/* ====================================================
   任务管理系统 — 主题设计系统 v2.0
   5 种主题：经典蓝 · 暗夜黑 · 森林绿 · 玫瑰紫 · 琥珀橙
   ==================================================== */

/* ── 1. 主题变量定义 ─────────────────────────────── */

/* 主题：经典蓝（默认） */
body,
body.theme-classic {
  --nav-bg:               linear-gradient(135deg, #1e2a4a 0%, #1a3a6e 100%);
  --nav-text:             rgba(255, 255, 255, 0.88);
  --nav-hover:            #ffffff;
  --nav-active-border:    rgba(255, 255, 255, 0.85);
  --nav-brand-color:      #7eb8f7;
  --nav-dropdown-bg:      #1a3a6e;
  --nav-dropdown-text:    rgba(255, 255, 255, 0.88);
  --nav-dropdown-hover:   rgba(255, 255, 255, 0.12);

  --body-bg:              #eef2f7;
  --card-bg:              #ffffff;
  --card-shadow:          0 1px 4px rgba(0,0,0,.06), 0 4px 16px rgba(0,0,0,.06);
  --card-shadow-hover:    0 4px 12px rgba(0,0,0,.1),  0 12px 32px rgba(0,0,0,.1);
  --card-border:          1px solid rgba(0,0,0,.07);
  --card-header-bg:       #f8f9ff;
  --card-header-border:   1px solid rgba(67,97,238,.14);

  --primary:              #4361ee;
  --primary-dark:         #3451d1;
  --primary-light:        #eef0ff;
  --primary-rgb:          67, 97, 238;
  --primary-gradient:     linear-gradient(135deg, #4361ee 0%, #3a0ca3 100%);

  --text-primary:         #1a1f36;
  --text-secondary:       #4e5d78;
  --text-muted-color:     #8898aa;
  --border-color:         #e2e8f0;

  --input-bg:             #ffffff;
  --input-border:         #ced4da;
  --input-focus-border:   #4361ee;
  --input-focus-shadow:   0 0 0 .25rem rgba(67,97,238,.18);

  --table-stripe-bg:      rgba(67,97,238,.04);
  --table-hover-bg:       rgba(67,97,238,.07);
  --table-border-color:   #e9ecef;

  --modal-header-bg:      linear-gradient(135deg, #4361ee 0%, #3a0ca3 100%);
  --dropdown-bg:          #ffffff;
  --dropdown-text:        #1a1f36;
  --dropdown-hover-bg:    #f0f3ff;
  --dropdown-active-bg:   #4361ee;
  --dropdown-border:      rgba(0,0,0,.08);

  --btn-primary-shadow:   0 4px 12px rgba(67,97,238,.35);
  --link-color:           #4361ee;
  --scrollbar-thumb:      #c1cce4;
  --scrollbar-track:      #eef2f7;
  --page-fade-in:         1;
}

/* 主题：暗夜星空 */
body.theme-dark {
  --nav-bg:               linear-gradient(135deg, #060a14 0%, #0d1b2e 100%);
  --nav-text:             rgba(209, 222, 240, 0.9);
  --nav-hover:            #e0eeff;
  --nav-active-border:    rgba(99,179,237,.9);
  --nav-brand-color:      #63b3ed;
  --nav-dropdown-bg:      #0d1b2e;
  --nav-dropdown-text:    rgba(209,222,240,.9);
  --nav-dropdown-hover:   rgba(255,255,255,.08);

  --body-bg:              #0d1117;
  --card-bg:              #161b22;
  --card-shadow:          0 1px 4px rgba(0,0,0,.4), 0 4px 16px rgba(0,0,0,.3);
  --card-shadow-hover:    0 4px 12px rgba(0,0,0,.5), 0 12px 32px rgba(0,0,0,.4);
  --card-border:          1px solid rgba(255,255,255,.07);
  --card-header-bg:       #0d1117;
  --card-header-border:   1px solid rgba(255,255,255,.07);

