/* ===== CSS Variables ===== */
:root {
  --primary: #7c3aed;
  --primary-light: #a78bfa;
  --primary-dark: #5b21b6;
  --accent: #f472b6;
  --bg: #0f0f1a;
  --bg-light: #1a1a2e;
  --bg-card: #16162a;
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --text-heading: #f8fafc;
  --border: #2d2d4a;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  --transition: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", "Meiryo", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.8;
  overflow-x: hidden;
}

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

ul {
  list-style: none;
}

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

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: 2px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  border-color: transparent;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(124, 58, 237, 0.4);
}

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

.btn-outline:hover {
  border-color: var(--primary-light);
  color: var(--primary-light);
}

.btn-block {
  width: 100%;
  text-align: center;
}

/* ===== Header / Nav ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(15, 15, 26, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition);
}

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

.nav-cta {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 0 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 600px 400px at 30% 20%, rgba(124, 58, 237, 0.15), transparent),
    radial-gradient(ellipse 500px 300px at 70% 80%, rgba(244, 114, 182, 0.1), transparent);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-label {
  display: inline-block;
  padding: 6px 20px;
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  color: var(--text-heading);
  line-height: 1.2;
  margin-bottom: 24px;
}

.hero-accent {
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 auto 40px;
  line-height: 2;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 60px;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-number {
  font-size: 2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ===== Section Common ===== */
.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--primary-light);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 800;
  color: var(--text-heading);
  margin-bottom: 16px;
}

.section-description {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 500px;
  margin: 0 auto;
}

/* ===== Features ===== */
.features {
  padding: 100px 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 28px;
  transition: all var(--transition);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: 0 8px 30px rgba(124, 58, 237, 0.15);
}

.feature-icon {
  font-size: 2.2rem;
  margin-bottom: 16px;
}

.feature-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 10px;
}

.feature-text {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.8;
}

/* ===== Plans ===== */
.plans {
  padding: 100px 0;
  background: var(--bg-light);
}

.plans-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: start;
}

.plan-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px 32px;
  transition: all var(--transition);
}

.plan-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.plan-popular {
  border-color: var(--primary);
  box-shadow: 0 0 40px rgba(124, 58, 237, 0.15);
}

.plan-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 6px 20px;
  border-radius: 100px;
  white-space: nowrap;
}

.plan-header {
  margin-bottom: 24px;
}

.plan-name {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 4px;
}

.plan-description {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.plan-price {
  margin-bottom: 28px;
}

.price-amount {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-heading);
}

.price-period {
  font-size: 1rem;
  color: var(--text-muted);
}

.plan-features {
  margin-bottom: 32px;
}

.plan-features li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 12px;
  font-size: 0.9rem;
  color: var(--text);
}

.plan-features li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--primary-light);
  font-weight: 700;
}

/* ===== FAQ ===== */
.faq {
  padding: 100px 0;
}

.faq-list {
  max-width: 720px;
  margin: 0 auto;
}

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

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-heading);
  text-align: left;
  font-family: inherit;
  transition: color var(--transition);
}

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

.faq-icon {
  font-size: 1.4rem;
  color: var(--primary-light);
  transition: transform var(--transition);
  flex-shrink: 0;
  margin-left: 16px;
}

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

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

.faq-item.active .faq-answer {
  max-height: 300px;
  padding-bottom: 20px;
}

.faq-answer p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.8;
}

/* ===== Contact ===== */
.contact {
  padding: 100px 0;
  background: var(--bg-light);
}

.contact-form {
  max-width: 600px;
  margin: 0 auto;
}

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

.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-heading);
  margin-bottom: 8px;
}

.form-input {
  width: 100%;
  padding: 14px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 1rem;
  font-family: inherit;
  transition: border-color var(--transition);
  outline: none;
}

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

.form-input:focus {
  border-color: var(--primary);
}

select.form-input {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2394a3b8' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 40px;
}

textarea.form-input {
  resize: vertical;
  min-height: 120px;
}

/* ===== Footer ===== */
.footer {
  padding: 60px 0 0;
  border-top: 1px solid var(--border);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  gap: 40px;
  padding-bottom: 40px;
}

.footer-logo {
  font-size: 1.3rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: inline-block;
  margin-bottom: 12px;
}

.footer-text {
  font-size: 0.85rem;
  color: var(--text-muted);
  max-width: 320px;
  line-height: 1.8;
}

.footer-links {
  display: flex;
  gap: 60px;
}

.footer-column h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 16px;
}

.footer-column li {
  margin-bottom: 10px;
}

.footer-column a {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-column a:hover {
  color: var(--primary-light);
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 20px 0;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ===== Scroll Animations ===== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ===== Form Success Message ===== */
.form-success {
  text-align: center;
  padding: 40px 20px;
}

.form-success h3 {
  font-size: 1.3rem;
  color: var(--text-heading);
  margin-bottom: 12px;
}

.form-success p {
  color: var(--text-muted);
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .plans-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto;
  }

  .footer-content {
    flex-direction: column;
  }
}

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

  .nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    flex-direction: column;
    background: rgba(15, 15, 26, 0.98);
    backdrop-filter: blur(12px);
    padding: 32px 20px;
    gap: 24px;
    transform: translateY(-120%);
    transition: transform 0.4s ease;
    border-bottom: 1px solid var(--border);
  }

  .nav-menu.open {
    transform: translateY(0);
  }

  .hero-stats {
    gap: 24px;
  }

  .stat-number {
    font-size: 1.5rem;
  }

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

/* ===== Legal pages ===== */
.legal-page {
  padding: 120px 0 80px;
  min-height: 100vh;
}

.legal-page h1 {
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 800;
  color: var(--text-heading);
  margin-bottom: 40px;
  text-align: center;
}

.legal-content {
  max-width: 760px;
  margin: 0 auto;
}

.legal-content h2 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-heading);
  margin-top: 40px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.legal-content p,
.legal-content li {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.9;
  margin-bottom: 8px;
}

.legal-content ul {
  padding-left: 20px;
  list-style: disc;
}

.legal-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
}

.legal-content th,
.legal-content td {
  text-align: left;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}

.legal-content th {
  color: var(--text-heading);
  font-weight: 600;
  width: 30%;
  background: var(--bg-card);
}

.legal-content td {
  color: var(--text-muted);
}

.legal-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 32px;
  font-size: 0.9rem;
  color: var(--primary-light);
}

.legal-back:hover {
  color: var(--accent);
}