/* ==========================================================================
   Sisti - Modern Japanese English Training Stylesheet
   Mobile-First, High-Performance, Accessible Design
   ========================================================================== */

:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-dark: #0f172a;
  --primary-light: #eff6ff;
  --secondary: #0d9488;
  --secondary-hover: #0f766e;
  --accent: #f59e0b;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --text-light: #f8fafc;
  --bg-page: #f8fafc;
  --bg-card: #ffffff;
  --bg-alt: #f1f5f9;
  --border-color: #e2e8f0;
  --border-focus: #3b82f6;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 16px 36px rgba(15, 23, 42, 0.12);
  --font-sans: 'Noto Sans JP', 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --max-w: 1200px;
}

*, *::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);
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.8;
  letter-spacing: 0.02em;
  overflow-x: hidden;
}

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

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

a:hover {
  color: var(--primary-hover);
}

button, input, select, textarea {
  font-family: inherit;
  font-size: 1rem;
}

.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: var(--transition);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.brand-logo img {
  height: 48px;
  width: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  color: var(--text-main);
  font-weight: 500;
  font-size: 0.95rem;
}

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

.header-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  background: var(--primary);
  color: #ffffff !important;
  font-weight: 700;
  font-size: 0.95rem;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.25);
  transition: var(--transition);
}

.header-cta:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(37, 99, 235, 0.35);
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.mobile-toggle span {
  display: block;
  width: 26px;
  height: 2px;
  background: var(--text-main);
  margin: 6px 0;
  transition: var(--transition);
}

/* Hero Section */
.hero-section {
  position: relative;
  padding: 80px 0 100px;
  background: linear-gradient(180deg, #f0f7ff 0%, #ffffff 100%);
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--primary-light);
  color: var(--primary);
  border: 1px solid rgba(37, 99, 235, 0.2);
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.hero-title {
  font-size: 2.6rem;
  font-weight: 800;
  line-height: 1.35;
  color: var(--primary-dark);
  margin-bottom: 24px;
}

.hero-title span {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.12rem;
  color: var(--text-muted);
  line-height: 1.9;
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px 36px;
  background: linear-gradient(135deg, var(--primary) 0%, #1d4ed8 100%);
  color: #ffffff;
  font-size: 1.05rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.3);
  transition: var(--transition);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #1d4ed8 0%, #1e40af 100%);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.4);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 16px 30px;
  background: var(--bg-card);
  color: var(--text-main);
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.btn-secondary:hover {
  background: var(--bg-alt);
  border-color: #cbd5e1;
}

.trust-strip {
  display: flex;
  align-items: center;
  gap: 32px;
  padding-top: 24px;
  border-top: 1px solid rgba(226, 232, 240, 0.8);
}

.trust-item {
  display: flex;
  flex-direction: column;
}

.trust-item .trust-num {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--primary-dark);
  font-family: 'Plus Jakarta Sans', sans-serif;
}

.trust-item .trust-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 500;
}

.hero-image-wrap {
  position: relative;
}

.hero-img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  object-fit: cover;
}

.hero-float-card {
  position: absolute;
  bottom: -20px;
  left: -20px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  padding: 16px 22px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 14px;
}

.float-icon {
  width: 44px;
  height: 44px;
  background: #e0f2fe;
  color: var(--primary);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.float-text h4 {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-main);
}

.float-text p {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* Section Common Styling */
.section {
  padding: 90px 0;
}

.section-alt {
  background: var(--bg-alt);
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 60px;
}

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--primary-dark);
  line-height: 1.4;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.8;
}

/* Value Props / Benefits Grid (6 blocks) */
.benefits-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 30px;
}

.benefit-card {
  background: var(--bg-card);
  padding: 36px 30px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.benefit-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(37, 99, 235, 0.3);
}

.benefit-icon {
  width: 56px;
  height: 56px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
}

.benefit-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: 14px;
}

.benefit-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.85;
}

/* How It Works / Steps (4 steps) */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  position: relative;
}

