:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #eef2ff;
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --bg: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #fafbfc;
  --text: #0f172a;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --shadow: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-hover: 0 8px 24px rgba(99,102,241,0.15);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
  --card-gradient: linear-gradient(135deg, rgba(99,102,241,0.03) 0%, rgba(168,85,247,0.03) 100%);
  --navbar-bg: rgba(255,255,255,0.88);
  --upload-bg: linear-gradient(135deg, #fafbfc 0%, #f8fafc 100%);
  --upload-bg-hover: linear-gradient(135deg, #eef2ff 0%, #faf5ff 100%);
  --radius: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --nav-h: 64px;
}

[data-theme="dark"] {
  --primary: #818cf8;
  --primary-dark: #6366f1;
  --primary-light: #1e1b4b;
  --success: #34d399;
  --danger: #f87171;
  --warning: #fbbf24;
  --bg: #0f172a;
  --bg-card: #1e293b;
  --bg-card-hover: #334155;
  --text: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border: #334155;
  --border-light: #1e293b;
  --shadow: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-hover: 0 8px 24px rgba(129,140,248,0.25);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.4);
  --card-gradient: linear-gradient(135deg, rgba(99,102,241,0.08) 0%, rgba(168,85,247,0.08) 100%);
  --navbar-bg: rgba(15,23,42,0.92);
  --upload-bg: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
  --upload-bg-hover: linear-gradient(135deg, #1e1b4b 0%, #2e1065 100%);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

.hidden { display: none !important; }

.navbar {
  background: var(--navbar-bg);
  backdrop-filter: saturate(200%) blur(16px);
  -webkit-backdrop-filter: saturate(200%) blur(16px);
  border-bottom: 1px solid rgba(120,120,140,0.15);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: box-shadow 0.35s cubic-bezier(.4,0,.2,1), background 0.35s;
}

.navbar::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(99,102,241,0.4), transparent);
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}

.navbar.scrolled {
  box-shadow: 0 4px 24px rgba(0,0,0,0.08);
}

.navbar.scrolled::before {
  opacity: 1;
}

.nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  height: var(--nav-h);
  gap: 24px;
  position: relative;
}

.logo {
  font-size: 20px;
  font-weight: 800;
  color: var(--primary);
  text-decoration: none;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: transform 0.25s, opacity 0.2s;
  letter-spacing: -0.3px;
}

.logo:hover {
  transform: scale(1.03);
  opacity: 0.9;
}

.nav-categories {
  display: flex;
  gap: 4px;
  flex: 1;
  overflow-x: auto;
  scrollbar-width: none;
  scroll-behavior: smooth;
  padding: 4px;
}
.nav-categories::-webkit-scrollbar { display: none; }

.nav-cat {
  padding: 8px 18px;
  border-radius: 10px;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  transition: all 0.25s cubic-bezier(.4,0,.2,1);
  border: none;
  background: transparent;
  position: relative;
  letter-spacing: 0.1px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.nav-cat-icon {
  font-size: 15px;
  line-height: 1;
}

.nav-cat:hover {
  color: var(--primary);
  background: var(--primary-light);
  transform: translateY(-1px);
}

.nav-cat.active {
  color: #fff;
  background: var(--primary-gradient);
  font-weight: 600;
  box-shadow: 0 4px 14px rgba(99,102,241,0.35);
}

.nav-cat.active::after {
  display: none;
}

.nav-right {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.lang-switch {
  position: relative;
}

.lang-switch select {
  padding: 7px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-card);
  font-size: 14px;
  cursor: pointer;
  color: var(--text);
  outline: none;
  transition: all 0.2s;
  font-weight: 500;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748b' d='M2 4l4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
  padding-right: 26px;
}

.lang-switch select:hover {
  border-color: var(--primary);
}

.lang-switch select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 38px;
  height: 38px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-card);
  cursor: pointer;
  padding: 0 9px;
  transition: all 0.25s cubic-bezier(.4,0,.2,1);
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all 0.35s cubic-bezier(.4,0,.2,1);
  transform-origin: center;
}

.nav-toggle:hover {
  border-color: var(--primary);
  transform: scale(1.05);
}
.nav-toggle:hover span { background: var(--primary); }

.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav-mobile {
  display: none;
  border-top: 1px solid var(--border);
  background: var(--bg-card);
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(.4,0,.2,1);
}

.nav-mobile.open {
  max-height: 500px;
}

.nav-mobile-header {
  padding: 16px 24px 8px;
  font-weight: 700;
  font-size: 16px;
  color: var(--primary);
}

.nav-mobile-categories {
  padding: 8px 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-mobile-categories .nav-cat {
  padding: 14px 18px;
  border-radius: 10px;
  font-size: 15px;
  text-align: left;
  display: flex;
  align-items: center;
  gap: 12px;
  transition: all 0.2s;
}

.nav-mobile-categories .nav-cat-icon {
  font-size: 18px;
  width: 24px;
  text-align: center;
}

.nav-mobile-categories .nav-cat:hover {
  transform: translateX(4px);
}

.nav-mobile-categories .nav-cat.active {
  background: var(--primary-gradient);
  color: #fff;
  font-weight: 600;
}

.nav-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  z-index: 99;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s;
}

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

.navbar.compact .nav-inner {
  height: 52px;
  transition: height 0.3s cubic-bezier(.4,0,.2,1);
}

.navbar.compact .logo {
  font-size: 18px;
}

.navbar.compact .nav-cat {
  padding: 6px 14px;
  font-size: 13px;
}

.nav-scroll-progress {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: var(--primary-gradient);
  border-radius: 0 2px 2px 0;
  transition: width 0.1s linear;
  pointer-events: none;
  z-index: 101;
}

