/* =========================================================================
   果酱空间 / GUOJIANG SPACE  —  style.css
   深色调 · Comic Sans 手写感 · 霓虹点缀 · 玻璃拟态 · 流体兜底渐变
   设计令牌集中在 :root，便于整体换肤与统一调参。
   ========================================================================= */

:root {
  /* 调色板 */
  --bg: #1E1F21;            /* 页面主底 */
  --bg-deep: #06070d;       /* 更深兜底 */
  --ink: #ECEDEF;           /* 主文字 */
  --muted: #9aa0a8;         /* 次要文字 */
  --line: rgba(255, 255, 255, 0.08);

  /* 霓虹双色 */
  --neon-pink: #ff2e88;
  --neon-cyan: #18e0ff;
  --neon-grad: linear-gradient(110deg, var(--neon-pink), var(--neon-cyan));

  /* 玻璃拟态 */
  --glass: rgba(16, 17, 22, 0.55);
  --glass-strong: rgba(16, 17, 22, 0.78);
  --glass-border: rgba(255, 255, 255, 0.10);

  /* 动效 */
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --t-fast: 0.18s;
  --t: 0.4s;

  /* 排版 */
  --font: "Comic Sans MS", "Helvetica Neue", "Microsoft YaHei", -apple-system,
          BlinkMacSystemFont, "Segoe UI", sans-serif;
  --maxw: 1080px;

  /* 翻页书动效（电子书 / 影集共用） */
  --book-t: 0.75s;
  --book-ease: cubic-bezier(0.65, 0, 0.35, 1);
}

/* 仅供屏幕阅读器（模态框标题等） */
.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;
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  color: var(--ink);
  background-color: var(--bg);
  /* 即使 WebGL 流体失败，页面依然精致：径向渐变兜底 */
  background-image: radial-gradient(circle at 30% 20%, #15161a, var(--bg-deep) 70%);
  background-attachment: fixed;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
body.locked { overflow: hidden; height: 100vh; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

/* 入口屏期间隐藏主内容 */
body.locked #main,
body.locked .nav { opacity: 0; pointer-events: none; }

/* ---------- 流体背景画布 ---------- */
#background {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  display: block;
}

/* ---------- 自定义光标光晕 ---------- */
#cursor-glow {
  position: fixed;
  top: 0; left: 0;
  width: 26px; height: 26px;
  margin: -13px 0 0 -13px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 46, 136, 0.55), rgba(24, 224, 255, 0.18) 45%, transparent 70%);
  mix-blend-mode: screen;
  pointer-events: none;
  z-index: 60;
  opacity: 0;
  transition: opacity var(--t) var(--ease);
  will-change: transform;
}
#cursor-glow.show { opacity: 1; }

/* ---------- GitHub 角标 ---------- */
.github-corner {
  position: fixed;
  top: 0; right: 0;
  z-index: 50;
  width: 80px; height: 80px;
  color: #fff;            /* octo 主体色 */
  transition: color var(--t) var(--ease);
}
.github-corner svg { fill: var(--neon-pink); transition: fill var(--t) var(--ease); }
.github-corner:hover svg { fill: var(--neon-cyan); }
.github-corner .octo-arm {
  transform-origin: 130px 106px;
  animation: octo-wave 560ms ease-in-out 0s 2;
}
@keyframes octo-wave {
  0%, 100% { transform: rotate(0); }
  20%, 60% { transform: rotate(-25deg); }
  40%, 80% { transform: rotate(10deg); }
}
@media (prefers-reduced-motion: reduce) {
  .github-corner .octo-arm { animation: none; }
  html { scroll-behavior: auto; }
}

