/* ============================================================
   DESIGN SYSTEM — "KAMI PAPER / EDITORIAL WARM"
   Style: Warm editorial light, offset-shadow cards, oversized
   numeral typography, persimmon + pine accent pairing.
   ============================================================ */

:root {
  --paper:      #FBF7F2;
  --paper-2:    #F3EDE4;
  --paper-3:    #FFFDFA;
  --ink:        #1E2A26;
  --ink-soft:   #5B6B65;
  --line:       #E7DFD3;
  --pine:       #0E4F45;
  --pine-lite:  #17705F;
  --persimmon:  #FF5A36;
  --lime:       #D9F26B;
  --radius:     18px;
  --radius-sm:  12px;
  --shadow-soft: 0 2px 0 rgba(30,42,38,.06), 0 14px 34px -18px rgba(30,42,38,.28);
  --shadow-pop:  0 4px 0 rgba(30,42,38,.10), 0 22px 44px -20px rgba(30,42,38,.35);
  --ease: cubic-bezier(.22,.61,.36,1);
}

/* ============================================================
   基础重置
   ============================================================ */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }

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

body {
  font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  overflow-x:hidden;
  background:var(--paper);
  color:var(--ink);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

::selection { background:var(--lime); color:var(--pine); }

img { max-width:100%; display:block; }

a { color:inherit; }

h1, h2, h3, h4 {
  font-weight:900;
  line-height:1.14;
  letter-spacing:-0.025em;
}

/* ============================================================
   核心布局 — 必须居中
   ============================================================ */
.container { max-width:1200px; margin:0 auto; padding:0 24px; }

.section {
  padding:80px 0;
  position:relative;
}

.section:nth-child(even) { background:#f8f9fa; }

/* 章节之间的细分隔线，营造杂志感 */
.section + .section { border-top:1px solid var(--line); }

/* ============================================================
   导航 — 固定顶部
   ============================================================ */
.site-header {
  position:fixed;
  top:0; left:0; width:100%;
  z-index:1000;
  background:rgba(255,255,255,0.95);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  border-bottom:1px solid #eee;
  transition:background .35s var(--ease), box-shadow .35s var(--ease);
}

.site-header::after {
  content:"";
  position:absolute;
  left:0; bottom:-1px;
  height:2px; width:100%;
  background:linear-gradient(
    90deg,
    var(--pine)    0%,
    var(--pine)    38%,
    var(--persimmon) 38%,
    var(--persimmon) 66%,
    var(--lime)    66%,
    var(--lime)    100%
  );
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .5s var(--ease);
}

.site-header:hover::after { transform:scaleX(1); }

.header-inner {
  display:flex;
  align-items:center;
  justify-content:space-between;
  height:68px;
  max-width:1200px;
  margin:0 auto;
  padding:0 24px;
}

.logo {
  display:flex;
  align-items:center;
  gap:8px;
  font-weight:700;
  font-size:1.2rem;
  text-decoration:none;
  color:inherit;
  letter-spacing:-0.02em;
}

.logo-icon {
  width:36px; height:36px;
  border-radius:8px;
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:1rem;
  font-weight:900;
  background:var(--pine);
  color:var(--lime);
  box-shadow:0 3px 0 rgba(14,79,69,.22);
  transition:transform .35s var(--ease), border-radius .35s var(--ease);
}

.logo:hover .logo-icon {
  transform:rotate(-8deg) scale(1.06);
  border-radius:14px;
}

.main-nav {
  display:flex;
  align-items:center;
  gap:24px;
  list-style:none;
}

.main-nav a {
  text-decoration:none;
  font-size:0.9rem;
  font-weight:500;
  transition:0.2s;
  position:relative;
  padding:4px 0;
  color:var(--ink);
}

.main-nav a::after {
  content:"";
  position:absolute;
  left:0; bottom:0;
  width:100%; height:2px;
  background:var(--persimmon);
  border-radius:2px;
  transform:scaleX(0);
  transform-origin:right;
  transition:transform .32s var(--ease);
}

.main-nav a:hover { color:var(--pine); }
.main-nav a:hover::after { transform:scaleX(1); transform-origin:left; }

