/* ====== 基础变量 ====== */
:root {
  --bg: #ffffff;
  --bg-secondary: #f5f5f5;
  --text: #1a1a1a;
  --text-secondary: #666666;
  --text-tertiary: #999999;
  --border: #e5e5e5;
  --accent: #1a1a1a;
  --tag-bg: #f0f0f0;
  --tag-text: #555555;
  --shadow: 0 2px 16px rgba(0,0,0,0.06);
  --shadow-hover: 0 8px 32px rgba(0,0,0,0.12);
  --radius: 12px;
  --max-width: 1100px;
  --nav-height: 64px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --code-bg: #1e1e2e;
  --code-fg: #f8f8f2;
  --inline-code-bg: var(--tag-bg);
  --callout-term-bg: rgba(240, 192, 0, 0.12);
  --callout-term-border: #f0c000;
  --callout-take-bg: rgba(9, 105, 218, 0.08);
  --callout-take-border: #0969da;
}

[data-theme="dark"] {
  --bg: #0f0f0f;
  --bg-secondary: #1a1a1a;
  --text: #f5f5f5;
  --text-secondary: #aaaaaa;
  --text-tertiary: #777777;
  --border: #2a2a2a;
  --accent: #f5f5f5;
  --tag-bg: #1e1e1e;
  --tag-text: #bbbbbb;
  --shadow: 0 2px 16px rgba(0,0,0,0.3);
  --shadow-hover: 0 8px 32px rgba(0,0,0,0.5);
  --code-bg: #0b0b0f;
  --code-fg: #e4e4e4;
  --inline-code-bg: var(--tag-bg);
  --callout-term-bg: rgba(240, 192, 0, 0.10);
  --callout-term-border: #f0c000;
  --callout-take-bg: rgba(9, 105, 218, 0.18);
  --callout-take-border: #4c9bff;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Manrope', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  transition: background var(--transition), color var(--transition);
}

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

img {
  max-width: 100%;
  display: block;
}

/* ====== 字体层级（全站统一） ====== */
h1, h2, h3,
.nav-logo, .hero-name, .section-title,
.article-h1, .article-kicker, .article-title {
  font-family: 'Space Grotesk', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
}

/* ====== 导航栏 ====== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  transition: background var(--transition), border-color var(--transition);
}

[data-theme="dark"] .navbar {
  background: rgba(15,15,15,0.85);
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color var(--transition);
  position: relative;
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--text);
  transition: width var(--transition);
}

.nav-links a:hover::after {
  width: 100%;
}

/* 主题切换按钮 */
.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
  padding: 4px;
  display: flex;
  align-items: center;
  transition: color var(--transition);
}

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

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

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

/* ====== Hero ====== */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--nav-height) 32px 80px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero-name {
  font-size: clamp(3rem, 10vw, 6rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.05;
}

.hero-title {
  font-size: clamp(1.1rem, 3vw, 1.5rem);
  color: var(--text-secondary);
  margin-top: 12px;
  font-weight: 500;
}

.hero-desc {
  font-size: 1rem;
  color: var(--text-tertiary);
  max-width: 500px;
  margin-top: 24px;
}

.scroll-hint {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-tertiary);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: var(--text-tertiary);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; transform: scaleY(1); }
  50% { opacity: 1; transform: scaleY(1.2); }
}

/* ====== 通用 Section ====== */
.section {
  padding: 100px 32px;
  max-width: var(--max-width);
  margin: 0 auto;
  border-top: 1px solid var(--border);
}

.section-header {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 64px;
}

.section-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
}

.section-subtitle {
  font-size: 0.85rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* ====== Projects ====== */
.project-list {
  display: flex;
  flex-direction: column;
  gap: 80px;
}

.project-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 32px;
  cursor: pointer;
  transition: var(--transition);
}

.project-card:hover {
  transform: translateY(-4px);
}

.project-number {
  font-size: 0.85rem;
  color: var(--text-tertiary);
  font-weight: 500;
  padding-top: 4px;
}

.project-image {
  grid-column: 2;
  width: 100%;
  height: 400px;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: box-shadow var(--transition);
}

.project-card:hover .project-image {
  box-shadow: var(--shadow-hover);
}

.project-info {
  grid-column: 2;
  margin-top: 24px;
}

.project-name {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.project-summary {
  color: var(--text-secondary);
  margin-top: 8px;
  max-width: 600px;
}

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

.tag {
  font-size: 0.75rem;
  padding: 4px 12px;
  background: var(--tag-bg);
  color: var(--tag-text);
  border-radius: 100px;
}

/* ====== 占位图样式 ====== */
.placeholder-img {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  color: var(--text-tertiary);
  font-size: 0.85rem;
}

/* ====== Dev Results ====== */
.result-list {
  display: flex;
  flex-direction: column;
}

.result-item {
  display: grid;
  grid-template-columns: 100px 1fr auto;
  gap: 24px;
  align-items: center;
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.result-item:hover {
  padding-left: 12px;
}

.result-date {
  font-size: 0.8rem;
  color: var(--text-tertiary);
  font-variant-numeric: tabular-nums;
}

.result-name {
  font-size: 1.15rem;
  font-weight: 500;
}

.result-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

.result-arrow {
  color: var(--text-tertiary);
  font-size: 1.2rem;
  transition: var(--transition);
}

.result-item:hover .result-arrow {
  color: var(--text);
  transform: translateX(4px);
}

/* ====== Learning ====== */
.article-list {
  display: flex;
  flex-direction: column;
}

.article-item {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 24px;
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.article-item:hover {
  padding-left: 12px;
}

.article-date {
  font-size: 0.8rem;
  color: var(--text-tertiary);
  font-variant-numeric: tabular-nums;
}

