:root {
    --primary: #7c3aed;
    --primary-hover: #6d28d9;
    --primary-light: #8b5cf6;
    --primary-bg: rgba(124, 58, 237, 0.08);
    --primary-border: rgba(124, 58, 237, 0.3);
    --success: #10b981;
    --success-hover: #059669;
    --success-bg: rgba(16, 185, 129, 0.08);
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.08);
    --error: #ef4444;
    --error-bg: rgba(239, 68, 68, 0.08);
    --info: #3b82f6;
    --info-bg: rgba(59, 130, 246, 0.08);
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-page: #f0f2f5;
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-tertiary: #64748b;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    --radius-full: 9999px;
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.35s ease;
    --header-height: 64px
}

body.dark {
    --primary: #a78bfa;
    --primary-hover: #8b5cf6;
    --primary-light: #c4b5fd;
    --primary-bg: rgba(167, 139, 250, 0.12);
    --primary-border: rgba(167, 139, 250, 0.3);
    --success: #34d399;
    --success-hover: #10b981;
    --success-bg: rgba(52, 211, 153, 0.12);
    --bg-primary: #1e1e2e;
    --bg-secondary: #181825;
    --bg-tertiary: #11111b;
    --bg-page: #0f0f17;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    --text-muted: #64748b;
    --border-color: #313244;
    --border-hover: #45475a;
    --gray-50: #1e1e2e;
    --gray-100: #181825;
    --gray-200: #313244;
    --gray-700: #cdd6f4;
    --gray-800: #bac2de;
    --gray-900: #f1f5f9;
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -4px rgba(0, 0, 0, 0.2)
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%
}

body {
    font: 14px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--text-primary);
    background: var(--bg-page);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    opacity: 0;
    transition: opacity 0.3s ease
}

body.app-ready {
    opacity: 1
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: var(--radius-full)
}

::-webkit-scrollbar-thumb {
    background: var(--gray-300);
    border-radius: var(--radius-full);
    transition: background var(--transition-fast)
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gray-400)
}

body.dark::-webkit-scrollbar-thumb {
    background: var(--gray-600)
}

body.dark::-webkit-scrollbar-thumb:hover {
    background: var(--gray-500)
}

::selection {
    background: var(--primary);
    color: white
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: background var(--transition-normal), border-color var(--transition-normal)
}

body.dark .header {
    background: rgba(30, 30, 46, 0.9)
}

.header-content {
    max-width: 1400px;
    height: 100%;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    user-select: none
}

.logo {
    width: 38px;
    height: 38px;
    object-fit: contain;
    transition: transform var(--transition-normal);
    box-shadow: -8px 5px 10px rgb(0 0 0 / 50%);
    border-radius: 50%
}

.logo-section:active .logo {
    transform: scale(0.92)
}

.site-title {
    font-size: 18px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em
}

.header-actions {
    display: flex;
    gap: 8px
}

.btn-icon,
.btn-clear-history {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: var(--radius-md);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    transition: all var(--transition-fast)
}

.btn-icon:active,
.btn-clear-history:active {
    background: var(--primary-bg);
    color: var(--primary);
    transform: scale(0.92)
}

.btn-icon:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important
}

.btn-clear-history {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-muted);
    font-size: 13px;
    opacity: 0;
    pointer-events: none
}

.history-section:has(.history-item) .btn-clear-history {
    opacity: 1;
    pointer-events: auto
}

.btn-clear-history:active {
    background: var(--error-bg);
    color: var(--error);
    transform: scale(0.9)
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 20px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    user-select: none
}

.btn i {
    font-size: 14px
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed
}

.btn:disabled:active,
.btn:disabled:hover {
    transform: none !important;
    box-shadow: none !important
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-hover));
    color: white;
    box-shadow: 0 4px 14px rgba(124, 58, 237, 0.35)
}

.btn-primary:active {
    transform: scale(0.96);
    box-shadow: 0 2px 8px rgba(124, 58, 237, 0.3)
}

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

.btn-secondary:active {
    background: var(--gray-200);
    transform: scale(0.96)
}

body.dark .btn-secondary:active,
body.dark .btn-secondary:hover {
    background: var(--gray-200)
}

.btn-success {
    background: linear-gradient(135deg, var(--success), var(--success-hover));
    color: white;
    box-shadow: 0 4px 14px rgba(16, 185, 129, 0.3)
}

