/* =============================================
   INSAS Homepage Styles
   ============================================= */

:root {
  --primary: #2B3896;
  --primary-dark: #1e2968;
  --primary-light: #eef0fa;
  --text-primary: #111827;
  --text-secondary: #4b5563;
  --text-muted: #9ca3af;
  --bg-white: #ffffff;
  --bg-light: #f8f9fc;
  --border: #e5e7eb;
  --border-dark: #d1d5db;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.07), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.1);
  --radius: 8px;
  --radius-lg: 12px;
  --header-h: 64px;
}

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

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

body {
  font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--text-primary);
  background: var(--bg-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

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

a:hover {
  text-decoration: underline;
}

ul {
  list-style: none;
}

/* ===== CONTAINER ===== */
.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  border: 1.5px solid transparent;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.15s, color 0.15s, border-color 0.15s, opacity 0.15s;
  font-family: inherit;
}

.btn-primary {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
}

.btn-primary:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  text-decoration: none;
  color: #fff;
}

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

.btn-outline:hover {
  background: var(--bg-light);
  text-decoration: none;
  color: var(--text-primary);
}

.btn-lg {
  padding: 13px 28px;
  font-size: 1rem;
}

.btn-block {
  width: 100%;
  display: flex;
}

/* ===== SECTION COMMON ===== */
section {
  padding: 96px 0;
}

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

.section-label {
  display: inline-block;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 14px;
}

.section-title {
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-primary);
  margin-bottom: 18px;
}

.section-title-left {
  font-size: clamp(1.6rem, 2.8vw, 2.2rem);
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-primary);
  margin-bottom: 18px;
}

.section-desc {
  font-size: 1.0rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto 56px;
  text-align: center;
  line-height: 1.8;
}

/* ===== HEADER ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  height: var(--header-h);
}

.header-inner {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 32px;
  justify-content: space-between;
}

.header-logo img {
  display: block;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.header-nav a {
  font-size: 0.875rem;
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: 6px;
  text-decoration: none;
  transition: color 0.15s, background 0.15s;
}

.header-nav a:hover {
  color: var(--text-primary);
  background: var(--bg-light);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: 16px;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 0.2s;
}

/* Mobile Menu */
.mobile-menu {
  display: none;
  position: fixed;
  top: var(--header-h);
  left: 0;
  right: 0;
  background: var(--bg-white);
  border-bottom: 1px solid var(--border);
  z-index: 99;
  padding: 16px 24px 24px;
}

.mobile-menu.open {
  display: block;
}

.mobile-menu nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.mobile-menu nav a {
  font-size: 0.95rem;
  color: var(--text-secondary);
  padding: 10px 12px;
  border-radius: 6px;
  text-decoration: none;
}

.mobile-menu nav a:hover {
  background: var(--bg-light);
  color: var(--text-primary);
}

.mobile-menu nav .btn {
  margin-top: 12px;
  color: #fff;
}

/* ===== HERO ===== */
.hero {
  padding: 80px 0 96px;
  overflow: hidden;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  padding: 5px 12px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 500;
  margin-bottom: 24px;
  border: 1px solid #c5caf0;
}

.hero-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-mockup {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
  background: var(--bg-light);
}

.mockup-img {
  width: 100%;
  display: block;
}

/* ===== ABOUT ===== */
.about {
  text-align: center;
}

.about .section-title {
  margin-bottom: 24px;
}

.about .section-desc,
.about > .container > p {
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto 56px;
  font-size: 1.0rem;
  line-height: 1.85;
  text-align: center;
}

.about-stats {
  display: flex;
  justify-content: center;
  align-items: stretch;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg-white);
  overflow: hidden;
  margin-top: 24px;
}

.stat-item {
  flex: 1;
  padding: 40px 32px;
  text-align: center;
}

.stat-number {
  font-size: 3rem;
  font-weight: 700;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.stat-number span {
  font-size: 1.2rem;
  font-weight: 600;
  margin-left: 2px;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.stat-divider {
  width: 1px;
  background: var(--border);
  flex-shrink: 0;
}

/* ===== FEATURES ===== */
.features {
  text-align: center;
}

.features .section-desc {
  margin-bottom: 56px;
}

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

.feature-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  text-align: left;
  transition: box-shadow 0.2s, border-color 0.2s;
}

.feature-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--border-dark);
}

.feature-icon {
  width: 44px;
  height: 44px;
  background: var(--primary-light);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--primary);
}

.feature-icon svg {
  width: 22px;
  height: 22px;
}

.feature-icon--gcal {
  background: #e8f5e9;
  color: #2e7d32;
}

.feature-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
  line-height: 1.4;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

.feature-link {
  display: inline-block;
  margin-top: 14px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--primary);
  text-decoration: none;
}

