/* ============================================================
   书斋 · TXT 小说阅读器 — 界面样式
   设计语言：克制、留白、毛玻璃材质、系统字体、真实动效
   （参考 Apple 设计原则，融合网文阅读 App 的书架/阅读习惯）
   布局策略：移动端 = 底部标签栏；桌面端 = 左侧导航栏
   ============================================================ */

/* ------------------------------------------------------------
   1. 设计令牌
   ------------------------------------------------------------ */
:root {
  /* 浅色 */
  --bg: #f4f5f7;
  --bg-deep: #e9ebef;
  --surface: rgba(255, 255, 255, 0.72);
  --surface-strong: rgba(255, 255, 255, 0.88);
  --surface-solid: #ffffff;
  --text: #1c1f26;
  --text-secondary: #5c6370;
  --text-tertiary: #9aa0ac;
  --accent: #0071e3;
  --accent-press: #0060c0;
  --accent-soft: rgba(0, 113, 227, 0.1);
  --danger: #ff3b30;
  --success: #34c759;
  --border: rgba(24, 36, 58, 0.09);

  --shadow-sm: 0 1px 2px rgba(24, 36, 58, 0.05), 0 6px 20px rgba(24, 36, 58, 0.06);
  --shadow-md: 0 2px 4px rgba(24, 36, 58, 0.06), 0 16px 40px rgba(24, 36, 58, 0.12);
  --shadow-lg: 0 6px 12px rgba(24, 36, 58, 0.08), 0 28px 80px rgba(24, 36, 58, 0.18);

  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --navbar-h: 60px;

  --spring: cubic-bezier(0.22, 1, 0.36, 1);
  --ease: cubic-bezier(0.23, 1, 0.32, 1);

  color-scheme: light;
}

[data-theme='sepia'] {
  --bg: #f3ead8;
  --bg-deep: #e8dcc4;
  --surface: rgba(250, 244, 233, 0.8);
  --surface-strong: rgba(250, 244, 233, 0.92);
  --surface-solid: #faf4e9;
  --text: #433422;
  --text-secondary: #77644d;
  --text-tertiary: #a89479;
  --accent: #a9713c;
  --accent-press: #8a5a2e;
  --accent-soft: rgba(169, 113, 60, 0.12);
  --border: rgba(91, 65, 36, 0.12);
  color-scheme: light;
}

[data-theme='dark'] {
  --bg: #0c0d10;
  --bg-deep: #131519;
  --surface: rgba(30, 32, 38, 0.72);
  --surface-strong: rgba(30, 32, 38, 0.9);
  --surface-solid: #1e2026;
  --text: #f4f6fa;
  --text-secondary: #aab3c0;
  --text-tertiary: #6f7886;
  --accent: #0a84ff;
  --accent-press: #3395ff;
  --accent-soft: rgba(10, 132, 255, 0.16);
  --danger: #ff453a;
  --success: #32d74b;
  --border: rgba(255, 255, 255, 0.1);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4), 0 6px 20px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.5), 0 16px 40px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 6px 12px rgba(0, 0, 0, 0.55), 0 28px 80px rgba(0, 0, 0, 0.6);
  color-scheme: dark;
}

/* ------------------------------------------------------------
   2. 重置与基础
   ------------------------------------------------------------ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  background: var(--bg);
}

html [hidden] {
  display: none !important;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro SC', 'PingFang SC',
    'Hiragino Sans GB', 'Microsoft YaHei', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.5;
  min-height: 100dvh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.35s var(--ease), color 0.35s var(--ease);
}

button {
  font-family: inherit;
  border: none;
  background: none;
  color: inherit;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

input,
textarea {
  font-family: inherit;
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible,
input:focus-visible,
textarea:focus-visible,
.drop-zone:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 30%, transparent);
  outline-offset: 2px;
}

::selection {
  background: color-mix(in srgb, var(--accent) 24%, transparent);
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-thumb {
  background: color-mix(in srgb, var(--text-tertiary) 50%, transparent);
  border-radius: 99px;
  border: 2px solid transparent;
  background-clip: content-box;
}
::-webkit-scrollbar-thumb:hover {
  background-color: color-mix(in srgb, var(--text-secondary) 55%, transparent);
}