.btn-success:active {
    transform: scale(0.96);
    box-shadow: 0 2px 8px rgba(16, 185, 129, 0.25)
}

.btn-group {
    display: flex;
    gap: 12px;
    margin-top: 24px;
    padding: 0 24px
}

.btn-group .btn {
    flex: 1
}

.main-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: calc(var(--header-height) + 24px) 24px 40px;
    display: grid;
    grid-template-columns: minmax(360px, 1fr) minmax(360px, 1fr);
    gap: 24px;
    min-height: 100vh
}

.card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: border-color var(--transition-normal), box-shadow var(--transition-normal)
}

.card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary)
}

.card-header i {
    font-size: 18px;
    color: var(--primary)
}

.card-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary)
}

.config-section .card {
    padding-bottom: 24px
}

.tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color)
}

.tab-btn {
    flex: 1;
    min-width: calc(33.333% - 8px);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    padding: 14px 10px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-tertiary);
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast)
}

.tab-btn i {
    font-size: 18px;
    transition: transform var(--transition-fast)
}

.tab-btn:active {
    transform: scale(0.96)
}

.tab-btn.active {
    border-color: var(--primary);
    background: var(--primary-bg);
    color: var(--primary)
}

.tab-btn.active i {
    transform: scale(1.1)
}

.form-section {
    padding: 20px 24px
}

.form-section.hidden {
    display: none
}

.form-group {
    margin-bottom: 20px
}

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

.form-label {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary)
}

.form-label i {
    font-size: 14px;
    color: var(--primary);
    opacity: 0.8
}

.required {
    color: var(--error);
    font-size: 12px
}

.form-input,
.form-textarea,
.form-select,
.color-value {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
    transition: all var(--transition-fast)
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus,
.color-value:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px var(--primary-bg)
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--text-muted)
}

.form-textarea {
    resize: vertical;
    min-height: 100px
}

.form-select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 44px
}

.color-value {
    padding: 12px 14px;
    font-family: "SF Mono", Monaco, "Cascadia Code", monospace;
    text-transform: uppercase
}

.divider {
    height: 1px;
    background: var(--border-color);
    margin: 0 24px
}

.collapse-panel {
    border-top: 1px solid var(--border-color)
}

.collapse-panel:first-of-type {
    border-top: none
}

.collapse-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 24px;
    cursor: pointer;
    user-select: none;
    transition: background var(--transition-fast)
}

.collapse-header:active {
    background: var(--bg-tertiary)
}

.collapse-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary)
}

.collapse-title i {
    font-size: 16px;
    color: var(--primary)
}

.collapse-icon {
    font-size: 12px;
    color: var(--text-muted);
    transition: transform var(--transition-normal)
}

.collapse-panel.open .collapse-icon {
    transform: rotate(180deg)
}

.collapse-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow)
}

.collapse-panel.open .collapse-content {
    max-height: 1000px
}

.collapse-inner {
    padding: 0 24px 24px
}

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

.color-picker-wrapper {
    display: flex;
    gap: 12px;
    align-items: center;
    margin-bottom: 12px
}

.color-picker {
    width: 48px;
    height: 48px;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    padding: 0;
    overflow: hidden
}

.color-picker::-webkit-color-swatch-wrapper {
    padding: 0
}

.color-picker::-webkit-color-swatch {
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md)
}

.color-presets {
    display: flex;
    flex-wrap: wrap;
    gap: 8px
}

.color-preset {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    border: 3px solid transparent;
    transition: all var(--transition-fast);
    position: relative
}

.color-preset:active {
    transform: scale(0.9)
}

.color-preset.active {
    border-color: var(--text-primary);
    box-shadow: 0 0 0 2px var(--bg-primary)
}

.size-options,
.error-levels {
    display: flex;
    flex-wrap: wrap;
    gap: 8px
}

.size-option,
.error-level {
    flex: 1;
    min-width: 60px;
    padding: 12px 8px;
    text-align: center;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast)
}

.size-option:active,
.error-level:active {
    transform: scale(0.95)
}

.size-option.active {
    border-color: var(--primary);
    background: var(--primary);
    color: white
}

.error-level {
    padding: 14px 8px
}

.error-level.active {
    border-color: var(--primary);
    background: var(--primary)
}

