/* ==========================================================================
   程亚飞个人品牌网站 - 全局设计系统
   设计灵感：trae.cn 深色沉浸 · 紧凑网格 · 克制留白 · 像素科技感
   配色：深蓝灰 #0f172a · 科技蓝 #3b82f6 · 点缀金 #f59e0b
   字体：Noto Sans SC（中）/ Inter（英）
   ========================================================================== */

/* ---------- 1. 设计令牌（CSS 变量） ---------- */
:root {
  /* 主色调 */
  --c-bg: #0f172a;
  --c-bg-soft: #131c31;
  --c-surface: #1a2440;
  --c-surface-2: #212d50;
  --c-border: rgba(148, 163, 184, 0.14);
  --c-border-strong: rgba(148, 163, 184, 0.28);

  /* 文字色 */
  --c-text: #f1f5f9;
  --c-text-muted: #94a3b8;
  --c-text-subtle: #64748b;

  /* 品牌色 */
  --c-primary: #3b82f6;
  --c-primary-soft: rgba(59, 130, 246, 0.14);
  --c-primary-glow: rgba(59, 130, 246, 0.45);
  --c-accent: #f59e0b;
  --c-accent-soft: rgba(245, 158, 11, 0.14);

  /* 功能色 */
  --c-cyan: #06b6d4;
  --c-violet: #8b5cf6;

  /* 字体 */
  --font-sans: "Inter", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "SFMono-Regular", Menlo, monospace;
  --font-display: "Inter", "Noto Sans SC", sans-serif;

  /* 间距 */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* 圆角 */
  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 999px;

  /* 阴影 */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow: 0 4px 16px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 40px rgba(59, 130, 246, 0.18);

  /* 布局 */
  --container: 1200px;
  --container-narrow: 880px;
  --nav-h: 68px;

  /* 动效 */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --dur: 0.4s;
  --dur-fast: 0.2s;
}

/* 浅色主题 */
[data-theme="light"] {
  --c-bg: #f7f8fb;
  --c-bg-soft: #ffffff;
  --c-surface: #ffffff;
  --c-surface-2: #f1f4f9;
  --c-border: rgba(15, 23, 42, 0.10);
  --c-border-strong: rgba(15, 23, 42, 0.18);

  --c-text: #0f172a;
  --c-text-muted: #475569;
  --c-text-subtle: #64748b;

  --c-primary-soft: rgba(59, 130, 246, 0.10);
  --c-accent-soft: rgba(245, 158, 11, 0.12);

  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow: 0 4px 16px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 16px 48px rgba(15, 23, 42, 0.12);
  --shadow-glow: 0 0 40px rgba(59, 130, 246, 0.12);
}

/* ---------- 2. 基础重置 ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
html[lang] { font-size: 16px; }
body {
  font-family: var(--font-sans);
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.65;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}
img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
ul, ol { list-style: none; }
input, textarea, select { font-family: inherit; font-size: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--c-primary); outline-offset: 2px; border-radius: 4px; }
::selection { background: var(--c-primary); color: #fff; }

/* 滚动条 */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--c-bg); }
::-webkit-scrollbar-thumb { background: var(--c-border-strong); border-radius: 8px; border: 2px solid var(--c-bg); }
::-webkit-scrollbar-thumb:hover { background: var(--c-text-subtle); }

/* ---------- 3. 排版 ---------- */
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 700; line-height: 1.2; letter-spacing: -0.02em; }
h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); }
h2 { font-size: clamp(1.7rem, 3.5vw, 2.4rem); }
h3 { font-size: clamp(1.25rem, 2.2vw, 1.5rem); }
h4 { font-size: 1.125rem; }
p { color: var(--c-text-muted); }
.lead { font-size: 1.15rem; color: var(--c-text-muted); line-height: 1.7; }

/* 渐变文字 */
.text-gradient {
  background: linear-gradient(135deg, #fff 0%, #93c5fd 60%, #3b82f6 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
[data-theme="light"] .text-gradient {
  background: linear-gradient(135deg, #0f172a 0%, #1d4ed8 60%, #2563eb 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.text-accent { color: var(--c-accent); }
.text-primary { color: var(--c-primary); }

/* ---------- 4. 布局工具 ---------- */
.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 var(--space-6); }
.container-narrow { max-width: var(--container-narrow); margin: 0 auto; padding: 0 var(--space-6); }
.section { padding: var(--space-24) 0; position: relative; }
.section-sm { padding: var(--space-16) 0; }
.grid { display: grid; gap: var(--space-6); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 960px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

