/* ============================================
   CALCULATOR CSS - Single Source of Truth
   Mobile-first design, no conflicts
   ============================================ */

/* CSS Variables & Design Tokens */
:root {
  /* Breakpoints */
  --mobile: 768px;
  --tablet: 1024px;
  
  /* Touch targets */
  --touch-min: 44px;
  --touch-optimal: 48px;
  --touch-large: 56px;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  
  /* Colors */
  --indigo-deep: #1e3a8a;
  --primary-dark: #1e40af;
  --gold-accent: #f59e0b;
  --text-color: #1f2937;
  --text-light: #6b7280;
  --border-color: #d1d5db;
  --focus-color: #3b82f6;
  --error-color: #dc2626;
  --success-color: #059669;
  
  /* Form specific */
  --input-height: 48px;
  --input-padding: 0.75rem;
  --border-radius: 8px;
  --border-radius-lg: 12px;
  --border-radius-xl: 16px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
}

/* Base Calculator Styles */
.calculator-page {
  background: linear-gradient(135deg, var(--indigo-deep) 0%, var(--primary-dark) 100%);
  min-height: 100vh;
  overflow-x: hidden;
}

.calculator-page main {
  padding: 0;
  margin: 0;
}

/* Mobile-First Header Optimization */
@media (max-width: 768px) {
  .calculator-page .page-header {
    padding: 0.5rem 0;
    min-height: 56px; /* Fixed height for mobile */
    max-height: 56px;
    background: var(--indigo-deep);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
  }
  
  .calculator-page .logo {
    padding: 0.25rem 1rem;
  }
  
  .calculator-page .logo-svg {
    height: 28px;
    width: 28px;
  }
  
  .calculator-page .logo-text {
    font-size: 1rem;
  }
  
  /* Hide instructions box completely on mobile */
  .calculator-page .instructions-box {
    display: none !important;
  }
  
  /* Push form to top - ensure above fold on mobile */
  .calculator-page #new-user-view {
    padding-top: 0;
    margin-top: 0;
  }
  
  .calculator-page #new-user-view h1 {
    font-size: 1.2rem;
    margin: 0.75rem 1rem 0.5rem 1rem;
    text-align: center;
    color: white;
    line-height: 1.2;
    font-weight: 600;
  }
  
  /* Compact form styling - start immediately below header */
  .calculator-page #chartCalculatorForm {
    margin-top: 0;
    padding: 1.25rem 1rem 1.5rem 1rem;
    border-radius: var(--border-radius-xl) var(--border-radius-xl) 0 0;
    background: white;
    box-shadow: var(--shadow-xl);
    width: 100%;
    max-width: none;
  }
  
  /* Compact form fields */
  .calculator-page .form-group {
    margin-bottom: 2.5rem;
    position: relative;
  }
  
  .calculator-page .form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.5rem;
  }
  
  .calculator-page .form-group input,
  .calculator-page .form-group select {
    width: 100%;
    height: var(--touch-large);
    padding: var(--input-padding);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 16px; /* Prevents zoom on iOS */
    -webkit-appearance: none;
    background: #fff;
    color: var(--text-color);
    box-sizing: border-box;
    transition: all 0.2s ease;
  }

  /* Ensure native date/time inputs span full width on mobile */
  .calculator-page .form-group input[type="time"],
  .calculator-page .form-group input[type="date"] {
    width: 100% !important;
    max-width: 100% !important;
    min-width: 0;
    display: block;
  }
  
  .calculator-page .form-group input:focus,
  .calculator-page .form-group select:focus {
    border-color: var(--focus-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
    transform: translateY(-1px);
  }
  
  /* Neutral by default; success only after validation + dirty */
  .calculator-page .form-group input,
  .calculator-page .form-group select {
    background-color: #fff;
    border-color: var(--border-color);
  }
  .calculator-page .form-group input.is-valid,
  .calculator-page .form-group select.is-valid {
    border-color: #059669; /* darker for contrast */
    background-color: #f0fff4;
  }
  
  /* Error state */
  .calculator-page .form-group input.is-invalid,
  .calculator-page .form-group select.is-invalid {
    border-color: #dc2626;
    background-color: #fef2f2;
  }
  
  .calculator-page .form-hint {
    display: block;
    font-size: 0.7rem;
    color: var(--text-light);
    margin-top: 0.5rem;
    margin-bottom: 0.75rem;
    line-height: 1.3;
    word-wrap: break-word;
    overflow-wrap: break-word;
    max-width: 100%;
    padding: 0.25rem 0;
    background: transparent;
    border-radius: 0;
    border-left: none;
  }
  
  /* Primary submit button */
  .calculator-page .action-button,
  .calculator-page button[type="submit"] {
    width: 100%;
    height: var(--touch-large);
    background: linear-gradient(135deg, var(--gold-accent) 0%, #e6c300 100%);
    color: var(--indigo-deep);
    border: none;
    border-radius: var(--border-radius-lg);
    font-size: 1.125rem;
    font-weight: 700;
    margin-top: 1.5rem;
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    transition: all 0.2s ease;
  }
  