  --primary:              #58a6ff;
  --primary-dark:         #4291e0;
  --primary-light:        rgba(88,166,255,.15);
  --primary-rgb:          88, 166, 255;
  --primary-gradient:     linear-gradient(135deg, #58a6ff 0%, #4291e0 100%);

  --text-primary:         #c9d1d9;
  --text-secondary:       #8b949e;
  --text-muted-color:     #6e7681;
  --border-color:         rgba(255,255,255,.08);

  --input-bg:             #0d1117;
  --input-border:         rgba(255,255,255,.14);
  --input-focus-border:   #58a6ff;
  --input-focus-shadow:   0 0 0 .25rem rgba(88,166,255,.2);

  --table-stripe-bg:      rgba(255,255,255,.03);
  --table-hover-bg:       rgba(255,255,255,.05);
  --table-border-color:   rgba(255,255,255,.07);

  --modal-header-bg:      linear-gradient(135deg, #1a365d 0%, #2c5282 100%);
  --dropdown-bg:          #1c2230;
  --dropdown-text:        #c9d1d9;
  --dropdown-hover-bg:    rgba(255,255,255,.07);
  --dropdown-active-bg:   #58a6ff;
  --dropdown-border:      rgba(255,255,255,.08);

  --btn-primary-shadow:   0 4px 12px rgba(66,153,225,.35);
  --link-color:           #58a6ff;
  --scrollbar-thumb:      #30363d;
  --scrollbar-track:      #0d1117;
}

/* 主题：自然森绿 */
body.theme-forest {
  --nav-bg:               linear-gradient(135deg, #0a2e1a 0%, #145a32 100%);
  --nav-text:             rgba(255, 255, 255, 0.88);
  --nav-hover:            #ffffff;
  --nav-active-border:    rgba(134,239,172,.9);
  --nav-brand-color:      #86efac;
  --nav-dropdown-bg:      #145a32;
  --nav-dropdown-text:    rgba(255,255,255,.88);
  --nav-dropdown-hover:   rgba(255,255,255,.12);

  --body-bg:              #f0fdf4;
  --card-bg:              #ffffff;
  --card-shadow:          0 1px 4px rgba(0,0,0,.05), 0 4px 16px rgba(21,128,61,.06);
  --card-shadow-hover:    0 4px 12px rgba(0,0,0,.08), 0 12px 32px rgba(21,128,61,.1);
  --card-border:          1px solid rgba(21,128,61,.1);
  --card-header-bg:       #f0fdf4;
  --card-header-border:   1px solid rgba(21,128,61,.14);

  --primary:              #16a34a;
  --primary-dark:         #15803d;
  --primary-light:        #dcfce7;
  --primary-rgb:          22, 163, 74;
  --primary-gradient:     linear-gradient(135deg, #16a34a 0%, #15803d 100%);

  --text-primary:         #14532d;
  --text-secondary:       #4b7c5e;
  --text-muted-color:     #86a894;
  --border-color:         #d1fae5;

  --input-bg:             #ffffff;
  --input-border:         #a7f3d0;
  --input-focus-border:   #16a34a;
  --input-focus-shadow:   0 0 0 .25rem rgba(22,163,74,.18);

  --table-stripe-bg:      rgba(22,163,74,.04);
  --table-hover-bg:       rgba(22,163,74,.07);
  --table-border-color:   #d1fae5;

  --modal-header-bg:      linear-gradient(135deg, #0a2e1a 0%, #145a32 100%);
  --dropdown-bg:          #ffffff;
  --dropdown-text:        #14532d;
  --dropdown-hover-bg:    #f0fdf4;
  --dropdown-active-bg:   #16a34a;
  --dropdown-border:      rgba(21,128,61,.1);

  --btn-primary-shadow:   0 4px 12px rgba(22,163,74,.35);
  --link-color:           #16a34a;
  --scrollbar-thumb:      #a7f3d0;
  --scrollbar-track:      #f0fdf4;
}

