/* CSS Design System for PackCalc Global - Paper Roll Length Calculator */

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

:root {
  /* Color Palette */
  --primary-navy: #0F172A;     /* Slate 900 - Headings, Heavy UI elements */
  --secondary-navy: #1E293B;   /* Slate 800 - Cards, secondary elements */
  --accent-blue: #2563EB;      /* Blue 600 - Primary buttons, highlight focus */
  --accent-blue-hover: #1D4ED8;/* Blue 700 - Hover state */
  --neutral-gray: #64748B;     /* Slate 500 - Secondary text, borders */
  --light-gray: #F8FAFC;       /* Slate 50 - Card background, body */
  --border-gray: #E2E8F0;      /* Slate 200 - Divider lines, input borders */
  --pure-white: #FFFFFF;
  
  /* Status Colors */
  --success-green: #15803D;    /* Green 700 - Results background text */
  --success-bg: #F0FDF4;       /* Green 50 - Results card background */
  --error-red: #B91C1C;        /* Red 700 - Validation warnings */
  --error-bg: #FEF2F2;         /* Red 50 - Validation box background */
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  
  /* Layout Spaces */
  --border-radius-sm: 6px;
  --border-radius-md: 12px;
  --border-radius-lg: 16px;
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
}

/* Base resets & styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family);
  background-color: #F1F5F9;
  color: var(--secondary-navy);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.5rem 1rem;
}

/* Header styles */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-gray);
}

.logo-section {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-icon {
  width: 40px;
  height: 40px;
}

.logo-section h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-navy);
  letter-spacing: -0.025em;
}

/* Language Toggle Switch */
.lang-selector {
  display: flex;
  background-color: var(--border-gray);
  padding: 2px;
  border-radius: 20px;
}

.lang-btn {
  background: none;
  border: none;
  padding: 6px 16px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--neutral-gray);
  cursor: pointer;
  border-radius: 18px;
  transition: all var(--transition-fast);
}

.lang-btn.active {
  background-color: var(--pure-white);
  color: var(--primary-navy);
  box-shadow: var(--shadow-sm);
}

/* Main Layout Grid */
.main-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 900px) {
  .main-grid {
    grid-template-columns: 1.2fr 0.8fr;
  }
}

/* Card Wrapper */
.card {
  background-color: var(--pure-white);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--border-gray);
  box-shadow: var(--shadow-md);
  padding: 2rem;
  margin-bottom: 2rem;
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--primary-navy);
  border-left: 4px solid var(--accent-blue);
  padding-left: 0.75rem;
}

/* Form Styles */
.form-group {
  margin-bottom: 1.5rem;
}

.label-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

label {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--primary-navy);
}

.field-help {
  font-size: 0.8rem;
  color: var(--neutral-gray);
}

/* Input elements */
.input-wrapper {
  position: relative;
  display: flex;
  border: 2px solid var(--border-gray);
  border-radius: var(--border-radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.input-wrapper:focus-within {
  border-color: var(--accent-blue);
}

input[type="number"] {
  flex: 1;
  border: none;
  padding: 0.875rem 1rem;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--primary-navy);
  outline: none;
  width: 100%;
}

/* Chrome, Safari, Edge, Opera: hide spin buttons */
input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

/* Firefox: hide spin buttons */
input[type=number] {
  -moz-appearance: textfield;
}

.input-unit {
  background-color: var(--light-gray);
  padding: 0 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--neutral-gray);
  border-left: 1px solid var(--border-gray);
  min-width: 60px;
}

/* Unit Picker Toggles */
.unit-toggle-container {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px dashed var(--border-gray);
}

.unit-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--neutral-gray);
}

.unit-switch-group {
  display: flex;
  background-color: var(--light-gray);
  padding: 3px;
  border-radius: 8px;
  border: 1px solid var(--border-gray);
}

