/* ═══════════════════════════════════════════════
   SimHosting Design System v2 — Premium UI
   Light/Dark Mode via CSS Variables
   ═══════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

/* ─── CSS Variables ─── */
:root {
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --radius: 14px;
  --radius-sm: 10px;
  --radius-xs: 6px;
  --shadow: 0 1px 2px rgba(0,0,0,0.04), 0 2px 8px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08), 0 1px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);

  /* Light mode (default) */
  --bg: #f5f6fa;
  --bg-card: #ffffff;
  --bg-sidebar: #ffffff;
  --bg-input: #f0f2f5;
  --bg-hover: #f0f2f5;
  --bg-active: #eef0ff;
  --border: #e2e5ea;
  --border-focus: #6366f1;
  --text: #0f172a;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-light: #eef2ff;
  --primary-gradient: linear-gradient(135deg, #6366f1, #8b5cf6);
  --success: #10b981;
  --success-light: #ecfdf5;
  --warning: #f59e0b;
  --warning-light: #fffbeb;
  --danger: #ef4444;
  --danger-light: #fef2f2;
  --info: #3b82f6;
  --info-light: #eff6ff;
  --sidebar-w: 264px;
  --topbar-h: 68px;
}

[data-theme="dark"] {
  --bg: #0c0d14;
  --bg-card: #14161f;
  --bg-sidebar: #10121a;
  --bg-input: #1c1f2e;
  --bg-hover: #1c1f2e;
  --bg-active: #1e2136;
  --border: #1e2030;
  --border-focus: #818cf8;
  --text: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #475569;
  --primary: #818cf8;
  --primary-hover: #6366f1;
  --primary-light: rgba(99,102,241,0.12);
  --primary-gradient: linear-gradient(135deg, #818cf8, #a78bfa);
  --success: #34d399;
  --success-light: rgba(16,185,129,0.12);
  --warning: #fbbf24;
  --warning-light: rgba(245,158,11,0.12);
  --danger: #f87171;
  --danger-light: rgba(239,68,68,0.12);
  --info: #60a5fa;
  --info-light: rgba(59,130,246,0.12);
  --shadow: 0 1px 3px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.5);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.6);
}

/* ─── Base Reset ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 15px; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-hover); }
img { max-width: 100%; display: block; }

::selection {
  background: rgba(99,102,241,0.2);
  color: var(--text);
}

/* ─── Scrollbar ─── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ─── Layout: Sidebar + Main ─── */
.app-layout {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: var(--sidebar-w);
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  position: fixed;
  top: 0; left: 0; bottom: 0;
  display: flex;
  flex-direction: column;
  z-index: 40;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  overflow: hidden;
}

.sidebar-brand {
  padding: 20px 22px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.sidebar-brand .logo {
  width: 38px; height: 38px;
  background: var(--primary-gradient);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  font-size: 15px;
  flex-shrink: 0;
}

.sidebar-brand h1 {
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 16px 12px;
}

.nav-section {
  margin-bottom: 26px;
}

.nav-section-title {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  padding: 0 12px 8px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  transition: all var(--transition);
  margin-bottom: 2px;
  position: relative;
}

.nav-link:hover {
  background: var(--bg-hover);
  color: var(--text);
}

.nav-link.active {
  background: var(--primary-light);
  color: var(--primary);
  font-weight: 600;
}

.nav-link.active::before {
  content: '';
  position: absolute;
  left: 0; top: 8px; bottom: 8px;
  width: 3px;
  background: var(--primary);
  border-radius: 0 3px 3px 0;
}

.nav-link svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  opacity: 0.65;
}

.nav-link:hover svg { opacity: 0.85; }
.nav-link.active svg { opacity: 1; }

.sidebar-footer {
  padding: 14px 16px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.main-content {
  flex: 1;
  margin-left: var(--sidebar-w);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ─── Top Bar ─── */
.topbar {
  height: var(--topbar-h);
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  position: sticky;
  top: 0;
  z-index: 30;
  backdrop-filter: blur(10px);
  background: color-mix(in srgb, var(--bg-card) 85%, transparent);
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.topbar-title {
  font-size: 18px;
  font-weight: 700;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn-icon {
  width: 40px; height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
}

