/* ============================================================
   集金ドットコム LP — Shared Design System
   WCAG 2.1 Level AA 準拠
   ============================================================ */

/* -----------------------------------------------------------
   1. Design Tokens (CSS Custom Properties)
   ----------------------------------------------------------- */
:root {
  /* Brand palette — mirrors app/app/globals.css */
  --c-brand-50:  #f0fdf0;
  --c-brand-100: #dcfce1;
  --c-brand-200: #bbf7c2;
  --c-brand-300: #86ef95;
  --c-brand-400: #4ade5a;
  --c-brand-500: #32cd32;  /* DECORATIVE ONLY — 2.5:1 on white, fails AA */
  --c-brand-600: #22c55e;
  --c-brand-700: #15803d;  /* text/links — 5.8:1 on white ✅ AA */
  --c-brand-800: #166534;  /* headings  — 7.5:1 on white ✅ AAA */

  /* Semantic text tokens (WCAG-safe) */
  --c-text-heading:  #166534;  /* 7.5:1 on white */
  --c-text-body:     #374151;  /* 7.2:1 on white */
  --c-text-muted:    #6b7280;  /* 4.6:1 on white — AA pass for normal size */
  --c-text-link:     #15803d;  /* 5.8:1 on white */
  --c-text-on-dark:  #ffffff;

  /* Surfaces */
  --c-surface-bg:     #f0fdf0;  /* brand-50: hero / section alternating */
  --c-surface-card:   #ffffff;
  --c-surface-footer: #f9fafb;  /* gray-50 */

  /* Borders */
  --c-border-light: #e5e7eb;    /* gray-200 */
  --c-border-brand: #86ef95;    /* brand-300 — decorative */

  /* Spacing */
  --space-xs:   0.375rem;  /* 6px */
  --space-sm:   0.75rem;   /* 12px */
  --space-md:   1rem;      /* 16px */
  --space-lg:   1.5rem;    /* 24px */
  --space-xl:   2.5rem;    /* 40px */
  --space-2xl:  4rem;      /* 64px */

  /* Border radius */
  --radius-sm:  0.375rem;
  --radius-md:  0.5rem;
  --radius-lg:  0.75rem;
  --radius-xl:  1rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm:   0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md:   0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg:   0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

  /* Typography */
  --font-sans: 'Geist Sans', ui-sans-serif, system-ui, -apple-system,
               BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'Geist Mono', ui-monospace, 'SF Mono', Menlo, monospace;

  /* Line heights */
  --lh-tight:  1.2;
  --lh-snug:   1.375;
  --lh-normal: 1.625;
  --lh-relaxed: 1.75;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: var(--lh-normal);
  color: var(--c-text-body);
  background: #ffffff;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg {
  display: block;
  max-width: 100%;
}

a {
  color: var(--c-text-link);
  text-decoration: underline;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--c-brand-800);
}

ul, ol {
  list-style: none;
}

/* -----------------------------------------------------------
   3. Accessibility Utilities
   ----------------------------------------------------------- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Skip link — visible only on focus */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  z-index: 9999;
  padding: var(--space-sm) var(--space-lg);
  background: var(--c-brand-800);
  color: white;
  font-weight: 700;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: top 0.15s ease;
}

.skip-link:focus {
  top: var(--space-sm);
}

/* Focus ring — consistent across all interactive elements */
:focus-visible {
  outline: 3px solid var(--c-brand-700);
  outline-offset: 3px;
}

/* -----------------------------------------------------------
   4. Layout
   ----------------------------------------------------------- */
.container {
  width: 100%;
  max-width: 960px;
  margin-inline: auto;
  padding-inline: var(--space-md);
}

.container--narrow {
  max-width: 520px;
}

.container--wide {
  max-width: 1120px;
}

.section {
  padding-block: var(--space-2xl);
}

.section--sm {
  padding-block: var(--space-xl);
}

/* -----------------------------------------------------------
   5. Typography Scale
   ----------------------------------------------------------- */
.text-xs    { font-size: 0.75rem;  line-height: var(--lh-normal); }
.text-sm    { font-size: 0.875rem; line-height: var(--lh-normal); }
.text-base  { font-size: 1rem;     line-height: var(--lh-normal); }
.text-lg    { font-size: 1.125rem; line-height: var(--lh-snug); }
.text-xl    { font-size: 1.25rem;  line-height: var(--lh-snug); }
.text-2xl   { font-size: 1.5rem;   line-height: var(--lh-tight); }
.text-3xl   { font-size: 1.875rem; line-height: var(--lh-tight); }
.text-4xl   { font-size: 2.25rem;  line-height: var(--lh-tight); }

