/* ============================================================
   Mochi Lab. AI Developments — style.css
   配色: #0a1628 (主BG) / #0f1f3a (副BG) / #22d3ee (cyan) / #818cf8 (violet)
   ============================================================ */

/* ---------- CSS Variables ---------- */
:root {
  --color-bg:        #0a1628;
  --color-bg-sub:    #0f1f3a;
  --color-card:      rgba(255, 255, 255, 0.04);
  --color-border:    rgba(255, 255, 255, 0.08);
  --color-cyan:      #22d3ee;
  --color-violet:    #818cf8;
  --color-text:      #e5e7eb;
  --color-text-muted:#9ca3af;
  --color-white:     #ffffff;

  --font-ja: "Noto Sans JP", system-ui, -apple-system, "Hiragino Sans", "Yu Gothic UI", sans-serif;
  --font-en: "Inter", system-ui, sans-serif;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  --transition: 0.25s ease;
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);

  /* Hero background — CSS变数で差し替えやすくする */
  --hero-bg-image: none; /* 後で hero.jpg を差し替える場合: url('/assets/img/hero.jpg') */
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-ja);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-ja);
  font-weight: 700;
  line-height: 1.4;
}

a {
  color: var(--color-cyan);
  text-decoration: none;
  transition: opacity var(--transition);
}

a:hover, a:focus-visible {
  opacity: 0.8;
}

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

ul, ol {
  list-style: none;
}

/* ---------- Focus ---------- */
:focus-visible {
  outline: 2px solid var(--color-cyan);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* ---------- Container ---------- */
.container {
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: clamp(1rem, 5vw, 3rem);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-md);
  font-family: var(--font-ja);
  font-size: 0.9375rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
  border: none;
  white-space: nowrap;
}

.btn:hover, .btn:focus-visible {
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-cyan) 0%, var(--color-violet) 100%);
  color: var(--color-bg);
  box-shadow: 0 4px 16px rgba(34, 211, 238, 0.25);
}

.btn-primary:hover, .btn-primary:focus-visible {
  box-shadow: 0 6px 24px rgba(34, 211, 238, 0.4);
  opacity: 1;
}

.btn-outline {
  background: transparent;
  color: var(--color-text);
  border: 1.5px solid var(--color-border);
}

.btn-outline:hover, .btn-outline:focus-visible {
  border-color: var(--color-cyan);
  color: var(--color-cyan);
  opacity: 1;
}

/* ---------- Section base ---------- */
.section {
  padding-block: clamp(4rem, 8vw, 7rem);
}

.section-title {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  margin-bottom: 1rem;
  color: var(--color-white);
}

.section-sub {
  font-size: 1.0625rem;
  color: var(--color-text-muted);
  margin-bottom: 3rem;
}

.section-header {
  text-align: center;
  margin-bottom: 3.5rem;
}

/* ---------- Fade-in animation ---------- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in--delay1 { transition-delay: 0.1s; }
.fade-in--delay2 { transition-delay: 0.2s; }
.fade-in--delay3 { transition-delay: 0.3s; }

@media (prefers-reduced-motion: reduce) {
  .fade-in {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  position: fixed;
  top: 0;
  inset-inline: 0;
  z-index: 100;
  background: transparent;
  transition: background var(--transition), box-shadow var(--transition);
}

.site-header.scrolled {
  background: rgba(10, 22, 40, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  height: 64px;
}

.logo {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  gap: 1px;
  flex-shrink: 0;
  color: var(--color-white);
}

.logo-main {
  font-family: var(--font-en);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.logo-sub {
  font-family: var(--font-en);
  font-size: 0.6875rem;
  font-weight: 500;
  color: var(--color-cyan);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.nav-desktop {
  display: flex;
  gap: 1.75rem;
  align-items: center;
  margin-inline-start: auto;
}

.nav-desktop a {
  font-family: var(--font-en);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
  transition: color var(--transition);
}

.nav-desktop a:hover, .nav-desktop a:focus-visible {
  color: var(--color-cyan);
  opacity: 1;
}

