@import 'reset.css';

:root {
  --font-family: 'Segoe UI', Arial, sans-serif;
  --color-bg: #f6f8fa;
  --color-surface: #ffffff;
  --color-header: #eaf6ea;
  --color-border: #d0e6d0;
  --color-primary: #228b22;
  --color-primary-dark: #176d16;
  --color-text: #222222;
  --color-muted: #444444;
  --color-success: #d0e6d0;
  --color-success-text: #228b22;
  --color-warning: #fff3cd;
  --color-warning-text: #b8860b;
  --color-danger: #f8d7da;
  --color-danger-text: #c82333;

  --shadow: 0 2px 12px rgba(34, 139, 34, 0.08);
  --shadow-light: 0 1px 4px rgba(34, 139, 34, 0.04);
  --shadow-hover: 0 2px 8px rgba(34, 139, 34, 0.1);
  --shadow-active: 0 2px 12px rgba(34, 139, 34, 0.15);
}

body {
  font-family: var(--font-family);
  background: var(--color-bg);
  color: var(--color-text);
  margin: 0;
  min-height: 100vh;
}

header {
  background: linear-gradient(180deg, var(--color-header), rgba(234, 246, 234, 0.95));
  padding: 2.4rem 1rem 1.4rem;
  text-align: center;
  border-bottom: 1px solid rgba(208, 230, 208, 0.6);
  box-shadow: 0 1px 8px rgba(34, 139, 34, 0.03);
  border-bottom-left-radius: 12px;
  border-bottom-right-radius: 12px;
}

header h1 {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 0.25rem;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  letter-spacing: 0.2px;
}

header h1 span[role='img'] {
  font-size: 1.6rem;
  line-height: 1;
  transform: translateY(-1px);
}

header p {
  font-size: 1.05rem;
  color: var(--color-muted);
  max-width: 720px;
  margin: 0.4rem auto 0;
  opacity: 0.95;
}

main {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 2rem 1rem;
}

form#co2Form {
  background: var(--color-surface);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 2rem;
  max-width: 760px;
  width: 100%;

  /* Form layout: two-column grid */
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.2rem;
  align-items: start;
}

/* Form: make key children span full width (headings, description, transport, submit) */
form#co2Form h2,
form#co2Form #formDesc,
form#co2Form fieldset,
form#co2Form button[type='submit'],
form#co2Form #emissionResult {
  grid-column: 1 / -1;
}

form#co2Form #emissionResult {
  margin-top: 0.6rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  background: var(--color-header);
  color: var(--color-text);
  font-weight: 600;
  text-align: center;
}

form#co2Form #emissionResult[hidden] {
  display: none;
}

form#co2Form #emissionResult.result {
  text-align: left;
  font-weight: 500;
  border-width: 2px;
  box-shadow: var(--shadow-light);
}

form#co2Form #emissionResult.result--low {
  background: var(--color-success);
  border-color: var(--color-success-text);
}

form#co2Form #emissionResult.result--medium {
  background: var(--color-warning);
  border-color: var(--color-warning-text);
}

form#co2Form #emissionResult.result--high {
  background: var(--color-danger);
  border-color: var(--color-danger-text);
}

form#co2Form #emissionResult.result--message {
  background: var(--color-bg);
  border-color: var(--color-border);
  text-align: center;
  font-weight: 600;
}

form#co2Form #emissionResult .result-title {
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 0.35rem;
}

form#co2Form #emissionResult .result-summary {
  display: grid;
  gap: 0.2rem;
}

form#co2Form #emissionResult .result-impact {
  margin-top: 0.35rem;
}

form#co2Form #emissionResult .result-section {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid rgba(0, 0, 0, 0.08);
}

form#co2Form #emissionResult .result-section-title {
  font-weight: 700;
  margin-bottom: 0.4rem;
}

form#co2Form #emissionResult .result-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.25rem;
}

@media (min-width: 600px) {
  form#co2Form #emissionResult .result-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 1rem;
  }
}

/* Form: default grid item behavior for direct children */
form#co2Form > div {
  display: flex;
  flex-direction: column;
}

/* Checkbox row: inline layout for checkbox + label */
.checkbox-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

/* Responsive: switch form grid to single column under 600px */
@media (max-width: 600px) {
  form#co2Form {
    grid-template-columns: 1fr;
  }
}

form#co2Form h2 {
  font-size: 1.4rem;
  color: var(--color-primary);
  margin-bottom: 0.2rem;
}

form#co2Form label:not(.transport-option label) {
  font-weight: 500;
  margin-bottom: 0.3rem;
  display: block;
}

form#co2Form input[type='number'],
form#co2Form select,
form#co2Form input[type='text'] {
  width: 100%;
  padding: 0.6rem 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 1rem;
  background: var(--color-bg);
  margin-bottom: 0.5rem;
  transition:
    border-color 0.18s ease,
    box-shadow 0.18s ease,
    transform 0.06s ease;
}

form#co2Form input[type='number']:hover,
form#co2Form select:hover,
form#co2Form input[type='text']:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-light);
  transform: translateY(-1px);
}

form#co2Form input[type='number']:active,
form#co2Form select:active,
form#co2Form input[type='text']:active {
  transform: translateY(0);
}