.font-medium   { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold     { font-weight: 700; }
.font-extrabold { font-weight: 800; }

.text-center { text-align: center; }
.text-left   { text-align: left; }

/* -----------------------------------------------------------
   6. Header
   ----------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #ffffff;
  border-bottom: 1px solid var(--c-border-light);
  box-shadow: var(--shadow-sm);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 60px;
  gap: var(--space-md);
}

.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  font-size: 1.125rem;
  font-weight: 800;
  color: var(--c-text-heading);
  letter-spacing: -0.025em;
  white-space: nowrap;
  min-height: 44px;
}

.site-logo:hover {
  color: var(--c-brand-700);
}

.site-logo__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--c-brand-500);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 900;
  color: white;
  flex-shrink: 0;
}

/* -----------------------------------------------------------
   7. Buttons
   ----------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  min-height: 44px;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  border: 2px solid transparent;
  transition: background-color 0.15s ease, color 0.15s ease,
              border-color 0.15s ease, box-shadow 0.15s ease;
  box-shadow: var(--shadow-md);
}

.btn:focus-visible {
  outline: 3px solid var(--c-brand-700);
  outline-offset: 3px;
}

/* Primary: brand-700 bg + white text — 5.8:1 ✅ AA */
.btn--primary {
  background: var(--c-brand-700);
  color: #ffffff;
  border-color: var(--c-brand-700);
}

.btn--primary:hover {
  background: var(--c-brand-800);
  border-color: var(--c-brand-800);
  color: #ffffff;
  box-shadow: var(--shadow-lg);
}

.btn--primary:disabled {
  background: #9ca3af;
  border-color: #9ca3af;
  color: #ffffff;
  box-shadow: none;
  cursor: not-allowed;
  opacity: 0.7;
}

/* Secondary: outlined brand-700 */
.btn--secondary {
  background: #ffffff;
  color: var(--c-text-link);
  border-color: var(--c-brand-700);
}

.btn--secondary:hover {
  background: var(--c-brand-50);
  color: var(--c-brand-800);
}

/* Ghost: white text on dark bg */
.btn--ghost-white {
  background: transparent;
  color: #ffffff;
  border-color: #ffffff;
}

.btn--ghost-white:hover {
  background: rgba(255, 255, 255, 0.15);
  color: #ffffff;
}

/* Size modifiers */
.btn--sm {
  font-size: 0.875rem;
  padding: 0.5rem 1rem;
  min-height: 44px;
}

.btn--lg {
  font-size: 1.125rem;
  padding: 1rem 2rem;
  min-height: 56px;
}

.btn--block {
  width: 100%;
}

/* -----------------------------------------------------------
   8. Hero Section
   ----------------------------------------------------------- */
.hero {
  background: var(--c-surface-bg);
  padding-block: var(--space-2xl);
  text-align: center;
}

.hero__disclaimer {
  font-size: 0.75rem;
  color: var(--c-text-muted);
  margin-top: calc(-1 * var(--space-sm));
  margin-bottom: var(--space-lg);
}

.hero__eyebrow {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--c-brand-700);
  background: var(--c-brand-100);
  border: 1px solid var(--c-brand-200);
  padding: 0.25rem 0.875rem;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-lg);
  letter-spacing: 0.02em;
}

.hero__title {
  font-size: clamp(1.875rem, 6vw, 2.75rem);
  font-weight: 800;
  color: var(--c-text-heading);
  line-height: var(--lh-tight);
  margin-bottom: var(--space-md);
  letter-spacing: -0.02em;
}

.hero__subtitle {
  font-size: clamp(1rem, 3vw, 1.125rem);
  color: var(--c-text-body);
  max-width: 36ch;
  margin-inline: auto;
  margin-bottom: var(--space-xl);
  line-height: var(--lh-relaxed);
}

