/* ===== 站酷风格 · 省钱兄产品展示 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #f5f5f5;
  --bg-white: #ffffff;
  --text: #222222;
  --text-secondary: #999999;
  --text-light: #bbbbbb;
  --border: #eeeeee;
  --accent: #ffe300;
  --accent-hover: #ffd000;
  --header-h: 60px;
  --radius: 4px;
  --shadow: 0 2px 12px rgba(0,0,0,.08);
  --shadow-hover: 0 8px 32px rgba(0,0,0,.15);
  --transition: .3s cubic-bezier(.4,0,.2,1);
  --font: 'Noto Sans SC', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
img { max-width: 100%; display: block; }
.container { max-width: 1440px; margin: 0 auto; padding: 0 24px; }

/* ===== Header ===== */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: var(--bg-white);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition);
}
.header.scrolled { box-shadow: var(--shadow); }
.header-inner {
  max-width: 1440px; margin: 0 auto; padding: 0 24px;
  height: var(--header-h);
  display: flex; align-items: center; justify-content: space-between;
}
.logo { display: flex; align-items: center; gap: 10px; }
.logo-icon {
  width: 36px; height: 36px; background: var(--accent);
  border-radius: 6px; display: flex; align-items: center; justify-content: center;
  font-weight: 900; font-size: 16px; color: var(--text);
}
.logo-text { font-size: 18px; font-weight: 700; letter-spacing: -.5px; }
.logo-sub { font-weight: 400; color: var(--text-secondary); margin-left: 2px; }
.nav { display: flex; gap: 32px; }
.nav-link {
  font-size: 14px; font-weight: 500; color: var(--text-secondary);
  transition: color var(--transition); position: relative;
}
.nav-link:hover, .nav-link.active { color: var(--text); }
.nav-link.active::after {
  content: ''; position: absolute; bottom: -4px; left: 0; right: 0;
  height: 2px; background: var(--accent);
}
.header-actions { display: flex; align-items: center; gap: 12px; }
.search-btn, .menu-btn { width: 40px; height: 40px; display: flex; align-items: center; justify-content: center; border-radius: 50%; transition: background var(--transition); }
.search-btn:hover { background: var(--bg); }
.menu-btn { display: none; flex-direction: column; gap: 5px; }
.menu-btn span { display: block; width: 20px; height: 2px; background: var(--text); transition: var(--transition); }

.search-bar {
  display: none; padding: 12px 24px; border-top: 1px solid var(--border);
  background: var(--bg-white); gap: 12px; align-items: center;
}
.search-bar.open { display: flex; }
.search-bar input {
  flex: 1; border: none; outline: none; font-size: 15px;
  font-family: var(--font); background: var(--bg); padding: 10px 16px; border-radius: 20px;
}
.search-close { font-size: 18px; color: var(--text-secondary); padding: 8px; }

/* ===== Hero ===== */
.hero {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  position: relative; overflow: hidden; padding-top: var(--header-h);
  background: var(--bg-white);
}
.hero-bg {
  position: absolute; inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(255,227,0,.15) 0%, transparent 70%);
}
.hero-content { text-align: center; position: relative; z-index: 1; padding: 40px 24px; }
.hero-badge {
  display: inline-block; padding: 6px 16px; background: var(--bg);
  border-radius: 20px; font-size: 13px; color: var(--text-secondary);
  margin-bottom: 32px; letter-spacing: .5px;
}
.hero-title { margin-bottom: 24px; }
.hero-line { display: block; font-size: clamp(40px, 8vw, 80px); font-weight: 900; line-height: 1.1; letter-spacing: -2px; }
.hero-highlight { color: var(--text); position: relative; }
.hero-highlight::after {
  content: ''; position: absolute; bottom: 4px; left: 0; right: 0;
  height: 12px; background: var(--accent); z-index: -1; opacity: .6;
}
.hero-desc { font-size: 16px; color: var(--text-secondary); line-height: 1.8; margin-bottom: 48px; }
.hero-stats {
  display: flex; align-items: center; justify-content: center; gap: 40px;
  margin-bottom: 48px;
}
.stat-item { text-align: center; }
.stat-num { display: block; font-size: 48px; font-weight: 900; line-height: 1; letter-spacing: -1px; }
.stat-label { font-size: 13px; color: var(--text-secondary); margin-top: 6px; }
.stat-divider { width: 1px; height: 40px; background: var(--border); }
.hero-cta {
  display: inline-block; padding: 14px 36px; background: var(--text);
  color: var(--bg-white); border-radius: 30px; font-size: 15px; font-weight: 500;
  transition: all var(--transition);
}
.hero-cta:hover { background: #444; transform: translateY(-2px); box-shadow: var(--shadow-hover); }
.hero-scroll { position: absolute; bottom: 32px; left: 50%; transform: translateX(-50%); }
.scroll-indicator {
  width: 24px; height: 40px; border: 2px solid var(--border); border-radius: 12px;
  position: relative;
}
.scroll-indicator::after {
  content: ''; position: absolute; top: 6px; left: 50%; transform: translateX(-50%);
  width: 4px; height: 8px; background: var(--text-secondary); border-radius: 2px;
  animation: scrollBounce 1.5s infinite;
}
@keyframes scrollBounce {
  0%, 100% { transform: translateX(-50%) translateY(0); opacity: 1; }
  50% { transform: translateX(-50%) translateY(8px); opacity: .3; }
}

