/* =====================================================
   蓝色的网页设计练习作品集 - 主样式表
   ===================================================== */

:root {
  --blue-900: #0d1b2e;
  --blue-800: #0f2347;
  --blue-700: #1a3a6c;
  --blue-600: #1e4fa0;
  --blue-500: #2563eb;
  --blue-400: #3b82f6;
  --blue-300: #60a5fa;
  --blue-200: #93c5fd;
  --cyan-400:  #22d3ee;
  --indigo-500:#6366f1;
  --white:     #ffffff;
  --text-main: #e2e8f0;
  --text-sub:  #94a3b8;
  --text-muted:#64748b;
  --glass-bg:  rgba(255,255,255,0.04);
  --glass-border: rgba(255,255,255,0.09);
  --card-bg:   rgba(15,35,71,0.7);
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-blue: 0 0 40px rgba(37,99,235,0.2);
  --transition: 0.35s cubic-bezier(0.4,0,0.2,1);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--blue-900);
  color: var(--text-main);
  line-height: 1.7;
  overflow-x: hidden;
}

/* ── 背景粒子 ── */
.bg-particles {
  position: fixed; inset: 0; pointer-events: none; z-index: 0;
  background:
    radial-gradient(ellipse 80% 50% at 10% 20%, rgba(37,99,235,0.12) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 90% 80%, rgba(99,102,241,0.10) 0%, transparent 60%);
}

/* ── 通用容器 ── */
.section-container, .nav-container, .footer-container {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
}

/* =====================================================
   导航栏
   ===================================================== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 0 0;
  background: rgba(13,27,46,0.75);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--glass-border);
  transition: var(--transition);
}
.navbar.scrolled {
  background: rgba(13,27,46,0.92);
  box-shadow: 0 4px 32px rgba(0,0,0,0.3);
}
.nav-container {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.nav-logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 1.1rem; font-weight: 700; color: var(--white);
  text-decoration: none;
}
.logo-icon { color: var(--blue-400); font-size: 1.3rem; }
.nav-links { display: flex; gap: 8px; }
.nav-link {
  padding: 6px 16px; border-radius: 8px;
  color: var(--text-sub); font-size: 0.9rem; font-weight: 500;
  text-decoration: none; transition: var(--transition);
}
.nav-link:hover, .nav-link.active {
  color: var(--white); background: rgba(37,99,235,0.2);
}
.nav-toggle {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 4px;
}
.nav-toggle span {
  display: block; width: 24px; height: 2px;
  background: var(--text-sub); border-radius: 2px;
  transition: var(--transition);
}

/* =====================================================
   英雄区
   ===================================================== */
.hero {
  min-height: 100vh;
  display: flex; align-items: center;
  padding: 100px 24px 60px;
  max-width: 1200px; margin: 0 auto;
  gap: 48px;
  position: relative; z-index: 1;
}
.hero-content { flex: 1; }
.hero-label {
  display: inline-block;
  font-size: 0.8rem; font-weight: 500; letter-spacing: 0.15em;
  color: var(--blue-300); text-transform: uppercase;
  background: rgba(37,99,235,0.12);
  border: 1px solid rgba(37,99,235,0.3);
  padding: 4px 14px; border-radius: 20px;
  margin-bottom: 20px;
}
.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 700; line-height: 1.2;
  margin-bottom: 20px; color: var(--white);
}
.gradient-text {
  background: linear-gradient(135deg, var(--blue-400), var(--cyan-400));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: 1.05rem; color: var(--text-sub);
  margin-bottom: 36px; max-width: 480px;
}
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 48px; }

/* 按钮 */
.btn {
  padding: 12px 28px; border-radius: 10px;
  font-size: 0.95rem; font-weight: 600;
  text-decoration: none; transition: var(--transition);
  display: inline-flex; align-items: center; gap: 8px;
}
.btn-primary {
  background: linear-gradient(135deg, var(--blue-600), var(--blue-500));
  color: var(--white);
  box-shadow: 0 4px 20px rgba(37,99,235,0.4);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(37,99,235,0.5);
}
.btn-outline {
  border: 1.5px solid rgba(37,99,235,0.5);
  color: var(--blue-300);
  background: transparent;
}
.btn-outline:hover {
  background: rgba(37,99,235,0.1);
  border-color: var(--blue-400);
  transform: translateY(-2px);
}

/* 英雄统计 */
.hero-stats { display: flex; gap: 36px; }
.stat-item { display: flex; flex-direction: column; }
.stat-num { font-size: 1.8rem; font-weight: 700; color: var(--white); line-height: 1.1; }
.stat-label { font-size: 0.8rem; color: var(--text-muted); margin-top: 2px; }

