:root {
  --primary: #6c5ce7;
  --primary-light: #a29bfe;
  --primary-dark: #4834d4;
  --accent: #fd79a8;
  --bg: #dde0ea;
  --card-bg: #ffffff;
  --text: #2d3436;
  --text-muted: #636e72;
  --border: #e0e0f0;
  --shadow: 0 4px 20px rgba(108,92,231,0.10);
  --shadow-hover: 0 8px 30px rgba(108,92,231,0.18);
  --radius: 14px;
  --radius-sm: 8px;
  --nav-h: 64px;
  --transition: all 0.25s cubic-bezier(.4,0,.2,1);
}
/* 深色主题 */
[data-theme="dark"] {
  --bg: #242440;
  --card-bg: #1c1c34;
  --text: #e0e0f0;
  --text-muted: #a0a0b8;
  --border: #333355;
  --shadow: 0 4px 20px rgba(0,0,0,0.25);
  --shadow-hover: 0 8px 30px rgba(0,0,0,0.35);
}
[data-theme="dark"] .navbar { background: rgba(28,28,52,0.95); border-bottom-color: var(--border); }
[data-theme="dark"] .btn-primary { background: var(--primary); }
[data-theme="dark"] .btn-ghost { background: rgba(108,92,231,0.15); }
[data-theme="dark"] .btn-outline { border-color: var(--primary-light); color: var(--primary-light); }
[data-theme="dark"] .cat-tag-item { background: var(--card-bg); border-color: var(--border); color: var(--text-muted); }
[data-theme="dark"] .cat-tab { background: #2a2a3e; color: #ccc; border-color: #3a3a5e; }
[data-theme="dark"] .cat-tab:hover { border-color: var(--primary); color: #fff; }
[data-theme="dark"] .cat-tab.active { background: var(--primary); color: #fff; border-color: var(--primary); }
[data-theme="dark"] .search-bar { background: var(--card-bg); border-color: var(--border); }
[data-theme="dark"] .search-bar input { color: var(--text); }
[data-theme="dark"] input, [data-theme="dark"] textarea, [data-theme="dark"] select { background: #2a2a48; color: var(--text); border-color: #3a3a5e; }
[data-theme="dark"] input[readonly] { background: #1e1e2e; color: var(--text-muted); }
[data-theme="dark"] input:focus, [data-theme="dark"] textarea:focus, [data-theme="dark"] select:focus { box-shadow: 0 0 0 3px rgba(108,92,231,0.2); border-color: var(--primary); }
[data-theme="dark"] .my-comment-item { background: #22223a; border-color: var(--border); }
[data-theme="dark"] .avatar-edit-label { background: #2a2a3e; }
[data-theme="dark"] .section-title { color: var(--text); }
[data-theme="dark"] .divider { border-color: var(--border); }
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: 'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  background-color: var(--bg); color: var(--text);
  min-height: 100vh; line-height: 1.6;
}
a { text-decoration: none; color: inherit; }
button { cursor: pointer; border: none; outline: none; }
input, textarea, select {
  font-family: inherit; font-size: 1rem;
  border: 1.5px solid var(--border); border-radius: var(--radius-sm);
  padding: 10px 14px; background: #fff; color: var(--text);
  transition: var(--transition); outline: none; width: 100%;
}
input:focus, textarea:focus, select:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(108,92,231,0.12); }

/* ===== NAV ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-h); background: #fff;
  box-shadow: 0 2px 12px rgba(108,92,231,0.08);
  display: flex; align-items: center; padding: 0 28px; gap: 16px;
}
.navbar .logo {
  font-size: 1.4rem; font-weight: 800; color: var(--primary);
  display: flex; align-items: center; gap: 8px; flex-shrink: 0;
}
.navbar .logo span { font-size: 1.6rem; }
.navbar .nav-links { display: flex; align-items: center; gap: 4px; flex: 1; }
.navbar .nav-links a {
  padding: 7px 16px; border-radius: 20px; font-size: 0.95rem;
  color: var(--text-muted); font-weight: 500;
  transition: var(--transition);
}
.navbar .nav-links a:hover, .navbar .nav-links a.active {
  background: rgba(108,92,231,0.1); color: var(--primary);
}
.navbar .nav-right { display: flex; align-items: center; gap: 10px; margin-left: auto; }
.nav-avatar {
  width: 36px; height: 36px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 700; font-size: 0.9rem; cursor: pointer;
  overflow: hidden; flex-shrink: 0;
}
.nav-avatar img { width: 100%; height: 100%; object-fit: cover; }
.page-wrap { padding-top: var(--nav-h); padding-bottom: 40px; max-width: 1200px; margin: 0 auto; padding-left: 24px; padding-right: 24px; }

