/* Wplace Color Converter - Main Styles */
/* 文件标注: public/assets/css/main.css */

:root {
  --primary-500: #6366f1;
  --primary-600: #4f46e5;
  --accent-500: #f59e0b;
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --border-light: #e2e8f0;
  --border-medium: #cbd5e1;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1);
  --shadow-md: 0 10px 15px -3px rgb(0 0 0 / 0.1);
  --transition-base: 200ms ease-out;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-secondary);
}

/* Container */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

/* Header */
.site-header {
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-light);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-4) 0;
}

.logo-section {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-600);
}

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

.nav-list {
  display: flex;
  gap: var(--space-8);
  list-style: none;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.nav-link:hover {
  color: var(--primary-600);
  background-color: #eef2ff;
}

/* Hero Section */
.hero-section {
  padding: 5rem 0 4rem;
  background: linear-gradient(135deg, #eef2ff 0%, #fffbeb 100%);
  position: relative;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: center;
}

@media (min-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr 400px;
  }
}

.hero-title {
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: var(--space-6);
}

@media (min-width: 768px) {
  .hero-title {
    font-size: 3rem;
  }
}

.highlight {
  background: linear-gradient(135deg, var(--primary-600), var(--accent-500));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-8);
  line-height: 1.7;
}

.hero-features {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: var(--space-8);
}

.feature-tag {
  background: var(--bg-primary);
  padding: 0.5rem 1rem;
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 500;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
}

.cta-buttons {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

@media (min-width: 640px) {
  .cta-buttons {
    flex-direction: row;
  }
}

.cta-primary {
  background: var(--primary-600);
  color: white;
  padding: var(--space-4) 2rem;
  border-radius: var(--radius-xl);
  font-weight: 600;
  font-size: 1.125rem;
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-sm);
}

.cta-primary:hover {
  background: #4338ca;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.cta-secondary {
  background: var(--bg-primary);
  color: var(--primary-600);
  padding: var(--space-4) 2rem;
  border-radius: var(--radius-xl);
  font-weight: 600;
  font-size: 1.125rem;
  border: 2px solid #c7d2fe;
  text-decoration: none;
  text-align: center;
  transition: all var(--transition-base);
}

.cta-secondary:hover {
  background: #eef2ff;
  border-color: #a5b4fc;
}

/* Conversion Demo */
.conversion-demo {
  background: var(--bg-primary);
  padding: var(--space-8);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-light);
}

.demo-step {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  margin-bottom: var(--space-4);
}

.demo-image {
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  background: var(--bg-tertiary);
  border-radius: var(--radius-xl);
  border: 2px solid var(--border-light);
}

.demo-arrow {
  font-size: 1.5rem;
  color: var(--primary-500);
  font-weight: bold;
}

.demo-caption {
  text-align: center;
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* App Container */
.converter-section {
  padding: 4rem 0;
}

.app-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  max-width: 1600px;
  margin: 0 auto;
}

@media (min-width: 1024px) {
  .app-container {
    grid-template-columns: 320px 1fr 300px;
    gap: var(--space-8);
  }
}

/* Panel */
.panel {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  overflow: hidden;
}

.panel-header {
  padding: var(--space-6);
  border-bottom: 1px solid var(--border-light);
  background: var(--bg-tertiary);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.panel-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.panel-content {
  padding: var(--space-6);
}

/* Upload Zone */
.upload-zone {
  border: 2px dashed var(--border-medium);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  text-align: center;
  transition: all var(--transition-base);
  cursor: pointer;
  background: var(--bg-primary);
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.upload-zone:hover {
  border-color: var(--primary-500);
  background: #eef2ff;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.upload-icon {
  font-size: 3rem;
  margin-bottom: var(--space-4);
  opacity: 0.6;
}

.upload-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.upload-subtitle {
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.upload-info {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-6);
}

.upload-button {
  background: var(--primary-500);
  color: white;
  border: none;
  padding: 0.75rem var(--space-6);
  border-radius: var(--radius-lg);
  font-weight: 500;
  cursor: pointer;
  transition: background-color var(--transition-base);
  position: relative;
  z-index: 10;
  pointer-events: auto;
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
}

.upload-button:hover {
  background: var(--primary-600);
}

/* Features */
.features-section {
  padding: 5rem 0;
  background: var(--bg-primary);
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: var(--space-4);
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

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

@media (min-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.feature-card {
  background: var(--bg-primary);
  padding: var(--space-8);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-light);
  text-align: center;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-sm);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: #c7d2fe;
}

.feature-icon {
  font-size: 3rem;
  margin-bottom: var(--space-4);
  display: block;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.feature-description {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Footer */
.site-footer {
  background: var(--bg-primary);
  border-top: 1px solid var(--border-light);
  padding: 4rem 0 2rem;
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
}

@media (min-width: 1024px) {
  .footer-content {
    grid-template-columns: 1fr auto;
    gap: 4rem;
  }
}

.disclaimer-notice {
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  display: flex;
  gap: var(--space-4);
  align-items: flex-start;
}

.disclaimer-icon {
  font-size: 1.25rem;
  flex-shrink: 0;
}

.disclaimer-text p {
  margin-bottom: 0.5rem;
  color: #92400e;
}

.disclaimer-text p:last-child {
  margin-bottom: 0;
  font-weight: 600;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-8);
}

.footer-section h4 {
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: var(--space-4);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: 0.5rem;
}

.footer-section a {
  color: var(--text-secondary);
  font-size: 0.875rem;
  text-decoration: none;
  transition: color var(--transition-base);
}

.footer-section a:hover {
  color: var(--primary-600);
}

/* Utilities */
.hidden {
  display: none !important;
}

/* Mobile Menu */
@media (max-width: 767px) {
  .main-nav {
    display: none;
  }
  
  .mobile-menu-toggle {
    display: flex;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    padding: 0.5rem;
    cursor: pointer;
  }
  
  .hamburger-line {
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-base);
  }
}

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