/* ====================== 入口屏 PRESS START ====================== */
#intro {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: radial-gradient(circle at 50% 40%, rgba(255, 46, 136, 0.10), rgba(6, 7, 13, 0.92) 70%);
  backdrop-filter: blur(2px);
  transition: opacity 0.7s var(--ease), visibility 0.7s var(--ease);
}
#intro.hide { opacity: 0; visibility: hidden; pointer-events: none; }
.intro-inner { padding: 24px; transform: translateY(-2vh); }
.intro-title {
  font-size: clamp(2.6rem, 8vw, 5rem);
  margin: 0;
  letter-spacing: 0.04em;
  background: var(--neon-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.intro-sub {
  margin: 6px 0 0;
  font-size: clamp(0.9rem, 2.4vw, 1.2rem);
  letter-spacing: 0.5em;
  color: var(--muted);
  text-transform: uppercase;
}
.intro-tag {
  margin: 18px 0 34px;
  font-size: clamp(1rem, 3vw, 1.4rem);
  color: var(--ink);
}
.press-start {
  position: relative;
  padding: 16px 40px;
  font-size: clamp(1rem, 2.6vw, 1.3rem);
  letter-spacing: 0.22em;
  color: var(--ink);
  background: transparent;
  border: 2px solid var(--neon-pink);
  border-radius: 999px;
  box-shadow: 0 0 14px rgba(255, 46, 136, 0.55), inset 0 0 10px rgba(255, 46, 136, 0.25);
  transition: transform var(--t-fast) var(--ease), box-shadow var(--t) var(--ease), color var(--t) var(--ease);
  animation: pulse-glow 2.4s var(--ease) infinite;
}
.press-start:hover {
  color: #fff;
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 0 26px rgba(24, 224, 255, 0.7), inset 0 0 14px rgba(24, 224, 255, 0.3);
  border-color: var(--neon-cyan);
}
@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 14px rgba(255, 46, 136, 0.5), inset 0 0 10px rgba(255, 46, 136, 0.22); }
  50% { box-shadow: 0 0 26px rgba(255, 46, 136, 0.85), inset 0 0 12px rgba(255, 46, 136, 0.35); }
}

/* ====================== 顶部导航 ====================== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 45;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px clamp(16px, 5vw, 42px);
  background: var(--glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--glass-border);
  transition: opacity var(--t) var(--ease), transform var(--t) var(--ease);
}
.brand {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  background: var(--neon-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.nav-links { display: flex; gap: clamp(12px, 3vw, 30px); flex-wrap: wrap; }
.nav-links a {
  position: relative;
  color: var(--muted);
  font-size: 0.98rem;
  padding: 4px 2px;
  transition: color var(--t-fast) var(--ease);
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 100%; height: 2px;
  background: var(--neon-grad);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--t) var(--ease);
}
.nav-links a:hover { color: var(--ink); }
.nav-links a:hover::after { transform: scaleX(1); }

/* ====================== 主分区 ====================== */
#main { position: relative; z-index: 10; }
.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(70px, 12vh, 130px) clamp(18px, 5vw, 32px);
}
.section-title {
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  margin: 0 0 32px;
  display: flex;
  align-items: baseline;
  gap: 14px;
}
.sec-num {
  font-size: 0.7em;
  font-weight: 800;
  letter-spacing: 0.1em;
  background: var(--neon-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 0 18px rgba(255, 46, 136, 0.45);
}

/* 入场动画（由 IntersectionObserver 触发 .in-view） */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in-view { opacity: 1; transform: none; }

/* ---------- HERO ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-align: center;
  align-items: center;
}
.eyebrow {
  margin: 0 0 10px;
  letter-spacing: 0.5em;
  font-size: clamp(0.7rem, 2vw, 0.95rem);
  color: var(--neon-cyan);
  text-transform: uppercase;
}
.hero-name {
  margin: 0;
  font-size: clamp(3.2rem, 12vw, 7rem);
  line-height: 1.05;
  letter-spacing: 0.02em;
  background: var(--neon-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 26px rgba(255, 46, 136, 0.35));
}
.hero-role {
  margin: 14px 0 0;
  font-size: clamp(1rem, 3vw, 1.5rem);
  color: var(--ink);
}
.typing {
  margin: 18px 0 0;
  font-size: clamp(1rem, 3vw, 1.4rem);
  color: var(--muted);
  min-height: 1.6em;
}
.typing .caret { color: var(--neon-pink); animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.scroll-hint {
  margin-top: 48px;
  font-size: 1.6rem;
  color: var(--neon-cyan);
  animation: bob 2s var(--ease) infinite;
}
@keyframes bob { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(10px); } }

