/* ═══════════════════════════════════════════════════════════════════
   小易 AI 工作台 - 多主题系统
   Theme System for Xiaoyi AI Workbench
   ═══════════════════════════════════════════════════════════════════ */

/* ── 全局主题过渡效果 ── */
body {
  transition: background 0.4s cubic-bezier(0.4, 0, 0.2, 1),
              color 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

body * {
  transition: background-color 0.3s cubic-bezier(0.4, 0, 0.2, 1),
              border-color 0.3s cubic-bezier(0.4, 0, 0.2, 1),
              color 0.3s cubic-bezier(0.4, 0, 0.2, 1),
              box-shadow 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── 主题选择器模态窗口样式 ── */
.theme-modal {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: grid;
  place-items: center;
  padding: 24px;
  contain: layout style paint;
}

.theme-modal[hidden] {
  display: none;
}

.theme-modal .modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  animation: fadeIn 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.theme-modal-content {
  position: relative;
  width: min(100%, 900px);
  max-height: 90vh;
  overflow: auto;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.2),
              0 0 0 1px rgba(255, 255, 255, 0.1) inset;
  animation: modalSlideUp 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  contain: layout style paint;
}

.theme-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 28px 32px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(to bottom, var(--surface), transparent);
}

.theme-modal-header h3 {
  margin: 0;
  font-size: 22px;
  font-weight: 800;
  color: var(--ink);
  letter-spacing: -0.02em;
}

.theme-modal-header .close-btn {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: transparent;
  border: none;
  color: var(--muted);
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.theme-modal-header .close-btn:hover {
  background: var(--surface-2);
  color: var(--ink);
  transform: scale(1.1);
}

.theme-modal-header .close-btn:active {
  transform: scale(0.95);
}

.theme-modal-body {
  padding: 32px;
}

.theme-section-title {
  margin: 0 0 20px 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.theme-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
  contain: layout style paint;
}

@media (max-width: 768px) {
  .theme-grid {
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 16px;
  }

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

.theme-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 18px;
  border: 2px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  overflow: hidden;
  contain: layout style paint;
}

.theme-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--accent) 0%, transparent 100%);
  opacity: 0;
  transition: opacity 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: none;
}

.theme-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.12),
              0 0 0 1px var(--accent);
}

.theme-card:hover::before {
  opacity: 0.03;
}

.theme-card:active {
  transform: translateY(-2px);
}

.theme-card.active {
  border-color: var(--accent);
  border-width: 3px;
  padding: 17px; /* 补偿边框增加 */
  background: linear-gradient(to bottom right,
              rgba(13, 123, 104, 0.05),
              transparent 60%);
  box-shadow: 0 8px 24px rgba(13, 123, 104, 0.15),
              0 0 0 1px var(--accent) inset;
}

.theme-card.active .theme-check {
  opacity: 1;
  transform: scale(1) rotate(0deg);
}

.theme-preview {
  position: relative;
  height: 110px;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.1) inset,
              0 1px 3px rgba(0, 0, 0, 0.1);
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.theme-card:hover .theme-preview {
  transform: scale(1.02);
}

.theme-preview .preview-surface {
  position: absolute;
  inset: 0;
  opacity: 1;
  transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.theme-preview .preview-content {
  position: absolute;
  bottom: 14px;
  left: 14px;
  right: 14px;
  display: flex;
  flex-direction: column;
  gap: 7px;
  animation: previewPulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes previewPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.85; }
}

.theme-preview .preview-line {
  height: 9px;
  border-radius: 4.5px;
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(8px);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.theme-card:hover .theme-preview .preview-line {
  background: rgba(255, 255, 255, 0.85);
  transform: translateX(2px);
}

.theme-preview .preview-line.short {
  width: 65%;
}

.theme-info {
  display: flex;
  flex-direction: column;
  gap: 6px;
  text-align: left;
  padding: 4px 0;
}

.theme-info strong {
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.01em;
  transition: color 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.theme-card:hover .theme-info strong {
  color: var(--accent);
}

.theme-info small {
  font-size: 12px;
  color: var(--muted);
  line-height: 1.4;
}

.theme-info .theme-tag {
  display: inline-block;
  padding: 2px 8px;
  margin-top: 4px;
  background: var(--surface-2);
  color: var(--accent);
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: 4px;
  width: fit-content;
}

