/* ============================================================
   浙江工商大学 学术论文自动排版工具 - 样式表
   设计风格：深色主题 + 校色(商务蓝/橄榄绿) + 玻璃态 + 微动效
   ============================================================ */

/* ====== CSS 变量 ====== */
:root {
  /* 主色调 — 浙工商校徽：商务蓝 */
  --primary-h: 215;
  --primary-s: 60%;
  --primary-l: 40%;
  --primary: hsl(var(--primary-h), var(--primary-s), var(--primary-l));
  --primary-light: hsl(var(--primary-h), 70%, 55%);
  --primary-dark: hsl(var(--primary-h), 70%, 25%);
  --primary-glow: hsla(var(--primary-h), 80%, 50%, 0.3);

  /* 强调色 — 校徽橄榄绿 */
  --accent: hsl(85, 50%, 45%);
  --accent-glow: hsla(85, 50%, 45%, 0.3);

  /* 中性色 — 深蓝/灰背景 */
  --bg-deep: #080c14;
  --bg-base: #0c121e;
  --bg-surface: rgba(15, 25, 40, 0.7);
  --bg-card: rgba(20, 35, 55, 0.5);
  --bg-card-hover: rgba(30, 45, 70, 0.6);

  --border: rgba(100, 140, 200, 0.15);
  --border-hover: rgba(120, 160, 220, 0.3);

  --text-primary: #e8ecf4;
  --text-secondary: #8b95b0;
  --text-muted: #5a6480;

  /* 状态色 */
  --success: hsl(145, 65%, 48%);
  --success-glow: hsla(145, 65%, 48%, 0.3);
  --error: hsl(0, 72%, 58%);
  --error-glow: hsla(0, 72%, 58%, 0.3);
  --warning: hsl(38, 92%, 55%);

  /* 间距 */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  /* 圆角 */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* 字体 */
  --font-sans: 'Noto Sans SC', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', monospace;
  --font-signature: 'Caveat', 'Segoe Script', cursive;

  /* 过渡 */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ====== 基础重置 ====== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-deep) url('/static/bg.png') no-repeat center center fixed;
  background-size: cover;
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* ====== 动态背景粒子与图片蒙版 ====== */
.bg-particles {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
  background: linear-gradient(to bottom, rgba(8, 12, 20, 0.5), rgba(8, 12, 20, 0.85));
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.bg-particles::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background:
    radial-gradient(ellipse 600px 600px at 20% 30%, hsla(215, 80%, 40%, 0.1), transparent),
    radial-gradient(ellipse 500px 500px at 80% 20%, hsla(85, 50%, 45%, 0.06), transparent),
    radial-gradient(ellipse 700px 700px at 60% 80%, hsla(215, 60%, 30%, 0.08), transparent);
  animation: bgDrift 25s ease-in-out infinite alternate;
}

@keyframes bgDrift {
  0% { transform: translate(0, 0) rotate(0deg); }
  100% { transform: translate(-3%, 2%) rotate(3deg); }
}

.particle {
  position: absolute;
  width: 3px;
  height: 3px;
  background: var(--primary-light);
  border-radius: 50%;
  opacity: 0;
  animation: particleFloat linear infinite;
}

@keyframes particleFloat {
  0% { opacity: 0; transform: translateY(100vh) scale(0); }
  10% { opacity: 0.6; }
  90% { opacity: 0.6; }
  100% { opacity: 0; transform: translateY(-10vh) scale(1); }
}

/* ====== 主容器 ====== */
.app-container {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* ====== 顶部 Header ====== */
.app-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
  animation: fadeInDown 0.8s var(--ease-out) both;
}

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

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-sm);
}

.logo-icon {
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  box-shadow:
    0 4px 20px var(--primary-glow),
    0 0 40px var(--primary-glow);
  animation: iconPulse 3s ease-in-out infinite;
}

