/* ===========================================================================
   ArigatoAI Official Landing Page
   Theme: warm, gentle, and consistent with the mental coach experience
   =========================================================================== */

:root {
  /* Warm foundation */
  --bg-app: #f9f7f4;
  --bg-gradient-top: #fbf9f6;
  --bg-gradient-bottom: #f2ede6;
  --card-bg: rgba(255, 255, 255, 0.92);
  --card-bg-hover: rgba(255, 255, 255, 0.98);
  --card-bg-subtle: #f7f3ed;
  --card-border: rgba(226, 220, 210, 0.9);
  --card-border-hover: rgba(67, 110, 89, 0.58);
  --card-shadow: 0 12px 32px -4px rgba(78, 64, 52, 0.08), 0 4px 12px -2px rgba(78, 64, 52, 0.04);
  --card-shadow-hover: 0 20px 40px -4px rgba(78, 64, 52, 0.12), 0 8px 16px -4px rgba(78, 64, 52, 0.06);

  /* Brand and text */
  --primary-color: #436e59;
  --primary-hover: #375b49;
  --primary-light: #e8f1ec;
  --primary-glow: rgba(67, 110, 89, 0.25);
  --accent-terracotta: #cf6f56;
  --accent-terracotta-strong: #9a503e;
  --accent-warm-gold: #c69255;
  --accent-gold-light: #fcf6ee;
  --text-primary: #2c3330;
  --text-secondary: #5e6863;
  --text-small: #646e69;
  --text-on-primary: #ffffff;
  --focus-ring: #375b49;

  /* Type, shape, and motion */
  --font-family: "Zen Maru Gothic", "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Hiragino Sans", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  --font-latin: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --transition-smooth: all 0.26s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  min-height: 100%;
  color: var(--text-primary);
  background: linear-gradient(175deg, var(--bg-gradient-top) 0%, var(--bg-app) 50%, var(--bg-gradient-bottom) 100%);
  background-attachment: fixed;
  font-family: var(--font-family);
  line-height: 1.7;
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body {
  display: flex;
  min-height: 100vh;
  flex-direction: column;
  overflow-x: hidden;
  color: var(--text-primary);
  background: transparent;
}

main {
  flex: 1;
}

/* Accessibility */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  z-index: 9999;
  border-radius: var(--radius-sm);
  background: var(--primary-color);
  color: var(--text-on-primary);
  padding: 0.75rem 1.25rem;
  font-weight: 700;
  text-decoration: none;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 1rem;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 3px;
}

/* Layout utilities */
.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 5rem 0;
  scroll-margin-top: 1rem;
}

.mobile-only {
  display: none;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(226, 220, 210, 0.78);
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.header-container {
  display: flex;
  max-width: 1120px;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  margin: 0 auto;
  padding: 1rem 1.5rem;
}

.header-cta,
.header-language,
.coach-language-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.header-language,
.coach-language-switch {
  color: var(--text-muted);
  font-family: var(--font-latin);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.language-link {
  border-radius: 0.35rem;
  color: var(--text-secondary);
  padding: 0.2rem 0.25rem;
  text-decoration: none;
}

.language-link:hover,
.language-link:focus-visible,
.language-link[aria-current="page"] {
  background: var(--primary-light);
  color: var(--primary-color);
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-primary);
  font-family: var(--font-latin);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.brand-logo .logo-icon {
  font-size: 1.35rem;
}

.site-nav .nav-list {
  display: flex;
  gap: 1.75rem;
  list-style: none;
}

.nav-link {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  transition: color 0.2s ease;
}

.nav-link:hover {
  color: var(--primary-color);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border: 1px solid transparent;
  border-radius: var(--radius-full);
  cursor: pointer;
  font-family: var(--font-family);
  font-weight: 700;
  text-decoration: none;
  transition: var(--transition-smooth);
  white-space: nowrap;
}

.btn-sm {
  padding: 0.5rem 1.125rem;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 0.875rem 1.75rem;
  font-size: 1rem;
}

.btn-block {
  width: 100%;
}

.btn-primary {
  border-color: var(--primary-color);
  background: var(--primary-color);
  box-shadow: 0 5px 16px rgba(67, 110, 89, 0.22);
  color: var(--text-on-primary);
}

.btn-primary:hover {
  border-color: var(--primary-hover);
  background: var(--primary-hover);
  box-shadow: 0 8px 20px rgba(67, 110, 89, 0.3);
  transform: translateY(-1px);
}

.btn-outline {
  border-color: var(--primary-color);
  background: rgba(255, 255, 255, 0.74);
  color: var(--primary-color);
}

.btn-outline:hover {
  border-color: var(--primary-hover);
  background: var(--primary-light);
  color: var(--primary-hover);
  transform: translateY(-1px);
}

/* Hero */
.hero-section {
  position: relative;
  overflow: hidden;
  padding: 6rem 0 5rem;
  text-align: center;
}

.hero-background-glow,
.hero-background-glow::before {
  position: absolute;
  pointer-events: none;
}

