/* ==========================================================================
   2026 校园读书月 · 阅见世界
   移动端优先样式表  |  css/style.css
   ========================================================================== */

/* ---------- 1. 设计变量 ---------- */
:root {
  /* 色板：夜读紫 + 青瓷绿 + 玫粉 */
  --ink-900: #0b0a1c;
  --ink-800: #141333;
  --ink-700: #1d1b45;
  --ink-600: #2a2757;
  --ink-500: #3b3776;

  --paper: #ffffff;
  --paper-soft: rgba(255, 255, 255, 0.06);
  --paper-line: rgba(255, 255, 255, 0.12);

  --txt-1: #f4f3ff;
  --txt-2: #b9b6d8;
  --txt-3: #7e7aa8;

  --brand-1: #6c5ce7;
  --brand-2: #00c2a8;
  --brand-3: #ff6fb5;
  --brand-4: #ffb057;
  --grad-brand: linear-gradient(120deg, #6c5ce7 0%, #00c2a8 100%);
  --grad-warm: linear-gradient(120deg, #ff6fb5 0%, #ffb057 100%);
  --grad-text: linear-gradient(100deg, #a99cff 0%, #4fe3c8 45%, #ff9ad2 100%);

  --ok: #2ee6a8;
  --like: #ff5470;

  /* 尺寸与节奏 */
  --pad: 18px;
  --radius: 20px;
  --radius-sm: 14px;
  --radius-lg: 28px;
  --maxw: 640px;

  --sh-1: 0 2px 10px rgba(0, 0, 0, 0.25);
  --sh-2: 0 14px 34px -12px rgba(0, 0, 0, 0.65);
  --sh-glow: 0 12px 34px -8px rgba(108, 92, 231, 0.65);

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --safe-b: env(safe-area-inset-bottom, 0px);
  --safe-t: env(safe-area-inset-top, 0px);
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 64px;
}

body {
  margin: 0;
  min-height: 100%;
  background: var(--ink-900);
  color: var(--txt-1);
  font-family: "PingFang SC", "HarmonyOS Sans SC", "Noto Sans SC", "Microsoft YaHei",
               -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 15px;
  line-height: 1.65;
  letter-spacing: 0.01em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  text-rendering: optimizeLegibility;
}

body::before { /* 全站底色光晕 */
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(1100px 700px at 12% -8%, rgba(108, 92, 231, 0.38), transparent 60%),
    radial-gradient(900px 600px at 92% 8%, rgba(0, 194, 168, 0.22), transparent 62%),
    radial-gradient(800px 800px at 50% 108%, rgba(255, 111, 181, 0.18), transparent 60%),
    var(--ink-900);
}

img { max-width: 100%; display: block; border: 0; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; border: 0; background: none; cursor: pointer; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, p { margin: 0; }
svg { width: 1em; height: 1em; fill: none; stroke: currentColor; stroke-width: 2;
      stroke-linecap: round; stroke-linejoin: round; }

::selection { background: rgba(108, 92, 231, 0.55); color: #fff; }

.shell { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 var(--pad); }

/* 滚动条 */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, 0.18); border-radius: 99px; }

/* ---------- 3. 顶部进度条 & 导航 ---------- */
.progress {
  position: fixed; top: 0; left: 0; z-index: 60;
  height: 3px; width: 0%;
  background: var(--grad-text);
  box-shadow: 0 0 14px rgba(108, 92, 231, 0.9);
  transition: width 0.1s linear;
}

.topbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px;
  padding: calc(var(--safe-t) + 10px) var(--pad) 10px;
  background: rgba(11, 10, 28, 0.72);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid transparent;
  transform: translateY(-102%);
  transition: transform 0.45s var(--ease), border-color 0.3s;
}
.topbar.is-in { transform: none; border-bottom-color: var(--paper-line); }

.topbar__brand { display: flex; align-items: center; gap: 8px; font-weight: 700; }
.topbar__logo { font-size: 18px; }
.topbar__name { letter-spacing: 0.06em; }