@keyframes iconPulse {
  0%, 100% { box-shadow: 0 4px 20px var(--primary-glow), 0 0 40px var(--primary-glow); }
  50% { box-shadow: 0 4px 30px var(--primary-glow), 0 0 60px var(--primary-glow); }
}

.logo-text {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.logo-text span {
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header-subtitle {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 400;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-xs);
}

.header-tagline {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 300;
  letter-spacing: 0.03em;
}

/* ====== 校徽标识 ====== */
.university-badge {
  margin-bottom: var(--space-lg);
  display: flex;
  justify-content: center;
}

.school-logo-img {
  width: 90px;
  height: 90px;
  object-fit: contain;
  filter: drop-shadow(0 4px 15px rgba(0, 0, 0, 0.3));
  transition: transform 0.4s var(--ease-spring);
}

.school-logo-img:hover {
  transform: scale(1.05);
}

/* ====== 输入模式选项卡 ====== */
.input-tabs {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
  background: var(--bg-card);
  padding: 6px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border);
}

.tab-btn {
  flex: 1;
  padding: var(--space-sm) var(--space-md);
  background: transparent;
  border: none;
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s;
}

.tab-btn.active {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  box-shadow: 0 4px 15px var(--primary-glow);
}

/* ====== 黏贴文本区域 ====== */
.paste-section {
  width: 100%;
  animation: fadeInUp 0.8s var(--ease-out) 0.2s both;
}

.paste-area {
  width: 100%;
  height: 280px;
  padding: var(--space-md);
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  line-height: 1.6;
  resize: vertical;
  margin-bottom: var(--space-md);
  outline: none;
  transition: all 0.3s;
}

.paste-area:focus {
  border-color: var(--primary-light);
  box-shadow: 0 0 20px var(--primary-glow);
  background: var(--bg-card-hover);
}

.paste-area::placeholder {
  color: var(--text-muted);
}

/* ====== 上传区域 ====== */
.upload-section {
  width: 100%;
  animation: fadeInUp 0.8s var(--ease-out) 0.2s both;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-3xl) var(--space-xl);
  text-align: center;
  cursor: pointer;
  transition: all 0.4s var(--ease-out);
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  position: relative;
  overflow: hidden;
}

.upload-zone::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 50%, var(--primary-glow), transparent 70%);
  opacity: 0;
  transition: opacity 0.4s ease;
}

.upload-zone:hover,
.upload-zone.drag-over {
  border-color: var(--primary-light);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.3), 0 0 30px var(--primary-glow);
}

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

.upload-zone.drag-over {
  border-color: var(--accent);
  box-shadow: 0 0 40px var(--accent-glow);
}

.upload-icon {
  color: var(--text-muted);
  margin-bottom: var(--space-lg);
  transition: color 0.3s, transform 0.3s;
  position: relative;
  z-index: 1;
}

.upload-zone:hover .upload-icon {
  color: var(--primary-light);
  transform: translateY(-4px);
}

.upload-zone.drag-over .upload-icon {
  color: var(--accent);
  transform: translateY(-8px) scale(1.1);
}

.upload-title {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
  position: relative;
  z-index: 1;
}

.upload-hint {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
  position: relative;
  z-index: 1;
}

.upload-format {
  font-size: 0.8rem;
  color: var(--text-muted);
  position: relative;
  z-index: 1;
}

.upload-format strong {
  color: var(--primary-light);
}

/* ====== 文件预览 ====== */
.file-preview {
  width: 100%;
  animation: fadeInUp 0.5s var(--ease-out) both;
}

.file-card {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-lg) var(--space-xl);
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-lg);
}

.file-icon-wrapper {
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, hsla(350, 70%, 50%, 0.2), hsla(350, 70%, 50%, 0.05));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-light);
  flex-shrink: 0;
}

.file-info {
  flex: 1;
  min-width: 0;
}

.file-name {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-size {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

.file-remove {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s ease;
  flex-shrink: 0;
}