/* 主题：玫瑰晨曦 */
body.theme-rose {
  --nav-bg:               linear-gradient(135deg, #3b0764 0%, #7c3aed 100%);
  --nav-text:             rgba(255, 255, 255, 0.88);
  --nav-hover:            #ffffff;
  --nav-active-border:    rgba(249,168,212,.9);
  --nav-brand-color:      #f0abfc;
  --nav-dropdown-bg:      #6d28d9;
  --nav-dropdown-text:    rgba(255,255,255,.88);
  --nav-dropdown-hover:   rgba(255,255,255,.12);

  --body-bg:              #fdf4ff;
  --card-bg:              #ffffff;
  --card-shadow:          0 1px 4px rgba(0,0,0,.05), 0 4px 16px rgba(168,85,247,.06);
  --card-shadow-hover:    0 4px 12px rgba(0,0,0,.08), 0 12px 32px rgba(168,85,247,.1);
  --card-border:          1px solid rgba(168,85,247,.1);
  --card-header-bg:       #fdf4ff;
  --card-header-border:   1px solid rgba(168,85,247,.14);

  --primary:              #a855f7;
  --primary-dark:         #9333ea;
  --primary-light:        #faf5ff;
  --primary-rgb:          168, 85, 247;
  --primary-gradient:     linear-gradient(135deg, #c026d3 0%, #7c3aed 100%);

  --text-primary:         #3b0764;
  --text-secondary:       #7e4a7c;
  --text-muted-color:     #c084fc;
  --border-color:         #f3e8ff;

  --input-bg:             #ffffff;
  --input-border:         #e9d5ff;
  --input-focus-border:   #a855f7;
  --input-focus-shadow:   0 0 0 .25rem rgba(168,85,247,.18);

  --table-stripe-bg:      rgba(168,85,247,.04);
  --table-hover-bg:       rgba(168,85,247,.07);
  --table-border-color:   #f3e8ff;

  --modal-header-bg:      linear-gradient(135deg, #7c3aed 0%, #c026d3 100%);
  --dropdown-bg:          #ffffff;
  --dropdown-text:        #3b0764;
  --dropdown-hover-bg:    #fdf4ff;
  --dropdown-active-bg:   #a855f7;
  --dropdown-border:      rgba(168,85,247,.1);

  --btn-primary-shadow:   0 4px 12px rgba(168,85,247,.35);
  --link-color:           #9333ea;
  --scrollbar-thumb:      #e9d5ff;
  --scrollbar-track:      #fdf4ff;
}

/* 主题：琥珀暖阳 */
body.theme-amber {
  --nav-bg:               linear-gradient(135deg, #431407 0%, #9a3412 100%);
  --nav-text:             rgba(255, 255, 255, 0.88);
  --nav-hover:            #ffffff;
  --nav-active-border:    rgba(253,186,116,.9);
  --nav-brand-color:      #fdba74;
  --nav-dropdown-bg:      #9a3412;
  --nav-dropdown-text:    rgba(255,255,255,.88);
  --nav-dropdown-hover:   rgba(255,255,255,.12);

  --body-bg:              #fffbf0;
  --card-bg:              #ffffff;
  --card-shadow:          0 1px 4px rgba(0,0,0,.05), 0 4px 16px rgba(234,88,12,.06);
  --card-shadow-hover:    0 4px 12px rgba(0,0,0,.08), 0 12px 32px rgba(234,88,12,.1);
  --card-border:          1px solid rgba(234,88,12,.1);
  --card-header-bg:       #fff7ed;
  --card-header-border:   1px solid rgba(234,88,12,.14);

  --primary:              #ea580c;
  --primary-dark:         #c2410c;
  --primary-light:        #fff7ed;
  --primary-rgb:          234, 88, 12;
  --primary-gradient:     linear-gradient(135deg, #f97316 0%, #ea580c 100%);