.nav-cta {
  padding:8px 20px;
  border-radius:8px;
  color:#fff!important;
  font-weight:600;
  background:var(--persimmon);
  box-shadow:0 3px 0 rgba(255,90,54,.28);
  letter-spacing:.01em;
}

.nav-cta::after { display:none; }

.nav-cta:hover {
  transform:translateY(-2px);
  box-shadow:0 6px 0 rgba(255,90,54,.24), 0 12px 22px -12px rgba(255,90,54,.6);
}

.menu-toggle {
  display:none;
  width:40px; height:40px;
  border:1px solid var(--line);
  background:var(--paper-3);
  border-radius:10px;
  cursor:pointer;
  align-items:center;
  justify-content:center;
  color:var(--ink);
  font-size:1.1rem;
  transition:.25s var(--ease);
}

.menu-toggle:hover { border-color:var(--pine); color:var(--pine); }

/* ============================================================
   首页 Hero
   ============================================================ */
.hero {
  min-height:70vh;
  display:flex;
  align-items:center;
  position:relative;
  overflow:hidden;
  padding-top:110px;
  padding-bottom:70px;
  background:
    radial-gradient(760px 380px at 88% -8%, rgba(217,242,107,.55), transparent 62%),
    radial-gradient(620px 420px at 2% 108%, rgba(255,90,54,.12), transparent 60%),
    var(--paper);
}

/* 装饰性细网格 */
.hero::before {
  content:"";
  position:absolute;
  inset:0;
  background-image:
    linear-gradient(to right, rgba(30,42,38,.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(30,42,38,.05) 1px, transparent 1px);
  background-size:72px 72px;
  mask-image:radial-gradient(circle at 50% 40%, #000 10%, transparent 78%);
  -webkit-mask-image:radial-gradient(circle at 50% 40%, #000 10%, transparent 78%);
  pointer-events:none;
}

.hero .container { position:relative; z-index:1; }

.hero-content { max-width:720px; }

.hero-eyebrow {
  display:inline-block;
  font-size:0.85rem;
  font-weight:600;
  padding:4px 14px;
  border-radius:20px;
  margin-bottom:16px;
  background:var(--lime);
  color:var(--pine);
  letter-spacing:.14em;
  text-transform:uppercase;
  box-shadow:0 3px 0 rgba(14,79,69,.18);
}

.hero h1 {
  font-size:clamp(2.35rem, 5.8vw, 3.9rem);
  line-height:1.2;
  margin-bottom:20px;
  letter-spacing:-0.035em;
}

.hero h1 em {
  font-style:normal;
  color:var(--persimmon);
  position:relative;
  white-space:nowrap;
}

.hero h1 em::after {
  content:"";
  position:absolute;
  left:0; right:0; bottom:.08em;
  height:.14em;
  background:var(--lime);
  border-radius:4px;
  z-index:-1;
}

.hero p {
  font-size:1.1rem;
  opacity:0.7;
  max-width:560px;
  margin-bottom:32px;
}

.hero-buttons {
  display:flex;
  gap:14px;
  flex-wrap:wrap;
  margin-bottom:48px;
}

.hero-image {
  border-radius:var(--radius);
  overflow:hidden;
  border:1px solid var(--line);
  box-shadow:var(--shadow-pop);
  background:var(--paper-3);
}

.hero-image img {
  width:100%;
  height:auto;
  transition:transform .7s var(--ease);
}

.hero-image:hover img { transform:scale(1.03); }

/* ============================================================
   按钮
   ============================================================ */
.btn {
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:12px 28px;
  border-radius:8px;
  font-weight:600;
  cursor:pointer;
  border:none;
  text-decoration:none;
  transition:0.2s;
  font-size:.95rem;
  font-family:inherit;
  letter-spacing:.01em;
  will-change:transform;
}

.btn-primary {
  color:#fff;
  background:var(--pine);
  box-shadow:0 4px 0 rgba(14,79,69,.32);
}