/* ------------------------------------------------------------
   3. 通用组件
   ------------------------------------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 42px;
  padding: 8px 18px;
  border-radius: 980px;
  font-size: 15px;
  font-weight: 600;
  transition: transform 0.15s var(--ease), background-color 0.2s var(--ease),
    box-shadow 0.2s var(--ease), opacity 0.2s var(--ease);
}

.btn:active {
  transform: scale(0.96);
}

.btn--primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 6px 16px color-mix(in srgb, var(--accent) 30%, transparent);
}

.btn--primary:hover {
  background: var(--accent-press);
}

.btn--block {
  width: 100%;
  min-height: 50px;
  font-size: 15px;
}

.btn--danger {
  background: color-mix(in srgb, var(--danger) 12%, transparent);
  color: var(--danger);
}

.btn--danger:hover {
  background: color-mix(in srgb, var(--danger) 18%, transparent);
}

/* 图标按钮 */
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 12px;
  color: var(--text-secondary);
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease),
    transform 0.12s var(--ease);
}

.icon-btn:hover {
  background: color-mix(in srgb, var(--text-secondary) 12%, transparent);
  color: var(--text);
}

.icon-btn:active {
  transform: scale(0.92);
}

/* 表单字段 */
.field {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.field__label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
}

.field__input {
  font-size: 16px;
  padding: 13px 15px;
  min-height: 50px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface-solid) 70%, transparent);
  color: var(--text);
  outline: none;
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease), background-color 0.2s var(--ease);
}

.field__input:hover {
  border-color: color-mix(in srgb, var(--accent) 26%, var(--border));
}

.field__input:focus {
  border-color: color-mix(in srgb, var(--accent) 70%, transparent);
  background: var(--surface-solid);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 14%, transparent);
}

.field__input::placeholder {
  color: var(--text-tertiary);
}

.field__textarea {
  resize: none;
  min-height: 120px;
  line-height: 1.6;
}

/* 头像 */
.avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 17px;
  font-weight: 700;
  flex-shrink: 0;
  user-select: none;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.3), 0 5px 12px rgba(24, 36, 58, 0.12);
}

.avatar--sm {
  width: 30px;
  height: 30px;
  font-size: 13px;
}

/* Toast */
.toast {
  position: fixed;
  left: 50%;
  bottom: calc(84px + env(safe-area-inset-bottom));
  transform: translateX(-50%) translateY(12px);
  z-index: 100;
  max-width: min(90vw, 380px);
  padding: 11px 18px;
  border-radius: 980px;
  background: var(--surface-solid);
  color: var(--text);
  font-size: 14px;
  font-weight: 500;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
  opacity: 0;
  transition: opacity 0.3s var(--ease), transform 0.35s var(--spring);
  pointer-events: none;
}

.toast.is-show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* 空状态 */
.empty-state {
  text-align: center;
  padding: 48px 0 20px;
}

.empty-state__art {
  display: grid;
  width: 60px;
  height: 60px;
  place-items: center;
  margin: 0 auto 17px;
  color: var(--accent);
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--accent-soft);
}

.empty-state__art svg {
  display: block;
}

.empty-state__title {
  font-size: 18px;
  font-weight: 650;
}

.empty-state__sub {
  margin-top: 6px;
  font-size: 14px;
  color: var(--text-tertiary);
}

/* ------------------------------------------------------------
   4. 布局骨架
   ------------------------------------------------------------ */
.view {
  min-height: 100dvh;
}

.view--page {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
  padding-bottom: calc(84px + env(safe-area-inset-bottom));
}

/* 顶部导航栏 */
.navbar {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  height: var(--navbar-h);
  padding: 0 max(20px, env(safe-area-inset-left)) 0 max(20px, env(safe-area-inset-right));
  background: var(--surface);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
}

.navbar__title {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.navbar__title--flex {
  flex: 1;
  min-width: 0;
  text-align: left;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* 页面主体 */
.page-main {
  flex: 1;
  max-width: 820px;
  width: 100%;
  margin: 0 auto;
  padding: 24px 20px 40px;
}

.page-desc {
  max-width: 620px;
  margin-bottom: 20px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-tertiary);
}

