/* Apple UI Style Landing Page CSS */
/* Design System - CSS Custom Properties */
:root {
  /* Colors - Apple Inspired Palette */
  --color-primary: #007AFF;
  --color-primary-dark: #0056CC;
  --color-secondary: #FF9500;
  --color-background: #FFFFFF;
  --color-background-secondary: #F2F2F7;
  --color-surface: #FFFFFF;
  --color-text-primary: #1D1D1F;
  --color-text-secondary: #86868B;
  --color-text-tertiary: #C7C7CC;
  --color-border: #D2D2D7;
  --color-shadow: rgba(0, 0, 0, 0.1);
  --color-overlay: rgba(0, 0, 0, 0.4);
  
  /* Typography */
  --font-family-primary: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  --font-size-6xl: 3.75rem;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 6rem;
  --spacing-5xl: 8rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --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);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Transitions */
  --transition-fast: 0.15s ease-out;
  --transition-base: 0.3s ease-out;
  --transition-slow: 0.5s ease-out;
}

/* Reset and Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-background);
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: var(--font-size-5xl);
  font-weight: 700;
}

h2 {
  font-size: var(--font-size-4xl);
}

h3 {
  font-size: var(--font-size-3xl);
}

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

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

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

/* Layout Components */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.section {
  padding: var(--spacing-4xl) 0;
}

.section--hero {
  padding: var(--spacing-5xl) 0;
  background: linear-gradient(135deg, #F2F2F7 0%, #FFFFFF 100%);
}

.section--features {
  background-color: var(--color-background-secondary);
}

.section--tone-a {
  background: #f5f6f8;
}

.section--tone-b {
  background: #eceff3;
}

.section--tone-c {
  background: #1f2328;
  color: #f5f6f8;
}

.section--tone-c .features__title,
.section--tone-c .workflow__title,
.section--tone-c .pricing__title,
.section--tone-c .resources__title,
.section--tone-c .faq__title,
.section--tone-c .social-proof__title {
  color: #f5f6f8;
}

.section--tone-c .feature-card,
.section--tone-c .plan-card,
.section--tone-c .resource-card,
.section--tone-c .faq-card,
.section--tone-c .stat-card {
  background: rgba(255, 255, 255, 0.06);
  box-shadow: none;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.section--tone-c .feature-card__description,
.section--tone-c .workflow__step-description,
.section--tone-c .pricing__subtitle,
.section--tone-c .resources__subtitle,
.section--tone-c .faq__subtitle,
.section--tone-c .stat-card__label,
.section--tone-c .resource-card__desc,
.section--tone-c .faq-card__answer {
  color: rgba(245, 246, 248, 0.75);
}
/* Header Navigation */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) 0;
}

.nav__logo {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text-primary);
  text-decoration: none;
}

.nav__menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-xl);
}

.nav__link {
  color: var(--color-text-primary);
  font-weight: 500;
  transition: color var(--transition-fast);
}

.nav__link:hover {
  color: var(--color-primary);
}

.nav__cta {
  display: flex;
  gap: var(--spacing-md);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-full);
  font-family: inherit;
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

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

.btn--primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
  color: white;
}

.btn--secondary {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

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

.btn--large {
  padding: var(--spacing-md) var(--spacing-2xl);
  font-size: var(--font-size-base);
}

.btn--small {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: var(--font-size-xs);
}

/* Hero Section */
.hero {
  text-align: center;
  padding-top: 100px;
}

.hero__title {
  font-size: var(--font-size-6xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-lg);
  line-height: 1.1;
}

.hero__subtitle {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-2xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero__cta {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--spacing-4xl);
}

.hero__trial {
  max-width: 800px;
  margin: 0 auto;
}

/* Trial Upload Component */
.trial-upload {
  background: var(--color-surface);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  margin-top: var(--spacing-2xl);
}

.trial-upload__header {
  padding: var(--spacing-2xl) var(--spacing-2xl) var(--spacing-lg);
  text-align: center;
  background: linear-gradient(135deg, rgba(0, 122, 255, 0.05), rgba(255, 149, 0, 0.05));
}

.trial-upload__title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
}

.trial-upload__subtitle {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
}

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

.limit-badge {
  background: rgba(0, 122, 255, 0.1);
  color: var(--color-primary);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 600;
}

.limit-badge--premium {
  background: rgba(255, 149, 0, 0.1);
  color: var(--color-secondary);
}

/* Dropzone Styles */
.trial-upload__dropzone {
  padding: var(--spacing-2xl);
  min-height: 300px;
  position: relative;
}

.dropzone-content {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-3xl) var(--spacing-2xl);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-base);
  background: var(--color-background-secondary);
}