.nav-cta {
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  margin-inline-start: auto;
  border-radius: var(--radius-sm);
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.hamburger[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.hamburger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile Nav */
.nav-mobile {
  background: rgba(10, 22, 40, 0.97);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--color-border);
  padding: 1.5rem var(--container-padding, 1.5rem);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.mobile-nav-link {
  font-family: var(--font-en);
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text-muted);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  display: block;
  transition: color var(--transition), background var(--transition);
}

.mobile-nav-link:hover, .mobile-nav-link:focus-visible {
  color: var(--color-cyan);
  background: rgba(34, 211, 238, 0.08);
  opacity: 1;
}

.mobile-cta {
  margin-top: 1rem;
  text-align: center;
}

@media (max-width: 768px) {
  .hamburger { display: flex; }
  .nav-desktop, .nav-cta { display: none; }
}

@media (min-width: 769px) {
  .nav-mobile { display: none !important; }
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-top: 64px;
  overflow: hidden;
  background-image: var(--hero-bg-image);
  background-size: cover;
  background-position: center;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background: radial-gradient(ellipse 80% 60% at 60% 40%, rgba(34, 211, 238, 0.06) 0%, transparent 60%),
              radial-gradient(ellipse 60% 50% at 20% 70%, rgba(129, 140, 248, 0.07) 0%, transparent 55%),
              linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-sub) 100%);
}

.hero-noise {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

/* グリッドパターン */
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 0%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 0%, transparent 80%);
}

.hero-content {
  position: relative;
  z-index: 1;
  padding-block: 5rem 4rem;
  max-width: 900px;
}

.hero-title {
  font-size: clamp(1.75rem, 4.5vw, 3.25rem);
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 1.5rem;
  color: var(--color-white);
  letter-spacing: -0.01em;
}

.hero-title br { content: ""; display: block; }

.hero-sub {
  font-size: clamp(0.9375rem, 1.5vw, 1.125rem);
  color: var(--color-text-muted);
  max-width: 640px;
  margin-bottom: 2.5rem;
  line-height: 1.9;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 4rem;
}

.hero-values {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

@media (max-width: 768px) {
  .hero-values {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
}

.hero-value-item {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.hero-value-icon {
  color: var(--color-cyan);
  margin-bottom: 0.75rem;
}

.hero-value-title {
  font-weight: 700;
  font-size: 0.9375rem;
  color: var(--color-white);
  margin-bottom: 0.25rem;
}

.hero-value-desc {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ============================================================
   PROBLEMS
   ============================================================ */
.section-problems {
  background: var(--color-bg-sub);
}

.problems-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

@media (max-width: 768px) {
  .problems-grid { grid-template-columns: 1fr; }
}

.problem-card {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.problem-card:hover {
  border-color: rgba(34, 211, 238, 0.25);
  box-shadow: 0 4px 20px rgba(34, 211, 238, 0.08);
}

.problem-icon {
  color: var(--color-violet);
  flex-shrink: 0;
  margin-top: 0.125rem;
}

.problem-card p {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--color-text);
}

/* ============================================================
   SERVICES
   ============================================================ */
.section-services {
  background: var(--color-bg);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

@media (max-width: 1024px) {
  .services-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
  .services-grid { grid-template-columns: 1fr; }
}

.service-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 1.75rem 1.5rem;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.service-card:hover {
  transform: translateY(-4px);
  border-color: rgba(34, 211, 238, 0.2);
  box-shadow: 0 8px 32px rgba(34, 211, 238, 0.1);
}

.service-icon {
  color: var(--color-cyan);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(34, 211, 238, 0.1);
  border-radius: var(--radius-md);
  flex-shrink: 0;
}

.service-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-white);
  line-height: 1.5;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.service-badge {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 99px;
  background: rgba(129, 140, 248, 0.15);
  color: var(--color-violet);
  border: 1px solid rgba(129, 140, 248, 0.25);
  white-space: nowrap;
}

.service-desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.8;
  flex: 1;
}

/* ============================================================
   PROCESS
   ============================================================ */
.section-process {
  background: var(--color-bg-sub);
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  position: relative;
}

@media (max-width: 768px) {
  .process-steps {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .step-arrow { display: none; }
}

.process-step {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 1.5rem;
  position: relative;
}