/* 英雄视觉区 */
.hero-visual {
  flex: 0 0 420px; position: relative; height: 420px;
}
.hero-circle {
  width: 300px; height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(37,99,235,0.25), rgba(13,27,46,0.3));
  border: 1px solid rgba(37,99,235,0.25);
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 0 80px rgba(37,99,235,0.15);
  animation: pulse-ring 4s ease-in-out infinite;
}
.circle-inner {
  width: 180px; height: 180px; border-radius: 50%;
  background: linear-gradient(135deg, rgba(37,99,235,0.4), rgba(99,102,241,0.3));
  border: 1px solid rgba(37,99,235,0.4);
  display: flex; align-items: center; justify-content: center;
}
.circle-icon { font-size: 3rem; color: var(--blue-300); }

.float-card {
  position: absolute;
  background: var(--card-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(12px);
  border-radius: var(--radius-md);
  padding: 12px 18px;
  display: flex; align-items: center; gap: 10px;
  font-size: 0.85rem; font-weight: 500; color: var(--text-main);
  box-shadow: var(--shadow-blue);
}
.card-icon { font-size: 1.2rem; }
.card-1 { top: 30px; left: 10px; animation: float 3s ease-in-out infinite; }
.card-2 { top: 50%; right: 0; transform: translateY(-50%); animation: float 3s ease-in-out 1s infinite; }
.card-3 { bottom: 30px; left: 30px; animation: float 3s ease-in-out 2s infinite; }

@keyframes float {
  0%,100% { transform: translateY(0); }
  50%      { transform: translateY(-10px); }
}
.card-2 { animation: float2 3s ease-in-out 1s infinite; }
@keyframes float2 {
  0%,100% { transform: translateY(-50%); }
  50%      { transform: translateY(calc(-50% - 10px)); }
}
@keyframes pulse-ring {
  0%,100% { box-shadow: 0 0 60px rgba(37,99,235,0.12); }
  50%      { box-shadow: 0 0 100px rgba(37,99,235,0.25); }
}

/* =====================================================
   通用 Section 样式
   ===================================================== */
.section { padding: 100px 0; position: relative; z-index: 1; }
.section-header { text-align: center; margin-bottom: 60px; }
.section-tag {
  font-size: 0.75rem; font-weight: 600; letter-spacing: 0.2em;
  color: var(--blue-400); text-transform: uppercase;
  margin-bottom: 12px;
}
.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700; color: var(--white);
  margin-bottom: 14px;
}
.section-desc { color: var(--text-sub); font-size: 1rem; }

/* =====================================================
   练习作品区
   ===================================================== */
.works-section { background: rgba(255,255,255,0.015); }

.works-filter {
  display: flex; justify-content: center; gap: 10px;
  flex-wrap: wrap; margin-bottom: 44px;
}
.filter-btn {
  padding: 8px 22px; border-radius: 8px;
  border: 1px solid var(--glass-border);
  background: transparent; color: var(--text-sub);
  font-size: 0.875rem; font-weight: 500; cursor: pointer;
  transition: var(--transition);
}
.filter-btn.active, .filter-btn:hover {
  background: rgba(37,99,235,0.2);
  border-color: rgba(37,99,235,0.5);
  color: var(--blue-300);
}

.works-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}
.work-card {
  background: var(--card-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}
.work-card:hover {
  transform: translateY(-6px);
  border-color: rgba(37,99,235,0.4);
  box-shadow: 0 16px 48px rgba(0,0,0,0.3), 0 0 0 1px rgba(37,99,235,0.2);
}
.work-card.hidden { display: none; }
.work-thumb {
  height: 180px; position: relative;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
}
.work-thumb-pattern {
  position: absolute; inset: 0;
  background-image:
    radial-gradient(circle at 30% 30%, rgba(255,255,255,0.06) 1px, transparent 1px),
    radial-gradient(circle at 70% 70%, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 30px 30px;
}
.work-thumb-icon { font-size: 3rem; position: relative; z-index: 1; }
.work-info { padding: 20px 24px 24px; }
.work-tag {
  display: inline-block;
  font-size: 0.75rem; font-weight: 600;
  color: var(--blue-300); background: rgba(37,99,235,0.12);
  border: 1px solid rgba(37,99,235,0.25);
  padding: 3px 10px; border-radius: 6px;
  margin-bottom: 10px;
}
.work-info h3 { font-size: 1.05rem; font-weight: 600; margin-bottom: 8px; color: var(--white); }
.work-info p { font-size: 0.875rem; color: var(--text-sub); line-height: 1.6; }