.topbar__nav { display: flex; gap: 6px; }
.topbar__link {
  padding: 6px 12px; border-radius: 99px; font-size: 13px; color: var(--txt-2);
  border: 1px solid transparent; transition: 0.25s;
}
.topbar__link:active { transform: scale(0.94); }
.topbar__link.is-active {
  color: var(--txt-1); background: var(--paper-soft); border-color: var(--paper-line);
}

/* ---------- 4. Hero（读书月介绍页） ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex; flex-direction: column; justify-content: center;
  padding: calc(var(--safe-t) + 54px) 0 118px;
  overflow: hidden;
  isolation: isolate;
}

.hero__bg { position: absolute; inset: 0; z-index: -1; overflow: hidden; }

.blob {
  position: absolute; border-radius: 50%; filter: blur(58px); opacity: 0.55;
  animation: float 16s ease-in-out infinite;
}
.blob--1 { width: 62vw; height: 62vw; left: -18vw; top: -6vh; background: #6c5ce7; }
.blob--2 { width: 52vw; height: 52vw; right: -16vw; top: 24vh; background: #00c2a8; animation-delay: -5s; }
.blob--3 { width: 46vw; height: 46vw; left: 22vw; bottom: -10vh; background: #ff6fb5; animation-delay: -9s; }

@keyframes float {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
  33%      { transform: translate3d(4vw, -3vh, 0) scale(1.08); }
  66%      { transform: translate3d(-3vw, 3vh, 0) scale(0.95); }
}

.hero__grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(120% 90% at 50% 20%, #000 25%, transparent 78%);
  -webkit-mask-image: radial-gradient(120% 90% at 50% 20%, #000 25%, transparent 78%);
}

.hero__noise {
  position: absolute; inset: 0; opacity: 0.28; mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E");
}

.hero__inner { position: relative; width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 var(--pad); }

.hero__badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 14px; border-radius: 99px;
  font-size: 12.5px; letter-spacing: 0.04em; color: #d9d5ff;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid var(--paper-line);
  backdrop-filter: blur(8px);
}
.hero__badge .dot {
  width: 7px; height: 7px; border-radius: 50%; background: var(--ok);
  box-shadow: 0 0 0 0 rgba(46, 230, 168, 0.7);
  animation: pulse 2.2s infinite;
}
@keyframes pulse {
  70%  { box-shadow: 0 0 0 9px rgba(46, 230, 168, 0); }
  100% { box-shadow: 0 0 0 0 rgba(46, 230, 168, 0); }
}

.hero__title {
  margin: 18px 0 14px;
  font-size: clamp(34px, 11.5vw, 52px);
  line-height: 1.14;
  font-weight: 900;
  letter-spacing: -0.01em;
  text-wrap: balance;
}
.hero__title .grad {
  background: var(--grad-text);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
  background-size: 220% 100%;
  animation: shimmer 7s linear infinite;
}
@keyframes shimmer {
  0%   { background-position: 0% 50%; }
  100% { background-position: 200% 50%; }
}

.hero__sub { color: var(--txt-2); font-size: 14px; }
.hero__sub em { color: #cfcaff; font-style: normal; }

/* 倒计时 */
.countdown {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 9px;
  margin: 22px 0 20px;
}
.countdown__item {
  padding: 11px 4px 9px; text-align: center;
  border-radius: var(--radius-sm);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.03));
  border: 1px solid var(--paper-line);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.14);
}
.countdown__item b {
  display: block; font-size: 21px; font-weight: 800; line-height: 1.1;
  font-variant-numeric: tabular-nums;
  background: var(--grad-text); -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.countdown__item i { font-size: 11px; color: var(--txt-3); font-style: normal; }

/* 数据 */
.stats {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 10px; margin-bottom: 26px;
}
.stats li {
  padding: 12px 8px; text-align: center; border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid var(--paper-line);
}
.stats b {
  display: block; font-size: 19px; font-weight: 800; color: #fff;
  font-variant-numeric: tabular-nums;
}
.stats i { font-size: 11.5px; color: var(--txt-3); font-style: normal; }

