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

:root {
  --bg: #fbfbfd;
  --bg-soft: #ffffff;
  --header-bg: rgba(251, 251, 253, 0.82);
  --text: #1c1e26;
  --text-soft: #5b6270;
  --border: #e6e8ee;
  --accent: #4f46e5;
  --accent-2: #9333ea;
  --accent-soft: rgba(79, 70, 229, 0.08);
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.04), 0 8px 24px rgba(16, 24, 40, 0.06);
}

[data-theme="dark"] {
  --bg: #0b0f16;
  --bg-soft: #111722;
  --header-bg: rgba(11, 15, 22, 0.82);
  --text: #e8ecf3;
  --text-soft: #9aa4b5;
  --border: #232b3a;
  --accent: #8b93ff;
  --accent-2: #c084fc;
  --accent-soft: rgba(139, 147, 255, 0.12);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.3);
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 76px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  transition: background 0.25s ease, color 0.25s ease;
}

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

img {
  max-width: 100%;
}

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

.container {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 20px;
}

section[id] {
  scroll-margin-top: 76px;
}

/* ============ 顶部导航 ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--header-bg);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  gap: 16px;
}

.logo {
  font-weight: 700;
  font-size: 1.05rem;
}

.nav-links {
  display: flex;
  gap: 20px;
}

.nav-links a {
  color: var(--text-soft);
  font-size: 0.95rem;
  transition: color 0.15s ease;
}

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

.theme-toggle {
  background: var(--accent-soft);
  border: 1px solid var(--border);
  border-radius: 10px;
  width: 36px;
  height: 36px;
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  display: grid;
  place-items: center;
  transition: transform 0.15s ease;
}

.theme-toggle:hover {
  transform: scale(1.08);
}

/* ============ 首页 Hero ============ */
.hero {
  text-align: center;
  padding: 88px 20px 72px;
}

.hero-hi {
  color: var(--text-soft);
  font-size: 1.05rem;
}

.hero-name {
  font-size: clamp(2.6rem, 7vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 8px 0 12px;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.tagline {
  color: var(--text-soft);
  font-size: 1.1rem;
  margin-bottom: 28px;
}

.hero-links {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 9px 20px;
  border-radius: 999px;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  color: #fff;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(79, 70, 229, 0.3);
}

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

.btn-ghost:hover {
  box-shadow: none;
  border-color: var(--accent);
  color: var(--accent);
}

/* ============ 区块 ============ */
.section {
  padding: 48px 20px 8px;
}

.section-title {
  font-size: 1.5rem;
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-title::before {
  content: "";
  width: 4px;
  height: 22px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
}

.section > p {
  color: var(--text-soft);
  max-width: 660px;
}

.section > p + p {
  margin-top: 12px;
}

/* ============ 卡片网格 ============ */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  margin-top: 20px;
}

.card {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  box-shadow: var(--shadow);
  transition: transform 0.18s ease, border-color 0.18s ease;
}

.card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
}

.card time {
  color: var(--text-soft);
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
}

.card h3 {
  margin: 8px 0 6px;
  font-size: 1.1rem;
  line-height: 1.4;
}

.card h3 a:hover {
  color: var(--accent);
}

.card p {
  color: var(--text-soft);
  font-size: 0.93rem;
}

.more {
  display: inline-block;
  margin-top: 10px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
}

.more:hover {
  text-decoration: underline;
}

.card-emoji {
  font-size: 1.6rem;
  margin-bottom: 8px;
}

.tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.tags span {
  font-size: 0.78rem;
  padding: 2px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid var(--border);
}

/* ============ 联系 ============ */
.email-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 16px 0 12px;
}

.email-btn {
  display: inline-flex;
  align-items: center;
  padding: 12px 20px;
  border-radius: 14px;
  font-size: 1rem;
  font-weight: 600;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  transition: transform 0.15s ease, border-color 0.15s ease;
  word-break: break-all;
}

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

.email-tag {
  margin-right: 8px;
  font-size: 0.78rem;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700;
}

.hint {
  font-size: 0.85rem;
}

/* ============ 页脚 ============ */
.site-footer {
  margin-top: 64px;
  border-top: 1px solid var(--border);
  padding: 24px 0;
  text-align: center;
  color: var(--text-soft);
  font-size: 0.88rem;
}

.site-footer a {
  color: var(--accent);
}

/* ============ 文章页 ============ */
.article {
  max-width: 720px;
  margin: 48px auto 0;
  padding: 0 20px 64px;
}

.article-header time {
  color: var(--text-soft);
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
}

.article h1 {
  font-size: clamp(1.8rem, 5vw, 2.4rem);
  line-height: 1.3;
  margin: 8px 0 16px;
}

.article .meta {
  color: var(--text-soft);
  font-size: 0.9rem;
  margin-bottom: 28px;
}

.article-body h2 {
  margin: 36px 0 12px;
  font-size: 1.35rem;
}

.article-body p {
  margin-bottom: 16px;
}

.article-body ul,
.article-body ol {
  margin: 0 0 16px 24px;
}

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

.article-body code {
  background: var(--accent-soft);
  padding: 2px 6px;
  border-radius: 6px;
  font-size: 0.88em;
}

.article-body pre {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  overflow-x: auto;
  margin-bottom: 16px;
}

.article-body pre code {
  background: none;
  padding: 0;
}

.article-body blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 14px;
  color: var(--text-soft);
  margin-bottom: 16px;
}

.article-footer {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

.article-footer a {
  color: var(--accent);
  font-weight: 600;
}

/* ============ 404 页 ============ */
.error-page {
  min-height: 70vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 12px;
  padding: 0 20px;
}

.error-code {
  font-size: clamp(4rem, 16vw, 8rem);
  font-weight: 800;
  line-height: 1;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.error-page p {
  color: var(--text-soft);
}

.error-page .btn {
  margin-top: 12px;
}

/* ============ 移动端 ============ */
@media (max-width: 600px) {
  .nav-links {
    gap: 12px;
  }

  .nav-links a {
    font-size: 0.88rem;
  }

  .hero {
    padding: 64px 20px 56px;
  }
}