/* ================================================================
   Student Payment Validation Workflow — Shared Design System
   Dark glassmorphism theme, premium typography, micro-animations
   ================================================================ */

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

/* ── Design Tokens ─────────────────────────────────────────── */
:root {
  /* Colors */
  --clr-bg:          #0a0e1a;
  --clr-bg-2:        #0f1525;
  --clr-surface:     rgba(255,255,255,0.05);
  --clr-surface-2:   rgba(255,255,255,0.08);
  --clr-border:      rgba(255,255,255,0.10);
  --clr-border-2:    rgba(255,255,255,0.16);

  --clr-primary:     #6366f1;   /* indigo */
  --clr-primary-light: #818cf8;
  --clr-primary-dark:  #4f46e5;
  --clr-accent:      #22d3ee;   /* cyan */
  --clr-accent-2:    #a78bfa;   /* violet */
  --clr-success:     #10b981;
  --clr-warning:     #f59e0b;
  --clr-danger:      #ef4444;
  --clr-info:        #3b82f6;

  --clr-text:        #f1f5f9;
  --clr-text-2:      #94a3b8;
  --clr-text-3:      #64748b;

  /* Gradients */
  --grad-primary:   linear-gradient(135deg, #6366f1 0%, #a78bfa 100%);
  --grad-accent:    linear-gradient(135deg, #22d3ee 0%, #6366f1 100%);
  --grad-danger:    linear-gradient(135deg, #ef4444 0%, #f97316 100%);
  --grad-success:   linear-gradient(135deg, #10b981 0%, #22d3ee 100%);
  --grad-bg:        linear-gradient(135deg, #0a0e1a 0%, #0f1525 50%, #0a0e1a 100%);

  /* Glow effects */
  --glow-primary:   0 0 40px rgba(99,102,241,0.30);
  --glow-accent:    0 0 40px rgba(34,211,238,0.20);
  --glow-success:   0 0 30px rgba(16,185,129,0.25);
  --glow-danger:    0 0 30px rgba(239,68,68,0.25);

  /* Shadows */
  --shadow-sm:  0 2px 8px rgba(0,0,0,0.30);
  --shadow-md:  0 8px 24px rgba(0,0,0,0.40);
  --shadow-lg:  0 20px 60px rgba(0,0,0,0.60);
  --shadow-card: 0 4px 20px rgba(0,0,0,0.35);

  /* Radii */
  --radius-sm:  8px;
  --radius-md:  12px;
  --radius-lg:  20px;
  --radius-xl:  28px;
  --radius-full: 9999px;

  /* Spacing */
  --space-xs:  4px;
  --space-sm:  8px;
  --space-md:  16px;
  --space-lg:  24px;
  --space-xl:  32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --transition: 0.25s var(--ease-in-out);
}

/* ── Reset ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--clr-bg);
  color: var(--clr-text);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}
img, video { display: block; max-width: 100%; }
button { cursor: pointer; font-family: inherit; }
input, select, textarea { font-family: inherit; }
a { color: inherit; text-decoration: none; }

/* ── Scrollbar ─────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--clr-bg-2); }
::-webkit-scrollbar-thumb { background: var(--clr-primary); border-radius: var(--radius-full); }

/* ── Background mesh ───────────────────────────────────────── */
.bg-mesh {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(ellipse 70% 50% at 10% 20%, rgba(99,102,241,0.12) 0%, transparent 60%),
    radial-gradient(ellipse 50% 60% at 90% 80%, rgba(34,211,238,0.08) 0%, transparent 60%),
    radial-gradient(ellipse 40% 40% at 50% 50%, rgba(167,139,250,0.05) 0%, transparent 60%);
}

/* ── Card / Glass ──────────────────────────────────────────── */
.card {
  background: var(--clr-surface);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.card:hover { border-color: var(--clr-border-2); }

.card-elevated {
  background: var(--clr-surface-2);
  border: 1px solid var(--clr-border-2);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