/* 搜索栏 */
.search-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 48px;
  padding: 10px 15px;
  border-radius: 15px;
  background: color-mix(in srgb, var(--surface-solid) 60%, transparent);
  border: 1px solid var(--border);
  margin-bottom: 18px;
  color: var(--text-tertiary);
  box-shadow: var(--shadow-sm);
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.search-bar:focus-within {
  border-color: color-mix(in srgb, var(--accent) 55%, transparent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 12%, transparent), var(--shadow-sm);
}

.search-bar input {
  flex: 1;
  border: none;
  background: none;
  outline: none;
  font-size: 15px;
  color: var(--text);
}

.search-bar input::placeholder {
  color: var(--text-tertiary);
}

/* ------------------------------------------------------------
   5. 底部导航（移动端）
   ------------------------------------------------------------ */
.tabbar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 45;
  display: flex;
  background: var(--surface-strong);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border-top: 1px solid var(--border);
  padding: 7px 8px calc(7px + env(safe-area-inset-bottom));
}

.tabbar__brand,
.tabbar__foot {
  display: none;
}

.tabbar__item {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 6px 0;
  border-radius: 13px;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-tertiary);
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease), transform 0.14s var(--ease);
}

.tabbar__item svg {
  transition: transform 0.25s var(--spring);
}

.tabbar__item.is-active {
  color: var(--accent);
  background: var(--accent-soft);
}

.tabbar__item:active {
  transform: scale(0.96);
}

/* ------------------------------------------------------------
   6. 登录视图
   ------------------------------------------------------------ */
.view--login {
  position: relative;
  isolation: isolate;
  display: grid;
  place-items: center;
  padding: max(28px, env(safe-area-inset-top)) max(20px, env(safe-area-inset-right)) max(28px, env(safe-area-inset-bottom)) max(20px, env(safe-area-inset-left));
  background:
    radial-gradient(900px 520px at 12% -8%, color-mix(in srgb, var(--accent) 12%, transparent), transparent 70%),
    radial-gradient(720px 440px at 96% 4%, color-mix(in srgb, #8b9fff 12%, transparent), transparent 72%),
    linear-gradient(145deg, var(--bg), var(--bg-deep));
}

.login-card {
  position: relative;
  width: min(448px, 100%);
  padding: clamp(28px, 5vw, 40px);
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  background: var(--surface-solid);
  box-shadow: var(--shadow-lg);
  animation: rise-in 0.5s var(--spring) both;
}

.login-card__topline {
  display: flex;
  align-items: center;
  gap: 12px;
}

.login-logo {
  display: grid;
  width: 52px;
  height: 52px;
  place-items: center;
  color: #fff;
  border-radius: 17px;
  background: linear-gradient(145deg, #63b5ff, #1477ed 64%, #3956ce);
  box-shadow: 0 10px 22px color-mix(in srgb, var(--accent) 28%, transparent), inset 0 1px 0 rgba(255, 255, 255, 0.42);
}

.login-kicker {
  margin-left: auto;
  color: var(--text-tertiary);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.16em;
}

.login-title {
  margin-top: 26px;
  font-size: clamp(34px, 7vw, 44px);
  font-weight: 750;
  letter-spacing: -0.05em;
  line-height: 1;
}

.login-sub {
  max-width: 300px;
  margin: 13px 0 28px;
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.65;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.login-error {
  font-size: 13px;
  color: var(--danger);
  text-align: center;
}

.login-switch {
  text-align: center;
  font-size: 13px;
  color: var(--text-tertiary);
}

.login-switch__btn {
  color: var(--accent);
  font-weight: 600;
  font-size: 13px;
  padding: 4px;
}

.login-footnote {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  margin-top: 24px;
  color: var(--text-tertiary);
  font-size: 11px;
}

.login-footnote span {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--success) 12%, transparent);
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(16px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ------------------------------------------------------------
   7. 书库
   ------------------------------------------------------------ */
.library {
  max-width: 1100px;
  margin: 0 auto;
  padding: clamp(40px, 6vw, 72px) 24px 120px;
}