.step-card {
  background: var(--bg-card);
  padding: 32px 26px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  position: relative;
}

.step-number {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 2.2rem;
  font-weight: 800;
  color: rgba(37, 99, 235, 0.18);
  line-height: 1;
  margin-bottom: 16px;
}

.step-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: 12px;
}

.step-text {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.8;
}

/* Services / Features Grid (6 items) */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 30px;
}

.service-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

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

.service-card-body {
  padding: 32px 28px;
}

.service-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 12px;
  background: #f0fdf4;
  color: var(--secondary);
  border-radius: var(--radius-full);
  margin-bottom: 14px;
}

.service-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: 12px;
}

.service-desc {
  font-size: 0.94rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 18px;
}

.service-features {
  list-style: none;
  padding-top: 14px;
  border-top: 1px solid var(--border-color);
}

.service-features li {
  font-size: 0.88rem;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.service-features li svg {
  color: var(--secondary);
  flex-shrink: 0;
}

/* Testimonials / Social Proof (3 items) */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 30px;
}

.testimonial-card {
  background: var(--bg-card);
  padding: 34px 28px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.testimonial-stars {
  color: var(--accent);
  margin-bottom: 16px;
  display: flex;
  gap: 4px;
}

.testimonial-quote {
  font-size: 0.95rem;
  color: var(--text-main);
  line-height: 1.85;
  margin-bottom: 24px;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 14px;
}

.author-avatar {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--border-color);
}

.author-info h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--primary-dark);
}

.author-info p {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* FAQ Accordion (8 items) */
.faq-wrap {
  max-width: 840px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  overflow: hidden;
  transition: var(--transition);
}

.faq-question {
  width: 100%;
  padding: 22px 28px;
  background: none;
  border: none;
  text-align: left;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--primary-dark);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.faq-icon {
  width: 22px;
  height: 22px;
  color: var(--primary);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
  padding: 0 28px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.85;
}

.faq-item.active .faq-answer {
  max-height: 1000px;
  padding-bottom: 24px;
  transition: max-height 0.3s cubic-bezier(1, 0, 1, 0);
}

/* About Us Section */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
}

.about-img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  object-fit: cover;
}

.about-text h3 {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--primary-dark);
  margin-bottom: 20px;
  line-height: 1.4;
}

.about-text p {
  font-size: 0.98rem;
  color: var(--text-muted);
  line-height: 1.9;
  margin-bottom: 20px;
}

/* Lead Generation Form Section */
.form-section {
  padding: 100px 0;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  color: #ffffff;
  position: relative;
}

.form-wrapper {
  max-width: 720px;
  margin: 0 auto;
  background: #ffffff;
  color: var(--text-main);
  padding: 48px 40px;
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.25);
}

.form-header {
  text-align: center;
  margin-bottom: 36px;
}

.form-header h3 {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--primary-dark);
  margin-bottom: 12px;
}

.form-header p {
  font-size: 0.95rem;
  color: var(--text-muted);
}

.lead-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-main);
}

.form-group label span.required {
  color: #ef4444;
  margin-left: 4px;
}

.form-control {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: #ffffff;
  color: var(--text-main);
  font-size: 0.95rem;
  transition: var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.form-checkbox {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-top: 6px;
}

.form-checkbox input[type="checkbox"] {
  margin-top: 4px;
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
  cursor: pointer;
}

.form-checkbox label {
  font-size: 0.84rem;
  color: var(--text-muted);
  line-height: 1.6;
  cursor: pointer;
}

.form-checkbox label a {
  text-decoration: underline;
}

.btn-submit {
  width: 100%;
  padding: 18px;
  font-size: 1.1rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--primary) 0%, #1d4ed8 100%);
  color: #ffffff;
  border: none;
  cursor: pointer;
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.35);
  transition: var(--transition);
  margin-top: 10px;
}

.btn-submit:hover:not(:disabled) {
  background: linear-gradient(135deg, #1d4ed8 0%, #1e40af 100%);
  transform: translateY(-2px);
}

