/* ===== CSS VARIABLES ===== */
:root {
  --layout-width: 1140px;
  --font: system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  --font-serif: 'Noto Serif SC', 'Source Han Serif SC', 'SimSun', serif;

  /* Light Mode Colors */
  --body-bg: radial-gradient(circle at top right, #ffddcc52, transparent 24%), linear-gradient(180deg, #fbfaf7 0%, #f6f3ee 100%);
  --bg-surface: rgba(255,255,255,0.95);
  --bg-card: #ffffff;
  --bg-card-hover: #ffffff;
  --bg-dark: #1a1a2e;
  --bg-darker: #0f0f1a;
  --bg-soft: #f3f4f6;
  --bg-nav: #ffffff;

  /* Text */
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --text-tertiary: #9ca3af;
  --text-light: #f0f0f0;

  /* Accent */
  --gold: #D4AF37;
  --gold-dark: #B8962E;
  --gold-light: rgba(212,175,55,0.12);
  --red: #C23B22;
  --red-light: #e85d4a;

  /* Surfaces */
  --border-color: #e5e7eb;
  --border-light: #f0f0f0;
  --shadow: 0 2px 12px rgba(0,0,0,0.06);
  --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
  --shadow-elevated: 0 20px 60px rgba(0,0,0,0.15);
  --radius: 12px;
  --radius-sm: 8px;

  /* Header */
  --header-bg: rgba(255,255,255,0.92);
  --header-border: #e5e7eb;

  /* Overlay */
  --overlay-bg: rgba(0,0,0,0.6);

  /* Transition */
  --transition: 0.3s cubic-bezier(0.22, 1, 0.36, 1);
  --transition-fast: 0.2s ease;
}

[data-theme="dark"] {
  --body-bg: radial-gradient(circle at top center, #6d95ff2e, transparent 28%), linear-gradient(180deg, #0a1017 0%, #0d141d 100%);
  --bg-surface: rgba(18,26,36,0.92);
  --bg-card: #131d27;
  --bg-card-hover: #182433;
  --bg-soft: #16202b;
  --bg-nav: #101923;

  --text-primary: #eef4fb;
  --text-secondary: #c7d1db;
  --text-tertiary: #92a1b1;
  --text-light: #eef4fb;

  --border-color: #b2c6db33;
  --border-light: rgba(255,255,255,0.06);
  --shadow: 0 2px 12px rgba(0,0,0,0.3);
  --shadow-hover: 0 8px 30px rgba(0,0,0,0.4);
  --shadow-elevated: 0 20px 60px rgba(0,0,0,0.5);
  --header-bg: rgba(8,12,18,0.85);
  --header-border: rgba(224,234,244,0.12);
  --overlay-bg: rgba(0,0,0,0.75);
}

/* ===== RESET ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font);
  background:var(--body-bg);
  color:var(--text-primary);
  line-height:1.6;
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
  transition:background var(--transition),color var(--transition);
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button{cursor:pointer;font-family:var(--font);border:none;background:none}
input,textarea{font-family:var(--font)}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar{width:8px;height:8px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:var(--text-tertiary);border-radius:4px}
::-webkit-scrollbar-thumb:hover{background:var(--text-secondary)}