/* ── Buttons ───────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-sm);
  padding: 12px 24px;
  border: none; border-radius: var(--radius-md);
  font-size: 0.9rem; font-weight: 600; letter-spacing: 0.01em;
  transition: all var(--transition);
  position: relative; overflow: hidden;
  white-space: nowrap;
}
.btn::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(rgba(255,255,255,0.08), rgba(255,255,255,0));
  opacity: 0; transition: opacity var(--transition);
}
.btn:hover::after { opacity: 1; }

.btn-primary {
  background: var(--grad-primary);
  color: #fff;
  box-shadow: 0 4px 20px rgba(99,102,241,0.40);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(99,102,241,0.55);
}
.btn-primary:active { transform: translateY(0); }

.btn-accent {
  background: var(--grad-accent);
  color: #fff;
  box-shadow: 0 4px 20px rgba(34,211,238,0.30);
}
.btn-accent:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(34,211,238,0.45); }

.btn-success {
  background: var(--grad-success);
  color: #fff;
  box-shadow: 0 4px 15px rgba(16,185,129,0.35);
}
.btn-success:hover { transform: translateY(-2px); }

.btn-danger {
  background: var(--grad-danger);
  color: #fff;
  box-shadow: 0 4px 15px rgba(239,68,68,0.35);
}
.btn-danger:hover { transform: translateY(-2px); }

.btn-ghost {
  background: transparent;
  color: var(--clr-text-2);
  border: 1px solid var(--clr-border-2);
}
.btn-ghost:hover { background: var(--clr-surface-2); color: var(--clr-text); }

.btn-sm { padding: 8px 16px; font-size: 0.8rem; border-radius: var(--radius-sm); }
.btn-lg { padding: 16px 36px; font-size: 1rem; border-radius: var(--radius-md); }

.btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none !important; }

/* ── Form Elements ─────────────────────────────────────────── */
.form-group { display: flex; flex-direction: column; gap: var(--space-xs); }

.form-label {
  font-size: 0.82rem; font-weight: 600;
  color: var(--clr-text-2);
  letter-spacing: 0.04em; text-transform: uppercase;
}

.form-control {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  color: var(--clr-text);
  font-size: 0.95rem;
  padding: 12px 16px;
  transition: all var(--transition);
  outline: none;
  width: 100%;
}
.form-control::placeholder { color: var(--clr-text-3); }
.form-control:focus {
  border-color: var(--clr-primary);
  background: rgba(99,102,241,0.06);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
}
.form-control.is-valid { border-color: var(--clr-success); }
.form-control.is-invalid { border-color: var(--clr-danger); }

.form-hint { font-size: 0.78rem; color: var(--clr-text-3); margin-top: 2px; }
.form-error { font-size: 0.78rem; color: var(--clr-danger); margin-top: 2px; display: none; }
.form-control.is-invalid + .form-error { display: block; }

/* ── Badges / Status ───────────────────────────────────────── */
.badge {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 4px 10px; border-radius: var(--radius-full);
  font-size: 0.72rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase;
}
.badge::before { content: ''; width: 6px; height: 6px; border-radius: 50%; }

.badge-success { background: rgba(16,185,129,0.15); color: #10b981; }
.badge-success::before { background: #10b981; box-shadow: 0 0 6px #10b981; }

.badge-warning { background: rgba(245,158,11,0.15); color: #f59e0b; }
.badge-warning::before { background: #f59e0b; }

.badge-danger  { background: rgba(239,68,68,0.15); color: #ef4444; }
.badge-danger::before  { background: #ef4444; }

.badge-info    { background: rgba(99,102,241,0.15); color: #818cf8; }
.badge-info::before    { background: #818cf8; }

.badge-neutral { background: rgba(100,116,139,0.15); color: #94a3b8; }
.badge-neutral::before { background: #94a3b8; }

