/* ============================================================================
   Tascook Landing Page Design System
   - Light, practical, clear information hierarchy
   - Navy (#1e3a5f) and teal (#0891b2) accents on white base
   - Japanese-forward typography with system fonts
   - Responsive: mobile-first, desktop 1200px max-width
   ============================================================================ */

:root {
  /* Colors */
  --color-white: #ffffff;
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-900: #111827;
  
  --color-navy: #1e3a5f;
  --color-navy-light: #2d4a75;
  --color-navy-dark: #172a48;
  
  --color-teal: #0891b2;
  --color-teal-light: #06b6d4;
  --color-teal-dark: #0369a1;
  
  --color-blue: #3b82f6;
  --color-emerald: #059669;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  
  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Hiragino Sans', 'Yu Gothic', sans-serif;
  --font-mono: 'Courier New', monospace;
  
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  
  --line-height-tight: 1.3;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  
  /* Border */
  --border-radius: 0.375rem;
  --border-radius-lg: 0.5rem;
  --border-radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
}

/* ============================================================================
   Reset & Base Styles
   ============================================================================ */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--line-height-normal);
  color: var(--color-gray-700);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: var(--line-height-tight);
  color: var(--color-navy);
}

h1 {
  font-size: var(--text-3xl);
}

@media (min-width: 768px) {
  h1 { font-size: var(--text-4xl); }
}

h2 {
  font-size: var(--text-2xl);
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-lg);
}

h3 {
  font-size: var(--text-xl);
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
}

h4, h5, h6 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-md);
}

p {
  margin-bottom: var(--space-md);
}

p:last-child {
  margin-bottom: 0;
}

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

a:hover {
  color: var(--color-teal-dark);
}

a:focus {
  outline: 2px solid var(--color-teal);
  outline-offset: 2px;
  border-radius: 2px;
}

strong {
  font-weight: 600;
  color: var(--color-navy);
}

/* ============================================================================
   Layout Primitives
   ============================================================================ */

.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-md);
  padding-right: var(--space-md);
}

@media (min-width: 768px) {
  .container {
    padding-left: var(--space-xl);
    padding-right: var(--space-xl);
  }
}

.section {
  padding-top: var(--space-3xl);
  padding-bottom: var(--space-3xl);
}

@media (min-width: 768px) {
  .section {
    padding-top: 4rem;
    padding-bottom: 4rem;
  }
}

.section--light {
  background-color: var(--color-gray-50);
}

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

.section--alt h2,
.section--alt h3,
.section--alt h4,
.section--alt h5,
.section--alt h6 {
  color: var(--color-white);
}

.section--alt p,
.section--alt li {
  color: var(--color-gray-100);
}

.section--alt a {
  color: var(--color-teal-light);
}

.section--alt a:hover {
  color: var(--color-teal);
}

/* Grid */
.grid {
  display: grid;
  gap: var(--space-lg);
}

@media (min-width: 768px) {
  .grid { gap: var(--space-xl); }
}

.grid-2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }

/* Flex layouts */
.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }

.items-center {
  align-items: center;
}

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

.justify-between {
  justify-content: space-between;
}

/* ============================================================================
   Header & Navigation
   ============================================================================ */

header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-gray-100);
  box-shadow: var(--shadow-sm);
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 4rem;
}

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

.logo img {
  height: 2rem;
  width: auto;
}

.nav-menu {
  display: none;
  list-style: none;
  flex-direction: row;
  gap: var(--space-xl);
}

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

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  padding: var(--space-md) 0;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-gray-700);
  transition: color var(--transition-fast);
}

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

.nav-link:focus {
  outline: 2px solid var(--color-teal);
  outline-offset: 4px;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-md);
  color: var(--color-navy);
  font-size: var(--text-xl);
}