/* ---------- ABOUT ---------- */
.about-text {
  font-size: clamp(1rem, 2.6vw, 1.25rem);
  color: var(--ink);
  max-width: 64ch;
  margin: 0;
}

/* ---------- PROJECTS 卡片 ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 22px;
}
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 26px 24px;
  border-radius: 18px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: transform var(--t) var(--ease), border-color var(--t) var(--ease), box-shadow var(--t) var(--ease);
  overflow: hidden;
}
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 18px;
  padding: 1px;
  background: var(--neon-grad);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity var(--t) var(--ease);
  pointer-events: none;
}
.card:hover {
  transform: translateY(-6px);
  border-color: transparent;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.45), 0 0 22px rgba(255, 46, 136, 0.18);
}
.card:hover::before { opacity: 1; }
.card.clickable { cursor: pointer; }
.card-title { margin: 0; font-size: 1.35rem; color: var(--ink); }
.card-desc { margin: 0; color: var(--muted); font-size: 0.98rem; flex: 1; }
.card-links { display: flex; flex-wrap: wrap; gap: 10px; }
.link-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--glass-border);
  color: var(--ink);
  font-size: 0.92rem;
  background: rgba(255, 255, 255, 0.03);
  transition: border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}
.link-btn:hover {
  border-color: var(--neon-cyan);
  color: #fff;
  transform: translateY(-2px);
}
.card-tag {
  position: absolute;
  top: 16px; right: 16px;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  padding: 3px 10px;
  border-radius: 999px;
  color: var(--neon-cyan);
  border: 1px solid rgba(24, 224, 255, 0.4);
  background: rgba(24, 224, 255, 0.07);
}

/* ---------- CONTACT 社交 ---------- */
.socials { display: flex; flex-wrap: wrap; gap: 16px; }
.social {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  border-radius: 14px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  color: var(--ink);
  font-size: 1rem;
  transition: transform var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease);
}
.social:hover,
.social:focus-visible {
  transform: translateY(-3px);
  border-color: var(--neon-pink);
  box-shadow: 0 0 18px rgba(255, 46, 136, 0.3);
}
.social svg { width: 24px; height: 24px; fill: currentColor; }
.social.wechat { color: var(--muted); }
.social.wechat:hover,
.social.wechat:focus-visible { border-color: var(--neon-cyan); box-shadow: 0 0 18px rgba(24, 224, 255, 0.3); color: var(--ink); }

/* 社交 hover 二维码 */
.social-hover-img {
  position: absolute;
  bottom: calc(100% + 14px);
  left: 50%;
  transform: translateX(-50%) scale(0.92) translateY(8px);
  width: 170px;
  height: auto;
  max-width: none;
  border-radius: 14px;
  border: 1px solid var(--glass-border);
  background: var(--glass);
  box-shadow: 0 20px 50px rgba(0,0,0,0.55), 0 0 0 1px rgba(255,255,255,0.06);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--t-fast) var(--ease), transform var(--t-fast) var(--ease), visibility var(--t-fast);
  z-index: 100;
}
.social:hover .social-hover-img,
.social:focus-visible .social-hover-img {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) scale(1) translateY(0);
}
@media (max-width: 640px) {
  .social-hover-img { width: 140px; }
}

.footer {
  text-align: center;
  padding: 40px 20px 60px;
  color: var(--muted);
  font-size: 0.9rem;
  border-top: 1px solid var(--line);
  margin-top: 40px;
}

