/* ==========================================================================
   李江遥的个人网站 — 样式表
   浅色简洁风 / 蓝色强调 / 大留白 / 跟随系统深色模式
   零外部依赖：不引用任何网络字体、图片或图标库
   ========================================================================== */

/* ---------- 1. 设计变量 ---------- */
:root {
  color-scheme: light dark;

  --bg:            #ffffff;
  --bg-soft:       #f6f8fb;
  --bg-blur:       rgba(255, 255, 255, .84);
  --panel:         #ffffff;
  --text:          #14171d;
  --text-soft:     #58606e;
  --text-faint:    #6b7280;   /* 对比度 4.83:1 on #ffffff，满足 WCAG AA 4.5:1（原 #8b93a1 仅 3.09:1） */
  --accent:        #2563eb;
  --accent-strong: #1d4ed8;
  --accent-soft:   #eef3ff;
  --accent-line:   #cddbfe;
  --on-accent:     #ffffff;
  --border:        #e7eaef;
  --border-strong: #d7dce4;
  --avatar-grad:   linear-gradient(140deg, #2563eb, #4f46e5);
  --shadow-sm:     0 1px 2px rgba(16, 24, 40, .05);
  --shadow-md:     0 1px 2px rgba(16, 24, 40, .04), 0 10px 28px -12px rgba(16, 24, 40, .18);

  --radius-sm: 8px;
  --radius:    14px;
  --radius-lg: 20px;
  --wrap:      760px;
  --gutter:    24px;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC",
               "Noto Sans CJK SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:            #0d1017;
    --bg-soft:       #141922;
    --bg-blur:       rgba(13, 16, 23, .84);
    --panel:         #161b24;
    --text:          #e9edf4;
    --text-soft:     #a7b0be;
    --text-faint:    #7d8797;
    --accent:        #7fa6ff;
    --accent-strong: #9dbcff;
    --accent-soft:   #182338;
    --accent-line:   #2b3c58;
    --on-accent:     #0d1017;
    --border:        #232b37;
    --border-strong: #313b4a;
    --avatar-grad:   linear-gradient(140deg, #3b6fe0, #6d5ce7);
    --shadow-sm:     0 1px 2px rgba(0, 0, 0, .45);
    --shadow-md:     0 1px 2px rgba(0, 0, 0, .45), 0 12px 30px -14px rgba(0, 0, 0, .7);
  }
}

/* ---------- 2. 基础 ---------- */
*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--accent); }

::selection { background: var(--accent-soft); color: var(--accent-strong); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  padding: 10px 16px;
  background: var(--accent);
  color: var(--on-accent);
  border-radius: 0 0 var(--radius-sm) 0;
  z-index: 50;
}
.skip-link:focus { left: 0; }

/* ---------- 3. 页头 / 页脚 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--bg-blur);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 62px;
  padding-top: 8px;
  padding-bottom: 8px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  text-decoration: none;
  color: inherit;
  min-width: 0;
}

.brand-initial {
  flex: none;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  background: var(--avatar-grad);
  color: #fff;
  font-weight: 600;
  font-size: 16px;
}

.brand-text { display: flex; flex-direction: column; line-height: 1.25; min-width: 0; }
.brand-text strong { font-size: .98rem; font-weight: 600; }
.brand-text small { color: var(--text-faint); font-size: .76rem; }

.site-nav { display: flex; gap: 4px; flex: none; }
.site-nav a {
  padding: 7px 13px;
  border-radius: 999px;
  font-size: .93rem;
  color: var(--text-soft);
  text-decoration: none;
  transition: background-color .15s ease, color .15s ease;
}
.site-nav a:hover { background: var(--bg-soft); color: var(--text); }
.site-nav a[aria-current="page"] {
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-weight: 600;
}

.site-footer {
  margin-top: 76px;
  border-top: 1px solid var(--border);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 20px;
  padding-top: 26px;
  padding-bottom: 46px;
  color: var(--text-faint);
  font-size: .84rem;
  line-height: 1.7;
}
.footer-inner p { margin: 0; }

/* ---------- 4. 首页 ---------- */
.hero { padding: 56px 0 44px; }

.avatar {
  width: 68px;
  height: 68px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 30px;
  font-weight: 600;
  color: #fff;
  background: var(--avatar-grad);
  box-shadow: var(--shadow-md);
}

.hero h1 {
  font-size: clamp(1.7rem, 4.2vw, 2.15rem);
  line-height: 1.3;
  letter-spacing: -.01em;
  margin: 24px 0 12px;
}

.hero-tagline {
  font-size: 1.06rem;
  color: var(--text-soft);
  margin: 0 0 14px;
  max-width: 34em;
}

.hero-meta { font-size: .86rem; color: var(--text-faint); margin: 0; }

.panel { margin-bottom: 52px; }

.section-label {
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .09em;
  color: var(--text-faint);
  margin: 0 0 16px;
}

.panel-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}
.panel-head .section-label { margin: 0; }
.more {
  font-size: .88rem;
  text-decoration: none;
  color: var(--text-soft);
  white-space: nowrap;
}
.more:hover { color: var(--accent); }

.prose { font-size: 1.02rem; color: var(--text-soft); }
.prose p { margin: 0 0 1.1em; }
.prose p:last-child { margin-bottom: 0; }

.interest-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.interest {
  display: flex;
  gap: 14px;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-soft);
}
.interest-icon {
  flex: none;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  font-size: 20px;
  background: var(--accent-soft);
  border: 1px solid var(--accent-line);
}
.interest h3 { margin: 2px 0 6px; font-size: 1rem; }
.interest p { margin: 0; font-size: .9rem; line-height: 1.68; color: var(--text-soft); }