.btn-icon:hover {
  background: var(--bg-hover);
  color: var(--text);
  border-color: var(--text-muted);
}

.user-menu {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 5px 14px 5px 5px;
  border-radius: 50px;
  cursor: pointer;
  border: 1px solid var(--border);
  transition: all var(--transition);
}

.user-menu:hover {
  background: var(--bg-hover);
  border-color: var(--text-muted);
}

.user-avatar {
  width: 34px; height: 34px;
  border-radius: 50%;
  background: var(--primary-gradient);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 13px;
}

.user-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}

/* ─── Page Content ─── */
.page-content {
  flex: 1;
  padding: 28px;
}

/* ─── Cards ─── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.card-header {
  padding: 18px 24px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-header h3 {
  font-size: 15px;
  font-weight: 700;
}

.card-body { padding: 24px; }

/* ─── Stat Cards Grid ─── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 18px;
  margin-bottom: 26px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.stat-card::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--primary-gradient);
  opacity: 0;
  transition: opacity var(--transition);
}

.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.stat-card:hover::after { opacity: 1; }

.stat-card .stat-label {
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 600;
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.stat-card .stat-value {
  font-size: 28px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.02em;
}

.stat-card .stat-change {
  font-size: 12px;
  margin-top: 8px;
  font-weight: 600;
}

.stat-change.up { color: var(--success); }
.stat-change.down { color: var(--danger); }

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  line-height: 1;
  white-space: nowrap;
}

.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--primary-gradient);
  color: #fff;
  box-shadow: 0 2px 8px rgba(99,102,241,0.25);
}
.btn-primary:hover {
  filter: brightness(1.1);
  box-shadow: 0 4px 16px rgba(99,102,241,0.35);
  color: #fff;
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover {
  background: var(--bg-hover);
  border-color: var(--text-muted);
  color: var(--text);
}

.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #dc2626; color: #fff; }

.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { background: #059669; color: #fff; }

.btn-sm {
  padding: 7px 14px;
  font-size: 13px;
  border-radius: var(--radius-xs);
}

.btn-lg {
  padding: 14px 30px;
  font-size: 16px;
}

.btn-block { width: 100%; }

/* ─── Form Elements ─── */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 11px 16px;
  font-family: var(--font);
  font-size: 14px;
  color: var(--text);
  background: var(--bg-input);
  border: 1.5px solid transparent;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  outline: none;
}

.form-input:hover,
.form-select:hover,
.form-textarea:hover {
  border-color: var(--border);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--border-focus);
  background: var(--bg-card);
  box-shadow: 0 0 0 4px rgba(99,102,241,0.1);
}

.form-input::placeholder { color: var(--text-muted); }
.form-textarea { resize: vertical; min-height: 100px; }

.form-error {
  font-size: 12px;
  color: var(--danger);
  margin-top: 5px;
  font-weight: 500;
}

.form-hint {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 5px;
}

/* ─── Radio Cards (SIM choice) ─── */
.radio-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.radio-card {
  position: relative;
  padding: 22px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
}

.radio-card:hover { border-color: var(--text-muted); }
.radio-card input { position: absolute; opacity: 0; pointer-events: none; }

.radio-card.selected,
.radio-card:has(input:checked) {
  border-color: var(--primary);
  background: var(--primary-light);
  box-shadow: 0 0 0 4px rgba(99,102,241,0.08);
}

.radio-card-icon {
  width: 48px; height: 48px;
  border-radius: var(--radius-sm);
  background: var(--bg-input);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
  font-size: 24px;
}

.radio-card-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}

.radio-card-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ─── Alerts / Flash ─── */
.alert {
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 10px;
  animation: slideDown 0.3s ease;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