/* 按钮 */
.hero__actions { display: flex; flex-wrap: wrap; gap: 10px; }
.btn {
  position: relative; overflow: hidden;
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 22px; border-radius: 99px;
  font-size: 15px; font-weight: 700; letter-spacing: 0.02em;
  transition: transform 0.2s var(--ease), box-shadow 0.25s;
  will-change: transform;
}
.btn:active { transform: scale(0.96); }
.btn svg { width: 18px; height: 18px; }
.btn--primary {
  flex: 1 1 200px;
  color: #0b0a1c;
  background: linear-gradient(100deg, #a99cff, #4fe3c8 55%, #ffb6dd);
  box-shadow: var(--sh-glow);
}
.btn--primary::after { /* 光泽扫过 */
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(100deg, transparent 20%, rgba(255, 255, 255, 0.7), transparent 80%);
  transform: translateX(-120%);
  animation: sheen 3.6s ease-in-out infinite;
}
@keyframes sheen {
  0%, 55% { transform: translateX(-120%); }
  85%,100%{ transform: translateX(120%); }
}
.btn--ghost {
  color: var(--txt-1);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--paper-line);
  backdrop-filter: blur(8px);
}

/* 下滑提示 */
.scroll-hint {
  position: absolute; left: 50%; bottom: calc(var(--safe-b) + 26px);
  transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  color: var(--txt-3); font-size: 12px; letter-spacing: 0.12em;
  animation: hint 2.4s ease-in-out infinite;
}
.scroll-hint svg { width: 22px; height: 22px; }
.scroll-hint.is-hidden { opacity: 0; pointer-events: none; transition: opacity 0.4s; }
@keyframes hint {
  0%, 100% { transform: translate(-50%, 0); opacity: 0.75; }
  50%      { transform: translate(-50%, 9px); opacity: 1; }
}

/* 入场动画 */
.reveal { opacity: 0; transform: translateY(22px); animation: rise 0.95s var(--ease) forwards; animation-delay: var(--d, 0s); }
@keyframes rise { to { opacity: 1; transform: none; } }

/* ---------- 5. 信息流 ---------- */
.feed { position: relative; padding: 54px 0 calc(var(--safe-b) + 110px); }
.feed::before { /* 分隔瀑布 */
  content: ""; position: absolute; top: 0; left: 50%; transform: translateX(-50%);
  width: 120px; height: 2px; border-radius: 2px; background: var(--grad-brand); opacity: 0.7;
}

.feed__head { margin-bottom: 20px; }
.feed__eyebrow {
  font-size: 11.5px; letter-spacing: 0.28em; text-transform: uppercase;
  color: var(--brand-2); font-weight: 700;
}
.feed__title {
  margin: 6px 0 6px; font-size: 27px; font-weight: 900; letter-spacing: -0.01em;
  background: var(--grad-text); -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.feed__desc { color: var(--txt-3); font-size: 13px; }

/* 搜索框 */
.search {
  position: relative;
  display: flex; align-items: center; gap: 8px;
  margin: 16px 0 12px; padding: 4px 6px 4px 14px;
  border-radius: 99px;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid var(--paper-line);
  transition: border-color 0.25s, box-shadow 0.25s, background 0.25s;
}
.search:focus-within {
  border-color: rgba(79, 227, 200, 0.65);
  background: rgba(255, 255, 255, 0.1);
  box-shadow: 0 0 0 4px rgba(79, 227, 200, 0.12);
}
.search__ico {
  width: 18px; height: 18px; flex: 0 0 auto;
  color: var(--txt-3); transition: color 0.25s;
}
.search:focus-within .search__ico { color: var(--brand-2); }
.search__input {
  flex: 1; min-width: 0;
  padding: 9px 0; font-size: 14.5px; color: var(--txt-1);
  background: none; border: 0; outline: none;
  -webkit-appearance: none; appearance: none;
}
.search__input::placeholder { color: var(--txt-3); }
.search__input::-webkit-search-cancel-button { display: none; }
.search__clear {
  width: 24px; height: 24px; border-radius: 50%; flex: 0 0 auto;
  display: grid; place-items: center;
  font-size: 17px; line-height: 1; color: var(--txt-2);
  background: rgba(255, 255, 255, 0.12);
  transition: 0.2s var(--ease);
}
.search__clear:active { transform: scale(0.88); background: rgba(255, 255, 255, 0.22); }
.search__btn {
  flex: 0 0 auto;
  padding: 9px 16px; border-radius: 99px;
  font-size: 13.5px; font-weight: 700; color: #0b0a1c;
  background: linear-gradient(100deg, #a99cff, #4fe3c8);
  transition: transform 0.2s var(--ease);
}
.search__btn:active { transform: scale(0.93); }