@media (max-width: 767px) {
  .nav-toggle {
    display: block;
  }
}

.nav-mobile {
  display: none;
  position: absolute;
  top: 4rem;
  left: 0;
  right: 0;
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-gray-100);
  flex-direction: column;
  padding: var(--space-md);
  gap: var(--space-sm);
}

.nav-mobile.active {
  display: flex;
}

.nav-mobile .nav-link {
  padding: var(--space-md);
  border-radius: var(--border-radius);
}

.nav-mobile .nav-link:hover {
  background-color: var(--color-gray-50);
}

/* ============================================================================
   Buttons
   ============================================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.625rem 1.25rem;
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: var(--line-height-tight);
  text-decoration: none;
  border: none;
  border-radius: var(--border-radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn:focus {
  outline: 2px solid var(--color-teal);
  outline-offset: 2px;
}

.btn-primary {
  background-color: var(--color-teal);
  color: var(--color-white);
}

.btn-primary:hover {
  background-color: var(--color-teal-dark);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: var(--color-gray-200);
  color: var(--color-gray-700);
}

.btn-secondary:hover {
  background-color: var(--color-gray-300);
}

.btn-outline {
  background-color: transparent;
  border: 1.5px solid var(--color-navy);
  color: var(--color-navy);
}

.btn-outline:hover {
  background-color: var(--color-navy);
  color: var(--color-white);
}

.btn-link {
  background-color: transparent;
  color: var(--color-teal);
  padding: 0.5rem 0;
  font-weight: 500;
}

.btn-link:hover {
  color: var(--color-teal-dark);
  text-decoration: underline;
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: var(--text-xs);
}

.btn-lg {
  padding: 0.875rem 2rem;
  font-size: var(--text-base);
}

/* ============================================================================
   Cards
   ============================================================================ */

.card {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--border-radius-lg);
  padding: var(--space-lg);
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.card:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--color-teal);
}

.card-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  background-color: var(--color-gray-100);
  border-radius: var(--border-radius-full);
  color: var(--color-teal);
  font-size: var(--text-xl);
  margin-bottom: var(--space-md);
}

.card-title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-navy);
  margin-bottom: var(--space-md);
}

.card-body {
  font-size: var(--text-sm);
  line-height: var(--line-height-relaxed);
  color: var(--color-gray-600);
  flex-grow: 1;
}

.card-footer {
  margin-top: var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-gray-100);
}

/* ============================================================================
   Forms
   ============================================================================ */

.form-group {
  margin-bottom: var(--space-lg);
}

.form-group:last-child {
  margin-bottom: 0;
}

.form-label {
  display: block;
  font-weight: 500;
  margin-bottom: var(--space-sm);
  color: var(--color-gray-700);
  font-size: var(--text-sm);
}

.form-label.required::after {
  content: ' *';
  color: #dc2626;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.625rem 0.75rem;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  line-height: var(--line-height-normal);
  color: var(--color-gray-700);
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-300);
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-teal);
  box-shadow: 0 0 0 3px rgba(8, 145, 178, 0.1);
}

.form-textarea {
  resize: vertical;
  min-height: 8rem;
}

.form-input.error,
.form-select.error,
.form-textarea.error {
  border-color: #dc2626;
}

.form-input.error:focus,
.form-select.error:focus,
.form-textarea.error:focus {
  box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.1);
}

.form-error {
  display: block;
  margin-top: var(--space-xs);
  font-size: var(--text-xs);
  color: #dc2626;
  font-weight: 500;
}

.form-help {
  display: block;
  margin-top: var(--space-xs);
  font-size: var(--text-xs);
  color: var(--color-gray-500);
}

.form-check {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.form-check input[type="checkbox"],
.form-check input[type="radio"] {
  margin-top: 0.375rem;
  cursor: pointer;
  width: 1rem;
  height: 1rem;
  accent-color: var(--color-teal);
}

.form-check input:focus {
  outline: 2px solid var(--color-teal);
  outline-offset: 2px;
}

