/* Keiro Website - Design System */
/* Matches Flutter app theme exactly */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+JP:wght@200;300;400&display=swap');

/* CSS Variables - Design Tokens */
:root {
  /* Colors */
  --color-background: #000000;
  --color-text: #FFFFFF;
  --color-text-secondary: rgba(255, 255, 255, 0.6);
  --color-border: rgba(255, 255, 255, 0.3);
  --color-surface: rgba(255, 255, 255, 0.05);

  /* Typography */
  --font-family: 'Noto Serif JP', serif;
  --font-weight-light: 200;
  --font-weight-normal: 300;
  --font-weight-medium: 400;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;

  /* Max width */
  --max-width: 1200px;
  --max-width-narrow: 600px;
}

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

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

body {
  font-family: var(--font-family);
  font-weight: var(--font-weight-normal);
  background-color: var(--color-background);
  color: var(--color-text);
  line-height: 1.7;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-light);
  line-height: 1.2;
  margin-bottom: var(--space-md);
}

h1 {
  font-size: 3.5rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.75rem;
  margin-top: var(--space-2xl);
}

h3 {
  font-size: 1.25rem;
  margin-top: var(--space-xl);
}

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

a {
  color: var(--color-text);
  text-decoration: none;
  transition: opacity 0.2s ease;
}

a:hover {
  opacity: 0.8;
}

ul, ol {
  margin-bottom: var(--space-md);
  padding-left: var(--space-lg);
  color: var(--color-text-secondary);
}

li {
  margin-bottom: var(--space-sm);
}

/* Layout */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-md);
}

.container-narrow {
  max-width: var(--max-width-narrow);
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  padding: var(--space-lg) var(--space-xl);
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 100;
}

.header-content {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.header-nav a {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  letter-spacing: 0.02em;
}

.header-nav a:hover {
  color: var(--color-text);
}

.header-nav .btn {
  color: var(--color-background);
}

.header-nav .btn:hover {
  color: var(--color-text);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
}

.logo img {
  height: 40px;
  width: auto;
}

.logo-text {
  font-size: 1.5rem;
  font-weight: var(--font-weight-light);
  color: var(--color-text);
  letter-spacing: 0.05em;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  border: 1px solid var(--color-text);
  border-radius: 100px;
  background: transparent;
  color: var(--color-text);
  font-family: var(--font-family);
  font-size: 0.9rem;
  font-weight: var(--font-weight-normal);
  letter-spacing: 0.02em;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn:hover {
  background: var(--color-text);
  color: var(--color-background);
  opacity: 1;
}

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

.btn-primary:hover {
  background: transparent;
  color: var(--color-text);
}

.btn-sm {
  padding: var(--space-sm) var(--space-lg);
  font-size: 0.8rem;
}

.btn-lg {
  padding: var(--space-md) var(--space-2xl);
  font-size: 1rem;
}

.btn-icon {
  width: 20px;
  height: 20px;
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: var(--space-4xl) var(--space-xl);
  padding-top: calc(var(--space-4xl) + 80px);
}

.hero-content {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.hero-text {
  max-width: 560px;
}

.hero h1 {
  margin-bottom: var(--space-lg);
  line-height: 1.1;
}

.hero-description {
  font-size: 1.125rem;
  line-height: 1.8;
  margin-bottom: var(--space-xl);
}

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

.hero-subtext {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin: 0;
  padding-top: 15px;
}

/* Phone Mockup */
.hero-phone {
  display: flex;
  justify-content: center;
  align-items: center;
}

.phone-frame {
  position: relative;
  width: 280px;
  background: #1a1a1a;
  border-radius: 40px;
  padding: 12px;
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.1),
    0 25px 50px -12px rgba(0, 0, 0, 0.5),
    0 0 100px rgba(255, 255, 255, 0.05);
}

.phone-notch {
  position: absolute;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  width: 100px;
  height: 28px;
  background: #000;
  border-radius: 20px;
  z-index: 10;
}