.btn-primary:hover {
  background:var(--pine-lite);
  transform:translateY(-2px);
  box-shadow:0 7px 0 rgba(14,79,69,.26), 0 16px 28px -14px rgba(14,79,69,.65);
}

.btn-primary:active { transform:translateY(2px); box-shadow:0 1px 0 rgba(14,79,69,.3); }

.btn-outline {
  background:transparent;
  border:1.5px solid;
  border-color:var(--ink);
  color:var(--ink);
}

.btn-outline:hover {
  background:var(--ink);
  color:var(--paper);
  transform:translateY(-2px);
  box-shadow:0 6px 0 rgba(30,42,38,.18);
}

/* ============================================================
   标签 / 标题
   ============================================================ */
.section-label {
  display:inline-block;
  font-size:0.8rem;
  font-weight:600;
  letter-spacing:2px;
  margin-bottom:12px;
  color:var(--persimmon);
  text-transform:uppercase;
  position:relative;
  padding-left:26px;
}

.section-label::before {
  content:"";
  position:absolute;
  left:0; top:50%;
  width:16px; height:2px;
  background:var(--persimmon);
  transform:translateY(-50%);
  border-radius:2px;
}

.section-title {
  font-size:clamp(1.7rem, 3.4vw, 2.4rem);
  margin-bottom:14px;
  letter-spacing:-0.035em;
}

.section-desc {
  max-width:600px;
  opacity:0.7;
  margin-bottom:40px;
  font-size:1rem;
}

.text-accent { color:var(--pine); }

/* ============================================================
   卡片网格
   ============================================================ */
.cards-grid {
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(260px,1fr));
  gap:24px;
}

.category-card {
  border-radius:var(--radius);
  padding:28px;
  border:1px solid #eee;
  transition:0.2s;
  background:var(--paper-3);
  position:relative;
  overflow:hidden;
  box-shadow:var(--shadow-soft);
}

.category-card::before {
  content:"";
  position:absolute;
  top:0; left:0;
  width:100%; height:3px;
  background:linear-gradient(90deg, var(--persimmon), var(--lime));
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .45s var(--ease);
}

.category-card:hover {
  transform:translateY(-3px);
  box-shadow:0 4px 16px rgba(0,0,0,0.1);
  border-color:transparent;
}

.category-card:hover::before { transform:scaleX(1); }

.card-icon {
  width:48px;
  height:48px;
  border-radius:10px;
  display:flex;
  align-items:center;
  justify-content:center;
  margin-bottom:16px;
  font-size:1.3rem;
  background:var(--paper-2);
  color:var(--pine);
  border:1px solid var(--line);
  transition:.35s var(--ease);
}

.category-card:hover .card-icon {
  background:var(--lime);
  border-color:transparent;
  transform:rotate(-6deg);
}

.category-card h3 {
  font-size:1.12rem;
  margin-bottom:8px;
  font-weight:800;
}

.category-card p {
  font-size:.9rem;
  color:var(--ink-soft);
  margin-bottom:16px;
}

.card-link {
  font-weight:600;
  font-size:0.85rem;
  text-decoration:none;
  color:var(--persimmon);
  display:inline-flex;
  align-items:center;
  gap:6px;
  letter-spacing:.02em;
}

.card-link::after {
  content:"→";
  transition:transform .3s var(--ease);
}

.card-link:hover::after { transform:translateX(5px); }

/* ============================================================
   特性块
   ============================================================ */
.feature-block {
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:56px;
  align-items:center;
}

.feature-image {
  border-radius:var(--radius);
  overflow:hidden;
  border:1px solid var(--line);
  box-shadow:var(--shadow-soft);
  position:relative;
}

.feature-image::after {
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(200deg, rgba(217,242,107,.22), transparent 55%);
  pointer-events:none;
}

.feature-image img {
  width:100%;
  height:auto;
  transition:transform .8s var(--ease);
}

.feature-image:hover img { transform:scale(1.04); }

.feature-text h3 {
  font-size:clamp(1.4rem, 2.6vw, 1.9rem);
  margin-bottom:14px;
}

