/* ============================================
   METHODOLOGY PAGE STYLES
   
   This file controls the styling for the
   Methodology page (methodology.html).
   
   Page structure:
   1. Header (full-screen hero with background image)
   2. Body (cards explaining the methodology)
      - Method cards (intro, formulas, comparison)
      - Transport cards (bus, car, plane, etc.)
      - Behavioral design section
      - Limitations section

   Color palette:
   - #2d6a4f  Medium green (buttons, accents, borders)
   - #1b4332  Deep green (headings, strong text)
   - #95d5b2  Soft green (decorative borders, numbers)
   - #e8e6df  Light beige (page background, matches site)
   - #f5f1e8  Warm cream (formula blocks, highlights)
   - #ffffff  White (cards)
   - #2a4359  Accent blue (highlight boxes)
   - #1a1a1a  Dark text
   - #555555  Muted text
   ============================================ */

/* ============================================
   1. GLOBAL UTILITIES
   These override defaults for the methodology 
   page only (scoped by the page's sections).
   ============================================ */

p {
  margin: 12px 0;
  font-size: 17px;
  line-height: 1.65;
  color: #2a2a2a;
}

h3,
h4 {
  text-align: left;
  font-weight: 700;
  color: #1b4332;
}

h4 {
  font-size: 18px;
  margin: 14px 0 8px;
}

strong {
  color: #1b4332;
}

em {
  color: #2d6a4f;
  font-style: italic;
}

/* ============================================
   2. HEADER SECTION
   Full-viewport hero with background image,
   semi-transparent overlay, title, subtitle,
   and two navigation buttons.
   ============================================ */

.section_header_methodology {
  background:
    linear-gradient(
      135deg,
      rgba(205, 195, 183, 0.5) 0%,
      rgba(217, 209, 196, 0.5) 100%
    ),
    url("https://forward-static.s3.eu-north-1.amazonaws.com/gd_course/gd_course_NHH_2026_group4/icons/METHOFOR19.jpg")
      center/cover no-repeat;
  padding: 40px 0 60px;
  min-height: calc(105vh - 80px);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

/* Flex container that centers the title box */
.header {
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
}

/* The box holding title + subtitle + buttons */
.header .box {
  flex: 1;
  max-width: 900px;
  background: transparent;
  color: #1b4332;
  border-radius: 14px;
  margin: 20px 10px;
  padding: 20px 30px;
  text-align: center;
}

/* "Methodology" title */
.methodology_title {
  font-size: 62px;
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 18px;
}

/* Subtitle paragraph below the title */
.methodology_subtitle {
  color: #1b4332;
  font-size: 20px;
  font-weight: 600;
  font-family: "Arial", sans-serif;
  line-height: 1.65;
  text-align: center;
  max-width: 720px;
  margin: 0 auto 28px;
}

/* Container for the two header buttons */
.container_buttons_links_header {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

/* Green header buttons (Termpaper + Calculator) */
.methodology_btn {
  background-color: #2d6a4f;
  border-color: #2d6a4f;
  color: white;
  padding: 10px 24px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 22px;
  transition: all 0.2s ease;
}

.methodology_btn:hover {
  background-color: #1b4332;
  border-color: #1b4332;
  transform: translateY(-2px);
  box-shadow: 0 6px 14px rgba(27, 67, 50, 0.25);
}

/* ============================================
   3. BODY SECTION
   Contains all the methodology content cards.
   Uses the site's light beige background.
   ============================================ */

.section_body_methodology {
  background-color: #e8e6df;
  padding: 50px 0 80px;
}

/* Limit content width for readability */
.section_body_methodology .container {
  max-width: 1050px;
}

/* ============================================
   4. METHOD CARDS
   White rounded cards used for major sections:
   intro, formulas, comparison chart, behavioral
   design, and limitations.
   ============================================ */

/* Default white card */
.method_card {
  background: #ffffff;
  border-radius: 16px;
  padding: 32px 36px;
  margin: 24px auto;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
  border: 1px solid rgba(45, 106, 79, 0.08);
}

/* Green-tinted variant (used for behavioral design section) */
.method_card_accent {
  background: linear-gradient(135deg, #ffffff 0%, #e8f5ee 100%);
  border: 1px solid rgba(45, 106, 79, 0.2);
}

/* Muted variant with dashed border (used for limitations section) */
.method_card_muted {
  background: #fafaf7;
  border: 1px dashed rgba(45, 106, 79, 0.25);
}

/* Section title inside a method card */
.card_title {
  font-size: 28px;
  font-weight: 700;
  color: #1b4332;
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 3px solid #95d5b2;
  text-align: left;
}

/* ============================================
   5. FORMULA BLOCKS
   Two-column grid showing private vehicle
   vs collective transport formulas.
   ============================================ */

