:root {
  --bg: #0b0f1a;
  --bg-soft: #111827;
  --card: #161f33;
  --card-hover: #1a2440;
  --border: #243049;
  --text: #e5e7eb;
  --text-dim: #9ca3af;
  --accent: #6366f1;
  --accent-2: #22d3ee;
  --shadow: 0 20px 40px rgba(0, 0, 0, 0.35);
  --nav-h: 64px;
}

[data-theme="light"] {
  --bg: #f8fafc;
  --bg-soft: #ffffff;
  --card: #ffffff;
  --card-hover: #f1f5f9;
  --border: #e2e8f0;
  --text: #0f172a;
  --text-dim: #64748b;
  --shadow: 0 20px 40px rgba(15, 23, 42, 0.08);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  transition: background 0.3s ease, color 0.3s ease;
}

::selection {
  background: var(--accent);
  color: #fff;
}

/* ===== 背景装饰 ===== */
.bg-decor {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.35;
  animation: float 14s ease-in-out infinite;
}

.orb-1 {
  width: 480px;
  height: 480px;
  top: -120px;
  right: -100px;
  background: var(--accent);
}

.orb-2 {
  width: 380px;
  height: 380px;
  bottom: -80px;
  left: -120px;
  background: var(--accent-2);
  animation-delay: -7s;
}

@keyframes float {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(30px) scale(1.08); }
}

.grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 56px 56px;
  opacity: 0.15;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 40%, transparent 100%);
}

/* ===== 导航 ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-h);
  z-index: 100;
  backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, background 0.3s;
}

.nav.scrolled {
  border-bottom-color: var(--border);
}

.nav-inner {
  max-width: 1080px;
  margin: 0 auto;
  height: 100%;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  text-decoration: none;
  color: var(--text);
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-dot {
  color: var(--accent-2);
  -webkit-text-fill-color: var(--accent-2);
}

.nav-links {
  display: flex;
  gap: 28px;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-dim);
  font-size: 0.95rem;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--text);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.theme-toggle {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

.theme-toggle:hover {
  border-color: var(--accent);
}

[data-theme="light"] .theme-icon-moon,
.theme-icon-sun {
  display: none;
}

[data-theme="light"] .theme-icon-sun {
  display: inline;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.menu-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text);
  transition: all 0.3s;
}

.menu-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== 通用区块 ===== */
.section {
  padding: 100px 24px;
}

.section-inner {
  max-width: 1080px;
  margin: 0 auto;
}

.section-tag {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--accent);
  margin-bottom: 12px;
  font-family: "SF Mono", "JetBrains Mono", monospace;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 800;
  margin-bottom: 48px;
  position: relative;
}

.section-title::after {
  content: "";
  position: absolute;
  bottom: -10px;
  left: 0;
  width: 48px;
  height: 4px;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

/* ===== Hero ===== */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 100px 24px 60px;
  position: relative;
}

.hero-inner {
  max-width: 760px;
}

.hero-greeting {
  color: var(--text-dim);
  font-size: 1.1rem;
  margin-bottom: 12px;
  letter-spacing: 1px;
}

.hero-name {
  font-size: clamp(3rem, 8vw, 5rem);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 16px;
  background: linear-gradient(90deg, var(--text) 20%, var(--accent) 60%, var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-type {
  font-size: clamp(1.2rem, 3vw, 1.6rem);
  font-weight: 600;
  margin-bottom: 20px;
  min-height: 1.6em;
}

.typed-cursor {
  color: var(--accent);
  animation: blink 0.9s step-end infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

.hero-desc {
  color: var(--text-dim);
  font-size: 1.05rem;
  max-width: 560px;
  margin: 0 auto 36px;
}

.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 12px;
  font-size: 0.98rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all 0.25s;
}

.btn-primary {
  background: linear-gradient(90deg, var(--accent), #4f46e5);
  color: #fff;
  box-shadow: 0 8px 24px rgba(99, 102, 241, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(99, 102, 241, 0.45);
}

.btn-outline {
  border: 1px solid var(--border);
  color: var(--text);
  background: transparent;
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.hero-socials {
  display: flex;
  gap: 24px;
  justify-content: center;
}

.hero-socials a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s;
}

.hero-socials a:hover {
  color: var(--accent);
}

.scroll-hint {
  position: absolute;
  bottom: 28px;
  font-size: 1.6rem;
  color: var(--text-dim);
  text-decoration: none;
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(8px); }
}

/* ===== 关于 ===== */
.about-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 48px;
  align-items: center;
}