.form-check-label {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-gray-700);
  cursor: pointer;
}

/* ============================================================================
   Alerts & Messages
   ============================================================================ */

.alert {
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--border-radius-lg);
  margin-bottom: var(--space-lg);
}

.alert-success {
  background-color: #d1fae5;
  color: #065f46;
  border: 1px solid #a7f3d0;
}

.alert-error {
  background-color: #fee2e2;
  color: #7f1d1d;
  border: 1px solid #fca5a5;
}

.alert-warning {
  background-color: #fef3c7;
  color: #78350f;
  border: 1px solid #fcd34d;
}

.alert-info {
  background-color: #dbeafe;
  color: #0c2340;
  border: 1px solid #93c5fd;
}

/* ============================================================================
   Breadcrumb
   ============================================================================ */

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  list-style: none;
  font-size: var(--text-sm);
  color: var(--color-gray-600);
  margin-bottom: var(--space-lg);
}

.breadcrumb li {
  display: flex;
  align-items: center;
}

.breadcrumb a {
  color: var(--color-teal);
}

.breadcrumb a:hover {
  color: var(--color-teal-dark);
}

.breadcrumb li:not(:last-child)::after {
  content: '/';
  margin-left: var(--space-md);
  margin-right: var(--space-md);
  color: var(--color-gray-400);
}

.breadcrumb li:last-child {
  color: var(--color-gray-700);
}

/* ============================================================================
   Accordion / Disclosure
   ============================================================================ */

.disclosure {
  border: 1px solid var(--color-gray-200);
  border-radius: var(--border-radius-lg);
  margin-bottom: var(--space-md);
  overflow: hidden;
}

.disclosure-summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  padding: var(--space-lg);
  background-color: var(--color-gray-50);
  border: none;
  cursor: pointer;
  font-weight: 600;
  color: var(--color-navy);
  font-size: var(--text-base);
  transition: all var(--transition-fast);
}

.disclosure-summary:hover {
  background-color: var(--color-gray-100);
}

.disclosure-summary:focus {
  outline: 2px solid var(--color-teal);
  outline-offset: -2px;
}

.disclosure-summary::marker {
  color: var(--color-teal);
}

.disclosure-summary::before {
  content: '▶';
  display: inline-block;
  margin-right: var(--space-md);
  transition: transform var(--transition-fast);
  color: var(--color-teal);
  font-size: var(--text-sm);
}

details[open] .disclosure-summary::before {
  transform: rotate(90deg);
}

.disclosure-body {
  padding: var(--space-lg);
  background-color: var(--color-white);
  border-top: 1px solid var(--color-gray-200);
}

.disclosure-body p:last-child {
  margin-bottom: 0;
}

/* ============================================================================
   Hero Section
   ============================================================================ */

.hero {
  padding-top: var(--space-3xl);
  padding-bottom: var(--space-3xl);
  background-color: var(--color-white);
}

@media (min-width: 768px) {
  .hero {
    padding-top: 5rem;
    padding-bottom: 5rem;
  }
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  align-items: center;
}

@media (min-width: 768px) {
  .hero-content {
    grid-template-columns: 1fr 1fr;
  }
}

.hero-text h1 {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-lg);
  line-height: 1.2;
}

@media (min-width: 768px) {
  .hero-text h1 {
    font-size: var(--text-4xl);
  }
}

.hero-text p {
  font-size: var(--text-lg);
  line-height: var(--line-height-relaxed);
  color: var(--color-gray-600);
  margin-bottom: var(--space-xl);
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.hero-image {
  width: 100%;
  height: auto;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
}

/* ============================================================================
   Feature Grids & Stats
   ============================================================================ */

.feature-card {
  text-align: center;
}

.feature-card .card-icon {
  margin-left: auto;
  margin-right: auto;
}

.feature-card .card-title {
  text-align: center;
}

.feature-card .card-body {
  text-align: center;
}

.stat-box {
  text-align: center;
  padding: var(--space-xl);
}

.stat-value {
  display: block;
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--color-teal);
  line-height: 1;
  margin-bottom: var(--space-md);
}