.theme-check {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  background: var(--accent);
  color: white;
  border-radius: 50%;
  opacity: 0;
  transform: scale(0.3) rotate(-180deg);
  transition: all 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2),
              0 0 0 3px var(--surface),
              0 0 0 4px var(--accent);
  z-index: 10;
}

.theme-check svg {
  width: 18px;
  height: 18px;
  stroke-width: 3;
}

/* ── 主题预览颜色 ── */
.theme-preview-light .preview-surface {
  background:
    radial-gradient(circle at 25% 25%, rgba(13, 123, 104, 0.12) 0%, transparent 45%),
    linear-gradient(135deg, rgba(13, 123, 104, 0.12) 0%, transparent 50%),
    linear-gradient(315deg, rgba(213, 155, 36, 0.12) 0%, transparent 50%),
    #f4f6f2;
}

.theme-preview-dark .preview-surface {
  background:
    radial-gradient(circle at 30% 20%, rgba(38, 230, 197, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 70% 70%, rgba(255, 122, 104, 0.12) 0%, transparent 50%),
    linear-gradient(135deg, rgba(38, 230, 197, 0.08) 0%, transparent 50%),
    linear-gradient(315deg, rgba(255, 122, 104, 0.08) 0%, transparent 50%),
    #0a0f0d;
}

.theme-preview-dark .preview-line {
  background: rgba(240, 245, 243, 0.5);
  backdrop-filter: blur(8px);
}

.theme-preview-ocean .preview-surface {
  background:
    radial-gradient(circle at 28% 22%, rgba(11, 109, 253, 0.16) 0%, transparent 50%),
    radial-gradient(circle at 68% 68%, rgba(13, 209, 240, 0.14) 0%, transparent 50%),
    linear-gradient(135deg, rgba(11, 109, 253, 0.12) 0%, transparent 50%),
    linear-gradient(315deg, rgba(13, 209, 240, 0.12) 0%, transparent 50%),
    #f0f5fa;
}

.theme-preview-mint .preview-surface {
  background:
    radial-gradient(circle at 26% 24%, rgba(15, 185, 129, 0.16) 0%, transparent 50%),
    radial-gradient(circle at 72% 66%, rgba(6, 184, 212, 0.14) 0%, transparent 50%),
    linear-gradient(135deg, rgba(15, 185, 129, 0.12) 0%, transparent 50%),
    linear-gradient(315deg, rgba(6, 184, 212, 0.12) 0%, transparent 50%),
    #f0faf6;
}

.theme-preview-sunset .preview-surface {
  background:
    radial-gradient(circle at 30% 26%, rgba(249, 116, 22, 0.16) 0%, transparent 50%),
    radial-gradient(circle at 65% 64%, rgba(245, 160, 11, 0.14) 0%, transparent 50%),
    linear-gradient(135deg, rgba(249, 116, 22, 0.12) 0%, transparent 50%),
    linear-gradient(315deg, rgba(245, 160, 11, 0.12) 0%, transparent 50%),
    #fef7f1;
}

.theme-preview-purple .preview-surface {
  background:
    radial-gradient(circle at 24% 28%, rgba(148, 53, 234, 0.16) 0%, transparent 50%),
    radial-gradient(circle at 70% 62%, rgba(125, 58, 237, 0.14) 0%, transparent 50%),
    linear-gradient(135deg, rgba(148, 53, 234, 0.12) 0%, transparent 50%),
    linear-gradient(315deg, rgba(125, 58, 237, 0.12) 0%, transparent 50%),
    #f8f5fb;
}

.theme-preview-contrast .preview-surface {
  background:
    linear-gradient(135deg, rgba(0, 102, 204, 0.08) 0%, transparent 50%),
    #ffffff;
  border: 2px solid #e0e0e0;
}

.theme-preview-contrast .preview-line {
  background: rgba(0, 0, 0, 0.85);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

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

@keyframes modalSlideUp {
  from {
    opacity: 0;
    transform: translateY(32px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* ── 主题切换加载效果 ── */
@keyframes themeTransition {
  0% { opacity: 1; }
  50% { opacity: 0.95; }
  100% { opacity: 1; }
}

body.theme-transitioning {
  animation: themeTransition 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── 主题 1: 浅色经典 (Default Light) ── */
/* 已在 :root 中定义，这是默认主题 */