.error-level-value {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
    transition: color var(--transition-fast)
}

.error-level.active .error-level-value {
    color: white
}

.error-level-label {
    font-size: 11px;
    color: var(--text-muted)
}

.error-level.active .error-level-label {
    color: rgba(255, 255, 255, 0.8)
}

.slider-wrapper {
    margin-bottom: 8px
}

.slider-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px
}

.slider-value {
    font-size: 14px;
    font-weight: 700;
    color: var(--primary);
    background: var(--primary-bg);
    padding: 4px 12px;
    border-radius: var(--radius-full)
}

.slider {
    width: 100%;
    height: 8px;
    border-radius: var(--radius-full);
    background: var(--gray-200);
    appearance: none;
    cursor: pointer;
    outline: none
}

.slider::-webkit-slider-thumb {
    appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    border: 3px solid white;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast)
}

.slider::-webkit-slider-thumb:active {
    transform: scale(1.15);
    box-shadow: var(--shadow-lg)
}

.slider::-moz-range-thumb {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    border: 3px solid white;
    box-shadow: var(--shadow-md)
}

.switch-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 0
}

.switch-label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary)
}

.switch {
    width: 52px;
    height: 28px;
    border-radius: var(--radius-full);
    background: var(--gray-300);
    cursor: pointer;
    position: relative;
    transition: background var(--transition-fast)
}

.switch::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: white;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-fast)
}

.switch.active {
    background: var(--primary)
}

.switch.active::after {
    transform: translateX(24px)
}

.file-upload {
    position: relative;
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 28px 20px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    overflow: hidden
}

.file-upload:active {
    border-color: var(--primary);
    background: var(--primary-bg)
}

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

.file-upload-icon {
    font-size: 36px;
    color: var(--text-muted);
    margin-bottom: 12px;
    transition: all var(--transition-fast)
}

.file-upload-text {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px
}

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

.file-preview {
    display: none;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    position: relative;
    z-index: 2
}

.file-upload.has-file .file-preview {
    display: flex
}

.file-upload.has-file .file-upload-icon,
.file-upload.has-file .file-upload-text,
.file-upload.has-file .file-upload-hint {
    display: none
}

.file-preview-img {
    max-width: 120px;
    max-height: 80px;
    border-radius: var(--radius-md);
    object-fit: contain;
    border: 2px solid var(--border-color)
}

.file-remove {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    border: none;
    border-radius: var(--radius-md);
    background: var(--error-bg);
    color: var(--error);
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast)
}

.file-remove:active {
    background: var(--error);
    color: white;
    transform: scale(0.95)
}

.preview-section {
    position: sticky;
    top: calc(var(--header-height) + 24px);
    height: fit-content
}

.preview-card {
    display: flex;
    flex-direction: column
}

.preview-area {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 320px;
    padding: 32px;
    background: linear-gradient(45deg, var(--gray-100) 25%, transparent 25%), linear-gradient(-45deg, var(--gray-100) 25%, transparent 25%), linear-gradient(45deg, transparent 75%, var(--gray-100) 75%), linear-gradient(-45deg, transparent 75%, var(--gray-100) 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px
}

body.dark .preview-area {
    background: linear-gradient(45deg, var(--gray-200) 25%, transparent 25%), linear-gradient(-45deg, var(--gray-200) 25%, transparent 25%), linear-gradient(45deg, transparent 75%, var(--gray-200) 75%), linear-gradient(-45deg, transparent 75%, var(--gray-200) 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px
}

.preview-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    color: var(--text-muted);
    text-align: center;
    padding: 20px
}

.preview-placeholder.hidden {
    display: none
}

.preview-placeholder i {
    font-size: 64px;
    opacity: 0.3
}

.preview-placeholder p {
    font-size: 14px;
    max-width: 200px;
    line-height: 1.5
}

#qrcode-canvas {
    max-width: 100%;
    max-height: 400px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg)
}

#qrcode-canvas.hidden {
    display: none
}

.loading-overlay {
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.9);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 10
}

.loading-overlay.active {
    display: flex
}

body.dark .loading-overlay {
    background: rgba(30, 30, 46, 0.9)
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite
}

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

.preview-toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 20px 24px;
    border-top: 1px solid var(--border-color);
    background: var(--bg-secondary)
}