/* ====================== 模态框通用 ====================== */
.modal, .lightbox {
  position: fixed;
  inset: 0;
  z-index: 70;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.modal[hidden], .lightbox[hidden] { display: none; }
.modal-backdrop, .lightbox-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(4, 5, 10, 0.66);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  animation: fade-in var(--t) var(--ease);
}
@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }
.modal-panel {
  position: relative;
  width: min(860px, 100%);
  max-height: 86vh;
  display: flex;
  flex-direction: column;
  border-radius: 20px;
  background: var(--glass-strong);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.55), 0 0 30px rgba(255, 46, 136, 0.12);
  animation: pop-in 0.45s var(--ease);
  overflow: hidden;
}
@keyframes pop-in { from { opacity: 0; transform: translateY(20px) scale(0.97); } to { opacity: 1; transform: none; } }
.modal-close {
  position: absolute;
  top: 14px; right: 16px;
  z-index: 2;
  width: 38px; height: 38px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: rgba(255, 255, 255, 0.05);
  color: var(--ink);
  font-size: 1.4rem;
  line-height: 1;
  transition: transform var(--t-fast) var(--ease), color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}
.modal-close:hover { transform: rotate(90deg); color: var(--neon-pink); border-color: var(--neon-pink); }

/* ====================== 3D 翻页书（电子书 / 影集共用） ====================== */
.modal-panel.book-panel {
  width: min(540px, 100%);
  overflow: hidden auto;
}
.book3d {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  padding: 26px 22px 22px;
}
.book3d-stage {
  position: relative;
  width: 100%;
  max-width: 460px;
  aspect-ratio: 3 / 4;
  margin: 0 auto;
  perspective: 2200px;
}
.book3d-page {
  position: absolute;
  inset: 0;
  transform-origin: left center;
  transform-style: preserve-3d;
  will-change: transform;
}
.book3d-page.role-under { z-index: 1; pointer-events: none; }
.book3d-page.role-top { z-index: 2; }
.book3d-page.flipping { filter: drop-shadow(0 28px 42px rgba(0, 0, 0, 0.55)); }
.book3d-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--glass-border);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.45), inset 0 0 0 1px rgba(255, 255, 255, 0.03);
  display: flex;
}
.book3d-face.front { transform: rotateY(0deg); }
.book3d-face.back {
  transform: rotateY(180deg);
  background: linear-gradient(135deg, #15161c, #0c0d13);
}
.bk-inside {
  width: 100%; height: 100%;
  background:
    linear-gradient(135deg, rgba(255, 46, 136, 0.06), transparent 42%),
    linear-gradient(315deg, rgba(24, 224, 255, 0.06), transparent 42%),
    #101116;
}

/* 封面 */
.bk-cover {
  width: 100%; height: 100%;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; padding: 30px;
  background:
    radial-gradient(circle at 50% 28%, rgba(255, 46, 136, 0.12), transparent 60%),
    linear-gradient(160deg, #14151c, #0a0b11);
  color: var(--ink);
}
.bk-cover--album {
  background:
    radial-gradient(circle at 50% 28%, rgba(24, 224, 255, 0.12), transparent 60%),
    linear-gradient(160deg, #14151c, #0a0b11);
}
.bk-cover-kicker { margin: 0 0 16px; letter-spacing: 0.35em; font-size: 0.72rem; text-transform: uppercase; color: var(--neon-cyan); }
.bk-cover-title {
  margin: 0; font-size: clamp(1.6rem, 6vw, 2.4rem); line-height: 1.2;
  background: var(--neon-grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.bk-cover-author { margin: 14px 0 0; color: var(--muted); font-size: 0.98rem; }
.bk-cover-sub { margin: 8px 0 0; color: var(--muted); font-size: 0.9rem; }
.bk-cover-hint { margin: 28px 0 0; color: var(--neon-pink); font-size: 0.85rem; letter-spacing: 0.05em; }

/* 诗歌页 */
.bk-poem {
  width: 100%; height: 100%;
  display: flex; flex-direction: column; justify-content: center;
  padding: 34px 30px;
  background: linear-gradient(160deg, #16171e, #0c0d12);
  color: var(--ink);
}
.bk-poem-no { color: var(--neon-cyan); font-weight: 700; font-size: 0.9rem; letter-spacing: 0.08em; }
.bk-poem-cn { margin: 10px 0 14px; white-space: pre-line; font-size: clamp(1rem, 3.4vw, 1.18rem); line-height: 1.8; color: var(--ink); }
.bk-poem-en { margin: 0; white-space: pre-line; font-style: italic; color: var(--muted); font-size: clamp(0.9rem, 2.8vw, 1.02rem); line-height: 1.7; }
.bk-poem-end { margin: 18px 0 0; text-align: center; color: var(--neon-pink); letter-spacing: 0.4em; font-size: 0.95rem; }