.hero {
  max-width: 680px;
  margin-bottom: 30px;
}

.hero__intro {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 16px;
}

.hero__mark {
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  color: var(--accent);
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--accent-soft);
}

.hero__eyebrow {
  margin: 0;
  color: var(--text-tertiary);
  font-size: 11px;
  font-weight: 750;
  letter-spacing: 0.16em;
}

.hero__title {
  max-width: 640px;
  margin-bottom: 14px;
  font-size: clamp(34px, 6vw, 58px);
  font-weight: 750;
  letter-spacing: -0.05em;
  line-height: 1.04;
}

.hero__subtitle {
  max-width: 530px;
  color: var(--text-secondary);
  font-size: 16px;
  line-height: 1.7;
}

/* 上传区 */
.drop-zone {
  position: relative;
  max-width: 100%;
  min-height: 200px;
  padding: 36px 28px;
  text-align: center;
  cursor: pointer;
  overflow: hidden;
  border: 1.5px dashed color-mix(in srgb, var(--accent) 30%, var(--text-tertiary));
  border-radius: 24px;
  background: var(--surface);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  box-shadow: var(--shadow-sm);
  transition: border-color 0.25s var(--ease), transform 0.2s var(--ease), box-shadow 0.3s var(--ease);
}

.drop-zone:hover {
  border-color: color-mix(in srgb, var(--accent) 70%, transparent);
  box-shadow: var(--shadow-md);
}

.drop-zone.is-dragover {
  border-style: solid;
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, var(--surface-solid));
  transform: scale(1.004);
  box-shadow: 0 0 0 5px color-mix(in srgb, var(--accent) 10%, transparent), var(--shadow-md);
}

.drop-zone__icon {
  width: 58px;
  height: 58px;
  margin: 0 auto 18px;
  display: grid;
  place-items: center;
  border-radius: 18px;
  color: var(--accent);
  background: var(--accent-soft);
  transition: transform 0.3s var(--spring);
}

.drop-zone:hover .drop-zone__icon {
  transform: translateY(-3px);
}

.drop-zone__main {
  font-size: 16px;
  font-weight: 600;
}

.drop-zone__link {
  color: var(--accent);
}

.drop-zone__hint {
  margin-top: 9px;
  color: var(--text-tertiary);
  font-size: 12px;
}

.upload-progress {
  max-width: 340px;
  margin: 20px auto 0;
}

.upload-progress__track {
  height: 6px;
  border-radius: 99px;
  background: color-mix(in srgb, var(--text-tertiary) 20%, transparent);
  overflow: hidden;
}

.upload-progress__bar {
  height: 100%;
  width: 0%;
  border-radius: 99px;
  background: var(--accent);
  transition: width 0.3s var(--ease);
}

.upload-progress__label {
  margin-top: 10px;
  font-size: 13px;
  color: var(--text-secondary);
}

/* 书架 */
.shelf-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 44px 0 18px;
}

.shelf-head__title {
  font-size: 23px;
  font-weight: 750;
  letter-spacing: -0.03em;
}

.shelf-head__count {
  font-size: 13px;
  color: var(--text-tertiary);
  font-variant-numeric: tabular-nums;
}

.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 24px 18px;
}

/* 书卡 */
.book-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 11px;
  animation: rise-in 0.5s var(--spring) both;
}

.book-card__cover {
  position: relative;
  aspect-ratio: 3 / 4;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 12px 26px rgba(24, 36, 58, 0.16), inset 0 1px 0 rgba(255, 255, 255, 0.22);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 18px;
  cursor: pointer;
  transition: transform 0.35s var(--spring), box-shadow 0.35s var(--ease);
}

.book-card:hover .book-card__cover {
  transform: translateY(-4px) scale(1.01);
  box-shadow: var(--shadow-lg);
}

.book-card__cover::before {
  content: '';
  position: absolute;
  inset: 9px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 11px;
  opacity: 0.7;
}

.book-card__cover::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.24), transparent 42%),
    linear-gradient(0deg, rgba(0, 0, 0, 0.13), transparent 54%);
  pointer-events: none;
}

.book-card__cover-title {
  position: relative;
  z-index: 1;
  max-width: 88%;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.35;
  color: rgba(255, 255, 255, 0.96);
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.2);
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-align: center;
  word-break: break-all;
}

