/* ========================================
   Design Tokens
   4 主题：日间墨竹 / 夜间墨竹 / 日间普通 / 夜间普通
======================================== */

:root {
  /* Day 日间色调（默认） */
  --bg: #f5f0eb;
  --text: #292524;
  --mid: #6f6863;
  --line: #d6d3d1;
  --accent: #c2410c;
  --surface: #ede9e3;
  --surface-strong: rgba(245, 240, 235, 0.92);
  --danger: #dc2626;
  --ok: #16a34a;
  --syntax-comment: #6f6863;
  --syntax-keyword: #a626a4;
  --syntax-string: #4078f2;
  --syntax-number: #986801;
  --syntax-title: #c18401;
  --ease: cubic-bezier(0.23, 1, 0.32, 1);
  --ease-slow: cubic-bezier(0.16, 1, 0.3, 1);
}

/* body.day: 日间墨竹 — 与 :root 同色，仅作 CSS 选择器钩子 */

/* 夜间：墨竹 + 普通共用同一套暗色令牌 */
body.night,
body.night-pure {
  --bg: #0a0a0a;
  --text: #d0cac4;
  --mid: #a39b93;
  --line: #2a2623;
  --accent: #ea580c;
  --surface: #141210;
  --surface-strong: rgba(20, 18, 16, 0.9);
  --syntax-comment: #8b949e;
  --syntax-keyword: #ff7b72;
  --syntax-string: #a5d6ff;
  --syntax-number: #79c0ff;
  --syntax-title: #d2a8ff;
}

/* body.day-pure: 日间普通 — 与 :root 同色，无覆盖层 */

/* ========================================
   Reset & Base
======================================== */

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Noto Serif SC", "Noto Sans SC", Georgia, serif;
  font-size: 15px;
  font-weight: 300;
  line-height: 1.8;
  transition: background 600ms var(--ease), color 600ms var(--ease);
  min-height: 100vh;
  position: relative;
}

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

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 10000;
  padding: 8px 12px;
  color: var(--text);
  background: var(--surface-strong);
  border: 1px solid var(--line);
  transform: translateY(-160%);
  transition: transform 160ms var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
}

/* ========================================
   Noise Texture Overlay (SVG fractalNoise)
======================================== */

body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='256' height='256'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='256' height='256' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 256px 256px;
  background-repeat: repeat;
}

body.night::after,
body.night-pure::after {
  opacity: 0.025;
}

/* ========================================
   Ink Bamboo Overlay
   日间墨竹 / 夜间墨竹共用一份 SVG
======================================== */

#leaves-overlay {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 3;
  opacity: 0;
  overflow: visible;
  mix-blend-mode: multiply;
  transform: translate3d(0, 0, 0) scale(var(--overlay-scale, 1.05));
  transform-origin: 100% 0%;
  will-change: opacity, filter;
  backface-visibility: hidden;
  contain: paint;
  transition: opacity 1200ms var(--ease), filter 600ms var(--ease);
}

/* 日间墨竹：multiply — 深墨叠于淡纸 */
body.day #leaves-overlay {
  opacity: 0.82;
  mix-blend-mode: multiply;
  filter: none;
}

/* 夜间墨竹：screen + invert — 浅墨浮于暗底；hue-rotate 保留暖调 */
body.night #leaves-overlay {
  opacity: 0.58;
  mix-blend-mode: screen;
  filter: invert(1) hue-rotate(180deg) sepia(0.12) saturate(0.72) brightness(0.82);
}

/* 夜间各枝透明度调高（screen 模式比 multiply 显色弱） */
body.night .bamboo-far      { opacity: 0.32; }
body.night .bamboo-branch-a { opacity: 0.52; }
body.night .bamboo-branch-b { opacity: 0.46; }
body.night .bamboo-branch-c { opacity: 0.42; }
body.night .bamboo-branch-d { opacity: 0.65; }
body.night .bamboo-branch-e { opacity: 0.58; }

/* 竹枝分组基础透明度 & 动画 */
.bamboo-far {
  opacity: 0.22;
  animation: bambooFar 34s ease-in-out infinite;
  will-change: transform;
  transform-box: fill-box;
  transform-origin: center;
}

.bamboo-mid,
.bamboo-near {
  opacity: 1;
  transform-box: fill-box;
  transform-origin: center;
}

