/* ================================================
   DESIGN TOKENS
================================================ */
:root {
  --bg:       #F1EFE8;
  --text:     #2C2C2A;
  --muted:    #5F5E5A;
  --border:   #D8D5CC;
  --white:    #FFFFFF;

  --font-en:  'Montserrat', sans-serif;
  --font-ja:  'Noto Sans JP', sans-serif;

  --radius-sm: 4px;
  --radius-md: 8px;

  --space-sm:  24px;
  --space-md:  48px;
  --space-lg:  80px;
  --space-xl: 112px;

  --max-w: 1200px;
}

/* ================================================
   RESET
================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-ja);
  font-weight: 300;
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

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

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

/* ================================================
   CONTAINER
================================================ */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: 24px;
}

@media (min-width: 768px) {
  .container { padding-inline: 40px; }
}

@media (min-width: 1024px) {
  .container { padding-inline: 60px; }
}

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

/* 英字の小見出しラベル */
.label-en,
.section-label {
  display: block;
  font-family: var(--font-en);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 16px;
}

.section-title {
  font-family: var(--font-ja);
  font-size: 22px;
  font-weight: 300;
  letter-spacing: 0.03em;
  line-height: 1.45;
  margin-bottom: 28px;
}

@media (min-width: 768px) {
  .section-title { font-size: 26px; }
}

/* ================================================
   BUTTONS
================================================ */
.btn-primary {
  display: inline-block;
  background-color: var(--text);
  color: var(--bg);
  font-family: var(--font-ja);
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0.06em;
  padding: 14px 32px;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: opacity 0.2s ease;
}

.btn-primary:hover {
  opacity: 0.72;
}

.btn-large {
  font-size: 15px;
  padding: 18px 48px;
}

/* nav用テキストリンク */
.btn-nav {
  font-family: var(--font-en);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--text);
  padding-bottom: 2px;
  transition: opacity 0.2s;
}

.btn-nav:hover {
  opacity: 0.6;
}

/* ================================================
   PLACEHOLDER IMAGES
================================================ */
.placeholder-img {
  width: 100%;
  background-color: var(--border);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.placeholder-img span {
  font-family: var(--font-en);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  text-align: center;
  line-height: 1.7;
}

.ratio-4-5 { aspect-ratio: 4 / 5; }
.ratio-3-4 { aspect-ratio: 3 / 4; }

/* ================================================
   HEADER
================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg);
  border-bottom: 1px solid var(--border);
  padding-block: 16px;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--font-en);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.nav {
  display: none;
  align-items: center;
  gap: 32px;
}

.nav a {
  font-size: 13px;
  font-weight: 300;
  color: var(--muted);
  transition: color 0.2s;
}

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

@media (min-width: 768px) {
  .nav { display: flex; }
}

/* ================================================
   SECTION 1: HERO
================================================ */
.hero {
  padding-block: var(--space-lg);
}

.hero-inner {
  display: grid;
  gap: 40px;
}

@media (min-width: 768px) {
  .hero-inner {
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 56px;
  }
}

@media (min-width: 1024px) {
  .hero-inner {
    grid-template-columns: 54% 1fr;
    gap: 72px;
  }
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hero-content .label-en {
  margin-bottom: 20px;
}

.hero-title {
  font-family: var(--font-ja);
  font-size: 34px;
  font-weight: 300;
  letter-spacing: 0.04em;
  line-height: 1.38;
  margin-bottom: 20px;
}

@media (min-width: 768px) {
  .hero-title { font-size: 42px; }
}

.hero-desc {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.9;
  margin-bottom: 32px;
}

.hero-note {
  margin-top: 14px;
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ================================================
   SECTION 2: FEATURES
================================================ */
.features {
  padding-block: var(--space-xl);
  border-top: 1px solid var(--border);
}

.features-grid {
  display: grid;
  gap: 40px;
  margin-top: 8px;
}

@media (min-width: 768px) {
  .features-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 48px;
  }
}

.feature-num {
  font-family: var(--font-en);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--muted);
  margin-bottom: 16px;
}

.feature-title {
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.03em;
  margin-bottom: 10px;
  line-height: 1.5;
}

.feature-desc {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.9;
}

/* ================================================
   SECTION 3: MATERIAL & SIZE
================================================ */
.material {
  padding-block: var(--space-xl);
  border-top: 1px solid var(--border);
}

.material-inner {
  display: grid;
  gap: 56px;
}

@media (min-width: 1024px) {
  .material-inner {
    grid-template-columns: 1fr 1fr;
    gap: 80px;
  }
}