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 10px 22px; border-radius: 24px; font-size: 0.95rem; font-weight: 600;
  transition: var(--transition); cursor: pointer; border: none;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 4px 14px rgba(108,92,231,0.35); }
.btn-outline { background: transparent; color: var(--primary); border: 1.5px solid var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; }
.btn-ghost { background: rgba(108,92,231,0.08); color: var(--primary); }
.btn-ghost:hover { background: rgba(108,92,231,0.16); }
.btn-danger { background: #ff7675; color: #fff; }
.btn-danger:hover { background: #d63031; }
.btn-sm { padding: 6px 14px; font-size: 0.85rem; border-radius: 16px; }
.btn-icon { padding: 8px; border-radius: 50%; width: 36px; height: 36px; }

/* ===== CARDS ===== */
.card {
  background: var(--card-bg); border-radius: var(--radius);
  box-shadow: var(--shadow); overflow: hidden;
  transition: var(--transition);
}
.card:hover { box-shadow: var(--shadow-hover); transform: translateY(-2px); }

/* ===== BOOK CARD ===== */
.book-card {
  background: var(--card-bg); border-radius: var(--radius);
  box-shadow: var(--shadow); overflow: hidden;
  transition: var(--transition); cursor: pointer; position: relative;
}
.book-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); }
.book-cover {
  width: 100%; aspect-ratio: 3/4; object-fit: cover;
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  display: flex; align-items: center; justify-content: center;
  font-size: 2.5rem; color: #fff; position: relative; overflow: hidden;
}
.book-cover img { width: 100%; height: 100%; object-fit: cover; position: absolute; inset: 0; }
.book-cover .cover-title {
  position: relative; z-index: 1; text-align: center; padding: 10px;
  font-size: 1.1rem; font-weight: 700; text-shadow: 0 2px 8px rgba(0,0,0,0.3);
}
.book-info { padding: 12px 14px 14px; }
.book-title { font-weight: 700; font-size: 1rem; margin-bottom: 4px; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.book-author { font-size: 0.82rem; color: var(--text-muted); margin-bottom: 8px; }
.book-meta { display: flex; align-items: center; gap: 10px; font-size: 0.78rem; color: var(--text-muted); }
.book-meta span { display: flex; align-items: center; gap: 3px; }
.book-badge {
  position: absolute; top: 10px; right: 10px; padding: 3px 9px;
  border-radius: 10px; font-size: 0.72rem; font-weight: 700;
  background: rgba(108,92,231,0.85); color: #fff; backdrop-filter: blur(4px);
}
.book-badge.top { background: rgba(253,121,168,0.9); }

/* ===== GRID ===== */
.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 20px;
}