/* ── 主题 2: 深色模式 (Dark) ── */
body[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0a0f0d;
  --surface: #151d1a;
  --surface-2: #1f2925;
  --ink: #f0f5f3;
  --muted: #9ba8a2;
  --line: #2a3530;
  --accent: #26e6c5;
  --accent-2: #ff7a68;
  --gold: #ffb946;
  --blue: #6ba7ff;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  --shadow-soft: 0 12px 32px rgba(0, 0, 0, 0.35);
  --shadow-hover: 0 24px 70px rgba(0, 0, 0, 0.6);
}

body[data-theme="dark"] {
  background:
    radial-gradient(circle at 20% 10%, rgba(38, 230, 197, 0.06) 0%, transparent 35%),
    radial-gradient(circle at 80% 80%, rgba(255, 122, 104, 0.05) 0%, transparent 35%),
    linear-gradient(135deg, rgba(38, 230, 197, 0.03) 0%, transparent 30%),
    linear-gradient(315deg, rgba(255, 122, 104, 0.03) 0%, transparent 30%),
    linear-gradient(180deg, #0d1412 0%, var(--bg) 35%, #080c0b 100%);
}

body[data-theme="dark"] .auth-screen {
  background:
    radial-gradient(circle at 50% 20%, rgba(38, 230, 197, 0.1) 0%, transparent 40%),
    radial-gradient(circle at 30% 80%, rgba(255, 122, 104, 0.08) 0%, transparent 35%),
    linear-gradient(135deg, rgba(38, 230, 197, 0.06), transparent 34%),
    linear-gradient(315deg, rgba(255, 122, 104, 0.05), transparent 30%),
    linear-gradient(180deg, #0f1513 0%, #0a0f0d 100%);
}

body[data-theme="dark"] .auth-panel {
  background: rgba(21, 29, 26, 0.92);
  backdrop-filter: blur(24px) saturate(150%);
  border: 1px solid rgba(38, 230, 197, 0.15);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5),
              0 0 0 1px rgba(38, 230, 197, 0.1) inset;
}

body[data-theme="dark"] .auth-logo {
  background: linear-gradient(135deg, #26e6c5, #1fa88f);
  box-shadow: 0 16px 40px rgba(38, 230, 197, 0.35),
              0 0 60px rgba(38, 230, 197, 0.2);
}

body[data-theme="dark"] button:not(.link-btn):not(.close-btn) {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

body[data-theme="dark"] button:not(.link-btn):not(.close-btn):hover {
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.4),
              0 0 0 1px rgba(38, 230, 197, 0.3);
}

body[data-theme="dark"] .theme-card {
  background: rgba(21, 29, 26, 0.6);
  border-color: rgba(255, 255, 255, 0.08);
}

body[data-theme="dark"] .theme-card:hover {
  background: rgba(21, 29, 26, 0.85);
  border-color: var(--accent);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4),
              0 0 0 1px var(--accent);
}

/* ── 主题 3: 海洋蓝 (Ocean Blue) ── */
body[data-theme="ocean"] {
  color-scheme: light;
  --bg: #f0f5fa;
  --surface: #ffffff;
  --surface-2: #e7f0f9;
  --ink: #0d1e32;
  --muted: #5a6c82;
  --line: #d1e1f0;
  --accent: #0b6dfd;
  --accent-2: #0956ca;
  --gold: #ff8817;
  --blue: #0dd1f0;
  --shadow: 0 18px 50px rgba(11, 109, 253, 0.12);
  --shadow-soft: 0 10px 28px rgba(11, 109, 253, 0.1);
  --shadow-hover: 0 24px 60px rgba(11, 109, 253, 0.16);
}

body[data-theme="ocean"] {
  background:
    radial-gradient(circle at 15% 15%, rgba(11, 109, 253, 0.08) 0%, transparent 35%),
    radial-gradient(circle at 85% 75%, rgba(13, 209, 240, 0.08) 0%, transparent 35%),
    linear-gradient(135deg, rgba(11, 109, 253, 0.04) 0%, transparent 30%),
    linear-gradient(315deg, rgba(13, 209, 240, 0.04) 0%, transparent 30%),
    linear-gradient(180deg, #f7fafb 0%, var(--bg) 40%, #edf3f8 100%);
}