/* 照片页（婚纱影集质感：大图居中、柔和暗角、轻投影） */
.bk-photo {
  width: 100%; height: 100%;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 12px; padding: 22px;
  background: linear-gradient(160deg, #15161c, #0b0c11);
}
.bk-photo-btn {
  position: relative; display: block; width: 100%;
  aspect-ratio: 4 / 5; max-height: 80%;
  padding: 0; border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 10px; overflow: hidden; cursor: zoom-in; background: #000;
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.5);
  transition: transform var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease);
}
.bk-photo-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.6), 0 0 22px rgba(24, 224, 255, 0.25);
}
.bk-photo-img { width: 100%; height: 100%; object-fit: cover; display: block; }
.bk-vignette {
  position: absolute; inset: 0; pointer-events: none;
  box-shadow: inset 0 0 60px rgba(0, 0, 0, 0.55);
  background: radial-gradient(ellipse at center, transparent 55%, rgba(0, 0, 0, 0.35) 100%);
}
.bk-photo-cap { margin: 0; color: var(--muted); font-size: 0.86rem; letter-spacing: 0.04em; }

/* 翻页工具栏（上/下一页 · 页码 · 可键盘聚焦） */
.book3d-toolbar { display: flex; align-items: center; gap: 16px; margin-top: 18px; }
.book3d-btn {
  padding: 10px 18px; border-radius: 999px;
  border: 1px solid var(--glass-border); background: rgba(255, 255, 255, 0.04);
  color: var(--ink); font-size: 0.92rem;
  transition: border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease),
              transform var(--t-fast) var(--ease), opacity var(--t-fast) var(--ease);
}
.book3d-btn:hover:not(:disabled) { transform: translateY(-2px); border-color: var(--neon-cyan); color: #fff; }
.book3d-btn:disabled { opacity: 0.35; cursor: not-allowed; }
.book3d-btn:focus-visible { outline: 2px solid var(--neon-cyan); outline-offset: 2px; }
.book3d-ind {
  min-width: 64px; text-align: center; color: var(--muted);
  font-size: 0.92rem; letter-spacing: 0.06em;
}

/* ---------- Lightbox ---------- */
.lightbox-img {
  position: relative;
  max-width: 92vw;
  max-height: 88vh;
  border-radius: 14px;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.6);
  animation: pop-in 0.4s var(--ease);
}
.lightbox-close {
  position: absolute;
  top: 22px; right: 26px;
  width: 46px; height: 46px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: rgba(255, 255, 255, 0.06);
  color: var(--ink);
  font-size: 1.8rem;
  line-height: 1;
  transition: transform var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
.lightbox-close:hover { transform: rotate(90deg); color: var(--neon-cyan); }

/* ---------- Toast 提示 ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 36px;
  transform: translate(-50%, 20px);
  z-index: 90;
  padding: 12px 22px;
  border-radius: 999px;
  background: var(--glass-strong);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--ink);
  font-size: 0.92rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--t) var(--ease), transform var(--t) var(--ease);
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ====================== 响应式 ====================== */
@media (max-width: 640px) {
  .nav { flex-direction: column; align-items: flex-start; gap: 8px; }
  .nav-links { gap: 14px; }
  .github-corner { width: 60px; height: 60px; }
  .gallery-head { align-items: flex-start; }
  .book3d { padding-left: 16px; padding-right: 16px; }
  .book3d-stage { max-width: 360px; }
}

/* ====================== 减弱动画偏好 ====================== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
  .reveal { opacity: 1; transform: none; }
  .caret { animation: none; }
  #cursor-glow { display: none !important; }
}