.unit-switch-btn {
  background: none;
  border: none;
  padding: 4px 12px;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--neutral-gray);
  cursor: pointer;
  border-radius: 6px;
  transition: all var(--transition-fast);
}

.unit-switch-btn.active {
  background-color: var(--primary-navy);
  color: var(--pure-white);
}

/* Validation Alert Block */
.validation-error {
  display: none;
  background-color: var(--error-bg);
  border-left: 4px solid var(--error-red);
  color: var(--error-red);
  padding: 1rem;
  border-radius: var(--border-radius-sm);
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
  font-weight: 500;
}

/* Action Buttons Grid */
.button-row {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 1rem;
  margin-bottom: 1rem;
}

.btn {
  font-family: var(--font-family);
  font-size: 1.05rem;
  font-weight: 600;
  padding: 0.9rem 1.5rem;
  border-radius: var(--border-radius-md);
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: all var(--transition-fast);
  min-height: 48px; /* Mobile accessibility touch target */
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background-color: var(--accent-blue);
  color: var(--pure-white);
}

.btn-primary:hover {
  background-color: var(--accent-blue-hover);
}

.btn-secondary {
  background-color: var(--light-gray);
  color: var(--secondary-navy);
  border: 1px solid var(--border-gray);
}

.btn-secondary:hover {
  background-color: var(--border-gray);
}

.btn-full {
  grid-column: span 2;
}

.btn-outline-blue {
  background: none;
  color: var(--accent-blue);
  border: 2px solid var(--accent-blue);
}

.btn-outline-blue:hover {
  background-color: rgba(37, 99, 235, 0.05);
}

/* Output Card & Dynamic Results styling */
.results-card {
  background-color: var(--success-bg);
  border: 1px solid rgba(21, 128, 61, 0.2);
  border-radius: var(--border-radius-lg);
  padding: 2rem;
  margin-bottom: 2rem;
}

.results-placeholder {
  text-align: center;
  color: var(--neutral-gray);
  padding: 2rem 0;
}

.results-placeholder p {
  margin-top: 0.5rem;
  font-size: 0.95rem;
}

.results-wrapper {
  display: none;
}

.results-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

@media (min-width: 480px) {
  .results-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.result-box {
  background-color: var(--pure-white);
  border: 1px solid var(--border-gray);
  border-radius: var(--border-radius-md);
  padding: 1.25rem;
  text-align: center;
}

.result-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--neutral-gray);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

.result-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--success-green);
}

/* Formula & Variables Recap Box */
.recap-box {
  background-color: var(--pure-white);
  border: 1px solid var(--border-gray);
  border-radius: var(--border-radius-md);
  padding: 1.25rem;
  margin-top: 1.5rem;
  font-size: 0.9rem;
}

.recap-title {
  font-weight: 700;
  color: var(--primary-navy);
  margin-bottom: 0.5rem;
}

.recap-item {
  display: flex;
  justify-content: space-between;
  padding: 0.25rem 0;
  border-bottom: 1px solid var(--light-gray);
}

.recap-item:last-child {
  border-bottom: none;
}

.math-expression {
  font-family: "Courier New", Courier, monospace;
  font-weight: 700;
  background-color: var(--light-gray);
  padding: 0.5rem;
  border-radius: var(--border-radius-sm);
  text-align: center;
  margin-top: 0.5rem;
  word-break: break-all;
}

/* Advertisement & Paid Product Placeholders */
.ad-slot {
  background-color: var(--light-gray);
  border: 2px dashed var(--border-gray);
  border-radius: var(--border-radius-md);
  padding: 1.5rem;
  text-align: center;
  color: var(--neutral-gray);
  margin-bottom: 2rem;
  position: relative;
  min-height: 120px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.ad-badge {
  position: absolute;
  top: 6px;
  right: 8px;
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--neutral-gray);
  border: 1px solid var(--neutral-gray);
  padding: 1px 4px;
  border-radius: 3px;
  text-transform: uppercase;
}