.nav-cat:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.nav-toggle:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.scroll-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: var(--primary-gradient);
  color: #fff;
  font-size: 20px;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(99,102,241,0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.3s cubic-bezier(.4,0,.2,1);
  z-index: 90;
  display: flex;
  align-items: center;
  justify-content: center;
}

.scroll-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.scroll-top:hover {
  transform: translateY(-4px) scale(1.08);
  box-shadow: 0 6px 24px rgba(99,102,241,0.5);
}

.scroll-top:active {
  transform: translateY(0) scale(0.95);
}

@media (max-width: 768px) {
  .scroll-top {
    bottom: 24px;
    right: 20px;
    width: 40px;
    height: 40px;
    font-size: 18px;
  }
}

main {
  flex: 1;
  max-width: 1280px;
  margin: 0 auto;
  padding: 32px 24px;
  width: 100%;
}

.tool-section-title {
  font-size: 20px;
  font-weight: 700;
  margin: 32px 0 16px;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}

.tool-section-title:first-child { margin-top: 0; }

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(.4,0,.2,1);
  position: relative;
  overflow: hidden;
  animation: fadeUp 0.4s ease both;
  background-image: var(--card-gradient);
}

.tool-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--primary-gradient);
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}

.tool-card::after {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(99,102,241,0.1) 0%, transparent 70%);
  opacity: 0;
  transition: opacity 0.4s;
  pointer-events: none;
}

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

.tool-card:hover::before { opacity: 0.05; }
.tool-card:hover::after { opacity: 1; }

.tool-card .tool-emoji {
  font-size: 36px;
  margin-bottom: 14px;
  display: block;
  transition: transform 0.3s;
}

.tool-card:hover .tool-emoji { transform: scale(1.1); }

.tool-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text);
}

.tool-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.badge-new {
  position: absolute;
  top: 16px;
  right: 16px;
  background: var(--primary-gradient);
  color: #fff;
  font-size: 10px;
  padding: 3px 10px;
  border-radius: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  box-shadow: 0 4px 12px rgba(99,102,241,0.3);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 4px 12px rgba(99,102,241,0.3); }
  50% { box-shadow: 0 4px 20px rgba(99,102,241,0.5); }
}

.more-tools {
  text-align: center;
  margin: 32px 0;
}

.more-tools a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
  font-size: 16px;
  transition: color 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

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

.tool-view {
  position: fixed;
  inset: 0;
  background: #fff;
  z-index: 200;
  overflow-y: auto;
  animation: fadeIn 0.3s ease;
}

.tool-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 24px;
}

.tool-header {
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 24px;
}

.tool-header h1 {
  font-size: 24px;
  margin-bottom: 8px;
}

.tool-desc {
  color: var(--text-secondary);
  font-size: 14px;
}

.btn-back {
  background: none;
  border: 1px solid var(--border);
  padding: 6px 14px;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 12px;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.btn-back:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-light); }

.tool-body {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
}

.tool-sidebar {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  height: fit-content;
  position: sticky;
  top: calc(var(--nav-h) + 16px);
  max-height: calc(100vh - var(--nav-h) - 32px);
  overflow-y: auto;
}

.tool-sidebar h3 {
  font-size: 13px;
  font-weight: 600;
  margin: 16px 0 10px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.8px;
}

.tool-sidebar h3:first-child { margin-top: 0; }

.sidebar-list { list-style: none; }

.sidebar-item {
  padding: 9px 12px;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 14px;
  color: var(--text);
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 2px;
}

.sidebar-item:hover { background: var(--primary-light); color: var(--primary); }
.sidebar-item.active { background: var(--primary-light); color: var(--primary); font-weight: 600; }

.sidebar-item .badge-new {
  position: static;
  font-size: 9px;
  padding: 1px 6px;
  margin-left: auto;
  box-shadow: none;
}

.tool-main {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  min-height: 400px;
}

.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius-xl);
  padding: 60px 40px;
  text-align: center;
  transition: all 0.3s;
  cursor: pointer;
  background: var(--upload-bg);
  position: relative;
  overflow: hidden;
}

.upload-zone::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(99,102,241,0.05), rgba(124,58,237,0.05));
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}

.upload-zone:hover {
  border-color: var(--primary);
  background: var(--upload-bg-hover);
  transform: scale(1.01);
}

.upload-zone:hover::before {
  opacity: 1;
}

.upload-zone.dragover {
  border-color: var(--primary);
  background: var(--upload-bg-hover);
  transform: scale(1.02);
  box-shadow: 0 8px 30px rgba(99,102,241,0.2);
}

.upload-zone.dragover::before {
  opacity: 1;
  background: linear-gradient(135deg, rgba(99,102,241,0.1), rgba(124,58,237,0.1));
}

.upload-zone.uploading {
  border-color: var(--accent);
  animation: uploadPulse 1.5s ease-in-out infinite;
}

@keyframes uploadPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(99,102,241,0.3); }
  50% { box-shadow: 0 0 0 12px rgba(99,102,241,0); }
}

.upload-icon {
  font-size: 48px;
  margin-bottom: 16px;
}

.upload-zone h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.upload-zone p {
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: 20px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  border: none;
  padding: 10px 24px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s;
  box-shadow: 0 2px 6px rgba(45,140,240,0.3);
}

.btn-primary:hover { box-shadow: 0 4px 12px rgba(45,140,240,0.4); transform: translateY(-1px); }
.btn-primary:active { transform: translateY(0); }
.btn-primary:disabled { background: var(--text-muted); cursor: not-allowed; box-shadow: none; }