.dropzone-content:hover,
.dropzone-content.dragover {
  border-color: var(--color-primary);
  background: rgba(0, 122, 255, 0.05);
  transform: translateY(-2px);
}

.dropzone-icon {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
  transition: color var(--transition-base);
}

.dropzone-content:hover .dropzone-icon,
.dropzone-content.dragover .dropzone-icon {
  color: var(--color-primary);
}

.dropzone-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
}

.dropzone-subtitle {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
}

.dropzone-specs {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  flex-wrap: wrap;
}

.dropzone-specs span {
  background: var(--color-surface);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}

/* Upload Progress */
.upload-progress {
  text-align: center;
  padding: var(--spacing-3xl) var(--spacing-2xl);
}

.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--color-background-secondary);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: var(--spacing-lg);
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  border-radius: var(--radius-full);
  transition: width var(--transition-base);
  width: 0%;
}

.progress-text {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text-primary);
  margin: 0;
}

/* Translation Result */
.translation-result {
  padding: var(--spacing-2xl);
  background: rgba(34, 197, 94, 0.05);
  border-radius: var(--radius-xl);
  border: 1px solid rgba(34, 197, 94, 0.2);
}

.result-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.result-header h4 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: #059669;
  margin: 0;
}

.result-actions {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.result-stats {
  display: flex;
  gap: var(--spacing-xl);
  justify-content: center;
  flex-wrap: wrap;
}

.stat-item {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.stat-item strong {
  color: var(--color-text-primary);
  font-weight: 600;
}

/* Trial Footer */
.trial-upload__footer {
  padding: var(--spacing-lg) var(--spacing-2xl);
  background: var(--color-background-secondary);
  text-align: center;
}

.trial-note {
  margin: 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.trial-remaining {
  font-weight: 600;
  color: var(--color-text-primary);
}

.trial-upgrade {
  color: var(--color-primary);
  font-weight: 600;
  margin-left: var(--spacing-md);
  transition: color var(--transition-fast);
}

.trial-upgrade:hover {
  color: var(--color-primary-dark);
}

/* Trial Translate Module */
.hero__translate {
  max-width: 900px;
  margin: var(--spacing-3xl) auto 0;
}

.trial-translate {
  background: var(--color-surface);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(0, 0, 0, 0.04);
  overflow: hidden;
}

.trial-translate__header {
  padding: var(--spacing-2xl);
  text-align: center;
  background: linear-gradient(135deg, rgba(0, 122, 255, 0.08), rgba(34, 197, 94, 0.08));
}

.trial-translate__title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
}

.trial-translate__subtitle {
  color: var(--color-text-secondary);
  margin: 0;
}

.trial-translate__body {
  padding: var(--spacing-2xl);
  display: grid;
  gap: var(--spacing-xl);
}

.trial-translate__input {
  display: grid;
  gap: var(--spacing-md);
}

.trial-translate__label {
  font-weight: 600;
  color: var(--color-text-primary);
}

.trial-translate__textarea {
  width: 100%;
  min-height: 160px;
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: #fff;
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  resize: vertical;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.trial-translate__textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.15);
  outline: none;
}

.trial-translate__selectors {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--spacing-md);
}

.trial-select label {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xs);
}

.trial-select__control {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-background);
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.trial-select__control:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.12);
  outline: none;
}

.trial-translate__actions {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
  flex-wrap: wrap;
}

.trial-translate__status {
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
}

.trial-translate__status.is-success {
  color: #059669;
}

.trial-translate__status.is-error {
  color: #dc2626;
}

.trial-translate__status.is-muted {
  color: var(--color-text-tertiary);
}

.trial-translate__output {
  background: var(--color-background-secondary);
  border-radius: var(--radius-lg);
  border: 1px dashed var(--color-border);
  padding: var(--spacing-lg);
  min-height: 140px;
}

.trial-translate__output-title {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.trial-translate__result {
  white-space: pre-wrap;
  color: var(--color-text-primary);
}

.trial-translate__result.is-empty {
  color: var(--color-text-tertiary);
}

/* Features Section */
.features {
  text-align: center;
}

.features__title {
  margin-bottom: var(--spacing-3xl);
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-2xl);
  margin-top: var(--spacing-3xl);
}

.feature-card {
  background: var(--color-surface);
  padding: var(--spacing-2xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.feature-card__icon {
  width: 60px;
  height: 60px;
  margin: 0 auto var(--spacing-lg);
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-2xl);
  color: white;
}

.feature-card__title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

.feature-card__description {
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--spacing-lg);
}

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

.highlight-badge {
  background: rgba(0, 122, 255, 0.1);
  color: var(--color-primary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-md);
  font-size: var(--font-size-xs);
  font-weight: 600;
}

.highlight-badge--premium {
  background: rgba(255, 149, 0, 0.1);
  color: var(--color-secondary);
}

