/* ===== CSS Custom Properties ===== */
:root {
  /* Brand Colors */
  --color-primary: #F5CB5C;
  --color-background: #FFF9E6;
  --color-text-dark: #3D3D3D;
  --color-text-medium: #666666;
  --color-accent-gold: #FFD93D;
  --color-accent-green: #8BC34A;
  --color-white: #FFFFFF;
  --color-border: rgba(61, 61, 61, 0.1);

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans', 'Noto Sans SC', 'Noto Sans TC', 'Noto Sans JP', 'Noto Sans KR', sans-serif;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 4rem;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 50%;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
  --shadow-phone: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Container */
  --container-max-width: 1200px;
  --container-padding: 1.5rem;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-background);
  color: var(--color-text-dark);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

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

.section {
  padding: var(--spacing-xxl) 0;
}

/* ===== Hero Section ===== */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--spacing-xl) var(--container-padding);
  position: relative;
  gap: var(--spacing-xl);
}

.hero__content {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero__icon {
  width: 100px;
  height: 100px;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  margin-bottom: var(--spacing-md);
  animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

.hero__title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
  color: var(--color-text-dark);
}

.hero__tagline {
  font-size: 1.125rem;
  color: var(--color-text-medium);
  margin-bottom: var(--spacing-lg);
}

.hero__badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  justify-content: center;
}

.badge-link {
  display: inline-block;
  transition: transform var(--transition-fast);
}

.badge-link:hover {
  transform: scale(1.05);
}

.badge-link img {
  height: 44px;
  width: auto;
}

/* ===== Tilted Duo Screenshots ===== */
.tilted-duo {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-md);
  perspective: 1000px;
  padding: var(--spacing-lg) 0;
}

.tilted-duo__phone {
  width: 200px;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  filter: drop-shadow(0 25px 50px rgba(0, 0, 0, 0.15));
}

.tilted-duo__phone--left {
  transform: rotateY(15deg) rotateZ(-5deg);
}

.tilted-duo__phone--right {
  transform: rotateY(-15deg) rotateZ(5deg);
}

.tilted-duo__phone:hover {
  transform: rotateY(0) rotateZ(0) scale(1.05);
  filter: drop-shadow(0 35px 60px rgba(0, 0, 0, 0.2));
  z-index: 10;
}

.tilted-duo__phone img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
}

/* ===== Footer ===== */
.footer {
  background-color: var(--color-white);
  padding: var(--spacing-lg) 0;
  border-top: 1px solid var(--color-border);
}

.footer__content {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
}

.footer__links {
  display: flex;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
  align-items: center;
}

.footer__link {
  color: var(--color-text-medium);
  font-size: 0.875rem;
  line-height: 1;
  padding: var(--spacing-xs) 0;
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--color-text-dark);
}

.footer__copyright {
  font-size: 0.875rem;
  color: var(--color-text-medium);
}

/* ===== Language Selector ===== */
.language-selector {
  position: relative;
}

.language-selector__button {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background-color: var(--color-background);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: var(--color-text-medium);
  transition: background-color var(--transition-fast);
}

.language-selector__button:hover {
  background-color: var(--color-primary);
  color: var(--color-text-dark);
}

.language-selector__dropdown {
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  margin-bottom: var(--spacing-xs);
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-fast), visibility var(--transition-fast);
  z-index: 100;
  min-width: 150px;
}

.language-selector.open .language-selector__dropdown {
  opacity: 1;
  visibility: visible;
}

.language-selector__option {
  display: block;
  width: 100%;
  padding: var(--spacing-sm);
  text-align: left;
  font-size: 0.875rem;
  color: var(--color-text-dark);
  transition: background-color var(--transition-fast);
}

.language-selector__option:hover {
  background-color: var(--color-background);
}

.language-selector__option.active {
  background-color: var(--color-primary);
}

/* ===== Privacy Page ===== */
.privacy-page {
  padding: var(--spacing-xl) 0;
  min-height: 100vh;
}

.privacy-page .container {
  max-width: 800px;
}

.privacy-header {
  margin-bottom: var(--spacing-xl);
}

.privacy-header__back {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--color-text-medium);
  font-size: 0.9375rem;
  margin-bottom: var(--spacing-lg);
  transition: color var(--transition-fast);
}

.privacy-header__back:hover {
  color: var(--color-text-dark);
}

.privacy-header__back svg {
  width: 20px;
  height: 20px;
}

.privacy-header__title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.privacy-header__updated {
  color: var(--color-text-medium);
  font-size: 0.9375rem;
}

.privacy-content {
  background-color: var(--color-white);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.privacy-section {
  margin-bottom: var(--spacing-lg);
}

.privacy-section:last-child {
  margin-bottom: 0;
}

.privacy-section__title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-dark);
}

.privacy-section__content {
  color: var(--color-text-medium);
  line-height: 1.7;
}

.privacy-section__list {
  list-style: disc;
  margin-left: var(--spacing-lg);
  margin-top: var(--spacing-sm);
}

.privacy-section__list li {
  margin-bottom: var(--spacing-xs);
}

.privacy-section__email {
  color: var(--color-text-dark);
  font-weight: 500;
}

/* ===== Animations ===== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive Design ===== */

/* Tablet */
@media (max-width: 1024px) {
  :root {
    --container-padding: 1.25rem;
  }

  .hero__title {
    font-size: 2.25rem;
  }

  .hero__tagline {
    font-size: 1rem;
  }

  .tilted-duo__phone {
    width: 180px;
  }
}

/* Mobile */
@media (max-width: 768px) {
  :root {
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
  }

  .hero {
    min-height: auto;
    padding: var(--spacing-xxl) var(--container-padding);
    gap: var(--spacing-lg);
  }

  .hero__icon {
    width: 80px;
    height: 80px;
  }

  .hero__title {
    font-size: 2rem;
  }

  .hero__tagline {
    font-size: 0.9375rem;
    margin-bottom: var(--spacing-md);
  }

  .badge-link img {
    height: 40px;
  }

  .tilted-duo {
    gap: var(--spacing-sm);
  }

  .tilted-duo__phone {
    width: 150px;
  }

  .tilted-duo__phone--left {
    transform: rotateY(10deg) rotateZ(-3deg);
  }

  .tilted-duo__phone--right {
    transform: rotateY(-10deg) rotateZ(3deg);
  }

  .privacy-header__title {
    font-size: 1.75rem;
  }

  .privacy-content {
    padding: var(--spacing-lg);
  }

  .footer__content {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .footer__links {
    justify-content: center;
    gap: var(--spacing-md);
  }
}

/* Small Mobile */
@media (max-width: 480px) {
  .hero__badges {
    flex-direction: column;
    align-items: center;
  }

  .tilted-duo__phone {
    width: 130px;
  }
}