.bamboo-branch-a {
  opacity: 0.34;
  animation: bambooMid 22s ease-in-out infinite;
  animation-delay: -4s;
  will-change: transform;
  transform-box: fill-box;
  transform-origin: center;
}
.bamboo-branch-b {
  opacity: 0.30;
  animation: bambooMid 27s ease-in-out infinite;
  animation-delay: -14s;
  will-change: transform;
  transform-box: fill-box;
  transform-origin: center;
}
.bamboo-branch-c {
  opacity: 0.28;
  animation: bambooMid 19s ease-in-out infinite;
  animation-delay: -8s;
  will-change: transform;
  transform-box: fill-box;
  transform-origin: center;
}
.bamboo-branch-d {
  opacity: 0.46;
  animation: bambooNear 15s ease-in-out infinite;
  animation-delay: -5s;
  will-change: transform;
  transform-box: fill-box;
  transform-origin: center;
}
.bamboo-branch-e {
  opacity: 0.40;
  animation: bambooNear 18s ease-in-out infinite;
  animation-delay: -11s;
  will-change: transform;
  transform-box: fill-box;
  transform-origin: center;
}

@keyframes bambooFar {
  0%, 100% { transform: translate(0, 0); }
  35%      { transform: translate(8px, 6px); }
  70%      { transform: translate(-5px, 12px); }
}
@keyframes bambooMid {
  0%, 100% { transform: translate(0, 0); }
  38%      { transform: translate(9px, 5px); }
  68%      { transform: translate(-4px, 10px); }
}
@keyframes bambooNear {
  0%, 100% { transform: translate(0, 0); }
  42%      { transform: translate(7px, -3px); }
  76%      { transform: translate(-4px, 7px); }
}

/* =============================================
   竹叶覆盖层自适应 — 5 断点完整策略

   原则：屏幕越小 → 越淡、越少；SVG 缩放收缩使竹子
         自然退向右上角，不再往内容区域平移。
   ============================================= */

/* ── 宽屏（≥1440px）：稍微加强，有充足留白 ── */
@media (min-width: 1440px) {
  #leaves-overlay { --overlay-scale: 1.06; }
  body.day #leaves-overlay   { opacity: 0.88; }
  body.night #leaves-overlay { opacity: 0.62; }
}

/* ── 普通桌面（1024~1279px）：轻微缩放 ── */
@media (max-width: 1279px) {
  body.day #leaves-overlay,
  body.night #leaves-overlay {
    --overlay-scale: 1.01;
  }
}

/* ── 平板（768~1023px）：减淡、缩小，远景淡出 ── */
@media (max-width: 1023px) {
  body.day #leaves-overlay   { opacity: 0.46; }
  body.night #leaves-overlay { opacity: 0.34; }
  body.day #leaves-overlay,
  body.night #leaves-overlay {
    --overlay-scale: 0.96;
  }
  .bamboo-far { opacity: 0.10; }
}

/* ── 手机（<768px）：大幅弱化，远景隐藏 ── */
@media (max-width: 767px) {
  body.day #leaves-overlay   { opacity: 0.20; }
  body.night #leaves-overlay { opacity: 0.15; }
  body.day #leaves-overlay,
  body.night #leaves-overlay {
    --overlay-scale: 0.90;
  }
  .bamboo-far      { display: none; }
  .bamboo-branch-c { opacity: 0.10 !important; }
}

/* ── 小屏手机（<480px）：极淡，仅右上角残影 ── */
@media (max-width: 479px) {
  body.day #leaves-overlay   { opacity: 0.11; }
  body.night #leaves-overlay { opacity: 0.08; }
  body.day #leaves-overlay,
  body.night #leaves-overlay {
    --overlay-scale: 0.84;
  }
  .bamboo-branch-b,
  .bamboo-branch-c { display: none; }
}

/* 降级：偏好减少动画 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  #leaves-overlay,
  .bamboo-far, .bamboo-branch-a, .bamboo-branch-b,
  .bamboo-branch-c, .bamboo-branch-d, .bamboo-branch-e {
    animation: none !important;
  }
  body.day #leaves-overlay,
  body.night #leaves-overlay {
    --overlay-scale: 1.02;
  }
}

/* 高 DPI：SVG 矢量自然锐利 */
@media (min-resolution: 2dppx) {
  #leaves-overlay { shape-rendering: geometricPrecision; }
}

/* ========================================
   Layout — 版心 760px
======================================== */

