/* ====================================================
   もりみえる - design system
   Color palette inspired by deep Japanese forests
   ==================================================== */
:root {
  --green-900: #1f3d2a;
  --green-700: #2d5a3d;
  --green-500: #5a8a3a;
  --green-300: #a7c498;
  --green-100: #e7efde;

  --earth-600: #8c5a3a;
  --earth-500: #c47a4a;
  --earth-300: #e6c4a0;

  --cream: #faf6ef;
  --paper: #ffffff;
  --ink-900: #2a2820;
  --ink-700: #4a4838;
  --ink-500: #7a786a;
  --ink-300: #bcbaae;

  --shadow-sm: 0 1px 3px rgba(31, 61, 42, 0.08);
  --shadow-md: 0 4px 16px rgba(31, 61, 42, 0.10);
  --shadow-lg: 0 12px 40px rgba(31, 61, 42, 0.14);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;

  --font-jp: 'Noto Sans JP', system-ui, sans-serif;
  --font-display: 'M PLUS Rounded 1c', 'Noto Sans JP', sans-serif;
  --font-en: 'Josefin Sans', 'M PLUS Rounded 1c', sans-serif;
  --font-mono: ui-monospace, 'SF Mono', 'Cascadia Mono', Menlo, monospace;
}

/* Reset / Base */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-jp);
  font-weight: 400;
  color: var(--ink-900);
  background: var(--cream);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
a { color: var(--green-700); text-decoration: none; }
button, input, textarea, select { font: inherit; color: inherit; }

/* ============ Header ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250, 246, 239, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 36px;
  border-bottom: 1px solid rgba(31, 61, 42, 0.08);
}
.logo {
  display: flex;
  align-items: baseline;
  gap: 10px;
  text-decoration: none;
  cursor: pointer;
  transition: opacity 0.2s;
}
.logo:hover { opacity: 0.75; }
.logo-mark { font-size: 24px; }
.logo-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  color: var(--green-900);
  letter-spacing: 0.04em;
}
.logo-en {
  font-family: var(--font-en);
  font-weight: 300;
  font-size: 13px;
  color: var(--ink-500);
  letter-spacing: 0.18em;
  text-transform: lowercase;
}
.nav {
  display: flex;
  align-items: center;
  gap: 28px;
}
.nav a {
  font-size: 14px;
  color: var(--ink-700);
  font-weight: 500;
  transition: color 0.2s;
}
.nav a:hover { color: var(--green-700); }
.nav a.cta {
  background: var(--green-700);
  color: white;
  padding: 8px 18px;
  border-radius: 999px;
  font-weight: 500;
}
.nav a.cta:hover { background: var(--green-900); }

/* ============ Hero ============ */
.hero {
  position: relative;
  padding: 96px 36px 120px;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(250, 246, 239, 0.75) 0%, rgba(250, 246, 239, 0.85) 60%, var(--cream) 100%),
    url('assets/hero-forest.jpg') center/cover no-repeat;
  z-index: -1;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 10% 90%, rgba(45, 90, 61, 0.06) 0 2px, transparent 3px),
    radial-gradient(circle at 22% 85%, rgba(45, 90, 61, 0.04) 0 3px, transparent 4px),
    radial-gradient(circle at 38% 92%, rgba(45, 90, 61, 0.08) 0 2px, transparent 3px),
    radial-gradient(circle at 55% 88%, rgba(45, 90, 61, 0.05) 0 4px, transparent 5px),
    radial-gradient(circle at 75% 90%, rgba(45, 90, 61, 0.07) 0 2px, transparent 3px),
    radial-gradient(circle at 88% 86%, rgba(45, 90, 61, 0.05) 0 3px, transparent 4px);
  pointer-events: none;
  z-index: -1;
}
.hero-inner {
  max-width: 920px;
  margin: 0 auto;
  text-align: center;
}
.hero-eyebrow {
  font-family: var(--font-en);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.3em;
  color: var(--earth-600);
  text-transform: uppercase;
  margin: 0 0 24px;
}
.hero-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(36px, 6vw, 64px);
  line-height: 1.3;
  letter-spacing: 0.02em;
  color: var(--green-900);
  margin: 0 0 28px;
}
.hero-title .accent {
  color: var(--earth-500);
  position: relative;
}
.hero-lead {
  font-size: 17px;
  color: var(--ink-700);
  line-height: 1.9;
  margin: 0 0 40px;
}
.hero-cta-row {
  display: flex;
  gap: 14px;
  justify-content: center;
  margin-bottom: 40px;
  flex-wrap: wrap;
}
.hero-sub {
  font-size: 13px;
  color: var(--ink-500);
  line-height: 1.8;
  margin: 0;
}