.file-remove:hover {
  color: var(--error);
  border-color: var(--error);
  background: hsla(0, 72%, 58%, 0.1);
}

/* ====== 按钮 ====== */
.btn-format {
  width: 100%;
  padding: var(--space-md) var(--space-xl);
  font-size: 1rem;
  font-weight: 600;
  font-family: var(--font-sans);
  color: white;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  transition: all 0.3s var(--ease-out);
  position: relative;
  overflow: hidden;
}

.btn-format::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  transform: translateX(-100%);
  transition: transform 0.6s ease;
}

.btn-format:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--primary-glow);
}

.btn-format:hover::before {
  transform: translateX(100%);
}

.btn-format:active {
  transform: translateY(0);
}

.btn-download {
  width: 100%;
  padding: var(--space-md) var(--space-xl);
  font-size: 1rem;
  font-weight: 600;
  font-family: var(--font-sans);
  color: white;
  background: linear-gradient(135deg, var(--success), hsl(145, 65%, 38%));
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  transition: all 0.3s var(--ease-out);
  margin-bottom: var(--space-md);
}

.btn-download:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--success-glow);
}

.btn-reset {
  padding: var(--space-sm) var(--space-lg);
  font-size: 0.85rem;
  font-weight: 500;
  font-family: var(--font-sans);
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  transition: all 0.2s ease;
}

.btn-reset:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
  background: var(--bg-card);
}

/* ====== 处理中动画 ====== */
.processing-section {
  width: 100%;
  animation: fadeInUp 0.5s var(--ease-out) both;
}

.processing-card {
  text-align: center;
  padding: var(--space-2xl) var(--space-xl);
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
}

.spinner {
  width: 56px;
  height: 56px;
  margin: 0 auto var(--space-lg);
  border: 3px solid var(--border);
  border-top-color: var(--primary-light);
  border-right-color: var(--accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

.processing-title {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.processing-hint {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
}

.processing-steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  align-items: flex-start;
  max-width: 260px;
  margin: 0 auto;
}

.step {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: color 0.3s ease;
}

.step.active {
  color: var(--primary-light);
}

.step.done {
  color: var(--success);
}

.step-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: all 0.3s ease;
  flex-shrink: 0;
}

.step.active .step-dot {
  background: var(--primary-light);
  box-shadow: 0 0 10px var(--primary-glow);
  animation: dotPulse 1.2s ease-in-out infinite;
}

.step.done .step-dot {
  background: var(--success);
  box-shadow: 0 0 8px var(--success-glow);
}

@keyframes dotPulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.4); opacity: 0.7; }
}

/* ====== 结果区域 ====== */
.result-section {
  width: 100%;
  animation: fadeInUp 0.5s var(--ease-out) both;
}

.result-card {
  text-align: center;
  padding: var(--space-2xl) var(--space-xl);
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  position: relative;
  overflow: hidden;
}

.result-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 30%, var(--success-glow), transparent 60%);
  opacity: 0.5;
}

.result-icon {
  color: var(--success);
  margin-bottom: var(--space-md);
  position: relative;
  z-index: 1;
  animation: scaleIn 0.5s var(--ease-spring) both;
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.5); }
  to { opacity: 1; transform: scale(1); }
}

.result-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: var(--space-lg);
  position: relative;
  z-index: 1;
}

.result-stats {
  display: flex;
  gap: var(--space-lg);
  justify-content: center;
  margin-bottom: var(--space-xl);
  position: relative;
  z-index: 1;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.stat-value {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  font-family: var(--font-mono);
}

.result-card .btn-download,
.result-card .btn-reset {
  position: relative;
  z-index: 1;
}

/* ====== 错误区域 ====== */
.error-section {
  width: 100%;
  animation: fadeInUp 0.5s var(--ease-out) both;
}

.error-card {
  text-align: center;
  padding: var(--space-2xl) var(--space-xl);
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid hsla(0, 72%, 58%, 0.2);
  border-radius: var(--radius-xl);
}