/* ===== HEADER ===== */
.header{
  position:fixed;top:0;left:0;right:0;z-index:1000;
  background:var(--header-bg);
  backdrop-filter:blur(20px);
  -webkit-backdrop-filter:blur(20px);
  border-bottom:1px solid var(--header-border);
  height:64px;
  transition:background var(--transition),border-color var(--transition);
}
.header-inner{
  max-width:var(--layout-width);
  margin:0 auto;
  display:flex;
  align-items:center;
  justify-content:space-between;
  height:100%;
  padding:0 20px;
  gap:16px;
}
.logo{
  display:flex;align-items:center;gap:10px;
  cursor:pointer;flex-shrink:0;
}
.logo-avatar{
  width:36px;height:36px;border-radius:50%;
  background:linear-gradient(135deg,var(--bg-darker),var(--red));
  display:flex;align-items:center;justify-content:center;
  color:var(--gold);font-size:18px;font-weight:900;
  font-family:var(--font-serif);
  box-shadow:0 2px 8px rgba(194,59,34,0.3);
  transition:box-shadow var(--transition-fast);
}
.logo:hover .logo-avatar{box-shadow:0 4px 16px rgba(194,59,34,0.4)}
.logo-text{display:flex;flex-direction:column}
.logo-text strong{
  font-size:18px;font-weight:700;color:var(--text-primary);
  letter-spacing:1px;line-height:1.2;
  transition:color var(--transition);
}
.logo-text span{
  font-size:11px;color:var(--text-tertiary);
  letter-spacing:2px;
}
.header-right{
  display:flex;align-items:center;gap:12px;
  flex:1;justify-content:flex-end;
}
.search-box{position:relative;max-width:220px;width:100%}
.search-box input{
  width:100%;height:36px;padding:0 36px 0 14px;
  background:var(--bg-soft);border:1px solid var(--border-color);
  border-radius:18px;color:var(--text-primary);
  font-size:13px;outline:none;
  transition:var(--transition-fast);
}
.search-box input::placeholder{color:var(--text-tertiary)}
.search-box input:focus{
  border-color:var(--gold);
  box-shadow:0 0 0 3px var(--gold-light);
}
.search-box .search-icon{
  position:absolute;right:12px;top:50%;transform:translateY(-50%);
  font-size:14px;color:var(--text-tertiary);pointer-events:none;
}

/* ===== THEME TOGGLE ===== */
.theme-toggle{
  width:36px;height:36px;border-radius:50%;
  background:var(--bg-soft);border:1px solid var(--border-color);
  display:flex;align-items:center;justify-content:center;
  font-size:18px;cursor:pointer;
  transition:var(--transition-fast);
  flex-shrink:0;
}
.theme-toggle:hover{
  border-color:var(--gold);
  transform:rotate(15deg);
}

/* ===== NAV TABS ===== */
.nav-tabs-wrap{
  position:sticky;top:64px;z-index:999;
  background:var(--bg-nav);
  border-bottom:1px solid var(--border-color);
  padding:0 20px;overflow-x:auto;
  transition:background var(--transition),border-color var(--transition);
}
.nav-tabs{
  max-width:var(--layout-width);margin:0 auto;
  display:flex;gap:4px;
  scrollbar-width:none;
  -ms-overflow-style:none;
  height:48px;align-items:center;
}
.nav-tabs::-webkit-scrollbar{display:none}
.nav-tab{
  display:flex;align-items:center;gap:6px;
  padding:8px 14px;border-radius:8px;
  font-size:13px;font-weight:500;
  color:var(--text-secondary);
  cursor:pointer;transition:var(--transition-fast);
  white-space:nowrap;
  border:none;background:none;
}
.nav-tab:hover{background:var(--bg-soft);color:var(--text-primary)}
.nav-tab.active{
  background:var(--bg-darker);color:#fff;
  font-weight:600;
}
[data-theme="dark"] .nav-tab.active{
  background:var(--gold-dark);color:#fff;
}
.nav-tab .count{
  background:rgba(0,0,0,0.06);padding:1px 7px;
  border-radius:10px;font-size:11px;
}
.nav-tab.active .count{
  background:rgba(255,255,255,0.15);color:rgba(255,255,255,0.7);
}