/* 排序 + 标签 */
.sorts {
  display: flex; gap: 8px; margin: 12px 0 4px;
  overflow-x: auto; scrollbar-width: none;
}
.sorts::-webkit-scrollbar { display: none; }
.chips--tag { margin-top: 4px; }
.chips--tag .chip { font-size: 12.5px; padding: 6px 13px; }
.chips--tag .chip.is-on {
  background: var(--grad-warm);
  box-shadow: 0 8px 20px -8px rgba(255, 111, 181, 0.85);
}

/* 筛选摘要 */
.filter-summary {
  margin-top: 10px; font-size: 12.5px; color: var(--txt-3);
  display: flex; flex-wrap: wrap; align-items: center; gap: 6px;
}
.filter-summary b { color: #cfcaff; font-weight: 600; }
.filter-summary .reset {
  padding: 4px 12px; border-radius: 99px; font-size: 12px; font-weight: 700;
  color: #0b0a1c; background: linear-gradient(100deg, #a99cff, #4fe3c8);
}
.chips__label {
  flex: 0 0 auto; align-self: center;
  padding: 0 2px; font-size: 13px; font-weight: 800; color: var(--brand-3);
}

/* 搜索命中高亮 */
.card__title mark, .card__excerpt mark {
  padding: 0 2px; border-radius: 3px;
  background: rgba(255, 176, 87, 0.32); color: #ffe1b8;
}

.chips {
  display: flex; gap: 8px; margin: 16px calc(var(--pad) * -1) 4px;
  padding: 2px var(--pad) 6px;
  overflow-x: auto; scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.chips::-webkit-scrollbar { display: none; }
.chip {
  flex: 0 0 auto;
  padding: 7px 15px; border-radius: 99px; font-size: 13px; color: var(--txt-2);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--paper-line);
  transition: 0.25s var(--ease); white-space: nowrap;
}
.chip:active { transform: scale(0.95); }
.chip.is-on {
  color: #0b0a1c; font-weight: 700; border-color: transparent;
  background: linear-gradient(100deg, #a99cff, #4fe3c8);
  box-shadow: 0 8px 20px -8px rgba(108, 92, 231, 0.9);
}

.feed__list { display: flex; flex-direction: column; gap: 16px; }

/* 卡片 */
.card {
  position: relative;
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.075), rgba(255, 255, 255, 0.03));
  border: 1px solid var(--paper-line);
  box-shadow: var(--sh-2);
  overflow: hidden;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transform: translateY(18px); opacity: 0;
  animation: cardIn 0.65s var(--ease) forwards;
  transition: transform 0.3s var(--ease), border-color 0.3s;
}
@keyframes cardIn { to { transform: none; opacity: 1; } }
.card:active { transform: scale(0.985); border-color: rgba(255, 255, 255, 0.26); }

.card__media { position: relative; aspect-ratio: 16 / 9; overflow: hidden; background: var(--ink-700); }
.card__media img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.6s var(--ease);
}
.card__media::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(11, 10, 28, 0.85));
}
.card__cat {
  position: absolute; z-index: 2; left: 12px; top: 12px;
  padding: 5px 11px; border-radius: 99px; font-size: 11.5px; font-weight: 700;
  color: #0b0a1c; background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(6px);
}
.card__time-on-img {
  position: absolute; z-index: 2; right: 12px; bottom: 11px;
  font-size: 11.5px; color: rgba(255, 255, 255, 0.9);
  text-shadow: 0 1px 6px rgba(0, 0, 0, 0.8);
  display: flex; align-items: center; gap: 5px;
}
.card__time-on-img svg { width: 13px; height: 13px; }

