/* VSS Tools Suite - Shared Stylesheet (Dark/Light Dual Theme) */
:root {
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  /* Dark Theme Default */
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-card: rgba(30, 41, 59, 0.7);
  --bg-card-hover: rgba(30, 41, 59, 0.95);
  --bg-input: #1e293b;
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(56, 189, 248, 0.35);
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --accent-primary: #38bdf8;
  --accent-hover: #0284c7;
  --accent-gradient: linear-gradient(135deg, #38bdf8 0%, #6366f1 100%);
  --accent-glow: rgba(56, 189, 248, 0.2);
  
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.45);
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: #ffffff;
  --bg-input: #f1f5f9;
  --border-color: rgba(0, 0, 0, 0.08);
  --border-hover: rgba(2, 132, 199, 0.35);
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  
  --accent-primary: #0284c7;
  --accent-hover: #0369a1;
  --accent-gradient: linear-gradient(135deg, #0284c7 0%, #4f46e5 100%);
  --accent-glow: rgba(2, 132, 199, 0.15);
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.12);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
  background-image: radial-gradient(circle at 50% 0%, var(--accent-glow) 0%, transparent 60%);
  background-attachment: fixed;
  transition: background-color 0.3s ease, color 0.3s ease;
}

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

/* Header & Nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(11, 15, 25, 0.75);
  border-bottom: 1px solid var(--border-color);
  transition: background-color 0.3s ease;
}

[data-theme="light"] .site-header {
  background: rgba(255, 255, 255, 0.85);
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}

.brand-icon {
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-title {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-badge {
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: rgba(56, 189, 248, 0.15);
  color: var(--accent-primary);
  border: 1px solid rgba(56, 189, 248, 0.25);
  font-weight: 600;
  text-transform: uppercase;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  font-weight: 500;
}

.nav-link:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

[data-theme="light"] .nav-link:hover {
  background: rgba(0, 0, 0, 0.05);
}

.theme-toggle-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: var(--transition);
}

.theme-toggle-btn:hover {
  border-color: var(--accent-primary);
  transform: translateY(-1px);
}

.btn-portal {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  transition: var(--transition);
}

.btn-portal:hover {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: #ffffff;
  box-shadow: 0 4px 12px var(--accent-glow);
}

/* Main Container */
.main-wrapper {
  flex: 1;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 32px 20px 64px;
}

/* Hero Section */
.hero {
  text-align: center;
  margin-bottom: 40px;
}

.hero-title {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto 24px;
}

/* Search & Filter Bar */
.search-box-wrapper {
  max-width: 520px;
  margin: 0 auto 36px;
  position: relative;
}

.search-input {
  width: 100%;
  padding: 14px 20px 14px 44px;
  font-size: 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-primary);
  outline: none;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(10px);
}

.search-input:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-glow);
  background: var(--bg-card-hover);
}

.search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

/* Tool Sections & Grids */
.section-title-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 36px 0 18px;
}

.section-title {
  font-size: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

.section-badge {
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-secondary);
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

/* Tool Card */
.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
}

.tool-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent-gradient);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.tool-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-md);
}

.tool-card:hover::before {
  opacity: 1;
}

.tool-card-header {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 14px;
}

.tool-icon-box {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: rgba(56, 189, 248, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  flex-shrink: 0;
  border: 1px solid rgba(56, 189, 248, 0.2);
}

.tool-info {
  flex: 1;
}

.tool-name {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.tool-arrow {
  color: var(--text-muted);
  font-size: 1.1rem;
  transition: var(--transition);
}

.tool-card:hover .tool-arrow {
  color: var(--accent-primary);
  transform: translateX(4px);
}

.tool-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 16px;
}

.tool-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tool-tag {
  font-size: 0.72rem;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-muted);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

[data-theme="light"] .tool-tag {
  background: #f1f5f9;
  border-color: #e2e8f0;
}

.tool-tag.featured {
  background: rgba(56, 189, 248, 0.12);
  color: var(--accent-primary);
  border-color: rgba(56, 189, 248, 0.25);
  font-weight: 600;
}

/* Tool Workspace Layout */
.tool-workspace {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(12px);
}

.tool-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border-color);
  flex-wrap: wrap;
  gap: 12px;
}

.tool-headline {
  display: flex;
  align-items: center;
  gap: 12px;
}

.tool-headline h1 {
  font-size: 1.6rem;
  font-weight: 800;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.back-link:hover {
  color: var(--text-primary);
  border-color: var(--accent-primary);
}

/* Interactive Components */
.dropzone {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: 40px 20px;
  text-align: center;
  background: rgba(255, 255, 255, 0.02);
  cursor: pointer;
  transition: var(--transition);
  margin-bottom: 24px;
}

.dropzone:hover, .dropzone.dragover {
  border-color: var(--accent-primary);
  background: var(--accent-glow);
}

.dropzone-icon {
  font-size: 3rem;
  margin-bottom: 12px;
  color: var(--accent-primary);
}

.dropzone-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.dropzone-hint {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Buttons & Inputs */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: none;
  transition: var(--transition);
}

.btn-primary {
  background: var(--accent-gradient);
  color: #ffffff;
  box-shadow: 0 4px 14px var(--accent-glow);
}

.btn-primary:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

.btn-secondary:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.btn-success {
  background: var(--success);
  color: #ffffff;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.85rem;
}

/* Form inputs & controls */
.form-group {
  margin-bottom: 18px;
}

.form-label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-secondary);
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-input);
  color: var(--text-primary);
  font-size: 0.95rem;
  outline: none;
  transition: var(--transition);
}

.form-control:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 2px var(--accent-glow);
}

/* Range Slider */
.slider-group {
  display: flex;
  align-items: center;
  gap: 14px;
}

.slider-input {
  flex: 1;
  accent-color: var(--accent-primary);
  height: 6px;
  border-radius: 3px;
  background: var(--border-color);
  cursor: pointer;
}

.slider-val {
  font-weight: 700;
  min-width: 48px;
  color: var(--accent-primary);
}

/* Footer */
.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--border-color);
  padding: 24px 20px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  background: var(--bg-secondary);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 18px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}

.footer-links a:hover {
  color: var(--text-primary);
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toast {
  padding: 12px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 10px;
  animation: slideIn 0.3s ease;
  backdrop-filter: blur(10px);
}

@keyframes slideIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Responsive */
@media (max-width: 768px) {
  .header-container {
    padding: 0 16px;
  }
  .main-wrapper {
    padding: 20px 16px 40px;
  }
  .hero-title {
    font-size: 1.7rem;
  }
  .tools-grid {
    grid-template-columns: 1fr;
  }
  .tool-workspace {
    padding: 20px;
  }
}