.ad-text {
  font-size: 0.85rem;
  margin-top: 0.5rem;
}

.polar-banner {
  background: linear-gradient(135deg, #1E293B 0%, #0F172A 100%);
  color: var(--pure-white);
  border-radius: var(--border-radius-lg);
  padding: 2rem;
  text-align: center;
  box-shadow: var(--shadow-lg);
  margin-bottom: 2rem;
}

.polar-badge {
  display: inline-block;
  background: linear-gradient(90deg, #38BDF8 0%, #818CF8 100%);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 20px;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.polar-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.polar-description {
  font-size: 0.9rem;
  color: #94A3B8;
  margin-bottom: 1.25rem;
}

/* Explanations & FAQ Section */
.info-section {
  background-color: var(--pure-white);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--border-gray);
  padding: 2rem;
  margin-bottom: 2rem;
}

.info-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--primary-navy);
  margin-bottom: 1rem;
}

.info-content {
  font-size: 0.95rem;
  color: var(--secondary-navy);
  margin-bottom: 1.5rem;
}

.info-content p {
  margin-bottom: 1rem;
}

.info-content ul {
  margin-left: 1.5rem;
  margin-bottom: 1rem;
}

.info-content li {
  margin-bottom: 0.5rem;
}

/* FAQ Accordion Styling */
.faq-container {
  margin-top: 2rem;
}

.faq-item {
  border-bottom: 1px solid var(--border-gray);
  padding: 1rem 0;
}

.faq-question {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--primary-navy);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0;
  outline: none;
}

.faq-question::after {
  content: '+';
  font-size: 1.5rem;
  color: var(--accent-blue);
  font-weight: 400;
  transition: transform var(--transition-fast);
}

.faq-item.active .faq-question::after {
  content: '-';
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal) ease-out, padding-top var(--transition-normal);
  color: var(--neutral-gray);
  font-size: 0.95rem;
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding-top: 0.75rem;
}

/* Legal Documents Section */
.legal-accordion {
  border-top: 1px solid var(--border-gray);
  margin-top: 3rem;
  padding-top: 1.5rem;
}

.legal-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary-navy);
  margin-bottom: 1rem;
}

.legal-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 600px) {
  .legal-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.legal-box {
  background-color: var(--light-gray);
  border: 1px solid var(--border-gray);
  border-radius: var(--border-radius-md);
  padding: 1.25rem;
}

.legal-box h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--primary-navy);
  margin-bottom: 0.5rem;
}

.legal-box p {
  font-size: 0.8rem;
  color: var(--neutral-gray);
  line-height: 1.5;
}

/* Footer Section */
footer {
  text-align: center;
  padding: 3rem 0;
  color: var(--neutral-gray);
  font-size: 0.85rem;
  border-top: 1px solid var(--border-gray);
  margin-top: 4rem;
}

footer p {
  margin-bottom: 0.5rem;
}

/* Toast Notification */
.copy-toast {
  position: fixed;
  bottom: -50px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--primary-navy);
  color: var(--pure-white);
  padding: 0.75rem 1.5rem;
  border-radius: var(--border-radius-md);
  font-weight: 600;
  font-size: 0.9rem;
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal) ease, bottom var(--transition-normal) ease;
}

.copy-toast.show {
  opacity: 1;
  bottom: 30px;
  pointer-events: auto;
}

/* --- PRINT MEDIA QUERIES --- */
@media print {
  body {
    background-color: #FFFFFF;
    color: #000000;
    font-size: 11pt;
  }

  .container {
    max-width: 100%;
    margin: 0;
    padding: 0;
  }

  /* Hide headers buttons, ads, polar, faqs and terms */
  header,
  .unit-toggle-container,
  .button-row,
  .validation-error,
  .ad-slot,
  .polar-banner,
  .info-section,
  .faq-container,
  .legal-accordion,
  footer,
  .card-title {
    display: none !important;
  }