  --text-primary:         #431407;
  --text-secondary:       #7c4a2a;
  --text-muted-color:     #c2856a;
  --border-color:         #fed7aa;

  --input-bg:             #ffffff;
  --input-border:         #fdba74;
  --input-focus-border:   #ea580c;
  --input-focus-shadow:   0 0 0 .25rem rgba(234,88,12,.18);

  --table-stripe-bg:      rgba(234,88,12,.04);
  --table-hover-bg:       rgba(234,88,12,.07);
  --table-border-color:   #fed7aa;

  --modal-header-bg:      linear-gradient(135deg, #9a3412 0%, #ea580c 100%);
  --dropdown-bg:          #ffffff;
  --dropdown-text:        #431407;
  --dropdown-hover-bg:    #fff7ed;
  --dropdown-active-bg:   #ea580c;
  --dropdown-border:      rgba(234,88,12,.1);

  --btn-primary-shadow:   0 4px 12px rgba(234,88,12,.35);
  --link-color:           #ea580c;
  --scrollbar-thumb:      #fdba74;
  --scrollbar-track:      #fff7ed;
}


/* ── 2. 全局基础 ─────────────────────────────────── */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont,
               'PingFang SC', 'Microsoft YaHei', sans-serif;
  font-size: .9375rem;
  background-color: var(--body-bg) !important;
  color: var(--text-primary);
  transition: background-color .35s ease, color .35s ease;
}

/* 自定义滚动条（Chromium） */
::-webkit-scrollbar       { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--scrollbar-track); }
::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { filter: brightness(.9); }

.min-width-0 { min-width: 0; }


/* ── 3. 导航栏 ───────────────────────────────────── */

.navbar {
  background: var(--nav-bg) !important;
  box-shadow: 0 2px 20px rgba(0,0,0,.22);
  padding-top: .55rem;
  padding-bottom: .55rem;
}

.navbar-brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--nav-brand-color) !important;
  letter-spacing: -.01em;
  transition: opacity .15s ease;
}
.navbar-brand:hover { opacity: .85; }

.navbar .nav-link {
  color: var(--nav-text) !important;
  font-size: .875rem;
  font-weight: 500;
  padding: .45rem .7rem;
  border-radius: 6px;
  transition: color .15s ease, background-color .15s ease;
}
.navbar .nav-link:hover,
.navbar .nav-link:focus {
  color: var(--nav-hover) !important;
  background-color: rgba(255,255,255,.09);
}
.navbar-nav .nav-link.active {
  color: var(--nav-hover) !important;
  font-weight: 600;
  border-bottom: 2px solid var(--nav-active-border);
}

/* 导航栏下拉菜单 */
.navbar .dropdown-menu {
  background-color: var(--nav-dropdown-bg) !important;
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 10px;
  box-shadow: 0 8px 32px rgba(0,0,0,.28);
  padding: 5px;
  min-width: 155px;
  margin-top: 6px;
}
.navbar .dropdown-item {
  color: var(--nav-dropdown-text) !important;
  border-radius: 6px;
  padding: .42rem .8rem;
  font-size: .865rem;
  transition: background-color .15s ease;
}
.navbar .dropdown-item:hover {
  background-color: var(--nav-dropdown-hover) !important;
  color: #fff !important;
}
.navbar .dropdown-item.active,
.navbar .dropdown-item:active {
  background-color: rgba(255,255,255,.2) !important;
}
.navbar .dropdown-divider {
  border-color: rgba(255,255,255,.14);
  margin: 4px 0;
}
.navbar-toggler {
  border-color: rgba(255,255,255,.3);
}
.navbar-toggler-icon {
  filter: invert(1);
}


/* ── 4. 内容区布局 ───────────────────────────────── */

main.container {
  animation: fadeIn .25s ease;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}


