/* Base & Reset */
:root {
  --color-bg: #0D0F12;
  --color-bg-light: #1A1D24;
  --color-text: #F3F4F6;
  --color-text-muted: #9CA3AF;
  --color-gold: #CDB27D;
  --color-gold-hover: #DBC495;
  --color-glass-bg: rgba(255, 255, 255, 0.03);
  --color-glass-border: rgba(205, 178, 125, 0.2);
  --color-border: #2A2F3A;
  
  --font-en: 'Inter', sans-serif;
  --font-jp: 'Noto Sans JP', sans-serif;
  
  --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  --layout-max-width: 1200px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 18px; /* ベースフォントサイズを引き上げ（全体が数%〜10%ほど大きく表示されます） */
}

body {
  font-family: var(--font-jp);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-jp);
  font-weight: 700;
  line-height: 1.3;
}

.text-gold {
  color: var(--color-gold);
}

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

.container {
  max-width: var(--layout-max-width);
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 76px 0;
}

/* Utilities */
.glass-card {
  background: var(--color-glass-bg);
  border: 1px solid var(--color-glass-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: 16px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: 4px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  font-family: var(--font-jp);
}

.btn-primary {
  background: linear-gradient(135deg, #CDB27D 0%, #B0915B 100%);
  color: #000;
  box-shadow: 0 4px 14px rgba(205, 178, 125, 0.3);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #DBC495 0%, #CDB27D 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(205, 178, 125, 0.4);
}

.btn-large {
  padding: 20px 48px;
  font-size: 1.125rem;
  border-radius: 8px;
}

.section-tag {
  display: inline-block;
  font-family: var(--font-en);
  font-size: 0.875rem;
  letter-spacing: 0.1em;
  color: var(--color-gold);
  margin-bottom: 12px;
  font-weight: 600;
}

.section-title {
  font-size: 2.25rem;
  margin-bottom: 1rem;
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: 24px 0;
  z-index: 1000;
  transition: var(--transition);
}

.navbar.scrolled {
  background: rgba(13, 15, 18, 0.9);
  backdrop-filter: blur(8px);
  padding: 16px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.nav-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo-link {
  display: flex;
  align-items: center;
}

.logo-img {
  height: 50px;
  width: auto;
  transition: var(--transition);
}

.logo-link:hover .logo-img {
  opacity: 0.85;
}

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-links a {
  font-size: 1.05rem;
  font-weight: 500;
}

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

/* Hero Section */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, #0D0F12 5%, rgba(13, 15, 18, 0.8) 50%, rgba(13, 15, 18, 0.3) 100%);
}

.hero-content {
  max-width: 650px;
  position: relative;
  z-index: 1;
}

.hero-title {
  font-size: 4rem;
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 24px;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: #D1D5DB;
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: flex-start;
}

.hero-note {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* Animations (To be triggered by JS) */
.fade-in-up {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s cubic-bezier(0.25, 1, 0.5, 1), transform 0.8s cubic-bezier(0.25, 1, 0.5, 1);
}

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

.delay-1 { transition-delay: 0.15s; }
.delay-2 { transition-delay: 0.3s; }
.delay-3 { transition-delay: 0.45s; }

/* Problems Section */
.problems {
  background-color: var(--color-bg-light);
}

.problems-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.problem-card {
  background: var(--color-bg);
  padding: 30px 28px;
  border-radius: 12px;
  border-top: 3px solid var(--color-border);
  transition: var(--transition);
}

.problem-card:hover {
  border-top-color: var(--color-gold);
  transform: translateY(-5px);
}

.problem-icon {
  color: var(--color-gold);
  margin-bottom: 18px;
  display: flex;
  align-items: center;
}

.problem-card h3 {
  font-size: 1.25rem;
  margin-bottom: 16px;
  color: #FFF;
}

.problem-card p {
  color: var(--color-text-muted);
  font-size: 1.05rem;
}

/* Benefits Section */
.benefits-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.benefit-card {
  padding: 36px 28px;
  position: relative;
  overflow: hidden;
}

.benefit-number {
  font-family: var(--font-en);
  font-size: 4rem;
  font-weight: 900;
  color: rgba(205, 178, 125, 0.1);
  position: absolute;
  top: 16px;
  right: 24px;
  line-height: 1;
}

.benefit-title {
  font-size: 1.25rem;
  margin-bottom: 16px;
  color: var(--color-gold);
  position: relative;
  z-index: 1;
}

.benefit-card p {
  color: var(--color-text-muted);
  font-size: 1.05rem;
  position: relative;
  z-index: 1;
}

