solid var(--steel); outline-offset: 1px; }
.form-note { font-size: 13px; color: var(--n400); margin-top: 12px; }

/* ---------- 移动端底部常驻条 ---------- */
.mobile-bar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 60;
  display: none; gap: 10px; padding: 10px 14px;
  background: rgba(255,255,255,.97); border-top: 1px solid var(--n200);
}
.mobile-bar .btn { flex: 1; }

/* ---------- 页脚 ---------- */
.footer { background: var(--n900); color: rgba(255,255,255,.72); padding: 56px 0 32px; font-size: 14px; }
.footer h4 { color: #fff; font-size: 14px; letter-spacing: .08em; text-transform: uppercase; margin-bottom: 14px; }
.footer a { color: rgba(255,255,255,.72); }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 32px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.14); margin-top: 40px; padding-top: 20px; font-size: 12.5px; color: rgba(255,255,255,.5); display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

/* ---------- 流程四步 ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.step { padding: 20px; border: 1px solid var(--n200); border-radius: 12px; background: var(--n50); }
.step-n { font-family: var(--font-cond); font-size: 28px; font-weight: 700; color: var(--amber); line-height: 1; }
.step h3 { margin: 10px 0 6px; font-size: 17px; }
.step p { font-size: 14px; margin: 0; }

/* ---------- FAQ ---------- */
.faq-item { border-bottom: 1px solid var(--n200); padding: 18px 0; }
.faq-item h3 { font-size: 17px; margin-bottom: 6px; }
.faq-item p { margin: 0; font-size: 15px; }

/* ---------- 分级表 ---------- */
.tier-table { width: 100%; border-collapse: collapse; font-size: 15px; }
.tier-table th { background: var(--ink); color: #fff; text-align: left; padding: 14px; font-size: 14px; font-weight: 600; }
.tier-table td { padding: 14px; border-bottom: 1px solid var(--n200); }
.tier-table tr:nth-child(even) td { background: var(--n100); }

/* ============================================================
   社媒卡片（1080 × 1080）
   ============================================================ */
.card-stage { display: flex; flex-wrap: wrap; gap: 32px; padding: 32px; background: var(--n200); }
.scard {
  width: 540px; height: 540px;   /* 1080×1080 的 0.5 预览比例 */
  background: var(--n50); border-radius: 12px; overflow: hidden;
  display: flex; flex-direction: column; font-family: var(--font);
}
.scard--ink { background: var(--ink); color: #fff; }
.scard--alt { background: var(--n100); }
.scard-head { padding: 30px 34px 0; }
.scard-body { padding: 0 34px; flex: 1; display: flex; flex-direction: column; justify-content: center; }
.scard-foot {
  padding: 22px 34px; border-top: 1px solid var(--n200);
  display: flex; align-items: center; justify-content: space-between;
  font-size: 13px; color: var(--n400);
}
.scard--ink .scard-foot { border-color: rgba(255,255,255,.18); color: rgba(255,255,255,.6); }
.scard-model { font-family: var(--font-cond); font-size: 54px; font-weight: 700; color: var(--n900); line-height: 1; }
.scard--ink .scard-model { color: #fff; }
.scard-h { font-size: 34px; font-weight: 700; color: var(--n900); line-height: 1.25; margin-bottom: 14px; }
.scard--ink .scard-h { color: #fff; }
.scard-p { font-size: 19px; color: var(--n700); line-height: 1.5; }
.scard--ink .scard-p { color: rgba(255,255,255,.85); }
.scard-q { font-size: 13px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--steel); margin-bottom: 10px; }
.scard-big { font-family: var(--font-cond); font-size: 116px; font-weight: 700; color: var(--amber); line-height: .9; }
.scard-specs { display: flex; flex-direction: column; gap: 8px; }
.scard-specs div { display: flex; justify-content: space-between; border-top: 1px solid var(--n200); padding-top: 8px; font-size: 19px; }
.scard-specs span:last-child { font-family: var(--font-cond); font-size: 22px; color: var(--n900); }
.scard--ink .scard-specs div { border-color: rgba(255,255,255,.2); }
.scard--ink .scard-specs span:last-child { color: #fff; }
.scard-cmp { width: 100%; border-collapse: collapse; font-size: 18px; }
.scard-cmp th { text-align: left; padding: 12px 10px; font-family: var(--font-cond); font-size: 22px; color: var(--n900); }
.scard-cmp td { padding: 10px; border-top: 1px solid var(--n200); }
.scard-cmp tr:nth-child(even) td { background: var(--n100); }
.scard-cta { background: var(--amber); color: var(--n900); font-weight: 700; font-size: 21px; padding: 18px 34px; text-align: center; }
.scard-photo { flex: 1; margin: 0; border-bottom: 1px solid var(--n200); }
.vcard { width: 640px; height: 360px; background: var(--ink); color: #fff; border-radius: 12px; display: flex; flex-direction: column; justify-content: center; align-items: center; text-align: center; padding: 40px; font-family: var(--font); }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 900px) {
  h1 { font-size: 30px; }
  h2 { font-size: 23px; }
  .section { padding: 56px 0; }
  .nav-links { display: none; }
  .hero { padding: 56px 0 44px; }
  .hero-grid, .grid-2, .grid-3, .steps, .form-grid, .footer-grid { grid-template-columns: 1fr; }
  .trust { grid-template-columns: repeat(3, 1fr); gap: 12px; }
  .trust-num { font-size: 30px; }
  .mobile-bar { display: flex; }
  body { padding-bottom: 76px; }
  .footer-bottom { flex-direction: column; }
}