/* ============================================
   dxforth.jp — Takram-inspired Design System
   ============================================ */

/* --- Reset & Base --- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-text: #1a1a1a;
  --color-text-secondary: #6b6b6b;
  --color-text-tertiary: #999;
  --color-accent: #0055ff;
  --color-accent-soft: #e8efff;
  --color-border: #e8e8e8;
  --color-dark: #111;
  --color-green: #00a870;
  --color-purple: #6b3fa0;
  --color-orange: #e07020;
  --font-sans: "Noto Sans JP", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-display: "Noto Sans JP", sans-serif;
  --ease-out: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-out-expo: cubic-bezier(0.19, 1, 0.22, 1);
  --max-width: 1200px;
  --section-padding: clamp(80px, 10vw, 140px);
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.8;
  letter-spacing: 0.02em;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul { list-style: none; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 clamp(24px, 5vw, 60px);
}

/* --- Reveal Animation --- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s var(--ease-out-expo), transform 0.8s var(--ease-out-expo);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* --- Header --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(250, 250, 250, 0.9);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease;
}

.header.scrolled {
  border-bottom-color: var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 clamp(24px, 5vw, 60px);
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-text);
}

.logo span {
  color: var(--color-accent);
}

.nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav a {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color 0.3s ease;
  letter-spacing: 0.04em;
}

.nav a:hover {
  color: var(--color-text);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  background: var(--color-text);
  color: #fff !important;
  border-radius: 100px;
  font-size: 0.8125rem;
  font-weight: 500;
  transition: background 0.3s ease, transform 0.2s ease;
}

.nav-cta:hover {
  background: var(--color-accent);
  transform: translateY(-1px);
}

/* Mobile menu */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 32px;
  height: 32px;
  position: relative;
}

.menu-toggle span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--color-text);
  position: absolute;
  left: 6px;
  transition: all 0.3s ease;
}

.menu-toggle span:nth-child(1) { top: 10px; }
.menu-toggle span:nth-child(2) { top: 15px; }
.menu-toggle span:nth-child(3) { top: 20px; }

.menu-toggle.active span:nth-child(1) {
  top: 15px;
  transform: rotate(45deg);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  top: 15px;
  transform: rotate(-45deg);
}

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 72px;
  position: relative;
  overflow: hidden;
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 24px;
  padding: 6px 16px;
  border: 1px solid var(--color-accent);
  border-radius: 100px;
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 28px;
  max-width: 14em;
}

.hero h1 em {
  font-style: normal;
  color: var(--color-accent);
}

.hero-description {
  font-size: clamp(1rem, 1.5vw, 1.2rem);
  color: var(--color-text-secondary);
  line-height: 2;
  max-width: 36em;
  margin-bottom: 48px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-bg-element {
  position: absolute;
  right: -10%;
  top: 50%;
  transform: translateY(-50%);
  width: 50vw;
  height: 50vw;
  max-width: 600px;
  max-height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--color-accent-soft) 0%, transparent 70%);
  opacity: 0.5;
  z-index: 1;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 36px;
  border-radius: 100px;
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  transition: all 0.3s var(--ease-out);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--color-text);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 85, 255, 0.2);
}

.btn-outline {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-outline:hover {
  border-color: var(--color-text);
  transform: translateY(-2px);
}

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

.btn-accent:hover {
  background: #0044cc;
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 85, 255, 0.25);
}

.btn-white {
  background: #fff;
  color: var(--color-text);
}

.btn-white:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}

.btn-arrow::after {
  content: "\2192";
  transition: transform 0.3s ease;
}

.btn-arrow:hover::after {
  transform: translateX(4px);
}

/* --- Section --- */
.section {
  padding: var(--section-padding) 0;
}

.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin-bottom: 20px;
}

.section-description {
  font-size: clamp(0.9375rem, 1.2vw, 1.0625rem);
  color: var(--color-text-secondary);
  line-height: 2;
  max-width: 40em;
}

.section-header {
  margin-bottom: clamp(48px, 6vw, 80px);
}

/* --- Stats Row --- */
.stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  overflow: hidden;
}

.stat-card {
  background: var(--color-surface);
  padding: clamp(32px, 4vw, 56px);
  text-align: center;
}

.stat-number {
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  margin-bottom: 4px;
}

.stat-number .accent {
  color: var(--color-accent);
}

.stat-unit {
  font-size: 0.75em;
  font-weight: 700;
}

.stat-label {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  letter-spacing: 0.04em;
}

/* --- Feature Grid --- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: clamp(32px, 3vw, 48px);
  transition: transform 0.4s var(--ease-out), box-shadow 0.4s var(--ease-out);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.06);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  margin-bottom: 20px;
  color: #fff;
}

.feature-icon.blue { background: var(--color-accent); }
.feature-icon.green { background: var(--color-green); }
.feature-icon.purple { background: var(--color-purple); }
.feature-icon.orange { background: var(--color-orange); }

.feature-card h3 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: 0.01em;
}

.feature-card p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.9;
}

.feature-card ul {
  margin-top: 16px;
}

.feature-card ul li {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  padding: 6px 0;
  padding-left: 20px;
  position: relative;
}

.feature-card ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
}

/* --- Service Cards (4-col) --- */
.service-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.service-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: clamp(28px, 3vw, 40px);
  transition: transform 0.4s var(--ease-out), box-shadow 0.4s var(--ease-out);
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.06);
}

.service-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.service-card p {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  line-height: 1.9;
}

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

.subsidy-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  overflow: hidden;
  transition: transform 0.4s var(--ease-out), box-shadow 0.4s var(--ease-out);
}