/* ---------- 5. 区块头 ---------- */
.section-head { max-width: 720px; margin-bottom: var(--space-12); }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-family: var(--font-mono); font-size: 0.78rem; font-weight: 500;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--c-primary);
  padding: 0.3rem 0.8rem; border: 1px solid var(--c-border-strong);
  border-radius: var(--radius-full); background: var(--c-primary-soft);
  margin-bottom: var(--space-4);
}
.eyebrow::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--c-primary); box-shadow: 0 0 8px var(--c-primary-glow); }
.section-head h2 { margin-bottom: var(--space-3); }
.section-head p { font-size: 1.05rem; }

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  padding: 0.85rem 1.6rem; border-radius: var(--radius-full);
  font-weight: 600; font-size: 0.95rem; letter-spacing: -0.01em;
  transition: all var(--dur) var(--ease);
  position: relative; overflow: hidden; white-space: nowrap;
  min-height: 48px;
}
.btn-primary {
  background: var(--c-primary); color: #fff;
  box-shadow: 0 4px 20px var(--c-primary-glow);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px var(--c-primary-glow); }
.btn-accent { background: var(--c-accent); color: #0f172a; box-shadow: 0 4px 20px rgba(245, 158, 11, 0.35); }
.btn-accent:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(245, 158, 11, 0.5); }
.btn-ghost { background: var(--c-surface); color: var(--c-text); border: 1px solid var(--c-border-strong); }
.btn-ghost:hover { border-color: var(--c-primary); background: var(--c-primary-soft); color: var(--c-primary); }
.btn-lg { padding: 1rem 2rem; font-size: 1rem; }
.btn svg { width: 18px; height: 18px; }

/* ---------- 7. 卡片 ---------- */
.card {
  background: var(--c-surface); border: 1px solid var(--c-border);
  border-radius: var(--radius-lg); padding: var(--space-8);
  transition: all var(--dur) var(--ease); position: relative; overflow: hidden;
}
.card:hover { border-color: var(--c-border-strong); transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.card-glow::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(600px circle at var(--mx, 50%) var(--my, 50%), var(--c-primary-soft), transparent 40%);
  opacity: 0; transition: opacity var(--dur) var(--ease); pointer-events: none;
}
.card-glow:hover::before { opacity: 1; }

/* 占位符（图片未替换时显示） */
.placeholder {
  background:
    linear-gradient(135deg, var(--c-surface) 0%, var(--c-surface-2) 100%);
  border: 1px dashed var(--c-border-strong);
  display: flex; align-items: center; justify-content: center;
  color: var(--c-text-subtle); font-size: 0.85rem; position: relative; overflow: hidden;
}
.placeholder::after {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--c-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--c-border) 1px, transparent 1px);
  background-size: 24px 24px; opacity: 0.5;
}
.placeholder > * { position: relative; z-index: 1; }

/* ---------- 8. 标签 / 徽章 ---------- */
.tag {
  display: inline-flex; align-items: center; gap: 0.35rem;
  font-size: 0.78rem; font-weight: 500; padding: 0.3rem 0.7rem;
  border-radius: var(--radius-full); background: var(--c-surface-2);
  color: var(--c-text-muted); border: 1px solid var(--c-border);
  transition: all var(--dur-fast) var(--ease);
}
.tag.tag-primary { background: var(--c-primary-soft); color: var(--c-primary); border-color: transparent; }
.tag.tag-accent { background: var(--c-accent-soft); color: var(--c-accent); border-color: transparent; }
.tag.is-filter { cursor: pointer; }
.tag.is-filter:hover { border-color: var(--c-primary); color: var(--c-primary); }
.tag.is-filter.active { background: var(--c-primary); color: #fff; border-color: var(--c-primary); }