/* ── Stat Cards ────────────────────────────────────────────── */
.stat-card {
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  position: relative; overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}
.stat-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.stat-card .stat-icon {
  width: 48px; height: 48px; border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem; margin-bottom: var(--space-md);
}
.stat-card .stat-value {
  font-size: 2rem; font-weight: 800; line-height: 1;
  margin-bottom: 4px;
}
.stat-card .stat-label {
  font-size: 0.8rem; font-weight: 500; color: var(--clr-text-2);
  text-transform: uppercase; letter-spacing: 0.05em;
}
.stat-card .stat-change {
  font-size: 0.75rem; margin-top: 8px; opacity: 0.8;
}

/* ── Tables ────────────────────────────────────────────────── */
.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--clr-border);
}
.data-table {
  width: 100%; border-collapse: collapse;
  font-size: 0.875rem;
}
.data-table thead {
  background: rgba(99,102,241,0.08);
  border-bottom: 1px solid var(--clr-border);
}
.data-table th {
  padding: 12px 16px; text-align: left;
  font-size: 0.75rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--clr-text-2); white-space: nowrap;
}
.data-table td {
  padding: 14px 16px; border-bottom: 1px solid rgba(255,255,255,0.04);
  color: var(--clr-text); vertical-align: middle;
}
.data-table tbody tr:last-child td { border-bottom: none; }
.data-table tbody tr {
  transition: background var(--transition);
}
.data-table tbody tr:hover { background: var(--clr-surface-2); }

/* ── Alerts ────────────────────────────────────────────────── */
.alert {
  padding: 16px 20px; border-radius: var(--radius-md);
  border-left: 4px solid; font-size: 0.9rem;
  display: flex; align-items: flex-start; gap: 12px;
}
.alert-icon { font-size: 1.1rem; flex-shrink: 0; margin-top: 1px; }
.alert-success { background: rgba(16,185,129,0.10); border-color: var(--clr-success); color: #6ee7b7; }
.alert-error   { background: rgba(239,68,68,0.10);  border-color: var(--clr-danger);  color: #fca5a5; }
.alert-warning { background: rgba(245,158,11,0.10); border-color: var(--clr-warning); color: #fcd34d; }
.alert-info    { background: rgba(99,102,241,0.10); border-color: var(--clr-primary); color: #a5b4fc; }

/* ── Loading Spinner ───────────────────────────────────────── */
.spinner {
  width: 20px; height: 20px;
  border: 2px solid rgba(255,255,255,0.2);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Toast notifications ───────────────────────────────────── */
.toast-container {
  position: fixed; top: 24px; right: 24px; z-index: 9999;
  display: flex; flex-direction: column; gap: 10px;
  pointer-events: none;
}
.toast {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 20px; border-radius: var(--radius-md);
  background: var(--clr-surface-2);
  backdrop-filter: blur(20px);
  border: 1px solid var(--clr-border-2);
  box-shadow: var(--shadow-lg);
  font-size: 0.875rem; font-weight: 500;
  pointer-events: all;
  animation: slideIn 0.4s var(--ease-out);
  max-width: 360px;
}
.toast.hide { animation: slideOut 0.3s var(--ease-in-out) forwards; }
@keyframes slideIn {
  from { transform: translateX(120%); opacity: 0; }
  to   { transform: translateX(0);    opacity: 1; }
}
@keyframes slideOut {
  to { transform: translateX(120%); opacity: 0; }
}
.toast-success { border-left: 3px solid var(--clr-success); }
.toast-error   { border-left: 3px solid var(--clr-danger); }
.toast-info    { border-left: 3px solid var(--clr-primary); }

/* ── Utilities ─────────────────────────────────────────────── */
.flex { display: flex; }
.flex-col { display: flex; flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }
.text-center { text-align: center; }
.text-sm { font-size: 0.875rem; }
.text-xs { font-size: 0.75rem; }
.text-muted { color: var(--clr-text-2); }
.font-mono { font-family: var(--font-mono); }
.font-bold { font-weight: 700; }
.w-full { width: 100%; }
.hidden { display: none !important; }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }

/* gradient text */
.text-gradient {
  background: var(--grad-primary);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.text-gradient-accent {
  background: var(--grad-accent);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ── Print styles (shared base) ────────────────────────────── */
@media print {
  .no-print { display: none !important; }
  body { background: #fff; color: #000; }
}