body[data-theme="ocean"] .auth-screen {
  background:
    radial-gradient(circle at 50% 25%, rgba(11, 109, 253, 0.15) 0%, transparent 45%),
    radial-gradient(circle at 40% 85%, rgba(13, 209, 240, 0.1) 0%, transparent 35%),
    linear-gradient(135deg, rgba(11, 109, 253, 0.1), transparent 34%),
    linear-gradient(315deg, rgba(13, 209, 240, 0.07), transparent 30%),
    linear-gradient(180deg, #f9fbfd 0%, #f0f6fa 100%);
}

body[data-theme="ocean"] .auth-logo {
  background: linear-gradient(135deg, #0b6dfd 0%, #0dd1f0 100%);
  box-shadow: 0 16px 40px rgba(11, 109, 253, 0.28);
}

body[data-theme="ocean"] button:not(.link-btn):not(.close-btn):not(.sidebar button) {
  box-shadow: 0 4px 14px rgba(11, 109, 253, 0.15);
}

body[data-theme="ocean"] button:not(.link-btn):not(.close-btn):not(.sidebar button):hover {
  box-shadow: 0 6px 20px rgba(11, 109, 253, 0.25);
}

/* ── 主题 4: 薄荷清新 (Mint Fresh) ── */
body[data-theme="mint"] {
  color-scheme: light;
  --bg: #f0faf6;
  --surface: #ffffff;
  --surface-2: #e5f8f0;
  --ink: #0a2d1f;
  --muted: #567065;
  --line: #ceeadd;
  --accent: #0fb981;
  --accent-2: #059669;
  --gold: #f5a30b;
  --blue: #06b8d4;
  --shadow: 0 18px 50px rgba(15, 185, 129, 0.12);
  --shadow-soft: 0 10px 28px rgba(15, 185, 129, 0.1);
  --shadow-hover: 0 24px 60px rgba(15, 185, 129, 0.16);
}

body[data-theme="mint"] {
  background:
    radial-gradient(circle at 20% 18%, rgba(15, 185, 129, 0.08) 0%, transparent 35%),
    radial-gradient(circle at 78% 72%, rgba(6, 184, 212, 0.08) 0%, transparent 35%),
    linear-gradient(135deg, rgba(15, 185, 129, 0.04) 0%, transparent 30%),
    linear-gradient(315deg, rgba(6, 184, 212, 0.04) 0%, transparent 30%),
    linear-gradient(180deg, #f8fcfa 0%, var(--bg) 40%, #f1faf6 100%);
}

body[data-theme="mint"] .auth-screen {
  background:
    radial-gradient(circle at 50% 28%, rgba(15, 185, 129, 0.14) 0%, transparent 45%),
    radial-gradient(circle at 35% 82%, rgba(6, 184, 212, 0.1) 0%, transparent 35%),
    linear-gradient(135deg, rgba(15, 185, 129, 0.1), transparent 34%),
    linear-gradient(315deg, rgba(6, 184, 212, 0.07), transparent 30%),
    linear-gradient(180deg, #fafcfb 0%, #f0f9f5 100%);
}

body[data-theme="mint"] .auth-logo {
  background: linear-gradient(135deg, #0fb981 0%, #06b8d4 100%);
  box-shadow: 0 16px 40px rgba(15, 185, 129, 0.28);
}

body[data-theme="mint"] button:not(.link-btn):not(.close-btn):not(.sidebar button) {
  box-shadow: 0 4px 14px rgba(15, 185, 129, 0.15);
}

body[data-theme="mint"] button:not(.link-btn):not(.close-btn):not(.sidebar button):hover {
  box-shadow: 0 6px 20px rgba(15, 185, 129, 0.25);
}

