:root {
  --app-bg-top: #f3f7f4;
  --app-bg-mid: #eef5ff;
  --app-bg-bottom: #fff9ef;
  --app-surface: #ffffff;
  --app-surface-soft: #f8fbff;
  --app-text: #1f2a37;
  --app-muted: #5c6b7a;
  --app-primary: #0d6b4a;
  --app-primary-strong: #0a553b;
  --app-accent: #f08a24;
  --app-border: #d8e3ef;
  --app-shadow: 0 10px 30px rgba(12, 52, 81, 0.12);
}

:root[data-theme="classic"] {
  --app-bg-top: #f3f7f4;
  --app-bg-mid: #eef5ff;
  --app-bg-bottom: #fff9ef;
  --app-surface: #ffffff;
  --app-surface-soft: #f8fbff;
  --app-text: #1f2a37;
  --app-muted: #5c6b7a;
  --app-primary: #0d6b4a;
  --app-primary-strong: #0a553b;
  --app-accent: #f08a24;
  --app-border: #d8e3ef;
  --app-shadow: 0 10px 30px rgba(12, 52, 81, 0.12);
}

:root[data-theme="ocean"] {
  --app-bg-top: #eef6fb;
  --app-bg-mid: #e7effd;
  --app-bg-bottom: #f8fcff;
  --app-surface: #ffffff;
  --app-surface-soft: #f4f9ff;
  --app-text: #11283a;
  --app-muted: #4c687f;
  --app-primary: #006d8f;
  --app-primary-strong: #005775;
  --app-accent: #f26f4f;
  --app-border: #cddfee;
  --app-shadow: 0 10px 30px rgba(0, 84, 120, 0.16);
}

:root[data-theme="contrast"] {
  --app-bg-top: #fafafa;
  --app-bg-mid: #ffffff;
  --app-bg-bottom: #f6f7f9;
  --app-surface: #ffffff;
  --app-surface-soft: #ffffff;
  --app-text: #0d0d0d;
  --app-muted: #2b2b2b;
  --app-primary: #111111;
  --app-primary-strong: #000000;
  --app-accent: #d86300;
  --app-border: #b9bec5;
  --app-shadow: 0 10px 25px rgba(0, 0, 0, 0.14);
}

html,
body {
  min-height: 100%;
}

body.app-shell {
  font-family: "Manrope", "Segoe UI", sans-serif;
  color: var(--app-text);
  background:
    radial-gradient(circle at 12% -8%, rgba(13, 107, 74, 0.14), transparent 30%),
    radial-gradient(circle at 88% -6%, rgba(240, 138, 36, 0.16), transparent 34%),
    linear-gradient(180deg, var(--app-bg-top) 0%, var(--app-bg-mid) 45%, var(--app-bg-bottom) 100%);
  background-attachment: fixed;
}

.app-navbar {
  background: linear-gradient(130deg, var(--app-primary-strong), var(--app-primary));
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 6px 20px rgba(13, 60, 52, 0.3);
  position: relative;
  z-index: 1040;
}

.app-navbar .navbar-brand {
  letter-spacing: 0.4px;
}

.app-navbar .nav-link {
  border-radius: 999px;
  margin-right: 0.35rem;
  padding: 0.45rem 0.8rem;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.app-navbar .nav-link:hover,
.app-navbar .nav-link:focus {
  background: rgba(255, 255, 255, 0.18);
}

.app-navbar .nav-link.active {
  background: rgba(255, 255, 255, 0.24);
  font-weight: 700;
}

.app-navbar .dropdown-menu {
  border: 1px solid var(--app-border);
  border-radius: 14px;
  box-shadow: var(--app-shadow);
  z-index: 1050;
}

.app-navbar .dropdown-item {
  border-radius: 10px;
  margin: 2px 6px;
  width: auto;
}

.app-navbar .dropdown-item:hover {
  background: #edf7f4;
  color: var(--app-primary-strong);
}

.container,
.container-fluid {
  position: relative;
  z-index: auto;
}

.card,
.modal-content,
.list-group-item {
  border: 1px solid var(--app-border);
  border-radius: 16px;
  box-shadow: 0 6px 18px rgba(16, 52, 80, 0.08);
}

.card {
  background: linear-gradient(180deg, var(--app-surface) 0%, var(--app-surface-soft) 100%);
}

.btn-primary {
  background: linear-gradient(140deg, var(--app-primary), var(--app-primary-strong));
  border: 0;
  box-shadow: 0 6px 16px rgba(20, 40, 60, 0.22);
}

.btn-primary:hover,
.btn-primary:focus {
  background: linear-gradient(140deg, #0c5d42, #0d6b4a);
}

.btn-outline-secondary {
  border-color: #b9c8d9;
  color: #3e5266;
}

.table {
  --bs-table-bg: transparent;
  --bs-table-border-color: #dbe6f2;
}

.table thead.table-dark {
  --bs-table-bg: #1a425f;
}

.dataTables_wrapper .dataTables_filter input,
.dataTables_wrapper .dataTables_length select,
.form-control,
.form-select {
  border-radius: 10px;
  border-color: #c7d5e4;
}

.badge,
.alert {
  border-radius: 12px;
}

.theme-swatch {
  display: inline-block;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 1px solid rgba(0, 0, 0, 0.15);
  margin-right: 6px;
}

.theme-choice {
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.theme-choice:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(16, 52, 80, 0.12);
}

.theme-choice.active {
  border-color: var(--app-primary);
  box-shadow: 0 0 0 2px rgba(13, 107, 74, 0.18);
}

@media (max-width: 991.98px) {
  .app-navbar .navbar-nav {
    gap: 0.25rem;
    padding-top: 0.5rem;
  }

  .app-navbar .d-flex.align-items-center {
    margin-top: 0.75rem;
    align-items: flex-start;
  }
}

@media (max-width: 576px) {
  body.app-shell {
    background-attachment: scroll;
  }

  .card,
  .modal-content,
  .list-group-item {
    border-radius: 12px;
  }
}