.page {
  max-width: 760px;
  margin: 0 auto;
  padding: 40px 40px 80px;
  position: relative;
  z-index: 2;
}

/* ========================================
   Logo / 站点标题
======================================== */

.logo {
  display: inline-block;
  margin: 8px 0 16px;
  text-decoration: none;
}

.logo-letter {
  font-size: 80px;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--text);
  display: block;
  line-height: 1;
  transition: color 200ms var(--ease), transform 200ms var(--ease);
}

.logo:hover .logo-letter {
  color: var(--accent);
  transform: translateY(-4px);
}

.logo-hint {
  font-family: "Fragment Mono", "Courier New", monospace;
  font-size: 9px;
  letter-spacing: 0.12em;
  color: var(--mid);
  text-transform: uppercase;
  margin-top: 6px;
  opacity: 0;
  transition: opacity 200ms var(--ease);
}

.logo:hover .logo-hint {
  opacity: 1;
}

/* ========================================
   Bio / Tagline
======================================== */

.bio {
  font-size: 18px;
  line-height: 2;
  color: var(--mid);
  margin-bottom: 32px;
}

/* ========================================
   Divider
======================================== */

.divider {
  border: none;
  border-top: 1px solid var(--line);
  margin: 30px 0 34px;
  transition: border-color 600ms var(--ease);
}

/* ========================================
   Entry Cards — 文章列表
======================================== */

.entries {
  list-style: none;
}

.grouped-entries {
  display: grid;
  gap: 34px;
}

.post-group {
  display: block;
}

.group-title {
  font-family: "Fragment Mono", "Courier New", monospace;
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mid);
  margin-bottom: 12px;
}

.group-list {
  list-style: none;
}

.entry {
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
  opacity: 0;
  transform: translateY(10px);
  animation: entryFadeIn 800ms var(--ease-slow) forwards;
  transition: border-color 600ms var(--ease);
}

@keyframes entryFadeIn {
  to { opacity: 1; transform: translateY(0); }
}

.entry:nth-child(1) { animation-delay: 0ms; }
.entry:nth-child(2) { animation-delay: 80ms; }
.entry:nth-child(3) { animation-delay: 160ms; }
.entry:nth-child(4) { animation-delay: 240ms; }
.entry:nth-child(5) { animation-delay: 320ms; }
.entry:nth-child(6) { animation-delay: 400ms; }
.entry:nth-child(7) { animation-delay: 480ms; }
.entry:nth-child(8) { animation-delay: 560ms; }

.entry-title {
  font-size: 31px;
  font-weight: 600;
  line-height: 1.42;
  margin-bottom: 8px;
}

.entry-title a {
  color: var(--text);
  text-decoration: none;
  transition: color 200ms var(--ease);
}

.entry-title a:hover {
  color: var(--accent);
}

.entry-meta {
  font-family: "Fragment Mono", "Courier New", monospace;
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--mid);
  margin-bottom: 10px;
}

.entry-excerpt {
  font-size: 14px;
  line-height: 1.75;
  color: var(--mid);
}

/* ========================================
   Empty State
======================================== */

.empty-state {
  padding: 48px 0 24px;
  color: var(--mid);
  font-size: 14px;
}

/* ========================================
   Post Shell — 文章详情容器
======================================== */

.post-shell {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 2px;
  padding: 28px 30px 40px;
  margin-bottom: 48px;
  transition: background 600ms var(--ease), border-color 600ms var(--ease);
}

/* ========================================
   Post Navigation
======================================== */

.post-back {
  font-family: "Fragment Mono", "Courier New", monospace;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--mid);
  text-decoration: none;
  display: inline-block;
  margin-bottom: 28px;
  transition: color 200ms var(--ease);
}

.post-back:hover {
  color: var(--accent);
}

/* ========================================
   Post Typography — 文章标题与元信息
======================================== */

.post-title {
  font-size: 42px;
  font-weight: 600;
  line-height: 1.35;
  color: var(--text);
  margin-bottom: 14px;
}

.post-meta {
  font-family: "Fragment Mono", "Courier New", monospace;
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--mid);
  margin-bottom: 36px;
}

/* ========================================
   Markdown Content Styles
======================================== */

.post-content {
  color: var(--text);
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4,
.post-content h5,
.post-content h6 {
  font-weight: 600;
  line-height: 1.4;
  color: var(--text);
  margin: 2.2em 0 0.8em;
}