/* Side-by-side layout for the two formula blocks */
.formula_grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 24px;
}

/* Each formula block (cream background, green left border) */
.formula_block {
  background: #f5f1e8;
  border-radius: 12px;
  padding: 22px 24px;
  border-left: 4px solid #2d6a4f;
}

.formula_block h4 {
  margin-top: 0;
  color: #1b4332;
  font-size: 19px;
}

/* Small label above formula (e.g. "Cars, motorbikes") */
.formula_label {
  font-size: 14px !important;
  color: #666 !important;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-top: 0 !important;
  margin-bottom: 10px !important;
  font-weight: 600;
}

/* White box containing the LaTeX formula */
.formula_math {
  background: white;
  padding: 16px;
  border-radius: 8px;
  text-align: center;
  font-size: 18px;
  margin: 14px 0;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.04);
}

/* Variable definitions list below the formula */
.formula_vars {
  list-style: none;
  padding-left: 0;
  font-size: 15px;
}

.formula_vars li {
  padding: 4px 0;
  color: #444;
}

/* Italic note below a formula (e.g. explaining why no /p needed) */
.formula_note {
  font-size: 14px !important;
  color: #666 !important;
  font-style: italic;
  margin-top: 14px !important;
}

/* ============================================
   6. TRANSPORT CARDS
   One card per transport mode (Bus, Car, Plane,
   Train, Ferry, Motorbike, Bicycle/Walk).
   Each has a colored header + white body.
   ============================================ */

/* Card container */
.transport_card {
  background: #ffffff;
  border-radius: 16px;
  margin: 20px auto;
  overflow: hidden;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease;
}

/* Hover lift effect */
.transport_card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

/* Colored header bar (icon + transport name) */
.transport_header {
  display: flex;
  align-items: center;
  padding: 20px 32px;
  color: white;
}

.transport_header h3 {
  color: white;
  margin: 0 0 0 16px;
  font-size: 26px;
}

/* Emoji icon in the header */
.transport_icon {
  font-size: 40px;
  line-height: 1;
}

/* --- Per-transport color themes --- */
.transport_header_bus {
  background: linear-gradient(135deg, #f2c76a 0%, #e8a53d 100%);
}
.transport_header_car {
  background: linear-gradient(135deg, #7dd3a9 0%, #4a9e72 100%);
}
.transport_header_plane {
  background: linear-gradient(135deg, #ef7d7d 0%, #d14646 100%);
}
.transport_header_train {
  background: linear-gradient(135deg, #82c9d9 0%, #4a94a8 100%);
}
.transport_header_ferry {
  background: linear-gradient(135deg, #8ca8e6 0%, #5570c4 100%);
}
.transport_header_motorbike {
  background: linear-gradient(135deg, #f9c74f 0%, #f9844a 100%);
}
.transport_header_human {
  background: linear-gradient(135deg, #95d5b2 0%, #2d6a4f 100%);
}

/* White body below the colored header */
.transport_body {
  padding: 26px 32px 30px;
}

/* ============================================
   7. EMISSION TABLES
   Used inside transport cards to show
   emission factors per fuel type.
   ============================================ */

.emission_table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 18px 0;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

/* Green header row */
.emission_table thead tr {
  background: #2d6a4f;
}

.emission_table th {
  padding: 12px 16px;
  color: white;
  font-weight: 600;
  text-align: left;
  font-size: 15px;
}

.emission_table td {
  padding: 11px 16px;
  border-bottom: 1px solid #eee;
  font-size: 15px;
  color: #333;
}

/* Alternating row colors */
.emission_table tbody tr:nth-child(even) {
  background: #f9f7f2;
}

/* Hover highlight */
.emission_table tbody tr:hover {
  background: #e8f5ee;
}

/* Remove border on last row */
.emission_table tbody tr:last-child td {
  border-bottom: none;
}

/* ============================================
   8. HIGHLIGHT BOXES
   Callout boxes used inside transport cards
   (e.g. "Why isn't electric zero?", 
   "The carpooling effect").
   ============================================ */

/* Default highlight (blue accent) */
.highlight_box {
  background: #f5f1e8;
  border-left: 4px solid #2a4359;
  border-radius: 8px;
  padding: 18px 22px;
  margin: 20px 0;
}

.highlight_box h4 {
  margin-top: 0;
  color: #2a4359;
  font-size: 17px;
}

.highlight_box p {
  margin-bottom: 0;
  font-size: 16px;
}

/* Positive variant (green accent, used for carpooling) */
.highlight_positive {
  background: #e8f5ee;
  border-left-color: #2d6a4f;
}

.highlight_positive h4 {
  color: #1b4332;
}

/* ============================================
   9. COMPARISON CHART
   Horizontal bar chart comparing all transport
   modes by g CO₂e per passenger-km.
   ============================================ */

