/* ===========================================================
   Personal site — 二次元风 (anime/2D aesthetic)
   Soft pastel gradients, glassmorphism, sakura petals,
   bouncy micro-interactions, rounded font, kawaii mascot.
   Zero deps, no build step.
   =========================================================== */

:root {
  --primary: #ff7eb6;      /* sakura pink   */
  --primary-2: #b18cff;    /* lavender      */
  --primary-3: #6ec3ff;    /* sky blue      */
  --primary-rgb: 255, 126, 182;
  --radius: 22px;
  --radius-sm: 14px;
  --maxw: 1020px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --font-round: "Yuanti SC", "Hiragino Maru Gothic ProN", "Quicksand",
    "PingFang SC", "PingFang SC", var(--font);
  --grad: linear-gradient(135deg, var(--primary), var(--primary-2) 52%, var(--primary-3));
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ---------- Light ---------- */
:root,
[data-theme="light"] {
  --bg-1: #fff1f8;
  --bg-2: #f3ecff;
  --bg-3: #eaf4ff;
  --surface: rgba(255, 255, 255, 0.66);
  --surface-2: rgba(255, 255, 255, 0.5);
  --text: #41304a;
  --text-soft: #8a7a92;
  --border: rgba(255, 140, 200, 0.22);
  --shadow-sm: 0 4px 14px rgba(255, 126, 182, 0.1);
  --shadow: 0 10px 34px rgba(177, 140, 255, 0.18), 0 2px 8px rgba(0, 0, 0, 0.04);
  --blob-1: rgba(255, 126, 182, 0.28);
  --blob-2: rgba(177, 140, 255, 0.26);
  --blob-3: rgba(110, 195, 255, 0.24);
}

/* ---------- Dark ---------- */
[data-theme="dark"] {
  --bg-1: #1b1226;
  --bg-2: #1a1430;
  --bg-3: #141a2e;
  --surface: rgba(45, 34, 62, 0.55);
  --surface-2: rgba(60, 46, 82, 0.5);
  --text: #f3e9f7;
  --text-soft: #b6a6c4;
  --border: rgba(255, 158, 199, 0.22);
  --shadow-sm: 0 4px 14px rgba(0, 0, 0, 0.35);
  --shadow: 0 12px 38px rgba(177, 140, 255, 0.22), 0 2px 10px rgba(0, 0, 0, 0.4);
  --blob-1: rgba(255, 126, 182, 0.22);
  --blob-2: rgba(177, 140, 255, 0.2);
  --blob-3: rgba(110, 195, 255, 0.18);
  --grad: linear-gradient(135deg, #ff9ec7, #c4a3ff 52%, #8fd0ff);
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
img { max-width: 100%; height: auto; }

body {
  font-family: var(--font);
  background:
    radial-gradient(120% 80% at 0% 0%, var(--bg-3), transparent 55%),
    radial-gradient(120% 90% at 100% 0%, var(--bg-1), transparent 50%),
    linear-gradient(160deg, var(--bg-2), var(--bg-1));
  background-attachment: fixed;
  color: var(--text);
  line-height: 1.75;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: color 0.4s ease;
  position: relative;
  overflow-x: hidden;
}

::selection { background: rgba(var(--primary-rgb), 0.28); color: var(--text); }

/* soft floating colour blobs */
body::before,
body::after {
  content: "";
  position: fixed;
  width: 52vw; height: 52vw;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.8;
  z-index: -2;
  pointer-events: none;
}
body::before { background: var(--blob-1); top: -18vw; left: -14vw; animation: float1 24s ease-in-out infinite; }
body::after { background: var(--blob-2); bottom: -20vw; right: -16vw; animation: float2 28s ease-in-out infinite; }
@keyframes float1 { 50% { transform: translate(6vw, 5vw); } }
@keyframes float2 { 50% { transform: translate(-5vw, -4vw); } }

a { color: inherit; text-decoration: none; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }

/* ---------- Sakura petals ---------- */
.petals { position: fixed; inset: 0; overflow: hidden; pointer-events: none; z-index: -1; }
.petal {
  position: absolute; top: -8vh;
  width: 13px; height: 13px;
  background: linear-gradient(135deg, #ffd1e6, var(--primary));
  border-radius: 100% 0 100% 0;
  opacity: 0.85;
  animation: fall linear infinite;
  will-change: transform;
}
@keyframes fall {
  0%   { transform: translateY(-10vh) translateX(0) rotate(0deg); }
  50%  { transform: translateY(50vh) translateX(40px) rotate(180deg); }
  100% { transform: translateY(112vh) translateX(-20px) rotate(360deg); }
}

