/* ====== 重置 & 变量 ====== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  /* 深色主题（默认） */
  --bg: #0d1117;
  --bg-alt: #161b22;
  --bg-card: #1c2330;
  --text: #e6edf3;
  --text-dim: #8b949e;
  --text-muted: #6e7681;
  --border: #30363d;
  --accent: #6c5ce7;
  --accent-2: #00d2ff;
  --accent-grad: linear-gradient(135deg, #6c5ce7 0%, #00d2ff 100%);
  --accent-grad-hover: linear-gradient(135deg, #7d6df7 0%, #10e2ff 100%);
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 12px 40px rgba(108, 92, 231, 0.25);
  --radius: 16px;
  --radius-sm: 10px;
  --max-width: 1100px;
  --nav-height: 64px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  --bg: #f6f8fa;
  --bg-alt: #ffffff;
  --bg-card: #ffffff;
  --text: #1f2328;
  --text-dim: #59636e;
  --text-muted: #818b96;
  --border: #d0d7de;
  --accent: #6c5ce7;
  --accent-2: #0099cc;
  --accent-grad: linear-gradient(135deg, #6c5ce7 0%, #0099cc 100%);
  --accent-grad-hover: linear-gradient(135deg, #7d6df7 0%, #10aadd 100%);
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 8px 30px rgba(108, 92, 231, 0.15);
}

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: 1.7;
  overflow-x: hidden;
  transition: background var(--transition), color var(--transition);
}

a { color: inherit; text-decoration: none; }

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* ====== 导航栏 ====== */
#navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-height);
  background: rgba(13, 17, 23, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), border-color var(--transition);
}
[data-theme="light"] #navbar { background: rgba(255, 255, 255, 0.85); }

.nav-container {
  max-width: var(--max-width); margin: 0 auto; padding: 0 24px;
  height: 100%; display: flex; align-items: center; justify-content: space-between;
}

.nav-logo {
  font-size: 20px; font-weight: 800; letter-spacing: -0.5px;
  background: var(--accent-grad); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text;
}
.nav-logo span { -webkit-text-fill-color: var(--text-muted); }

.nav-links { display: flex; gap: 4px; }

.nav-link {
  padding: 8px 16px; border-radius: 8px; font-size: 14px; font-weight: 500;
  color: var(--text-dim); transition: all var(--transition); cursor: pointer;
}
.nav-link:hover { color: var(--text); background: var(--bg-alt); }
.nav-link.active { color: var(--accent); background: rgba(108, 92, 231, 0.1); }

.theme-toggle {
  background: none; border: none; cursor: pointer; font-size: 20px;
  padding: 8px; border-radius: 8px; transition: all var(--transition);
}
.theme-toggle:hover { background: var(--bg-alt); }
.theme-icon-light { display: none; }
[data-theme="light"] .theme-icon-dark { display: none; }
[data-theme="light"] .theme-icon-light { display: inline; }

.nav-hamburger {
  display: none; flex-direction: column; gap: 4px;
  background: none; border: none; cursor: pointer; padding: 8px;
}
.nav-hamburger span {
  width: 22px; height: 2px; background: var(--text); border-radius: 2px;
  transition: all var(--transition);
}
.nav-hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(4px, 4px); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(4px, -4px); }

/* ====== Hero 首页 ====== */
.hero {
  min-height: 100vh; display: flex; flex-direction: column;
  align-items: center; justify-content: center; text-align: center;
  position: relative; overflow: hidden; padding: 80px 24px 40px;
}
.hero-bg {
  position: absolute; top: 0; left: 0; right: 0; bottom: 0; z-index: 0;
  background: radial-gradient(ellipse at 20% 30%, rgba(108, 92, 231, 0.15) 0%, transparent 50%),
              radial-gradient(ellipse at 80% 70%, rgba(0, 210, 255, 0.1) 0%, transparent 50%);
}
.hero-content { position: relative; z-index: 1; max-width: 700px; }

.hero-avatar {
  width: 100px; height: 100px; margin: 0 auto 24px;
  font-size: 48px; display: flex; align-items: center; justify-content: center;
  border-radius: 50%; background: var(--bg-card); border: 2px solid var(--border);
  box-shadow: var(--shadow);
}

.hero-name {
  font-size: clamp(36px, 6vw, 56px); font-weight: 900; letter-spacing: -1px;
  background: var(--accent-grad); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text;
  margin-bottom: 12px;
}
.hero-title { font-size: clamp(15px, 2.5vw, 19px); color: var(--text-dim); margin-bottom: 28px; }

.hero-tags { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-bottom: 36px; }
.tag {
  padding: 6px 16px; font-size: 13px; font-weight: 600; border-radius: 20px;
  background: var(--bg-card); border: 1px solid var(--border); color: var(--text-dim);
  transition: all var(--transition);
}
.tag:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }

.hero-cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.btn {
  padding: 12px 32px; border-radius: 12px; font-size: 15px; font-weight: 700;
  transition: all var(--transition); cursor: pointer; border: none;
}
.btn-primary { background: var(--accent-grad); color: #fff; }
.btn-primary:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.btn-outline { background: transparent; color: var(--text); border: 2px solid var(--border); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-3px); }