.phone-screen {
  width: 100%;
  height: auto;
  border-radius: 28px;
  display: block;
}

/* Features Section */
.features {
  padding: var(--space-4xl) var(--space-xl);
  border-top: 1px solid var(--color-border);
}

.features-content {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xl);
}

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

.feature-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--space-md);
  color: var(--color-text);
  opacity: 0.8;
}

.feature-icon svg {
  width: 100%;
  height: 100%;
}

.feature h3 {
  font-size: 1.1rem;
  margin-top: 0;
  margin-bottom: var(--space-sm);
  font-weight: var(--font-weight-normal);
}

.feature p {
  font-size: 0.9rem;
  margin: 0;
  line-height: 1.6;
}

/* Footer */
.footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-xl) var(--space-md);
  text-align: center;
}

.footer-content {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  margin-bottom: var(--space-md);
}

.footer-links a {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  letter-spacing: 0.02em;
}

.footer-copyright {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}

/* Legal Pages */
.legal-header {
  text-align: center;
  padding: var(--space-2xl) 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-xl);
}

.legal-header h1 {
  margin-bottom: var(--space-sm);
  font-size: 2.5rem;
}

.legal-date {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.legal-content {
  padding-bottom: var(--space-3xl);
}

.legal-content h2 {
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--space-sm);
  font-size: 1.5rem;
}

.legal-content h3 {
  color: var(--color-text);
}

.legal-content a {
  border-bottom: 1px solid var(--color-border);
}

.legal-content a:hover {
  border-color: var(--color-text);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  letter-spacing: 0.02em;
}

/* Responsive */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--space-2xl);
  }

  .hero-text {
    max-width: 100%;
    order: 1;
  }

  .hero-phone {
    order: 2;
  }

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

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

@media (max-width: 768px) {
  :root {
    --space-xl: 24px;
    --space-2xl: 32px;
    --space-3xl: 48px;
    --space-4xl: 64px;
  }

  h1 {
    font-size: 2.5rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .header {
    padding: var(--space-md) var(--space-md);
  }

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

  .header-nav a:not(.btn):not(.lang-link) {
    display: none;
  }

  .hero {
    min-height: auto;
    padding: var(--space-3xl) var(--space-md);
    padding-top: calc(var(--space-3xl) + 80px);
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .hero-buttons .btn {
    width: 100%;
    max-width: 280px;
  }

  .phone-frame {
    width: 240px;
  }

  .features {
    padding: var(--space-3xl) var(--space-md);
  }

  .features-content {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
  }

  .feature {
    padding: var(--space-md);
  }

  .footer-links {
    flex-direction: column;
    gap: var(--space-md);
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 2rem;
  }

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

  .phone-frame {
    width: 200px;
  }
}

/* Pricing Page */
.pricing-page {
  min-height: 100vh;
  padding: var(--space-4xl) var(--space-xl);
  padding-top: calc(var(--space-4xl) + 80px);
}

.pricing-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.pricing-header h1 {
  font-size: 3rem;
  margin-bottom: var(--space-md);
}

.pricing-header p {
  font-size: 1.25rem;
}

.pricing-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
  max-width: 800px;
  margin: 0 auto var(--space-2xl);
}

.pricing-card {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
}

.pricing-card-featured {
  border-color: var(--color-text);
  background: rgba(255, 255, 255, 0.08);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-text);
  color: var(--color-background);
  padding: var(--space-xs) var(--space-md);
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: var(--font-weight-medium);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.pricing-card-header {
  text-align: center;
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-lg);
}

.pricing-card-header h2 {
  font-size: 1.5rem;
  margin: 0 0 var(--space-md) 0;
}

.pricing-price {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: var(--space-xs);
}

.price-amount {
  font-size: 3rem;
  font-weight: var(--font-weight-light);
  color: var(--color-text);
  line-height: 1;
}

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

.pricing-billing {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin: var(--space-sm) 0 0 0;
}

.pricing-features {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-xl) 0;
  flex: 1;
}

