/* =============================================================================
   Tegra Webinar Automation - Admin UI stylesheet (dark)
   Dependency-free dark theme. Class names and structural layout match the
   templates 1:1; everything visual is driven by the CSS variables below so a
   future light/system-preference toggle is a one-block change.
   ========================================================================== */

:root {
  color-scheme: dark;

  /* Surfaces */
  --bg: #0b0f17;
  --bg-elev: #111726;            /* hover background under a panel */
  --surface: #131a2a;            /* cards, top nav, inputs */
  --surface-2: #1a2236;          /* table-row hover, secondary buttons */
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.14);

  /* Text */
  --text: #e6eaf2;
  --text-muted: #8b95ab;
  --text-faint: #5f6a82;

  /* Brand */
  --primary: #6c8eff;
  --primary-dark: #5174ea;
  --primary-ink: #0a1228;        /* foreground over a primary background */
  --primary-soft: rgba(108, 142, 255, 0.16);
  --focus-ring: rgba(108, 142, 255, 0.32);

  /* Semantic colors (translucent backgrounds so they sit on dark surfaces) */
  --success: #34d399;
  --success-bg: rgba(52, 211, 153, 0.14);
  --success-border: rgba(52, 211, 153, 0.30);
  --warning: #fbbf24;
  --warning-bg: rgba(251, 191, 36, 0.14);
  --warning-border: rgba(251, 191, 36, 0.30);
  --danger: #f87171;
  --danger-bg: rgba(248, 113, 113, 0.14);
  --danger-border: rgba(248, 113, 113, 0.30);
  --info: #60a5fa;
  --info-bg: rgba(96, 165, 250, 0.14);
  --info-border: rgba(96, 165, 250, 0.30);

  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 1px 0 rgba(255, 255, 255, 0.03) inset,
            0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 1px 0 rgba(255, 255, 255, 0.03) inset,
               0 8px 24px rgba(0, 0, 0, 0.5);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
  font-size: 14px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Subtle background grid - adds depth without noise */
body {
  background-image:
    radial-gradient(1200px 600px at 80% -10%, rgba(108, 142, 255, 0.07), transparent 60%),
    radial-gradient(900px 500px at -10% 110%, rgba(96, 165, 250, 0.05), transparent 60%);
  background-attachment: fixed;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: #8fa8ff; text-decoration: none; }

h1, h2, h3 { color: var(--text); margin: 0 0 0.5rem; letter-spacing: -0.01em; }
h1 { font-size: 1.55rem; font-weight: 650; }
h2 { font-size: 1.1rem; font-weight: 600; }
h3 { font-size: 0.95rem; font-weight: 600; }

::selection { background: var(--primary-soft); color: var(--text); }

/* ---- Top nav ------------------------------------------------------------- */

.topnav {
  background: rgba(19, 26, 42, 0.72);
  backdrop-filter: saturate(140%) blur(12px);
  -webkit-backdrop-filter: saturate(140%) blur(12px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}
.topnav .nav-inner {
  max-width: 1180px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 0 1.5rem;
  height: 60px;
}
.topnav .brand {
  font-weight: 700;
  font-size: 1.02rem;
  color: var(--text);
  letter-spacing: -0.01em;
}
.topnav .brand:hover { color: var(--text); }
.topnav nav { display: flex; gap: 0.15rem; flex: 1; }
.topnav nav a {
  color: var(--text-muted);
  padding: 0.45rem 0.75rem;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 0.88rem;
  transition: color 120ms ease, background 120ms ease;
}
.topnav nav a:hover { background: var(--surface-2); color: var(--text); }
.topnav nav a.active {
  background: var(--primary-soft);
  color: #b6c5ff;
}
.topnav .nav-user { color: var(--text-muted); font-size: 0.82rem; }

/* ---- Layout -------------------------------------------------------------- */

.container {
  max-width: 1180px;
  margin: 1.75rem auto;
  padding: 0 1.5rem;
}

.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.page-header p.muted { margin: 0.15rem 0 0; }