.scroll-hint {
  position: absolute; bottom: 30px; left: 50%; transform: translateX(-50%);
  font-size: 13px; color: var(--text-muted); animation: bounce 2s infinite; z-index: 1;
}
@keyframes bounce { 0%,100%{ transform: translateX(-50%) translateY(0); } 50%{ transform: translateX(-50%) translateY(8px); } }

/* ====== 通用 Section ====== */
.section { padding: 100px 0; }
.section-alt { background: var(--bg-alt); }

.section-title {
  font-size: clamp(26px, 4vw, 36px); font-weight: 800; text-align: center;
  margin-bottom: 12px; letter-spacing: -0.5px;
}
.section-desc { text-align: center; color: var(--text-dim); margin-bottom: 48px; font-size: 15px; }

/* ====== 关于我 ====== */
.about-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 48px; align-items: start; }
.about-text p { margin-bottom: 16px; color: var(--text-dim); font-size: 16px; }
.about-text strong { color: var(--text); }

.about-skills h3 { font-size: 18px; margin-bottom: 20px; color: var(--text); }
.skill-item { margin-bottom: 18px; }
.skill-name { display: block; font-size: 13px; font-weight: 600; color: var(--text-dim); margin-bottom: 6px; }
.skill-bar { height: 8px; background: var(--bg-alt); border-radius: 4px; overflow: hidden; border: 1px solid var(--border); }
.skill-fill {
  height: 100%; border-radius: 4px; background: var(--accent-grad);
  transition: width 1s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ====== 项目卡片 ====== */
.project-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 24px; }
.project-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; transition: all var(--transition); display: flex; flex-direction: column;
}
.project-card:hover { transform: translateY(-6px); border-color: var(--accent); box-shadow: var(--shadow-hover); }
.project-cover {
  height: 180px; display: flex; align-items: center; justify-content: center;
  font-size: 48px; position: relative; overflow: hidden;
}
.project-cover::before { content: ""; position: absolute; inset: 0; opacity: 0.8; }
.project-cover.harmony::before { background: linear-gradient(135deg, #0a4d8c, #00a8ff); }
.project-cover.ruoyi::before { background: linear-gradient(135deg, #1a5129, #2d9d46); }
.project-cover.web::before { background: linear-gradient(135deg, #4a148c, #9c27b0); }
.project-cover span { position: relative; z-index: 1; filter: drop-shadow(0 2px 4px rgba(0,0,0,0.3)); }
.project-body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
.project-body h3 { font-size: 18px; margin-bottom: 8px; }
.project-body p { font-size: 14px; color: var(--text-dim); margin-bottom: 16px; flex: 1; }
.project-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 16px; }
.project-tag { font-size: 11px; padding: 3px 10px; border-radius: 12px; background: var(--bg-alt); color: var(--text-muted); }
.project-links { display: flex; gap: 12px; }
.project-link { font-size: 14px; font-weight: 600; display: flex; align-items: center; gap: 6px; transition: color var(--transition); }
.project-link:hover { color: var(--accent); }

/* ====== 资源 / AI 工具 ====== */
.resource-categories { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 28px; }
.resource-category h3 {
  font-size: 16px; margin-bottom: 16px; padding-bottom: 10px;
  border-bottom: 2px solid var(--border); display: flex; align-items: center; gap: 8px;
}
.resource-category h3 .icon { font-size: 20px; }
.resource-list { list-style: none; }
.resource-item {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 0; border-bottom: 1px solid transparent; transition: all var(--transition);
}
.resource-item:hover { border-bottom-color: var(--border); padding-left: 8px; }
.resource-item a { display: flex; align-items: center; gap: 8px; font-size: 14px; color: var(--text-dim); transition: color var(--transition); }
.resource-item a:hover { color: var(--accent); }
.resource-item .ext { font-size: 12px; color: var(--text-muted); }

/* ====== 联系 ====== */
.contact-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px; max-width: 700px; margin: 0 auto; }
.contact-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 32px 24px; text-align: center; transition: all var(--transition);
}
.contact-card:hover { transform: translateY(-4px); border-color: var(--accent); box-shadow: var(--shadow-hover); }
.contact-icon { font-size: 36px; margin-bottom: 12px; }
.contact-card h3 { font-size: 16px; margin-bottom: 4px; }
.contact-card p { font-size: 14px; color: var(--text-dim); }

/* ====== Footer ====== */
footer {
  background: var(--bg-alt); border-top: 1px solid var(--border);
  padding: 40px 0; text-align: center;
}
footer p { font-size: 14px; color: var(--text-muted); }
.footer-links { margin-top: 8px; }
.footer-links a { color: var(--accent); }
.footer-links a:hover { text-decoration: underline; }

/* ====== 滚动动画 ====== */
.fade-in { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ====== 响应式 ====== */
@media (max-width: 768px) {
  .nav-links {
    position: fixed; top: var(--nav-height); left: 0; right: 0;
    flex-direction: column; background: var(--bg-card); border-bottom: 1px solid var(--border);
    padding: 16px; gap: 4px; transform: translateY(-200%); transition: transform var(--transition);
  }
  .nav-links.open { transform: translateY(0); }
  .nav-hamburger { display: flex; }
  .about-grid { grid-template-columns: 1fr; gap: 32px; }
  .section { padding: 64px 0; }
  .hero { min-height: 90vh; }
}