/* ================================================
   UPI Payment Gateway - Main Stylesheet
   Bootstrap 5 + Custom Premium Design System
   ================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
  --primary:       #6366f1;
  --primary-dark:  #4f46e5;
  --primary-light: #a5b4fc;
  --secondary:     #0ea5e9;
  --success:       #22c55e;
  --warning:       #f59e0b;
  --danger:        #ef4444;
  --dark:          #0f172a;
  --dark-card:     #1e293b;
  --dark-border:   #334155;
  --text-muted:    #94a3b8;
  --text-light:    #cbd5e1;
  --radius:        12px;
  --radius-lg:     20px;
  --shadow:        0 4px 24px rgba(0,0,0,0.35);
  --shadow-sm:     0 2px 8px rgba(0,0,0,0.2);
  --transition:    all 0.25s cubic-bezier(.4,0,.2,1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Inter', sans-serif;
  background: var(--dark);
  color: #e2e8f0;
  min-height: 100vh;
  line-height: 1.6;
}

/* ── Typography ─────────────────────────────── */
h1,h2,h3,h4,h5,h6 { font-weight: 700; color: #f1f5f9; }
.text-gradient {
  background: linear-gradient(135deg, var(--primary-light), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

.sidebar {
  width: 260px;
  min-height: 100vh;
  background: linear-gradient(160deg, #1a1f35 0%, #0f172a 100%);
  border-right: 1px solid var(--dark-border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0;
  z-index: 100;
  transition: var(--transition);
}

.sidebar-brand {
  padding: 24px 20px;
  border-bottom: 1px solid var(--dark-border);
}
.sidebar-brand h5 {
  font-size: 1.1rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary-light), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.sidebar-nav { flex: 1; padding: 16px 0; overflow-y: auto; }
.nav-item { list-style: none; }
.nav-link-side {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 20px;
  color: var(--text-light);
  text-decoration: none;
  border-radius: 0;
  font-size: 0.875rem;
  font-weight: 500;
  transition: var(--transition);
  border-left: 3px solid transparent;
}
.nav-link-side:hover, .nav-link-side.active {
  color: #fff;
  background: rgba(99,102,241,0.15);
  border-left-color: var(--primary);
}
.nav-link-side i { width: 20px; text-align: center; font-size: 1rem; }

.sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--dark-border);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ── Main Content ───────────────────────────── */
.main-content {
  margin-left: 260px;
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.topbar {
  background: var(--dark-card);
  border-bottom: 1px solid var(--dark-border);
  padding: 16px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 50;
}

.page-content { padding: 32px; flex: 1; }

/* ── Cards ──────────────────────────────────── */
.card-dark {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}
.card-dark:hover { box-shadow: var(--shadow); transform: translateY(-2px); }
.card-dark .card-header {
  background: rgba(255,255,255,0.03);
  border-bottom: 1px solid var(--dark-border);
  padding: 16px 20px;
  font-weight: 600;
}
.card-dark .card-body { padding: 20px; }

/* ── Stat Cards ─────────────────────────────── */
.stat-card {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}
.stat-card::before {
  content: '';
  position: absolute;
  top: 0; right: 0;
  width: 80px; height: 80px;
  border-radius: 0 0 0 80px;
  opacity: 0.15;
}
.stat-card.primary::before  { background: var(--primary); }
.stat-card.success::before  { background: var(--success); }
.stat-card.warning::before  { background: var(--warning); }
.stat-card.secondary::before{ background: var(--secondary); }
.stat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }

.stat-icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 16px;
}
.stat-icon.primary  { background: rgba(99,102,241,0.2); color: var(--primary-light); }
.stat-icon.success  { background: rgba(34,197,94,0.2); color: #86efac; }
.stat-icon.warning  { background: rgba(245,158,11,0.2); color: #fcd34d; }
.stat-icon.secondary{ background: rgba(14,165,233,0.2); color: #7dd3fc; }

