:root {
  --color-navy: #0c1b33;
  --color-navy-light: #162a4a;
  --color-accent: #1267d8;
  --color-accent-hover: #0e52ad;
  --color-accent-soft: #eef5ff;
  --color-bg: #ffffff;
  --color-bg-alt: #f6f8fb;
  --color-border: #dce3ee;
  --color-text: #1a2433;
  --color-text-sub: #4a586e;
  --color-text-muted: #6e7d94;
  --color-basic: #1e3a5f;
  --color-energy: #1267d8;
  --color-renewable: #5b9bd5;
  --color-error-bg: #fdf6f6;
  --color-error-border: #e6b8b8;
  --color-error-text: #8c2d2d;
  --shadow-sm: 0 2px 6px rgba(12, 27, 51, 0.05);
  --shadow-md: 0 8px 24px rgba(12, 27, 51, 0.08);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.75;
  overflow-x: hidden;
}

h1, h2, h3, h4, p {
  margin-top: 0;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

video {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  background-color: #0f1c30;
}

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  text-align: center;
  border-radius: var(--radius-sm);
  padding: 12px 22px;
  font-size: 0.95rem;
  line-height: 1.4;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.1s ease;
  border: none;
  text-decoration: none;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background-color: var(--color-accent);
  color: #ffffff;
}

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

.btn-lg {
  padding: 15px 30px;
  font-size: 1.05rem;
}

/* 1. Header */
.site-header {
  background-color: var(--color-navy);
  color: #ffffff;
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 12px;
}

.brand-logo {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: #ffffff;
  white-space: nowrap;
}

.btn-header {
  background-color: var(--color-accent);
  color: #ffffff;
  padding: 9px 16px;
  font-size: 0.875rem;
}

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

/* 2. Hero */
.hero {
  padding: 64px 0 72px;
  background: linear-gradient(180deg, #f4f7fc 0%, #ffffff 100%);
  border-bottom: 1px solid var(--color-border);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 44px;
  align-items: center;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-accent);
  background-color: var(--color-accent-soft);
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 16px;
}

.hero h1 {
  font-size: 2.15rem;
  line-height: 1.35;
  color: var(--color-navy);
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}

.hero-sub {
  font-size: 1.05rem;
  color: var(--color-text-sub);
  margin-bottom: 28px;
}

.video-frame {
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
  background-color: var(--color-navy);
}

/* Sections */
.section {
  padding: 76px 0;
}

.section-alt {
  background-color: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section-header {
  max-width: 760px;
  margin: 0 auto 48px;
  text-align: center;
}

.section-label {
  display: block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.section-header h2 {
  font-size: 1.75rem;
  line-height: 1.4;
  color: var(--color-navy);
  margin-bottom: 12px;
}

.section-lead {
  color: var(--color-text-sub);
  font-size: 1rem;
  margin-bottom: 0;
}

/* 3. Issue Cards */
.card-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.issue-card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  box-shadow: var(--shadow-sm);
}

.issue-number {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 10px;
  letter-spacing: 0.08em;
}

.issue-card h3 {
  font-size: 1.18rem;
  color: var(--color-navy);
  margin-bottom: 12px;
  line-height: 1.45;
}

.issue-card p {
  color: var(--color-text-sub);
  font-size: 0.94rem;
  margin-bottom: 0;
}

/* 4. Facility Sections */
.facility-list {
  display: flex;
  flex-direction: column;
  gap: 56px;
}

.facility-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-sm);
}

.facility-item-reverse .facility-content {
  order: 2;
}

.facility-item-reverse .facility-video {
  order: 1;
}

.facility-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  text-transform: uppercase;
  margin-bottom: 6px;
}

.facility-content h3 {
  font-size: 1.45rem;
  color: var(--color-navy);
  margin-bottom: 20px;
}

.facility-block {
  margin-bottom: 16px;
}

.facility-block:last-child {
  margin-bottom: 0;
}

.facility-block h4 {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 6px;
  font-weight: 700;
}

.facility-block p {
  font-size: 0.95rem;
  color: var(--color-text-sub);
  margin-bottom: 0;
}

.highlight-box {
  background-color: var(--color-accent-soft);
  border-left: 4px solid var(--color-accent);
  padding: 16px 18px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.highlight-box h4 {
  color: var(--color-accent);
}

.highlight-box p {
  color: var(--color-text);
}

/* 5. Quick Simulator */
.sim-card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-md);
  max-width: 920px;
  margin: 0 auto;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 24px;
}

.form-group {
  display: flex;
  flex-direction: column;
}

.form-group label {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.unit-badge {
  font-size: 0.75rem;
  font-weight: 600;
  background-color: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  color: var(--color-text-sub);
  padding: 1px 6px;
  border-radius: 4px;
}

.form-group select,
.form-group input {
  width: 100%;
  padding: 12px 14px;
  font-size: 1rem;
  color: var(--color-text);
  background-color: #ffffff;
  border: 1px solid #bfcce0;
  border-radius: var(--radius-sm);
  font-family: inherit;
}

.form-group select:focus,
.form-group input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(18, 103, 216, 0.15);
}

.form-actions {
  text-align: center;
}

.sim-error {
  margin-top: 16px;
  margin-bottom: 0;
  padding: 12px 16px;
  background-color: var(--color-error-bg);
  border: 1px solid var(--color-error-border);
  color: var(--color-error-text);
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  text-align: center;
}

.sim-result {
  margin-top: 36px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

.result-summary {
  display: grid;
  grid-template-columns: 1.4fr 0.6fr;
  gap: 20px;
  background-color: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 28px;
}