/* ============ Buttons ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 12px 28px;
  border-radius: 999px;
  border: none;
  font-family: var(--font-jp);
  font-weight: 500;
  font-size: 15px;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
  white-space: nowrap;
}
.btn-primary {
  background: var(--green-700);
  color: white;
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover {
  background: var(--green-900);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}
.btn-ghost {
  background: transparent;
  color: var(--green-700);
  border: 1.5px solid var(--green-700);
}
.btn-ghost:hover {
  background: var(--green-700);
  color: white;
}
.btn-large { padding: 16px 36px; font-size: 16px; }
.btn-small { padding: 8px 16px; font-size: 13px; }
.btn-full { width: 100%; }

/* ============ Section structure ============ */
.section {
  padding: 96px 36px;
}
.container {
  max-width: 1200px;
  margin: 0 auto;
}
.container.narrow {
  max-width: 720px;
}
.section-eyebrow {
  font-family: var(--font-en);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.3em;
  color: var(--earth-600);
  text-transform: uppercase;
  margin: 0 0 14px;
}
.section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 3.5vw, 38px);
  line-height: 1.5;
  color: var(--green-900);
  margin: 0 0 16px;
}
.section-lead {
  font-size: 16px;
  color: var(--ink-700);
  line-height: 1.9;
  margin: 0 0 48px;
}

/* ============ About cards ============ */
.about { background: var(--paper); }
.concept-figure {
  margin: 0 0 48px;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  text-align: center;
  background: var(--cream);
}
.concept-figure img {
  width: 100%;
  height: auto;
  display: block;
}
.concept-figure figcaption {
  padding: 16px 24px;
  font-size: 13px;
  color: var(--ink-700);
  line-height: 1.8;
}
.cert-mark-img {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--cream);
  padding: 4px;
}
.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 28px;
}
.about-card {
  background: var(--cream);
  padding: 36px 28px;
  border-radius: var(--radius-md);
  transition: transform 0.3s, box-shadow 0.3s;
}
.about-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.about-icon { font-size: 36px; margin-bottom: 12px; }
.about-card h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--green-900);
  margin: 0 0 12px;
}
.about-card p {
  font-size: 14.5px;
  color: var(--ink-700);
  line-height: 1.85;
  margin: 0;
}

/* ============ Form ============ */
.step-form { background: var(--cream); }
.form {
  background: var(--paper);
  padding: 48px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  gap: 28px;
}
.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.field-label {
  font-size: 14px;
  font-weight: 500;
  color: var(--green-900);
}
.value-display {
  color: var(--earth-500);
  font-weight: 700;
  margin-left: 8px;
  font-family: var(--font-display);
}
.field input[type="text"],
.field select,
.field textarea {
  background: var(--cream);
  border: 1.5px solid var(--ink-300);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 15px;
  transition: border-color 0.2s, background 0.2s;
}
.field input[type="text"]:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--green-700);
  background: var(--paper);
}
.field textarea {
  resize: vertical;
  min-height: 80px;
  font-family: inherit;
}
.field input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: linear-gradient(to right, var(--green-700) 0%, var(--green-300) 100%);
  outline: none;
}
.field input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--earth-500);
  border: 3px solid white;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
}
.field input[type="range"]::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--earth-500);
  border: 3px solid white;
  cursor: pointer;
}
.range-hints {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--ink-500);
  margin-top: 4px;
}