/* ---------- 5. 日记列表 ---------- */
.post-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.post-link {
  display: block;
  padding: 18px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  color: inherit;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.post-link:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent-line);
}

.post-top {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: .8rem;
  color: var(--text-faint);
}

.post-link h3 {
  font-size: 1.12rem;
  line-height: 1.45;
  margin: 7px 0 8px;
  color: var(--text);
  transition: color .15s ease;
}
.post-link:hover h3 { color: var(--accent); }

.post-summary {
  display: block;
  margin: 0 0 13px;
  font-size: .95rem;
  line-height: 1.68;
  color: var(--text-soft);
}

.tag-row { display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
  font-size: .74rem;
  line-height: 1.6;
  padding: 2px 9px;
  border-radius: 999px;
  background: var(--accent-soft);
  border: 1px solid var(--accent-line);
  color: var(--accent-strong);
}

.page-head { padding: 52px 0 24px; }
.page-head h1 {
  font-size: clamp(1.6rem, 4vw, 2rem);
  line-height: 1.3;
  letter-spacing: -.01em;
  margin: 0 0 10px;
}
.page-head p { margin: 0; color: var(--text-soft); font-size: .96rem; }

.chip-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 30px; }
.chip {
  font: inherit;
  font-size: .86rem;
  line-height: 1.5;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: var(--panel);
  color: var(--text-soft);
  cursor: pointer;
  transition: background-color .15s ease, border-color .15s ease, color .15s ease;
}
.chip:hover { border-color: var(--accent-line); color: var(--accent-strong); }
.chip[aria-pressed="true"] {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-accent);
  font-weight: 600;
}

.year-group { margin-bottom: 42px; }
.year-group:last-child { margin-bottom: 0; }
.year {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 15px;
  font-size: .82rem;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--text-faint);
}
.year::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}

.empty {
  padding: 40px 0;
  text-align: center;
  color: var(--text-faint);
  font-size: .94rem;
}

/* ---------- 6. 文章详情 ---------- */
.article { padding-top: 44px; }

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: .88rem;
  color: var(--text-soft);
  text-decoration: none;
}
.back-link:hover { color: var(--accent); }

.article-head { margin: 22px 0 34px; }
.article-head h1 {
  font-size: clamp(1.5rem, 4vw, 1.95rem);
  line-height: 1.4;
  letter-spacing: -.01em;
  margin: 0 0 16px;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  font-size: .84rem;
  color: var(--text-faint);
}
.article-meta .tag-row { margin-left: auto; }

.article-body { font-size: 1.06rem; line-height: 1.95; }
.article-body p { margin: 0 0 1.25em; }
.article-body h2 {
  font-size: 1.2rem;
  line-height: 1.5;
  margin: 2.1em 0 .8em;
  padding-left: 13px;
  border-left: 3px solid var(--accent);
}
.article-body ul { margin: 0 0 1.35em; padding-left: 1.3em; }
.article-body li { margin-bottom: .5em; }
.article-body li::marker { color: var(--accent); }
.article-body blockquote {
  margin: 1.7em 0;
  padding: 15px 19px;
  background: var(--accent-soft);
  border-left: 3px solid var(--accent-line);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-soft);
}
.article-body code {
  font-family: var(--font-mono);
  font-size: .88em;
  padding: 1px 6px;
  border-radius: 5px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
}
.article-body strong { font-weight: 650; color: var(--text); }

.article-rule {
  margin-top: 44px;
  border-top: 1px solid var(--border);
}

.pager {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 40px;
}
.pager a {
  display: block;
  padding: 16px 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  text-decoration: none;
  color: inherit;
  transition: border-color .15s ease, transform .18s ease;
}
.pager a:hover { border-color: var(--accent-line); transform: translateY(-2px); }
.pager .label { font-size: .78rem; color: var(--text-faint); }
.pager .title { display: block; margin-top: 5px; font-size: .98rem; line-height: 1.5; }
.pager .next { text-align: right; }

.related { margin-top: 46px; }

/* ---------- 7. 提示 / 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 999px;
  background: var(--accent);
  color: var(--on-accent);
  font-size: .92rem;
  font-weight: 600;
  text-decoration: none;
  transition: background-color .15s ease;
}
.btn:hover { background: var(--accent-strong); }

.notice { padding: 64px 0; }
.notice h1 { font-size: 1.5rem; margin: 0 0 12px; }
.notice p { margin: 0 0 24px; color: var(--text-soft); }

.noscript {
  margin: 22px 0;
  padding: 16px 18px;
  border: 1px solid var(--accent-line);
  border-radius: var(--radius);
  background: var(--accent-soft);
  color: var(--text);
  font-size: .92rem;
}

/* ---------- 8. 响应式 ---------- */
@media (max-width: 640px) {
  body { font-size: 16.5px; }
  :root { --gutter: 18px; }

  .hero { padding: 40px 0 34px; }
  .avatar { width: 58px; height: 58px; font-size: 26px; border-radius: 50%; }
  .hero h1 { margin-top: 18px; }
  .panel { margin-bottom: 42px; }
  .page-head { padding: 38px 0 20px; }
  .article { padding-top: 30px; }
  .interest-grid { grid-template-columns: 1fr; }
  .post-link { padding: 16px 17px; }
  .article-meta .tag-row { margin-left: 0; }
  .pager { grid-template-columns: 1fr; }
  .pager .next { text-align: left; }
  .site-footer { margin-top: 56px; }
}

@media (max-width: 560px) {
  .brand-text small { display: none; }
}

/* ---------- 9. 无障碍 / 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}