/* ========================================
   Iterative Billing Hotspot Login Page
   Enterprise Design System
   Version: 3.0
   ======================================== */

/* ========================================
   CSS Variables - Design Tokens
   Matching Iterative Billing UI Standards
   ======================================== */
:root {
  /* Primary Colors - Brand */
  --primary-50: #eef2ff;
  --primary-100: #e0e7ff;
  --primary-200: #c7d2fe;
  --primary-300: #a5b4fc;
  --primary-400: #818cf8;
  --primary-500: #6366f1;
  --primary-600: #4f46e5;
  --primary-700: #4338ca;
  --primary-800: #3730a3;
  --primary-900: #312e81;

  /* Success Colors */
  --success-50: #ecfdf5;
  --success-100: #d1fae5;
  --success-400: #34d399;
  --success-500: #10b981;
  --success-600: #059669;

  /* Error Colors */
  --error-50: #fef2f2;
  --error-100: #fee2e2;
  --error-400: #f87171;
  --error-500: #ef4444;
  --error-600: #dc2626;

  /* Amber/Warning Colors */
  --amber-50: #fffbeb;
  --amber-100: #fef3c7;
  --amber-400: #fbbf24;
  --amber-500: #f59e0b;
  --amber-600: #d97706;

  /* Slate (Neutral) Colors */
  --slate-50: #f8fafc;
  --slate-100: #f1f5f9;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-400: #94a3b8;
  --slate-500: #64748b;
  --slate-600: #475569;
  --slate-700: #334155;
  --slate-800: #1e293b;
  --slate-900: #0f172a;
  --slate-950: #020617;

  /* Background Gradients */
  --bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #312e81 100%);
  --card-gradient: linear-gradient(145deg, rgba(255,255,255,0.95) 0%, rgba(255,255,255,0.9) 100%);
  --glass-bg: rgba(255, 255, 255, 0.08);
  --glass-border: rgba(255, 255, 255, 0.15);

  /* Button Gradients */
  --btn-primary: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
  --btn-success: linear-gradient(135deg, #10b981 0%, #059669 100%);
  --btn-hover-primary: linear-gradient(135deg, #4f46e5 0%, #4338ca 100%);
  --btn-hover-success: linear-gradient(135deg, #059669 0%, #047857 100%);

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1), 0 2px 4px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1), 0 10px 10px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px rgba(0, 0, 0, 0.25);
  --shadow-card: 0 4px 24px rgba(99, 102, 241, 0.15);
  --shadow-card-hover: 0 8px 32px rgba(99, 102, 241, 0.25);

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --radius-full: 9999px;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--slate-900);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ========================================
   Container
   ======================================== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-6);
  animation: fadeInUp 0.6s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ========================================
   Header
   ======================================== */
.header {
  text-align: center;
  padding: var(--space-12) 0 var(--space-8);
}

.network-info {
  margin-bottom: var(--space-6);
}

.network-name {
  font-size: 2.75rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #fff 0%, #c7d2fe 50%, #a5b4fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-2);
  text-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
}

.network-tagline {
  font-size: 1.125rem;
  color: var(--slate-400);
  font-weight: 500;
}

/* ========================================
   Section Headers
   ======================================== */
.section-header {
  text-align: center;
  margin-bottom: var(--space-8);
}

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: white;
  margin-bottom: var(--space-2);
  letter-spacing: -0.01em;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--slate-400);
  font-weight: 400;
  max-width: 400px;
  margin: 0 auto;
}

/* ========================================
   Plans Section
   ======================================== */
.plans-section {
  margin-bottom: var(--space-12);
}

.plans-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

/* ========================================
   Plan Cards - Modern Design
   ======================================== */
.plan-card {
  background: var(--card-gradient);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: var(--shadow-card);
  transition: all var(--transition-normal);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.plan-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--btn-primary);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.plan-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card-hover);
}

.plan-card:hover::before {
  opacity: 1;
}

.plan-card-compact {
  background: var(--card-gradient);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  position: relative;
  overflow: hidden;
}

.plan-card-compact::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--btn-primary);
  transform: scaleX(0);
  transition: transform var(--transition-normal);
}

.plan-card-compact:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.plan-card-compact:hover::before {
  transform: scaleX(1);
}

.plan-compact-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-3);
}

.plan-compact-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--slate-800);
  line-height: 1.3;
}

.plan-compact-time {
  background: var(--btn-primary);
  color: white;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
}

.plan-compact-price {
  color: var(--slate-600);
  font-size: 0.875rem;
  font-weight: 500;
}

.plan-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--slate-800);
  margin-bottom: var(--space-2);
}

