:root {
  --bg: #ffffff;
  --fg: #000000;
  --muted: #666666;
  --muted-light: #999999;
  --border: #e0e0e0;
  --card: #ffffff;
  --card-shadow: rgba(0, 0, 0, 0.04);
  --brand: #000000;
  --brand-contrast: #ffffff;
  --brand-light: #f5f5f5;
  --surface: #fafafa;
  --accent: #ff0000;
  --success: #000000;
  --warning: #000000;
}

:root[data-theme='dark'] {
  --bg: #000000;
  --fg: #ffffff;
  --muted: #a0a0a0;
  --muted-light: #666666;
  --border: #222222;
  --card: #0a0a0a;
  --card-shadow: rgba(255, 255, 255, 0.05);
  --brand: #ffffff;
  --brand-contrast: #000000;
  --brand-light: #111111;
  --surface: #111111;
  --accent: #ff3333;
  --success: #ffffff;
  --warning: #ffffff;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: 'Inter', 'Helvetica Neue', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.5;
  letter-spacing: -0.01em;
  font-weight: 400;
  position: relative;
}

.container { max-width: 1024px; margin: 0 auto; padding: 0 20px; }

/* 简约杂志风格头部 */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  transition: all 0.2s ease;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

:root[data-theme='dark'] .site-header { 
  background: rgba(0, 0, 0, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 3px rgba(255, 255, 255, 0.1);
}
.site-header .container { display: flex; align-items: center; justify-content: space-between; height: 72px; }

.site-title { 
  margin: 0; 
  font-size: 24px; 
  font-weight: 900; 
  letter-spacing: -0.03em; 
  text-transform: uppercase;
  color: var(--fg);
}

.site-title a { 
  color: inherit; 
  text-decoration: none;
  transition: color 0.2s ease;
}

.site-title a:hover {
  color: var(--accent);
}

/* Mobile menu toggle */
.mobile-menu-toggle {
  display: none;
  background: none;
  border: 1px solid transparent;
  font-size: 20px;
  color: var(--fg);
  cursor: pointer;
  padding: 8px;
  transition: all 0.2s ease;
}

.mobile-menu-toggle:hover {
  background: var(--surface);
  border-color: var(--border);
}

:root[data-theme='dark'] .mobile-menu-toggle:hover {
  background: var(--surface);
  border-color: var(--border);
}

.nav { 
  display: flex; 
  gap: 4px; 
  align-items: center; 
  flex-wrap: wrap; 
}

.nav a { 
  color: var(--muted); 
  text-decoration: none; 
  padding: 10px 16px; 
  border: 1px solid transparent; 
  font-weight: 500;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.nav a.btn {
  color: var(--brand-contrast) !important;
  background: var(--brand);
  border-color: var(--brand);
}

.nav a:hover { 
  color: var(--fg); 
  border-color: var(--fg); 
  background: transparent;
}

.nav a.btn:hover {
  background: transparent;
  color: var(--brand) !important;
}

.nav a.active { 
  color: var(--brand-contrast); 
  border-color: var(--brand); 
  background: var(--brand); 
  font-weight: 600;
}

:root[data-theme='dark'] .nav a:hover {
  color: var(--fg);
  border-color: var(--fg);
  background: transparent;
}

:root[data-theme='dark'] .nav a.btn {
  background: var(--brand);
  color: var(--brand-contrast) !important;
}

:root[data-theme='dark'] .nav a.btn:hover {
  background: transparent;
  color: var(--brand) !important;
  border-color: var(--brand);
}

/* 简约杂志风格按钮 */
.btn, .btn-ghost {
  appearance: none; 
  border: 2px solid var(--brand); 
  background: var(--brand); 
  color: var(--brand-contrast);
  padding: 12px 24px; 
  border-radius: 0; 
  cursor: pointer; 
  font-weight: 600; 
  text-decoration: none; 
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: all 0.2s ease;
  position: relative;
}

.btn:hover {
  background: transparent;
  color: var(--brand);
}

:root[data-theme='dark'] .btn {
  border-color: var(--brand);
  background: var(--brand);
  color: var(--brand-contrast);
}