.feature-text > p {
  color:var(--ink-soft);
  margin-bottom:20px;
}

.feature-list { list-style:none; }

.feature-list li {
  padding:6px 0;
  display:flex;
  align-items:center;
  gap:8px;
  font-size:.95rem;
}

.feature-list li::before {
  content:'✓';
  font-weight:700;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:20px; height:20px;
  flex:0 0 20px;
  border-radius:6px;
  background:var(--lime);
  color:var(--pine);
  font-size:.7rem;
}

/* ============================================================
   数据条
   ============================================================ */
.stats-bar {
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:24px;
  text-align:center;
}

.stat-item {
  padding:24px;
  border-radius:var(--radius);
  border:1px solid #eee;
  background:var(--paper-3);
  transition:.3s var(--ease);
  position:relative;
}

.stat-item:hover {
  transform:translateY(-3px);
  box-shadow:0 4px 16px rgba(0,0,0,0.08);
}

.stat-number {
  font-size:2.2rem;
  font-weight:800;
  letter-spacing:-0.04em;
  color:var(--pine);
  line-height:1.1;
  font-variant-numeric:tabular-nums;
}

.stat-item:nth-child(even) .stat-number { color:var(--persimmon); }

.stat-label {
  font-size:0.9rem;
  opacity:0.6;
  margin-top:6px;
  letter-spacing:.04em;
}

/* ============================================================
   内容墙
   ============================================================ */
.content-wall {
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(280px,1fr));
  gap:24px;
}

.content-wall-item {
  border-radius:var(--radius);
  overflow:hidden;
  border:1px solid #eee;
  transition:0.2s;
  background:var(--paper-3);
  box-shadow:var(--shadow-soft);
}

.content-wall-item:hover {
  transform:translateY(-3px);
  box-shadow:0 4px 16px rgba(0,0,0,0.12);
}

.content-wall-item img {
  width:100%;
  height:200px;
  object-fit:cover;
  transition:transform .8s var(--ease);
}

.content-wall-item:hover img { transform:scale(1.05); }

.content-wall-body { padding:20px; }

.content-wall-body h3 {
  font-size:1.05rem;
  font-weight:800;
  margin-bottom:8px;
}

.content-wall-body p {
  font-size:.88rem;
  color:var(--ink-soft);
}

/* ============================================================
   FAQ
   ============================================================ */
.faq-list {
  max-width:800px;
  margin:0 auto;
}

.faq-item {
  border:1px solid #eee;
  border-radius:10px;
  margin-bottom:8px;
  overflow:hidden;
  cursor:pointer;
  background:var(--paper-3);
  transition:.3s var(--ease);
}

.faq-item:hover { border-color:rgba(14,79,69,.35); }

.faq-item .faq-question {
  padding:16px 20px;
  font-weight:600;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:16px;
}

.faq-item .faq-question::after {
  content:"+";
  flex:0 0 auto;
  width:24px; height:24px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  border-radius:6px;
  background:var(--paper-2);
  color:var(--pine);
  font-weight:700;
  font-size:1rem;
  transition:.3s var(--ease);
}

.faq-item.open {
  border-color:var(--pine);
  box-shadow:var(--shadow-soft);
}

.faq-item.open .faq-question::after {
  content:"−";
  background:var(--lime);
  transform:rotate(180deg);
}

.faq-item .faq-answer {
  padding:0 20px 16px;
  display:none;
  opacity:0.7;
  font-size:.94rem;
}

.faq-item.open .faq-answer { display:block; }

/* ============================================================
   CTA 横幅
   ============================================================ */
.cta-banner {
  padding:56px 24px;
  text-align:center;
  border-radius:var(--radius);
  color:#fff;
  background:
    radial-gradient(520px 260px at 12% 0%, rgba(217,242,107,.30), transparent 62%),
    radial-gradient(520px 300px at 100% 120%, rgba(255,90,54,.45), transparent 60%),
    linear-gradient(120deg, var(--pine), var(--pine-lite));
  box-shadow:var(--shadow-pop);
  position:relative;
  overflow:hidden;
}

.cta-banner::before {
  content:"";
  position:absolute;
  inset:0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,.06) 1px, transparent 1px);
  background-size:44px 44px;
  pointer-events:none;
}

