/* Payment Gateway - Shared Styles */
:root {
  --bg: #07070c;
  --bg-elevated: #0e0e14;
  --bg-card: rgba(18, 18, 26, 0.8);
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --accent: #06b6d4;
  --accent-hover: #22d3ee;
  --accent-glow: rgba(6, 182, 212, 0.25);
  --border: rgba(148, 163, 184, 0.1);
  --radius: 14px;
  --radius-lg: 24px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 24px 48px rgba(0, 0, 0, 0.5);
  --font-head: 'Outfit', system-ui, sans-serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: 
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(6, 182, 212, 0.08), transparent),
    radial-gradient(ellipse 60% 40% at 100% 50%, rgba(6, 182, 212, 0.04), transparent),
    radial-gradient(ellipse 60% 40% at 0% 80%, rgba(6, 182, 212, 0.03), transparent);
  pointer-events: none;
  z-index: 0;
}

h1, h2, h3 {
  font-family: var(--font-head);
  font-weight: 600;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}
a:hover {
  color: var(--accent-hover);
}

/* Nav */
.nav {
  position: relative;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem clamp(1rem, 4vw, 2rem);
  max-width: 1200px;
  margin: 0 auto;
  background: rgba(7, 7, 12, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

@media (max-width: 640px) {
  .nav-links { gap: 1rem; }
  .nav-links .btn { padding: 0.5rem 1rem; font-size: 0.875rem; }
}

.nav-brand {
  font-family: var(--font-head);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.95rem;
  transition: color 0.2s;
}
.nav-links a:hover {
  color: var(--text);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.5rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent) 0%, #0891b2 100%);
  color: var(--bg);
  box-shadow: 0 2px 12px var(--accent-glow);
}
.btn-primary:hover {
  background: linear-gradient(135deg, var(--accent-hover) 0%, var(--accent) 100%);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--accent-glow);
}

.btn-ghost {
  background: rgba(148, 163, 184, 0.06);
  color: var(--text-muted);
  border: 1px solid var(--border);
}
.btn-ghost:hover {
  color: var(--text);
  border-color: rgba(148, 163, 184, 0.25);
  background: rgba(148, 163, 184, 0.1);
}

/* Form */
.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--text-muted);
}

.form-group input {
  width: 100%;
  padding: 0.85rem 1rem;
  font-size: 1rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-group input::placeholder {
  color: var(--text-muted);
  opacity: 0.6;
}

.form-footer {
  margin-top: 1.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
  text-align: center;
}

.form-footer a {
  font-weight: 500;
}

/* Auth pages */
.auth-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  position: relative;
  z-index: 1;
}

.auth-card {
  width: 100%;
  max-width: 420px;
  padding: 2.5rem;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  animation: fadeUp 0.5s ease-out;
}

.auth-card h1 {
  font-size: 1.55rem;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.auth-card .subtitle {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 2rem;
}

.auth-card .btn {
  width: 100%;
  padding: 0.9rem;
  margin-top: 0.25rem;
}

.auth-card .back {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 1.5rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  transition: color 0.2s;
}

.auth-card .back:hover {
  color: var(--text);
}

.alert-error {
  padding: 0.85rem 1rem;
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.25);
  border-radius: var(--radius);
  margin-bottom: 1.25rem;
  color: #f87171;
  font-size: 0.9rem;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}