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  background: color-mix(in srgb, var(--bg-1) 70%, transparent);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand {
  font-family: var(--font-round);
  font-weight: 800; font-size: 1.12rem; letter-spacing: 0.01em;
  display: flex; align-items: center; gap: 9px;
}
.brand .dot {
  width: 11px; height: 11px; border-radius: 50%; background: var(--grad);
  box-shadow: 0 0 10px rgba(var(--primary-rgb), 0.6);
}
.nav-links { display: flex; align-items: center; gap: 2px; }
.nav-links a {
  position: relative;
  padding: 8px 14px;
  color: var(--text-soft);
  font-weight: 600; font-size: 0.92rem;
  border-radius: 999px;
  transition: color 0.2s ease, background 0.2s ease;
}
.nav-links a:hover { color: var(--text); background: var(--surface-2); }
.nav-links a.active { color: var(--primary); }
.nav-links a.active::after {
  content: ""; position: absolute; left: 14px; right: 14px; bottom: 3px;
  height: 3px; border-radius: 3px; background: var(--grad);
}

.theme-btn {
  margin-left: 6px;
  width: 40px; height: 40px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--surface);
  color: var(--primary);
  cursor: pointer;
  display: grid; place-items: center;
  box-shadow: var(--shadow-sm);
  transition: color 0.2s ease, background 0.2s ease, transform 0.4s var(--ease-bounce);
}
.theme-btn:hover { color: var(--primary-2); background: var(--surface-2); transform: rotate(20deg) scale(1.08); }
.theme-btn svg { width: 19px; height: 19px; }

/* ---------- Hero ---------- */
.hero { padding: 88px 0 60px; text-align: center; position: relative; }
.status {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 16px; margin-bottom: 26px;
  border: 1px solid var(--border); border-radius: 999px;
  background: var(--surface); backdrop-filter: blur(8px);
  box-shadow: var(--shadow-sm);
  font-size: 0.84rem; color: var(--text-soft); font-weight: 600;
}
.status .live {
  width: 8px; height: 8px; border-radius: 50%; background: #4ade80;
  box-shadow: 0 0 0 3px rgba(74, 222, 128, 0.2);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse { 50% { box-shadow: 0 0 0 6px rgba(74, 222, 128, 0.05); } }

.avatar-wrap { position: relative; width: 132px; height: 132px; margin: 0 auto 26px; }
.avatar {
  width: 118px; height: 118px; margin: 7px auto;
  border-radius: 50%;
  background: var(--grad);
  display: grid; place-items: center;
  font-family: var(--font-round);
  font-size: 2.6rem; font-weight: 800; color: #fff;
  box-shadow: 0 0 0 6px var(--surface), 0 12px 28px rgba(0, 0, 0, 0.12);
  animation: bob 5s ease-in-out infinite;
  overflow: hidden;
}
.avatar img { width: 100%; height: 100%; border-radius: 50%; object-fit: cover; display: block; }
@keyframes bob { 50% { transform: translateY(-8px); } }
.avatar-wrap .ring {
  position: absolute; inset: 0; border-radius: 50%;
  background: conic-gradient(from 0deg, var(--primary), var(--primary-2), var(--primary-3), var(--primary));
  -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 5px), #000 calc(100% - 4px));
  mask: radial-gradient(farthest-side, transparent calc(100% - 5px), #000 calc(100% - 4px));
  animation: spin 9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* kawaii mascot — replace with your own character image if you like */
.mascot {
  position: absolute; right: -6px; bottom: -4px;
  width: 52px; height: 52px;
  animation: bob 4s ease-in-out infinite;
}
.mascot-face {
  width: 100%; height: 100%; border-radius: 50%;
  background: linear-gradient(135deg, #fff, #ffe3f1);
  border: 2px solid rgba(255, 255, 255, 0.9);
  box-shadow: 0 6px 16px rgba(177, 140, 255, 0.35);
  position: relative;
}
.mascot-face .eye { position: absolute; top: 19px; width: 5px; height: 7px; border-radius: 50%; background: #5b4a63; }
.mascot-face .eye.l { left: 15px; } .mascot-face .eye.r { right: 15px; }
.mascot-face .blush { position: absolute; top: 27px; width: 8px; height: 5px; border-radius: 50%; background: rgba(255, 126, 182, 0.7); }
.mascot-face .blush.l { left: 10px; } .mascot-face .blush.r { right: 10px; }
.mascot-face .mouth { position: absolute; left: 21px; top: 27px; width: 10px; height: 5px; border: 2px solid #5b4a63; border-top: none; border-radius: 0 0 10px 10px; }

