/* ============================================
   墨韵东方 — ibuildhome.art Design System
   ============================================ */

:root {
  --bg: #f5f0e8;
  --bg-card: #faf6ee;
  --bg-elevated: #fff;
  --bg-hero: #ede4d3;
  --bg-dark: #2c1810;
  --text: #2c1810;
  --text-secondary: #6b5d4d;
  --text-muted: #9c8f7d;
  --text-light: #d4c5a9;
  --gold: #b8860b;
  --gold-light: #d4a017;
  --gold-bg: rgba(184,134,11,0.08);
  --gold-border: rgba(184,134,11,0.2);
  --border: #e0d5c0;
  --border-strong: #d0c4b0;
  --shadow-sm: 0 2px 8px rgba(44,24,16,0.06);
  --shadow-md: 0 4px 20px rgba(44,24,16,0.08);
  --shadow-lg: 0 8px 32px rgba(44,24,16,0.1);
  --radius: 12px;
  --radius-lg: 20px;
  --max-width: 1200px;
  --content-width: 900px;
  --font-title: 'Noto Serif SC','STSong','SimSun','PMingLiU',serif;
  --font-body: -apple-system,'Segoe UI','Noto Sans SC','Microsoft YaHei',sans-serif;
  --transition: cubic-bezier(0.4,0,0.2,1);
}
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--font-body);color:var(--text);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased}
.container{max-width:var(--max-width);margin:0 auto;padding:0 2rem}
.content-wrap{max-width:var(--content-width);margin:0 auto}

.navbar{position:fixed;top:0;left:0;right:0;z-index:1000;padding:1.2rem 0;transition:all 0.3s var(--transition);background:rgba(245,240,232,0.92);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-bottom:1px solid var(--border)}
.navbar.scrolled{padding:0.8rem 0;background:rgba(245,240,232,0.98);box-shadow:var(--shadow-md)}
.navbar .container{display:flex;justify-content:space-between;align-items:center}
.navbar .logo{font-family:var(--font-title);font-size:1.6rem;font-weight:700;color:var(--text);text-decoration:none;letter-spacing:2px}
.navbar .logo .gold{color:var(--gold)}
.navbar .nav-links{display:flex;gap:2rem;list-style:none;align-items:center}
.navbar .nav-links a{color:var(--text-secondary);text-decoration:none;font-weight:500;font-size:0.95rem;transition:color 0.3s ease;position:relative}
.navbar .nav-links a::after{content:'';position:absolute;bottom:-4px;left:0;width:0;height:2px;background:var(--gold);transition:width 0.3s ease}
.navbar .nav-links a:hover{color:var(--gold)}
.navbar .nav-links a:hover::after{width:100%}
.navbar .nav-links a.active{color:var(--gold)}
.navbar .nav-links a.active::after{width:100%}

.hero-section{padding:8rem 0 4rem;text-align:center;background:var(--bg-hero);position:relative;overflow:hidden}
.hero-section::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background:url("data:image/svg+xml,%3Csvg width='40' height='40' viewBox='0 0 40 40' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%23b8860b' fill-opacity='0.04'%3E%3Cpath d='M20 0v40M0 20h40' stroke='%23b8860b' stroke-width='0.5'/%3E%3C/g%3E%3C/svg%3E");pointer-events:none}
.hero-section>*{position:relative;z-index:1}
.hero-section h1{font-family:var(--font-title);font-size:clamp(2rem,5vw,3.5rem);font-weight:700;color:var(--text);margin-bottom:1rem}
.hero-section h1 .gold{color:var(--gold)}
.hero-section p{max-width:600px;margin:0 auto;color:var(--text-secondary);font-size:1.1rem;line-height:1.8}
.hero-section .hero-stats{display:flex;justify-content:center;gap:3rem;margin-top:2rem;flex-wrap:wrap}
.hero-section .hero-stat{text-align:center}
.hero-section .hero-stat .num{font-size:2rem;font-weight:700;font-family:var(--font-title);color:var(--gold)}
.hero-section .hero-stat .label{font-size:0.85rem;color:var(--text-muted)}

.section{padding:5rem 0}
.section-title{font-family:var(--font-title);font-size:2rem;font-weight:700;text-align:center;margin-bottom:0.8rem;color:var(--text)}
.section-subtitle{text-align:center;color:var(--text-secondary);font-size:1rem;margin-bottom:3rem}

.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;transition:all 0.3s var(--transition)}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.card-img{width:100%;height:200px;object-fit:cover;display:block}
.card-body{padding:1.5rem}
.card-tag{display:inline-block;padding:0.25rem 0.8rem;background:var(--gold-bg);color:var(--gold);font-size:0.75rem;border-radius:20px;margin-bottom:0.8rem}
.card-title{font-family:var(--font-title);font-size:1.2rem;font-weight:600;margin-bottom:0.6rem;color:var(--text);line-height:1.4}
.card-text{color:var(--text-secondary);font-size:0.9rem;line-height:1.6;margin-bottom:1rem}
.card-meta{display:flex;justify-content:space-between;align-items:center;padding-top:0.8rem;border-top:1px solid var(--border);font-size:0.82rem;color:var(--text-muted)}
.card-meta .read-more{color:var(--gold);text-decoration:none;font-weight:600;font-size:0.85rem;transition:gap 0.3s;display:flex;align-items:center;gap:0.3rem}
.card-meta .read-more:hover{gap:0.6rem}