/* ============ Candidates ============ */
.step-candidates { background: var(--paper); }
.candidates-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}
@media (max-width: 900px) {
  .candidates-layout { grid-template-columns: 1fr; }
}
.candidates-map {
  height: 580px;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  background: var(--green-100);
}
.candidates-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-height: 580px;
  overflow-y: auto;
  padding-right: 8px;
}
.candidate {
  background: var(--cream);
  padding: 22px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s;
  border: 2px solid transparent;
}
.candidate:hover {
  background: var(--paper);
  border-color: var(--green-300);
  transform: translateX(2px);
  box-shadow: var(--shadow-sm);
}
.candidate.selected {
  background: var(--paper);
  border-color: var(--green-700);
  box-shadow: var(--shadow-md);
}
.candidate-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 8px;
}
.candidate-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--green-900);
  margin: 0;
}
.candidate-pref {
  font-size: 12px;
  color: var(--ink-500);
}
.candidate-meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px 14px;
  margin: 10px 0;
  font-size: 13px;
}
.candidate-meta dt {
  color: var(--ink-500);
  font-weight: 400;
}
.candidate-meta dd {
  margin: 0;
  color: var(--ink-900);
  font-weight: 500;
}
.candidate-co2 {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 12px 0 6px;
  padding-top: 12px;
  border-top: 1px dashed var(--ink-300);
}
.candidate-co2 .co2-num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 24px;
  color: var(--green-700);
}
.candidate-co2 .co2-unit {
  font-size: 12px;
  color: var(--ink-500);
}
.candidate-credit {
  font-size: 12px;
  color: var(--earth-600);
  font-weight: 500;
}
.candidate-cta {
  margin-top: 12px;
  font-size: 13px;
  color: var(--green-700);
  font-weight: 500;
}

/* ============ Deep dive ============ */
.step-deepdive { background: var(--cream); }
.dd-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 32px;
  align-items: start;
}
@media (max-width: 1000px) {
  .dd-grid { grid-template-columns: 1fr; }
}
.dd-satellite-frame {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--green-700);
  box-shadow: var(--shadow-lg);
  margin-bottom: 24px;
}
.dd-map {
  height: 480px;
  width: 100%;
}
.dd-satellite-overlay {
  position: absolute;
  bottom: 16px;
  left: 16px;
  z-index: 1000;
}
.dd-stamp {
  background: rgba(31, 61, 42, 0.85);
  color: var(--green-100);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  backdrop-filter: blur(4px);
}
.stamp-row {
  display: flex;
  gap: 14px;
  align-items: baseline;
}
.stamp-label {
  display: inline-block;
  min-width: 60px;
  color: var(--earth-300);
  font-weight: 500;
}
.timeline {
  background: var(--paper);
  padding: 20px 22px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}
.timeline-label {
  font-size: 13px;
  color: var(--ink-700);
  margin: 0 0 8px;
  font-weight: 500;
}
.timeline-svg {
  width: 100%;
  height: 80px;
  display: block;
}
.timeline-axis {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--ink-500);
  margin-top: 4px;
}
.dd-side {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.metric-card {
  background: var(--paper);
  padding: 22px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}
.metric-card.highlight {
  background: var(--green-700);
  color: var(--cream);
}
.metric-card.highlight .metric-label { color: var(--green-100); }
.metric-card.highlight .metric-error { color: var(--green-300); }
.metric-label {
  font-size: 12px;
  color: var(--ink-500);
  margin: 0 0 6px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: 500;
}
.metric-value {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 36px;
  color: inherit;
  margin: 0 0 4px;
  line-height: 1.1;
}
.metric-unit {
  font-size: 14px;
  font-weight: 500;
  margin-left: 4px;
}
.metric-error {
  font-size: 12px;
  color: var(--ink-500);
  margin: 0;
}
.metric-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.metric-list li {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  border-bottom: 1px dashed var(--ink-300);
  font-size: 14px;
}
.metric-list li:last-child { border-bottom: none; }
.metric-list li > span:first-child { color: var(--ink-500); }
.metric-list li > span:last-child { color: var(--ink-900); font-weight: 500; }
.metric-list.small li { font-size: 13px; padding: 4px 0; }