.comparison_chart {
  margin: 24px 0;
  background: #fafaf7;
  border-radius: 12px;
  padding: 20px 24px;
}

/* Each row: label | bar | value */
.comparison_row {
  display: grid;
  grid-template-columns: 200px 1fr 70px;
  align-items: center;
  gap: 14px;
  margin: 10px 0;
  font-size: 15px;
}

/* Transport name (right-aligned next to bar) */
.comparison_label {
  font-weight: 600;
  color: #333;
  text-align: right;
}

/* The colored bar (width set inline in HTML) */
.comparison_bar {
  height: 28px;
  border-radius: 6px;
  transition: width 0.4s ease;
  min-width: 4px;
}

/* Bar colors: green (low emissions) → red (high emissions) */
.comparison_bar_0 {
  background: linear-gradient(90deg, #95d5b2, #74c69d);
} /* Bicycle/Walk */
.comparison_bar_1 {
  background: linear-gradient(90deg, #74c69d, #52b788);
} /* Train */
.comparison_bar_2 {
  background: linear-gradient(90deg, #52b788, #40916c);
} /* Bus */
.comparison_bar_3 {
  background: linear-gradient(90deg, #40916c, #2d6a4f);
} /* Car shared */
.comparison_bar_4 {
  background: linear-gradient(90deg, #f2c76a, #e8a53d);
} /* Car solo + Motorbike */
.comparison_bar_5 {
  background: linear-gradient(90deg, #f0966a, #e8754a);
} /* Flight economy */
.comparison_bar_6 {
  background: linear-gradient(90deg, #ef7d7d, #d14646);
} /* Ferry */
.comparison_bar_7 {
  background: linear-gradient(90deg, #d14646, #8b1e1e);
} /* Flight business */

/* g CO₂e value shown after the bar */
.comparison_value {
  font-weight: 700;
  color: #1b4332;
  text-align: left;
  font-size: 15px;
}

/* Small italic caption below the chart */
.chart_caption {
  font-size: 14px !important;
  color: #777 !important;
  text-align: center !important;
  font-style: italic;
  margin-top: 12px !important;
}

/* ============================================
   10. BEHAVIORAL DESIGN SECTION
   Three-column grid showing the three nudge
   principles (timing, framing, comparison).
   ============================================ */

/* Three equal columns */
.principles_grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin: 28px 0;
}

/* Each principle card */
.principle_block {
  background: white;
  border-radius: 12px;
  padding: 24px 22px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  border-top: 4px solid #2d6a4f;
}

/* Big decorative number (01, 02, 03) */
.principle_number {
  font-size: 36px;
  font-weight: 800;
  color: #95d5b2;
  line-height: 1;
  margin-bottom: 8px;
}

.principle_block h4 {
  margin-top: 0;
  font-size: 17px;
  color: #1b4332;
  margin-bottom: 10px;
}

.principle_block p {
  font-size: 15px;
  line-height: 1.55;
  color: #444;
  margin: 0;
}

/* Italic closing line below the principles grid */
.closing_line {
  font-size: 18px !important;
  font-style: italic;
  color: #2d6a4f !important;
  text-align: center !important;
  margin-top: 24px !important;
  padding: 18px;
  background: white;
  border-radius: 10px;
}

/* ============================================
   11. LIMITATIONS LIST
   Checkmark list used in the "Honesty About
   Limitations" section.
   ============================================ */

.limitations_list {
  list-style: none;
  padding-left: 0;
  margin: 16px 0;
}

.limitations_list li {
  padding: 8px 0 8px 28px;
  position: relative;
  font-size: 16px;
  color: #444;
}

/* Green checkmark before each item */
.limitations_list li:before {
  content: "✓";
  position: absolute;
  left: 0;
  color: #2d6a4f;
  font-weight: bold;
  font-size: 18px;
}

/* ============================================
   12. RESPONSIVE
   Adjustments for tablets and phones.
   ============================================ */

@media (max-width: 900px) {
  .header {
    flex-direction: column;
  }

  .formula_grid,
  .principles_grid {
    grid-template-columns: 1fr;
  }

  .comparison_row {
    grid-template-columns: 130px 1fr 60px;
    font-size: 13px;
  }

  .comparison_label {
    font-size: 13px;
  }
}

@media (max-width: 600px) {
  .method_card,
  .transport_body {
    padding: 20px 18px;
  }

  .methodology_title {
    font-size: 44px !important;
  }

  .card_title {
    font-size: 22px;
  }

  .transport_header {
    padding: 16px 20px;
  }

  .transport_header h3 {
    font-size: 22px;
  }

  .transport_icon {
    font-size: 32px;
  }

  .comparison_row {
    grid-template-columns: 100px 1fr 50px;
    gap: 8px;
    font-size: 12px;
  }
}