.step-number {
  font-family: var(--font-en);
  font-size: 2.5rem;
  font-weight: 700;
  color: rgba(34, 211, 238, 0.2);
  line-height: 1;
  margin-bottom: 0.75rem;
  letter-spacing: -0.03em;
}

.step-content {
  flex: 1;
}

.step-title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 0.5rem;
}

.step-desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.step-arrow {
  position: absolute;
  right: -12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-cyan);
  z-index: 1;
  opacity: 0.5;
}

/* 最後のステップには矢印不要 */
.process-step:last-child .step-arrow {
  display: none;
}

@media (max-width: 1024px) {
  .process-steps { grid-template-columns: repeat(2, 1fr); }
  .step-arrow { display: none; }
  .process-step:nth-child(2) .step-arrow,
  .process-step:nth-child(4) .step-arrow { display: none; }
}

/* ============================================================
   WHY US
   ============================================================ */
.section-why {
  background: var(--color-bg);
}

.comparison-table-wrap {
  overflow-x: auto;
  margin-bottom: 2.5rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 520px;
}

.comparison-table th,
.comparison-table td {
  padding: 1rem 1.25rem;
  text-align: left;
  font-size: 0.9375rem;
  border-bottom: 1px solid var(--color-border);
  vertical-align: middle;
}

.comparison-table thead th {
  background: rgba(255, 255, 255, 0.03);
  color: var(--color-text-muted);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.comparison-table tbody tr:last-child td,
.comparison-table tbody tr:last-child th {
  border-bottom: none;
}

.comparison-table tbody th {
  color: var(--color-text-muted);
  font-weight: 500;
  font-size: 0.875rem;
  white-space: nowrap;
  background: rgba(255, 255, 255, 0.02);
}

.comparison-table tbody td {
  color: var(--color-text-muted);
}

.comparison-table .highlight-col {
  background: rgba(34, 211, 238, 0.05);
  color: var(--color-text);
  border-left: 2px solid rgba(34, 211, 238, 0.3);
}

.comparison-table .highlight-col strong {
  color: var(--color-cyan);
}

.comparison-table thead .highlight-col {
  color: var(--color-cyan);
  font-weight: 700;
}

.comparison-table tbody tr:hover td,
.comparison-table tbody tr:hover th {
  background: rgba(255, 255, 255, 0.02);
}

.why-note {
  font-size: 1.0625rem;
  color: var(--color-text-muted);
  line-height: 1.9;
  max-width: 720px;
  padding: 1.5rem 2rem;
  border-left: 3px solid var(--color-cyan);
  background: rgba(34, 211, 238, 0.04);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

/* ============================================================
   CONTACT
   ============================================================ */
.section-contact {
  background: var(--color-bg-sub);
}

.contact-form-wrap {
  max-width: 640px;
  margin-inline: auto;
}

.form-group {
  margin-bottom: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.form-group label {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text);
}

.required {
  color: var(--color-cyan);
  margin-inline-start: 0.25rem;
}

.optional {
  font-size: 0.8125rem;
  font-weight: 400;
  color: var(--color-text-muted);
  margin-inline-start: 0.25rem;
}

.form-group input,
.form-group textarea,
.form-group select {
  background: rgba(255, 255, 255, 0.05);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-family: var(--font-ja);
  font-size: 0.9375rem;
  padding: 0.75rem 1rem;
  width: 100%;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  appearance: none;
  -webkit-appearance: none;
}

.form-group select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='none' stroke='%239ca3af' stroke-width='1.5' viewBox='0 0 24 24'%3E%3Cpath d='M19 9l-7 7-7-7'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.875rem center;
  padding-right: 2.5rem;
  cursor: pointer;
}

.form-group select option {
  background: var(--color-bg-sub);
  color: var(--color-text);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--color-cyan);
  box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.12);
}

.form-group input.error,
.form-group textarea.error,
.form-group select.error {
  border-color: #f87171;
}

.form-group textarea {
  resize: vertical;
  min-height: 140px;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-text-muted);
  opacity: 0.6;
}

.field-hint {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.field-error {
  font-size: 0.8125rem;
  color: #f87171;
  min-height: 1.2em;
}

