/* ========== 设计变量 ========== */
:root {
  --bg: #0b0f1a;
  --bg-2: #111827;
  --card: #151c2c;
  --card-2: #1c2538;
  --border: #263149;
  --text: #e8ecf4;
  --text-2: #a8b2c7;
  --text-3: #6b7691;
  --accent: #4f6ef7;
  --accent-2: #7c5cff;
  --purple: #a78bfa;
  --radius: 12px;
  --max-w: 1100px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* ========== 导航 ========== */
.navbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(11,15,26,.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--max-w); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 24px;
}
.logo { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 17px; }
.logo-mark { color: var(--accent); }
.nav-links { display: flex; gap: 28px; }
.nav-links a {
  color: var(--text-2); font-size: 14px; transition: color .2s;
}
.nav-links a:hover { color: var(--text); }
.nav-toggle {
  display: none; flex-direction: column; gap: 4px;
  background: none; border: none; cursor: pointer; padding: 4px;
}
.nav-toggle span { width: 22px; height: 2px; background: var(--text); border-radius: 2px; }

/* ========== Hero ========== */
.hero { padding: 80px 24px 60px; }
.hero-inner { max-width: var(--max-w); margin: 0 auto; }
.hero-eyebrow { color: var(--accent); font-size: 13px; letter-spacing: 2px; text-transform: uppercase; margin-bottom: 16px; }
.hero-title { font-size: clamp(32px, 6vw, 56px); line-height: 1.15; font-weight: 800; margin-bottom: 20px; }
.hero-sub { color: var(--text-2); font-size: 17px; max-width: 560px; margin-bottom: 32px; }

/* ========== 通用按钮 ========== */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 20px; border-radius: 8px; font-size: 14px;
  font-weight: 500; cursor: pointer; border: 1px solid transparent;
  transition: all .2s;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-2); transform: translateY(-1px); }
.btn-outline { background: transparent; border-color: var(--border); color: var(--text); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

/* ========== 区块通用 ========== */
section { padding: 60px 24px; }
.section-head { max-width: var(--max-w); margin: 0 auto 32px; }
.section-head h2 { font-size: 28px; margin-bottom: 6px; }
.section-sub { color: var(--text-3); font-size: 14px; }

/* ========== 作品展示 ========== */
.filter-bar {
  max-width: var(--max-w); margin: 0 auto 24px;
  display: flex; gap: 8px; flex-wrap: wrap;
}
.filter-btn {
  padding: 6px 16px; border-radius: 20px;
  background: var(--card); border: 1px solid var(--border);
  color: var(--text-2); font-size: 13px; cursor: pointer; transition: all .2s;
}
.filter-btn:hover { color: var(--text); border-color: var(--text-3); }
.filter-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }

.works-grid {
  max-width: var(--max-w); margin: 0 auto;
  display: grid; gap: 24px;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
}
.work-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
  display: flex; flex-direction: column;
  transition: transform .2s, border-color .2s;
}
.work-card:hover { transform: translateY(-3px); border-color: var(--accent); }

.work-cover {
  position: relative; aspect-ratio: 16/9;
  background: linear-gradient(135deg, var(--card-2), var(--bg-2));
  overflow: hidden;
}
.work-cover img { width: 100%; height: 100%; object-fit: cover; }
.work-cover.no-cover::after {
  content: '🎬'; position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 48px;
}
.featured-badge {
  position: absolute; top: 12px; left: 12px;
  background: var(--accent); color: #fff;
  padding: 3px 10px; border-radius: 12px; font-size: 11px; font-weight: 600;
}

.work-body { padding: 18px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.work-meta { display: flex; justify-content: space-between; align-items: center; font-size: 12px; }
.work-cat { color: var(--purple); font-weight: 500; }
.work-date { color: var(--text-3); }
.work-title { font-size: 18px; font-weight: 600; }
.work-summary { color: var(--text-2); font-size: 13px; flex: 1; }

.work-tags { display: flex; gap: 6px; flex-wrap: wrap; }
.tag {
  display: inline-block; padding: 3px 10px; border-radius: 12px;
  background: var(--card-2); color: var(--text-2); font-size: 12px;
}
.tag-sm { font-size: 11px; padding: 2px 8px; }

.work-detail-btn { align-self: flex-start; margin-top: 4px; padding: 7px 16px; font-size: 13px; }

.empty-state { max-width: var(--max-w); margin: 40px auto; text-align: center; color: var(--text-3); }

/* ========== 关于 ========== */
.about-grid {
  max-width: var(--max-w); margin: 0 auto;
  display: grid; gap: 20px; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}
.about-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px;
}
.about-card h3 { margin-bottom: 10px; font-size: 17px; }
.about-card p { color: var(--text-2); font-size: 14px; }
.about-card .tags { display: flex; gap: 8px; flex-wrap: wrap; }

/* ========== 联系 ========== */
.contact-links {
  max-width: var(--max-w); margin: 0 auto;
  display: flex; gap: 16px; flex-wrap: wrap;
}
.contact-item {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 20px; background: var(--card);
  border: 1px solid var(--border); border-radius: var(--radius);
  font-size: 14px; color: var(--text-2); transition: all .2s;
}
.contact-item:hover { color: var(--accent); border-color: var(--accent); }
.contact-icon { font-size: 18px; }

/* ========== 页脚 ========== */
.footer { text-align: center; padding: 32px 24px; color: var(--text-3); font-size: 13px; border-top: 1px solid var(--border); }

/* ========== 模态框 ========== */
.modal {
  position: fixed; inset: 0; z-index: 200;
  display: none; align-items: center; justify-content: center;
  padding: 20px;
}
.modal.open { display: flex; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(0,0,0,.7); backdrop-filter: blur(4px); }
.modal-content {
  position: relative; max-width: 720px; width: 100%;
  max-height: 88vh; overflow-y: auto;
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px;
}
.modal-close {
  position: absolute; top: 12px; right: 12px;
  background: var(--card-2); border: 1px solid var(--border);
  color: var(--text-2); width: 32px; height: 32px;
  border-radius: 8px; cursor: pointer; font-size: 14px;
}
.modal-close:hover { color: var(--text); }
.modal-cover { aspect-ratio: 16/9; border-radius: 8px; overflow: hidden; margin-bottom: 20px; background: var(--card-2); }
.modal-cover img { width: 100%; height: 100%; object-fit: cover; }
.modal-info .work-meta { margin-bottom: 8px; }
.modal-info h2 { font-size: 24px; margin-bottom: 12px; }
.modal-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 16px; }
.modal-desc { color: var(--text-2); font-size: 14px; line-height: 1.8; margin-bottom: 16px; }
.modal-tech { font-size: 13px; color: var(--text-2); margin-bottom: 20px; }
.modal-tech strong { color: var(--text); }
.modal-links { display: flex; gap: 12px; flex-wrap: wrap; }

/* ========== 响应式 ========== */
@media (max-width: 768px) {
  .nav-links {
    display: none; flex-direction: column; gap: 16px;
    position: absolute; top: 100%; left: 0; right: 0;
    background: var(--bg); border-bottom: 1px solid var(--border);
    padding: 20px 24px;
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }
  .hero { padding: 50px 20px 40px; }
  section { padding: 44px 20px; }
  .works-grid { grid-template-columns: 1fr; }
  .modal-content { padding: 16px; }
}