/* ========================================
   KUURA Landing Page Styles
   ======================================== */

/* ========================================
   CSS Variables & Reset
   ======================================== */
:root {
  --color-main: #1C3A2F;
  --color-sub: #E8E0D5;
  --color-accent: #A8C5A0;
  --color-text: #2C2C2C;
  --color-white: #FFFFFF;
  --color-dark-alt: #2A4A3A;

  --font-heading: 'Cormorant Garamond', serif;
  --font-body: 'Noto Sans JP', sans-serif;

  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;

  --transition-base: 0.3s ease;
  --transition-smooth: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul {
  list-style: none;
}

/* Focus Visible Styles for Accessibility */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
}

/* ========================================
   Layout
   ======================================== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--spacing-md);
  }
}

/* ========================================
   1. Navigation
   ======================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--spacing-sm) 0;
  transition: background-color var(--transition-smooth),
              backdrop-filter var(--transition-smooth);
}

.header.scrolled {
  background-color: rgba(28, 58, 47, 0.9);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

@media (min-width: 768px) {
  .nav {
    padding: 0 var(--spacing-md);
  }
}

.logo {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--color-white);
  letter-spacing: 0.1em;
}

.nav-links {
  display: none;
  align-items: center;
  gap: var(--spacing-md);
}

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

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-white);
  opacity: 0.9;
  transition: opacity var(--transition-base);
}

.nav-links a:hover {
  opacity: 1;
}

.nav-cta {
  background-color: var(--color-accent);
  color: var(--color-main) !important;
  padding: 0.5rem 1.25rem;
  border-radius: 4px;
  opacity: 1 !important;
}

.nav-cta:hover {
  background-color: #98b590;
}

/* Mobile Menu Button */
.mobile-menu-btn {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

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

.mobile-menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-white);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.mobile-menu-btn.active span:nth-child(1) {
  transform: rotate(45deg) translateY(7px);
}

.mobile-menu-btn.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
  transform: rotate(-45deg) translateY(-7px);
}

/* Mobile Navigation Overlay */
.mobile-nav-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(28, 58, 47, 0.98);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-smooth), visibility var(--transition-smooth);
}

.mobile-nav-overlay.active {
  opacity: 1;
  visibility: visible;
}

.mobile-nav {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
}

.mobile-nav a {
  font-size: 1.5rem;
  color: var(--color-white);
  font-weight: 500;
}

/* ========================================
   2. Hero Section
   ======================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, var(--color-main) 0%, #0F2419 50%, var(--color-main) 100%);
  z-index: -2;
}

.hero-bg::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(ellipse at 30% 20%, rgba(168, 197, 160, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 70% 80%, rgba(168, 197, 160, 0.1) 0%, transparent 50%);
  animation: steamAnimation 8s ease-in-out infinite;
}

@keyframes steamAnimation {
  0%, 100% {
    opacity: 0.6;
    transform: translateY(0);
  }
  50% {
    opacity: 1;
    transform: translateY(-20px);
  }
}

.hero-bg::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 50% 120%, rgba(168, 197, 160, 0.2) 0%, transparent 60%);
  animation: steamAnimation2 12s ease-in-out infinite;
}

@keyframes steamAnimation2 {
  0%, 100% {
    opacity: 0.4;
    transform: scale(1);
  }
  50% {
    opacity: 0.8;
    transform: scale(1.1);
  }
}

.hero-content {
  text-align: center;
  padding: var(--spacing-md);
  z-index: 1;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 600;
  color: var(--color-white);
  letter-spacing: 0.15em;
  margin-bottom: var(--spacing-sm);
  opacity: 0;
  transform: translateY(30px);
}

.hero-subtitle {
  font-size: clamp(1rem, 3vw, 1.25rem);
  color: var(--color-sub);
  margin-bottom: var(--spacing-lg);
  opacity: 0;
  transform: translateY(30px);
}

/* CTA Button */
.cta-button {
  display: inline-block;
  background-color: var(--color-accent);
  color: var(--color-main);
  font-size: 1rem;
  font-weight: 700;
  padding: 1rem 2.5rem;
  border-radius: 4px;
  border: none;
  cursor: pointer;
  transition: background-color var(--transition-base), transform var(--transition-base);
  min-height: 48px;
  opacity: 0;
  transform: translateY(30px);
}