:root[data-theme='dark'] .btn:hover {
  background: transparent;
  color: var(--brand);
}
.btn.secondary { 
  background: transparent; 
  color: var(--fg); 
  border-color: var(--fg);
}
.btn.secondary:hover {
  background: var(--fg);
  color: var(--bg);
}
.btn-ghost { 
  border-color: var(--border); 
  background: transparent; 
  color: var(--muted); 
}

.btn-ghost:hover { 
  color: var(--fg); 
  border-color: var(--fg); 
  background: transparent;
}

:root[data-theme='dark'] .btn-ghost {
  border-color: var(--border);
  color: var(--muted);
}

:root[data-theme='dark'] .btn-ghost:hover {
  color: var(--fg);
  border-color: var(--fg);
}

/* 主题切换按钮优化 */
#toggle-theme {
  font-size: 16px;
  padding: 8px 12px;
  border-radius: 0;
  transition: all 0.2s ease;
}

#toggle-theme:hover {
  background: var(--surface);
  border-color: var(--border);
  transform: scale(1.1);
}

:root[data-theme='dark'] #toggle-theme {
  color: var(--muted);
  border-color: var(--border);
}

:root[data-theme='dark'] #toggle-theme:hover {
  color: var(--fg);
  border-color: var(--fg);
  background: var(--surface);
}

/* 符合全局风格的hero区域 */
.hero { 
  padding: 80px 0 60px; 
  text-align: left; 
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  margin: 0;
  position: relative;
}


.hero h2 { 
  margin: 0 0 24px; 
  font-size: clamp(32px, 8vw, 48px); 
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--fg);
  line-height: 1.2;
  text-transform: uppercase;
}

.hero p { 
  margin: 0 0 40px 0; 
  color: var(--muted); 
  font-size: 18px;
  max-width: 600px;
  line-height: 1.6;
  font-weight: 400;
}
.actions { 
  display: flex; 
  gap: 16px; 
  flex-wrap: wrap; 
  justify-content: flex-start;
  align-items: center;
  margin-top: 8px;
}

.grid { 
  display: grid; 
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); 
  gap: 24px; 
  padding: 60px 0 80px; 
  margin-top: 40px;
}
/* 简约杂志风格卡片 */
.card { 
  background: var(--card); 
  border: 1px solid var(--border); 
  border-radius: 0; 
  padding: 32px; 
  transition: all 0.2s ease;
  position: relative;
}

.card:hover { 
  border-color: var(--fg);
  box-shadow: 0 4px 20px var(--card-shadow);
}
.card h3 { 
  margin: 0 0 16px 0; 
  font-size: 24px;
  font-weight: 700;
  color: var(--fg);
  letter-spacing: -0.02em;
  text-transform: uppercase;
}
.card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
  font-weight: 300;
}

.prose { padding: 28px 0; }
.prose h2, .prose h3 { line-height: 1.35; }
.prose h2 { margin-top: 0; }
.prose p, .prose li { color: var(--fg); }
.prose a { color: var(--brand); }
.prose ul { padding-left: 20px; }

.site-footer { border-top: 1px solid var(--border); padding: 20px 0; margin-top: 20px; }
.back-link { display: inline-block; margin-bottom: 8px; color: var(--muted); text-decoration: none; }
.back-link:hover { color: var(--fg); }

/* 黑白杂志风格应用截图 */
.gallery-section {
  padding: 80px 0;
  background: var(--bg);
  margin: 60px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.gallery-section h2 {
  text-align: left;
  margin: 0 0 48px 0;
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--fg);
  text-transform: uppercase;
  position: relative;
}

.gallery-section h2::after {
  content: '';
  position: absolute;
  bottom: -12px;
  left: 0;
  width: 60px;
  height: 2px;
  background: var(--fg);
}

.gallery-container {
  position: relative;
  max-width: 100%;
  margin: 0;
  border: 2px solid var(--border);
  background: var(--card);
}

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2px;
  background: var(--border);
}