/* ---------- 9. 导航栏 ---------- */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; height: var(--nav-h);
  z-index: 100; display: flex; align-items: center;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease), backdrop-filter var(--dur);
}
.navbar.scrolled {
  background: rgba(15, 23, 42, 0.72);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--c-border);
}
[data-theme="light"] .navbar.scrolled { background: rgba(255, 255, 255, 0.78); }
.navbar.hidden { transform: translateY(-100%); }
.nav-inner { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 var(--space-6); display: flex; align-items: center; justify-content: space-between; gap: var(--space-6); }
.nav-brand { display: flex; align-items: center; gap: 0.6rem; font-weight: 700; font-size: 1.05rem; letter-spacing: -0.02em; }
.nav-brand .logo-mark {
  width: 32px; height: 32px; border-radius: 8px;
  background: linear-gradient(135deg, var(--c-primary), var(--c-violet));
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-size: 0.85rem; font-weight: 700; color: #fff;
  box-shadow: 0 4px 14px var(--c-primary-glow);
}
.nav-brand .brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.nav-brand .brand-text small { font-size: 0.7rem; font-weight: 500; color: var(--c-text-subtle); letter-spacing: 0.05em; }

.nav-links { display: flex; align-items: center; gap: 0.25rem; }
.nav-link {
  position: relative; padding: 0.5rem 0.9rem; border-radius: var(--radius);
  font-size: 0.92rem; font-weight: 500; color: var(--c-text-muted);
  transition: color var(--dur-fast) var(--ease);
}
.nav-link:hover { color: var(--c-text); }
.nav-link.active { color: var(--c-text); }
.nav-link.active::after {
  content: ""; position: absolute; bottom: -2px; left: 50%; transform: translateX(-50%);
  width: 18px; height: 2px; border-radius: 2px; background: var(--c-primary);
  box-shadow: 0 0 8px var(--c-primary-glow);
}

.nav-actions { display: flex; align-items: center; gap: 0.5rem; }
.icon-btn {
  width: 40px; height: 40px; border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  color: var(--c-text-muted); border: 1px solid var(--c-border);
  background: var(--c-surface); transition: all var(--dur-fast) var(--ease);
}
.icon-btn:hover { color: var(--c-text); border-color: var(--c-border-strong); transform: translateY(-1px); }
.icon-btn svg { width: 18px; height: 18px; }
.lang-btn {
  padding: 0 0.85rem; font-weight: 600; font-size: 0.82rem;
  font-family: var(--font-mono); letter-spacing: 0.04em;
}
.lang-btn:hover { color: var(--c-primary); border-color: var(--c-primary); }

.nav-toggle { display: none; }

/* 移动端 */
@media (max-width: 860px) {
  .nav-links {
    position: fixed; top: var(--nav-h); left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: rgba(15, 23, 42, 0.96); backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--c-border);
    padding: var(--space-4); transform: translateY(-120%); opacity: 0;
    transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
    max-height: calc(100vh - var(--nav-h)); overflow-y: auto;
  }
  [data-theme="light"] .nav-links { background: rgba(255,255,255,0.97); }
  .nav-links.open { transform: translateY(0); opacity: 1; }
  .nav-link { padding: 0.9rem 1rem; border-radius: var(--radius); font-size: 1rem; }
  .nav-link.active { background: var(--c-primary-soft); }
  .nav-link.active::after { display: none; }
  .nav-toggle { display: flex; }
}

/* ---------- 10. 页脚 ---------- */
.footer {
  border-top: 1px solid var(--c-border);
  background: var(--c-bg-soft); padding: var(--space-16) 0 var(--space-8);
  margin-top: var(--space-24);
}
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: var(--space-12); margin-bottom: var(--space-12); }
@media (max-width: 720px) { .footer-grid { grid-template-columns: 1fr; gap: var(--space-8); } }
.footer-brand .nav-brand { margin-bottom: var(--space-4); }
.footer-tagline { color: var(--c-text-muted); font-size: 0.95rem; max-width: 340px; line-height: 1.7; }
.footer-col h4 { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--c-text-subtle); margin-bottom: var(--space-4); font-weight: 600; }
.footer-col ul li { margin-bottom: 0.6rem; }
.footer-col a { color: var(--c-text-muted); font-size: 0.95rem; transition: color var(--dur-fast); }
.footer-col a:hover { color: var(--c-primary); }
.footer-social { display: flex; gap: 0.6rem; margin-top: var(--space-4); }
.footer-social a { width: 40px; height: 40px; }
.footer-bottom { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: var(--space-3); padding-top: var(--space-6); border-top: 1px solid var(--c-border); color: var(--c-text-subtle); font-size: 0.85rem; }

/* ---------- 11. 通用动画 ---------- */
@keyframes fadeUp { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.5; } }
@keyframes shimmer { 0% { background-position: -200% 0; } 100% { background-position: 200% 0; } }
@keyframes spin { to { transform: rotate(360deg); } }