/* ── 5. 卡片 ─────────────────────────────────────── */

.card {
  background-color: var(--card-bg) !important;
  border: var(--card-border) !important;
  box-shadow: var(--card-shadow) !important;
  border-radius: 12px;
  transition: box-shadow .2s ease, transform .15s ease;
}
.card:hover {
  box-shadow: var(--card-shadow-hover) !important;
}
.card-header {
  background-color: var(--card-header-bg) !important;
  border-bottom: var(--card-header-border) !important;
  border-radius: 12px 12px 0 0 !important;
  font-weight: 600;
  font-size: .935rem;
  padding: .8rem 1.1rem;
}
.card-body {
  color: var(--text-primary);
}
.card-footer {
  background-color: var(--card-header-bg) !important;
  border-top: var(--card-header-border) !important;
  border-radius: 0 0 12px 12px !important;
}


/* ── 6. 按钮 ─────────────────────────────────────── */

.btn {
  border-radius: 8px;
  font-weight: 500;
  font-size: .875rem;
  transition: all .18s ease;
}
.btn:hover   { transform: translateY(-1px); }
.btn:active  { transform: translateY(0); }

.btn-primary {
  background: var(--primary-gradient) !important;
  border-color: var(--primary) !important;
  color: #fff !important;
  box-shadow: var(--btn-primary-shadow);
}
.btn-primary:hover {
  filter: brightness(1.08);
}
.btn-primary:focus,
.btn-primary:active {
  box-shadow: var(--btn-primary-shadow), 0 0 0 .25rem rgba(var(--primary-rgb),.3) !important;
}

.btn-outline-primary {
  color: var(--primary) !important;
  border-color: var(--primary) !important;
}
.btn-outline-primary:hover {
  background-color: var(--primary) !important;
  color: #fff !important;
}

.btn-outline-danger:hover { transform: translateY(-1px); }
.btn-secondary { transition: all .18s ease; }
.btn-secondary:hover { transform: translateY(-1px); }


/* ── 7. 表单 ─────────────────────────────────────── */

.form-control,
.form-select {
  background-color: var(--input-bg) !important;
  border-color: var(--input-border) !important;
  color: var(--text-primary) !important;
  border-radius: 8px;
  font-size: .9rem;
  transition: border-color .18s ease, box-shadow .18s ease;
}
.form-control::placeholder { color: var(--text-muted-color); opacity: .7; }
.form-control:focus,
.form-select:focus {
  border-color: var(--input-focus-border) !important;
  box-shadow: var(--input-focus-shadow) !important;
  outline: none;
}
.form-label {
  font-weight: 500;
  color: var(--text-secondary);
  font-size: .875rem;
  margin-bottom: .3rem;
}
.form-check-input:checked {
  background-color: var(--primary) !important;
  border-color: var(--primary) !important;
}

/* 暗夜主题 select option */
body.theme-dark .form-select option {
  background-color: #1c2230;
  color: #c9d1d9;
}


/* ── 8. 表格 ─────────────────────────────────────── */

.table {
  color: var(--text-primary);
  border-color: var(--table-border-color);
}
.table th {
  white-space: nowrap;
  font-size: .845rem;
  font-weight: 600;
  color: var(--text-secondary);
  border-bottom: 2px solid var(--table-border-color) !important;
  background-color: var(--card-header-bg) !important;
}
.table td {
  border-color: var(--table-border-color) !important;
  vertical-align: middle;
}
.table-striped > tbody > tr:nth-of-type(odd) > * {
  background-color: var(--table-stripe-bg) !important;
  color: var(--text-primary);
}
.table-hover > tbody > tr:hover > * {
  background-color: var(--table-hover-bg) !important;
}


/* ── 9. 徽章 ─────────────────────────────────────── */

.badge {
  border-radius: 6px;
  font-weight: 500;
  font-size: .78rem;
  padding: .3em .6em;
}
.badge.bg-primary {
  background: var(--primary-gradient) !important;
}