.blog-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:1.5rem}
.tools-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1.5rem}

.btn{display:inline-block;padding:0.8rem 2rem;border-radius:50px;font-weight:600;font-size:0.95rem;text-decoration:none;transition:all 0.3s var(--transition);border:none;cursor:pointer}
.btn-primary{background:var(--gold);color:#fff}
.btn-primary:hover{background:var(--gold-light);transform:translateY(-2px);box-shadow:0 6px 20px rgba(184,134,11,0.3)}
.btn-outline{background:transparent;color:var(--gold);border:2px solid var(--gold-border)}
.btn-outline:hover{background:var(--gold);color:#fff;transform:translateY(-2px)}

.filter-bar{display:flex;gap:0.8rem;flex-wrap:wrap;justify-content:center;margin:0 auto 2.5rem;padding:1.2rem;background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border);max-width:800px}
.filter-btn{padding:0.5rem 1.5rem;border-radius:50px;border:2px solid var(--border);background:var(--bg-elevated);cursor:pointer;font-size:0.85rem;font-weight:500;color:var(--text-secondary);transition:all 0.3s}
.filter-btn:hover{border-color:var(--gold);color:var(--gold)}
.filter-btn.active{background:var(--gold);color:#fff;border-color:var(--gold)}

.series-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:1rem;margin-bottom:2rem}
.series-card{background:var(--bg-card);border:1px solid var(--border);border-top:3px solid var(--gold);border-radius:var(--radius);overflow:hidden;transition:all 0.3s var(--transition)}
.series-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}
.series-card-header{display:flex;align-items:center;gap:0.5rem;padding:1.2rem 1.2rem 0;font-weight:600;font-size:1rem;text-decoration:none;color:var(--text);cursor:pointer}
.series-card-header .arrow{margin-left:auto;color:var(--text-muted);font-size:0.9rem}
.series-card-body{padding:0.5rem 1.2rem 1rem}
.series-card-body a{display:flex;align-items:center;padding:0.5rem 0.8rem;border-radius:8px;font-size:0.85rem;color:var(--text-secondary);text-decoration:none;gap:0.4rem;transition:background 0.2s}
.series-card-body a:hover{background:var(--gold-bg);color:var(--gold)}
.series-card-body a .dot{width:5px;height:5px;border-radius:50%;background:var(--gold);flex-shrink:0;opacity:0.4}
.series-card-body a .reading{margin-left:auto;font-size:0.75rem;color:var(--text-muted);white-space:nowrap}

.section-heading{font-size:1.1rem;font-weight:700;margin-bottom:1rem;padding-left:0.8rem;border-left:3px solid var(--gold);display:flex;align-items:center;gap:0.5rem}
.section-heading .count{font-size:0.8rem;font-weight:500;background:var(--gold-bg);color:var(--gold);padding:0.15rem 0.6rem;border-radius:12px}

.about-card{max-width:700px;margin:0 auto;text-align:center}
.about-card p{color:var(--text-secondary);line-height:2;margin-bottom:2rem}
.about-stats{display:flex;justify-content:center;gap:3rem;flex-wrap:wrap}
.about-stats .stat-num{font-size:2.5rem;font-weight:700;font-family:var(--font-title);color:var(--gold)}
.about-stats .stat-label{color:var(--text-muted);font-size:0.9rem}

footer{background:var(--bg-dark);color:var(--text-light);padding:4rem 0 2rem}
footer a{color:var(--text-light);text-decoration:none;transition:color 0.3s}
footer a:hover{color:var(--gold-light)}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:3rem;margin-bottom:3rem}
footer h4{font-family:var(--font-title);color:var(--gold);margin-bottom:1.2rem;font-size:1.1rem}
footer ul{list-style:none}
footer li{margin-bottom:0.6rem}
footer p{line-height:1.6}
.footer-bottom{text-align:center;padding-top:2rem;border-top:1px solid rgba(212,197,169,0.2);font-size:0.85rem;color:var(--text-muted)}

.fade-in{opacity:0;transform:translateY(20px);transition:opacity 0.6s ease,transform 0.6s ease}
.fade-in.visible{opacity:1;transform:translateY(0)}
.no-results{text-align:center;padding:4rem 2rem;color:var(--text-muted)}
.no-results .emoji{font-size:3rem;margin-bottom:1rem}

@media(max-width:768px){
  .container{padding:0 1rem}
  .blog-grid,.tools-grid,.series-grid{grid-template-columns:1fr}
  .hero-section{padding:6rem 1rem 3rem}
  .hero-section .hero-stats{gap:1.5rem}
  .filter-bar{padding:0.8rem}
  .filter-btn{padding:0.4rem 1rem;font-size:0.8rem}
  .section{padding:3rem 0}
  .footer-grid{grid-template-columns:1fr 1fr}
  .navbar .nav-links{display:none}
}