  /* Remove card background shadows */
  .card, .results-card {
    border: none !important;
    background: none !important;
    box-shadow: none !important;
    padding: 0 !important;
    margin-bottom: 1.5rem !important;
  }

  /* Title for printing */
  .card::before {
    content: "PackCalc Global - Paper Roll Length Calculator Report";
    display: block;
    font-size: 16pt;
    font-weight: bold;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid #000000;
    padding-bottom: 0.5rem;
  }

  /* Structure inputs for plain presentation */
  .form-group {
    margin-bottom: 1rem;
    display: flex;
    justify-content: space-between;
    border-bottom: 1px dashed #CCCCCC;
    padding-bottom: 0.5rem;
  }

  .label-container {
    margin-bottom: 0;
  }

  .field-help {
    display: none;
  }

  .input-wrapper {
    border: none;
  }

  input[type="number"] {
    text-align: right;
    padding: 0;
    font-size: 11pt;
    background: none !important;
  }

  .input-unit {
    border-left: none;
    font-weight: normal;
    padding-left: 0.25rem;
    background: none !important;
  }

  /* Show calculation result prominently */
  .results-wrapper {
    display: block !important;
  }

  .results-grid {
    display: flex;
    justify-content: space-around;
    border: 1px solid #000000;
    padding: 1rem;
    margin-top: 1rem;
    page-break-inside: avoid;
  }

  .result-box {
    border: none !important;
    padding: 0 !important;
    background: none !important;
  }

  .result-label {
    font-size: 9pt;
    color: #000000;
  }

  .result-value {
    font-size: 16pt;
    color: #000000;
  }

  .recap-box {
    border: 1px dashed #000000 !important;
    margin-top: 1rem;
    padding: 1rem;
    page-break-inside: avoid;
  }

  .recap-title {
    font-size: 11pt;
  }

  .math-expression {
    background: #EEEEEE !important;
    border: 1px solid #CCCCCC;
    padding: 0.5rem;
    color: #000000;
    font-size: 10pt;
  }
}

/* --- Cookie & Analytics Consent Banner --- */
.consent-banner {
  position: fixed;
  bottom: 24px;
  right: 24px;
  max-width: 440px;
  width: calc(100% - 48px);
  background-color: var(--pure-white);
  border: 1px solid var(--border-gray);
  border-radius: var(--border-radius-lg);
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  padding: 24px;
  z-index: 2000;
  transform: translateY(0);
  opacity: 1;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.4s ease;
}

.consent-banner.hidden {
  transform: translateY(100px);
  opacity: 0;
  pointer-events: none;
}

.consent-banner h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary-navy);
  margin-bottom: 8px;
}

.consent-banner p {
  font-size: 0.85rem;
  color: var(--neutral-gray);
  line-height: 1.5;
  margin-bottom: 20px;
}

.consent-buttons {
  display: flex;
  gap: 12px;
}

.consent-buttons .btn {
  flex: 1;
  font-size: 0.85rem;
  min-height: 40px;
  padding: 8px 16px;
}

/* Clear accessibility focus ring for buttons */
.consent-buttons .btn:focus-visible {
  outline: 3px solid var(--primary-navy);
  outline-offset: 2px;
}

/* Footer Link-button Reset */
.btn-link {
  background: none;
  border: none;
  color: var(--primary-navy);
  text-decoration: underline;
  cursor: pointer;
  font-family: inherit;
  font-size: inherit;
  padding: 0;
  font-weight: 500;
}

.btn-link:hover {
  color: var(--accent-blue-hover);
}

/* Mobile responsive for banner */
@media (max-width: 480px) {
  .consent-banner {
    bottom: 0;
    right: 0;
    width: 100%;
    max-width: 100%;
    border-radius: 16px 16px 0 0;
    border-bottom: none;
    padding: 20px;
  }
}