/* ===== DeepSina 专业商务配色系统 ===== */
:root {
  --primary: #1a56db;
  --primary-dark: #1e429f;
  --primary-light: #e8f0fe;
  --accent: #0ea5e9;
  --text-primary: #111827;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;
  --bg-white: #ffffff;
  --bg-light: #f9fafb;
  --bg-section: #f3f4f6;
  --border: #e5e7eb;
  --border-light: #f3f4f6;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.10);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --navbar-h: 64px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  color: var(--text-primary);
  background: var(--bg-white);
  line-height: 1.6;
  min-height: 100vh;
}

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

/* ===== 导航栏 ===== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--navbar-h);
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  z-index: 1000;
  box-shadow: var(--shadow-sm);
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
}

.navbar-brand img {
  height: 32px;
  width: auto;
  object-fit: contain;
}

.navbar-brand span { color: var(--primary); }

.navbar-nav {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.navbar-nav a {
  font-size: 15px;
  color: var(--text-secondary);
  font-weight: 500;
  transition: color 0.2s;
  text-decoration: none;
}

.navbar-nav a:hover { color: var(--primary); }

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

.btn-ghost {
  padding: 8px 18px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  background: transparent;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}

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

.btn-primary {
  padding: 8px 20px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(26,86,219,0.3);
}

.btn-primary-lg {
  padding: 14px 32px;
  font-size: 16px;
  border-radius: var(--radius-md);
}

.user-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--primary-light);
  border-radius: 20px;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s;
}

.user-badge:hover { background: #d1e0fd; }

.user-avatar {
  width: 28px;
  height: 28px;
  background: var(--primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
}

.user-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--primary-dark);
}

/* ===== 主内容区 ===== */
.main-content {
  padding-top: var(--navbar-h);
  min-height: 100vh;
}

/* ===== Hero 区域 ===== */
.hero {
  background: linear-gradient(135deg, #f0f4ff 0%, #e8f0fe 50%, #f0f9ff 100%);
  padding: 64px 40px 48px;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  background: white;
  border: 1px solid #c7d7f9;
  border-radius: 20px;
  font-size: 13px;
  color: var(--primary);
  font-weight: 500;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.hero h1 {
  font-size: 48px;
  font-weight: 800;
  line-height: 1.2;
  color: var(--text-primary);
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.hero h1 .highlight {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-top: 40px;
}

.stat-item {
  text-align: center;
}

.stat-value {
  font-size: 28px;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
}

.stat-label {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ===== 翻译工具区 ===== */
.translate-section {
  max-width: 860px;
  margin: -24px auto 0;
  padding: 0 24px 48px;
  position: relative;
  z-index: 10;
}

.translate-card {
  background: white;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
  overflow: hidden;
}

.translate-card-header {
  padding: 20px 28px 16px;
  border-bottom: 1px solid var(--border-light);
  background: var(--bg-light);
}

.translate-card-header h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.format-tags {
  display: flex;
  gap: 8px;
  margin-top: 8px;
  flex-wrap: wrap;
}

.format-tag {
  padding: 3px 10px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
}

.translate-card-body {
  padding: 24px 28px;
}

/* 文件上传区 */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius-md);
  padding: 40px 24px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  background: var(--bg-light);
  position: relative;
}

.upload-zone:hover, .upload-zone.drag-over {
  border-color: var(--primary);
  background: var(--primary-light);
}

.upload-zone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%;
  height: 100%;
}

.upload-icon {
  font-size: 40px;
  margin-bottom: 12px;
  display: block;
}

.upload-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.upload-subtitle {
  font-size: 13px;
  color: var(--text-muted);
}

.upload-hint {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 8px;
}

/* 文件已选中状态 */
.file-selected {
  display: none;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--primary-light);
  border-radius: var(--radius-md);
  border: 1px solid #c7d7f9;
  margin-top: 12px;
}

.file-selected.show { display: flex; }

.file-icon { font-size: 24px; }

.file-info { flex: 1; }

.file-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

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

.file-remove {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 18px;
  padding: 4px;
  border-radius: 4px;
  transition: all 0.2s;
}

.file-remove:hover { color: #ef4444; background: #fee2e2; }

/* 语言选择 */
.lang-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 20px;
}

.lang-select-wrap {
  flex: 1;
}

.lang-select-wrap label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  display: block;
  margin-bottom: 6px;
}

.lang-select {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--text-primary);
  background: white;
  cursor: pointer;
  transition: border-color 0.2s;
  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='%236b7280' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
}

.lang-select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26,86,219,0.1);
}

.lang-arrow {
  font-size: 20px;
  color: var(--text-muted);
  flex-shrink: 0;
  margin-top: 20px;
}