  .calculator-page .action-button:hover,
  .calculator-page .action-button:focus,
  .calculator-page button[type="submit"]:hover,
  .calculator-page button[type="submit"]:focus {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
  }
  
  .calculator-page .action-button:active,
  .calculator-page button[type="submit"]:active {
    transform: scale(0.98);
  }
  
  /* Location status and info */
  .calculator-page .location-status {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.2rem;
  }
  
  .calculator-page .location-info {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-top: 0.5rem;
    padding: 0.5rem;
    background: rgba(30, 58, 138, 0.05);
    border-radius: var(--border-radius);
  }
  
  /* Validation errors */
  .calculator-page .validation-errors {
    background: #ffebee;
    border: 1px solid var(--error-color);
    border-radius: var(--border-radius);
    padding: 1rem;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    color: var(--error-color);
  }
  
  .calculator-page .error-field {
    border-color: var(--error-color) !important;
    background-color: #fff6f6;
  }
  
  /* Loading indicator */
  .calculator-page #calculator-loading {
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    text-align: center;
    color: white;
    margin-bottom: 1rem;
    backdrop-filter: blur(10px);
  }
  
  /* Session warnings */
  .calculator-page .session-warning {
    margin: 1rem;
    padding: 1rem;
    border-radius: var(--border-radius-lg);
    font-size: 0.9rem;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    color: white;
  }
  
  .calculator-page .session-warning.hidden {
    display: none;
  }
  
  /* Button groups */
  .calculator-page .button-group {
    text-align: center;
    margin: 1rem 0;
  }
  
  .calculator-page .button-group .action-button {
    display: inline-block;
    max-width: 300px;
    margin: 0 auto;
  }
  
  /* Returning user view */
  .calculator-page #returning-user-view {
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-xl);
    padding: 2rem 1.5rem;
    text-align: center;
    backdrop-filter: blur(10px);
    margin: 1rem;
  }
  
  .calculator-page #returning-user-view h1 {
    color: var(--gold-accent);
    font-size: 1.8rem;
    margin-bottom: 1rem;
  }
  
  .calculator-page #returning-user-view .action-button {
    max-width: 320px;
    margin: 0 auto;
  }
  
  .calculator-page #returning-user-view .inline-link {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
  }
  
  /* Hide heavy content on mobile */
  .calculator-page .seo-content,
  .calculator-page .faq-section,
  .calculator-page .technical-details,
  .calculator-page .content-links,
  .calculator-page .educational-links,
  .calculator-page .faq-item,
  .calculator-page .tech-detail,
  .calculator-page .content-link-card,
  .calculator-page .educational-link-card,
  .calculator-page [style*="faq-item"],
  .calculator-page [style*="technical-details"],
  .calculator-page [style*="content-links"],
  .calculator-page [style*="educational-links"] {
    display: none !important;
  }
  
  /* Hide ALL content below the form on mobile */
  .calculator-page #chartCalculatorForm + *,
  .calculator-page #chartCalculatorForm ~ * {
    display: none !important;
  }
}

/* Very small screens */
@media (max-width: 400px) {
  .calculator-page main {
    padding: 0.5rem;
  }
  
  .calculator-page #chartCalculatorForm {
    padding: 1rem 0.75rem 1.25rem 0.75rem;
  }
  
  .calculator-page #new-user-view h1 {
    font-size: 1.1rem;
    margin: 0.5rem 0.75rem 0.25rem 0.75rem;
  }
  
  .calculator-page .form-group {
    margin-bottom: 1.5rem;
  }
  
  .calculator-page .form-hint {
    margin-bottom: 0.5rem;
    font-size: 0.65rem;
  }
  
  /* Ensure "Birth date" label is fully visible */
  .calculator-page .form-group label {
    font-size: 0.8rem;
    margin-bottom: 0.4rem;
  }
}

/* Landscape phones */
@media (max-width: 768px) and (orientation: landscape) {
  .calculator-page main {
    padding: 0.5rem;
  }
  
  .calculator-page #chartCalculatorForm {
    padding: 1.5rem 1rem;
  }
  
  .calculator-page #new-user-view h1 {
    font-size: 1.2rem;
    margin: 0.5rem 0 1rem 0;
  }
}

/* Tablet adjustments */
@media (min-width: 769px) and (max-width: 1024px) {
  .calculator-container {
    max-width: 600px;
    margin: 2rem auto;
  }
  
  .calculator-page #chartCalculatorForm {
    padding: 2rem;
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-lg);
  }
  
  .calculator-page .instructions-box {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    backdrop-filter: blur(10px);
  }
  
  .calculator-page .instructions-box h2 {
    color: var(--gold-accent);
    font-size: 1.4rem;
    margin-bottom: 1rem;
    text-align: center;
  }
  
  .calculator-page .instructions-box p {
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.6;
    margin-bottom: 1rem;
    text-align: center;
  }
  
  .calculator-page .instructions-box a {
    color: var(--gold-accent);
    text-decoration: underline;
  }
}

/* Desktop - show everything */
@media (min-width: 1025px) {
  .calculator-page .instructions-box {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    backdrop-filter: blur(10px);
  }
  