.hero-background-glow {
  top: 3%;
  left: 50%;
  width: min(760px, 100vw);
  height: 430px;
  transform: translateX(-50%);
  background: radial-gradient(ellipse at 35% 48%, rgba(67, 110, 89, 0.14) 0%, rgba(67, 110, 89, 0.07) 28%, transparent 67%);
  filter: blur(24px);
  z-index: 0;
}

.hero-background-glow::before {
  top: 20px;
  right: -105px;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-warm-gold) 0%, transparent 70%);
  content: "";
  opacity: 0.12;
}

.hero-container {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.status-badge-wrapper {
  margin-bottom: 1.75rem;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: 1px solid rgba(67, 110, 89, 0.38);
  border-radius: var(--radius-full);
  background: var(--primary-light);
  color: var(--primary-hover);
  font-family: var(--font-latin);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  padding: 0.375rem 1rem;
}

.badge-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(67, 110, 89, 0.13);
}

.hero-title {
  max-width: 800px;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
  font-size: 2.75rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.3;
}

.hero-lead {
  max-width: 680px;
  margin-bottom: 2.5rem;
  color: var(--text-secondary);
  font-size: 1.125rem;
  line-height: 1.85;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

/* Shared section presentation */
.section-header {
  max-width: 640px;
  margin: 0 auto 3.5rem;
  text-align: center;
}

.section-tag {
  display: inline-block;
  margin-bottom: 0.75rem;
  color: var(--primary-color);
  font-family: var(--font-latin);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.section-title {
  margin-bottom: 1rem;
  color: var(--text-primary);
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.75;
}

/* About and feature cards */
.features-grid,
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.feature-card {
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  background: var(--card-bg);
  box-shadow: 0 10px 28px -4px rgba(78, 64, 52, 0.06);
  padding: 2rem 1.75rem;
  transition: var(--transition-smooth);
}

.feature-card:hover {
  border-color: var(--card-border-hover);
  background: var(--card-bg-hover);
  box-shadow: var(--card-shadow-hover);
  transform: translateY(-3px);
}

.feature-icon-box {
  display: flex;
  width: 52px;
  height: 52px;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  border-radius: 12px;
  background: var(--primary-light);
  color: var(--primary-color);
}

.feature-title {
  margin-bottom: 0.75rem;
  color: var(--text-primary);
  font-size: 1.1875rem;
  font-weight: 700;
}

.feature-text {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.75;
}

/* Featured prototype */
.prototype-section {
  background: rgba(255, 255, 255, 0.18);
}

/* Specialist coach selection */
.coach-selection-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
}

.coach-selection-card {
  display: grid;
  grid-template-columns: 128px 1fr;
  align-items: center;
  gap: 1.25rem;
  min-height: 220px;
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  background: var(--card-bg);
  box-shadow: var(--card-shadow);
  color: var(--text-primary);
  padding: 1.25rem;
  text-decoration: none;
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

.coach-selection-card:hover {
  border-color: var(--card-border-hover);
  box-shadow: var(--card-shadow-hover);
  transform: translateY(-3px);
}

.coach-selection-card:focus-visible {
  outline: 3px solid rgba(67, 110, 89, 0.42);
  outline-offset: 3px;
}

.coach-selection-card img {
  width: 128px;
  height: 128px;
  border-radius: 50%;
  box-shadow: 0 0 0 6px rgba(232, 240, 231, 0.92), 0 8px 20px rgba(78, 64, 52, 0.12);
  object-fit: cover;
}

.coach-selection-content h3 {
  margin: 0.2rem 0 0.3rem;
  font-size: 1.35rem;
}

.coach-selection-content p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.65;
}

.coach-selection-label,
.coach-selection-technique {
  color: var(--primary-color) !important;
  font-size: 0.75rem !important;
  font-weight: 700;
}

.coach-selection-technique {
  margin-bottom: 0.35rem !important;
}

.coach-selection-cta {
  display: inline-block;
  margin-top: 0.85rem;
  color: var(--primary-color);
  font-size: 0.875rem;
  font-weight: 700;
}

.coach-selection-note {
  margin: 1.5rem auto 0;
  color: var(--text-small);
  font-size: 0.8125rem;
  line-height: 1.7;
  text-align: center;
}

.prototype-card {
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  background: var(--card-bg);
  box-shadow: var(--card-shadow);
  padding: 3rem;
}

.prototype-grid {
  display: grid;
  grid-template-columns: 240px 1fr;
  align-items: center;
  gap: 3rem;
}

.prototype-visual {
  display: flex;
  justify-content: center;
}

.avatar-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.counselor-preview-img {
  width: 140px;
  height: 140px;
  margin-bottom: 1rem;
  border: 4px solid rgba(67, 110, 89, 0.34);
  border-radius: 50%;
  box-shadow: 0 0 0 8px var(--primary-light), 0 10px 24px var(--primary-glow);
  object-fit: cover;
}

.coach-name {
  display: block;
  color: var(--text-primary);
  font-size: 1.125rem;
  font-weight: 700;
}

.coach-role {
  display: block;
  color: var(--primary-color);
  font-family: var(--font-latin);
  font-size: 0.8125rem;
  font-weight: 700;
}