.plan-price {
  font-size: 1.75rem;
  font-weight: 800;
  background: var(--btn-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-1);
}

.plan-validity {
  font-size: 0.875rem;
  color: var(--slate-500);
  font-weight: 500;
}

.plan-features {
  list-style: none;
  margin-bottom: var(--space-4);
}

.plan-feature {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) 0;
  color: var(--slate-600);
  font-size: 0.875rem;
}

.plan-feature::before {
  content: '✓';
  color: var(--success-500);
  font-weight: 700;
}

/* ========================================
   Buttons - Enterprise Style
   ======================================== */
.btn-primary {
  width: 100%;
  padding: var(--space-4);
  background: var(--btn-success);
  color: white;
  border: none;
  border-radius: var(--radius-lg);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background: var(--btn-hover-success);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  width: 100%;
  padding: var(--space-4);
  background: var(--glass-bg);
  color: white;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  backdrop-filter: blur(10px);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.3);
}

.btn-compact {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: var(--btn-success);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-xs);
}

.btn-compact:hover {
  background: var(--btn-hover-success);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.btn-retry {
  padding: var(--space-3) var(--space-6);
  background: var(--btn-primary);
  color: white;
  border: none;
  border-radius: var(--radius-lg);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.btn-retry:hover {
  background: var(--btn-hover-primary);
  transform: translateY(-2px);
}

.btn-link {
  background: none;
  border: none;
  color: var(--primary-500);
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: underline;
  transition: color var(--transition-fast);
}

.btn-link:hover {
  color: var(--primary-600);
}

/* ========================================
   Loading & Error States
   ======================================== */
.plans-loading {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-4);
}

.plan-skeleton {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-xl);
  height: 200px;
  border: 1px solid var(--glass-border);
  position: relative;
  overflow: hidden;
}

.plan-skeleton::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  to { left: 100%; }
}

.plans-error {
  text-align: center;
  padding: var(--space-10);
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border-radius: var(--radius-xl);
  border: 1px solid var(--glass-border);
}

.error-icon {
  font-size: 3rem;
  margin-bottom: var(--space-4);
}

.error-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: white;
  margin-bottom: var(--space-2);
}

.error-message {
  color: var(--slate-400);
  margin-bottom: var(--space-6);
}

/* ========================================
   Recovery Section - FIXED VISIBILITY
   ======================================== */
.recovery-section {
  margin-bottom: var(--space-10);
}

.recovery-card {
  background: var(--card-gradient);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: var(--shadow-card);
  max-width: 480px;
  margin: 0 auto;
}

.recovery-processing,
.recovery-success,
.recovery-error {
  text-align: center;
  padding: var(--space-6);
}

.recovery-processing .spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--slate-200);
  border-top-color: var(--primary-500);
  border-radius: 50%;
  margin: 0 auto var(--space-4);
  animation: spin 1s linear infinite;
}

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

.recovery-processing .processing-message {
  color: var(--slate-600);
  font-weight: 500;
}

.recovery-success .success-icon {
  width: 56px;
  height: 56px;
  background: var(--btn-success);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: white;
  margin: 0 auto var(--space-4);
}

.recovery-success .success-message {
  color: var(--slate-700);
  font-weight: 600;
}

.recovery-error .error-icon-small {
  width: 48px;
  height: 48px;
  background: var(--error-500);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: white;
  margin: 0 auto var(--space-4);
}

.recovery-error .error-message {
  color: var(--slate-600);
  margin-bottom: var(--space-4);
}

/* ========================================
   Voucher Section
   ======================================== */
.voucher-section {
  margin-bottom: var(--space-12);
}

.voucher-card {
  background: var(--card-gradient);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: var(--shadow-card);
  max-width: 480px;
  margin: 0 auto;
}

.voucher-help {
  text-align: center;
  margin-top: var(--space-4);
  color: var(--slate-500);
  font-size: 0.875rem;
}

.link {
  color: var(--primary-500);
  text-decoration: none;
  font-weight: 600;
  transition: color var(--transition-fast);
}

.link:hover {
  color: var(--primary-600);
  text-decoration: underline;
}

/* ========================================
   Form Styles
   ======================================== */
.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--slate-700);
  margin-bottom: var(--space-2);
}

.form-input {
  width: 100%;
  padding: var(--space-4);
  border: 2px solid var(--slate-200);
  border-radius: var(--radius-lg);
  font-size: 1rem;
  transition: all var(--transition-fast);
  background: white;
  color: var(--slate-800);
}