/* ===== HERO BANNER ===== */
.hero{
  background:linear-gradient(135deg,var(--bg-darker) 0%,var(--bg-dark) 40%,#2a1a1a 100%);
  position:relative;overflow:hidden;
  padding:48px 20px 48px;
  transition:background var(--transition);
}
.hero::before{
  content:'';position:absolute;top:-50%;right:-20%;
  width:600px;height:600px;
  background:radial-gradient(circle,rgba(212,175,55,0.08) 0%,transparent 70%);
  border-radius:50%;pointer-events:none;
}
.hero::after{
  content:'';position:absolute;bottom:-30%;left:-10%;
  width:400px;height:400px;
  background:radial-gradient(circle,rgba(194,59,34,0.06) 0%,transparent 70%);
  border-radius:50%;pointer-events:none;
}
.hero-inner{
  max-width:var(--layout-width);margin:0 auto;
  position:relative;z-index:1;
  display:flex;align-items:center;gap:48px;
}
.hero-left{flex:1;min-width:0}
.hero-badge{
  display:inline-flex;align-items:center;gap:6px;
  background:var(--gold-light);
  color:var(--gold);padding:4px 14px;border-radius:4px;
  font-size:12px;font-weight:600;margin-bottom:16px;
}
.hero-left h1{
  font-size:36px;font-weight:900;color:#fff;
  line-height:1.2;margin-bottom:10px;
  letter-spacing:2px;
}
.hero-left p{
  font-size:15px;color:rgba(255,255,255,0.6);
  line-height:1.7;margin-bottom:24px;max-width:520px;
}
.hero-features{
  display:flex;gap:10px;flex-wrap:wrap;
}
.hero-feat{
  display:flex;align-items:center;gap:8px;
  padding:10px 18px;border-radius:8px;
  border:1px solid rgba(255,255,255,0.08);
  background:rgba(255,255,255,0.04);
  color:rgba(255,255,255,0.7);font-size:13px;font-weight:500;
  cursor:pointer;transition:var(--transition-fast);
}
.hero-feat:hover{
  background:var(--gold-light);
  border-color:rgba(212,175,55,0.3);
  color:var(--gold);transform:translateY(-2px);
}
.hero-feat .icon{font-size:18px}

/* Hero Right Mockup */
.hero-right{flex-shrink:0;width:260px;position:relative}
.hero-mockup{
  background:rgba(255,255,255,0.04);
  border:1px solid rgba(255,255,255,0.08);
  border-radius:16px;padding:18px;
  backdrop-filter:blur(10px);
}
.hero-mockup .mock-header{
  display:flex;align-items:center;gap:8px;margin-bottom:12px;
}
.hero-mockup .mock-dot{
  width:8px;height:8px;border-radius:50%;
  background:#ef4444;
}
.hero-mockup .mock-dot:nth-child(2){background:#f59e0b}
.hero-mockup .mock-dot:nth-child(3){background:#10b981}
.hero-mockup .mock-title{
  color:rgba(255,255,255,0.4);font-size:11px;margin-left:auto;
}
.hero-mockup .mock-line{
  height:5px;border-radius:3px;margin-bottom:7px;
  background:rgba(255,255,255,0.06);
}
.hero-mockup .mock-line:nth-child(2){width:80%}
.hero-mockup .mock-line:nth-child(3){width:60%}
.hero-mockup .mock-line:nth-child(4){width:70%}
.hero-mockup .mock-tag{
  display:inline-block;padding:3px 10px;border-radius:4px;
  font-size:11px;background:var(--gold-light);
  color:var(--gold);margin-top:6px;
}
.mock-terminal{
  margin-top:12px;
  background:rgba(0,0,0,0.3);
  border-radius:8px;padding:10px 12px;
  font-family:'Menlo','Monaco','Courier New',monospace;
  font-size:11px;color:rgba(212,175,55,0.6);line-height:1.6;
}
.mock-terminal span{color:rgba(255,255,255,0.3)}
.mock-terminal .ok{color:#10b981}

/* ===== SECTION HEADER ===== */
.section-header{
  max-width:var(--layout-width);
  margin:28px auto 16px;
  padding:0 20px;
  display:flex;align-items:center;justify-content:space-between;
}
.section-header h2{
  font-size:20px;font-weight:700;color:var(--text-primary);
  display:flex;align-items:center;gap:8px;
  transition:color var(--transition);
}
.section-header .total{
  font-size:13px;color:var(--text-tertiary);
}