/* ===== Section Header ===== */
.section-header { margin-bottom: 32px; }
.section-header.center { text-align: center; }
.section-title { font-size: 28px; font-weight: 700; letter-spacing: -.5px; margin-bottom: 8px; }
.section-subtitle { font-size: 14px; color: var(--text-secondary); }

/* ===== Filter ===== */
.filter-section { padding: 80px 0 24px; background: var(--bg-white); }
.filter-tabs {
  display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 24px;
}
.filter-tab {
  padding: 8px 18px; border-radius: 20px; font-size: 13px; font-weight: 500;
  color: var(--text-secondary); background: var(--bg); border: 1px solid transparent;
  transition: all var(--transition); white-space: nowrap;
}
.filter-tab:hover { color: var(--text); border-color: var(--border); }
.filter-tab.active { background: var(--text); color: var(--bg-white); }
.filter-meta {
  display: flex; align-items: center; justify-content: space-between;
  padding-bottom: 16px; border-bottom: 1px solid var(--border);
  font-size: 13px; color: var(--text-secondary);
}
.sort-options { display: flex; gap: 4px; }
.sort-btn {
  padding: 4px 12px; border-radius: 4px; font-size: 13px; color: var(--text-secondary);
  transition: all var(--transition);
}
.sort-btn.active, .sort-btn:hover { color: var(--text); background: var(--bg); }

/* ===== Gallery Grid (Zcool Waterfall) ===== */
.gallery-section { padding: 24px 0 80px; background: var(--bg-white); }
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.card {
  background: var(--bg-white); border-radius: var(--radius);
  overflow: hidden; cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
  border: 1px solid var(--border);
  animation: fadeInUp .5s ease both;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.card-image {
  position: relative; overflow: hidden; aspect-ratio: 16/10;
  background: var(--bg);
}
.card-image img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform .5s ease;
}
.card:hover .card-image img { transform: scale(1.04); }
.card-color-bar {
  position: absolute; top: 0; left: 0; right: 0; height: 4px;
}
.card-overlay {
  position: absolute; inset: 0; background: rgba(0,0,0,.5);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: opacity var(--transition);
}
.card:hover .card-overlay { opacity: 1; }
.card-view-btn {
  padding: 10px 24px; background: var(--bg-white); color: var(--text);
  border-radius: 20px; font-size: 13px; font-weight: 500;
  transform: translateY(8px); transition: transform var(--transition);
}
.card:hover .card-view-btn { transform: translateY(0); }
.card-body { padding: 16px; }
.card-id {
  font-size: 11px; color: var(--text-light); font-weight: 500;
  letter-spacing: 1px; text-transform: uppercase; margin-bottom: 6px;
}
.card-title {
  font-size: 15px; font-weight: 600; line-height: 1.4; margin-bottom: 8px;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.card-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.card-tag {
  padding: 2px 8px; background: var(--bg); border-radius: 3px;
  font-size: 11px; color: var(--text-secondary);
}
.card-meta {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--border);
  font-size: 12px; color: var(--text-light);
}
.card-tech { font-weight: 500; color: var(--text-secondary); }

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.load-more-wrap { text-align: center; margin-top: 48px; }
.load-more-btn {
  padding: 12px 48px; border: 1px solid var(--border); border-radius: 30px;
  font-size: 14px; color: var(--text-secondary); transition: all var(--transition);
}
.load-more-btn:hover { border-color: var(--text); color: var(--text); }

/* ===== Tech Section ===== */
.tech-section { padding: 80px 0; background: var(--bg); }
.tech-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px;
}
.tech-card {
  background: var(--bg-white); padding: 32px 24px; border-radius: var(--radius);
  text-align: center; border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition);
}
.tech-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.tech-icon {
  width: 56px; height: 56px; border-radius: 12px; margin: 0 auto 16px;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; font-weight: 900; color: white;
}
.tech-icon.java { background: #f89820; }
.tech-icon.uni { background: #42b883; }
.tech-icon.vue { background: #4fc3f7; }
.tech-icon.open { background: #666; font-size: 28px; }
.tech-card h3 { font-size: 16px; font-weight: 600; margin-bottom: 8px; }
.tech-card p { font-size: 13px; color: var(--text-secondary); line-height: 1.6; }