/* ── 主题 5: 暖阳橙 (Warm Sunset) ── */
body[data-theme="sunset"] {
  color-scheme: light;
  --bg: #fef7f1;
  --surface: #ffffff;
  --surface-2: #fff1e5;
  --ink: #2d160c;
  --muted: #7e5b4c;
  --line: #edd7c8;
  --accent: #f97416;
  --accent-2: #ea590c;
  --gold: #f5a00b;
  --blue: #3b84f6;
  --shadow: 0 18px 50px rgba(249, 116, 22, 0.12);
  --shadow-soft: 0 10px 28px rgba(249, 116, 22, 0.1);
  --shadow-hover: 0 24px 60px rgba(249, 116, 22, 0.16);
}

body[data-theme="sunset"] {
  background:
    radial-gradient(circle at 22% 20%, rgba(249, 116, 22, 0.08) 0%, transparent 35%),
    radial-gradient(circle at 75% 70%, rgba(245, 160, 11, 0.08) 0%, transparent 35%),
    linear-gradient(135deg, rgba(249, 116, 22, 0.04) 0%, transparent 30%),
    linear-gradient(315deg, rgba(245, 160, 11, 0.04) 0%, transparent 30%),
    linear-gradient(180deg, #fffcf8 0%, var(--bg) 40%, #fef7f2 100%);
}

body[data-theme="sunset"] .auth-screen {
  background:
    radial-gradient(circle at 50% 30%, rgba(249, 116, 22, 0.14) 0%, transparent 45%),
    radial-gradient(circle at 38% 78%, rgba(245, 160, 11, 0.1) 0%, transparent 35%),
    linear-gradient(135deg, rgba(249, 116, 22, 0.1), transparent 34%),
    linear-gradient(315deg, rgba(245, 160, 11, 0.07), transparent 30%),
    linear-gradient(180deg, #fffdf9 0%, #fef5ee 100%);
}

body[data-theme="sunset"] .auth-logo {
  background: linear-gradient(135deg, #f97416 0%, #f5a00b 100%);
  box-shadow: 0 16px 40px rgba(249, 116, 22, 0.28);
}

body[data-theme="sunset"] button:not(.link-btn):not(.close-btn):not(.sidebar button) {
  box-shadow: 0 4px 14px rgba(249, 116, 22, 0.15);
}

body[data-theme="sunset"] button:not(.link-btn):not(.close-btn):not(.sidebar button):hover {
  box-shadow: 0 6px 20px rgba(249, 116, 22, 0.25);
}

/* ── 主题 6: 优雅紫 (Elegant Purple) ── */
body[data-theme="purple"] {
  color-scheme: light;
  --bg: #f8f5fb;
  --surface: #ffffff;
  --surface-2: #f1ecf8;
  --ink: #2a1839;
  --muted: #6b5280;
  --line: #dfd2ea;
  --accent: #9435ea;
  --accent-2: #7d3aed;
  --gold: #f5a00b;
  --blue: #3b84f6;
  --shadow: 0 18px 50px rgba(148, 53, 234, 0.12);
  --shadow-soft: 0 10px 28px rgba(148, 53, 234, 0.1);
  --shadow-hover: 0 24px 60px rgba(148, 53, 234, 0.16);
}

body[data-theme="purple"] {
  background:
    radial-gradient(circle at 18% 22%, rgba(148, 53, 234, 0.08) 0%, transparent 35%),
    radial-gradient(circle at 80% 68%, rgba(125, 58, 237, 0.08) 0%, transparent 35%),
    linear-gradient(135deg, rgba(148, 53, 234, 0.04) 0%, transparent 30%),
    linear-gradient(315deg, rgba(125, 58, 237, 0.04) 0%, transparent 30%),
    linear-gradient(180deg, #fbfafd 0%, var(--bg) 40%, #f6f3fa 100%);
}

body[data-theme="purple"] .auth-screen {
  background:
    radial-gradient(circle at 50% 32%, rgba(148, 53, 234, 0.14) 0%, transparent 45%),
    radial-gradient(circle at 42% 75%, rgba(125, 58, 237, 0.1) 0%, transparent 35%),
    linear-gradient(135deg, rgba(148, 53, 234, 0.1), transparent 34%),
    linear-gradient(315deg, rgba(125, 58, 237, 0.07), transparent 30%),
    linear-gradient(180deg, #fcfbfe 0%, #f5f1f9 100%);
}

body[data-theme="purple"] .auth-logo {
  background: linear-gradient(135deg, #9435ea 0%, #7d3aed 100%);
  box-shadow: 0 16px 40px rgba(148, 53, 234, 0.28);
}

body[data-theme="purple"] button:not(.link-btn):not(.close-btn):not(.sidebar button) {
  box-shadow: 0 4px 14px rgba(148, 53, 234, 0.15);
}

body[data-theme="purple"] button:not(.link-btn):not(.close-btn):not(.sidebar button):hover {
  box-shadow: 0 6px 20px rgba(148, 53, 234, 0.25);
}