.stat-value { font-size: 2rem; font-weight: 800; color: #f1f5f9; line-height: 1; }
.stat-label { font-size: 0.8rem; color: var(--text-muted); margin-top: 4px; text-transform: uppercase; letter-spacing: 0.05em; }

/* ── Buttons ────────────────────────────────── */
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border: none;
  color: #fff;
  padding: 10px 24px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  transition: var(--transition);
  cursor: pointer;
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 8px 24px rgba(99,102,241,0.4); color: #fff; }

.btn-success-custom {
  background: linear-gradient(135deg, #22c55e, #16a34a);
  border: none; color: #fff;
  padding: 10px 24px; border-radius: 8px;
  font-weight: 600; font-size: 0.9rem;
  transition: var(--transition); cursor: pointer;
}
.btn-success-custom:hover { transform: translateY(-1px); box-shadow: 0 8px 24px rgba(34,197,94,0.4); color: #fff; }

.btn-danger-custom {
  background: linear-gradient(135deg, #ef4444, #dc2626);
  border: none; color: #fff;
  padding: 8px 16px; border-radius: 6px;
  font-weight: 500; font-size: 0.85rem;
  transition: var(--transition); cursor: pointer;
}
.btn-danger-custom:hover { transform: translateY(-1px); box-shadow: 0 4px 12px rgba(239,68,68,0.4); color: #fff; }

.btn-outline-light-custom {
  background: transparent;
  border: 1px solid var(--dark-border);
  color: var(--text-light);
  padding: 8px 16px; border-radius: 6px;
  font-weight: 500; font-size: 0.85rem;
  transition: var(--transition); cursor: pointer;
  text-decoration: none;
  display: inline-flex; align-items: center; gap: 6px;
}
.btn-outline-light-custom:hover { border-color: var(--primary-light); color: var(--primary-light); }

/* ── Form Controls ──────────────────────────── */
.form-control-dark {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--dark-border);
  color: #e2e8f0;
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 0.9rem;
  width: 100%;
  transition: var(--transition);
}
.form-control-dark:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.2);
  background: rgba(255,255,255,0.07);
  color: #fff;
}
.form-control-dark::placeholder { color: var(--text-muted); }

.form-label-dark { font-size: 0.85rem; font-weight: 500; color: var(--text-light); margin-bottom: 6px; display: block; }

/* ── Tables ─────────────────────────────────── */
.table-dark-custom {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}
.table-dark-custom th {
  background: rgba(255,255,255,0.04);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 12px 16px;
  border-bottom: 1px solid var(--dark-border);
}
.table-dark-custom td {
  padding: 12px 16px;
  border-bottom: 1px solid rgba(51,65,85,0.5);
  color: #cbd5e1;
  vertical-align: middle;
}
.table-dark-custom tr:hover td { background: rgba(255,255,255,0.02); }
.table-dark-custom tr:last-child td { border-bottom: none; }

/* ── Badges ─────────────────────────────────── */
.badge-status {
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.badge-success  { background: rgba(34,197,94,0.2); color: #86efac; }
.badge-pending  { background: rgba(245,158,11,0.2); color: #fcd34d; }
.badge-failed   { background: rgba(239,68,68,0.2);  color: #fca5a5; }
.badge-refunded { background: rgba(14,165,233,0.2); color: #7dd3fc; }
.badge-active   { background: rgba(34,197,94,0.2); color: #86efac; }
.badge-suspended{ background: rgba(239,68,68,0.2);  color: #fca5a5; }
.badge-inactive { background: rgba(245,158,11,0.2); color: #fcd34d; }