.btn-secondary {
  background: #fff;
  color: var(--text);
  border: 1px solid var(--border);
  padding: 8px 16px;
  border-radius: var(--radius);
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
  font-weight: 500;
}

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

.work-area {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.settings-panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

.settings-row {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.settings-row:last-child { margin-bottom: 0; }

.settings-row label {
  font-size: 14px;
  color: var(--text);
  min-width: 120px;
  font-weight: 500;
}

.settings-row input[type="number"],
.settings-row input[type="text"],
.settings-row input[type="url"],
.settings-row select {
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  outline: none;
  background: #fff;
  color: var(--text);
  transition: border-color 0.2s, box-shadow 0.2s;
  font-family: inherit;
}

.settings-row input[type="number"]:focus,
.settings-row input[type="text"]:focus,
.settings-row input[type="url"]:focus,
.settings-row select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
}

.url-input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  flex: 1;
  min-width: 300px;
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all 0.3s cubic-bezier(.4,0,.2,1);
  overflow: hidden;
}

.url-input-wrapper:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(99,102,241,0.12), 0 4px 16px rgba(99,102,241,0.08);
  background: #fff;
}

.url-input-wrapper .url-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 100%;
  min-height: 42px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
  font-size: 16px;
  flex-shrink: 0;
  position: relative;
}

.url-input-wrapper .url-icon::after {
  content: '';
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 1px;
  height: 60%;
  background: rgba(255,255,255,0.3);
}

.url-input-wrapper input[type="url"],
.url-input-wrapper input[type="text"] {
  flex: 1;
  border: none !important;
  background: transparent !important;
  padding: 10px 14px;
  font-size: 14px;
  color: var(--text);
  outline: none !important;
  box-shadow: none !important;
  min-width: 0;
  font-family: inherit;
}

.url-input-wrapper input::placeholder {
  color: var(--text-muted);
  opacity: 0.7;
}

.url-input-wrapper .url-actions {
  display: flex;
  align-items: center;
  gap: 2px;
  padding-right: 6px;
  flex-shrink: 0;
}

.url-input-wrapper .url-copy {
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 6px 8px;
  border-radius: var(--radius);
  color: var(--text-secondary);
  font-size: 14px;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 4px;
}

.url-input-wrapper .url-copy:hover {
  background: var(--primary-light);
  color: var(--primary);
}

.url-input-wrapper .url-copy.copied {
  background: var(--success);
  color: #fff;
}

.url-input-wrapper .url-clear {
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 6px;
  border-radius: 50%;
  color: var(--text-muted);
  font-size: 14px;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
}

.url-input-wrapper .url-clear:hover {
  background: #fee2e2;
  color: #ef4444;
}

.url-input-wrapper .url-clear.hidden {
  display: none;
}

.url-input-wrapper .url-loading {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--primary-dark));
  transition: width 0.3s ease;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.url-input-wrapper.token-mode .url-icon {
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
}

.url-hint {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 10px;
  padding: 10px 14px;
  background: var(--primary-light);
  border: 1px solid rgba(99,102,241,0.15);
  border-radius: var(--radius);
  color: var(--text-secondary);
  font-size: 12px;
  line-height: 1.5;
}

.url-hint .hint-icon {
  font-size: 14px;
  flex-shrink: 0;
}

.url-hint code {
  background: var(--bg-card);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 11px;
  color: var(--primary);
  font-family: 'SF Mono', monospace;
}

.settings-row input[type="range"] {
  flex: 1;
  max-width: 300px;
  accent-color: var(--primary);
}

.settings-row .value-display {
  font-weight: 600;
  color: var(--primary);
  min-width: 60px;
  text-align: right;
}

.file-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.file-item {
  display: grid;
  grid-template-columns: 48px 1fr auto auto;
  gap: 16px;
  align-items: center;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
  transition: all 0.25s;
  position: relative;
  animation: fadeUp 0.3s ease;
}

.file-item:hover { 
  border-color: var(--primary); 
  box-shadow: 0 4px 16px rgba(99,102,241,0.12); 
  transform: translateY(-1px);
}

.file-item.processing {
  border-color: var(--accent);
  background: linear-gradient(135deg, var(--bg-card), rgba(99,102,241,0.05));
}

.file-item.error {
  border-color: var(--danger);
  background: linear-gradient(135deg, var(--bg-card), rgba(239,68,68,0.05));
}

.file-item.processed {
  border-color: var(--success);
  background: linear-gradient(135deg, var(--bg-card), rgba(16,185,129,0.05));
}

.file-thumb {
  width: 48px;
  height: 48px;
  border-radius: 8px;
  background: linear-gradient(135deg, #f0f1f3, #e4e6eb);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  overflow: hidden;
  transition: all 0.3s;
}

.file-item:hover .file-thumb {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  transform: scale(1.05);
}

.file-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.file-info { min-width: 0; }
.file-name {
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-size {
  font-size: 12px;
  color: var(--text-secondary);
}

.file-actions { display: flex; gap: 8px; align-items: center; }

.size-compare {
  font-size: 12px;
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 600;
}

.size-reduced { background: #f6ffed; color: var(--success); }
.size-increased { background: #fff2f0; color: var(--danger); }
.size-same { background: #f5f5f5; color: var(--text-secondary); }

.btn-download, .btn-remove {
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  font-size: 16px;
  border-radius: var(--radius);
  transition: all 0.2s;
}

.btn-download:hover { background: var(--primary-light); }
.btn-remove:hover { background: #fff1f0; }

.progress-bar {
  width: 100%;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--primary-gradient);
  border-radius: 2px;
  transition: width 0.3s;
}

.action-bar {
  display: flex;
  gap: 12px;
  justify-content: center;
  padding: 20px;
  background: var(--bg);
  border-radius: var(--radius);
}