.hero h1 {
  font-family: var(--font-round);
  font-size: clamp(2.2rem, 5.5vw, 3.3rem);
  font-weight: 800; letter-spacing: 0.01em; line-height: 1.18;
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.hero .tagline {
  margin: 18px auto 0; max-width: 580px;
  color: var(--text-soft); font-size: 1.05rem; line-height: 1.8;
}
.socials { margin-top: 30px; display: flex; gap: 11px; justify-content: center; flex-wrap: wrap; }
.socials a {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 17px;
  border: 1px solid var(--border); border-radius: 999px;
  background: var(--surface); backdrop-filter: blur(8px);
  color: var(--text-soft); font-weight: 600; font-size: 0.9rem;
  box-shadow: var(--shadow-sm);
  transition: color 0.2s ease, border-color 0.2s ease, transform 0.35s var(--ease-bounce), box-shadow 0.2s ease;
}
.socials a:hover {
  color: var(--primary); border-color: rgba(255, 126, 182, 0.55);
  transform: translateY(-3px); box-shadow: 0 10px 24px rgba(255, 126, 182, 0.25);
}
.socials svg { width: 16px; height: 16px; fill: currentColor; }

/* ---------- Sections ---------- */
.section { padding: 46px 0; }
.section-title {
  font-family: var(--font-round);
  font-size: 1.4rem; font-weight: 800; margin-bottom: 24px;
  display: flex; align-items: center; gap: 11px;
}
.section-title::before {
  content: "✦"; color: #fff; font-size: 0.95rem;
  width: 26px; height: 26px; display: grid; place-items: center;
  border-radius: 9px; background: var(--grad);
  box-shadow: 0 4px 12px rgba(255, 126, 182, 0.4);
}

.card {
  background: var(--surface);
  backdrop-filter: blur(14px) saturate(160%);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: var(--shadow-sm);
}
.about p { color: var(--text-soft); }

/* about page extras */
.tags { display: flex; flex-wrap: wrap; gap: 9px; }
.now-list { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.now-list li { display: flex; align-items: center; gap: 10px; color: var(--text-soft); }
.now-list li .live { flex-shrink: 0; }

/* ---------- Post grid ---------- */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 20px; }
.post-card {
  background: var(--surface);
  backdrop-filter: blur(14px) saturate(160%);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  display: flex; flex-direction: column;
  cursor: pointer;
  transition: transform 0.35s var(--ease-bounce), box-shadow 0.35s ease, border-color 0.35s ease;
}
.post-card:hover {
  transform: translateY(-6px) scale(1.015);
  border-color: rgba(255, 126, 182, 0.55);
  box-shadow: 0 18px 42px rgba(177, 140, 255, 0.26);
}
.post-card h3 {
  font-family: var(--font-round);
  font-size: 1.18rem; font-weight: 700; line-height: 1.4; color: var(--text); margin-bottom: 10px;
}
.post-card .excerpt { color: var(--text-soft); font-size: 0.95rem; line-height: 1.7; flex: 1; }
.post-meta { margin-top: 16px; display: flex; align-items: center; gap: 10px; flex-wrap: wrap; font-size: 0.8rem; color: var(--text-soft); }
.tag {
  padding: 3px 11px; border-radius: 999px;
  background: linear-gradient(135deg, rgba(255, 126, 182, 0.18), rgba(177, 140, 255, 0.18));
  color: var(--primary); font-weight: 700; font-size: 0.78rem;
}

/* ---------- Post detail ---------- */
.post-detail { padding: 40px 0 72px; }
.post-detail h1 {
  font-family: var(--font-round);
  font-size: clamp(1.9rem, 4.2vw, 2.6rem); margin: 14px 0;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; color: transparent;
}
.post-detail .post-meta { margin-bottom: 26px; }
.prose { font-size: 1.05rem; color: var(--text); }
.prose h2 { margin: 30px 0 12px; font-size: 1.35rem; font-family: var(--font-round); }
.prose p { margin: 14px 0; color: var(--text-soft); }
.prose code { background: var(--surface-2); padding: 2px 7px; border-radius: 6px; font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 0.92em; color: var(--primary-2); }
.prose pre { background: var(--surface-2); padding: 16px; border-radius: var(--radius-sm); overflow-x: auto; margin: 16px 0; }
.prose pre code { background: none; padding: 0; color: var(--text); }
.prose ul { margin: 14px 0 14px 22px; color: var(--text-soft); }
.back-link { display: inline-block; margin-bottom: 10px; color: var(--primary); font-weight: 600; }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--border); padding: 32px 0; text-align: center; color: var(--text-soft); font-size: 0.88rem; }
.footer a { color: var(--primary); font-weight: 600; }

.empty { text-align: center; color: var(--text-soft); padding: 50px 0; }

/* ---------- Mobile ---------- */
@media (max-width: 600px) {
  body { background-attachment: scroll; }   /* iOS 上 fixed 背景会卡 */
  .container { padding: 0 16px; }