.pricing-features li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
  color: var(--color-text-secondary);
  font-size: 0.95rem;
}

.pricing-features li strong {
  color: var(--color-text);
  font-weight: var(--font-weight-medium);
}

.check-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: var(--color-text);
  opacity: 0.6;
  margin-top: 2px;
}

.pricing-btn {
  width: 100%;
}

.pricing-monthly {
  text-align: center;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  margin: var(--space-md) 0 0 0;
}

.pricing-note {
  text-align: center;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  max-width: 500px;
  margin: 0 auto;
}

@media (max-width: 768px) {
  .pricing-header h1 {
    font-size: 2.5rem;
  }

  .pricing-cards {
    grid-template-columns: 1fr;
    max-width: 400px;
  }

  .pricing-card-featured {
    order: -1;
  }
}

/* Utility Classes */
.text-center {
  text-align: center;
}

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

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

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

/* Beta Signup Form - Modern Design */
.beta-signup {
  margin-bottom: var(--space-lg);
}

/* Honeypot - hidden from humans */
.honeypot {
  position: absolute;
  left: -9999px;
  opacity: 0;
  height: 0;
  width: 0;
  pointer-events: none;
}

.beta-label {
  font-size: 0.875rem;
  color: var(--color-text);
  margin-bottom: var(--space-md);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.beta-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.form-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

/* Unified input group - input + button in one pill */
.form-input-group {
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 100px;
  padding: 6px 6px 6px 20px;
  transition: all 0.3s ease;
}

.form-input-group:focus-within {
  border-color: rgba(255, 255, 255, 0.4);
  background: rgba(255, 255, 255, 0.08);
  box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.05);
}

.input-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: var(--color-text-secondary);
  margin-right: var(--space-sm);
}

.form-input {
  flex: 1;
  min-width: 0;
  padding: var(--space-md) var(--space-sm);
  background: transparent;
  border: none;
  color: var(--color-text);
  font-family: var(--font-family);
  font-size: 1rem;
  outline: none;
}

.form-input::placeholder {
  color: var(--color-text-secondary);
}

/* Submit button inside input group */
.form-submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 12px 24px;
  background: var(--color-text);
  color: var(--color-background);
  border: none;
  border-radius: 100px;
  font-family: var(--font-family);
  font-size: 0.9rem;
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.form-submit:hover {
  background: rgba(255, 255, 255, 0.9);
  transform: translateX(2px);
}

.form-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.arrow-icon {
  width: 16px;
  height: 16px;
  transition: transform 0.2s ease;
}

.form-submit:hover .arrow-icon {
  transform: translateX(3px);
}

/* Platform pills - modern toggle style */
.form-platforms {
  display: flex;
  gap: var(--space-sm);
  justify-content: flex-start;
  margin-top: var(--space-xs);
}

.platform-pill {
  cursor: pointer;
}

.platform-pill input[type="checkbox"] {
  display: none;
}

.pill-content {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 100px;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  transition: all 0.2s ease;
}

.pill-content svg {
  opacity: 0.6;
  transition: opacity 0.2s ease;
}

.platform-pill:hover .pill-content {
  border-color: rgba(255, 255, 255, 0.3);
  color: var(--color-text);
}

.platform-pill:hover .pill-content svg {
  opacity: 0.8;
}

.platform-pill input[type="checkbox"]:checked + .pill-content {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.4);
  color: var(--color-text);
}

.platform-pill input[type="checkbox"]:checked + .pill-content svg {
  opacity: 1;
}

/* Platform validation error state */
.form-platforms.platforms-error .pill-content {
  border-color: rgba(239, 68, 68, 0.6);
  animation: shake 0.4s ease;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-4px); }
  40%, 80% { transform: translateX(4px); }
}

/* Form message */
.form-message {
  display: none;
  padding: var(--space-md);
  border-radius: 12px;
  font-size: 0.9rem;
  margin-top: var(--space-sm);
}

.form-message.success {
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.3);
  color: #22c55e;
}