/* ── 主题 7: 高对比度 (High Contrast) ── */
body[data-theme="contrast"] {
  color-scheme: light;
  --bg: #ffffff;
  --surface: #ffffff;
  --surface-2: #f5f5f5;
  --ink: #000000;
  --muted: #404040;
  --line: #cccccc;
  --accent: #0066cc;
  --accent-2: #0052a3;
  --gold: #e68a00;
  --blue: #0077cc;
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  --shadow-soft: 0 2px 8px rgba(0, 0, 0, 0.15);
  --shadow-hover: 0 6px 16px rgba(0, 0, 0, 0.25);
}

body[data-theme="contrast"] {
  background: #ffffff;
}

body[data-theme="contrast"] .auth-screen {
  background: #f5f5f5;
}

body[data-theme="contrast"] .auth-panel {
  border: 2px solid #000000;
}

body[data-theme="contrast"] .auth-logo {
  background: #0066cc;
  box-shadow: 0 4px 12px rgba(0, 102, 204, 0.4);
}

body[data-theme="contrast"] * {
  text-shadow: none !important;
}

/* ── 侧边导航保持固定工作区外观，不参与亮色主题光效 ── */
body[data-theme] .sidebar button:not(.link-btn):not(.close-btn):not(.nav-group-toggle):not(.nav-item):not(.sidebar-edge-toggle),
body[data-theme] .sidebar button:not(.link-btn):not(.close-btn):not(.nav-group-toggle):not(.nav-item):not(.sidebar-edge-toggle):hover {
  box-shadow: none;
}

body[data-theme] .sidebar button.nav-group-toggle:not(.link-btn):not(.close-btn) {
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.08),
    0 1px 3px rgba(0, 0, 0, 0.2),
    0 0 12px rgba(33, 217, 187, 0.03);
}

body[data-theme] .sidebar button.nav-group-toggle:not(.link-btn):not(.close-btn):hover {
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.1),
    0 6px 16px rgba(0, 0, 0, 0.18),
    0 0 18px color-mix(in srgb, var(--group-accent, #21d9bb) 8%, transparent);
}

body[data-theme] .sidebar button.nav-item:not(.link-btn):not(.close-btn) {
  box-shadow: none;
}

body[data-theme] .sidebar button.nav-item:not(.link-btn):not(.close-btn):hover {
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.14);
}

body[data-theme] .sidebar button.nav-item:not(.link-btn):not(.close-btn).active {
  box-shadow:
    0 8px 24px rgba(0, 0, 0, 0.2),
    inset 0 1px 0 rgba(255, 255, 255, 0.06),
    inset 0 0 0 1px color-mix(in srgb, var(--group-accent, #21d9bb) 10%, transparent);
}

body[data-theme] .app-shell.sidebar-collapsed .sidebar button.nav-item:not(.link-btn):not(.close-btn).active {
  box-shadow: inset 0 0 0 1px rgba(32, 219, 185, 0.24), 0 14px 30px rgba(0, 0, 0, 0.2);
}

body[data-theme] .sidebar button.sidebar-edge-toggle:not(.link-btn):not(.close-btn) {
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.24);
}

body[data-theme] .sidebar button.sidebar-edge-toggle:not(.link-btn):not(.close-btn):hover {
  box-shadow: 0 18px 38px rgba(0, 0, 0, 0.3);
}

/* ── 深色模式兼容旧类名 ── */
body.dark-theme {
  color-scheme: dark;
  --bg: #0f1614;
  --surface: #1a221f;
  --surface-2: #232b28;
  --ink: #e5ece9;
  --muted: #8f9d97;
  --line: #2d3834;
  --accent: #21d9bb;
  --accent-2: #ff6b5a;
  --gold: #f4b944;
  --blue: #5b9eff;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.4);
  --shadow-soft: 0 10px 28px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 22px 60px rgba(0, 0, 0, 0.5);
}

body.dark-theme {
  background:
    linear-gradient(135deg, rgba(33, 217, 187, 0.04) 0%, transparent 26%),
    linear-gradient(315deg, rgba(255, 107, 90, 0.04) 0%, transparent 30%),
    linear-gradient(180deg, #12181a 0%, var(--bg) 46%, #0d1311 100%);
}