.form-error-summary {
  background: rgba(248, 113, 113, 0.1);
  border: 1px solid rgba(248, 113, 113, 0.3);
  border-radius: var(--radius-md);
  padding: 0.875rem 1rem;
  font-size: 0.875rem;
  color: #f87171;
  margin-bottom: 1.5rem;
}

/* Honeypot — 視覚的に完全非表示 */
.honeypot-field {
  position: absolute;
  left: -9999px;
  top: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
  opacity: 0;
  pointer-events: none;
  tab-index: -1;
}

.privacy-note {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
  text-align: center;
}

.btn-submit {
  width: 100%;
  justify-content: center;
  padding-block: 0.9375rem;
  font-size: 1rem;
  position: relative;
}

.btn-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* Loading spinner */
@keyframes spin {
  to { transform: rotate(360deg); }
}

.spin {
  animation: spin 0.8s linear infinite;
}

@media (prefers-reduced-motion: reduce) {
  .spin { animation: none; }
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background: rgba(0, 0, 0, 0.3);
  border-top: 1px solid var(--color-border);
  padding-block: 2.5rem;
}

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

.footer-logo {
  font-family: var(--font-en);
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-text-muted);
  margin-bottom: 0.25rem;
}

.footer-copy {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  opacity: 0.7;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
}

.footer-nav a {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.footer-nav a:hover, .footer-nav a:focus-visible {
  color: var(--color-cyan);
  opacity: 1;
}

@media (max-width: 600px) {
  .footer-inner { flex-direction: column; align-items: flex-start; }
}

/* ============================================================
   CASES (典型的な活用シーン)
   ============================================================ */
.section-cases {
  background: var(--color-bg-sub);
}

.cases-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

@media (max-width: 768px) {
  .cases-grid { grid-template-columns: 1fr; }
}

.case-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 1.75rem 1.5rem;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), border-color var(--transition);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.case-card:hover {
  transform: translateY(-3px);
  border-color: rgba(34, 211, 238, 0.2);
}

.case-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.7rem;
  border-radius: 99px;
  background: rgba(34, 211, 238, 0.1);
  color: var(--color-cyan);
  border: 1px solid rgba(34, 211, 238, 0.25);
  width: fit-content;
  letter-spacing: 0.02em;
}

.case-title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-white);
  line-height: 1.55;
}

.case-desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.8;
  flex: 1;
}

.case-tech {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  padding-top: 0.75rem;
  border-top: 1px dashed var(--color-border);
}

.case-tech strong {
  color: var(--color-text);
  font-weight: 600;
}

.cases-note {
  margin-top: 2rem;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  text-align: center;
}

/* ============================================================
   TECH STACK (対応技術)
   ============================================================ */
.section-tech {
  background: var(--color-bg);
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

@media (max-width: 1024px) {
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
  .tech-grid { grid-template-columns: 1fr; }
}

.tech-block {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.25rem 1.5rem;
}

.tech-block-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-cyan);
  margin-bottom: 0.85rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
  letter-spacing: 0.02em;
}

.tech-tags {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tech-tags li {
  font-size: 0.75rem;
  padding: 0.25rem 0.65rem;
  border-radius: 99px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  white-space: nowrap;
}

/* ============================================================
   FAQ
   ============================================================ */
.section-faq {
  background: var(--color-bg-sub);
}

.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.faq-item {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1rem 1.25rem;
  transition: border-color var(--transition);
}

.faq-item[open] {
  border-color: rgba(34, 211, 238, 0.3);
}

.faq-q {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-white);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding-right: 0.25rem;
}

.faq-q::-webkit-details-marker { display: none; }

.faq-q::after {
  content: '+';
  font-size: 1.5rem;
  font-weight: 300;
  color: var(--color-cyan);
  transition: transform var(--transition);
  line-height: 1;
}

.faq-item[open] .faq-q::after {
  content: '−';
}

.faq-a {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--color-border);
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.8;
}

/* ============================================================
   UTILITIES
   ============================================================ */

/* Accent text */
.text-cyan { color: var(--color-cyan); }
.text-violet { color: var(--color-violet); }