/* ===== ARTICLES GRID ===== */
.articles-grid{
  max-width:var(--layout-width);margin:0 auto;
  padding:0 20px 48px;
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:16px;
}
.article-card{
  background:var(--bg-card);border-radius:var(--radius);
  box-shadow:var(--shadow);
  display:flex;overflow:hidden;
  cursor:pointer;transition:var(--transition-fast);
  border:1px solid var(--border-color);
}
.article-card:hover{
  box-shadow:var(--shadow-hover);
  transform:translateY(-2px);
  border-color:var(--gold-dark);
}
.article-card .card-img-wrap{
  width:180px;min-height:140px;flex-shrink:0;
  overflow:hidden;position:relative;
}
.article-card .card-img{
  width:100%;height:100%;object-fit:cover;
  transition:transform 0.5s;
}
.article-card:hover .card-img{transform:scale(1.06)}
.article-card .card-body{
  flex:1;padding:16px 18px;
  display:flex;flex-direction:column;
  min-width:0;
}
.card-tags{
  display:flex;gap:6px;margin-bottom:8px;flex-wrap:wrap;
}
.card-tag{
  display:inline-flex;align-items:center;gap:3px;
  padding:2px 10px;border-radius:4px;
  font-size:11px;font-weight:600;
}
.article-card h3{
  font-size:15px;font-weight:700;color:var(--text-primary);
  line-height:1.4;margin-bottom:6px;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.article-card .card-desc{
  font-size:12px;color:var(--text-secondary);line-height:1.6;
  flex:1;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.article-card .card-meta{
  display:flex;align-items:center;gap:10px;
  font-size:11px;color:var(--text-tertiary);margin-top:8px;
}

/* ===== MODAL ===== */
.modal-overlay{
  position:fixed;inset:0;z-index:2000;
  background:var(--overlay-bg);
  backdrop-filter:blur(6px);
  -webkit-backdrop-filter:blur(6px);
  display:none;align-items:flex-start;justify-content:center;
  padding:48px 20px;overflow-y:auto;
}
.modal-overlay.show{display:flex}
.modal-content{
  background:var(--bg-card);border-radius:var(--radius);
  max-width:800px;width:100%;margin:auto;
  box-shadow:var(--shadow-elevated);
  animation:modalIn var(--transition);
  overflow:hidden;
  transition:background var(--transition),color var(--transition);
}
@keyframes modalIn{
  from{opacity:0;transform:translateY(30px)}
  to{opacity:1;transform:translateY(0)}
}
.modal-header{
  position:relative;overflow:hidden;height:200px;
}
.modal-header img{width:100%;height:100%;object-fit:cover}
.modal-header-overlay{
  position:absolute;inset:0;
  background:linear-gradient(transparent 30%,rgba(0,0,0,0.6) 100%);
}
.modal-close{
  position:absolute;top:14px;right:14px;z-index:10;
  width:36px;height:36px;border-radius:50%;
  background:rgba(0,0,0,0.4);border:1px solid rgba(255,255,255,0.15);
  color:#fff;font-size:18px;cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  transition:var(--transition-fast);
}
.modal-close:hover{background:var(--red)}
.modal-body{padding:24px 32px 32px}
.modal-tag-wrap{margin-bottom:8px}
.modal-body h2{
  font-size:24px;font-weight:800;
  color:var(--text-primary);
  line-height:1.4;margin-bottom:20px;
}
.article-content{font-size:15px;color:var(--text-secondary);line-height:1.9}
.article-content h4{
  color:var(--red);font-size:15px;font-weight:700;
  margin:20px 0 8px;padding-bottom:4px;
  border-bottom:1px solid var(--border-color);
}
.article-content .quote-block{
  background:rgba(250,245,240,1);
  border-left:3px solid var(--gold);
  padding:16px 20px;margin:8px 0 16px;
  border-radius:0 6px 6px 0;
  font-family:var(--font-serif);
  font-style:italic;color:#6b5b4e;font-size:14px;
  line-height:2;white-space:pre-wrap;
}
[data-theme="dark"] .article-content .quote-block{
  background:rgba(30,40,54,0.8);
  color:#c7d1db;
}
.article-content .quote-block strong{color:var(--red);font-weight:600}
.article-content p{margin-bottom:12px;text-indent:2em}
.article-content p:first-of-type{text-indent:0}
.modal-nav{
  display:flex;justify-content:space-between;
  margin-top:28px;padding-top:16px;
  border-top:1px solid var(--border-color);gap:12px;
}
.modal-nav button{
  padding:8px 20px;border-radius:8px;
  background:var(--bg-soft);border:1px solid var(--border-color);
  color:var(--text-secondary);cursor:pointer;font-size:13px;
  transition:var(--transition-fast);font-weight:500;
  display:flex;align-items:center;gap:6px;
}
.modal-nav button:hover{
  background:var(--bg-darker);color:#fff;border-color:var(--bg-darker);
}
[data-theme="dark"] .modal-nav button:hover{
  background:var(--gold-dark);border-color:var(--gold-dark);
}
.modal-nav button:disabled{opacity:0.3;cursor:not-allowed}
.modal-nav button:disabled:hover{
  background:var(--bg-soft);color:var(--text-secondary);border-color:var(--border-color);
}