.book-card__meta {
  padding: 0 2px;
}

.book-card__name {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.book-card__info {
  margin-top: 4px;
  font-size: 12px;
  color: var(--text-tertiary);
  font-variant-numeric: tabular-nums;
}

.book-card__progress {
  height: 4px;
  margin-top: 8px;
  border-radius: 99px;
  background: color-mix(in srgb, var(--text-tertiary) 16%, transparent);
  overflow: hidden;
}

.book-card__progress i {
  display: block;
  height: 100%;
  border-radius: 99px;
  background: var(--accent);
  transition: width 0.4s var(--ease);
}

.book-card__remove {
  position: absolute;
  top: 9px;
  right: 9px;
  z-index: 2;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: rgba(0, 0, 0, 0.42);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.22);
  opacity: 0;
  transform: scale(0.8);
  transition: opacity 0.2s var(--ease), transform 0.25s var(--spring), background-color 0.2s var(--ease);
}

.book-card:hover .book-card__remove,
.book-card:focus-within .book-card__remove {
  opacity: 1;
  transform: none;
}

.book-card__remove:hover {
  background: var(--danger);
}

/* ------------------------------------------------------------
   9. 抽屉（发帖）
   ------------------------------------------------------------ */
.sheet-backdrop {
  position: fixed;
  inset: 0;
  z-index: 50;
  background: rgba(12, 20, 32, 0.34);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  opacity: 0;
  transition: opacity 0.3s var(--ease);
}

.sheet-backdrop.is-show {
  opacity: 1;
}

.sheet {
  position: fixed;
  top: 0;
  bottom: 0;
  z-index: 60;
  width: min(340px, 88vw);
  display: flex;
  flex-direction: column;
  background: color-mix(in srgb, var(--surface-solid) 88%, transparent);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
  backdrop-filter: blur(30px) saturate(125%);
  -webkit-backdrop-filter: blur(30px) saturate(125%);
  transition: transform 0.45s var(--spring);
}

.sheet--right {
  right: 0;
  border-right: none;
  border-radius: var(--radius-lg) 0 0 var(--radius-lg);
  transform: translateX(105%);
}

.sheet--right.is-open {
  transform: translateX(0);
}

.sheet__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 18px 12px;
}

.sheet__title {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

/* 发帖抽屉 */
.compose {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 4px 20px 28px;
  overflow-y: auto;
}

.compose__board {
  font-size: 13px;
  color: var(--text-secondary);
  padding: 8px 12px;
  border-radius: 10px;
  background: var(--accent-soft);
}

/* ------------------------------------------------------------
   10. 推荐 / 书友 / 论坛 / 我的（社交页）
   ------------------------------------------------------------ */
.card-surface {
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface-solid) 62%, transparent);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
}

/* 推荐 */
.recommend-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.recommend-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px;
  border-radius: 18px;
  cursor: pointer;
  transition: transform 0.25s var(--spring), box-shadow 0.3s var(--ease);
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface-solid) 62%, transparent);
  box-shadow: var(--shadow-sm);
}

.recommend-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.recommend-card__cover {
  width: 58px;
  height: 78px;
  border-radius: 11px;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  padding: 8px;
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  text-align: center;
  overflow: hidden;
  box-shadow: 0 8px 16px rgba(24, 36, 58, 0.15);
}

.recommend-card__body {
  flex: 1;
  min-width: 0;
}

.recommend-card__title {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.recommend-card__meta {
  margin-top: 4px;
  font-size: 12.5px;
  color: var(--text-tertiary);
}

.recommend-card__actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.heart-btn {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  color: var(--text-tertiary);
  transition: color 0.2s var(--ease), transform 0.25s var(--spring), background-color 0.2s var(--ease);
}

.heart-btn:hover {
  color: var(--accent);
  background: var(--accent-soft);
}

.heart-btn.is-liked {
  color: var(--danger);
}

.heart-btn.is-liked svg {
  fill: currentColor;
}

.heart-btn:active {
  transform: scale(0.82);
}

.heart-count {
  font-size: 11px;
  color: var(--text-tertiary);
  font-variant-numeric: tabular-nums;
}