  .calculator-page .instructions-box h2 {
    color: var(--gold-accent);
    font-size: 1.4rem;
    margin-bottom: 1rem;
    text-align: center;
  }
  
  .calculator-page .instructions-box p {
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.6;
    margin-bottom: 1rem;
    text-align: center;
  }
  
  .calculator-page .instructions-box a {
    color: var(--gold-accent);
    text-decoration: underline;
  }
  
  .calculator-page #new-user-view h1 {
    font-size: 1.8rem;
    color: white;
    text-align: center;
    margin: 1rem 0 1.5rem 0;
    line-height: 1.3;
  }
  
  .calculator-page #chartCalculatorForm {
    background: white;
    border-radius: var(--border-radius-xl);
    padding: 2rem 1.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-xl);
    width: 100%;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
  }
  
  .calculator-page .form-group {
    margin-bottom: 1.5rem;
  }
  
  .calculator-page .form-group label {
    font-weight: 600;
    color: var(--indigo-deep);
    margin-bottom: 0.5rem;
    display: block;
    font-size: 1rem;
  }
  
  .calculator-page .form-group input,
  .calculator-page .form-group select {
    width: 100%;
    min-height: var(--touch-large);
    padding: 1rem;
    border: 2px solid #e0e0e0;
    border-radius: var(--border-radius-lg);
    font-size: 1rem;
    background: #fff;
    color: var(--text-color);
    box-sizing: border-box;
    transition: all 0.3s ease;
  }
  
  .calculator-page .form-group input:focus,
  .calculator-page .form-group select:focus {
    border-color: var(--indigo-deep);
    outline: none;
    box-shadow: 0 0 0 3px rgba(30, 58, 138, 0.1);
    transform: translateY(-1px);
  }
  
  .calculator-page .form-hint {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-top: 0.5rem;
    line-height: 1.4;
  }
  
  .calculator-page .action-button,
  .calculator-page button[type="submit"] {
    width: 100%;
    min-height: var(--touch-large);
    background: linear-gradient(135deg, var(--gold-accent) 0%, #e6c300 100%);
    color: var(--indigo-deep);
    font-size: 1.1rem;
    font-weight: 700;
    border: none;
    border-radius: var(--border-radius-lg);
    margin-top: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 16px rgba(255, 215, 0, 0.3);
  }
  
  .calculator-page .action-button:hover,
  .calculator-page .action-button:focus,
  .calculator-page button[type="submit"]:hover,
  .calculator-page button[type="submit"]:focus {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(255, 215, 0, 0.4);
  }
  
  .calculator-page .action-button:active,
  .calculator-page button[type="submit"]:active {
    transform: translateY(0);
  }
  
  .calculator-page #returning-user-view {
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-xl);
    padding: 2rem 1.5rem;
    text-align: center;
    backdrop-filter: blur(10px);
    margin: 1rem 0;
  }
  
  .calculator-page #returning-user-view h1 {
    color: var(--gold-accent);
    font-size: 1.8rem;
    margin-bottom: 1rem;
  }
  
  .calculator-page #returning-user-view .action-button {
    max-width: 320px;
    margin: 0 auto;
  }
}

  /* Unknown time toggle */
  .calculator-page .unknown-time-toggle {
    margin-top: 0.75rem;
    padding: 0.75rem;
    background: rgba(30, 58, 138, 0.05);
    border-radius: var(--border-radius);
    border-left: 2px solid var(--indigo-deep);
  }
  
  .calculator-page .checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.8rem;
    color: var(--text-color);
    line-height: 1.4;
  }
  
  .calculator-page .checkbox-label input[type="checkbox"] {
    margin: 0;
    width: auto;
    height: auto;
    flex-shrink: 0;
    margin-top: 0.1rem;
  }
  
  /* Timezone preview */
  .calculator-page .timezone-preview {
    margin-top: 0.5rem;
    padding: 0.5rem;
    background: rgba(30, 58, 138, 0.08);
    border-radius: var(--border-radius);
    font-size: 0.75rem;
    color: var(--text-light);
    border-left: 2px solid var(--indigo-deep);
  }
  
  /* Privacy notice */
  .calculator-page .privacy-notice {
    margin-top: 1rem;
    text-align: center;
    padding: 0.75rem;
    background: rgba(30, 58, 138, 0.05);
    border-radius: var(--border-radius);
    border: 1px solid rgba(30, 58, 138, 0.1);
  }
  
  .calculator-page .privacy-notice small {
    color: var(--text-light);
    font-size: 0.75rem;
    line-height: 1.4;
  }
  
  /* Utility classes */
  .hidden {
    display: none !important;
  }
  
  .visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
    white-space: nowrap;
  }

/* Focus management for accessibility */
.calculator-page *:focus {
  outline: 2px solid var(--focus-color);
  outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .calculator-page .form-group input,
  .calculator-page .form-group select {
    border-width: 2px;
  }
  
  .calculator-page .action-button,
  .calculator-page button[type="submit"] {
    border: 2px solid var(--text-color);
  }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  .calculator-page * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}