/* ---- Cards --------------------------------------------------------------- */

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.35rem 1.4rem;
  margin-bottom: 1.25rem;
}
.card h2 { margin-top: 0; }

.grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.stat {
  background: linear-gradient(180deg, var(--surface) 0%, rgba(19, 26, 42, 0.7) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1rem 1.25rem;
  transition: border-color 120ms ease, transform 120ms ease;
}
.stat:hover { border-color: var(--border-strong); }
.stat .label {
  color: var(--text-muted);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
}
.stat .value {
  font-size: 1.9rem;
  font-weight: 700;
  margin-top: 0.35rem;
  color: var(--text);
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}
.stat .sub { color: var(--text-muted); font-size: 0.78rem; margin-top: 0.15rem; }

/* ---- Tables -------------------------------------------------------------- */

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}
thead th {
  text-align: left;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.7rem 0.85rem;
  border-bottom: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.15);
}
tbody td {
  padding: 0.7rem 0.85rem;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
  color: var(--text);
}
tbody tr { transition: background 90ms ease; }
tbody tr:hover { background: var(--surface-2); }
tbody tr:last-child td { border-bottom: none; }
.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}
.muted { color: var(--text-muted); }
.empty {
  padding: 2rem;
  text-align: center;
  color: var(--text-muted);
}

/* ---- Badges -------------------------------------------------------------- */

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: capitalize;
  letter-spacing: 0.01em;
  line-height: 1.4;
  border: 1px solid transparent;
  white-space: nowrap;
}
.badge-active,
.badge-accepted,
.badge-registered,
.badge-completed {
  background: var(--success-bg);
  color: var(--success);
  border-color: var(--success-border);
}
.badge-paused,
.badge-tentative,
.badge-draft,
.badge-invited,
.badge-queued {
  background: var(--warning-bg);
  color: var(--warning);
  border-color: var(--warning-border);
}
.badge-flagged,
.badge-needs_reauth,
.badge-failed,
.badge-declined,
.badge-archived {
  background: var(--danger-bg);
  color: var(--danger);
  border-color: var(--danger-border);
}
.badge-info {
  background: var(--info-bg);
  color: var(--info);
  border-color: var(--info-border);
}
.badge-warning {
  background: var(--warning-bg);
  color: var(--warning);
  border-color: var(--warning-border);
}

/* ---- Buttons ------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  padding: 0.5rem 0.95rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  line-height: 1.25;
  transition: background 120ms ease, border-color 120ms ease,
              transform 80ms ease, box-shadow 120ms ease;
  white-space: nowrap;
}
.btn:hover {
  background: #232c44;
  border-color: var(--border-strong);
  color: var(--text);
}
.btn:active { transform: translateY(1px); }
.btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--focus-ring);
}
.btn-primary {
  background: linear-gradient(180deg, #7997ff 0%, var(--primary) 100%);
  border-color: var(--primary-dark);
  color: #ffffff;
}
.btn-primary:hover {
  background: linear-gradient(180deg, #8aa6ff 0%, #6383f6 100%);
  border-color: var(--primary-dark);
  color: #ffffff;
}
.btn-danger {
  background: linear-gradient(180deg, #fa8d8d 0%, var(--danger) 100%);
  border-color: #d95252;
  color: #2a0a0a;
}
.btn-danger:hover {
  background: linear-gradient(180deg, #ff9b9b 0%, #f86161 100%);
  color: #2a0a0a;
}
.btn:disabled, .btn[disabled],
.btn.is-disabled, .btn[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  pointer-events: none;
}
/* Re-enable hover targeting for the tooltip on disabled anchors. */
.btn.is-disabled[title], .btn[aria-disabled="true"][title] {
  pointer-events: auto;
}
.btn.is-disabled[title]:hover, .btn[aria-disabled="true"][title]:hover {
  background: var(--surface-2);
  border-color: var(--border);
  color: var(--text);
}
.btn-sm { padding: 0.3rem 0.6rem; font-size: 0.78rem; }
.btn-row { display: flex; gap: 0.5rem; flex-wrap: wrap; }