/* 书友 */
.friend-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.friend-card {
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 76px;
  padding: 14px;
  border-radius: 18px;
  cursor: pointer;
  transition: transform 0.2s var(--spring), box-shadow 0.25s var(--ease);
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface-solid) 62%, transparent);
  box-shadow: var(--shadow-sm);
}

.friend-card:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.friend-card__body {
  flex: 1;
  min-width: 0;
}

.friend-card__name {
  font-size: 15px;
  font-weight: 600;
}

.friend-card__name span {
  color: var(--text-tertiary);
  font-weight: 400;
  font-size: 13px;
  margin-left: 6px;
}

.friend-card__meta {
  margin-top: 3px;
  font-size: 12.5px;
  color: var(--text-tertiary);
}

.follow-btn {
  padding: 7px 18px;
  min-height: 36px;
  border-radius: 980px;
  font-size: 13px;
  font-weight: 600;
  background: var(--accent);
  color: #fff;
  box-shadow: 0 5px 12px color-mix(in srgb, var(--accent) 16%, transparent);
  transition: background-color 0.2s var(--ease), transform 0.15s var(--ease), opacity 0.2s var(--ease);
}

.follow-btn:active {
  transform: scale(0.95);
}

.follow-btn.is-following {
  background: color-mix(in srgb, var(--text-secondary) 12%, transparent);
  color: var(--text-secondary);
  box-shadow: none;
}

/* 用户主页（弹层） */
.profile-backdrop {
  position: fixed;
  inset: 0;
  z-index: 55;
  background: color-mix(in srgb, var(--surface-solid) 94%, transparent);
  backdrop-filter: blur(22px);
  -webkit-backdrop-filter: blur(22px);
  overflow-y: auto;
  padding: 0 0 48px;
  opacity: 0;
  transition: opacity 0.3s var(--ease);
}

.profile-backdrop.is-show {
  opacity: 1;
}

.profile-head {
  padding: max(56px, env(safe-area-inset-top)) 24px 24px;
  text-align: center;
  background: radial-gradient(460px 220px at 50% 0, var(--accent-soft), transparent 74%);
}

.profile-head .avatar {
  width: 72px;
  height: 72px;
  font-size: 28px;
  margin: 0 auto;
}

.profile-head__name {
  margin-top: 12px;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.profile-head__user {
  margin-top: 3px;
  font-size: 13px;
  color: var(--text-tertiary);
}

.profile-head__stats {
  margin-top: 14px;
  display: flex;
  justify-content: center;
  gap: 28px;
}

.profile-head__stat {
  text-align: center;
}

.profile-head__stat b {
  font-size: 17px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.profile-head__stat span {
  display: block;
  font-size: 11px;
  color: var(--text-tertiary);
}

.profile-head__follow {
  margin-top: 16px;
}

.profile-section {
  max-width: 720px;
  margin: 24px auto 0;
  padding: 0 20px;
}

.profile-section__title {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 14px;
}

/* 论坛 */
.board-card {
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 76px;
  padding: 16px;
  border-radius: 18px;
  margin-bottom: 12px;
  cursor: pointer;
  transition: transform 0.2s var(--spring), box-shadow 0.25s var(--ease);
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface-solid) 62%, transparent);
  box-shadow: var(--shadow-sm);
}

.board-card:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.board-card__icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  font-size: 22px;
  background: var(--accent-soft);
  flex-shrink: 0;
}

.board-card__body {
  flex: 1;
  min-width: 0;
}

.board-card__title {
  font-size: 16px;
  font-weight: 600;
}

.board-card__meta {
  margin-top: 3px;
  font-size: 12.5px;
  color: var(--text-tertiary);
}

.board-card__arrow {
  color: var(--text-tertiary);
}

/* 帖子列表 */
.post-card {
  padding: 16px 4px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background-color 0.15s var(--ease);
}

.post-card:hover {
  background: var(--accent-soft);
}

.post-card:first-child {
  border-top: 1px solid var(--border);
}

.post-card__title {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.4;
}

.post-card__excerpt {
  margin-top: 5px;
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-card__meta {
  margin-top: 9px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12.5px;
  color: var(--text-tertiary);
}