form#co2Form input[type='number']:focus-visible,
form#co2Form select:focus-visible,
form#co2Form input[type='text']:focus-visible {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: var(--shadow-hover);
}

form#co2Form select {
  appearance: none;
  background-image:
    linear-gradient(45deg, transparent 50%, var(--color-muted) 50%),
    linear-gradient(135deg, var(--color-muted) 50%, transparent 50%);
  background-position:
    calc(100% - 18px) calc(1em + 2px),
    calc(100% - 13px) calc(1em + 2px);
  background-size:
    6px 6px,
    6px 6px;
  background-repeat: no-repeat;
}

form#co2Form input[type='checkbox'] {
  margin-right: 0.5rem;
}

form#co2Form fieldset {
  border: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

form#co2Form legend {
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

form#co2Form div {
  display: flex;
  flex-direction: column;
}

form#co2Form fieldset > div {
  flex: 1 1 45%;
  min-width: 120px;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

form#co2Form input[type='radio'] {
  accent-color: var(--color-primary);
}

form#co2Form button[type='submit'] {
  background: var(--color-primary);
  color: #fff;
  font-size: 1.1rem;
  font-weight: 600;
  border: none;
  border-radius: 6px;
  padding: 0.7rem 0.5rem;
  cursor: pointer;
  margin-top: 1rem;
  transition: background 0.2s;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  white-space: normal;
  word-break: break-word;
}

form#co2Form button[type='submit']:hover,
form#co2Form button[type='submit']:focus {
  background: var(--color-primary-dark);
}

/* Transport group: responsive grid of transport options */

.transport-group {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.transport-option {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  background: var(--color-bg);
  border-radius: 8px;
  padding: 0.8rem 0.9rem;
  box-shadow: var(--shadow-light);
  transition:
    box-shadow 0.2s,
    border 0.2s,
    background 0.2s;
  border: 2px solid transparent;
  cursor: pointer;
}
.transport-option input[type='radio'] {
  margin-right: 1rem;
  accent-color: var(--color-primary);
  transform: scale(1.18);
  cursor: pointer;
  align-self: flex-start;
  margin-top: 0.15rem;
}
.transport-option label {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  cursor: pointer;
  width: 100%;
}
.transport-top {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 0.6rem;
}
.transport-bottom {
  display: flex;
  flex-direction: row;
  gap: 0.5rem;
  align-items: center;
}
.transport-top .transport-icon,
.transport-top .transport-title {
  display: inline-block;
}
.transport-icon {
  font-size: 1.6rem;
  width: auto;
}
.transport-title {
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0;
}
.transport-rate {
  font-size: 0.98rem;
  color: var(--color-muted);
  background: var(--color-header);
  border-radius: 4px;
  padding: 0.2rem 0.5rem;
}
.transport-sustainability {
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: 4px;
  padding: 0.2rem 0.6rem;
}
.transport-sustainability.sustainable {
  background: var(--color-success);
  color: var(--color-success-text);
}
.transport-sustainability.medium {
  background: var(--color-warning);
  color: var(--color-warning-text);
}
.transport-sustainability.unsustainable {
  background: var(--color-danger);
  color: var(--color-danger-text);
}

/* Checkbox: custom visuals for #roundTrip input (hidden input + styled label) */
#roundTrip {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}
label[for='roundTrip'] {
  position: relative;
  padding-left: 1.9rem;
  cursor: pointer;
  user-select: none;
}
label[for='roundTrip']::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 1.2rem;
  height: 1.2rem;
  border: 2px solid var(--color-border);
  border-radius: 4px;
  background: var(--color-surface);
  box-sizing: border-box;
  transition:
    border-color 0.12s ease,
    background 0.12s ease,
    box-shadow 0.12s ease;
}
label[for='roundTrip']::after {
  content: '✔';
  position: absolute;
  left: 0.18rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.85rem;
  color: #fff;
  display: none;
}
label[for='roundTrip']:hover::before {
  border-color: var(--color-primary);
  box-shadow: 0 1px 6px rgba(34, 139, 34, 0.06);
}
#roundTrip:focus + label[for='roundTrip']::before {
  box-shadow: 0 0 0 4px rgba(34, 139, 34, 0.12);
  border-color: var(--color-primary);
}
#roundTrip:hover + label[for='roundTrip']::before {
  border-color: var(--color-primary);
}
#roundTrip:checked + label[for='roundTrip']::before {
  background: var(--color-primary);
  border-color: var(--color-primary);
}
#roundTrip:checked + label[for='roundTrip']::after {
  display: block;
}

/* Transport: hover, focus and checked visual states for options */
.transport-option:hover,
.transport-option:has(input[type='radio']:hover),
.transport-option:has(input[type='radio']:focus) {
  background: var(--color-header);
  box-shadow: var(--shadow-hover);
  border-color: var(--color-primary);
}
.transport-option:has(input[type='radio']:checked) {
  background: var(--color-success);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-active);
}

@media (max-width: 600px) {
  main {
    padding: 1rem 0.2rem;
  }
  form#co2Form {
    padding: 1rem;
    max-width: 100%;
    grid-template-columns: 1fr;
  }
  .transport-group {
    grid-template-columns: 1fr;
  }
  .transport-option {
    padding: 0.7rem 0.6rem;
  }
}