.gallery img {
  width: 100%;
  height: 300px;
  object-fit: cover;
  background: var(--bg);
  transition: all 0.3s ease;
  filter: grayscale(100%) contrast(1.2);
  border: none;
}

.gallery img:hover {
  filter: grayscale(0%) contrast(1);
  transform: scale(1.02);
  z-index: 10;
  position: relative;
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}

/* 简化的导航控件 */
.gallery-dots {
  display: flex;
  justify-content: flex-start;
  gap: 12px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.gallery-dot {
  width: 8px;
  height: 8px;
  border: 1px solid var(--border);
  background: transparent;
  cursor: pointer;
  transition: all 0.2s ease;
}

.gallery-dot.active {
  background: var(--fg);
  border-color: var(--fg);
}

.gallery-dot:hover {
  border-color: var(--fg);
}

/* 隐藏原有的导航按钮 */
.gallery-nav {
  display: none;
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }
  
  .site-header .container {
    height: 60px;
    position: relative;
  }
  
  .site-title {
    font-size: 18px;
  }
  
  /* Mobile menu toggle */
  .mobile-menu-toggle {
    display: block;
  }
  
  /* Hide navigation on mobile by default */
  .nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border);
    border-top: none;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    flex-direction: column;
    gap: 0;
    padding: 20px;
    transform: translateY(-10px);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
  }
  
  :root[data-theme='dark'] .nav {
    background: rgba(0, 0, 0, 0.98);
    backdrop-filter: blur(10px);
    border-color: var(--border);
    box-shadow: 0 8px 32px rgba(255, 255, 255, 0.1);
  }
  
  /* Show navigation when active */
  .nav.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .nav a {
    padding: 16px 20px;
    font-size: 14px;
    border: 1px solid transparent;
    width: 100%;
    text-align: left;
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 500;
  }
  
  .nav a:last-child {
    margin-bottom: 0;
  }
  
  .nav a:hover {
    border-color: var(--fg);
    background: transparent;
  }
  
  /* Special styling for download button on mobile */
  .nav a.btn {
    background: var(--brand);
    color: var(--brand-contrast) !important;
    border-color: var(--brand);
    font-weight: 600;
    margin-top: 16px;
    text-align: center;
  }
  
  .nav a.btn:hover {
    background: transparent;
    color: var(--brand) !important;
    border-color: var(--brand);
  }
  
  :root[data-theme='dark'] .nav a:hover {
    border-color: var(--fg);
    background: transparent;
  }
  
  :root[data-theme='dark'] .nav a.btn {
    background: var(--brand);
    color: var(--brand-contrast) !important;
    border-color: var(--brand);
  }
  
  :root[data-theme='dark'] .nav a.btn:hover {
    background: transparent;
    color: var(--brand) !important;
    border-color: var(--brand);
  }
  .hero {
    padding: 60px 0 50px;
    margin: 0;
    text-align: left;
  }
  .hero h2 {
    font-size: clamp(28px, 6vw, 36px);
    margin-bottom: 20px;
    line-height: 1.3;
  }
  .hero p {
    font-size: 16px;
    max-width: 100%;
    margin-bottom: 32px;
    line-height: 1.5;
  }
  .actions {
    justify-content: center;
  }
  .actions {
    gap: 12px;
  }
  .btn {
    padding: 10px 14px;
    font-size: 13px;
  }
  .grid {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 16px 0 40px;
  }
  .card {
    padding: 20px;
  }
  .gallery-section {
    padding: 60px 0;
    margin: 40px 0;
  }
  
  .gallery-section h2 {
    font-size: 28px;
    margin-bottom: 32px;
  }
  
  .gallery {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  }
  
  .gallery img {
    height: 200px;
  }
  
  /* 移动端优化 */
  .hero {
    padding: 50px 0 40px;
    text-align: left;
  }
  
  .hero h2 {
    font-size: clamp(24px, 6vw, 32px);
    margin-bottom: 20px;
    line-height: 1.3;
  }
  