/* Brands Section */
.brands {
  background-color: var(--color-bg-light);
}

.brands-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  margin-bottom: 24px;
}

.brand-item {
  font-family: var(--font-en);
  font-size: 1.125rem;
  font-weight: 600;
  padding: 16px 32px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  color: var(--color-text);
  transition: var(--transition);
}

.brand-item:hover {
  border-color: var(--color-gold);
  color: var(--color-gold);
}

.brands-note {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

/* Flow Section */
.flow-steps {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  position: relative;
}

.flow-step {
  flex: 1;
  text-align: center;
  padding: 0 16px;
}

.step-num {
  width: 64px;
  height: 64px;
  margin: 0 auto 24px;
  background: var(--color-glass-bg);
  border: 1px solid var(--color-gold);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-en);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-gold);
}

.flow-step h3 {
  font-size: 1.125rem;
  margin-bottom: 12px;
}

.flow-step p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.flow-divider {
  width: 40px;
  height: 2px;
  background: var(--color-border);
  margin-top: 32px;
}

/* FAQ Section */
.faq {
  background-color: var(--color-bg-light);
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

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

.faq-item:last-child {
  border-bottom: none;
}

.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: none;
  border: none;
  color: var(--color-text);
  font-size: 1.125rem;
  font-weight: 600;
  padding: 18px 0;
  cursor: pointer;
  text-align: left;
  font-family: inherit;
}

.faq-question:hover {
  color: var(--color-gold);
}

.faq-icon {
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--color-gold);
  transition: transform 0.3s ease;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}

.faq-answer p {
  padding-bottom: 24px;
  color: var(--color-text-muted);
  font-size: 1.05rem;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-item.active .faq-answer {
  max-height: 200px;
}

/* Contact Section */
.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  padding: 48px;
}

.contact-info .section-title {
  text-align: left;
  margin-bottom: 24px;
}

.contact-info p {
  color: var(--color-text-muted);
  margin-bottom: 40px;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-detail-item {
  display: flex;
  flex-direction: column;
}

.contact-detail-item .label {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 4px;
}

.contact-detail-item .value {
  font-size: 1.5rem;
  font-weight: 700;
  font-family: var(--font-en);
}

.contact-detail-item .sub-value {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-size: 0.875rem;
  font-weight: 600;
}

.required {
  background: var(--color-gold);
  color: #000;
  font-size: 0.65rem;
  padding: 2px 6px;
  border-radius: 4px;
  margin-left: 8px;
  vertical-align: middle;
}

.form-group input,
.form-group textarea {
  width: 100%;
  background: rgba(0,0,0,0.2);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 12px 16px;
  color: var(--color-text);
  font-family: inherit;
  transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-gold);
}

.btn-submit {
  width: 100%;
  padding: 16px;
  font-size: 1.125rem;
  border-radius: 6px;
}

/* LINE Button */
.btn-line {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  background: #06C755;
  color: #fff;
  border-radius: 6px;
  font-weight: 700;
  font-size: 1rem;
  font-family: var(--font-jp);
  transition: var(--transition);
  border: none;
  cursor: pointer;
  text-decoration: none;
}

.btn-line:hover {
  background: #05b34c;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(6, 199, 85, 0.35);
  color: #fff;
}

/* Footer */
.footer {
  background: #000;
  padding: 48px 0 18px;
  border-top: 1px solid var(--color-border);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 36px;
}

.footer-brand p {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  margin-top: 8px;
}

.footer-links {
  display: flex;
  gap: 24px;
}

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

.footer-links a:hover {
  color: var(--color-gold);
}

.footer-bottom {
  text-align: center;
  color: #4B5563;
  font-size: 0.75rem;
  font-family: var(--font-en);
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.05);
}

/* Responsive */
@media (max-width: 992px) {
  .hero-title { font-size: 3rem; }
  .problems-grid, .benefits-grid { grid-template-columns: 1fr; }
  .contact-wrapper { grid-template-columns: 1fr; padding: 40px 24px; }
  .flow-steps { flex-direction: column; align-items: center; gap: 32px; }
  .flow-divider { width: 2px; height: 40px; margin: 0; }
  .flow-step { width: 100%; max-width: 300px; }
}

@media (max-width: 768px) {
  .nav-links, .nav-cta { display: none; }
  .hero-title { font-size: 2.25rem; }
  .hero-content { padding-top: 40px; }
  .section-title { font-size: 1.75rem; }
  .footer-content { flex-direction: column; gap: 32px; text-align: center; }
  .footer-links { flex-direction: column; gap: 16px; align-items: center; }
}