.card__body { padding: 0 15px 12px; }
.card__title {
  padding: 12px 0 0;
  font-size: 17.5px; font-weight: 800; line-height: 1.4;
  letter-spacing: -0.005em;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.card__excerpt {
  margin-top: 8px; color: var(--txt-2); font-size: 13.5px; line-height: 1.7;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}
.card__tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.card__tags span {
  font-size: 11.5px; color: #a9e9dc; padding: 3px 9px; border-radius: 99px;
  background: rgba(0, 194, 168, 0.13); border: 1px solid rgba(0, 194, 168, 0.25);
}

.card__foot {
  display: flex; align-items: center; gap: 10px;
  margin-top: 12px; padding-top: 11px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}
.card__author { display: flex; align-items: center; gap: 7px; min-width: 0; flex: 1; }
.card__author img {
  width: 26px; height: 26px; border-radius: 50%; object-fit: cover;
  border: 1px solid rgba(255, 255, 255, 0.25); flex: 0 0 auto;
}
.card__author b { font-size: 12.5px; font-weight: 600; color: var(--txt-2); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.card__acts { display: flex; align-items: center; gap: 4px; flex: 0 0 auto; }
.act {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 6px 9px; border-radius: 99px;
  font-size: 12.5px; color: var(--txt-3);
  font-variant-numeric: tabular-nums;
  transition: 0.22s var(--ease);
}
.act svg { width: 17px; height: 17px; }
.act:active { transform: scale(0.88); background: rgba(255, 255, 255, 0.07); }
.act.is-liked { color: var(--like); }
.act.is-liked svg { fill: var(--like); stroke: var(--like); animation: pop 0.42s var(--ease); }
@keyframes pop {
  0%   { transform: scale(1); }
  45%  { transform: scale(1.42); }
  100% { transform: scale(1); }
}

/* 列表里的热评 */
.card__hot {
  margin: 11px 0 2px; padding: 10px 12px; border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, 0.24);
  border: 1px solid rgba(255, 255, 255, 0.06);
  display: flex; flex-direction: column; gap: 6px;
}
.card__hot li { font-size: 12.5px; color: var(--txt-2); display: flex; gap: 6px; }
.card__hot b { color: #cdc8ff; font-weight: 600; flex: 0 0 auto; }
.card__hot span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* 骨架屏 */
.skeleton {
  border-radius: var(--radius); overflow: hidden;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.03));
  border: 1px solid var(--paper-line);
}
.skeleton__media { aspect-ratio: 16 / 9; }
.skeleton__line { height: 12px; margin: 12px 15px; border-radius: 6px; }
.skeleton__line.is-title { height: 18px; width: 72%; }
.skeleton__line.is-short { width: 45%; margin-bottom: 18px; }
.sk {
  background: linear-gradient(90deg, rgba(255,255,255,0.06) 25%, rgba(255,255,255,0.16) 37%, rgba(255,255,255,0.06) 63%);
  background-size: 400% 100%;
  animation: sk 1.5s ease-in-out infinite;
}
@keyframes sk { 0% { background-position: 100% 0; } 100% { background-position: -100% 0; } }

/* 加载状态 */
.feed__status {
  display: flex; align-items: center; justify-content: center; gap: 10px;
  padding: 22px 0 8px; color: var(--txt-3); font-size: 13px;
}
.feed__status.is-end { color: var(--txt-3); }
.spinner {
  width: 17px; height: 17px; border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.16);
  border-top-color: var(--brand-2);
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.feed__api {
  margin-top: 14px; text-align: center; font-size: 11.5px; color: var(--txt-3);
  word-break: break-all; opacity: 0.8;
}
.feed__api code {
  padding: 2px 6px; border-radius: 6px; background: rgba(255, 255, 255, 0.07);
  font-size: 11px;
}

/* 分类空态 */
.empty { padding: 54px 0; text-align: center; color: var(--txt-3); }
.empty b { display: block; font-size: 40px; margin-bottom: 10px; }

/* 回到顶部 */
.back-top {
  position: fixed; z-index: 40; right: 16px;
  bottom: calc(var(--safe-b) + 88px);
  width: 42px; height: 42px; border-radius: 50%;
  display: grid; place-items: center;
  color: var(--txt-1);
  background: rgba(20, 19, 51, 0.82);
  border: 1px solid var(--paper-line);
  backdrop-filter: blur(10px);
  box-shadow: var(--sh-2);
  opacity: 0; transform: translateY(14px) scale(0.9); pointer-events: none;
  transition: 0.35s var(--ease);
}
.back-top svg { width: 19px; height: 19px; }
.back-top.is-in { opacity: 1; transform: none; pointer-events: auto; }