  .hero p {
    font-size: 15px;
    margin-bottom: 28px;
    line-height: 1.5;
  }
  
  .actions {
    margin-top: 4px;
  }
  
  .grid {
    margin-top: 32px;
    padding: 40px 0 60px;
  }
  
  .hero::after {
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
  }
  
  .feedback-form-section {
    margin: 40px 0;
    padding: 40px 0;
  }
  
  .feedback-form-card {
    padding: 0 20px;
  }
  
  .feedback-history {
    margin: 60px 0 40px;
    padding: 0 20px;
  }
  
  .form-row {
    grid-template-columns: 1fr;
    gap: 20px;
    margin-bottom: 28px;
  }
  
  .form-group-small {
    min-width: auto;
    max-width: none;
  }
  
  .form-group {
    margin-bottom: 28px;
  }
  
  .form-input {
    font-size: 16px;
    padding: 18px 16px;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    letter-spacing: -0.01em;
  }
  
  .optional-fields {
    padding-top: 32px;
    margin-top: 32px;
  }
  
  .form-actions {
    flex-direction: column;
    gap: 12px;
    margin-top: 48px;
    padding-top: 24px;
  }
  
  .form-actions .btn {
    width: 100%;
    justify-content: center;
    padding: 16px 24px;
    font-size: 15px;
  }
  
  .section-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 24px;
  }
  
  .section-header h3 {
    font-size: 22px;
  }
  
  .section-header::after {
    width: 30px;
  }
  
  .history-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  
  .history-actions {
    justify-content: flex-start;
  }
  
  .empty-state {
    padding: 40px 20px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 12px;
  }
  
  .site-header .container {
    height: 56px;
  }
  
  .site-title {
    font-size: 16px;
  }
  
  .mobile-menu-toggle {
    font-size: 20px;
    padding: 6px;
  }
  
  .nav {
    padding: 12px;
    border-radius: 0 0 12px 12px;
  }
  
  .nav a {
    padding: 14px 16px;
    font-size: 15px;
  }
  
  .hero {
    padding: 32px 0 20px;
    margin: 12px 0;
    border-radius: 12px;
  }
  
  .hero h2 {
    font-size: 24px;
  }
  
  .hero p {
    font-size: 15px;
  }
  
  .hero {
    padding: 40px 0 30px;
  }
  
  .hero h2 {
    margin-bottom: 16px;
    line-height: 1.2;
  }
  
  .hero p {
    margin-bottom: 24px;
    line-height: 1.4;
  }
  
  .actions {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    margin-top: 0;
  }
  
  .grid {
    margin-top: 24px;
    padding: 32px 0 48px;
  }
  
  .btn {
    padding: 12px 16px;
    font-size: 14px;
  }
  
  .gallery-section {
    padding: 40px 0;
    margin: 30px 0;
  }
  
  .gallery-section h2 {
    font-size: 24px;
    margin-bottom: 24px;
  }
  
  .gallery {
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  }
  
  .gallery img {
    height: 160px;
  }
  
  /* 超小屏幕优化 */
  .feedback-form-section {
    margin: 30px 0;
    padding: 30px 0;
  }
  
  .feedback-form-card {
    padding: 0 16px;
  }
  
  .feedback-history {
    margin: 50px 0 30px;
    padding: 0 16px;
  }
  
  .hero {
    padding: 30px 0 20px;
  }
  
  .hero h2 {
    font-size: clamp(24px, 8vw, 30px);
    margin-bottom: 10px;
  }
  
  .hero p {
    font-size: 14px;
  }
  
  .form-row {
    gap: 16px;
    margin-bottom: 24px;
  }
  
  .form-group {
    margin-bottom: 24px;
  }
  
  .form-group label {
    font-size: 11px;
    margin-bottom: 8px;
  }
  
  .form-input {
    font-size: 15px;
    padding: 16px;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    letter-spacing: -0.01em;
  }
  