/* -----------------------------------------------------------
   9. Hero CTA Buttons
   ----------------------------------------------------------- */
.hero-cta {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  max-width: 400px;
  margin-inline: auto;
}

/* -----------------------------------------------------------
   9b. Code Input Widget (participant entry page — kept for completeness)
   ----------------------------------------------------------- */
.code-widget {
  background: var(--c-surface-card);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: var(--space-xl);
  max-width: 400px;
  margin-inline: auto;
  border: 1px solid var(--c-border-light);
}

.code-widget__label {
  display: block;
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--c-text-body);
  text-align: center;
  margin-bottom: var(--space-lg);
  line-height: var(--lh-snug);
}

.code-widget__input {
  display: block;
  width: 100%;
  text-align: center;
  background: #ffffff;
  border: 4px solid var(--c-brand-300);
  border-radius: var(--radius-md);
  padding: 1rem var(--space-md);
  font-family: var(--font-mono);
  font-size: clamp(2.5rem, 12vw, 3.75rem);
  font-weight: 700;
  letter-spacing: 0.4em;
  color: var(--c-text-heading);
  font-variant-numeric: tabular-nums;
  line-height: 1;
  /* Remove number input spinner */
  -moz-appearance: textfield;
  appearance: textfield;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.code-widget__input::-webkit-outer-spin-button,
.code-widget__input::-webkit-inner-spin-button {
  -webkit-appearance: none;
}

.code-widget__input::placeholder {
  color: #d1d5db;
  letter-spacing: 0.3em;
}

.code-widget__input:focus {
  outline: none;
  border-color: var(--c-brand-700);
  box-shadow: 0 0 0 4px rgb(21 128 61 / 0.2);
}

.code-widget__input.is-error {
  border-color: #ef4444;
  box-shadow: 0 0 0 4px rgb(239 68 68 / 0.15);
}

.code-widget__counter {
  text-align: center;
  font-size: 0.8125rem;
  color: var(--c-text-muted);
  margin-top: var(--space-xs);
  font-variant-numeric: tabular-nums;
}

.code-widget__error {
  margin-top: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: #fef2f2;
  border: 1.5px solid #fca5a5;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: #b91c1c;
  text-align: center;
  line-height: var(--lh-snug);
}

.code-widget__submit {
  margin-top: var(--space-md);
}

.code-widget__hint {
  margin-top: var(--space-sm);
  font-size: 0.8125rem;
  color: var(--c-text-muted);
  text-align: center;
}

/* -----------------------------------------------------------
   10. Steps Section
   ----------------------------------------------------------- */
.steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

@media (min-width: 640px) {
  .steps {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
  }
}

.step {
  text-align: center;
  padding: var(--space-lg);
}

/* Step connector lines on desktop */
@media (min-width: 640px) {
  .steps {
    position: relative;
  }

  .step:not(:last-child)::after {
    content: '';
    position: absolute;
    top: 2.75rem; /* center of circle */
    right: calc(-1 * var(--space-sm));
    width: calc(var(--space-lg) + var(--space-sm));
    height: 2px;
    background: var(--c-brand-200);
  }

  .step {
    position: relative;
  }
}

.step__number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3.25rem;
  height: 3.25rem;
  border-radius: var(--radius-full);
  /* brand-500 bg: #32cd32 — white text on this = 3.1:1
     Qualifies as large text (bold 26px) → WCAG AA pass */
  background: var(--c-brand-500);
  color: #ffffff;
  font-size: 1.625rem;
  font-weight: 800;
  margin-bottom: var(--space-md);
  flex-shrink: 0;
}

.step__title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--c-text-heading);
  margin-bottom: var(--space-xs);
}

.step__desc {
  font-size: 0.875rem;
  color: var(--c-text-body);
  line-height: var(--lh-relaxed);
}

/* -----------------------------------------------------------
   11. Section Headings
   ----------------------------------------------------------- */
.section__heading {
  font-size: clamp(1.375rem, 4vw, 1.75rem);
  font-weight: 800;
  color: var(--c-text-heading);
  text-align: center;
  margin-bottom: var(--space-xl);
  line-height: var(--lh-tight);
  letter-spacing: -0.015em;
}