/* ── Auth Pages ─────────────────────────────── */
.auth-page {
  min-height: 100vh;
  background: linear-gradient(135deg, #0f172a 0%, #1a1f35 50%, #0f172a 100%);
  display: flex; align-items: center; justify-content: center;
  padding: 20px;
}
.auth-card {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius-lg);
  padding: 40px;
  width: 100%;
  max-width: 440px;
  box-shadow: 0 24px 64px rgba(0,0,0,0.5);
  animation: slideUp 0.4s ease;
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── UPI App Buttons ────────────────────────── */
.upi-apps { display: flex; gap: 12px; flex-wrap: wrap; }
.upi-app-btn {
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  padding: 12px 16px; border-radius: 12px;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--dark-border);
  text-decoration: none; color: var(--text-light);
  font-size: 0.75rem; font-weight: 500;
  transition: var(--transition); min-width: 80px;
}
.upi-app-btn:hover { background: rgba(99,102,241,0.15); border-color: var(--primary); color: #fff; transform: translateY(-2px); }
.upi-app-btn img { width: 36px; height: 36px; border-radius: 8px; }

/* ── QR Container ───────────────────────────── */
.qr-container {
  background: #fff;
  border-radius: 16px;
  padding: 16px;
  display: inline-block;
  box-shadow: 0 8px 32px rgba(99,102,241,0.3);
}
.qr-container img { display: block; width: 200px; height: 200px; }

/* ── Payment Amount Display ─────────────────── */
.amount-display {
  font-size: 2.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, #86efac, #22c55e);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── Alert overrides ────────────────────────── */
.alert-success { background: rgba(34,197,94,0.15); border-color: rgba(34,197,94,0.3); color: #86efac; }
.alert-danger  { background: rgba(239,68,68,0.15);  border-color: rgba(239,68,68,0.3);  color: #fca5a5; }
.alert-info    { background: rgba(14,165,233,0.15); border-color: rgba(14,165,233,0.3); color: #7dd3fc; }
.btn-close { filter: invert(1); }

/* ── Navbar (public pages) ──────────────────── */
.nav-public {
  background: rgba(15,23,42,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--dark-border);
  padding: 16px 0;
  position: sticky; top: 0; z-index: 200;
}

/* ── Hero Section ───────────────────────────── */
.hero {
  min-height: 100vh;
  background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #0c1a2e 100%);
  display: flex; align-items: center;
  position: relative; overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at 70% 50%, rgba(99,102,241,0.15) 0%, transparent 60%);
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(99,102,241,0.15);
  border: 1px solid rgba(99,102,241,0.3);
  color: var(--primary-light);
  padding: 6px 16px; border-radius: 20px;
  font-size: 0.8rem; font-weight: 600;
  margin-bottom: 24px;
}
.hero h1 { font-size: clamp(2rem, 5vw, 3.5rem); line-height: 1.15; }
.hero p { font-size: 1.1rem; color: var(--text-muted); max-width: 520px; }

.feature-card {
  background: rgba(30,41,59,0.7);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--transition);
  backdrop-filter: blur(8px);
}
.feature-card:hover { border-color: var(--primary); transform: translateY(-4px); }
.feature-icon {
  width: 52px; height: 52px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(99,102,241,0.3), rgba(14,165,233,0.3));
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 16px;
}

/* ── Scrollbar ──────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--dark); }
::-webkit-scrollbar-thumb { background: var(--dark-border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--primary); }

/* ── Responsive Sidebar ─────────────────────── */
@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .main-content { margin-left: 0; }
  .page-content { padding: 20px 16px; }
  .topbar { padding: 12px 16px; }
}

/* ── Loading spinner ─────────────────────────── */
.spinner-pulse {
  width: 48px; height: 48px;
  border-radius: 50%;
  border: 3px solid var(--dark-border);
  border-top-color: var(--primary);
  animation: spin 0.8s linear infinite;
  margin: 40px auto;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Transaction ID ─────────────────────────── */
.txn-id {
  font-family: 'Courier New', monospace;
  font-size: 0.8rem;
  color: var(--text-muted);
  background: rgba(255,255,255,0.05);
  padding: 2px 6px;
  border-radius: 4px;
}

/* ── Empty State ────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
}
.empty-state i { font-size: 3rem; margin-bottom: 16px; opacity: 0.4; }