.cta-button:hover {
  background-color: #98b590;
  transform: translateY(-2px);
}

/* Scroll Down Arrow */
.scroll-down {
  position: absolute;
  bottom: var(--spacing-md);
  left: 50%;
  transform: translateX(-50%);
}

.scroll-arrow {
  display: block;
  width: 24px;
  height: 24px;
  border-right: 2px solid var(--color-white);
  border-bottom: 2px solid var(--color-white);
  transform: rotate(45deg);
  animation: scrollBounce 2s ease-in-out infinite;
  opacity: 0.7;
}

@keyframes scrollBounce {
  0%, 100% {
    transform: rotate(45deg) translateY(0);
    opacity: 0.7;
  }
  50% {
    transform: rotate(45deg) translateY(10px);
    opacity: 1;
  }
}

/* ========================================
   3. Concept Section
   ======================================== */
.concept {
  padding: var(--spacing-xl) 0;
  background-color: var(--color-white);
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 600;
  text-align: center;
  color: var(--color-main);
  margin-bottom: var(--spacing-xs);
}

.section-title.light {
  color: var(--color-white);
}

.section-subtitle {
  text-align: center;
  color: var(--color-text);
  opacity: 0.7;
  margin-bottom: var(--spacing-lg);
  font-size: 0.9375rem;
}

.concept-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
}

@media (min-width: 768px) {
  .concept-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
  }
}

.concept-card {
  text-align: center;
  padding: var(--spacing-md);
  opacity: 0;
  transform: translateY(40px);
}

.concept-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--spacing-sm);
  color: var(--color-main);
}

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

.concept-card h3 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-main);
  margin-bottom: var(--spacing-xs);
}

.concept-card p {
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--color-text);
  opacity: 0.8;
}

/* ========================================
   4. Ingredients Section
   ======================================== */
.ingredients {
  padding: var(--spacing-xl) 0;
  background-color: var(--color-sub);
}

.ingredients-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-sm);
}

@media (min-width: 768px) {
  .ingredients-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
  }
}

.ingredient-card {
  background-color: var(--color-white);
  padding: var(--spacing-md);
  border-radius: 8px;
  text-align: center;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
  opacity: 0;
  transform: translateY(30px);
}

.ingredient-number {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 6vw, 3.5rem);
  font-weight: 700;
  color: var(--color-main);
  line-height: 1;
}

.ingredient-unit {
  font-size: 1rem;
  color: var(--color-main);
  opacity: 0.7;
}

.ingredient-card h3 {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-main);
  margin: var(--spacing-sm) 0 var(--spacing-xs);
}

.ingredient-card p {
  font-size: 0.8125rem;
  color: var(--color-text);
  opacity: 0.7;
}

/* ========================================
   5. Product Section
   ======================================== */
.product {
  padding: var(--spacing-xl) 0;
  background-color: var(--color-white);
}

.product-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  align-items: center;
}

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

.product-image {
  display: flex;
  justify-content: center;
}

.product-image img {
  width: 100%;
  max-width: 450px;
  height: auto;
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(28, 58, 47, 0.3);
  transition: transform var(--transition-smooth);
}

.product-image img:hover {
  transform: scale(1.02);
}

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

@media (min-width: 768px) {
  .product-info {
    text-align: left;
  }
}

.product-name {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 600;
  color: var(--color-main);
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-xs);
}

.product-tagline {
  font-size: 1rem;
  color: var(--color-text);
  opacity: 0.7;
  margin-bottom: var(--spacing-md);
}

.product-details {
  margin-bottom: var(--spacing-md);
}

.product-spec {
  font-size: 0.9375rem;
  color: var(--color-text);
}

.product-price {
  font-size: 1.25rem;
  color: var(--color-main);
}

.product-price strong {
  font-size: 1.5rem;
  font-weight: 700;
}

.subscription-info {
  background-color: var(--color-sub);
  padding: var(--spacing-md);
  border-radius: 8px;
  margin-bottom: var(--spacing-md);
}

.subscription-title {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
  opacity: 0.7;
  margin-bottom: var(--spacing-xs);
}

.subscription-offer {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-main);
}