  .nav-inner { height: 56px; gap: 6px; }
  .brand {
    font-size: 1rem; gap: 7px; letter-spacing: -0.01em;
    white-space: nowrap; min-width: 0; overflow: hidden; text-overflow: ellipsis; flex-shrink: 1;
  }
  .brand .dot { width: 9px; height: 9px; flex-shrink: 0; }
  .nav-links { flex-shrink: 0; gap: 0; }
  .nav-links a { padding: 7px 9px; font-size: 0.82rem; }
  .theme-btn { width: 36px; height: 36px; margin-left: 4px; }
  .theme-btn svg { width: 17px; height: 17px; }

  .hero { padding: 54px 0 40px; }
  .hero h1 {
    font-size: clamp(1.7rem, 7vw, 2.4rem);
    padding: 0 2px; text-wrap: balance;
  }
  .hero .tagline { font-size: 1rem; margin-top: 14px; }
  .status { font-size: 0.78rem; padding: 5px 13px; margin-bottom: 22px; }
  .socials { gap: 9px; margin-top: 24px; }
  .socials a { padding: 8px 14px; font-size: 0.85rem; }

  .section { padding: 34px 0; }
  .section-title { font-size: 1.2rem; margin-bottom: 18px; gap: 9px; }
  .card { padding: 20px; }

  .grid { grid-template-columns: 1fr; gap: 16px; }
  .post-card { padding: 20px; }
  .post-card h3 { font-size: 1.1rem; }
  .mascot { right: 2px; }

  .post-detail { padding: 26px 0 56px; }
  .post-detail h1 { font-size: clamp(1.6rem, 6vw, 2rem); text-wrap: balance; }
  .prose { font-size: 1rem; overflow-wrap: break-word; word-break: break-word; }
  .prose p, .prose li { line-height: 1.85; }
  .prose pre { font-size: 0.85rem; }

  .footer { font-size: 0.82rem; padding: 26px 0; }
  .to-top { right: 16px; bottom: 16px; width: 42px; height: 42px; }
}

@media (max-width: 360px) {
  .brand { font-size: 0.9rem; }
  .nav-links a { padding: 6px 7px; font-size: 0.78rem; }
  .hero h1 { font-size: 1.6rem; }
}

/* 触屏设备：去掉点按后“粘住”的 hover 位移/旋转 */
@media (hover: none) {
  .post-card:hover { transform: none; box-shadow: var(--shadow-sm); }
  .socials a:hover { transform: none; }
  .theme-btn:hover { transform: none; color: var(--primary); }
}

/* ---------- Reading progress ---------- */
.progress {
  position: fixed; top: 0; left: 0; height: 3px; width: 0;
  background: var(--grad);
  box-shadow: 0 0 10px rgba(255, 126, 182, 0.6);
  z-index: 100; transition: width 0.1s linear;
}

/* ---------- Back to top ---------- */
.to-top {
  position: fixed; right: 22px; bottom: 22px; z-index: 60;
  width: 46px; height: 46px; border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface); backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--primary); cursor: pointer;
  display: grid; place-items: center;
  box-shadow: var(--shadow);
  opacity: 0; transform: translateY(16px) scale(0.9);
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.35s var(--ease-bounce), color 0.2s ease;
}
.to-top.show { opacity: 1; transform: none; pointer-events: auto; }
.to-top:hover { color: var(--primary-2); }
.to-top svg { width: 20px; height: 20px; }

/* ---------- Reveal on scroll ---------- */
/* 仅当 JS 可用（html.js）时才隐藏，关掉 JS 内容仍可见 */
.js .reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.6s ease, transform 0.6s ease; }
.js .reveal.in { opacity: 1; transform: none; }

/* ---------- Reading time + TOC ---------- */
.prose h2 { scroll-margin-top: 84px; }
.read-time {
  margin-left: auto;
  padding-left: 10px;
  border-left: 1px solid var(--border);
  color: var(--text-soft);
  font-size: 0.78rem;
}
.toc {
  background: var(--surface);
  backdrop-filter: blur(14px) saturate(160%);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin-bottom: 26px;
  box-shadow: var(--shadow-sm);
}
.toc-title {
  font-family: var(--font-round);
  font-weight: 800; font-size: 1rem; margin-bottom: 10px;
  color: var(--text);
}
.toc ul { list-style: none; display: flex; flex-direction: column; gap: 7px; }
.toc a { color: var(--text-soft); font-size: 0.92rem; font-weight: 600; transition: color 0.2s ease; }
.toc a:hover { color: var(--primary); }
.toc a::before { content: "✦ "; color: var(--primary); }

/* ---------- Keyboard focus (a11y) ---------- */
:focus-visible { outline: 2px solid var(--primary); outline-offset: 3px; border-radius: 6px; }
/* 装饰元素（头像光环/吉祥物）不可聚焦，屏蔽焦点环，避免误显粉色光晕 */
.avatar-wrap, .avatar-wrap * { outline: none; }

@media (prefers-reduced-motion: reduce) {
  .js .reveal { opacity: 1; transform: none; transition: none; }
  .progress, .to-top { display: none; }
}