/* 翻译按钮 */
.translate-btn-wrap {
  margin-top: 20px;
}

.translate-btn {
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.translate-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(26,86,219,0.35);
}

.translate-btn:disabled {
  background: var(--border);
  color: var(--text-muted);
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

/* 进度条 */
.progress-wrap {
  display: none;
  margin-top: 16px;
}

.progress-wrap.show { display: block; }

.progress-label {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.progress-bar {
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 3px;
  transition: width 0.3s ease;
  width: 0%;
}

/* 结果区 */
.result-wrap {
  display: none;
  margin-top: 16px;
  padding: 16px;
  background: #f0fdf4;
  border: 1px solid #86efac;
  border-radius: var(--radius-md);
}

.result-wrap.show { display: block; }

.result-title {
  font-size: 14px;
  font-weight: 700;
  color: #166534;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: #16a34a;
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

.download-btn:hover { background: #15803d; }

.progress-hint {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 8px;
  text-align: center;
}

.result-stats {
  font-size: 12px;
  color: #166534;
  margin-bottom: 10px;
  opacity: 0.8;
}

.loading-state {
  text-align: center;
  padding: 20px;
  color: var(--text-muted);
  font-size: 14px;
}

.history-download-btn {
  display: inline-flex;
  align-items: center;
  padding: 5px 12px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.2s;
}

.history-download-btn:hover { background: var(--primary-dark); }

.history-action {
  flex-shrink: 0;
  margin-left: 12px;
}

/* ===== 功能特点区 ===== */
.features-section {
  padding: 64px 40px;
  background: var(--bg-white);
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-title {
  font-size: 32px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.section-desc {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 500px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 1000px;
  margin: 0 auto;
}

.feature-card {
  padding: 28px 24px;
  background: var(--bg-light);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  transition: all 0.2s;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: #c7d7f9;
  background: white;
}

.feature-icon {
  font-size: 32px;
  margin-bottom: 16px;
  display: block;
}

.feature-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.feature-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===== 定价区 ===== */
.pricing-section {
  padding: 64px 40px;
  background: var(--bg-section);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 900px;
  margin: 0 auto;
}

.pricing-card {
  background: white;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  padding: 32px 28px;
  text-align: center;
  position: relative;
  transition: all 0.2s;
}

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

.pricing-card.featured {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(26,86,219,0.15);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  padding: 4px 16px;
  background: var(--primary);
  color: white;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 700;
  white-space: nowrap;
}

.pricing-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.pricing-price {
  font-size: 36px;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 4px;
}

.pricing-price span {
  font-size: 16px;
  font-weight: 500;
  color: var(--text-secondary);
}

.pricing-tokens {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.pricing-features {
  list-style: none;
  text-align: left;
  margin-bottom: 24px;
}

.pricing-features li {
  font-size: 14px;
  color: var(--text-secondary);
  padding: 6px 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.pricing-features li::before {
  content: "✓";
  color: var(--primary);
  font-weight: 700;
  flex-shrink: 0;
}

/* ===== FAQ 区 ===== */
.faq-section {
  padding: 64px 40px;
  background: var(--bg-white);
}

.faq-list {
  max-width: 720px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-question {
  width: 100%;
  padding: 18px 20px;
  background: none;
  border: none;
  text-align: left;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background 0.2s;
}

.faq-question:hover { background: var(--bg-light); }

.faq-arrow {
  font-size: 18px;
  color: var(--text-muted);
  transition: transform 0.2s;
  flex-shrink: 0;
}

.faq-item.open .faq-arrow { transform: rotate(180deg); }

.faq-answer {
  display: none;
  padding: 0 20px 18px;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  border-top: 1px solid var(--border-light);
}

.faq-item.open .faq-answer { display: block; }

/* ===== 底部 ===== */
.footer {
  background: #111827;
  color: #9ca3af;
  padding: 48px 40px 32px;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 40px;
  gap: 40px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
  color: white;
  margin-bottom: 12px;
}

.footer-brand img {
  height: 28px;
  width: auto;
  object-fit: contain;
}

.footer-tagline {
  font-size: 13px;
  color: #6b7280;
  max-width: 260px;
  line-height: 1.6;
}

.footer-links {
  display: flex;
  gap: 48px;
}

.footer-col h4 {
  font-size: 13px;
  font-weight: 700;
  color: white;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 16px;
}

.footer-col a {
  display: block;
  font-size: 14px;
  color: #6b7280;
  margin-bottom: 10px;
  transition: color 0.2s;
}

.footer-col a:hover { color: white; }

.footer-bottom {
  border-top: 1px solid #1f2937;
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom-links {
  display: flex;
  gap: 20px;
}