/* ===== About ===== */
.about-section { padding: 80px 0; background: var(--bg-white); }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.about-text { font-size: 15px; color: var(--text-secondary); line-height: 1.8; margin-bottom: 16px; }
.about-features { list-style: none; margin-top: 24px; }
.about-features li { padding: 8px 0; font-size: 14px; color: var(--text); }
.about-visual {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px;
}
.about-card {
  background: var(--bg); padding: 20px 16px; border-radius: var(--radius);
  border-left: 3px solid var(--accent, #FFD100);
  transition: transform var(--transition);
}
.about-card:hover { transform: translateY(-2px); }
.about-num { display: block; font-size: 24px; font-weight: 900; color: var(--accent); opacity: .8; }
.about-name { font-size: 13px; color: var(--text-secondary); margin-top: 4px; }

/* ===== Contact ===== */
.contact-section { padding: 80px 0; background: var(--bg); }
.contact-card {
  background: var(--text); color: var(--bg-white);
  padding: 64px; border-radius: 8px; text-align: center;
}
.contact-card h2 { font-size: 32px; font-weight: 700; margin-bottom: 12px; }
.contact-card p { font-size: 15px; opacity: .7; margin-bottom: 32px; }
.contact-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn-primary {
  padding: 14px 32px; background: var(--accent); color: var(--text);
  border-radius: 30px; font-size: 15px; font-weight: 600;
  transition: all var(--transition);
}
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-2px); }
.btn-outline {
  padding: 14px 32px; border: 1px solid rgba(255,255,255,.3); color: var(--bg-white);
  border-radius: 30px; font-size: 15px; transition: all var(--transition);
}
.btn-outline:hover { border-color: var(--bg-white); }

/* ===== Footer ===== */
.footer { padding: 32px 0; background: var(--bg-white); border-top: 1px solid var(--border); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.footer-brand { display: flex; align-items: center; gap: 8px; font-weight: 600; font-size: 14px; }
.footer-copy { font-size: 12px; color: var(--text-light); }

/* ===== Modal ===== */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,.7);
  z-index: 2000; display: flex; align-items: center; justify-content: center;
  padding: 24px; opacity: 0; visibility: hidden; transition: all var(--transition);
}
.modal-overlay.open { opacity: 1; visibility: visible; }
.modal-overlay.open .modal { transform: translateY(0) scale(1); }
.modal {
  background: var(--bg-white); border-radius: 8px; max-width: 960px; width: 100%;
  max-height: 92vh; overflow-y: auto; position: relative;
  transform: translateY(20px) scale(.98); transition: transform var(--transition);
}
.modal-close {
  position: absolute; top: 16px; right: 16px; z-index: 10;
  width: 36px; height: 36px; background: rgba(0,0,0,.5); color: white;
  border-radius: 50%; font-size: 16px; display: flex; align-items: center; justify-content: center;
  transition: background var(--transition);
}
.modal-close:hover { background: rgba(0,0,0,.8); }
.modal-body { display: flex; flex-direction: column; }
.modal-image {
  background: var(--bg); display: flex; align-items: center; justify-content: center;
  padding: 0; overflow: visible;
}
.modal-image img {
  width: 100%; height: auto; object-fit: contain; object-position: center;
  max-width: 100%; display: block;
}
.modal-info { padding: 32px; border-top: 1px solid var(--border); }
.modal-id { font-size: 12px; color: var(--text-light); letter-spacing: 1px; margin-bottom: 8px; }
.modal-title { font-size: 22px; font-weight: 700; margin-bottom: 16px; line-height: 1.3; }
.modal-desc { font-size: 14px; color: var(--text-secondary); line-height: 1.8; margin-bottom: 24px; }
.modal-specs { display: flex; flex-direction: column; gap: 12px; }
.modal-spec {
  display: flex; gap: 12px; font-size: 13px; padding: 10px 0;
  border-bottom: 1px solid var(--border);
}
.modal-spec-label { color: var(--text-light); min-width: 70px; flex-shrink: 0; }
.modal-spec-value { color: var(--text); font-weight: 500; }
.modal-color-dot {
  display: inline-block; width: 12px; height: 12px; border-radius: 50%;
  margin-right: 6px; vertical-align: middle;
}

/* ===== Back Top ===== */
.back-top {
  position: fixed; bottom: 32px; right: 32px; z-index: 999;
  width: 44px; height: 44px; background: var(--text); color: var(--bg-white);
  border-radius: 50%; font-size: 18px;
  opacity: 0; visibility: hidden; transition: all var(--transition);
  box-shadow: var(--shadow);
}
.back-top.visible { opacity: 1; visibility: visible; }
.back-top:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }

/* ===== Empty State ===== */
.empty-state { text-align: center; padding: 80px 24px; color: var(--text-secondary); }
.empty-state p { font-size: 16px; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
}
@media (max-width: 768px) {
  .nav { display: none; }
  .menu-btn { display: flex; }
  .hero-stats { gap: 24px; }
  .stat-num { font-size: 36px; }
  .gallery-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; }
  .contact-card { padding: 40px 24px; }
  .about-visual { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .gallery-grid { grid-template-columns: 1fr; }
  .hero-line { font-size: 36px; }
}