.reveal { opacity: 0; }
.reveal.in { animation: fadeUp 0.7s var(--ease-out) forwards; }
.reveal[data-delay="1"] { animation-delay: 0.1s; }
.reveal[data-delay="2"] { animation-delay: 0.2s; }
.reveal[data-delay="3"] { animation-delay: 0.3s; }
.reveal[data-delay="4"] { animation-delay: 0.4s; }
.reveal[data-delay="5"] { animation-delay: 0.5s; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1; }
}

/* ---------- 12. 工具类 ---------- */
.text-center { text-align: center; }
.text-muted { color: var(--c-text-muted); }
.text-subtle { color: var(--c-text-subtle); }
.mt-2 { margin-top: var(--space-2); } .mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); } .mt-8 { margin-top: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }
.mb-2 { margin-bottom: var(--space-2); } .mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); } .mb-8 { margin-bottom: var(--space-8); }
.mb-12 { margin-bottom: var(--space-12); }
.flex { display: flex; } .items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); } .gap-4 { gap: var(--space-4); } .gap-6 { gap: var(--space-6); }
.flex-wrap { flex-wrap: wrap; }
.full-bleed { width: 100%; }
.divider { height: 1px; background: var(--c-border); border: none; margin: var(--space-8) 0; }

/* 回到顶部 */
.back-to-top {
  position: fixed; bottom: var(--space-6); right: var(--space-6);
  width: 48px; height: 48px; border-radius: var(--radius-full);
  background: var(--c-surface); border: 1px solid var(--c-border-strong);
  display: flex; align-items: center; justify-content: center;
  color: var(--c-text-muted); z-index: 90;
  opacity: 0; pointer-events: none; transform: translateY(12px);
  transition: all var(--dur) var(--ease);
  box-shadow: var(--shadow);
}
.back-to-top.show { opacity: 1; pointer-events: auto; transform: translateY(0); }
.back-to-top:hover { color: var(--c-primary); border-color: var(--c-primary); }

/* 公告横幅 */
.announce {
  display: flex; align-items: center; gap: 0.75rem; justify-content: center;
  padding: 0.7rem var(--space-6); font-size: 0.88rem;
  background: linear-gradient(90deg, var(--c-primary-soft), var(--c-accent-soft), var(--c-primary-soft));
  background-size: 200% 100%; animation: shimmer 8s linear infinite;
  border-bottom: 1px solid var(--c-border); color: var(--c-text);
}
.announce .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--c-accent); box-shadow: 0 0 10px var(--c-accent); animation: pulse 1.6s ease infinite; flex-shrink: 0; }

/* 网格背景纹理 */
.grid-bg {
  position: absolute; inset: 0; pointer-events: none; opacity: 0.4;
  background-image:
    linear-gradient(var(--c-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--c-border) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
}

/* 发光球 */
.glow-orb {
  position: absolute; border-radius: 50%; filter: blur(80px); opacity: 0.5; pointer-events: none;
}

/* 微信二维码弹窗 */
.qr-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur) var(--ease);
}

.qr-modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.qr-modal {
  background: var(--c-surface);
  border: 1px solid var(--c-border-strong);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  text-align: center;
  max-width: 90%;
  width: 320px;
  box-shadow: var(--shadow-lg);
  transform: translateY(20px) scale(0.95);
  transition: transform var(--dur) var(--ease);
}

.qr-modal-overlay.active .qr-modal {
  transform: translateY(0) scale(1);
}

.qr-modal-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-4);
  color: var(--c-text);
}

.qr-modal-image {
  width: 200px;
  height: 200px;
  background: var(--c-bg);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-4);
  border: 2px dashed var(--c-border);
  color: var(--c-text-muted);
}

.qr-modal-close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  background: none;
  border: none;
  color: var(--c-text-muted);
  cursor: pointer;
  padding: var(--space-2);
  font-size: 1.5rem;
  transition: color var(--dur-fast);
}

.qr-modal-close:hover {
  color: var(--c-text);
}

/* 打印样式 */
@media print {
  .navbar, .footer, .back-to-top, .announce, .nav-toggle, .nav-actions, .qr-modal-overlay { display: none !important; }
  body { background: #fff; color: #000; }
  .card { box-shadow: none; border: 1px solid #ccc; break-inside: avoid; }
  .section { padding: 1rem 0; }
}