:root {
  --bg: #f5f7fb;
  --card: #ffffff;
  --muted: #6b7280;
  --accent: #3b82f6;
  --accent-2: #2563eb;
  --text: #0b1220;
  --radius: 12px;
  --shadow: 0 14px 40px rgba(12, 20, 40, 0.08);
  --gap: 16px;
  --container-w: 1100px;
  --transition: 180ms;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial;
}

* {
  box-sizing: border-box
}

html,
body {
  height: 100%;
  margin: 0
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.36;
}

/* layout */
.container {
  width: 100%;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 20px
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  background: rgba(30, 30, 30, 0.8);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 20;
}

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

.brand img {
  width: 52px;
  height: 52px;
  object-fit: contain;
  border-radius: 8px
}

.brand h1 {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 800
}

/* header right group */
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px
}

.small-muted {
  font-size: 0.92rem;
  color: var(--muted)
}

/* main */
.main {
  padding: 26px 0
}

.grid {
  display: grid;
  gap: var(--gap)
}

.grid.cols-3 {
  grid-template-columns: repeat(3, 1fr)
}

.grid.cols-2 {
  grid-template-columns: repeat(2, 1fr)
}

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

/* card */
.card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(2, 6, 23, 0.04);
}

.stat-card {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 10px 14px;
  border-radius: 10px
}

.stat-card .num {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--accent)
}

/* controls */
.controls {
  display: flex;
  gap: 10px;
  flex-wrap: wrap
}

.input {
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid rgba(2, 6, 23, 0.06);
  background: linear-gradient(180deg, #fff, #fbfdff);
  min-width: 180px
}

.btn {
  padding: 10px 12px;
  border-radius: 10px;
  border: 0;
  cursor: pointer;
  font-weight: 700
}

.btn.primary {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  color: #fff;
  box-shadow: 0 8px 26px rgba(12, 109, 255, 0.08)
}

.btn.outline {
  background: transparent;
  border: 1px solid rgba(2, 6, 23, 0.06);
  color: var(--muted)
}

.btn.ghost {
  background: transparent;
  color: var(--muted)
}

/* list / cards grid */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: 14px
}

.card-list-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-radius: 10px;
  padding: 12px;
  border: 1px solid rgba(2, 6, 23, 0.04);
  transition: box-shadow var(--transition);
  cursor: pointer;
  background: linear-gradient(180deg, #fff, #fbfdff)
}

.card-list-item:hover {
  box-shadow: 0 10px 30px rgba(2, 6, 23, 0.06)
}

.card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start
}

.card-meta {
  font-size: 0.95rem;
  color: var(--muted)
}

.card-stats {
  display: flex;
  gap: 8px;
  align-items: center
}

.badge {
  padding: 6px 8px;
  border-radius: 8px;
  font-weight: 700;
  font-size: 0.85rem;
  background: #f3f6ff;
  color: var(--accent)
}

/* selection checkbox */
.checkbox {
  width: 18px;
  height: 18px
}

/* modal (simple) */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(2, 6, 23, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 60
}

.modal {
  background: var(--card);
  border-radius: 12px;
  padding: 18px;
  max-width: 560px;
  width: 100%;
  box-shadow: 0 18px 48px rgba(2, 6, 23, 0.12)
}

.form-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap
}

/* responsive */
@media(min-width:900px) {
  .cards-grid {
    grid-template-columns: repeat(2, 1fr)
  }

  .grid.cols-3 {
    grid-template-columns: 1fr 340px 260px;
    gap: 18px
  }
}

@media(min-width:1200px) {
  .cards-grid {
    grid-template-columns: repeat(3, 1fr)
  }
}

@media(max-width:720px) {
  .brand img {
    width: 44px;
    height: 44px
  }

  .brand h1 {
    font-size: 1.05rem
  }

  .card-stats {
    flex-wrap: wrap
  }
}

/* =========== Dark Mode =========== */
[data-theme="dark"] {
  --bg: #0d1117;
  --card: #161b22;
  --muted: #8b949e;
  --accent: #4493f8;
  --accent-2: #388bfd;
  --text: #e6edf3;
  --shadow: 0 14px 40px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] body {
  background: var(--bg);
  color: var(--text);
}

[data-theme="dark"] .header {
  background: rgba(22, 27, 34, 0.85);
  border-bottom-color: #30363d;
  backdrop-filter: blur(12px);
}

[data-theme="dark"] .card {
  background: var(--card);
  border-color: #30363d;
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .card-list-item {
  background: #161b22;
  border-color: #30363d;
}

[data-theme="dark"] .card-list-item:hover {
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

[data-theme="dark"] .stat-card .num {
  color: var(--accent);
}

[data-theme="dark"] .input {
  background: #0d1117;
  border-color: #30363d;
  color: #e6edf3;
}

[data-theme="dark"] .input::placeholder {
  color: #6e7681;
}

[data-theme="dark"] .input:focus {
  border-color: #4493f8;
  box-shadow: 0 0 0 3px rgba(68, 147, 248, 0.15);
}

[data-theme="dark"] select,
[data-theme="dark"] textarea {
  background: #0d1117;
  border-color: #30363d;
  color: #e6edf3;
}

[data-theme="dark"] select option {
  background: #161b22;
  color: #e6edf3;
}

[data-theme="dark"] .badge {
  background: rgba(68, 147, 248, 0.15);
  color: #4493f8;
}

[data-theme="dark"] .btn.outline {
  background: transparent;
  border-color: #30363d;
  color: #8b949e;
}

[data-theme="dark"] .btn.outline:hover {
  border-color: #8b949e;
  color: #e6edf3;
}

[data-theme="dark"] .btn.ghost {
  color: #8b949e;
}

[data-theme="dark"] .btn.ghost:hover {
  color: #e6edf3;
}

[data-theme="dark"] .btn.primary {
  background: linear-gradient(90deg, #4493f8, #388bfd);
  color: #fff;
  box-shadow: 0 8px 26px rgba(68, 147, 248, 0.12);
}

[data-theme="dark"] .modal-backdrop {
  background: rgba(0, 0, 0, 0.6);
}

[data-theme="dark"] .modal {
  background: #161b22;
  border: 1px solid #30363d;
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.4);
  color: #e6edf3;
}

[data-theme="dark"] .dropdown-menu {
  background: #161b22;
  border-color: #30363d;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

[data-theme="dark"] .dropdown-menu a,
[data-theme="dark"] .dropdown-menu button {
  color: #e6edf3;
}

[data-theme="dark"] .dropdown-menu a:hover,
[data-theme="dark"] .dropdown-menu button:hover {
  background: #1c2128;
}

[data-theme="dark"] .small-muted {
  color: #8b949e;
}

[data-theme="dark"] .card-meta {
  color: #8b949e;
}

[data-theme="dark"] .brand h1 {
  color: #e6edf3;
}