.post-content h1 { font-size: 28px; }
.post-content h2 { font-size: 22px; }
.post-content h3 { font-size: 18px; }
.post-content h4 { font-size: 16px; }

.post-content p {
  margin-bottom: 1.4em;
  line-height: 1.85;
}

.post-content a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(234, 88, 12, 0.4);
  transition: text-decoration-color 200ms var(--ease), opacity 200ms var(--ease);
}

.post-content a:hover {
  text-decoration-color: var(--accent);
  opacity: 0.85;
}

.post-content ul,
.post-content ol {
  padding-left: 1.6em;
  margin-bottom: 1.4em;
}

.post-content li {
  margin-bottom: 0.4em;
  line-height: 1.8;
}

.post-content blockquote {
  border-left: 2px solid var(--accent);
  padding: 4px 0 4px 18px;
  color: var(--mid);
  font-size: 15px;
  margin: 1.8em 0;
}

.post-content blockquote p {
  margin-bottom: 0;
}

.post-content code {
  font-family: "Fragment Mono", "Courier New", monospace;
  font-size: 12px;
  background: var(--surface);
  color: var(--accent);
  padding: 2px 7px;
  border-radius: 2px;
  border: 1px solid var(--line);
}

.post-content pre {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 2px;
  padding: 20px 24px;
  overflow-x: auto;
  margin: 1.8em 0;
  transition: background 600ms var(--ease), border-color 600ms var(--ease);
}

.code-block {
  position: relative;
  margin: 1.8em 0;
}

.code-block pre {
  margin: 0;
}

.copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface-strong) 92%, transparent);
  color: var(--mid);
  font-family: "Fragment Mono", "Courier New", monospace;
  font-size: 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 5px 8px;
  border-radius: 999px;
  opacity: 0;
  cursor: pointer;
  transition: opacity 180ms var(--ease), color 180ms var(--ease), border-color 180ms var(--ease), transform 180ms var(--ease);
}

.code-block:hover .copy-btn,
.copy-btn:focus-visible {
  opacity: 1;
}

.copy-btn:hover {
  color: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 35%, var(--line));
  transform: translateY(-1px);
}

.copy-btn.is-copied {
  opacity: 1;
  color: var(--ok);
  border-color: color-mix(in srgb, var(--ok) 40%, var(--line));
}

.copy-btn.is-failed {
  opacity: 1;
  color: var(--danger);
  border-color: color-mix(in srgb, var(--danger) 40%, var(--line));
}

.post-content pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--text);
  font-size: 13px;
  line-height: 1.7;
}

.post-content hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 2.4em 0;
}

.post-content img {
  max-width: 100%;
  border-radius: 2px;
  display: block;
  margin: 1.8em 0;
}

.post-cover {
  display: block;
  width: 100%;
  max-height: 440px;
  object-fit: cover;
  margin: 8px 0 32px;
  border-radius: 2px;
}

.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.8em 0;
  font-size: 14px;
}

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

.post-content th {
  color: var(--mid);
  font-weight: 600;
  background: var(--surface);
}

/* ========================================
   Footer — Connect Links
======================================== */

.footer {
  margin-top: 64px;
  padding-top: 20px;
}

.footer-label {
  font-family: "Fragment Mono", "Courier New", monospace;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--mid);
  opacity: 0.7;
  margin-bottom: 12px;
}

.links-connect {
  display: flex;
  gap: 6px 16px;
  flex-wrap: wrap;
}

.links-connect a {
  font-size: 13px;
  line-height: 1.7;
  color: var(--mid);
  text-decoration: none;
  transition: color 200ms var(--ease);
}

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

/* ========================================
   Mode Switcher — 竹叶图标主题切换
   ・日/D：实心竹叶（filled）
   ・夜/N：镂空竹叶（outlined）
   ・日/夜：大叶含叶脉  D/N：小叶无脉
======================================== */

.mode-indicator {
  position: fixed;
  top: 18px;
  right: 22px;
  display: flex;
  gap: 3px;
  align-items: center;
  z-index: 1000;
  opacity: 0.78;
  transition: opacity 220ms var(--ease);
}

.mode-indicator:hover {
  opacity: 1;
}

/* "MODE" 小标签 */
.subtle-link.mode-label {
  font-family: "Fragment Mono", "Courier New", monospace;
  font-size: 8px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mid);
  opacity: 0.6;
  margin-right: 5px;
  user-select: none;
}