.error-icon {
  color: var(--error);
  margin-bottom: var(--space-md);
}

.error-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--error);
  margin-bottom: var(--space-sm);
}

.error-message {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
  line-height: 1.6;
}

/* ====== 排版规则说明 ====== */
.rules-section {
  width: 100%;
  margin-top: var(--space-3xl);
  animation: fadeInUp 0.8s var(--ease-out) 0.4s both;
}

.rules-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  text-align: center;
  margin-bottom: var(--space-xl);
  position: relative;
}

.rules-title::after {
  content: '';
  display: block;
  width: 40px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: var(--radius-full);
  margin: var(--space-sm) auto 0;
}

.rules-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.rule-card {
  padding: var(--space-lg);
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all 0.3s var(--ease-out);
}

.rule-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
}

.rule-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
  font-family: var(--font-mono);
}

.rule-icon-body {
  background: linear-gradient(135deg, hsla(215, 70%, 50%, 0.2), hsla(215, 70%, 50%, 0.05));
  color: var(--primary-light);
}

.rule-icon-h1 {
  background: linear-gradient(135deg, hsla(230, 60%, 50%, 0.2), hsla(230, 60%, 50%, 0.05));
  color: hsl(230, 60%, 65%);
}

.rule-icon-h2 {
  background: linear-gradient(135deg, hsla(190, 70%, 50%, 0.2), hsla(190, 70%, 50%, 0.05));
  color: hsl(190, 70%, 65%);
}

.rule-icon-fig {
  background: linear-gradient(135deg, hsla(85, 50%, 45%, 0.2), hsla(85, 50%, 45%, 0.05));
  color: var(--accent);
}

.rule-card h3 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.rule-card p {
  font-size: 0.78rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ====== 页脚 ====== */
.app-footer {
  margin-top: var(--space-3xl);
  padding: var(--space-lg) 0;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.app-footer p:first-child {
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: 4px;
}

.footer-sub {
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.03em;
}

.footer-github {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: var(--space-sm);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.78rem;
  transition: all 0.3s;
}

.footer-github:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
  background: var(--bg-card);
}

.footer-signature {
  margin-top: var(--space-md);
  padding: 0;
  display: inline-flex;
  align-items: flex-end;
  gap: 10px;
}

.sign-label {
  font-size: 0.68rem;
  color: var(--text-muted);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  transform: translateY(-1px);
}

.sign-name {
  font-family: var(--font-signature);
  font-size: 1.55rem;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.04em;
  color: #aeb6ff;
  position: relative;
  display: inline-block;
  white-space: nowrap;
  padding-bottom: 3px;
  min-width: 4.8ch;
}

.sign-name::after {
  content: '|';
  color: #667eea;
  font-weight: 300;
  margin-left: 1px;
  animation: cursorBlink 0.7s steps(1) infinite;
}

.sign-name.typed::after {
  animation: cursorBlink 0.7s steps(1) 3, cursorHide 0s linear 2.1s forwards;
}

.sign-name .sign-underline {
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 1.5px;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, #667eea, var(--accent));
  box-shadow: 0 0 12px rgba(102, 126, 234, 0.35);
}

.sign-name.typed .sign-underline {
  animation: underlineGrow 0.8s ease-out forwards;
}

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

@keyframes cursorHide {
  to { opacity: 0; }
}

@keyframes underlineGrow {
  from { width: 0; }
  to { width: 100%; }
}

/* ====== 工具类 ====== */
.hidden {
  display: none !important;
}

/* ====== 响应式 — 平板 ====== */
@media (max-width: 768px) {
  .app-container {
    padding: var(--space-lg) var(--space-md);
  }

  .rules-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-sm);
  }
}

/* ====== 响应式 — 手机 ====== */
@media (max-width: 480px) {
  :root {
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 14px;
    --space-lg: 20px;
    --space-xl: 28px;
    --space-2xl: 36px;
    --space-3xl: 48px;
  }