/* ---------- 6. 右下角「提交投稿」悬浮按钮 ---------- */
.fab {
  position: fixed; z-index: 55;
  right: 14px; bottom: calc(var(--safe-b) + 18px);
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 19px 13px 16px;
  border-radius: 99px;
  font-size: 14.5px; font-weight: 800; letter-spacing: 0.02em;
  color: #0b0a1c;
  background: linear-gradient(100deg, #a99cff, #4fe3c8 58%, #ffb6dd);
  box-shadow: 0 14px 34px -10px rgba(0, 194, 168, 0.75), 0 6px 18px -6px rgba(108, 92, 231, 0.8);
  animation: fabFloat 3.4s ease-in-out infinite;
  transition: transform 0.22s var(--ease), box-shadow 0.25s;
}
.fab svg { width: 19px; height: 19px; stroke-width: 2.2; }
.fab::before { /* 呼吸光环 */
  content: ""; position: absolute; inset: -5px; border-radius: 99px;
  border: 1.5px solid rgba(79, 227, 200, 0.55);
  animation: halo 2.8s ease-out infinite;
}
.fab:active { transform: scale(0.94); box-shadow: 0 8px 20px -8px rgba(0, 194, 168, 0.8); }
@keyframes fabFloat {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-4px); }
}
@keyframes halo {
  0%   { opacity: 0.8; transform: scale(0.96); }
  100% { opacity: 0; transform: scale(1.16); }
}

/* ---------- 7. Toast ---------- */
.toast {
  position: fixed; z-index: 80; left: 50%; bottom: calc(var(--safe-b) + 84px);
  transform: translate(-50%, 16px);
  max-width: 82vw;
  padding: 11px 18px; border-radius: 99px;
  font-size: 13.5px; color: var(--txt-1);
  background: rgba(29, 27, 69, 0.94);
  border: 1px solid var(--paper-line);
  backdrop-filter: blur(12px);
  box-shadow: var(--sh-2);
  opacity: 0; pointer-events: none;
  transition: 0.35s var(--ease);
}
.toast.is-in { opacity: 1; transform: translate(-50%, 0); }

/* ---------- 8. 滚动出现 ---------- */
.reveal-in { opacity: 0; transform: translateY(24px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal-in.is-seen { opacity: 1; transform: none; }

/* ==========================================================================
   9. 内容详情页 detail.html
   ========================================================================== */
body.page-detail { padding-bottom: calc(var(--safe-b) + 96px); }

.detail-top {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  display: flex; align-items: center; gap: 10px;
  padding: calc(var(--safe-t) + 10px) var(--pad) 10px;
  transition: background 0.3s, border-color 0.3s;
  border-bottom: 1px solid transparent;
}
.detail-top.is-solid {
  background: rgba(11, 10, 28, 0.78);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom-color: var(--paper-line);
}
.icon-btn {
  width: 38px; height: 38px; border-radius: 50%;
  display: grid; place-items: center; flex: 0 0 auto;
  color: #fff; background: rgba(11, 10, 28, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(10px);
  transition: 0.22s var(--ease);
}
.icon-btn svg { width: 19px; height: 19px; }
.icon-btn:active { transform: scale(0.9); }
.detail-top__title {
  flex: 1; font-size: 15px; font-weight: 700;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  opacity: 0; transition: opacity 0.3s;
}
.detail-top.is-solid .detail-top__title { opacity: 1; }

.article__hero { position: relative; aspect-ratio: 4 / 3; max-height: 46vh; overflow: hidden; }
.article__hero img { width: 100%; height: 100%; object-fit: cover; }
.article__hero::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(11, 10, 28, 0.55) 0%, transparent 32%, rgba(11, 10, 28, 0.96) 96%);
}