  .optional-fields {
    padding-top: 28px;
    margin-top: 28px;
  }
  
  .form-actions {
    margin-top: 40px;
    gap: 10px;
    padding-top: 20px;
  }
  
  .form-actions .btn {
    padding: 14px 20px;
    font-size: 14px;
  }
  
  .section-header {
    margin-bottom: 20px;
  }
  
  .section-header h3 {
    font-size: 18px;
  }
  
  .empty-state {
    padding: 30px 16px;
  }
}

/* 符合全局风格的反馈表单 */
.feedback-form-section {
  padding: 60px 0;
}


.feedback-form-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 0;
  padding: 40px;
  transition: all 0.2s ease;
  position: relative;
}

.feedback-form-card:hover {
  border-color: var(--fg);
  box-shadow: 0 4px 20px var(--card-shadow);
}

.form-row {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 32px;
  align-items: end;
  margin-bottom: 40px;
}

.form-group-small {
  min-width: 200px;
  max-width: 280px;
}

.form-group {
  margin-bottom: 32px;
  position: relative;
}

.form-group label {
  display: block;
  margin-bottom: 12px;
  font-weight: 700;
  color: var(--fg);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  position: relative;
}

/* 必填字段标识 */
.form-group label[for="feedback-title"]::before,
.form-group label[for="feedback-category"]::before,
.form-group label[for="feedback-description"]::before {
  content: '*';
  color: #e74c3c;
  font-weight: bold;
  margin-right: 4px;
}

/* 可选字段标识 */
.optional-fields .form-group label::before {
  content: '(可选) ';
  font-size: 10px;
  color: var(--muted);
  font-weight: 400;
  text-transform: none;
}

/* 标签装饰线 */
.form-group label::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 20px;
  height: 1px;
  background: var(--fg);
}

/* 可选字段标签不显示装饰线 */
.optional-fields .form-group label::after {
  display: none;
}


.form-input {
  width: 100%;
  padding: 20px 16px;
  border: 1px solid var(--border);
  border-radius: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 16px;
  font-weight: 400;
  transition: all 0.2s ease;
  line-height: 1.5;
  letter-spacing: -0.01em;
}

.form-input:hover {
  border-color: var(--muted);
}

.form-input:focus {
  outline: none;
  border-color: var(--fg);
  background: var(--card);
}

:root[data-theme='dark'] .form-input {
  box-shadow: inset 0 1px 3px rgba(255, 255, 255, 0.05);
}

:root[data-theme='dark'] .form-input:focus {
  background: var(--bg);
  box-shadow: inset 0 1px 3px rgba(255, 255, 255, 0.05), 0 0 0 3px rgba(255, 255, 255, 0.1);
}

.form-input::placeholder {
  color: var(--muted);
  font-style: italic;
  font-weight: 300;
}

select.form-input {
  padding: 20px 0;
  cursor: pointer;
}

textarea.form-input {
  resize: vertical;
  min-height: 120px;
  line-height: 1.6;
  padding: 20px 16px;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

select.form-input {
  cursor: pointer;
  background-image: url('data:image/svg+xml;charset=US-ASCII,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 4 5"><path fill="%23666" d="M2 0L0 2h4zm0 5L0 3h4z"/></svg>');
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 12px;
  padding-right: 40px;
}

:root[data-theme='dark'] select.form-input {
  background-image: url('data:image/svg+xml;charset=US-ASCII,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 4 5"><path fill="%23ccc" d="M2 0L0 2h4zm0 5L0 3h4z"/></svg>');
}

.optional-fields {
  border-top: 1px solid var(--border);
  padding-top: 32px;
  margin-top: 32px;
  position: relative;
}

.optional-fields::before {
  content: 'ADDITIONAL INFORMATION';
  position: absolute;
  top: -8px;
  left: 0;
  background: var(--bg);
  padding: 0 16px 0 0;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--fg);
}

.optional-fields .form-group {
  margin-bottom: 28px;
}

.optional-fields .form-group:last-child {
  margin-bottom: 0;
}

.form-actions {
  display: flex;
  gap: 16px;
  margin-top: 40px;
  flex-wrap: wrap;
  border-top: 1px solid var(--border);
  padding-top: 24px;
  justify-content: flex-start;
}