.post-card__author {
  display: flex;
  align-items: center;
  gap: 7px;
}

/* 帖子详情 */
.post-detail {
  padding: 4px 0;
}

.post-detail__title {
  font-size: 21px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.4;
}

.post-detail__head {
  margin-top: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
}

.post-detail__author-name {
  font-size: 14px;
  font-weight: 600;
}

.post-detail__time {
  font-size: 12px;
  color: var(--text-tertiary);
}

.post-detail__content {
  margin-top: 18px;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--text);
  white-space: pre-wrap;
  word-break: break-word;
}

.comment-list {
  margin-top: 24px;
}

.comment-list__title {
  font-size: 15px;
  font-weight: 700;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 4px;
}

.comment-item {
  display: flex;
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}

.comment-item__body {
  flex: 1;
  min-width: 0;
}

.comment-item__meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
}

.comment-item__name {
  font-weight: 600;
}

.comment-item__time {
  color: var(--text-tertiary);
  font-size: 12px;
}

.comment-item__content {
  margin-top: 6px;
  font-size: 14.5px;
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-word;
}

.comment-form {
  margin-top: 18px;
}

/* ------------------------------------------------------------
   11. 我的
   ------------------------------------------------------------ */
.me-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 22px;
  border-radius: 22px;
  margin-bottom: 24px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface-solid) 62%, transparent);
  box-shadow: var(--shadow-sm);
}

.me-card__body {
  flex: 1;
}

.me-card__name {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.me-card__user {
  margin-top: 3px;
  font-size: 13px;
  color: var(--text-tertiary);
}

.me-card__stats {
  display: flex;
  gap: 18px;
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--text-secondary);
}

.me-card__stats b {
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.me-card__hint {
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--text-tertiary);
}

.me-section {
  margin-bottom: 26px;
}

.me-section__title {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.session-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.session-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 12px;
  font-size: 13.5px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface-solid) 62%, transparent);
}

.session-item__body {
  flex: 1;
  min-width: 0;
}

.session-item__time {
  font-size: 12px;
  color: var(--text-tertiary);
}

.session-item__current {
  font-size: 11px;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 2px 8px;
  border-radius: 99px;
}

.me-following {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.me-following__empty {
  font-size: 13px;
  color: var(--text-tertiary);
  padding: 8px 0;
}

/* ------------------------------------------------------------
   12. 响应式 — 悬浮 Dock（平板）
   ------------------------------------------------------------ */
@media (min-width: 860px) {
  .tabbar {
    right: auto;
    bottom: 20px;
    left: 50%;
    width: min(560px, calc(100% - 48px));
    padding: 8px;
    border: 1px solid var(--border);
    border-radius: 24px;
    transform: translateX(-50%);
    box-shadow: var(--shadow-md);
  }

  .tabbar__item {
    min-height: 48px;
  }

  .view--page {
    padding-bottom: 116px;
  }
}

/* ------------------------------------------------------------
   13. 响应式 — 桌面端（左侧导航栏）
   ------------------------------------------------------------ */
@media (min-width: 1024px) {
  .view--library,
  .view--page {
    margin-left: 236px;
  }

  .view--page {
    padding-bottom: 56px;
  }

  /* 底部导航 → 左侧导航栏 */
  .tabbar {
    top: 0;
    right: auto;
    bottom: 0;
    left: 0;
    width: 236px;
    height: 100dvh;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 8px;
    padding: max(28px, env(safe-area-inset-top)) 14px max(22px, env(safe-area-inset-bottom));
    overflow: hidden;
    border-top: none;
    border-right: 1px solid var(--border);
    border-bottom: none;
    border-radius: 0;
    background: var(--surface-strong);
    box-shadow: 14px 0 40px rgba(24, 36, 58, 0.05);
    transform: none;
  }

  .tabbar__brand {
    display: flex;
    align-items: center;
    gap: 11px;
    padding: 0 14px;
    margin: 0 0 34px;
  }

  .tabbar__brand-mark {
    display: grid;
    width: 36px;
    height: 36px;
    place-items: center;
    color: #fff;
    border-radius: 11px;
    background: linear-gradient(145deg, #63b5ff, #1477ed 64%, #3956ce);
    box-shadow: 0 8px 18px color-mix(in srgb, var(--accent) 24%, transparent);
  }