.form-input::placeholder {
  color: var(--slate-400);
}

.form-input:focus {
  outline: none;
  border-color: var(--primary-500);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.form-hint {
  font-size: 0.8125rem;
  color: var(--slate-500);
  margin-top: var(--space-2);
}

/* ========================================
   Modal
   ======================================== */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  animation: fadeIn var(--transition-normal);
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(8px);
}

.modal-content {
  position: relative;
  background: white;
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  max-width: 480px;
  width: 100%;
  box-shadow: var(--shadow-2xl);
  animation: slideUp var(--transition-slow);
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(40px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.modal-close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 40px;
  height: 40px;
  background: var(--slate-100);
  border: none;
  border-radius: var(--radius-full);
  font-size: 1.5rem;
  color: var(--slate-500);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--slate-200);
  color: var(--slate-700);
}

.modal-header {
  text-align: center;
  margin-bottom: var(--space-6);
}

.modal-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--slate-800);
  margin-bottom: var(--space-1);
}

.modal-subtitle {
  font-size: 0.9375rem;
  color: var(--slate-500);
}

/* ========================================
   Payment States
   ======================================== */
.payment-summary {
  background: var(--slate-50);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  margin-bottom: var(--space-5);
  border: 1px solid var(--slate-200);
}

.summary-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.summary-amount {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--success-600);
}

.payment-processing,
.payment-success,
.payment-error {
  text-align: center;
  padding: var(--space-6);
}

.processing-animation {
  margin-bottom: var(--space-4);
}

.processing-animation .spinner {
  width: 56px;
  height: 56px;
  border: 4px solid var(--slate-200);
  border-top-color: var(--primary-500);
  border-radius: 50%;
  margin: 0 auto;
  animation: spin 1s linear infinite;
}

.processing-title,
.success-title,
.error-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--slate-800);
  margin-bottom: var(--space-2);
}

.processing-message,
.success-message {
  color: var(--slate-600);
  margin-bottom: var(--space-1);
}

.processing-hint,
.success-hint {
  font-size: 0.875rem;
  color: var(--slate-500);
}

.success-icon {
  width: 72px;
  height: 72px;
  background: var(--btn-success);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  color: white;
  margin: 0 auto var(--space-4);
  animation: scaleIn 0.5s ease;
}

@keyframes scaleIn {
  from { transform: scale(0); }
  50% { transform: scale(1.1); }
  to { transform: scale(1); }
}

.voucher-code-display {
  background: var(--primary-50);
  border: 2px dashed var(--primary-400);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  font-size: 1.25rem;
  font-weight: 700;
  font-family: var(--font-mono);
  letter-spacing: 0.1em;
  margin: var(--space-4) 0;
  color: var(--primary-700);
  text-align: center;
}

.payment-error .error-icon {
  width: 72px;
  height: 72px;
  background: var(--error-500);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  color: white;
  margin: 0 auto var(--space-4);
}

/* ========================================
   Footer
   ======================================== */
.footer {
  text-align: center;
  padding: var(--space-8) 0;
  margin-top: var(--space-8);
  border-top: 1px solid var(--glass-border);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--space-6);
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
}

.footer-link {
  color: var(--slate-400);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: white;
}

.footer-copyright {
  color: var(--slate-500);
  font-size: 0.8125rem;
}

/* ========================================
   Loading Screen
   ======================================== */
.loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-gradient);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.loading-screen .spinner {
  width: 48px;
  height: 48px;
  border: 4px solid rgba(255, 255, 255, 0.2);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
  .container {
    padding: var(--space-4);
  }

  .network-name {
    font-size: 2rem;
  }

  .section-title {
    font-size: 1.375rem;
  }

  .plans-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: var(--space-3);
  }

  .plan-card,
  .recovery-card,
  .voucher-card {
    padding: var(--space-5);
  }

  .modal-content {
    padding: var(--space-6);
    margin: var(--space-4);
  }
}

@media (max-width: 480px) {
  .container {
    padding: var(--space-3);
  }

  .network-name {
    font-size: 1.75rem;
  }

  .plans-grid {
    grid-template-columns: 1fr;
  }

  .plan-card-compact {
    padding: var(--space-4);
  }

  .recovery-card,
  .voucher-card {
    padding: var(--space-4);
  }
}

/* ========================================
   Utility Classes
   ======================================== */
.hide {
  display: none !important;
}

.hidden {
  visibility: hidden;
}

/* ========================================
   Accessibility
   ======================================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus styles for accessibility */
.btn-primary:focus,
.btn-secondary:focus,
.btn-compact:focus,
.form-input:focus {
  outline: 2px solid var(--primary-500);
  outline-offset: 2px;
}