.toast {
  position: fixed;
  top: 80px;
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  background: var(--text);
  color: #fff;
  padding: 14px 28px;
  border-radius: var(--radius-lg);
  font-size: 14px;
  font-weight: 500;
  z-index: 9999;
  opacity: 0;
  transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  pointer-events: none;
  box-shadow: 0 10px 40px rgba(0,0,0,0.2);
  display: flex;
  align-items: center;
  gap: 10px;
  backdrop-filter: blur(10px);
}

.toast::before {
  content: '';
  width: 20px;
  height: 20px;
  background-size: contain;
  background-repeat: no-repeat;
  flex-shrink: 0;
}

.toast.show { 
  opacity: 1; 
  transform: translateX(-50%) translateY(0); 
}

.toast.success { 
  background: linear-gradient(135deg, #10b981, #059669); 
  box-shadow: 0 10px 40px rgba(16,185,129,0.4);
}

.toast.success::before {
  content: '✓';
  color: #fff;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.25);
  border-radius: 50%;
  width: 20px;
  height: 20px;
}

.toast.error { 
  background: linear-gradient(135deg, #ef4444, #dc2626); 
  box-shadow: 0 10px 40px rgba(239,68,68,0.4);
}

.toast.error::before {
  content: '✕';
  color: #fff;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.25);
  border-radius: 50%;
  width: 20px;
  height: 20px;
}

.toast:not(.success):not(.error)::before {
  content: 'ℹ';
  color: #fff;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.25);
  border-radius: 50%;
  width: 20px;
  height: 20px;
}

.lang-prompt-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.lang-prompt-overlay.show {
  opacity: 1;
}

.lang-prompt-box {
  background: var(--bg-card);
  border-radius: 16px;
  padding: 32px;
  max-width: 420px;
  width: 90%;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
  transform: scale(0.9);
  transition: transform 0.3s ease;
}

.lang-prompt-overlay.show .lang-prompt-box {
  transform: scale(1);
}

.lang-prompt-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  background: var(--primary-gradient);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
}

.lang-prompt-box h3 {
  margin: 0 0 12px;
  font-size: 20px;
  color: var(--text);
}

.lang-prompt-box p {
  margin: 0 0 24px;
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.5;
}

.lang-prompt-buttons {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
}

.lang-prompt-buttons .btn-primary,
.lang-prompt-buttons .btn-secondary {
  flex: 1;
  padding: 12px 20px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
}

.lang-prompt-buttons .btn-primary {
  background: var(--primary-gradient);
  color: white;
}

.lang-prompt-buttons .btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(99,102,241,0.4);
}

.lang-prompt-buttons .btn-secondary {
  background: var(--bg);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.lang-prompt-buttons .btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.lang-prompt-remember {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
  cursor: pointer;
}

.lang-prompt-remember input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--primary);
}

[data-theme="dark"] .lang-prompt-box {
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}

[data-theme="dark"] .lang-prompt-overlay {
  background: rgba(0,0,0,0.7);
}

.footer {
  text-align: center;
  padding: 24px;
  color: var(--text-muted);
  font-size: 13px;
  border-top: 1px solid var(--border);
  background: var(--bg-card);
}

.loading-spinner {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2.5px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

.file-progress {
  margin-top: 8px;
}

.file-progress-bar {
  background: var(--border);
  border-radius: 6px;
  height: 6px;
  overflow: hidden;
  position: relative;
}

.file-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 6px;
  transition: width 0.4s ease;
  position: relative;
  overflow: hidden;
}

.file-progress-fill::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  animation: progressShimmer 1.5s infinite;
  pointer-events: none;
}

@keyframes progressShimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

.file-progress-text {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 4px;
  display: flex;
  justify-content: space-between;
}

.file-error-msg {
  margin-top: 8px;
  padding: 8px 12px;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: 6px;
  font-size: 12px;
  color: var(--danger);
  display: flex;
  align-items: center;
  gap: 6px;
  animation: fadeUp 0.3s ease;
}

.file-error-msg::before {
  content: '⚠️';
  font-size: 14px;
}

.file-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 600;
}

.file-status-badge.processing {
  background: rgba(99,102,241,0.15);
  color: var(--primary);
}

.file-status-badge.done {
  background: rgba(16,185,129,0.15);
  color: var(--success);
}

.file-status-badge.error {
  background: rgba(239,68,68,0.15);
  color: var(--danger);
}

@keyframes spin { to { transform: rotate(360deg); } }

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

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@media (max-width: 768px) {
  .nav-inner { padding: 0 16px; gap: 12px; }
  .logo { font-size: 17px; }
  .nav-categories { display: none; }
  .nav-toggle { display: flex; }
  .nav-actions { gap: 8px; }
  .lang-switch select { padding: 6px 10px; font-size: 13px; }
  main { padding: 20px 16px; }
  .tool-body { grid-template-columns: 1fr; }
  .tool-sidebar { position: static; max-height: none; }
  .tool-main { padding: 20px 16px; }
  .tool-grid { grid-template-columns: 1fr; }
  .upload-zone { padding: 40px 20px; }
  .file-item { grid-template-columns: 40px 1fr auto; gap: 8px; }
  .file-thumb { width: 40px; height: 40px; font-size: 18px; }
  .size-compare { display: none; }
  .settings-row label { min-width: auto; }
  .tool-container { padding: 16px; }
  .action-bar { flex-wrap: wrap; }
  .action-bar .btn-primary, .action-bar .btn-secondary { flex: 1; min-width: 120px; }
}