.feature-link:hover {
  text-decoration: underline;
}

/* ===== GOOGLE CALENDAR SECTION ===== */
.gcal-section {
  padding: 96px 0;
}

.gcal-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 72px;
  align-items: center;
}

.gcal-text .section-label {
  display: block;
  margin-bottom: 14px;
}

.gcal-text p {
  font-size: 0.975rem;
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 24px;
}

.gcal-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 28px;
}

.gcal-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.925rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.check-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  color: #2e7d32;
  margin-top: 1px;
}

.check-icon svg {
  width: 20px;
  height: 20px;
}

.gcal-note {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 14px 16px;
  background: #fffde7;
  border: 1px solid #f9e79f;
  border-radius: var(--radius);
  font-size: 0.85rem;
  color: #7d6608;
  line-height: 1.65;
}

.gcal-note svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  margin-top: 2px;
  color: #b7860b;
}

.gcal-note a {
  color: #7d6608;
  text-decoration: underline;
}

/* ===== USER TYPES ===== */
.users {
  text-align: center;
}

.users .section-desc {
  margin-bottom: 40px;
}

.users-tabs {
  display: flex;
  gap: 4px;
  background: var(--bg-light);
  padding: 4px;
  border-radius: var(--radius);
  width: fit-content;
  margin: 0 auto 40px;
  border: 1px solid var(--border);
}

.tab-btn {
  padding: 9px 24px;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-family: inherit;
  transition: background 0.15s, color 0.15s;
}

.tab-btn.active {
  background: var(--bg-white);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

.tab-panel {
  display: none;
  text-align: left;
}

.tab-panel.active {
  display: block;
}

.tab-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 48px;
  background: var(--bg-white);
}

.tab-text h3 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.tab-role-desc {
  font-size: 0.925rem;
  color: var(--text-secondary);
  margin-bottom: 28px;
  line-height: 1.75;
}

.feature-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.list-dot {
  width: 6px;
  height: 6px;
  background: var(--primary);
  border-radius: 50%;
  margin-top: 8px;
  flex-shrink: 0;
}

.feature-list li > div {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.feature-list li strong {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.4;
}

.feature-list li span {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ===== MOCKUP PLACEHOLDER ===== */
.mockup-placeholder {
  width: 100%;
  aspect-ratio: 4/3;
  background: var(--bg-light);
  border: 1.5px dashed var(--border-dark);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
}

.mockup-placeholder--sm {
  aspect-ratio: 5/4;
}

.mockup-ph-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  color: var(--text-muted);
}

.mockup-ph-inner svg {
  width: 48px;
  height: 48px;
}

.mockup-ph-inner p {
  font-size: 0.8rem;
  text-align: center;
  max-width: 180px;
  line-height: 1.5;
}

/* ===== BENEFITS ===== */
.benefits {
  text-align: center;
}

.benefits .section-desc {
  margin-bottom: 56px;
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.benefit-item {
  background: var(--bg-white);
  padding: 36px 32px;
  text-align: left;
}

.benefit-num {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--primary);
  margin-bottom: 14px;
  font-family: 'Noto Sans JP', monospace;
}

.benefit-item h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
  line-height: 1.4;
}

.benefit-item p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ===== PRICING ===== */
.pricing {
  text-align: center;
}

.pricing .section-desc {
  margin-bottom: 32px;
}

.pricing-note-box {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 20px;
  background: var(--primary-light);
  border: 1px solid #c5caf0;
  border-radius: var(--radius);
  max-width: 720px;
  margin: 0 auto 48px;
  text-align: left;
}

.pricing-note-box svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--primary);
}

.pricing-note-box p {
  font-size: 0.875rem;
  color: var(--primary-dark);
  line-height: 1.7;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}

.pricing-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-white);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: box-shadow 0.2s;
}

.pricing-card:hover {
  box-shadow: var(--shadow-md);
}

.pricing-card--highlight {
  border-color: var(--primary);
  box-shadow: 0 0 0 1px var(--primary);
}

.pricing-card-badge {
  position: absolute;
  top: 16px;
  right: 16px;
  background: var(--primary);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 100px;
}

.pricing-card-header {
  padding: 28px 28px 20px;
  border-bottom: 1px solid var(--border);
}

.pricing-card-header h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.pricing-card-header p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.pricing-card-body {
  padding: 24px 28px;
  flex: 1;
  text-align: left;
}

.pricing-card-body ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.pricing-card-body ul li {
  font-size: 0.875rem;
  color: var(--text-secondary);
  padding-left: 16px;
  position: relative;
  line-height: 1.6;
}

.pricing-card-body ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 9px;
  width: 5px;
  height: 5px;
  background: var(--border-dark);
  border-radius: 50%;
}