/* Workflow Section */
.workflow {
  text-align: center;
}

.workflow__title {
  margin-bottom: var(--spacing-3xl);
}

.workflow__steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-3xl);
  position: relative;
}

.workflow__step {
  position: relative;
  padding: var(--spacing-lg);
}

.workflow__step-number {
  width: 50px;
  height: 50px;
  background: var(--color-primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--font-size-lg);
  margin: 0 auto var(--spacing-lg);
}

.workflow__step-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

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

/* Social Proof */
.social-proof {
  text-align: center;
}

.social-proof__title {
  margin-bottom: var(--spacing-md);
}

.social-proof__subtitle {
  color: var(--color-text-secondary);
  max-width: 680px;
  margin: 0 auto var(--spacing-2xl);
}

.social-proof__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--spacing-xl);
}

.stat-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  text-align: left;
  box-shadow: var(--shadow-sm);
}

.stat-card__value {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
}

.stat-card__label {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

/* Pricing Section */
.pricing {
  text-align: center;
}

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

.pricing__subtitle {
  color: var(--color-text-secondary);
  max-width: 720px;
  margin: 0 auto var(--spacing-3xl);
}

.pricing__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--spacing-2xl);
}

.plan-card {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: var(--spacing-2xl);
  box-shadow: var(--shadow-md);
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.plan-card--free {
  border: 1px solid rgba(0, 122, 255, 0.2);
}

.plan-card__name {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-sm);
}

.plan-card__price {
  display: flex;
  align-items: baseline;
  gap: var(--spacing-xs);
  font-weight: 700;
}

.plan-card__currency {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.plan-card__amount {
  font-size: var(--font-size-2xl);
  color: var(--color-text-surface);
}

.plan-card__period {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.plan-card__meta {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

.plan-card__features {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: var(--spacing-sm);
}

.plan-card__feature {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-sm);
}

.plan-card__feature.is-off {
  color: var(--color-text-secondary);
}

.plan-card__check {
  width: 20px;
  text-align: center;
}

.plan-card__actions {
  margin-top: auto;
}

.btn--block {
  display: inline-flex;
  width: 100%;
  justify-content: center;
}

/* Resources Section */
.resources {
  text-align: center;
}

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

.resources__subtitle {
  color: var(--color-text-secondary);
  max-width: 720px;
  margin: 0 auto var(--spacing-3xl);
}

.resources__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--spacing-xl);
}

.resource-card {
  background: var(--color-surface);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  text-align: left;
}

.resource-card__title {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-sm);
}

.resource-card__desc {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

/* FAQ Section */
.faq {
  text-align: center;
}

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

.faq__subtitle {
  color: var(--color-text-secondary);
  max-width: 680px;
  margin: 0 auto var(--spacing-3xl);
}

.faq__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--spacing-xl);
}

.faq-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  text-align: left;
  box-shadow: var(--shadow-sm);
}

.faq-card__question {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.faq-card__answer {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  line-height: 1.6;
}

/* CTA Section */
.cta-section {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: white;
  text-align: center;
}

.cta-section__title {
  color: white;
  margin-bottom: var(--spacing-lg);
}

.cta-section__description {
  color: rgba(255, 255, 255, 0.8);
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-2xl);
}

.cta-section__actions {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  flex-wrap: wrap;
}

.cta-section .btn--secondary {
  background: white;
  color: var(--color-primary);
  border: none;
}

.cta-section .btn--secondary:hover {
  background: rgba(255, 255, 255, 0.9);
  color: var(--color-primary-dark);
}

/* Footer */
.footer {
  background-color: var(--color-text-primary);
  color: var(--color-text-tertiary);
  text-align: center;
  padding: var(--spacing-2xl) 0;
}

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

.footer__link {
  color: var(--color-text-tertiary);
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: white;
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav__menu {
    display: none;
  }
  
  .hero__title {
    font-size: var(--font-size-4xl);
  }
  
  .hero__subtitle {
    font-size: var(--font-size-lg);
  }
  
  .hero__cta {
    flex-direction: column;
    align-items: center;
  }
  
  .trial-upload__header {
    padding: var(--spacing-lg);
  }
  
  .trial-upload__dropzone {
    padding: var(--spacing-lg);
  }
  
  .dropzone-content {
    padding: var(--spacing-2xl) var(--spacing-lg);
  }
  
  .trial-upload__limits {
    flex-direction: column;
    align-items: center;
  }

  .trial-translate__selectors {
    grid-template-columns: 1fr;
  }

  .trial-translate__actions {
    flex-direction: column;
    align-items: stretch;
  }
  
  .result-header {
    flex-direction: column;
    text-align: center;
  }
  
  .result-stats {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .cta-section__actions {
    flex-direction: column;
    align-items: center;
  }
  