.cta-banner h2 {
  color:#fff;
  font-size:clamp(1.6rem, 3.4vw, 2.3rem);
  margin-bottom:12px;
  position:relative;
}

.cta-banner p {
  color:rgba(255,255,255,.78);
  max-width:560px;
  margin:0 auto 28px;
  position:relative;
}

.cta-banner .btn-primary {
  background:#fff;
  color:var(--pine);
  position:relative;
  box-shadow:0 4px 0 rgba(0,0,0,.16);
}

.cta-banner .btn-primary:hover {
  background:var(--lime);
  color:var(--pine);
  transform:translateY(-2px);
  box-shadow:0 8px 0 rgba(0,0,0,.14);
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  padding:56px 0 28px;
  background:var(--paper-2);
  border-top:1px solid var(--line);
}

.site-footer .container { }

.footer-grid {
  display:grid;
  grid-template-columns:2fr 1fr 1fr 1fr;
  gap:40px;
}

.footer-brand { }

.footer-brand .logo { margin-bottom:14px; }

.footer-brand p {
  font-size:.9rem;
  color:var(--ink-soft);
  max-width:320px;
}

.footer-col { }

.footer-col h4 {
  font-size:.82rem;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--pine);
  margin-bottom:16px;
  font-weight:800;
}

.footer-col ul { list-style:none; }

.footer-col li { margin-bottom:8px; }

.footer-col a {
  font-size:.9rem;
  text-decoration:none;
  color:var(--ink-soft);
  transition:.25s var(--ease);
  display:inline-block;
}

.footer-col a:hover {
  color:var(--persimmon);
  transform:translateX(4px);
}

.footer-bottom {
  border-top:1px solid rgba(30,42,38,.12);
  margin-top:40px;
  padding-top:20px;
  text-align:center;
  font-size:0.85rem;
  color:var(--ink-soft);
}

/* ============================================================
   工具类
   ============================================================ */
.text-accent { color:var(--persimmon); }
.text-center { text-align:center; }

.seo-description {
  max-width:600px;
  margin:0 auto 48px;
  opacity:0.7;
}

.mt-0 { margin-top:0; }
.mb-0 { margin-bottom:0; }

/* 分隔小符号 */
.section-divider {
  display:flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:8px 0;
}

.section-divider span {
  width:6px; height:6px;
  border-radius:50%;
  background:var(--persimmon);
  opacity:.5;
}

/* ============================================================
   ⚠️ 响应式
   ============================================================ */
@media (max-width: 768px) {
  .section { padding:64px 0; }

  .feature-block { grid-template-columns:1fr; }
  .feature-block > * { min-width:0; }

  .stats-bar { grid-template-columns:repeat(2,1fr); }

  .footer-grid { grid-template-columns:1fr 1fr; }

  .main-nav { display:none; }

  .menu-toggle { display:flex; }

  .main-nav.open {
    display:flex;
    flex-direction:column;
    position:absolute;
    top:68px;
    left:0;
    width:100%;
    background:#fff;
    padding:20px;
    gap:18px;
    border-bottom:1px solid var(--line);
    box-shadow:0 24px 40px -28px rgba(30,42,38,.45);
    animation:navDrop .32s var(--ease) both;
  }

  .main-nav.open li { width:100%; }

  .main-nav.open a { display:block; width:100%; }

  .main-nav.open .nav-cta { text-align:center; }

  .hero { padding-top:100px; min-height:auto; }

  .hero-buttons .btn { flex:1 1 auto; justify-content:center; }
}

@keyframes navDrop {
  from { opacity:0; transform:translateY(-10px); }
  to   { opacity:1; transform:translateY(0); }
}

@media (max-width: 480px) {
  .cards-grid,
  .content-wall,
  .stats-bar { grid-template-columns:1fr; }

  .footer-grid { grid-template-columns:1fr; }

  .hero-buttons { flex-direction:column; }

  .hero h1 { letter-spacing:-0.03em; }

  .cta-banner { padding:44px 20px; }
}