@media (max-width: 480px) {
  .tool-section-title { font-size: 18px; }
  .tool-card { padding: 18px; }
  .tool-card .tool-emoji { font-size: 28px; }
  .upload-zone { padding: 32px 16px; }
  .lang-switch select { font-size: 13px; padding: 5px 8px; }
}

.theme-switcher {
  position: relative;
  display: inline-block;
}

.theme-btn {
  width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  transition: all 0.2s;
}

.theme-btn:hover {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.1);
}

.theme-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 8px;
  min-width: 180px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all 0.25s cubic-bezier(.4,0,.2,1);
  z-index: 1000;
}

.theme-switcher.open .theme-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.theme-option {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 10px 12px;
  border: none;
  background: transparent;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 14px;
  color: var(--text);
  transition: all 0.2s;
  text-align: left;
}

.theme-option:hover {
  background: var(--primary-light);
  color: var(--primary);
}

.theme-option.active {
  background: var(--primary-light);
  color: var(--primary);
  font-weight: 600;
}

.theme-emoji {
  font-size: 18px;
  width: 24px;
  text-align: center;
}

.featured-card {
  background: var(--primary-gradient);
  color: #fff;
  border: none;
  position: relative;
  overflow: hidden;
}

.featured-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, transparent 60%);
  opacity: 1;
  pointer-events: none;
}

.featured-card h3,
.featured-card p {
  color: #fff;
}

.featured-card .badge-new {
  background: rgba(255,255,255,0.25);
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.featured-card:hover {
  box-shadow: 0 12px 32px rgba(99,102,241,0.4);
}

.glass-card {
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.2);
}

[data-theme="dark"] .glass-card {
  background: rgba(30,41,59,0.6);
  border-color: rgba(255,255,255,0.1);
}

.stat-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all 0.3s;
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.stat-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  background: var(--primary-light);
}

.stat-content h4 {
  font-size: 24px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}

.stat-content p {
  font-size: 13px;
  color: var(--text-secondary);
}

.premium-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background: linear-gradient(135deg, #fbbf24, #f59e0b);
  color: #fff;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  box-shadow: 0 2px 8px rgba(251,191,36,0.3);
}

.tooltip {
  position: relative;
}

.tooltip::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  background: var(--text);
  color: var(--bg-card);
  padding: 6px 12px;
  border-radius: var(--radius);
  font-size: 12px;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s;
  pointer-events: none;
  z-index: 1000;
}

.tooltip:hover::after {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.shimmer-card {
  position: relative;
  overflow: hidden;
}

.shimmer-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255,255,255,0.1) 50%,
    transparent 100%
  );
  animation: shimmer 3s infinite;
  pointer-events: none;
}

@keyframes shimmer {
  0% { left: -100%; }
  100% { left: 100%; }
}

[data-theme="dark"] .shimmer-card::before {
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255,255,255,0.05) 50%,
    transparent 100%
  );
}

.gradient-border {
  position: relative;
}

.gradient-border::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  padding: 2px;
  background: var(--primary-gradient);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}

.gradient-border:hover::before {
  opacity: 1;
}

.card-3d {
  transform-style: preserve-3d;
  perspective: 1000px;
}

.card-3d:hover {
  transform: translateY(-4px) rotateX(2deg);
}

.float-animation {
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.glow-effect {
  position: relative;
}

.glow-effect::after {
  content: '';
  position: absolute;
  inset: -2px;
  background: var(--primary-gradient);
  border-radius: var(--radius-lg);
  opacity: 0;
  filter: blur(8px);
  transition: opacity 0.3s;
  z-index: -1;
}

.glow-effect:hover::after {
  opacity: 0.5;
}

.slide-in {
  animation: slideIn 0.4s cubic-bezier(.4,0,.2,1) both;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.scale-in {
  animation: scaleIn 0.3s cubic-bezier(.4,0,.2,1) both;
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.bounce-in {
  animation: bounceIn 0.5s cubic-bezier(.68,-.55,.27,1.55) both;
}

@keyframes bounceIn {
  from {
    opacity: 0;
    transform: scale(0.3);
  }
  50% {
    transform: scale(1.05);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.ripple {
  position: relative;
  overflow: hidden;
}

.ripple::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle, rgba(99,102,241,0.3) 0%, transparent 70%);
  transform: scale(0);
  opacity: 0;
  transition: transform 0.5s, opacity 0.3s;
  pointer-events: none;
}

.ripple:active::after {
  transform: scale(2);
  opacity: 1;
  transition: 0s;
}

.transition-theme {
  transition: all 0.3s cubic-bezier(.4,0,.2,1);
}

[data-theme="dark"] .tool-card {
  box-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

[data-theme="dark"] .tool-card:hover {
  box-shadow: 0 8px 24px rgba(129,140,248,0.25);
}

[data-theme="dark"] .btn-primary {
  box-shadow: 0 2px 6px rgba(129,140,248,0.3);
}

[data-theme="dark"] .btn-primary:hover {
  box-shadow: 0 4px 12px rgba(129,140,248,0.4);
}

[data-theme="dark"] .badge-new {
  box-shadow: 0 4px 12px rgba(129,140,248,0.4);
}

[data-theme="dark"] .file-item {
  background: var(--bg-card-hover);
}

[data-theme="dark"] .file-item:hover {
  box-shadow: 0 2px 8px rgba(129,140,248,0.15);
}

[data-theme="dark"] .settings-panel {
  background: var(--bg-card);
}

[data-theme="dark"] .url-input-wrapper {
  background: var(--bg-card-hover);
  border-color: var(--border);
}

[data-theme="dark"] .url-input-wrapper:focus-within {
  background: var(--bg-card);
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(129,140,248,0.15), 0 4px 16px rgba(129,140,248,0.12);
}