.stat-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-gray-600);
}

/* ============================================================================
   Image Alignment
   ============================================================================ */

.image-wrapper {
  width: 100%;
  height: auto;
  overflow: hidden;
}

.image-wrapper img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--border-radius-lg);
}

/* ============================================================================
   Footer
   ============================================================================ */

footer {
  background-color: var(--color-navy);
  color: var(--color-gray-300);
  padding-top: var(--space-3xl);
  padding-bottom: var(--space-2xl);
}

footer h3 {
  color: var(--color-white);
  font-size: var(--text-lg);
  margin-bottom: var(--space-lg);
}

footer ul {
  list-style: none;
}

footer ul li {
  margin-bottom: var(--space-md);
}

footer a {
  color: var(--color-teal-light);
  transition: color var(--transition-fast);
}

footer a:hover {
  color: var(--color-teal);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-xl);
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-2xl);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-copyright {
  text-align: center;
  font-size: var(--text-sm);
  color: var(--color-gray-400);
}

.scroll-to-top {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  width: 3rem;
  height: 3rem;
  background-color: var(--color-teal);
  color: var(--color-white);
  border: none;
  border-radius: var(--border-radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  font-size: var(--text-lg);
  z-index: 99;
}

.scroll-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.scroll-to-top:hover {
  background-color: var(--color-teal-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.scroll-to-top:focus {
  outline: 2px solid var(--color-white);
  outline-offset: 2px;
}

/* ============================================================================
   Utility Classes
   ============================================================================ */

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

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

.text-sm {
  font-size: var(--text-sm);
}

.text-lg {
  font-size: var(--text-lg);
}

.text-muted {
  color: var(--color-gray-500);
}

.text-primary {
  color: var(--color-navy);
}

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

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mt-2xl { margin-top: var(--space-2xl); }

.pt-lg { padding-top: var(--space-lg); }
.pb-lg { padding-bottom: var(--space-lg); }
.py-lg { padding-top: var(--space-lg); padding-bottom: var(--space-lg); }

.w-full {
  width: 100%;
}

.max-w-2xl {
  max-width: 42rem;
}

.mx-auto {
  margin-left: auto;
  margin-right: auto;
}

.hidden {
  display: none;
}

.rounded {
  border-radius: var(--border-radius-lg);
}

.border {
  border: 1px solid var(--color-gray-200);
}

.border-t {
  border-top: 1px solid var(--color-gray-200);
}

.border-b {
  border-bottom: 1px solid var(--color-gray-200);
}

/* ============================================================================
   Responsive Utilities
   ============================================================================ */

@media (max-width: 767px) {
  .hide-mobile {
    display: none;
  }
}

@media (min-width: 768px) {
  .show-mobile {
    display: none;
  }
}

/* ============================================================================
   Text & Color Utilities
   ============================================================================ */

.text-muted {
  color: var(--color-gray-600);
}

.text-sm {
  font-size: var(--text-sm);
}

.text-lg {
  font-size: var(--text-lg);
}

.text-xs {
  font-size: var(--text-xs);
}

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

.ms-1 {
  margin-left: var(--space-sm);
}

.me-md {
  margin-right: var(--space-md);
}

.mb-md {
  margin-bottom: var(--space-md);
}

.mb-lg {
  margin-bottom: var(--space-lg);
}

.mb-2xl {
  margin-bottom: var(--space-2xl);
}

.mt-lg {
  margin-top: var(--space-lg);
}

.pt-lg {
  padding-top: var(--space-lg);
}

.pb-lg {
  padding-bottom: var(--space-lg);
}

.w-full {
  width: 100%;
}

.vstack {
  display: flex;
  flex-direction: column;
}

.gap-md {
  gap: var(--space-md);
}