/* ============ Certificate ============ */
.step-commit { background: var(--paper); }
.certificate {
  background: var(--cream);
  border: 2px solid var(--green-700);
  border-radius: var(--radius-lg);
  padding: 48px;
  box-shadow: var(--shadow-lg);
  position: relative;
}
.certificate::before {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid var(--green-300);
  border-radius: 16px;
  pointer-events: none;
}
.cert-header {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 18px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--ink-300);
  margin-bottom: 28px;
}
.cert-mark { font-size: 40px; }
.cert-en {
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: 0.25em;
  color: var(--earth-600);
  margin: 0;
  text-transform: uppercase;
  font-weight: 500;
}
.cert-jp {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
  color: var(--green-900);
  margin: 2px 0 0;
}
.cert-no {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-500);
}
.cert-statement {
  font-size: 16px;
  line-height: 2;
  color: var(--ink-900);
  margin: 0 0 28px;
}
.cert-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 32px;
}
.cert-table th,
.cert-table td {
  text-align: left;
  padding: 12px 0;
  border-bottom: 1px dashed var(--ink-300);
  font-size: 14px;
}
.cert-table th {
  color: var(--ink-500);
  font-weight: 500;
  width: 38%;
  vertical-align: top;
}
.cert-table td {
  color: var(--ink-900);
  font-weight: 500;
}
.cert-sub {
  font-size: 12px;
  color: var(--ink-500);
  font-weight: 400;
  margin-left: 6px;
}
.cert-hash-block {
  background: var(--green-900);
  color: var(--green-100);
  padding: 20px 24px;
  border-radius: var(--radius-sm);
  margin-bottom: 24px;
}
.cert-hash-title {
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--earth-300);
  margin: 0 0 12px;
  text-transform: uppercase;
}
.cert-hash-row {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  padding: 4px 0;
  font-family: var(--font-mono);
}
.cert-hash-row > span:first-child {
  color: var(--green-300);
  font-family: var(--font-jp);
}
.cert-disclaimer {
  font-size: 11px;
  color: var(--ink-500);
  line-height: 1.7;
  margin: 0 0 20px;
}
.cert-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  border-top: 1px solid var(--ink-300);
  flex-wrap: wrap;
  gap: 12px;
}
.cert-issuer {
  font-family: var(--font-display);
  font-size: 13px;
  color: var(--ink-700);
  margin: 0;
}
.next-steps {
  text-align: center;
  margin-top: 32px;
}

/* ============ Technology ============ */
.technology { background: var(--green-900); color: var(--cream); }
.technology .section-title { color: var(--cream); }
.technology .section-eyebrow { color: var(--earth-300); }
.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 28px;
  margin-top: 32px;
}
.tech-step h3 {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--green-100);
  margin: 16px 0 12px;
  font-size: 17px;
}
.tech-step p {
  font-size: 14px;
  line-height: 1.9;
  color: var(--green-300);
  margin: 0;
}
.tech-num {
  font-family: var(--font-en);
  font-size: 32px;
  font-weight: 300;
  color: var(--earth-300);
}

/* ============ Footer ============ */
.site-footer {
  background: var(--ink-900);
  color: var(--ink-300);
  padding: 60px 36px 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1.4fr;
  gap: 40px;
  margin-bottom: 40px;
}
@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr; }
}
.footer-logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--cream);
  margin: 0 0 8px;
}
.footer-tag {
  font-size: 13px;
  margin: 0;
  line-height: 1.8;
}
.footer-heading {
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--earth-300);
  margin: 0 0 12px;
}
.site-footer ul {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 13px;
  line-height: 2;
}
.site-footer .small { font-size: 13px; line-height: 1.85; margin: 0; }
.copyright {
  font-size: 11px;
  text-align: center;
  color: var(--ink-500);
  padding-top: 28px;
  border-top: 1px solid #3a382a;
  margin: 0;
}

/* ============ Utility ============ */
.mono { font-family: var(--font-mono); }

/* ============ Print (certificate) ============ */
@media print {
  body { background: white; }
  .site-header, .site-footer, .section:not(#commit) { display: none; }
  #commit { padding: 20px; }
  .certificate { box-shadow: none; border-color: var(--green-700); }
  .next-steps { display: none; }
  .cert-footer .btn { display: none; }
}

/* ============ Animations ============ */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}
.section:not([hidden]) { animation: fadeIn 0.5s ease-out; }

/* Hidden helper for revealed sections */
section[hidden] { display: none !important; }