.form-message.error {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #ef4444;
}

/* Loading spinner */
.spinner {
  animation: spin 1s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.btn-loading {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Responsive adjustments for beta form */
@media (max-width: 768px) {
  .form-input-group {
    padding: 5px 5px 5px 16px;
  }

  .form-submit {
    padding: 10px 18px;
    font-size: 0.85rem;
  }

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

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

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

@media (max-width: 480px) {
  .form-input-group {
    flex-direction: column;
    padding: var(--space-md);
    border-radius: 16px;
    gap: var(--space-md);
  }

  .input-icon {
    display: none;
  }

  .form-input {
    width: 100%;
    text-align: center;
    padding: var(--space-sm);
  }

  .form-submit {
    width: 100%;
    justify-content: center;
  }

  .form-platforms {
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
  }

  .pill-content {
    min-width: 140px;
    justify-content: center;
  }
}

/* App Showcase Section - Minimalist Japanese Style */
.showcase {
  padding: var(--space-4xl) var(--space-xl);
}

.showcase-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto var(--space-4xl);
}

.showcase-header h2 {
  font-size: 2.5rem;
  font-weight: var(--font-weight-light);
  margin: 0 0 var(--space-md) 0;
  letter-spacing: -0.01em;
}

.showcase-header p {
  font-size: 1.1rem;
  line-height: 1.8;
}

.showcase-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-3xl) 0;
}

.showcase-item:nth-child(even) {
  direction: rtl;
}

.showcase-item:nth-child(even) > * {
  direction: ltr;
}

.showcase-item + .showcase-item {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.showcase-text {
  padding: var(--space-xl) 0;
}

.showcase-number {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: var(--space-md);
  display: block;
}

.showcase-text h3 {
  font-size: 1.75rem;
  font-weight: var(--font-weight-light);
  margin: 0 0 var(--space-md) 0;
  line-height: 1.3;
}

.showcase-text p {
  font-size: 1rem;
  line-height: 1.8;
  margin: 0;
}

.showcase-image {
  display: flex;
  justify-content: center;
  align-items: center;
}

.showcase-phone {
  position: relative;
  width: 240px;
  background: #111;
  border-radius: 36px;
  padding: 10px;
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.08),
    0 25px 50px -12px rgba(0, 0, 0, 0.6);
}

.showcase-phone-notch {
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 24px;
  background: #000;
  border-radius: 16px;
  z-index: 10;
}

.showcase-phone img {
  width: 100%;
  height: auto;
  border-radius: 26px;
  display: block;
}

/* Responsive for showcase */
@media (max-width: 1024px) {
  .showcase-item {
    gap: var(--space-2xl);
  }

  .showcase-phone {
    width: 200px;
  }
}

@media (max-width: 768px) {
  .showcase-header h2 {
    font-size: 2rem;
  }

  .showcase-item {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--space-xl);
    padding: var(--space-2xl) 0;
  }

  .showcase-item:nth-child(even) {
    direction: ltr;
  }

  .showcase-text {
    order: 2;
    padding: 0;
  }

  .showcase-image {
    order: 1;
  }

  .showcase-text h3 {
    font-size: 1.5rem;
  }

  .showcase-phone {
    width: 180px;
  }
}

@media (max-width: 480px) {
  .showcase {
    padding: var(--space-3xl) var(--space-md);
  }

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

  .showcase-header h2 {
    font-size: 1.75rem;
  }

  .showcase-phone {
    width: 160px;
    border-radius: 28px;
    padding: 8px;
  }

  .showcase-phone-notch {
    width: 60px;
    height: 18px;
    top: 8px;
  }

  .showcase-phone img {
    border-radius: 20px;
  }
}

/* Language Switcher */
.lang-switch {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: 1rem;
}

.lang-link {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.6);
  text-decoration: none;
  transition: color 0.2s ease;
}

.lang-link:hover,
.lang-link.active {
  color: #fff;
}

.lang-separator {
  color: rgba(255, 255, 255, 0.3);
}