/* ── 按钮基础 ── */
.mode-btn {
  background: none;
  border: none;
  cursor: pointer;
  min-width: 36px;
  min-height: 36px;
  padding: 7px 8px;
  border-radius: 3px;
  position: relative;
  line-height: 0;
  color: var(--mid);
  transition: color 200ms var(--ease);
  -webkit-tap-highlight-color: transparent;
}

.mode-btn:hover       { color: var(--text); }
.mode-btn.is-active   { color: var(--accent); }
.mode-btn:focus-visible {
  outline: 1px solid var(--accent);
  outline-offset: 2px;
}

/* ── 墨竹图标（day / night）──
   viewBox: 0 0 20 28，竹竿垂直居中，叶簇左右交替。
   transform-origin 贴底（竹根位置），hover/spring 动效以根为轴摆动。
── */
.bamboo-icon {
  display: block;
  overflow: visible;
  transform-origin: 50% 95%;
  transition: transform 320ms var(--ease);
  will-change: transform;
}

/* ── 日间墨竹：实心粗竿 + 背景色节环（切割出竹节）+ 实心叶 ── */
.mode-btn[data-mode="day"] .bamboo-culm {
  fill: none;
  stroke: currentColor;
  stroke-width: 3.0;
  stroke-linecap: round;
}

/* 日间节环：用背景色横线切割粗竿，形成竹节分隔 */
.mode-btn[data-mode="day"] .bamboo-ring {
  stroke: var(--bg);
  stroke-width: 1.3;
  stroke-linecap: butt;
}

/* 日间侧枝（连接竹节与叶簇）*/
.mode-btn[data-mode="day"] .bamboo-branch {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
}

/* 日间叶片：实心填充，窄叶 */
.mode-btn[data-mode="day"] .bamboo-leaf {
  fill: currentColor;
  stroke: none;
}

/* ── 夜间墨竹：细轮廓竿 + 同色节环 + 宽叶镂空 ── */
.mode-btn[data-mode="night"] .bamboo-culm {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-linecap: round;
}

/* 夜间节环：背景色切割细竿，形成节痕（与日间技术对称） */
.mode-btn[data-mode="night"] .bamboo-ring {
  stroke: var(--bg);
  stroke-width: 1.8;
  stroke-linecap: butt;
}

/* 夜间侧枝 */
.mode-btn[data-mode="night"] .bamboo-branch {
  fill: none;
  stroke: currentColor;
  stroke-width: 0.9;
  stroke-linecap: round;
}

/* 夜间叶片：宽叶镂空，描边 1.0 确保小尺寸可见空腔 */
.mode-btn[data-mode="night"] .bamboo-leaf {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.0;
  stroke-linejoin: round;
  stroke-linecap: round;
}

/* ── 太阳 / 月亮图标（day-pure / night-pure）──
   viewBox: 0 0 24 24 — 以图标中心旋转。
── */
.theme-icon {
  display: block;
  overflow: visible;
  transform-origin: 50% 50%;
  transition: transform 320ms var(--ease);
  will-change: transform;
}

.theme-icon-stroke {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* 太阳：暖金色，不随按钮状态变色（语义固定）*/
.mode-btn[data-mode="day-pure"]            .theme-icon { color: #b08040; }
.mode-btn[data-mode="day-pure"]:hover      .theme-icon { color: #c4920e; }
.mode-btn[data-mode="day-pure"].is-active  .theme-icon { color: #c4920e; }

/* 月亮：冷青灰，不随按钮状态变色（语义固定）*/
.mode-btn[data-mode="night-pure"]            .theme-icon { color: #7a9ab2; }
.mode-btn[data-mode="night-pure"]:hover      .theme-icon { color: #9ab8cc; }
.mode-btn[data-mode="night-pure"].is-active  .theme-icon { color: #9ab8cc; }

/* ══ 统一悬停动效 ══
   竹枝：以根部为轴向左轻摆（风吹感）
   太阳：顺时针微转（日出感）
   月亮：向左微倾（月弦感，与竹枝一致）
*/
.mode-btn:hover .bamboo-icon                     { transform: rotate(-10deg); }
.mode-btn[data-mode="day-pure"]:hover .theme-icon  { transform: rotate(20deg);  }
/* 月亮：大角度倾斜 + 轻放大，幅度与竹枝/太阳一致 */
.mode-btn[data-mode="night-pure"]:hover .theme-icon { transform: rotate(-22deg) scale(1.12); }