.prototype-content {
  display: flex;
  flex-direction: column;
}

.prototype-badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.pill-badge {
  border: 1px solid rgba(67, 110, 89, 0.28);
  border-radius: var(--radius-full);
  background: var(--primary-light);
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.625rem;
}

.prototype-title {
  margin-bottom: 1rem;
  color: var(--text-primary);
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.prototype-desc {
  margin-bottom: 1.5rem;
  color: var(--text-secondary);
  font-size: 0.975rem;
  line-height: 1.8;
}

.prototype-points {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
  margin-bottom: 2rem;
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  background: var(--card-bg-subtle);
  padding: 1.25rem;
}

.point-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.point-icon {
  font-size: 1.2rem;
  line-height: 1.4;
}

.point-item strong {
  display: block;
  margin-bottom: 0.15rem;
  color: var(--text-primary);
  font-size: 0.9375rem;
}

.point-item p {
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.65;
}

.prototype-cta-box {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.cta-note {
  color: var(--text-small);
  font-size: 0.8125rem;
  text-align: center;
}

/* Disclaimer */
.disclaimer-section {
  padding-top: 4rem;
}

.disclaimer-card {
  border: 1px solid var(--card-border);
  border-left: 4px solid var(--accent-terracotta);
  border-radius: var(--radius-md);
  background: var(--card-bg);
  box-shadow: 0 10px 28px -4px rgba(78, 64, 52, 0.06);
  padding: 2.5rem;
}

.disclaimer-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  color: var(--accent-terracotta-strong);
}

.disclaimer-icon {
  flex-shrink: 0;
}

.disclaimer-title {
  color: var(--text-primary);
  font-size: 1.25rem;
  font-weight: 700;
}

.disclaimer-body {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.disclaimer-block h3 {
  margin-bottom: 0.5rem;
  color: var(--text-primary);
  font-size: 0.95rem;
  font-weight: 700;
}

.disclaimer-block p {
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.75;
}

.crisis-list {
  margin-top: 0.75rem;
  border: 1px solid rgba(154, 80, 62, 0.32);
  border-left: 3px solid var(--accent-terracotta-strong);
  border-radius: var(--radius-sm);
  background: var(--accent-gold-light);
  list-style: none;
  padding: 1rem 1.25rem;
}

.crisis-list li {
  margin-bottom: 0.25rem;
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.7;
}

.crisis-list li:last-child {
  margin-bottom: 0;
}

.crisis-list a {
  color: var(--primary-hover);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* Footer */
.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--card-border);
  background: var(--bg-gradient-bottom);
}

.footer-container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 2.5rem 1.5rem 2rem;
}

.footer-logo {
  color: var(--text-primary);
  font-family: var(--font-latin);
  font-size: 1.125rem;
  font-weight: 700;
}

.footer-tagline {
  margin-top: 0.25rem;
  color: var(--text-small);
  font-family: var(--font-latin);
  font-size: 0.8125rem;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-link {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-link:hover {
  color: var(--primary-color);
}

.footer-bottom {
  border-top: 1px solid rgba(190, 180, 167, 0.6);
  padding: 1.25rem 0;
  text-align: center;
}

.copyright {
  color: var(--text-small);
  font-family: var(--font-latin);
  font-size: 0.8125rem;
}

/* Responsive */
@media (max-width: 900px) {
  .prototype-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
    text-align: center;
  }

  .avatar-container {
    margin: 0 auto;
  }

  .prototype-badge-row {
    justify-content: center;
  }

  .prototype-points {
    text-align: left;
  }

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

@media (max-width: 768px) {
  .site-nav {
    display: none;
  }

  .hero-title {
    font-size: 2.125rem;
  }

  .hero-section {
    padding: 4.5rem 0 3.5rem;
  }

  .prototype-card {
    padding: 2rem 1.5rem;
  }

  .coach-selection-grid {
    grid-template-columns: 1fr;
  }

  .coach-selection-card {
    grid-template-columns: 104px 1fr;
    min-height: 0;
    padding: 1rem;
  }

  .coach-selection-card img {
    width: 104px;
    height: 104px;
  }

  .disclaimer-card {
    padding: 1.75rem 1.25rem;
  }
}

@media (max-width: 640px) {
  .mobile-only {
    display: inline;
  }
}

@media (max-width: 480px) {
  .header-container {
    gap: 0.75rem;
    padding: 0.875rem 1rem;
  }

  .brand-logo {
    font-size: 1.05rem;
  }

  .header-cta .btn-sm {
    padding: 0.5rem 0.75rem;
    font-size: 0.75rem;
  }

  .header-container {
    flex-wrap: wrap;
  }

  .site-nav {
    order: 4;
    width: 100%;
  }

  .site-nav .nav-list {
    justify-content: space-between;
    gap: 0.5rem;
  }

  .header-language {
    margin-left: auto;
  }

  .container {
    padding: 0 1rem;
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .hero-actions {
    width: 100%;
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
    white-space: normal;
  }

  .prototype-cta-box .btn {
    white-space: normal;
  }

  .footer-container {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* Respect the user's motion preference. */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .btn-primary:hover,
  .btn-outline:hover,
  .feature-card:hover {
    transform: none !important;
  }
}