.material-desc {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.9;
  margin-bottom: 28px;
}

.material-spec {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.material-spec li {
  display: flex;
  align-items: baseline;
  gap: 20px;
  font-size: 13px;
  padding-block: 13px;
  border-bottom: 1px solid var(--border);
}

.material-spec li:first-child {
  border-top: 1px solid var(--border);
}

.material-spec li span {
  font-family: var(--font-en);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  min-width: 60px;
  flex-shrink: 0;
}

/* --- Size Table --- */
.size-section .section-title {
  margin-top: 0;
}

table {
  width: 100%;
  border-collapse: collapse;
}

thead th {
  font-family: var(--font-en);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  text-align: center;
  padding: 10px 8px 12px;
  border-bottom: 1px solid var(--text);
}

thead th:first-child {
  text-align: left;
}

tbody td {
  font-size: 13px;
  text-align: center;
  padding: 14px 8px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}

tbody td:first-child {
  font-family: var(--font-en);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-align: left;
}

.size-note {
  margin-top: 14px;
  font-size: 12px;
  color: var(--muted);
}

/* ================================================
   SECTION 4: COORDINATE / STYLING
================================================ */
.coordinate {
  padding-block: var(--space-xl);
  border-top: 1px solid var(--border);
}

.coord-grid {
  display: grid;
  gap: 16px;
  margin-top: 8px;
}

@media (min-width: 768px) {
  .coord-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }
}

.coord-caption {
  font-family: var(--font-en);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  text-align: center;
  margin-top: 12px;
}

/* ================================================
   SECTION 5: REVIEWS
================================================ */
.reviews {
  padding-block: var(--space-xl);
  border-top: 1px solid var(--border);
}

.reviews-grid {
  display: grid;
  gap: 20px;
  margin-top: 8px;
}

@media (min-width: 768px) {
  .reviews-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.review-card {
  background-color: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.review-stars {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--text);
}

.review-text {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.85;
  flex: 1;
}

.review-name {
  font-size: 13px;
  font-weight: 500;
}

.review-meta {
  font-size: 11px;
  color: var(--muted);
  margin-top: 3px;
  font-family: var(--font-en);
  letter-spacing: 0.05em;
}

/* ================================================
   SECTION 6: FAQ
================================================ */
.faq {
  padding-block: var(--space-xl);
  border-top: 1px solid var(--border);
}

.faq-list {
  margin-top: 8px;
}

.faq-item {
  border-bottom: 1px solid var(--border);
}

.faq-item:first-of-type {
  border-top: 1px solid var(--border);
}

.faq-q {
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding-block: 20px;
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0.01em;
  line-height: 1.6;
  cursor: pointer;
  user-select: none;
}

/* Chromeのデフォルト矢印を消す */
.faq-q::-webkit-details-marker { display: none; }

/* +/− アイコン */
.faq-q::after {
  content: '+';
  font-family: var(--font-en);
  font-size: 20px;
  font-weight: 300;
  color: var(--muted);
  flex-shrink: 0;
  line-height: 1;
  transition: transform 0.2s ease;
}

details[open] > .faq-q::after {
  content: '\2212'; /* − */
}

.faq-a {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.9;
  padding-bottom: 20px;
  max-width: 720px;
}

/* ================================================
   SECTION 7: FINAL CTA
================================================ */
.final-cta {
  padding-block: var(--space-xl);
  border-top: 1px solid var(--border);
  text-align: center;
}

.final-cta .label-en {
  justify-content: center;
  display: block;
}

.cta-title {
  font-size: 26px;
  font-weight: 300;
  letter-spacing: 0.04em;
  line-height: 1.55;
  margin-bottom: 36px;
}

@media (min-width: 768px) {
  .cta-title { font-size: 34px; }
}

.trust-info {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  margin-top: 28px;
}

@media (min-width: 768px) {
  .trust-info {
    flex-direction: row;
    justify-content: center;
    gap: 40px;
  }
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.trust-check {
  font-size: 13px;
  color: var(--muted);
}

.trust-item p {
  font-size: 13px;
  color: var(--muted);
}

/* ================================================
   FOOTER
================================================ */
.site-footer {
  padding-block: 48px;
  border-top: 1px solid var(--border);
}

.site-footer .container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  text-align: center;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px 28px;
}

.footer-nav a {
  font-size: 12px;
  color: var(--muted);
  transition: color 0.2s;
}

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

.copyright {
  font-family: var(--font-en);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--muted);
}