  .tabbar__brand-text {
    font-size: 22px;
    font-weight: 750;
    letter-spacing: -0.05em;
    line-height: 1;
  }

  .tabbar__foot {
    display: block;
    margin-top: auto;
    padding: 20px 14px 0;
    color: var(--text-tertiary);
    border-top: 1px solid var(--border);
    font-size: 9px;
    font-weight: 750;
    letter-spacing: 0.15em;
  }

  .tabbar__item {
    flex: none;
    flex-direction: row;
    justify-content: flex-start;
    gap: 13px;
    min-height: 50px;
    padding: 0 14px;
    border-radius: 15px;
    font-size: 14px;
    font-weight: 600;
    text-align: left;
  }

  .tabbar__item svg {
    width: 21px;
    height: 21px;
  }

  .tabbar__item.is-active {
    background: linear-gradient(100deg, var(--accent-soft), transparent);
  }

  .navbar {
    padding: 0 38px;
  }

  /* 书库：左文案右上传，下方书架 */
  .library {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(320px, 380px);
    column-gap: clamp(40px, 6vw, 96px);
    max-width: 1260px;
    padding: clamp(64px, 7vw, 96px) clamp(40px, 5vw, 84px) 92px;
  }

  .library > .hero {
    grid-column: 1;
    align-self: center;
    max-width: 620px;
    margin: 0;
    padding-bottom: 8px;
  }

  .library > .drop-zone {
    grid-column: 2;
    align-self: stretch;
    min-height: 278px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 36px 26px;
    border-radius: 26px;
  }

  .library > .shelf-head,
  .library > .book-grid,
  .library > .empty-state {
    grid-column: 1 / -1;
  }

  .library > .shelf-head {
    margin-top: 72px;
  }

  .book-grid {
    grid-template-columns: repeat(auto-fill, minmax(178px, 1fr));
    gap: 34px 26px;
  }

  .page-main {
    max-width: 980px;
    padding: 42px 44px 56px;
  }

  .recommend-list,
  .friend-list,
  #forum-content,
  .me-section,
  .me-card {
    max-width: 860px;
  }

  .recommend-card,
  .friend-card,
  .board-card {
    padding: 16px 18px;
  }
}

/* ------------------------------------------------------------
   14. 小屏适配
   ------------------------------------------------------------ */
@media (max-width: 640px) {
  .navbar {
    padding: 0 max(18px, env(safe-area-inset-left)) 0 max(18px, env(safe-area-inset-right));
  }

  .library {
    padding: 40px 18px 116px;
  }

  .hero__title {
    max-width: 330px;
    font-size: clamp(34px, 10vw, 48px);
  }

  .hero__subtitle {
    font-size: 15px;
  }

  .drop-zone {
    min-height: 184px;
    padding: 30px 18px;
  }

  .book-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 14px;
  }

  .book-card__cover-title {
    font-size: 15px;
  }

  .page-main {
    padding: 20px 18px 40px;
  }

  .recommend-card,
  .friend-card,
  .board-card {
    padding: 12px;
  }

  .login-card {
    padding: 26px 22px 22px;
  }
}

@media (max-width: 380px) {
  .login-card__topline {
    align-items: flex-start;
    flex-direction: column;
  }

  .login-kicker {
    margin-left: 0;
  }
}

/* ------------------------------------------------------------
   15. 触控 / 无障碍
   ------------------------------------------------------------ */
@media (hover: hover) and (pointer: fine) {
  .btn--primary:hover,
  .follow-btn:hover {
    transform: translateY(-1px);
  }

  .icon-btn:hover {
    transform: translateY(-1px);
  }
}

@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;
  }

  .book-card:hover .book-card__cover,
  .drop-zone.is-dragover {
    transform: none !important;
  }
}

@media (prefers-reduced-transparency: reduce) {
  .navbar,
  .drop-zone,
  .tabbar,
  .recommend-card,
  .friend-card,
  .board-card,
  .me-card,
  .session-item,
  .sheet,
  .login-card,
  .profile-backdrop {
    background: var(--surface-solid);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
}