  .features__grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .workflow__steps {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .container {
    padding: 0 var(--spacing-md);
  }
  
  .section {
    padding: var(--spacing-2xl) 0;
  }
  
  .section--hero {
    padding: var(--spacing-3xl) 0;
  }
}

@media (max-width: 480px) {
  .hero__title {
    font-size: var(--font-size-3xl);
  }
  
  .btn {
    width: 100%;
    max-width: 280px;
  }
  
  .feature-card {
    padding: var(--spacing-lg);
  }
  
  .trial-upload__title {
    font-size: var(--font-size-xl);
  }
  
  .dropzone-specs {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.animate-fade-in-up {
  animation: fadeInUp 0.6s ease-out;
}

.animate-pulse {
  animation: pulse 2s infinite;
}

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

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

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

.mb-0 {
  margin-bottom: 0;
}

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

.hidden {
  display: none;
}

/* Dark mode support (optional) */
@media (prefers-color-scheme: dark) {
  :root {
    --color-background: #000000;
    --color-background-secondary: #1C1C1E;
    --color-surface: #2C2C2E;
    --color-text-primary: #FFFFFF;
    --color-text-secondary: #98989D;
    --color-text-tertiary: #636366;
    --color-border: #38383A;
  }
  
  .header {
    background: rgba(0, 0, 0, 0.8);
  }
  
  .section--hero {
    background: linear-gradient(135deg, #1C1C1E 0%, #000000 100%);
  }
  
  .trial-upload__header {
    background: linear-gradient(135deg, rgba(0, 122, 255, 0.1), rgba(255, 149, 0, 0.1));
  }
  
  .dropzone-content {
    background: var(--color-background-secondary);
    border-color: var(--color-border);
  }
  
  .translation-result {
    background: rgba(34, 197, 94, 0.1);
    border-color: rgba(34, 197, 94, 0.3);
  }
}

/* 预览模态框样式 */
.preview-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.preview-modal__overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.preview-modal__content {
    position: relative;
    background: var(--color-background);
    border-radius: 16px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    max-width: 800px;
    width: 90%;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.preview-modal__header {
    padding: 24px 24px 16px;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.preview-modal__header h3 {
    margin: 0;
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text-primary);
}

.preview-modal__close {
    background: none;
    border: none;
    font-size: 24px;
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.preview-modal__close:hover {
    background: var(--color-background-secondary);
    color: var(--color-text-primary);
}

.preview-modal__info {
    padding: 16px 24px;
    background: var(--color-background-secondary);
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}

.preview-modal__info span {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.preview-modal__body {
    flex: 1;
    overflow-y: auto;
    padding: 16px 24px;
}

.preview-item {
    display: flex;
    gap: 16px;
    padding: 16px 0;
    border-bottom: 1px solid var(--color-border);
}

.preview-item:last-child {
    border-bottom: none;
}

.preview-item__index {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    background: var(--color-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.preview-item__content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.preview-item__source,
.preview-item__target {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.preview-item__source label,
.preview-item__target label {
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.preview-text {
    padding: 12px;
    background: var(--color-background-secondary);
    border-radius: 8px;
    font-size: var(--font-size-sm);
    line-height: 1.5;
    color: var(--color-text-primary);
    word-break: break-word;
}

.preview-empty {
    text-align: center;
    padding: 48px 24px;
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
}

.preview-modal__footer {
    padding: 16px 24px;
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: flex-end;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .preview-modal__content {
        width: 95%;
        max-height: 90vh;
    }
    
    .preview-modal__header,
    .preview-modal__info,
    .preview-modal__body,
    .preview-modal__footer {
        padding-left: 16px;
        padding-right: 16px;
    }
    
    .preview-modal__info {
        flex-direction: column;
        gap: 8px;
    }
    
    .preview-item {
        flex-direction: column;
        gap: 12px;
    }
    
    .preview-item__index {
        align-self: flex-start;
    }
} 

/* Language Switcher */
.lang-switcher {
    position: relative;
    margin-left: var(--spacing-md);
}

.lang-switcher__toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.05);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.lang-switcher__toggle:hover {
    background: var(--color-primary);
    color: white;
}

.lang-switcher__menu {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: var(--spacing-sm);
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border);
    min-width: 120px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all var(--transition-fast);
    z-index: 1000;
}

.lang-switcher:hover .lang-switcher__menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-switcher__item {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: background var(--transition-fast);
}

.lang-switcher__item:first-child {
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.lang-switcher__item:last-child {
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.lang-switcher__item:hover {
    background: var(--color-background-secondary);
    color: var(--color-primary);
}

.lang-switcher__item.is-active {
    color: var(--color-primary);
    background: rgba(0, 122, 255, 0.08);
}