.article { margin-top: -54px; position: relative; z-index: 2; }
.article__cat {
  display: inline-block; margin-bottom: 10px;
  padding: 5px 12px; border-radius: 99px; font-size: 11.5px; font-weight: 700;
  color: #0b0a1c; background: linear-gradient(100deg, #a99cff, #4fe3c8);
}
.article__title {
  font-size: clamp(23px, 6.6vw, 30px); line-height: 1.36; font-weight: 900;
  letter-spacing: -0.01em; text-wrap: balance;
}
.article__meta {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px;
  margin: 14px 0 4px; font-size: 12.5px; color: var(--txt-3);
}
.article__meta span { display: inline-flex; align-items: center; gap: 5px; }
.article__meta svg { width: 14px; height: 14px; }

.article__author {
  display: flex; align-items: center; gap: 11px;
  margin: 16px 0 18px; padding: 12px 14px;
  border-radius: var(--radius); background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--paper-line);
}
.article__author img { width: 42px; height: 42px; border-radius: 50%; object-fit: cover; border: 1.5px solid rgba(255, 255, 255, 0.22); }
.article__author b { display: block; font-size: 14.5px; }
.article__author i { font-size: 12px; color: var(--txt-3); font-style: normal; }
.article__author .follow {
  margin-left: auto; padding: 7px 16px; border-radius: 99px;
  font-size: 12.5px; font-weight: 700; color: #0b0a1c;
  background: linear-gradient(100deg, #a99cff, #4fe3c8);
}
.article__author .follow.is-on { color: var(--txt-2); background: rgba(255, 255, 255, 0.09); }

/* 正文排版 */
.prose { font-size: 16px; line-height: 1.95; color: #e6e4f7; }
.prose > * + * { margin-top: 17px; }
.prose h2 {
  margin-top: 30px; font-size: 19px; font-weight: 800; color: #fff;
  padding-left: 12px; border-left: 3px solid var(--brand-2); line-height: 1.4;
}
.prose p { text-align: justify; }
.prose blockquote {
  margin: 20px 0; padding: 15px 17px;
  border-radius: var(--radius-sm);
  background: linear-gradient(120deg, rgba(108, 92, 231, 0.2), rgba(0, 194, 168, 0.12));
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #ded9ff; font-size: 15px; line-height: 1.8;
}
.prose blockquote::before { content: "“"; font-size: 28px; line-height: 0; color: var(--brand-2); margin-right: 4px; }
.prose ul { display: flex; flex-direction: column; gap: 10px; }
.prose li {
  position: relative; padding-left: 22px; color: var(--txt-2); font-size: 15px;
}
.prose li::before {
  content: ""; position: absolute; left: 4px; top: 11px;
  width: 7px; height: 7px; border-radius: 2px;
  background: var(--grad-brand);
}

/* 书籍信息卡 */
.bookcard {
  display: flex; gap: 13px; align-items: center;
  margin: 24px 0; padding: 14px;
  border-radius: var(--radius);
  background: linear-gradient(120deg, rgba(255, 111, 181, 0.14), rgba(255, 176, 87, 0.1));
  border: 1px solid rgba(255, 255, 255, 0.13);
}
.bookcard__ico { font-size: 30px; }
.bookcard b { display: block; font-size: 15px; }
.bookcard p { font-size: 12px; color: var(--txt-3); margin-top: 3px; }

/* 详情统计条 */
.detail-stats {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 10px; margin: 22px 0;
}
.detail-stats div {
  padding: 12px 8px; text-align: center; border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.05); border: 1px solid var(--paper-line);
}
.detail-stats b { display: block; font-size: 17px; font-variant-numeric: tabular-nums; }
.detail-stats i { font-size: 11.5px; color: var(--txt-3); font-style: normal; }