/* ── 10. 下拉菜单（非导航栏） ────────────────────── */

/* 内容区的下拉菜单（如用户下拉或其他下拉） 已通过 .navbar 的规则处理 */


/* ── 11. 消息提示 ─────────────────────────────────── */

.alert {
  border-radius: 10px;
  border: none;
  font-size: .9rem;
}
.alert-debug   { background-color: #d1e7dd; color: #0f5132; }
.alert-success { }
.alert-info    { }
.alert-warning { }
.alert-error   { background-color: #f8d7da; border-color: #f5c2c7; color: #842029; }

body.theme-dark .alert-info {
  background-color: rgba(88,166,255,.12);
  color: #93c5fd;
  border: 1px solid rgba(88,166,255,.2);
}
body.theme-dark .alert-success {
  background-color: rgba(74,222,128,.1);
  color: #86efac;
  border: 1px solid rgba(74,222,128,.2);
}
body.theme-dark .alert-warning {
  background-color: rgba(250,204,21,.1);
  color: #fde68a;
  border: 1px solid rgba(250,204,21,.2);
}
body.theme-dark .alert-error,
body.theme-dark .alert-danger {
  background-color: rgba(248,113,113,.1);
  color: #fca5a5;
  border: 1px solid rgba(248,113,113,.2);
}
body.theme-dark .alert-debug {
  background-color: rgba(74,222,128,.1);
  color: #86efac;
}


/* ── 12. Modal ───────────────────────────────────── */

.modal-content {
  background-color: var(--card-bg) !important;
  border: var(--card-border) !important;
  border-radius: 14px;
  box-shadow: 0 20px 60px rgba(0,0,0,.25);
  overflow: hidden;
}
.modal-header {
  background: var(--modal-header-bg) !important;
  border-bottom: none;
  padding: 1rem 1.25rem;
}
.modal-title { color: #fff !important; }
.modal-body  { color: var(--text-primary); padding: 1.25rem; }
.modal-footer {
  background-color: var(--card-header-bg) !important;
  border-top: var(--card-header-border) !important;
  padding: .85rem 1.25rem;
}


/* ── 13. list-group ──────────────────────────────── */

.list-group-item {
  font-size: .9rem;
  background-color: var(--card-bg) !important;
  color: var(--text-primary) !important;
  border-color: var(--border-color) !important;
}
.list-group-item.active {
  background-color: var(--primary) !important;
  border-color: var(--primary) !important;
  color: #fff !important;
}


/* ── 14. 分页 ────────────────────────────────────── */

.page-link {
  color: var(--primary) !important;
  border-color: var(--border-color) !important;
  background-color: var(--card-bg) !important;
  border-radius: 6px;
  margin: 0 2px;
  transition: all .15s ease;
}
.page-link:hover {
  background-color: var(--primary-light) !important;
  color: var(--primary-dark) !important;
}
.page-item.active .page-link {
  background: var(--primary-gradient) !important;
  border-color: var(--primary) !important;
  color: #fff !important;
}
.page-item.disabled .page-link {
  background-color: var(--card-header-bg) !important;
  color: var(--text-muted-color) !important;
}


/* ── 15. 工具类辅助 ──────────────────────────────── */

.text-muted { color: var(--text-muted-color) !important; }

a:not(.btn):not(.nav-link):not(.navbar-brand):not(.dropdown-item):not(.page-link) {
  color: var(--link-color);
}
a:not(.btn):not(.nav-link):not(.navbar-brand):not(.dropdown-item):not(.page-link):hover {
  color: var(--primary-dark);
}

/* 暗夜主题：覆盖 Bootstrap .bg-light / .bg-white */
body.theme-dark .bg-light,
body.theme-dark .bg-white {
  background-color: var(--card-bg) !important;
  color: var(--text-primary) !important;
}
body.theme-dark .text-dark   { color: var(--text-primary) !important; }
body.theme-dark .border       { border-color: var(--border-color) !important; }
body.theme-dark .border-bottom,
body.theme-dark .border-top   { border-color: var(--border-color) !important; }