  .app-container {
    padding: var(--space-md) var(--space-sm);
    max-width: 100%;
  }

  /* 校徽缩小 */
  .school-logo-img {
    width: 64px;
    height: 64px;
  }

  /* Header */
  .app-header {
    margin-bottom: var(--space-lg);
  }

  .logo {
    gap: var(--space-sm);
    flex-direction: column;
  }

  .logo-icon {
    width: 42px;
    height: 42px;
  }

  .logo-icon svg {
    width: 22px;
    height: 22px;
  }

  .logo-text {
    font-size: 1.15rem;
    text-align: center;
  }

  .header-subtitle {
    font-size: 0.82rem;
  }

  .header-tagline {
    font-size: 0.72rem;
  }

  /* 选项卡 */
  .input-tabs {
    padding: 4px;
    gap: 4px;
  }

  .tab-btn {
    padding: var(--space-xs) var(--space-sm);
    font-size: 0.85rem;
  }

  /* 上传区域 */
  .upload-zone {
    padding: var(--space-xl) var(--space-sm);
    border-radius: var(--radius-lg);
  }

  .upload-icon-wrapper {
    width: 56px;
    height: 56px;
  }

  .upload-title {
    font-size: 1rem;
  }

  .upload-hint,
  .upload-format {
    font-size: 0.75rem;
  }

  /* 文本粘贴区域 */
  .paste-area {
    height: 200px;
    font-size: 0.85rem;
    border-radius: var(--radius-lg);
    padding: var(--space-sm);
  }

  /* 文件预览卡 */
  .file-card {
    padding: var(--space-sm);
    border-radius: var(--radius-lg);
    gap: var(--space-sm);
  }

  .file-icon-wrapper {
    width: 42px;
    height: 42px;
  }

  .file-info h3 {
    font-size: 0.88rem;
  }

  .file-info p {
    font-size: 0.72rem;
  }

  .file-remove {
    width: 28px;
    height: 28px;
  }

  /* 按钮 */
  .btn-format {
    padding: var(--space-sm) var(--space-lg);
    font-size: 0.9rem;
    border-radius: var(--radius-lg);
  }

  /* 处理步骤 */
  .processing-card {
    padding: var(--space-md);
    border-radius: var(--radius-lg);
  }

  .step-item {
    gap: var(--space-sm);
    padding: var(--space-sm) 0;
  }

  .step-icon {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
  }

  .step-label {
    font-size: 0.82rem;
  }

  /* 结果 */
  .result-card {
    padding: var(--space-md);
    border-radius: var(--radius-lg);
  }

  .result-stats {
    flex-direction: column;
    gap: var(--space-xs);
  }

  .stat-card {
    padding: var(--space-sm);
  }

  .stat-value {
    font-size: 1rem;
  }

  .stat-label {
    font-size: 0.7rem;
  }

  .btn-download {
    padding: var(--space-sm) var(--space-lg);
    font-size: 0.9rem;
  }

  .btn-reset {
    font-size: 0.82rem;
    padding: var(--space-xs) var(--space-md);
  }

  /* 排版规范区 */
  .rules-section h2 {
    font-size: 1rem;
  }

  .rules-grid {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }

  .rule-card {
    padding: var(--space-sm);
  }

  .rule-icon {
    width: 36px;
    height: 36px;
    font-size: 0.75rem;
  }

  .rule-card h3 {
    font-size: 0.82rem;
  }

  .rule-card p {
    font-size: 0.72rem;
  }

  /* 页脚 */
  .app-footer {
    margin-top: var(--space-xl);
    font-size: 0.7rem;
  }

  .footer-sub {
    font-size: 0.65rem;
  }

  .footer-signature {
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 0;
  }

  .sign-name {
    font-size: 1.4rem;
  }

  /* 减少粒子数量/尺寸以提升手机性能 */
  .particle {
    opacity: 0.1 !important;
  }
}