[data-theme="dark"] .url-input-wrapper input {
  color: var(--text);
}

[data-theme="dark"] .url-input-wrapper .url-copy {
  color: var(--text-secondary);
}

[data-theme="dark"] .url-input-wrapper .url-copy:hover {
  background: var(--primary-light);
  color: var(--primary);
}

[data-theme="dark"] .url-input-wrapper .url-clear:hover {
  background: rgba(239,68,68,0.15);
  color: #f87171;
}

[data-theme="dark"] .url-hint {
  background: rgba(129,140,248,0.1);
  border-color: rgba(129,140,248,0.2);
  color: var(--text-secondary);
}

[data-theme="dark"] .url-hint code {
  background: var(--bg-card);
  color: var(--primary);
}

[data-theme="dark"] .settings-row input[type="url"],
[data-theme="dark"] .settings-row input[type="text"] {
  background: var(--bg-card);
  border-color: var(--border);
  color: var(--text);
}

[data-theme="dark"] .settings-row input[type="url"]:focus,
[data-theme="dark"] .settings-row input[type="text"]:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(129,140,248,0.2);
}

[data-theme="dark"] .upload-icon {
  filter: drop-shadow(0 2px 4px rgba(129,140,248,0.3));
}

.theme-transition * {
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease !important;
}

[data-theme="dark"] .nav-toggle {
  background: var(--bg-card);
}

[data-theme="dark"] .nav-toggle span {
  background: var(--text);
}

[data-theme="dark"] .lang-switch select {
  background: var(--bg-card);
}

[data-theme="dark"] .theme-btn {
  background: var(--bg-card);
}

[data-theme="dark"] .theme-dropdown {
  box-shadow: 0 12px 40px rgba(0,0,0,0.5);
}

[data-theme="dark"] .loading-spinner {
  border-color: var(--border);
  border-top-color: var(--primary);
}

[data-theme="dark"] .progress-bar {
  background: var(--border);
}

[data-theme="dark"] .size-reduced {
  background: rgba(16,185,129,0.15);
  color: var(--success);
}

[data-theme="dark"] .size-increased {
  background: rgba(239,68,68,0.15);
  color: var(--danger);
}

[data-theme="dark"] .size-same {
  background: rgba(100,116,139,0.15);
  color: var(--text-secondary);
}

[data-theme="dark"] ::selection {
  background: rgba(129,140,248,0.3);
  color: #fff;
}

[data-theme="dark"] ::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

[data-theme="dark"] ::-webkit-scrollbar-track {
  background: var(--bg);
}

[data-theme="dark"] ::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 5px;
}

[data-theme="dark"] ::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

[data-theme="dark"] .more-tools a {
  color: var(--primary);
}

[data-theme="dark"] .more-tools a:hover {
  color: var(--primary-dark);
}

[data-theme="dark"] .sidebar-item:hover {
  background: var(--primary-light);
  color: var(--primary);
}

[data-theme="dark"] .sidebar-item.active {
  background: var(--primary-light);
  color: var(--primary);
}

[data-theme="dark"] .btn-secondary {
  background: var(--bg-card);
  color: var(--text);
}

[data-theme="dark"] .btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-light);
}

[data-theme="dark"] .toast {
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
}

[data-theme="dark"] .nav-mobile {
  background: var(--bg-card);
}

[data-theme="dark"] .nav-mobile-header {
  color: var(--primary);
}

[data-theme="dark"] .lang-switch select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2394a3b8' d='M2 4l4 4 4-4'/%3E%3C/svg%3E");
}

[data-theme="dark"] .nav-backdrop {
  background: rgba(0,0,0,0.6);
}

[data-theme="dark"] .scroll-top {
  box-shadow: 0 4px 16px rgba(0,0,0,0.5);
}

@media (max-width: 768px) {
  .theme-switcher {
    order: -1;
  }
  
  .theme-dropdown {
    right: -8px;
    min-width: 160px;
  }
  
  .theme-option {
    padding: 8px 10px;
    font-size: 13px;
  }
  
  .theme-emoji {
    font-size: 16px;
    width: 20px;
  }
  
  .featured-card {
    min-height: 180px;
  }
  
  .stat-card {
    padding: 16px;
  }
  
  .stat-icon {
    width: 40px;
    height: 40px;
    font-size: 20px;
  }
  
  .stat-content h4 {
    font-size: 20px;
  }
}

@media (max-width: 480px) {
  .theme-btn {
    width: 32px;
    height: 32px;
    font-size: 16px;
  }
  
  .nav-right {
    gap: 8px;
  }
  
  .lang-switch select {
    padding: 4px 6px;
    font-size: 12px;
  }
  
  .premium-badge {
    font-size: 10px;
    padding: 3px 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  .shimmer-card::before {
    animation: none;
  }
  
  .float-animation {
    animation: none;
  }
  
  .badge-new {
    animation: none;
  }
}

/* 网速测试样式 - 升级版 */
.speed-test-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 40px 24px;
  position: relative;
}

.speed-test-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(99,102,241,0.15) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.speed-gauge {
  display: flex;
  justify-content: center;
  margin-bottom: 40px;
  position: relative;
  z-index: 1;
}

.gauge-circle {
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: linear-gradient(145deg, var(--primary), #7c3aed);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  box-shadow: 
    0 20px 60px rgba(99,102,241,0.4),
    0 0 100px rgba(99,102,241,0.15),
    inset 0 2px 4px rgba(255,255,255,0.2);
  transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  animation: gaugePulse 3s ease-in-out infinite;
}