.subsidy-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.08);
}

.subsidy-card-visual {
  height: 180px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.subsidy-card-visual.gradient-blue {
  background: linear-gradient(135deg, #0055ff, #4488ff);
}

.subsidy-card-visual.gradient-green {
  background: linear-gradient(135deg, #00a870, #44cc99);
}

.subsidy-card-visual.gradient-purple {
  background: linear-gradient(135deg, #6b3fa0, #9966cc);
}

.subsidy-card-visual .amount {
  color: #fff;
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  font-weight: 900;
  text-align: center;
  line-height: 1.4;
}

.subsidy-card-visual .amount small {
  display: block;
  font-size: 0.5em;
  font-weight: 500;
  opacity: 0.8;
  letter-spacing: 0.08em;
}

.subsidy-card-body {
  padding: clamp(24px, 3vw, 36px);
}

.subsidy-card-body h3 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.subsidy-card-body .rate {
  font-size: 0.875rem;
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: 12px;
}

.subsidy-card-body p {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 20px;
}

.subsidy-card-body .link {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-accent);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap 0.3s ease;
}

.subsidy-card-body .link:hover {
  gap: 10px;
}

/* --- Steps --- */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
  counter-reset: step;
}

.step {
  position: relative;
  counter-increment: step;
}

.step::before {
  content: counter(step, decimal-leading-zero);
  font-size: 3rem;
  font-weight: 900;
  color: var(--color-accent-soft);
  line-height: 1;
  margin-bottom: 16px;
  display: block;
}

.step h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.step p {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

/* --- Case Studies --- */
.case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.case-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: clamp(28px, 3vw, 40px);
}

.case-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent);
  padding: 4px 12px;
  background: var(--color-accent-soft);
  border-radius: 100px;
  margin-bottom: 16px;
}

.case-card h3 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.case-meta {
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
  margin-bottom: 12px;
}

.case-card p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}

.case-result {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-accent);
}

/* --- Diagnosis (Quiz) --- */
.diagnosis {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: clamp(40px, 5vw, 64px);
  text-align: center;
}

.diagnosis h3 {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.diagnosis-step-label {
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
  margin-bottom: 24px;
}

.diagnosis-question {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 32px;
}

.diagnosis-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  max-width: 640px;
  margin: 0 auto;
}

.diagnosis-option {
  padding: 16px 20px;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  background: var(--color-bg);
}

.diagnosis-option:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
}

.diagnosis-option.selected {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: #fff;
}

.diagnosis-progress {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-bottom: 32px;
}

.diagnosis-progress .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-border);
  transition: background 0.3s ease;
}

.diagnosis-progress .dot.active {
  background: var(--color-accent);
}

.diagnosis-result {
  display: none;
  text-align: center;
}

.diagnosis-result.show {
  display: block;
}

.diagnosis-result h4 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.diagnosis-result p {
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

/* --- Checklist --- */
.checklist {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  max-width: 640px;
}

.checklist-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  font-size: 0.9375rem;
}

.checklist-item .check {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-green);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 0.625rem;
  margin-top: 2px;
}

/* --- CTA Section --- */
.cta-section {
  background: var(--color-dark);
  color: #fff;
  padding: var(--section-padding) 0;
  text-align: center;
}

.cta-section .section-label {
  color: rgba(255, 255, 255, 0.5);
}

.cta-section h2 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.cta-section p {
  color: rgba(255, 255, 255, 0.6);
  font-size: 1rem;
  margin-bottom: 40px;
  max-width: 32em;
  margin-left: auto;
  margin-right: auto;
}

.cta-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.cta-phone {
  display: flex;
  align-items: center;
  gap: 12px;
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.875rem;
  margin-top: 24px;
  justify-content: center;
}

.cta-phone .number {
  font-size: 1.125rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.04em;
}

/* --- Footer --- */
.footer {
  background: var(--color-dark);
  color: rgba(255, 255, 255, 0.5);
  padding: 64px 0 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand .logo {
  color: #fff;
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 0.8125rem;
  line-height: 1.9;
}

.footer h4 {
  color: #fff;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  margin-bottom: 20px;
}

.footer-links a {
  display: block;
  font-size: 0.8125rem;
  padding: 4px 0;
  transition: color 0.3s ease;
}

.footer-links a:hover {
  color: #fff;
}

.footer-contact p {
  font-size: 0.8125rem;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.75rem;
  text-align: center;
}

/* --- Support Section --- */
.support-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.support-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: clamp(28px, 3vw, 40px);
}

.support-card h3 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.support-card ul li {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  padding: 6px 0;
  padding-left: 20px;
  position: relative;
}

.support-card ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-green);
}

/* --- Requirements --- */
.requirements-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

/* --- Category Grid (4-col for shinki) --- */
.category-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .nav { display: none; }
  .menu-toggle { display: block; }

  .nav.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg);
    padding: 40px;
    gap: 24px;
    z-index: 99;
  }

  .nav.open a {
    font-size: 1.125rem;
  }

  .feature-grid,
  .subsidy-grid,
  .case-grid {
    grid-template-columns: 1fr;
  }

  .service-grid,
  .category-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stats-row {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .hero-bg-element {
    display: none;
  }

  .support-grid,
  .checklist,
  .requirements-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .service-grid,
  .category-grid {
    grid-template-columns: 1fr;
  }

  .steps {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    flex-direction: column;
  }

  .btn {
    justify-content: center;
    width: 100%;
  }

  .cta-actions {
    flex-direction: column;
    align-items: center;
  }
}