/* ══ 统一激活态：全部放大 1.22×，颜色已各自处理 ══ */
.mode-btn.is-active .bamboo-icon { transform: scale(1.22); }
.mode-btn.is-active .theme-icon  { transform: scale(1.22); }

.mode-btn.is-active:hover .bamboo-icon                       { transform: scale(1.22) rotate(-10deg); }
.mode-btn[data-mode="day-pure"].is-active:hover  .theme-icon  { transform: scale(1.22) rotate(20deg);  }
.mode-btn[data-mode="night-pure"].is-active:hover .theme-icon { transform: scale(1.22) rotate(-22deg); }

/* ══ 统一点击弹跳（JS 添加 .leaf-spring 触发，animationend 移除）══ */
@keyframes leafSpring {
  0%   { transform: scale(1)    rotate(0deg);  }
  20%  { transform: scale(0.76) rotate(14deg); }
  52%  { transform: scale(1.18) rotate(-6deg); }
  76%  { transform: scale(0.97) rotate(2deg);  }
  100% { transform: scale(1)    rotate(0deg);  }
}

.mode-btn.leaf-spring .bamboo-icon,
.mode-btn.leaf-spring .theme-icon {
  animation: leafSpring 500ms var(--ease-slow) both;
}

/* ── Tooltip ── */
.mode-btn::after {
  content: attr(data-label);
  position: absolute;
  top: calc(100% + 9px);
  right: 0;
  background: var(--surface-strong);
  color: var(--text);
  border: 1px solid var(--line);
  padding: 5px 8px;
  border-radius: 2px;
  white-space: nowrap;
  font-family: "Fragment Mono", "Courier New", monospace;
  font-size: 10px;
  letter-spacing: 0.04em;
  opacity: 0;
  transform: translateY(-4px);
  pointer-events: none;
  transition: opacity 150ms var(--ease), transform 150ms var(--ease);
}

.mode-btn:hover::after,
.mode-btn:focus-visible::after {
  opacity: 1;
  transform: translateY(0);
}

/* ========================================
   Highlight.js — 与主题协调
======================================== */

.post-content .hljs {
  background: transparent;
  padding: 0;
}

.hljs-comment,
.hljs-quote { color: var(--syntax-comment); }
.hljs-keyword,
.hljs-selector-tag,
.hljs-literal,
.hljs-section,
.hljs-link { color: var(--syntax-keyword); }
.hljs-string,
.hljs-attr,
.hljs-symbol,
.hljs-bullet,
.hljs-addition { color: var(--syntax-string); }
.hljs-number,
.hljs-meta,
.hljs-built_in,
.hljs-builtin-name { color: var(--syntax-number); }
.hljs-title,
.hljs-name,
.hljs-selector-id,
.hljs-selector-class,
.hljs-type { color: var(--syntax-title); }
.hljs-emphasis { font-style: italic; }
.hljs-strong { font-weight: 600; }

/* ========================================
   Loading State
======================================== */

.loading {
  color: var(--mid);
  font-family: "Fragment Mono", "Courier New", monospace;
  font-size: 12px;
  padding: 40px 0;
  opacity: 0.6;
}

/* =============================================
   响应式 — 完整 5 断点策略
   ≥1440 / 1024~1439 / 768~1023 / 480~767 / <480
   ============================================= */

/* ── 宽屏（≥1440px）：版心不变，视觉与字号略强化 ── */
@media (min-width: 1440px) {
  .page {
    padding: 48px 48px 96px;
  }
  .logo-letter {
    font-size: 88px;
  }
  .entry-title {
    font-size: 34px;
  }
  .entry {
    padding: 30px 0;
  }
  .post-title {
    font-size: 46px;
  }
  .bio {
    font-size: 19px;
  }
  .post-content p,
  .post-content li {
    font-size: 16px;
    line-height: 1.9;
  }
  .post-content h1 { font-size: 30px; }
  .post-content h2 { font-size: 24px; }
  .post-content h3 { font-size: 19px; }
  .footer {
    margin-top: 72px;
  }
}