.submit-btn {
  background: var(--brand);
  color: var(--brand-contrast);
  border: 1px solid var(--brand);
  font-weight: 600;
  font-size: 14px;
  padding: 12px 24px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: 0;
  transition: all 0.2s ease;
  cursor: pointer;
}

.submit-btn:hover {
  background: transparent;
  color: var(--brand);
}

.submit-btn.success {
  background: var(--fg);
  color: var(--bg);
}

.save-draft-btn.success {
  background: var(--fg);
  border-color: var(--fg);
  color: var(--bg);
}

#toggle-optional {
  font-size: 14px;
  padding: 12px 20px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: 0;
  border: 1px solid var(--border);
  background: transparent;
  transition: all 0.2s ease;
  color: var(--fg);
}

#toggle-optional:hover {
  border-color: var(--fg);
  background: var(--surface);
}

#toggle-optional.active {
  background: var(--fg);
  color: var(--bg);
  border-color: var(--fg);
}

:root[data-theme='dark'] #toggle-optional.active {
  background: rgba(255, 255, 255, 0.05);
}

.feedback-history {
  padding: 60px 0;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
  position: relative;
}


.section-header h3 {
  margin: 0;
  font-size: 24px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: -0.02em;
  line-height: 1;
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
  border: 1px solid var(--border);
}

.history-item {
  padding: 24px;
  border-bottom: 1px solid var(--border);
  margin: 0;
}

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

.history-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 16px;
}

.history-type {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 18px;
}

.history-title {
  font-weight: 600;
  color: var(--fg);
  text-transform: uppercase;
  letter-spacing: -0.01em;
}

.history-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.priority-badge {
  padding: 4px 8px;
  border-radius: 0;
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  border: 1px solid;
}

.priority-low { background: transparent; color: var(--muted); border-color: var(--muted); }
.priority-medium { background: transparent; color: var(--fg); border-color: var(--fg); }
.priority-high { background: var(--accent); color: white; border-color: var(--accent); }
.priority-critical { background: var(--fg); color: var(--bg); border-color: var(--fg); }

.history-content p {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
}

.history-actions {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}

.btn-ghost.small {
  padding: 6px 12px;
  font-size: 12px;
  border-radius: 16px;
}

.btn-ghost.danger:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

.empty-state {
  text-align: center;
  padding: 80px 40px;
  color: var(--muted);
  border: 1px solid var(--border);
  position: relative;
}

.empty-state::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: repeating-linear-gradient(
    90deg,
    var(--border) 0px,
    var(--border) 10px,
    transparent 10px,
    transparent 20px
  );
}

.empty-state p {
  margin: 0;
  font-size: 14px;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* 中文字体优化 */
html[lang="zh-CN"] .hero h2 {
  font-size: clamp(32px, 6vw, 48px);
  letter-spacing: 0.02em;
}

html[lang="zh-CN"] .form-group label {
  font-size: 13px;
  letter-spacing: 0.05em;
}

html[lang="zh-CN"] .form-input {
  font-size: 18px;
  line-height: 1.5;
}

html[lang="zh-CN"] .section-header h3 {
  font-size: 24px;
  letter-spacing: 0.01em;
}

html[lang="zh-CN"] .optional-fields::before {
  content: '附加信息';
  font-size: 11px;
}

/* 中文版可选字段标识 */
html[lang="zh-CN"] .optional-fields .form-group label::before {
  content: '(可选) ';
}

/* 英文字体优化 */
html[lang="en"] .hero h2 {
  font-size: clamp(36px, 6vw, 56px);
  letter-spacing: -0.02em;
}

html[lang="en"] .form-group label {
  font-size: 12px;
  letter-spacing: 0.1em;
}

html[lang="en"] .section-header h3 {
  font-size: 28px;
  letter-spacing: -0.01em;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --bg: #0b1020;
    --fg: #e5e7eb;
    --muted: #9ca3af;
    --border: #1f2937;
    --card: #111827;
    --brand: #60a5fa;
    --brand-contrast: #0b1020;
  }
}