.subscription-offer .highlight {
  font-size: 1.5rem;
  color: #C44D4D;
}

.subscription-regular {
  font-size: 0.9375rem;
  color: var(--color-text);
}

.product-badges {
  display: flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
  justify-content: center;
}

@media (min-width: 768px) {
  .product-badges {
    justify-content: flex-start;
  }
}

.badge {
  display: inline-block;
  background-color: var(--color-main);
  color: var(--color-white);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.375rem 0.75rem;
  border-radius: 4px;
}

/* ========================================
   6. Reviews Section
   ======================================== */
.reviews {
  padding: var(--spacing-xl) 0;
  background-color: var(--color-sub);
  overflow: hidden;
}

.reviews-grid {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.review-card {
  background-color: var(--color-white);
  padding: var(--spacing-md);
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
  max-width: 600px;
  opacity: 0;
}

.review-left {
  align-self: flex-start;
  transform: translateX(-100px);
}

.review-right {
  align-self: flex-end;
  transform: translateX(100px);
}

@media (max-width: 767px) {
  .review-left,
  .review-right {
    align-self: stretch;
    max-width: 100%;
  }
}

.review-text {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
}

.review-author {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.author-name {
  font-weight: 700;
  color: var(--color-main);
}

.author-info {
  font-size: 0.875rem;
  color: var(--color-text);
  opacity: 0.6;
}

/* ========================================
   7. Purchase Section
   ======================================== */
.purchase {
  padding: var(--spacing-xl) 0;
  background-color: var(--color-main);
}

.purchase-subtitle {
  text-align: center;
  color: var(--color-sub);
  margin-bottom: var(--spacing-lg);
  font-size: 1rem;
}

.purchase-plans {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
  max-width: 800px;
  margin: 0 auto var(--spacing-lg);
}

@media (min-width: 768px) {
  .purchase-plans {
    grid-template-columns: repeat(2, 1fr);
  }
}

.plan-card {
  background-color: var(--color-white);
  padding: var(--spacing-md);
  border-radius: 12px;
  text-align: center;
  position: relative;
}

.plan-main {
  border: 3px solid var(--color-accent);
}

.plan-label {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-accent);
  color: var(--color-main);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 1rem;
  border-radius: 20px;
}

.plan-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-main);
  margin-bottom: var(--spacing-sm);
}

.plan-price {
  font-size: 1rem;
  color: var(--color-text);
  margin-bottom: var(--spacing-xs);
}

.plan-price .price-highlight {
  font-size: 2rem;
  font-weight: 700;
  color: #C44D4D;
}

.plan-price .price-note {
  font-size: 0.875rem;
  color: #C44D4D;
}

.plan-detail {
  font-size: 0.875rem;
  color: var(--color-text);
  opacity: 0.7;
  margin-bottom: var(--spacing-md);
}

.cta-primary {
  width: 100%;
  background-color: var(--color-main);
  color: var(--color-white);
  opacity: 1;
  transform: none;
}

.cta-primary:hover {
  background-color: var(--color-dark-alt);
}

.cta-secondary {
  width: 100%;
  background-color: transparent;
  color: var(--color-main);
  border: 2px solid var(--color-main);
  opacity: 1;
  transform: none;
}

.cta-secondary:hover {
  background-color: var(--color-main);
  color: var(--color-white);
}

.trust-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-md);
}

.trust-badge {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--color-sub);
  font-size: 0.875rem;
}

.trust-badge svg {
  width: 24px;
  height: 24px;
  stroke: var(--color-accent);
}

/* ========================================
   8. Footer
   ======================================== */
.footer {
  padding: var(--spacing-lg) 0;
  background-color: #0F2419;
  text-align: center;
}

.footer-logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-white);
  letter-spacing: 0.1em;
  display: inline-block;
  margin-bottom: var(--spacing-md);
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.footer-nav a {
  font-size: 0.8125rem;
  color: var(--color-sub);
  opacity: 0.7;
  transition: opacity var(--transition-base);
}

.footer-nav a:hover {
  opacity: 1;
}

.copyright {
  font-size: 0.75rem;
  color: var(--color-sub);
  opacity: 0.5;
}

/* ========================================
   Utility Classes
   ======================================== */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}