.pricing-card-footer {
  padding: 20px 28px 24px;
}

.payment-methods {
  display: flex;
  align-items: center;
  gap: 12px;
  justify-content: center;
  padding-top: 16px;
}

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

.payment-items {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}

.payment-tag {
  padding: 4px 12px;
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* ===== COMPANY ===== */
.company {
  text-align: center;
}

.company-inner {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 64px;
  align-items: start;
  text-align: left;
}

.company-logo-area {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 180px;
}

.company-tagline {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
}

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

.company-table th,
.company-table td {
  padding: 16px 20px;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
  line-height: 1.7;
}

.company-table th {
  width: 160px;
  font-weight: 500;
  color: var(--text-muted);
  white-space: nowrap;
}

.company-table td {
  color: var(--text-primary);
}

.company-table td small {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
  line-height: 1.6;
}

.company-table td a {
  color: var(--primary);
}

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

/* ===== CONTACT ===== */
.contact {
  text-align: center;
}

.contact .section-desc {
  margin-bottom: 56px;
}

.contact-inner {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 64px;
  text-align: left;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.contact-info-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.contact-info-icon {
  width: 40px;
  height: 40px;
  background: var(--primary-light);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--primary);
}

.contact-info-icon svg {
  width: 20px;
  height: 20px;
}

.contact-info-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 3px;
}

.contact-info-item a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-primary);
  text-decoration: none;
  display: block;
}

.contact-info-item a:hover {
  text-decoration: underline;
  color: var(--primary);
}

.contact-hours {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Contact Form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
}

.required {
  color: #dc2626;
  margin-left: 2px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-family: inherit;
  color: var(--text-primary);
  background: var(--bg-white);
  transition: border-color 0.15s;
  outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(43, 56, 150, 0.1);
}

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

.form-group select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%239ca3af' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 16px;
  padding-right: 36px;
}

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

.form-check {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.form-check input[type="checkbox"] {
  width: 16px;
  height: 16px;
  margin-top: 2px;
  flex-shrink: 0;
  accent-color: var(--primary);
  cursor: pointer;
}

.form-check label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  cursor: pointer;
}

.form-check label a {
  color: var(--primary);
  text-decoration: underline;
}

.form-message {
  padding: 12px 16px;
  border-radius: var(--radius);
  font-size: 0.875rem;
  line-height: 1.6;
  margin-bottom: 30px;
}

.form-message.success {
  background: #f0fdf4;
  color: #15803d;
  border: 1px solid #bbf7d0;
}

.form-message.error {
  background: #fef2f2;
  color: #dc2626;
  border: 1px solid #fecaca;
}

.btn-submit {
  align-self: flex-start;
}

/* ===== FOOTER ===== */
.site-footer {
  background: var(--text-primary);
  color: #e5e7eb;
  padding: 64px 0 32px;
}

.footer-top {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 64px;
  padding-bottom: 48px;
  border-bottom: 1px solid #374151;
  margin-bottom: 32px;
}

.footer-brand img {
  filter: brightness(0) invert(1);
  margin-bottom: 16px;
}

.footer-brand p {
  font-size: 0.85rem;
  color: #9ca3af;
  line-height: 1.7;
}

.footer-links-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

.footer-links-title {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #d1d5db;
  margin-bottom: 14px;
}

.footer-links-col ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-links-col ul li a {
  font-size: 0.875rem;
  color: #9ca3af;
  text-decoration: none;
  transition: color 0.15s;
}

.footer-links-col ul li a:hover {
  color: #e5e7eb;
}

.footer-bottom {
  text-align: center;
}

.footer-bottom p {
  font-size: 0.82rem;
  color: #6b7280;
}

/* ===== BACK TO TOP ===== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
  z-index: 50;
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
}

.back-to-top:hover {
  background: var(--bg-light);
}

.back-to-top svg {
  width: 18px;
  height: 18px;
  color: var(--text-primary);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .benefits-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 900px) {
  .hero .container {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-visual {
    width: 100%;
  }

  .gcal-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .tab-content {
    grid-template-columns: 1fr;
    gap: 36px;
    padding: 32px;
  }

  .contact-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .company-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .footer-links-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin: 0 auto 40px;
  }

  .about-stats {
    flex-direction: column;
  }

  .stat-divider {
    width: 100%;
    height: 1px;
  }
}

@media (max-width: 768px) {
  section {
    padding: 72px 0;
  }

  .header-nav {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .hero {
    padding: 56px 0 0;
  }

  .hero-title {
    font-size: 2rem;
  }

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

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

  .tab-content {
    padding: 24px;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .footer-links-grid {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
  }
}

@media (max-width: 480px) {
  .footer-links-grid {
    grid-template-columns: 1fr;
  }

  .pricing-note-box {
    flex-direction: column;
  }
}