/* ===== ABOUT ===== */
.about-section{
  max-width:var(--layout-width);margin:0 auto 40px;
  padding:0 20px;
}
.about-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:12px;
}
.about-card{
  background:var(--bg-card);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:20px;
  border:1px solid var(--border-color);
  transition:var(--transition-fast);
}
.about-card:hover{
  box-shadow:var(--shadow-hover);
  transform:translateY(-2px);
  border-color:var(--gold-dark);
}
.about-card .icon{font-size:28px;margin-bottom:10px}
.about-card h3{
  font-size:14px;font-weight:700;
  color:var(--text-primary);margin-bottom:6px;
}
.about-card p{
  font-size:12px;color:var(--text-secondary);line-height:1.7;
}

/* ===== FOOTER ===== */
.footer{
  background:var(--bg-darker);padding:28px 20px 22px;text-align:center;
  transition:background var(--transition);
}
.footer-inner{max-width:var(--layout-width);margin:0 auto}
.footer-links{
  display:flex;justify-content:center;
  gap:16px;margin-bottom:12px;flex-wrap:wrap;
}
.footer-links a{
  font-size:12px;color:rgba(255,255,255,0.4);
  transition:color var(--transition-fast);
}
.footer-links a:hover{color:var(--gold)}
.footer p{
  font-size:11px;color:rgba(255,255,255,0.3);
  letter-spacing:1px;
}

/* ===== SCROLL TOP ===== */
.scroll-top{
  position:fixed;bottom:28px;right:28px;z-index:999;
  width:44px;height:44px;border-radius:50%;
  background:var(--bg-darker);border:none;
  color:#fff;font-size:20px;cursor:pointer;
  display:none;align-items:center;justify-content:center;
  box-shadow:0 4px 16px rgba(0,0,0,0.2);
  transition:var(--transition-fast);
}
.scroll-top.show{display:flex}
.scroll-top:hover{
  transform:translateY(-3px);
  background:var(--gold);color:var(--bg-darker);
}

/* ===== RESPONSIVE ===== */
@media(max-width:1024px){
  .hero-right{display:none}
  .hero-left h1{font-size:32px}
  .about-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .header-inner{padding:0 14px}
  .logo-text span{display:none}
  .logo-text strong{font-size:15px}
  .search-box{max-width:160px}
  .hero{padding:36px 14px 32px}
  .hero-left h1{font-size:26px}
  .hero-features{gap:8px}
  .hero-feat{padding:8px 14px;font-size:12px}
  .articles-grid{grid-template-columns:1fr;padding:0 14px 32px}
  .section-header{padding:0 14px;margin:20px auto 12px}
  .article-card .card-img-wrap{width:130px}
  .modal-body{padding:16px 20px 24px}
  .modal-body h2{font-size:20px}
  .modal-header{height:160px}
  .about-grid{grid-template-columns:1fr}
  .nav-tab{font-size:12px;padding:6px 10px}
}
@media(max-width:480px){
  .logo-avatar{width:30px;height:30px;font-size:15px}
  .logo-text strong{font-size:13px}
  .search-box{max-width:120px}
  .search-box input{height:32px;font-size:12px;padding:0 30px 0 10px}
  .hero-left h1{font-size:22px}
  .article-card .card-img-wrap{width:100px;min-height:100px}
  .article-card .card-body{padding:12px 14px}
  .article-card h3{font-size:13px}
  .scroll-top{bottom:16px;right:16px;width:38px;height:38px;font-size:16px}
}