.gauge-circle.testing {
  animation: gaugePulse 1.5s ease-in-out infinite;
  box-shadow: 
    0 20px 60px rgba(99,102,241,0.5),
    0 0 120px rgba(99,102,241,0.25),
    inset 0 2px 4px rgba(255,255,255,0.2),
    0 0 0 4px rgba(99,102,241,0.3);
}

@keyframes gaugePulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.02); }
}

.gauge-circle::before {
  content: '';
  position: absolute;
  inset: 6px;
  border-radius: 50%;
  background: var(--bg-card);
  box-shadow: inset 0 4px 12px rgba(0,0,0,0.1);
}

.gauge-circle::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient(var(--primary) 0%, transparent 0%);
  animation: rotate 2s linear infinite;
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}

.gauge-circle.testing::after {
  opacity: 0.6;
  animation: rotate 2s linear infinite;
}

@keyframes rotate {
  to { transform: rotate(360deg); }
}

.gauge-value {
  position: relative;
  z-index: 1;
  font-size: 52px;
  font-weight: 800;
  color: var(--text);
  line-height: 1;
  font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  letter-spacing: -2px;
  text-shadow: 0 2px 10px rgba(99,102,241,0.2);
  transition: color 0.3s;
}

.gauge-circle.testing .gauge-value {
  animation: valueShimmer 1s ease-in-out infinite;
}

@keyframes valueShimmer {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

.gauge-unit {
  position: relative;
  z-index: 1;
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 6px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.gauge-label {
  position: relative;
  z-index: 1;
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 10px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.gauge-label::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success, #10b981);
  box-shadow: 0 0 8px var(--success, #10b981);
}

.gauge-label.testing::before {
  background: var(--warning, #f59e0b);
  box-shadow: 0 0 8px var(--warning, #f59e0b);
  animation: blink 1s ease-in-out infinite;
}

@keyframes blink {
  50% { opacity: 0.3; }
}

.speed-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 32px;
  position: relative;
  z-index: 1;
}

.stat-card {
  background: var(--bg-card);
  border-radius: 16px;
  padding: 24px 20px;
  text-align: center;
  box-shadow: 
    0 4px 20px rgba(0,0,0,0.05),
    0 0 0 1px var(--border);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  opacity: 0;
  transition: opacity 0.3s;
}

.stat-card:hover {
  transform: translateY(-6px);
  box-shadow: 
    0 12px 40px rgba(0,0,0,0.1),
    0 0 0 1px var(--primary-light);
}

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

.stat-icon {
  width: 52px;
  height: 52px;
  margin: 0 auto 12px;
  background: linear-gradient(135deg, var(--primary-light), rgba(99,102,241,0.15));
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  box-shadow: inset 0 2px 4px rgba(255,255,255,0.3);
}

.stat-value {
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
  font-family: 'SF Pro Display', system-ui, sans-serif;
  letter-spacing: -0.5px;
}

.stat-label {
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 10px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.stat-level {
  font-size: 11px;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 20px;
  display: inline-block;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  transition: all 0.3s;
}

.speed-progress {
  margin-bottom: 28px;
  position: relative;
  z-index: 1;
}

.progress-bar {
  width: 100%;
  height: 10px;
  background: var(--border);
  border-radius: 5px;
  overflow: hidden;
  margin-bottom: 10px;
  position: relative;
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.1);
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent), var(--primary));
  background-size: 200% 100%;
  border-radius: 5px;
  transition: width 0.3s ease;
  animation: progressShimmer 2s linear infinite;
  position: relative;
}

@keyframes progressShimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.progress-fill::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  animation: shimmer 1.5s ease-in-out infinite;
  pointer-events: none;
}

@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

.progress-text {
  text-align: center;
  font-size: 14px;
  color: var(--text-secondary);
  font-weight: 600;
  font-family: 'SF Mono', monospace;
}

.btn-start-test {
  width: 100%;
  padding: 18px 32px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  border: none;
  border-radius: 16px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 
    0 10px 30px rgba(99,102,241,0.35),
    0 0 0 0 rgba(99,102,241,0.4);
  position: relative;
  overflow: hidden;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.btn-start-test::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.2), transparent);
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}

.btn-start-test:hover:not(:disabled) {
  transform: translateY(-3px);
  box-shadow: 
    0 15px 40px rgba(99,102,241,0.45),
    0 0 0 0 rgba(99,102,241,0.5);
}

.btn-start-test:hover:not(:disabled)::before {
  opacity: 1;
}

.btn-start-test:active:not(:disabled) {
  transform: translateY(-1px);
}

.btn-start-test:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  animation: btnLoading 1.5s ease-in-out infinite;
}

@keyframes btnLoading {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 0.8; }
}

@media (max-width: 768px) {
  .speed-test-container {
    padding: 30px 16px;
  }
  
  .speed-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }
  
  .gauge-circle {
    width: 180px;
    height: 180px;
  }
  
  .gauge-value {
    font-size: 42px;
  }
  
  .stat-card {
    padding: 20px 16px;
  }
  
  .stat-icon {
    width: 44px;
    height: 44px;
    font-size: 22px;
  }
  
  .stat-value {
    font-size: 18px;
  }
}

@media (max-width: 480px) {
  .speed-test-container {
    padding: 24px 12px;
  }
  
  .speed-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }
  
  .gauge-circle {
    width: 160px;
    height: 160px;
  }
  
  .gauge-value {
    font-size: 36px;
  }
  
  .stat-card {
    padding: 16px 12px;
  }
  
  .stat-value {
    font-size: 16px;
  }
  
  .btn-start-test {
    padding: 14px 24px;
    font-size: 14px;
  }
}

[data-theme="dark"] .gauge-circle {
  box-shadow: 
    0 20px 60px rgba(129,140,248,0.4),
    0 0 100px rgba(129,140,248,0.15),
    inset 0 2px 4px rgba(255,255,255,0.1);
}