/* ── 平板（768~1023px）：减间距，缩字号，竹叶已弱化 ── */
@media (max-width: 1023px) {
  .page {
    padding: 28px 28px 72px;
  }
  .logo-letter {
    font-size: 62px;
  }
  .logo {
    margin: 6px 0 14px;
  }
  .bio {
    font-size: 17px;
    margin-bottom: 26px;
  }
  .divider {
    margin: 24px 0 28px;
  }
  .entry {
    padding: 22px 0;
  }
  .grouped-entries {
    gap: 28px;
  }
  .entry-title {
    font-size: 26px;
  }
  .post-title {
    font-size: 34px;
  }
  .post-meta {
    margin-bottom: 30px;
  }
  .post-shell {
    padding: 24px 26px 34px;
    margin-bottom: 40px;
  }
  .post-content h1 { font-size: 25px; }
  .post-content h2 { font-size: 20px; }
  .post-content h3 { font-size: 17px; }
  .footer {
    margin-top: 48px;
    padding-top: 18px;
  }
  .mode-indicator {
    top: 16px;
    right: 20px;
    gap: 8px;
  }
}

/* ── 手机（480~767px）：单列、加大行高、减字号 ── */
@media (max-width: 767px) {
  body {
    line-height: 1.85;
  }
  .page {
    padding: 20px 20px 64px;
  }
  .logo-letter {
    font-size: 48px;
  }
  .logo {
    margin: 4px 0 12px;
  }
  .bio {
    font-size: 16px;
    line-height: 1.9;
    margin-bottom: 20px;
  }
  .divider {
    margin: 20px 0 24px;
  }
  .entry {
    padding: 20px 0;
  }
  .grouped-entries {
    gap: 24px;
  }
  .entry-title {
    font-size: 22px;
    line-height: 1.45;
    margin-bottom: 6px;
  }
  .entry-excerpt {
    font-size: 13px;
    line-height: 1.7;
  }
  .post-back {
    margin-bottom: 22px;
  }
  .post-title {
    font-size: 28px;
    line-height: 1.38;
    margin-bottom: 12px;
  }
  .post-meta {
    margin-bottom: 26px;
  }
  .post-shell {
    padding: 20px 18px 28px;
    margin-bottom: 32px;
  }
  .post-content p {
    line-height: 1.9;
    margin-bottom: 1.3em;
  }
  .post-content li {
    line-height: 1.85;
  }
  .post-content h1 { font-size: 22px; }
  .post-content h2 { font-size: 19px; }
  .post-content h3 { font-size: 17px; }
  .post-content h4 { font-size: 15px; }
  .post-content pre {
    padding: 16px 18px;
  }
  .copy-btn {
    top: 8px;
    right: 8px;
    opacity: 1;
  }
  .post-content blockquote {
    padding-left: 14px;
  }
  .footer {
    margin-top: 40px;
    padding-top: 16px;
  }
  .mode-indicator {
    top: 14px;
    right: 16px;
    gap: 2px;
  }
  .subtle-link.mode-label {
    font-size: 8px;
    margin-right: 3px;
  }
}

/* ── 小屏手机（<480px）：极简，竹叶已接近隐藏 ── */
@media (max-width: 479px) {
  .page {
    padding: 16px 16px 52px;
  }
  .logo-letter {
    font-size: 42px;
  }
  .bio {
    font-size: 15px;
    margin-bottom: 18px;
  }
  .divider {
    margin: 16px 0 20px;
  }
  .entry {
    padding: 18px 0;
  }
  .grouped-entries {
    gap: 20px;
  }
  .entry-title {
    font-size: 20px;
    line-height: 1.45;
  }
  .post-title {
    font-size: 24px;
    line-height: 1.4;
  }
  .post-shell {
    padding: 16px 14px 24px;
    margin-bottom: 28px;
  }
  .post-content h1 { font-size: 20px; }
  .post-content h2 { font-size: 17px; }
  .post-content h3 { font-size: 15px; }
  /* 代码块小屏下全宽，去除圆角提升可读性 */
  .post-content pre {
    padding: 14px 16px;
    margin-left: -14px;
    margin-right: -14px;
    border-radius: 0;
    border-left: none;
    border-right: none;
  }
  .footer {
    margin-top: 32px;
    padding-top: 14px;
  }
  .mode-indicator {
    top: 12px;
    right: 12px;
    gap: 2px;
  }
  .subtle-link.mode-label {
    display: none; /* 极小屏隐藏 MODE 标签 */
  }
  /* 小屏竹枝图标略缩小 */
  .bamboo-icon {
    width: 13px;
    height: 18px;
  }
}