.alert-success { background: var(--success-light); color: var(--success); border: 1px solid color-mix(in srgb, var(--success) 20%, transparent); }
.alert-error   { background: var(--danger-light);  color: var(--danger);  border: 1px solid color-mix(in srgb, var(--danger) 20%, transparent); }
.alert-warning { background: var(--warning-light); color: var(--warning); border: 1px solid color-mix(in srgb, var(--warning) 20%, transparent); }
.alert-info    { background: var(--info-light);    color: var(--info);    border: 1px solid color-mix(in srgb, var(--info) 20%, transparent); }

/* ─── Tables ─── */
.table-wrap { overflow-x: auto; }

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.table th {
  text-align: left;
  padding: 13px 18px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  background: var(--bg-input);
}

.table td {
  padding: 15px 18px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}

.table tbody tr {
  transition: background var(--transition);
}

.table tbody tr:hover {
  background: var(--bg-hover);
}

.table tbody tr:last-child td {
  border-bottom: none;
}

/* ─── Badges ─── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.badge-success { background: var(--success-light); color: var(--success); }
.badge-danger  { background: var(--danger-light);  color: var(--danger); }
.badge-warning { background: var(--warning-light); color: var(--warning); }
.badge-info    { background: var(--info-light);    color: var(--info); }
.badge-neutral { background: var(--bg-input);      color: var(--text-secondary); }

/* ─── Auth Pages ─── */
.auth-layout {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: var(--bg);
}

.auth-card {
  width: 100%;
  max-width: 440px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow-lg);
  padding: 40px;
}

.auth-logo {
  text-align: center;
  margin-bottom: 32px;
}

.auth-logo .logo-mark {
  width: 56px; height: 56px;
  background: var(--primary-gradient);
  border-radius: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  font-size: 22px;
  margin-bottom: 16px;
  box-shadow: 0 4px 20px rgba(99,102,241,0.3);
}

.auth-logo h2 {
  font-size: 24px;
  font-weight: 800;
  color: var(--text);
}

.auth-logo p {
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 6px;
}

.auth-footer {
  text-align: center;
  margin-top: 24px;
  font-size: 14px;
  color: var(--text-secondary);
}

.auth-footer a {
  font-weight: 600;
}

/* ─── Empty State ─── */
.empty-state {
  text-align: center;
  padding: 56px 24px;
  color: var(--text-secondary);
}

.empty-state-icon {
  font-size: 52px;
  margin-bottom: 16px;
  opacity: 0.5;
}

.empty-state h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.empty-state p {
  font-size: 14px;
  max-width: 360px;
  margin: 0 auto 20px;
  line-height: 1.6;
}

/* ─── Mobile Sidebar Toggle ─── */
.sidebar-toggle {
  display: none;
  width: 40px; height: 40px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  color: var(--text);
  cursor: pointer;
  font-size: 20px;
}

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  z-index: 35;
}

/* ─── Theme Toggle ─── */
.theme-toggle {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 50px;
  padding: 3px;
  display: flex;
  gap: 2px;
}

.theme-toggle button {
  padding: 7px 14px;
  border: none;
  border-radius: 50px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 14px;
  transition: all var(--transition);
  font-family: var(--font);
}

.theme-toggle button.active {
  background: var(--bg-card);
  color: var(--text);
  box-shadow: var(--shadow);
}

/* ─── Responsive ─── */
@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .sidebar-overlay.show { display: block; }
  .sidebar-toggle { display: flex; }
  .main-content { margin-left: 0; }
  .radio-cards { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .page-content { padding: 18px; }
  .topbar { padding: 0 18px; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr; }
  .auth-card { padding: 28px; }
}

/* ─── Animations ─── */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in { animation: fadeIn 0.4s ease; }

/* ─── Loading Spinner ─── */
.spinner {
  width: 20px; height: 20px;
  border: 2.5px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.btn .spinner {
  width: 16px; height: 16px;
  border-width: 2px;
  border-color: rgba(255,255,255,0.3);
  border-top-color: #fff;
}

/* ─── Password Strength ─── */
.password-strength {
  height: 4px;
  border-radius: 3px;
  background: var(--bg-input);
  margin-top: 8px;
  overflow: hidden;
}

.password-strength-bar {
  height: 100%;
  border-radius: 3px;
  transition: width 0.3s, background 0.3s;
}