.btn-submit:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.form-reassurance {
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 14px;
  line-height: 1.6;
}

/* Success & Error Messages */
.form-status {
  display: none;
  padding: 24px;
  border-radius: var(--radius-md);
  text-align: center;
  margin-top: 20px;
}

.form-status.success {
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  color: #166534;
}

.form-status.error {
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: #991b1b;
}

/* Footer & Legal */
.site-footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 70px 0 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand img {
  height: 44px;
  filter: brightness(0) invert(1);
  margin-bottom: 18px;
}

.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.8;
  margin-bottom: 16px;
}

.footer-col h4 {
  color: #ffffff;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 18px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: #94a3b8;
  font-size: 0.88rem;
}

.footer-links a:hover {
  color: #ffffff;
}

.footer-bottom {
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.84rem;
}

.back-to-top {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #94a3b8;
  background: rgba(255, 255, 255, 0.06);
  padding: 8px 16px;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
}

.back-to-top:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.12);
}

/* Cookie Notice Banner */
.cookie-banner {
  position: fixed;
  bottom: 24px;
  left: 24px;
  right: 24px;
  max-width: 580px;
  margin: 0 auto;
  background: rgba(15, 23, 42, 0.96);
  backdrop-filter: blur(10px);
  color: #ffffff;
  padding: 20px 24px;
  border-radius: var(--radius-md);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.15);
  z-index: 9999;
  display: none;
  flex-direction: column;
  gap: 14px;
  animation: slideUp 0.4s ease;
}

@keyframes slideUp {
  from { transform: translateY(100px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.cookie-text {
  font-size: 0.85rem;
  line-height: 1.6;
  color: #cbd5e1;
}

.cookie-text a {
  color: #38bdf8;
  text-decoration: underline;
}

.cookie-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
}

.btn-cookie-accept {
  padding: 8px 20px;
  background: var(--primary);
  color: #ffffff;
  border: none;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
}

.btn-cookie-accept:hover {
  background: var(--primary-hover);
}

.btn-cookie-close {
  padding: 8px 16px;
  background: transparent;
  color: #94a3b8;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  cursor: pointer;
}

.btn-cookie-close:hover {
  color: #ffffff;
  border-color: #ffffff;
}

/* Legal Pages Styling */
.legal-page {
  padding: 80px 0 120px;
  background: #ffffff;
}

.legal-container {
  max-width: 860px;
  margin: 0 auto;
}

.legal-header {
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
}

.legal-header h1 {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--primary-dark);
  margin-bottom: 12px;
}

.legal-header p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.legal-content section {
  margin-bottom: 36px;
}

.legal-content h2 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: 14px;
  padding-left: 12px;
  border-left: 4px solid var(--primary);
}

.legal-content p {
  font-size: 0.96rem;
  color: var(--text-main);
  line-height: 1.9;
  margin-bottom: 14px;
}

.legal-content ul, .legal-content ol {
  padding-left: 24px;
  margin-bottom: 16px;
}

.legal-content li {
  font-size: 0.95rem;
  color: var(--text-main);
  line-height: 1.85;
  margin-bottom: 8px;
}

/* Responsive Media Queries */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-actions, .trust-strip {
    justify-content: center;
  }
  .hero-image-wrap {
    max-width: 600px;
    margin: 0 auto;
  }
  .about-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links, .header-cta {
    display: none;
  }
  .mobile-toggle {
    display: block;
  }
  .nav-links.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 80px;
    left: 0;
    width: 100%;
    background: #ffffff;
    padding: 24px;
    box-shadow: var(--shadow-lg);
    border-bottom: 1px solid var(--border-color);
  }
  .hero-title {
    font-size: 2rem;
  }
  .section-title {
    font-size: 1.8rem;
  }
  .form-row {
    grid-template-columns: 1fr;
  }
  .form-wrapper {
    padding: 32px 20px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
}