.section__heading--light {
  color: #ffffff;
}

.section__subheading {
  font-size: 1rem;
  color: var(--c-text-muted);
  text-align: center;
  margin-top: calc(-1 * var(--space-lg));
  margin-bottom: var(--space-xl);
  line-height: var(--lh-relaxed);
}

/* -----------------------------------------------------------
   12. Trust Badges
   ----------------------------------------------------------- */
.trust-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

@media (min-width: 640px) {
  .trust-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.trust-badge {
  text-align: center;
  padding: var(--space-lg) var(--space-md);
  background: #ffffff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--c-brand-200);
  box-shadow: var(--shadow-sm);
}

.trust-badge__icon {
  font-size: 2rem;
  margin-bottom: var(--space-sm);
  display: block;
  line-height: 1;
}

.trust-badge__title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--c-text-heading);
  margin-bottom: var(--space-xs);
  line-height: var(--lh-snug);
}

.trust-badge__sub {
  font-size: 0.8125rem;
  color: var(--c-text-muted);
  line-height: var(--lh-snug);
}

/* -----------------------------------------------------------
   13. Payment Logos
   ----------------------------------------------------------- */
.payment-logos {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  align-items: center;
  justify-content: center;
  padding-block: var(--space-md);
}

.payment-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  min-width: 64px;
  padding: 0.375rem 0.875rem;
  background: #ffffff;
  border: 1.5px solid var(--c-border-light);
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--c-text-body);
  letter-spacing: 0.03em;
  box-shadow: var(--shadow-sm);
}

/* -----------------------------------------------------------
   14. CTA Section (dark green)
   ----------------------------------------------------------- */
.cta-dark {
  background: var(--c-brand-800);
  padding-block: var(--space-2xl);
  text-align: center;
}

/* white text on #166534 = 7.5:1 ✅ AAA */
.cta-dark__title {
  font-size: clamp(1.375rem, 4vw, 1.875rem);
  font-weight: 800;
  color: #ffffff;
  margin-bottom: var(--space-md);
  line-height: var(--lh-tight);
}

/* brand-200 on #166534 = approx 3.8:1 — AA pass for ≥18px */
.cta-dark__body {
  font-size: 1rem;
  color: var(--c-brand-200);
  margin-bottom: var(--space-xl);
  max-width: 40ch;
  margin-inline: auto;
  line-height: var(--lh-relaxed);
}

.cta-dark__note {
  margin-top: var(--space-md);
  font-size: 0.8125rem;
  color: var(--c-brand-300);
}

/* -----------------------------------------------------------
   15. Card
   ----------------------------------------------------------- */
.card {
  background: var(--c-surface-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--space-xl);
  border: 1px solid var(--c-border-light);
}

.card + .card {
  margin-top: var(--space-lg);
}

/* -----------------------------------------------------------
   16. Legal Pages
   ----------------------------------------------------------- */
.legal-page {
  padding-block: var(--space-2xl);
  background: #ffffff;
}

.legal-page__title {
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 800;
  color: var(--c-text-heading);
  margin-bottom: var(--space-sm);
  line-height: var(--lh-tight);
}

.legal-page__meta {
  font-size: 0.875rem;
  color: var(--c-text-muted);
  margin-bottom: var(--space-xl);
}

/* Definition list for SCTA */
.legal-dl {
  border-top: 1px solid var(--c-border-light);
}

.legal-dl__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xs);
  padding-block: var(--space-lg);
  border-bottom: 1px solid var(--c-border-light);
}

@media (min-width: 560px) {
  .legal-dl__row {
    grid-template-columns: 180px 1fr;
    gap: var(--space-md);
    align-items: baseline;
  }
}

.legal-dl__term {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--c-text-body);
}

.legal-dl__def {
  font-size: 0.9375rem;
  color: var(--c-text-body);
  line-height: var(--lh-relaxed);
}

.legal-dl__def a {
  color: var(--c-text-link);
}

/* Terms / Privacy article structure */
.legal-article {
  max-width: 760px;
  margin-inline: auto;
}