/* ---- Forms --------------------------------------------------------------- */

.form-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}
.field { display: flex; flex-direction: column; gap: 0.35rem; }
.field.full { grid-column: 1 / -1; }
label {
  font-weight: 600;
  font-size: 0.8rem;
  color: var(--text);
  letter-spacing: 0.005em;
}
input, select, textarea {
  font: inherit;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, 0.25);
  color: var(--text);
  width: 100%;
  transition: border-color 120ms ease, box-shadow 120ms ease, background 120ms ease;
}
input::placeholder, textarea::placeholder {
  color: var(--text-faint);
}
input:hover, select:hover, textarea:hover {
  border-color: rgba(255, 255, 255, 0.22);
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--primary);
  background: rgba(0, 0, 0, 0.35);
  box-shadow: 0 0 0 3px var(--focus-ring);
}
input[type="file"] {
  padding: 0.4rem;
  cursor: pointer;
}
textarea { resize: vertical; min-height: 96px; line-height: 1.5; }
.hint { color: var(--text-muted); font-size: 0.78rem; }

/* ---- Progress bar -------------------------------------------------------- */

.progress {
  background: rgba(255, 255, 255, 0.06);
  border-radius: 999px;
  height: 8px;
  overflow: hidden;
  min-width: 90px;
}
.progress > span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--primary) 0%, #8fa8ff 100%);
  transition: width 240ms ease;
}

/* ---- Alerts -------------------------------------------------------------- */

.alert {
  border-radius: var(--radius-sm);
  padding: 0.75rem 0.95rem;
  margin-bottom: 0.7rem;
  border: 1px solid transparent;
  font-size: 0.88rem;
  line-height: 1.5;
}
.alert-error {
  background: var(--danger-bg);
  border-color: var(--danger-border);
  color: #ffb4b4;
}
.alert-warning {
  background: var(--warning-bg);
  border-color: var(--warning-border);
  color: #ffd97a;
}
.alert-success {
  background: var(--success-bg);
  border-color: var(--success-border);
  color: #7fe4bf;
}
.alert-info {
  background: var(--info-bg);
  border-color: var(--info-border);
  color: #a3c8ff;
}
.alert a { color: inherit; text-decoration: underline; }

#flash { margin-bottom: 1rem; }

/* ---- Login --------------------------------------------------------------- */

.login-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(800px 500px at 50% -10%, rgba(108, 142, 255, 0.15), transparent 60%),
    var(--bg);
  padding: 1.5rem;
}
.login-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 2.25rem;
  width: 380px;
  max-width: 100%;
}
.login-card h1 { text-align: center; margin-bottom: 1.25rem; }
.login-card .field { margin-bottom: 1rem; }

/* ---- Misc ---------------------------------------------------------------- */

.section-title {
  margin: 1.5rem 0 0.5rem;
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  font-weight: 600;
}
code {
  background: rgba(255, 255, 255, 0.06);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  font-size: 0.85em;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  color: #cbd2e0;
  border: 1px solid var(--border);
}
.steps { padding-left: 1.2rem; }
.steps li { margin-bottom: 0.5rem; }
.kv { display: grid; grid-template-columns: 160px 1fr; gap: 0.5rem 1rem; }
.kv dt { color: var(--text-muted); font-weight: 600; }
.kv dd { margin: 0; color: var(--text); }

/* Scrollbars - tasteful dark variants in WebKit / Firefox */
* { scrollbar-color: rgba(255, 255, 255, 0.18) transparent; scrollbar-width: thin; }
*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-track { background: transparent; }
*::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.10);
  border-radius: 999px;
  border: 2px solid transparent;
  background-clip: padding-box;
}
*::-webkit-scrollbar-thumb:hover { background: rgba(255, 255, 255, 0.20); background-clip: padding-box; border: 2px solid transparent; }