/* ── 16. 日历视图 ────────────────────────────────── */

.calendar-table {
  table-layout: fixed;
}
.calendar-table th,
.calendar-table td {
  width: 14.28%;
}
.calendar-cell {
  height: 110px;
  vertical-align: top;
  padding: 6px !important;
  overflow: hidden;
}
.calendar-day-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  font-size: .85rem;
  font-weight: 600;
  margin-bottom: 2px;
  flex-shrink: 0;
  border-radius: 50%;
}
.calendar-today {
  background-color: rgba(var(--primary-rgb), .08) !important;
}
.calendar-today .calendar-day-number {
  background-color: var(--primary) !important;
  color: #fff !important;
}

/* 用户点击后选中的日期格子 */
.calendar-date-selected {
  background-color: rgba(var(--primary-rgb), .18) !important;
  box-shadow: inset 0 0 0 2px var(--primary);
}

.calendar-task {
  display: block;
  font-size: .72rem;
  padding: 2px 5px;
  border-radius: 4px;
  cursor: pointer;
  line-height: 1.4;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition: opacity .15s;
}
.calendar-task:hover {
  opacity: .82;
  text-decoration: none !important;
}


/* ── 17. 主题选择器页面专用样式 ──────────────────── */

.theme-card {
  cursor: pointer;
  border-radius: 14px !important;
  overflow: hidden;
  transition: transform .2s ease, box-shadow .2s ease !important;
  position: relative;
}
.theme-card:hover {
  transform: translateY(-4px) !important;
  box-shadow: 0 12px 36px rgba(0,0,0,.16) !important;
}
.theme-card.selected {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
}
.theme-card .theme-badge-check {
  position: absolute;
  top: 10px;
  right: 10px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .85rem;
  box-shadow: 0 2px 8px rgba(0,0,0,.2);
}
.theme-preview-bar {
  height: 8px;
  border-radius: 4px;
  margin-bottom: 2px;
}
.theme-swatch {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: inline-block;
  border: 2px solid rgba(255,255,255,.5);
  box-shadow: 0 1px 3px rgba(0,0,0,.15);
}


/* ── 18. 响应式 ──────────────────────────────────── */

@media (max-width: 768px) {
  .calendar-cell {
    height: 80px;
    padding: 4px !important;
  }
  .calendar-day-number {
    font-size: .75rem;
    width: 22px;
    height: 22px;
  }
  .calendar-task { font-size: .65rem; }

  .card { border-radius: 10px; }
  .card-header { border-radius: 10px 10px 0 0 !important; }
}

/* ── 优先级徽章（红 / 橙 / 黄 / 灰） ─────────────────── */
.badge-p1 { background-color: #dc3545; color: #fff; }
.badge-p2 { background-color: #fd7e14; color: #fff; }
.badge-p3 { background-color: #ffc107; color: #000; }
.badge-p4 { background-color: #6c757d; color: #fff; }

/* ── 紧急程度徽章（紫 / 蓝 / 青 / 灰） ──────────────── */
.badge-u1 { background-color: #6f42c1; color: #fff; }
.badge-u2 { background-color: #0d6efd; color: #fff; }
.badge-u3 { background-color: #0dcaf0; color: #000; }
.badge-u4 { background-color: #6c757d; color: #fff; }

/* ── 标签过滤下拉列表项 ── */
.tag-filter-item {
  transition: background-color .12s ease;
}
.tag-filter-item:hover {
  background-color: rgba(var(--primary-rgb), .07);
}
.tag-filter-item:has(input:checked) {
  background-color: rgba(var(--primary-rgb), .10);
}

/* ── 快速创建 Modal 标签按钮（btn-check + 自定义颜色变量 --tc） ── */
.quick-tag-btn {
  color: var(--tc);
  border-color: var(--tc);
  background-color: transparent;
  transition: background-color .15s, color .15s;
}

.quick-tag-btn:hover {
  background-color: color-mix(in srgb, var(--tc) 15%, transparent);
  border-color: var(--tc);
  color: var(--tc);
}