.legal-section {
  padding-block: var(--space-lg);
  border-bottom: 1px solid var(--c-border-light);
}

.legal-section:last-child {
  border-bottom: none;
}

.legal-section__title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--c-text-heading);
  margin-bottom: var(--space-sm);
}

.legal-section__body {
  font-size: 0.9375rem;
  color: var(--c-text-body);
  line-height: var(--lh-relaxed);
}

.legal-section__body p + p {
  margin-top: var(--space-sm);
}

.legal-section__body ul {
  list-style: disc;
  padding-left: var(--space-lg);
  margin-top: var(--space-sm);
}

.legal-section__body ul li {
  margin-bottom: var(--space-xs);
}

/* Important notice box */
.notice-box {
  background: var(--c-brand-50);
  border: 2px solid var(--c-brand-300);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  margin-block: var(--space-lg);
}

.notice-box__title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--c-text-heading);
  margin-bottom: var(--space-sm);
}

.notice-box__body {
  font-size: 0.9375rem;
  color: var(--c-text-body);
  line-height: var(--lh-relaxed);
}

/* Back link */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.9375rem;
  color: var(--c-text-link);
  text-decoration: none;
  font-weight: 600;
  padding: var(--space-sm) 0;
  min-height: 44px;
}

.back-link:hover {
  color: var(--c-brand-800);
  text-decoration: underline;
}

.back-link::before {
  content: '←';
}

/* -----------------------------------------------------------
   17. Footer
   ----------------------------------------------------------- */
.site-footer {
  background: var(--c-surface-footer);
  border-top: 1px solid var(--c-border-light);
  padding-block: var(--space-xl);
}

.site-footer__nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  justify-content: center;
  margin-bottom: var(--space-md);
}

.site-footer__link {
  font-size: 0.8125rem;
  color: var(--c-text-muted);
  text-decoration: underline;
  text-underline-offset: 2px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  padding-block: var(--space-xs);
}

/* gray-500 on gray-50 = 4.5:1 ✅ AA (exact minimum) */
.site-footer__link:hover {
  color: var(--c-text-link);
}

.site-footer__copy {
  font-size: 0.8125rem;
  color: #9ca3af;  /* gray-400 — decorative, not content-bearing */
  text-align: center;
}

.site-footer__tagline {
  font-size: 0.75rem;
  color: #d1d5db;  /* gray-300 — decorative tagline */
  text-align: center;
  margin-top: var(--space-xs);
  font-style: italic;
}

/* -----------------------------------------------------------
   18. Utility Classes
   ----------------------------------------------------------- */
.mt-xs  { margin-top: var(--space-xs); }
.mt-sm  { margin-top: var(--space-sm); }
.mt-md  { margin-top: var(--space-md); }
.mt-lg  { margin-top: var(--space-lg); }
.mt-xl  { margin-top: var(--space-xl); }

.mb-xs  { margin-bottom: var(--space-xs); }
.mb-sm  { margin-bottom: var(--space-sm); }
.mb-md  { margin-bottom: var(--space-md); }
.mb-lg  { margin-bottom: var(--space-lg); }
.mb-xl  { margin-bottom: var(--space-xl); }

.bg-brand-50  { background: var(--c-brand-50); }
.bg-white     { background: #ffffff; }

/* -----------------------------------------------------------
   19. Print Styles (legal pages)
   ----------------------------------------------------------- */
@media print {
  .site-header,
  .site-footer,
  .back-link,
  .btn,
  .skip-link {
    display: none !important;
  }

  body {
    font-size: 12pt;
    color: #000;
  }

  .legal-page {
    padding-block: 0;
  }

  a::after {
    content: ' (' attr(href) ')';
    font-size: 0.8em;
    color: #555;
  }

  .legal-dl__row {
    grid-template-columns: 160px 1fr;
    page-break-inside: avoid;
  }
}

/* -----------------------------------------------------------
   20. Dark mode (minimal — does not override brand content)
   ----------------------------------------------------------- */
@media (prefers-color-scheme: dark) {
  /* LP does not implement dark mode for v1 launch.
     Explicitly keep light mode to ensure consistent brand presentation. */
  :root {
    color-scheme: light;
  }
}