/* =====================================================
   技能区
   ===================================================== */
.skills-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(260px,1fr));
  gap: 24px; margin-bottom: 60px;
}
.skill-block {
  padding: 28px; border-radius: var(--radius-lg);
  background: var(--card-bg);
  border: 1px solid var(--glass-border);
  transition: var(--transition);
}
.skill-block:hover {
  transform: translateY(-4px);
  border-color: rgba(37,99,235,0.35);
}
.skill-icon-wrap {
  width: 52px; height: 52px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; margin-bottom: 18px;
}
.skill-block h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 10px; }
.skill-block p { font-size: 0.875rem; color: var(--text-sub); margin-bottom: 16px; }
.skill-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.skill-tags span {
  font-size: 0.75rem; padding: 4px 12px; border-radius: 6px;
  background: rgba(37,99,235,0.1); color: var(--blue-300);
  border: 1px solid rgba(37,99,235,0.2);
}

/* 进度条 */
.progress-area { max-width: 640px; margin: 0 auto; display: flex; flex-direction: column; gap: 22px; }
.progress-header { display: flex; justify-content: space-between; font-size: 0.875rem; margin-bottom: 8px; color: var(--text-sub); }
.progress-bar {
  height: 6px; background: rgba(255,255,255,0.06);
  border-radius: 3px; overflow: hidden;
}
.progress-fill {
  height: 100%; width: 0; border-radius: 3px;
  background: linear-gradient(90deg, var(--blue-600), var(--blue-400), var(--cyan-400));
  transition: width 1.2s cubic-bezier(0.4,0,0.2,1);
}

/* =====================================================
   关于区
   ===================================================== */
.about-section { background: rgba(255,255,255,0.015); }
.about-split { display: flex; align-items: center; gap: 80px; }
.about-visual {
  flex: 0 0 280px; position: relative;
  display: flex; align-items: center; justify-content: center; height: 280px;
}
.about-avatar {
  width: 200px; height: 200px; border-radius: 50%;
  background: linear-gradient(135deg, rgba(37,99,235,0.3), rgba(99,102,241,0.2));
  border: 2px solid rgba(37,99,235,0.3);
  display: flex; align-items: center; justify-content: center;
  font-size: 4rem;
  box-shadow: 0 0 60px rgba(37,99,235,0.2);
}
.about-badge {
  position: absolute;
  background: var(--card-bg); border: 1px solid var(--glass-border);
  border-radius: 10px; padding: 8px 16px;
  font-size: 0.8rem; font-weight: 600; color: var(--blue-300);
  backdrop-filter: blur(12px);
}
.badge-1 { top: 20px; right: 0; animation: float 3s ease-in-out infinite; }
.badge-2 { bottom: 20px; left: 0; animation: float 3s ease-in-out 1.5s infinite; }

.about-text { flex: 1; }
.about-desc { color: var(--text-sub); margin-bottom: 16px; }
.about-info { display: flex; flex-direction: column; gap: 16px; margin-top: 24px; }
.info-item { display: flex; align-items: center; gap: 14px; }
.info-icon { font-size: 1.3rem; }
.info-label { display: block; font-size: 0.75rem; color: var(--text-muted); }
.info-val { font-size: 0.95rem; font-weight: 500; color: var(--text-main); }

/* =====================================================
   页脚
   ===================================================== */
.footer {
  background: rgba(9,18,32,0.9);
  border-top: 1px solid var(--glass-border);
  padding: 40px 0 24px; position: relative; z-index: 1;
}
.footer-top { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; margin-bottom: 24px; }
.footer-brand { display: flex; align-items: center; gap: 10px; font-size: 1rem; font-weight: 700; color: var(--white); }
.footer-slogan { color: var(--text-muted); font-size: 0.875rem; }
.footer-divider { height: 1px; background: var(--glass-border); margin-bottom: 20px; }
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 12px;
}
.footer-copy { font-size: 0.825rem; color: var(--text-muted); }
.footer-icp a {
  font-size: 0.825rem; color: var(--text-muted);
  text-decoration: none; transition: color 0.2s;
}
.footer-icp a:hover { color: var(--blue-300); }

/* =====================================================
   响应式
   ===================================================== */
@media (max-width: 900px) {
  .hero { flex-direction: column; padding-top: 90px; text-align: center; }
  .hero-desc { margin-left: auto; margin-right: auto; }
  .hero-btns, .hero-stats { justify-content: center; }
  .hero-visual { flex: none; width: 100%; height: 300px; }
  .about-split { flex-direction: column; gap: 40px; }
  .about-text { text-align: center; }
  .about-info { align-items: center; }
  .section-title { text-align: center !important; }
}
@media (max-width: 640px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .nav-links.open {
    display: flex; flex-direction: column;
    position: absolute; top: 64px; left: 0; right: 0;
    background: rgba(13,27,46,0.97);
    border-bottom: 1px solid var(--glass-border);
    padding: 16px 24px;
  }
  .works-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 24px; }
  .about-visual { flex: none; }
}