[data-theme="dark"] .stat-card {
  background: var(--bg-card);
  box-shadow: 
    0 4px 20px rgba(0,0,0,0.3),
    0 0 0 1px var(--border);
}

[data-theme="dark"] .btn-start-test {
  box-shadow: 
    0 10px 30px rgba(129,140,248,0.35),
    0 0 0 0 rgba(129,140,248,0.4);
}

[data-theme="dark"] .btn-start-test:hover:not(:disabled) {
  box-shadow: 
    0 15px 40px rgba(129,140,248,0.45),
    0 0 0 0 rgba(129,140,248,0.5);
}

.qr-text-area,
.qr-file-area {
  max-width: 600px;
  margin: 0 auto;
}

.text-tool-area label {
  display: block;
  margin-bottom: 8px;
}

.text-tool-area textarea,
.text-tool-area input[type="text"],
.text-tool-area input[type="number"] {
  transition: border-color 0.2s, box-shadow 0.2s;
}

.text-tool-area textarea:focus,
.text-tool-area input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

.text-tool-area select {
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
}

.text-tool-area .btn-primary {
  background: var(--primary);
  color: white;
  border: none;
}

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

.text-tool-area .btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.text-tool-area .btn-secondary:hover {
  background: var(--bg-hover);
}

.text-tool-area .btn-action {
  transition: all 0.15s ease;
}

.text-tool-area .btn-action:hover {
  background: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary);
}

.text-tool-area .btn-action:active {
  transform: scale(0.97);
}

@media (max-width: 640px) {
  .text-tool-area [style*="grid-template-columns: 1fr 1fr"] {
    grid-template-columns: 1fr !important;
  }
}

.calc-container {
  max-width: 500px;
  margin: 0 auto;
}

.calc-container h3 {
  text-align: center;
  margin-bottom: 20px;
  color: var(--text);
  font-weight: 600;
}

.calc-btn {
  user-select: none;
  transition: all 0.12s ease !important;
}

.calc-btn:active {
  transform: scale(0.94);
  filter: brightness(0.92);
}

.calc-display {
  box-shadow: inset 0 1px 3px rgba(0,0,0,0.08);
}

.calc-result {
  transition: all 0.2s ease;
}

.calc-result:hover {
  border-color: var(--primary);
}

.calc-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.calc-tabs button {
  transition: all 0.15s ease;
}

@media (max-width: 480px) {
  .calc-container {
    padding: 12px;
  }
  .calc-btn {
    padding: 12px !important;
    font-size: 16px !important;
  }
  .calc-display {
    font-size: 22px !important;
    padding: 14px !important;
  }
}

.qr-input-section {
  margin-bottom: 24px;
}

.qr-type-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
  background: var(--bg-card);
  border-radius: 10px;
  padding: 4px;
  border: 1px solid var(--border);
}

.qr-tab {
  flex: 1;
  padding: 10px 16px;
  border: none;
  background: transparent;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all 0.2s;
}

.qr-tab:hover {
  color: var(--text);
  background: var(--primary-light);
}

.qr-tab.active {
  background: var(--primary-gradient);
  color: #fff;
  box-shadow: 0 2px 8px rgba(99,102,241,0.3);
}

.qr-generate-btn {
  width: 100%;
  padding: 14px 24px;
  font-size: 16px;
  font-weight: 600;
}

.qr-result-section {
  margin-top: 24px;
  animation: fadeUp 0.4s ease;
}

.qr-result-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.05);
}

.qr-result-image {
  background: #fff;
  padding: 16px;
  border-radius: 12px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.08);
}

.qr-result-image img {
  display: block;
  max-width: 300px;
  max-height: 300px;
}

.qr-result-info {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.qr-result-row {
  font-size: 13px;
  color: var(--text-secondary);
}

.qr-url-display {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 13px;
  word-break: break-all;
  max-height: 80px;
  overflow-y: auto;
}

.qr-url-display code {
  font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
  color: var(--text);
}

.qr-countdown {
  text-align: center;
  padding: 10px;
  background: var(--primary-light);
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

.qr-result-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 8px;
}

.qr-result-actions button {
  flex: 1;
  min-width: 120px;
  padding: 10px 16px;
  font-size: 14px;
}

.qr-download-section {
  margin-top: 16px;
  text-align: center;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.qr-file-download {
  display: inline-block;
  padding: 12px 24px;
  text-decoration: none;
  background: linear-gradient(135deg, #10b981, #059669);
  color: #fff;
  border-radius: 10px;
  font-weight: 600;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
}

.qr-file-download:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(16,185,129,0.4);
}

.qr-file-upload {
  border: 2px dashed var(--border);
  border-radius: 16px;
  padding: 48px 32px;
  text-align: center;
  transition: all 0.3s;
  background: var(--bg-card);
}

.qr-file-upload:hover {
  border-color: var(--primary);
  background: var(--primary-light);
}

.qr-file-upload .upload-icon {
  font-size: 48px;
  margin-bottom: 16px;
}

.qr-file-upload h3 {
  margin: 0 0 8px;
  font-size: 18px;
  color: var(--text);
}

.qr-file-upload p {
  margin: 0 0 20px;
  color: var(--text-secondary);
  font-size: 14px;
}

.qr-progress {
  text-align: center;
  padding: 40px;
}

@media (max-width: 480px) {
  .qr-result-card {
    padding: 20px;
  }
  .qr-result-image img {
    max-width: 240px;
    max-height: 240px;
  }
  .qr-result-actions button {
    min-width: 100%;
  }
  .qr-file-upload {
    padding: 32px 20px;
  }
}