/* ===== CATEGORY TABS ===== */
.cat-tabs { display: flex; flex-wrap: nowrap; gap: 8px; margin-bottom: 24px; overflow-x: auto; scrollbar-width: none; padding-bottom: 4px; }
.cat-tabs::-webkit-scrollbar { display: none; }
.cat-tab {
  padding: 7px 18px; border-radius: 20px; font-size: 0.9rem; font-weight: 500;
  background: #fff; color: var(--text-muted); border: 1.5px solid var(--border);
  cursor: pointer; transition: var(--transition); flex-shrink: 0; white-space: nowrap;
}
.cat-tab:hover { border-color: var(--primary); color: var(--primary); }
.cat-tab.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ===== MODAL ===== */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.45);
  z-index: 300; display: flex; align-items: center; justify-content: center;
  padding: 20px; backdrop-filter: blur(3px);
  animation: fadeIn 0.2s ease;
}
.modal {
  background: #fff; border-radius: 20px; width: 100%; max-width: 480px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.2); overflow: hidden;
  animation: slideUp 0.25s ease;
}
.modal-header {
  padding: 20px 24px 16px; border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
}
.modal-header h3 { font-size: 1.15rem; font-weight: 700; }
.modal-body { padding: 20px 24px; }
.modal-footer { padding: 14px 24px 20px; display: flex; gap: 10px; justify-content: flex-end; }
.modal-close { background: none; color: var(--text-muted); font-size: 1.3rem; line-height: 1; padding: 4px 8px; border-radius: 6px; }
.modal-close:hover { background: var(--bg); color: var(--text); }

/* ===== FORM ===== */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 0.9rem; font-weight: 600; margin-bottom: 6px; color: var(--text); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }

/* ===== TOAST ===== */
#toast-container {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  z-index: 9999; display: flex; flex-direction: column; gap: 8px; pointer-events: none;
}
.toast {
  padding: 12px 22px; border-radius: 24px; font-size: 0.9rem; font-weight: 600;
  color: #fff; box-shadow: 0 4px 20px rgba(0,0,0,0.2);
  animation: slideUp 0.3s ease, fadeOut 0.4s ease 2.6s forwards;
  pointer-events: auto; white-space: nowrap;
}
.toast.success { background: linear-gradient(135deg,#00b894,#00cec9); }
.toast.error   { background: linear-gradient(135deg,#ff7675,#d63031); }
.toast.info    { background: linear-gradient(135deg,var(--primary),var(--primary-light)); }

/* ===== MISC ===== */
.section-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 18px; }
.section-title { font-size: 1.25rem; font-weight: 800; color: var(--text); display: flex; align-items: center; gap: 8px; }
.divider { height: 1px; background: var(--border); margin: 20px 0; }
.empty-state { text-align: center; padding: 60px 20px; color: var(--text-muted); }
.empty-state .icon { font-size: 3.5rem; margin-bottom: 16px; opacity: 0.5; }
.empty-state p { font-size: 1rem; }
.badge { display: inline-block; padding: 2px 10px; border-radius: 10px; font-size: 0.78rem; font-weight: 700; }
.badge-purple { background: rgba(108,92,231,0.12); color: var(--primary); }
.badge-pink   { background: rgba(253,121,168,0.15); color: #e84393; }
.badge-green  { background: rgba(0,184,148,0.12); color: #00b894; }
.tag-list { display: flex; flex-wrap: wrap; gap: 6px; }
.spinner { display: inline-block; width: 22px; height: 22px; border: 3px solid rgba(108,92,231,0.2); border-top-color: var(--primary); border-radius: 50%; animation: spin 0.7s linear infinite; }

@keyframes fadeIn   { from{opacity:0} to{opacity:1} }
@keyframes fadeOut  { from{opacity:1} to{opacity:0} }
@keyframes slideUp  { from{opacity:0;transform:translateY(20px)} to{opacity:1;transform:translateY(0)} }
@keyframes spin     { to{transform:rotate(360deg)} }

/* ===== SEARCH BAR ===== */
.search-bar {
  display: flex; align-items: center; gap: 0;
  background: #fff; border: 1.5px solid var(--border);
  border-radius: 28px; overflow: hidden; flex: 1; max-width: 400px;
  transition: var(--transition);
}
.search-bar:focus-within { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(108,92,231,0.1); }
.search-bar input { border: none; box-shadow: none; padding: 9px 16px; flex: 1; background: transparent; font-size: 0.92rem; }
.search-bar input:focus { box-shadow: none; border: none; }

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(108,92,231,0.25); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(108,92,231,0.45); }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .page-wrap { padding-left: 16px; padding-right: 16px; }
  .navbar { padding: 0 16px; }
  .form-row { grid-template-columns: 1fr; }
  .books-grid { grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 14px; }
}