.footer-bottom-links a {
  color: #6b7280;
  transition: color 0.2s;
}

.footer-bottom-links a:hover { color: white; }

/* ===== 弹窗 ===== */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-overlay.show { display: flex; }

.modal {
  background: white;
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 440px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  animation: modalIn 0.2s ease;
}

@keyframes modalIn {
  from { opacity: 0; transform: scale(0.95) translateY(-10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-header {
  padding: 28px 28px 0;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.modal-title {
  font-size: 22px;
  font-weight: 800;
  color: var(--text-primary);
}

.modal-subtitle {
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 4px;
}

.modal-close {
  background: none;
  border: none;
  font-size: 22px;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  line-height: 1;
  transition: all 0.2s;
}

.modal-close:hover { color: var(--text-primary); background: var(--bg-section); }

.modal-body {
  padding: 24px 28px 28px;
}

.modal-tabs {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--border);
  margin-bottom: 24px;
}

.modal-tab {
  padding: 10px 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all 0.2s;
  background: none;
  border-top: none;
  border-left: none;
  border-right: none;
}

.modal-tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.form-input {
  width: 100%;
  padding: 11px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--text-primary);
  transition: border-color 0.2s;
  background: white;
}

.form-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26,86,219,0.1);
}

.form-submit {
  width: 100%;
  padding: 13px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
  margin-top: 8px;
}

.form-submit:hover { background: var(--primary-dark); }

.form-error {
  color: #ef4444;
  font-size: 13px;
  margin-top: 8px;
  display: none;
}

.form-error.show { display: block; }

.form-switch {
  text-align: center;
  margin-top: 16px;
  font-size: 14px;
  color: var(--text-secondary);
}

.form-switch a {
  color: var(--primary);
  font-weight: 600;
  cursor: pointer;
}

/* ===== 用户中心 ===== */
.dashboard {
  max-width: 1000px;
  margin: 0 auto;
  padding: 40px 24px;
}

.dashboard-header {
  margin-bottom: 32px;
}

.dashboard-title {
  font-size: 28px;
  font-weight: 800;
  color: var(--text-primary);
}

.dashboard-subtitle {
  font-size: 15px;
  color: var(--text-secondary);
  margin-top: 4px;
}

.quota-card {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: var(--radius-lg);
  padding: 28px;
  color: white;
  margin-bottom: 32px;
}

.quota-label {
  font-size: 14px;
  opacity: 0.85;
  margin-bottom: 8px;
}

.quota-value {
  font-size: 36px;
  font-weight: 800;
  line-height: 1;
  margin-bottom: 12px;
}

.quota-bar {
  height: 8px;
  background: rgba(255,255,255,0.3);
  border-radius: 4px;
  overflow: hidden;
}

.quota-fill {
  height: 100%;
  background: white;
  border-radius: 4px;
  transition: width 0.5s ease;
}

.quota-meta {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  opacity: 0.8;
  margin-top: 8px;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.dash-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.dash-card-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.history-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-light);
}

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

.history-icon { font-size: 20px; }

.history-info { flex: 1; }

.history-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.history-meta {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}

.status-badge {
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
}

.status-done { background: #dcfce7; color: #166534; }
.status-processing { background: #fef9c3; color: #854d0e; }
.status-failed { background: #fee2e2; color: #991b1b; }

.empty-state {
  text-align: center;
  padding: 32px;
  color: var(--text-muted);
}

.empty-state-icon { font-size: 40px; margin-bottom: 12px; }
.empty-state-text { font-size: 14px; }

/* ===== Toast 通知 ===== */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  padding: 14px 20px;
  background: #111827;
  color: white;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  z-index: 9999;
  display: none;
  align-items: center;
  gap: 10px;
  max-width: 360px;
  animation: toastIn 0.3s ease;
}

.toast.show { display: flex; }
.toast.success { background: #166534; }
.toast.error { background: #991b1b; }

@keyframes toastIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .navbar { padding: 0 16px; }
  .navbar-nav { display: none; }
  .hero { padding: 40px 16px 32px; }
  .hero h1 { font-size: 32px; }
  .hero-stats { gap: 24px; }
  .translate-section { padding: 0 12px 32px; }
  .features-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  .footer-top { flex-direction: column; }
  .footer-links { flex-direction: column; gap: 24px; }
  .dashboard-grid { grid-template-columns: 1fr; }
}

/* ===== 加载动画 ===== */
.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  display: none;
}

.spinner.show { display: inline-block; }

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

/* ===== 页面切换 ===== */
.page { display: none; }
.page.active { display: block; }