.article-title {
  font-size: 1.1rem;
  font-weight: 500;
}

.article-excerpt {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ====== Life ====== */
.life-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.life-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.life-image {
  width: 100%;
  height: 240px;
  border-radius: var(--radius);
  overflow: hidden;
}

.life-text {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.life-date {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  font-variant-numeric: tabular-nums;
}

.life-text p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* ====== About ====== */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
}

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

.about-contact {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.contact-item:hover {
  padding-left: 8px;
}

.contact-label {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.contact-value {
  font-size: 1rem;
  font-weight: 500;
}

/* ====== Footer ====== */
.footer {
  padding: 48px 32px;
  text-align: center;
  border-top: 1px solid var(--border);
  color: var(--text-tertiary);
  font-size: 0.85rem;
}

/* ====== Modal ====== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 32px;
  opacity: 0;
  transition: opacity var(--transition);
}

.modal-overlay.active {
  display: flex;
  opacity: 1;
}

.modal-content {
  background: var(--bg);
  border-radius: var(--radius);
  max-width: 700px;
  width: 100%;
  max-height: 80vh;
  overflow-y: auto;
  padding: 48px;
  position: relative;
  transform: translateY(20px);
  transition: transform var(--transition);
}

.modal-overlay.active .modal-content {
  transform: translateY(0);
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-tertiary);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: var(--transition);
}

.modal-close:hover {
  background: var(--bg-secondary);
  color: var(--text);
}

.modal-body h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.modal-body .modal-tags {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
}

.modal-body .modal-cover {
  width: 100%;
  height: 300px;
  border-radius: var(--radius);
  margin-bottom: 32px;
}

.modal-body h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-top: 24px;
  margin-bottom: 8px;
}

.modal-body p {
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.modal-body ul {
  padding-left: 20px;
  color: var(--text-secondary);
}

.modal-body li {
  margin-bottom: 6px;
}

.modal-body .modal-link {
  display: inline-block;
  margin-top: 24px;
  padding: 10px 24px;
  background: var(--accent);
  color: var(--bg);
  border-radius: 100px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition);
}

.modal-body .modal-link:hover {
  opacity: 0.85;
}

/* ====== Article Page ====== */
.article-page {
  padding-top: var(--nav-height);
}

/* 阅读进度条（仅文章页） */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--callout-take-border), #7ab8ff);
  z-index: 1100;
  transition: width 0.1s linear;
}

.article-wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 88px 32px 80px;
}

.article-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-tertiary);
  margin-bottom: 40px;
  transition: color var(--transition);
}

.article-back:hover {
  color: var(--text);
}

.article-kicker {
  display: block;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-tertiary);
  margin-bottom: 16px;
}

.article-h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.article-meta {
  margin-top: 16px;
  font-size: 0.9rem;
  color: var(--text-tertiary);
  font-variant-numeric: tabular-nums;
}

.article-content {
  margin-top: 48px;
}

.article-content p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.85;
  margin: 20px 0;
}

.article-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 56px 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.article-content strong {
  color: var(--text);
  font-weight: 600;
}

.article-content ul,
.article-content ol {
  margin: 20px 0;
  padding-left: 22px;
  color: var(--text-secondary);
  font-size: 1.02rem;
  line-height: 1.8;
}

.article-content li {
  margin-bottom: 10px;
}

.article-content code {
  font-family: 'JetBrains Mono', "SFMono-Regular", Consolas, Menlo, monospace;
  font-size: 0.88em;
  background: var(--inline-code-bg);
  padding: 2px 7px;
  border-radius: 6px;
  color: var(--text);
}

.article-content pre {
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 20px 22px;
  border-radius: var(--radius);
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.65;
  margin: 24px 0;
}

.article-content pre code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.95rem;
}

.article-content th,
.article-content td {
  border: 1px solid var(--border);
  padding: 10px 14px;
  text-align: left;
}

.article-content th {
  background: var(--bg-secondary);
  font-weight: 600;
  color: var(--text);
}

.article-content td code {
  font-size: 0.85em;
}

.article-content .lbl {
  display: block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  margin: 24px 0 4px;
}

.article-content .term {
  background: var(--callout-term-bg);
  border-left: 4px solid var(--callout-term-border);
  padding: 16px 20px;
  border-radius: 8px;
  margin: 28px 0;
  color: var(--text);
  font-size: 1.02rem;
  line-height: 1.8;
}

.article-content .take {
  background: var(--callout-take-bg);
  border-left: 4px solid var(--callout-take-border);
  padding: 16px 20px;
  border-radius: 8px;
  margin: 28px 0;
  color: var(--text);
  font-size: 1.02rem;
  line-height: 1.8;
}

.article-content .term ul,
.article-content .take ul {
  margin: 8px 0 0;
}

.article-foot {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  color: var(--text-tertiary);
  font-size: 0.85rem;
}

/* ====== 响应式 ====== */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 24px 32px;
    gap: 20px;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .hero {
    padding: var(--nav-height) 20px 60px;
  }

  .section {
    padding: 60px 20px;
  }

  .project-card {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .project-number {
    grid-column: 1;
  }

  .project-image {
    grid-column: 1;
    height: 240px;
  }

  .project-info {
    grid-column: 1;
  }

  .result-item,
  .article-item {
    grid-template-columns: 80px 1fr;
    gap: 16px;
  }

  .result-arrow {
    display: none;
  }

  .life-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .about-content {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .modal-content {
    padding: 32px 24px;
  }

  .article-wrap {
    padding: 64px 20px 60px;
  }

  .article-content h2 {
    font-size: 1.3rem;
    margin: 40px 0 14px;
  }

  .article-content p {
    font-size: 1rem;
  }

  .article-content pre {
    font-size: 0.8rem;
    padding: 16px;
  }
}