/* ============================================================
   CORE — Design Tokens & Reset
   拓跋云 V4 · 红金配色
   ============================================================ */

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

:root {
  /* Red */
  --red-50:#fef2f2;--red-100:#fee2e2;--red-200:#fecaca;--red-300:#fca5a5;
  --red-400:#f87171;--red-500:#c00000;--red-600:#a00000;--red-700:#800000;--red-800:#5c0000;
  /* Gold */
  --gold-50:#fffbeb;--gold-100:#fef3c7;--gold-200:#fde68a;--gold-300:#fcd34d;--gold-400:#fbbf24;--gold-500:#c9951e;
  /* Gray */
  --gray-50:#fafafa;--gray-100:#f5f5f5;--gray-200:#e5e5e5;--gray-300:#d4d4d4;
  --gray-400:#a3a3a3;--gray-500:#737373;--gray-600:#525252;--gray-700:#404040;--gray-800:#262626;--gray-900:#171717;
  /* BG */
  --bg-white:#fff;--bg-gray:#E6E1D8;--bg-gray-alt:#f5f3ee;--bg-card:#fff;--bg-card-hover:#fef2f2;
  /* Text */
  --text-primary:#1a1a1a;--text-secondary:#595959;--text-tertiary:#8c8c8c;--text-on-brand:#fff;
  /* Border */
  --border-light:#e8e5df;--border-mid:#d9d5cc;--border-red:rgba(192,0,0,0.12);
  /* Shadow */
  --shadow-card:0 2px 12px rgba(0,0,0,0.05);--shadow-hover:0 12px 40px rgba(0,0,0,0.08);
  --shadow-lg:0 20px 60px rgba(0,0,0,0.10);--shadow-red:0 4px 20px rgba(192,0,0,0.12);
  /* Font */
  --font-sans:'PingFang SC','Microsoft YaHei','Noto Sans SC',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --font-en:'Inter','Helvetica Neue',Arial,sans-serif;
  /* Space */
  --space-1:4px;--space-2:8px;--space-3:12px;--space-4:16px;--space-5:20px;--space-6:24px;
  --space-8:32px;--space-10:40px;--space-12:48px;--space-16:64px;--space-20:80px;--space-24:96px;
  /* Radius */
  --radius-sm:4px;--radius-md:6px;--radius-lg:12px;--radius-xl:16px;
  /* Transition */
  --ease-out:cubic-bezier(0.16,1,0.3,1);--transition-fast:250ms var(--ease-out);--transition-base:400ms var(--ease-out);
  /* Layout */
  --container-max:1200px;--container-narrow:900px;--nav-height:84px;
}

html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased}
body{font-family:var(--font-sans);color:var(--text-primary);background:var(--bg-white);line-height:1.7;overflow-x:hidden;font-size:15px}
a{text-decoration:none;color:inherit}
a,button,.btn,input,select,textarea{touch-action:manipulation}
img{max-width:100%;height:auto;display:block}
::selection{background:rgba(192,0,0,0.15);color:var(--red-500)}

h1{font-size:clamp(28px,4vw,48px);font-weight:700;line-height:1.15;letter-spacing:-.3px}
h2{font-size:clamp(24px,3.2vw,36px);font-weight:700;line-height:1.2;letter-spacing:-.2px}
h3{font-size:clamp(18px,2.2vw,24px);font-weight:600;line-height:1.3}
h4{font-size:18px;font-weight:600}

.container{max-width:var(--container-max);margin:0 auto;padding:0 20px}
.container-narrow{max-width:var(--container-narrow);margin:0 auto;padding:0 20px}
@media(min-width:768px){.container,.container-narrow{padding:0 32px}}

.section{padding:60px 0;position:relative}
@media(min-width:1024px){.section{padding:80px 0}}
.section-gray{background:#F5F2ED!important}
.section-white{background:var(--bg-white)}

.section-label{display:inline-flex;flex-direction:column;align-items:flex-start;gap:2px;margin-bottom:var(--space-4)}
.section-label .cn{font-size:13px;font-weight:600;color:var(--red-500);letter-spacing:4px;line-height:1.2;text-transform:uppercase}
.section-label .en{font-size:11px;font-weight:500;color:var(--red-500);letter-spacing:4px;text-transform:uppercase;font-family:var(--font-en);opacity:.7}
.section-label .bar{width:28px;height:2px;background:var(--gold-500);margin-top:6px}
.section-header{max-width:640px;margin-bottom:40px}
.section-header.centered{text-align:center;margin:0 auto 40px}
.section-header.centered .section-label{align-items:center}
.section-title{font-size:clamp(26px,3.6vw,40px);font-weight:700;line-height:1.15;color:var(--text-primary);margin-bottom:var(--space-3);letter-spacing:-.3px}
.section-title .red{color:var(--red-500)}
.section-title .gold{color:var(--gold-500)}
.section-title .light{font-weight:300}
.section-desc{font-size:15px;color:var(--text-secondary);line-height:1.9;letter-spacing:.3px}

.text-red{color:var(--red-500)}.text-gold{color:var(--gold-500)}.text-center{text-align:center}.text-muted{color:var(--text-secondary)}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}