/* 评论区 */
.comments { margin-top: 30px; }
.comments__head {
  display: flex; align-items: baseline; gap: 8px; margin-bottom: 14px;
}
.comments__head h3 { font-size: 18px; font-weight: 800; }
.comments__head span { font-size: 12.5px; color: var(--txt-3); }
.cmt {
  display: flex; gap: 11px; padding: 13px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  animation: cardIn 0.5s var(--ease) both;
}
.cmt__av {
  width: 36px; height: 36px; border-radius: 50%; flex: 0 0 auto;
  display: grid; place-items: center;
  font-size: 14px; font-weight: 800; color: #0b0a1c;
  background: linear-gradient(140deg, #a99cff, #4fe3c8);
}
.cmt__main { flex: 1; min-width: 0; }
.cmt__top { display: flex; align-items: baseline; gap: 8px; }
.cmt__top b { font-size: 13.5px; }
.cmt__top time { font-size: 11.5px; color: var(--txt-3); }
.cmt__text { margin-top: 5px; font-size: 14px; color: var(--txt-2); line-height: 1.7; }
.cmt__acts { display: flex; gap: 10px; margin-top: 7px; }
.cmt__acts button { font-size: 12px; color: var(--txt-3); display: inline-flex; align-items: center; gap: 4px; }
.cmt__acts svg { width: 14px; height: 14px; }

/* 相关阅读 */
.related { margin-top: 32px; }
.related h3 { font-size: 18px; font-weight: 800; margin-bottom: 12px; }
.related__item {
  display: flex; gap: 12px; align-items: center;
  padding: 10px; border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid var(--paper-line);
  transition: 0.25s var(--ease);
}
.related__item + .related__item { margin-top: 10px; }
.related__item:active { transform: scale(0.98); }
.related__item img { width: 74px; height: 52px; border-radius: 10px; object-fit: cover; flex: 0 0 auto; }
.related__item b {
  font-size: 13.5px; line-height: 1.45; font-weight: 600;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.related__item time { font-size: 11.5px; color: var(--txt-3); display: block; margin-top: 4px; }

/* 详情底部操作条 */
.detail-bar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 55;
  display: flex; align-items: center; gap: 10px;
  padding: 10px var(--pad) calc(var(--safe-b) + 10px);
  background: rgba(11, 10, 28, 0.86);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--paper-line);
}
.detail-bar__input {
  flex: 1; min-width: 0;
  padding: 11px 16px; border-radius: 99px;
  font-size: 13.5px; color: var(--txt-1);
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid var(--paper-line);
  outline: none;
}
.detail-bar__input::placeholder { color: var(--txt-3); }
.detail-bar__input:focus { border-color: rgba(79, 227, 200, 0.6); }
.detail-bar__btn {
  width: 42px; height: 42px; border-radius: 50%;
  display: grid; place-items: center; flex: 0 0 auto;
  color: var(--txt-1); background: rgba(255, 255, 255, 0.07);
  border: 1px solid var(--paper-line);
  transition: 0.22s var(--ease);
}
.detail-bar__btn svg { width: 19px; height: 19px; }
.detail-bar__btn.is-liked { color: var(--like); }
.detail-bar__btn.is-liked svg { fill: var(--like); stroke: var(--like); }
.detail-bar__btn.is-star { color: var(--brand-4); }
.detail-bar__btn.is-star svg { fill: var(--brand-4); stroke: var(--brand-4); }
.detail-bar__send {
  padding: 11px 18px; border-radius: 99px; font-size: 13.5px; font-weight: 700;
  color: #0b0a1c; background: linear-gradient(100deg, #a99cff, #4fe3c8);
  flex: 0 0 auto;
}
.detail-bar__send:active { transform: scale(0.94); }

/* 详情加载骨架 */
.detail-skeleton { padding: 90px 0 0; }

/* ---------- 10. 响应式 ---------- */
@media (min-width: 480px) {
  :root { --pad: 22px; }
  .card__title { font-size: 18.5px; }
}

@media (min-width: 700px) {
  body { font-size: 16px; }
  .hero__title { font-size: 58px; }
  .fab { right: max(24px, calc(50vw - 320px + 16px)); }
  .back-top { right: max(26px, calc(50vw - 320px + 18px)); }
  .feed__list { gap: 20px; }
}

/* 大屏也保持手机版式（本页面仅适配移动端访问） */
@media (min-width: 900px) {
  .shell { max-width: 620px; }
  .hero__inner { max-width: 620px; }
}

/* 降低动效偏好 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
  html { scroll-behavior: auto; }
  .reveal, .reveal-in { opacity: 1 !important; transform: none !important; }
}