/* btn-check 选中状态：填充颜色 */
.btn-check:checked + .quick-tag-btn {
  background-color: var(--tc);
  border-color: var(--tc);
  color: #fff;
}

/* ── 过期任务行 ── */
.overdue-row {
  background-color: #fff5f5 !important;
  border-left: 4px solid #dc3545 !important;
}

.overdue-row:hover {
  background-color: #ffe8e8 !important;
}


/* ── 19. 行内编辑控件 ─────────────────────────────── */

/* 行内编辑 select / input：去掉多余的边框，只保留精简样式 */
.inline-edit {
  font-size: .8rem;
  padding: .2rem .35rem;
  border-radius: 6px;
  border: 1px solid transparent;
  transition: border-color .2s, box-shadow .2s, background-color .25s;
  cursor: pointer;
  width: 100%;
}

.inline-edit:focus {
  outline: none;
  box-shadow: 0 0 0 .2rem rgba(var(--primary-rgb), .25);
}

/* 优先级 / 紧急程度 select：由 JS 动态设置背景色 */
.level-select {
  font-weight: 600;
  text-align: center;
  color: #fff;
}

/* 暗色选项背景（Chrome/Edge） */
.level-select option {
  background-color: #fff;
  color: #333;
}

/* 日期 / 日期时间输入框 */
.date-input,
.datetime-input {
  background-color: var(--input-bg);
  color: var(--text-primary);
  border-color: var(--border-color);
  min-width: 130px;
}

.datetime-input {
  min-width: 180px;
}

.date-input:hover,
.datetime-input:hover {
  border-color: var(--input-focus-border);
}

/* 保存成功：短暂绿色边框 */
.inline-edit.border-success {
  border-color: #198754 !important;
  box-shadow: 0 0 0 .18rem rgba(25,135,84,.25);
}

/* 保存失败：短暂红色边框 */
.inline-edit.border-danger {
  border-color: #dc3545 !important;
  box-shadow: 0 0 0 .18rem rgba(220,53,69,.25);
}


/* ── 20. 日历拖拽 ─────────────────────────────────── */

/* 可拖任务：光标改为 grab */
.calendar-task[draggable="true"] {
  cursor: grab;
}
.calendar-task[draggable="true"]:active {
  cursor: grabbing;
}

/* 拖拽悬停时的目标单元格高亮 */
.calendar-drop-hover {
  background-color: rgba(var(--primary-rgb), .10) !important;
  outline: 2px dashed var(--primary) !important;
  outline-offset: -2px;
}

/* 放置区：有效日期单元格 hover 给一个淡提示 */
.calendar-drop-zone[data-date]:not(.calendar-drop-hover):hover {
  background-color: rgba(var(--primary-rgb), .04) !important;
}

/* 推迟到期：迷你日历（周一起算） */
.dropdown-toggle.dropdown-toggle-no-caret::after {
  display: none !important;
}

/* Edge 等浏览器：避免 list-group 裁剪下拉层；静态定位菜单在文档流内展开 */
.list-group-item.postpone-parent {
  overflow: visible;
}

/* 过期列表容器不裁剪下拉菜单（Edge / Popper 边界问题） */
#overdueTaskList.list-group {
  overflow: visible;
}

/* flex 行内下拉：禁止被压成 0 宽导致「展开了但空白」 */
.postpone-dropdown {
  position: relative;
  flex-shrink: 0;
  align-self: flex-start;
}

.postpone-calendar-menu.dropdown-menu {
  z-index: 1060;
  min-width: 288px;
  width: 288px;
  max-width: min(288px, calc(100vw - 1.5rem));
}

.mini-postpone-cal {
  min-height: 220px;
}

.postpone-cal-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
}

.postpone-cal-day {
  min-height: 2rem;
  padding: 0.15rem 0.25rem;
  font-size: 0.8rem;
  line-height: 1.2;
}

.postpone-cal-day.is-today {
  font-weight: 700;
}