.result-caption {
  display: block;
  font-size: 0.85rem;
  color: var(--color-text-sub);
  font-weight: 600;
  margin-bottom: 4px;
}

.result-total-amount {
  font-size: 2.1rem;
  font-weight: 700;
  color: var(--color-navy);
  line-height: 1.2;
}

.result-load {
  border-left: 1px solid var(--color-border);
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.result-load-value {
  font-size: 1.65rem;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1.2;
}

.composition-block {
  margin-bottom: 28px;
}

.composition-header h3 {
  font-size: 1rem;
  color: var(--color-navy);
  margin-bottom: 12px;
}

.stacked-bar {
  display: flex;
  width: 100%;
  height: 26px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background-color: #e9eef5;
  margin-bottom: 20px;
}

.bar-segment {
  height: 100%;
  transition: width 0.35s ease;
}

.bar-basic {
  background-color: var(--color-basic);
}

.bar-energy {
  background-color: var(--color-energy);
}

.bar-renewable {
  background-color: var(--color-renewable);
}

.breakdown-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.breakdown-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  background-color: #ffffff;
}

.breakdown-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--color-text-sub);
  margin-bottom: 6px;
}

.breakdown-ratio {
  margin-left: auto;
  font-weight: 700;
  color: var(--color-navy);
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.dot-basic {
  background-color: var(--color-basic);
}

.dot-energy {
  background-color: var(--color-energy);
}

.dot-renewable {
  background-color: var(--color-renewable);
}

.breakdown-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: 4px;
}

.breakdown-formula {
  font-size: 0.76rem;
  color: var(--color-text-muted);
}

.insight-box {
  background-color: var(--color-accent-soft);
  border: 1px solid #c5dcfa;
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin-bottom: 20px;
}

.insight-title {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 6px;
}

.insight-text {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-navy);
  margin-bottom: 0;
}

.sim-note {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 24px;
  text-align: center;
}

.result-cta {
  text-align: center;
}

/* 6. Features */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 36px;
}

.feature-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 26px;
  background-color: var(--color-bg);
  box-shadow: var(--shadow-sm);
}

.feature-card h3 {
  font-size: 1.12rem;
  color: var(--color-navy);
  margin-bottom: 10px;
  padding-left: 14px;
  border-left: 3px solid var(--color-accent);
}

.feature-card p {
  font-size: 0.94rem;
  color: var(--color-text-sub);
  margin-bottom: 0;
}

.beta-banner {
  background-color: var(--color-navy);
  color: #ffffff;
  border-radius: var(--radius-lg);
  padding: 32px 36px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.beta-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  background-color: rgba(255, 255, 255, 0.14);
  color: #9ec5ff;
  padding: 4px 10px;
  border-radius: 4px;
  margin-bottom: 10px;
}

.beta-text {
  font-size: 1rem;
  margin-bottom: 0;
  color: #e8eef7;
}

.beta-banner-action {
  flex-shrink: 0;
}

/* 7. Credit */
.section-credit {
  padding: 56px 0;
  background-color: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
}

.credit-box {
  max-width: 780px;
  margin: 0 auto;
  text-align: center;
}

.credit-heading {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: 12px;
}

.credit-description {
  font-size: 0.94rem;
  color: var(--color-text-sub);
  margin-bottom: 16px;
}

.credit-link-wrap {
  margin-bottom: 0;
}

.credit-link {
  font-size: 0.94rem;
  font-weight: 600;
  color: var(--color-accent);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.credit-link:hover {
  border-bottom-color: var(--color-accent);
}

/* 8. Footer */
.site-footer {
  background-color: var(--color-navy);
  color: #b0bdd0;
  padding: 40px 0 32px;
  font-size: 0.8rem;
}

.disclaimer-list {
  list-style: none;
  padding: 0;
  margin: 0 0 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.disclaimer-list li {
  position: relative;
  padding-left: 1.1em;
  line-height: 1.6;
}

.disclaimer-list li::before {
  content: "※";
  position: absolute;
  left: 0;
  top: 0;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 20px;
  text-align: center;
  color: #8494ab;
}

/* Responsive */
@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .card-grid-3 {
    grid-template-columns: 1fr;
  }

  .facility-item {
    grid-template-columns: 1fr;
    padding: 24px;
    gap: 24px;
  }

  .facility-item-reverse .facility-content {
    order: 1;
  }

  .facility-item-reverse .facility-video {
    order: 2;
  }

  .form-grid,
  .breakdown-grid,
  .feature-grid {
    grid-template-columns: 1fr;
  }

  .result-summary {
    grid-template-columns: 1fr;
  }

  .result-load {
    border-left: none;
    border-top: 1px solid var(--color-border);
    padding-left: 0;
    padding-top: 16px;
  }

  .beta-banner {
    flex-direction: column;
    align-items: flex-start;
    padding: 24px;
  }

  .beta-banner-action,
  .beta-banner-action .btn {
    width: 100%;
  }
}

@media (max-width: 600px) {
  .container {
    padding: 0 16px;
  }

  .header-inner {
    min-height: 60px;
  }

  .brand-logo {
    font-size: 0.92rem;
  }

  .btn-header {
    padding: 8px 12px;
    font-size: 0.78rem;
  }

  .hero {
    padding: 40px 0 48px;
  }

  .hero h1 {
    font-size: 1.6rem;
  }

  .section {
    padding: 52px 0;
  }

  .section-header h2 {
    font-size: 1.4rem;
  }

  .sim-card {
    padding: 22px 18px;
  }

  .result-total-amount {
    font-size: 1.7rem;
  }

  .btn-lg {
    width: 100%;
    padding: 14px 20px;
    font-size: 0.98rem;
  }
}