.avatar-ring {
  width: 240px;
  height: 240px;
  border-radius: 50%;
  padding: 6px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  margin: 0 auto;
  animation: spin-slow 12s linear infinite;
}

.avatar {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: var(--bg-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3.2rem;
  font-weight: 800;
  color: var(--text);
  animation: spin-slow 12s linear infinite reverse;
}

@keyframes spin-slow {
  to { transform: rotate(360deg); }
}

.about-text p {
  color: var(--text-dim);
  margin-bottom: 16px;
}

.about-text strong {
  color: var(--text);
}

.about-stats {
  display: flex;
  gap: 40px;
  margin-top: 28px;
}

.stat {
  display: flex;
  flex-direction: column;
}

.stat-num {
  font-size: 1.8rem;
  font-weight: 800;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* ===== 技能 ===== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.skill-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  transition: all 0.3s;
}

.skill-card:hover {
  transform: translateY(-4px);
  background: var(--card-hover);
  box-shadow: var(--shadow);
}

.skill-card h3 {
  font-size: 1.1rem;
  margin-bottom: 20px;
}

.skill-card ul {
  list-style: none;
}

.skill-card li {
  margin-bottom: 14px;
  color: var(--text-dim);
  font-size: 0.92rem;
}

.skill-bar {
  display: block;
  position: relative;
  padding-left: 0;
}

.skill-bar::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  height: 5px;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  width: var(--w, 50%);
}

.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.chip-list li {
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  color: var(--text);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.88rem;
  margin-bottom: 0;
}

/* ===== 项目 ===== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.project-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  transition: all 0.3s;
}

.project-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  background: var(--card-hover);
}

.project-cover {
  height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  font-weight: 900;
  color: #fff;
  background: linear-gradient(135deg, var(--g1), var(--g2));
}

.project-body {
  padding: 24px;
}

.project-body h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.project-body p {
  color: var(--text-dim);
  font-size: 0.92rem;
  margin-bottom: 16px;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.project-tags span {
  font-size: 0.78rem;
  padding: 4px 10px;
  border-radius: 6px;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  color: var(--accent);
}

.project-links a {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
}

.project-links a:hover {
  text-decoration: underline;
}

/* ===== 时间线 ===== */
.timeline {
  position: relative;
  max-width: 680px;
  margin: 0 auto;
  padding-left: 32px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
}

.timeline-item {
  position: relative;
  padding-bottom: 40px;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: -32px;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bg);
  border: 3px solid var(--accent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 20%, transparent);
}

.timeline-content {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px 24px;
  transition: all 0.3s;
}

.timeline-content:hover {
  background: var(--card-hover);
  transform: translateX(4px);
}

.timeline-date {
  font-size: 0.82rem;
  color: var(--accent);
  font-weight: 600;
}

.timeline-content h3 {
  font-size: 1.05rem;
  margin: 6px 0;
}

.timeline-content p {
  color: var(--text-dim);
  font-size: 0.92rem;
}

/* ===== 联系 ===== */
.contact-sub {
  color: var(--text-dim);
  max-width: 520px;
  margin-bottom: 40px;
}

.contact-grid {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 40px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--card);
  text-decoration: none;
  color: var(--text);
  transition: all 0.3s;
}

.contact-item:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.contact-icon {
  font-size: 1.4rem;
  color: var(--accent);
}

.contact-item strong {
  font-size: 0.95rem;
}

.contact-item div {
  color: var(--text-dim);
  font-size: 0.9rem;
  line-height: 1.5;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.contact-form input,
.contact-form textarea {
  padding: 13px 16px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color 0.2s;
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.contact-form textarea {
  resize: vertical;
}

.form-status {
  font-size: 0.9rem;
  color: var(--accent);
  min-height: 1.4em;
}

/* ===== 页脚 ===== */
.footer {
  padding: 36px 24px;
  border-top: 1px solid var(--border);
}

.footer-inner {
  max-width: 1080px;
  margin: 0 auto;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.88rem;
}

/* ===== 滚动动画 ===== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== 响应式 ===== */
@media (max-width: 860px) {
  .about-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .about-stats {
    justify-content: center;
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }

  .nav-links {
    position: fixed;
    top: var(--nav-h);
    right: 0;
    flex-direction: column;
    background: var(--bg-soft);
    border-left: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    padding: 24px;
    gap: 18px;
    width: 220px;
    transform: translateX(100%);
    transition: transform 0.3s ease;
  }

  .nav-links.open {
    transform: translateX(0);
  }

  .menu-toggle {
    display: flex;
  }

  .section {
    padding: 72px 20px;
  }
}