.preview-info {
    display: flex;
    gap: 20px
}

.preview-info-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-secondary)
}

.preview-info-item i {
    color: var(--primary);
    font-size: 14px
}

.preview-actions {
    display: flex;
    gap: 10px
}

.preview-actions .btn {
    padding: 10px 16px;
    font-size: 13px
}

.history-section {
    border-top: 1px solid var(--border-color)
}

.history-section .collapse-panel {
    border-top: none
}

.history-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px
}

.history-empty {
    grid-column: 1 / -1;
    text-align: center;
    color: var(--text-muted);
    font-size: 13px;
    padding: 20px
}

.history-item {
    aspect-ratio: 1;
    border-radius: var(--radius-md);
    border: 2px solid var(--border-color);
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition-fast)
}

.history-item:active {
    transform: scale(0.95);
    border-color: var(--primary)
}

.history-item.active {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-bg)
}

.history-item img {
    width: 100%;
    height: 100%;
    object-fit: cover
}

#toast-container {
    position: fixed;
    top: calc(var(--header-height) + 20px);
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 10px;
    pointer-events: none
}

.toast {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 20px;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-color);
    transform: translateX(120%);
    opacity: 0;
    transition: all var(--transition-normal);
    pointer-events: auto
}

.toast.show {
    transform: translateX(0);
    opacity: 1
}

.toast-icon {
    font-size: 18px
}

.toast-message {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary)
}

.toast-success .toast-icon {
    color: var(--success)
}

.toast-error .toast-icon {
    color: var(--error)
}

.toast-warning .toast-icon {
    color: var(--warning)
}

.toast-info .toast-icon {
    color: var(--info)
}

.hidden {
    display: none !important
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0
}

.mode-switch-container {
    grid-column: 1 / -1;
    display: flex;
    justify-content: center;
    margin-bottom: 8px
}

.mode-switch {
    display: flex;
    gap: 8px;
    padding: 6px;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm)
}

.mode-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    background: transparent;
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast)
}

.mode-btn i {
    font-size: 18px
}

.mode-btn:active {
    transform: scale(0.96)
}

.mode-btn.active {
    background: linear-gradient(135deg, var(--primary), var(--primary-hover));
    color: white;
    border-color: var(--primary);
    box-shadow: 0 4px 14px rgba(124, 58, 237, 0.35)
}

.decode-section {
    display: flex;
    flex-direction: column;
    gap: 20px
}

.decode-section.hidden {
    display: none
}

.decode-content {
    padding: 24px
}

.decode-upload {
    min-height: 180px
}

.divider-text {
    display: flex;
    align-items: center;
    gap: 16px;
    margin: 20px 0;
    color: var(--text-muted);
    font-size: 13px
}

.divider-text::before,
.divider-text::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-color)
}

.url-input-wrapper {
    display: flex;
    gap: 10px
}

.url-input-wrapper .form-input {
    flex: 1
}

.url-load-btn {
    padding: 14px 18px !important;
    flex-shrink: 0
}

.decode-btn-group {
    margin-top: 20px;
    padding: 0
}

.decode-result-card {
    flex: 1
}

.decode-result-content {
    padding: 24px
}

.decode-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    color: var(--text-muted);
    text-align: center;
    padding: 40px 20px;
    min-height: 200px
}

.decode-placeholder i {
    font-size: 64px;
    opacity: 0.3
}

.decode-placeholder p {
    font-size: 14px;
    max-width: 200px;
    line-height: 1.5
}

.decode-result {
    display: flex;
    flex-direction: column;
    gap: 20px
}

.decode-result-type {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--primary-bg);
    color: var(--primary);
    border-radius: var(--radius-full);
    font-size: 13px;
    font-weight: 600;
    width: fit-content
}

.decode-result-type i {
    font-size: 14px
}

.decode-result-text textarea {
    background: var(--bg-tertiary);
    min-height: 120px;
    font-family: "SF Mono", Monaco, "Cascadia Code", monospace;
    font-size: 14px;
    line-height: 1.6
}

.decode-result-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap
}

.decode-result-actions .btn {
    flex: 1;
    min-width: 140px
}

/* ============ Hover效果 - 集中管理 ============ */
@media (hover:hover) {
    .logo-section:hover .logo {
        transform: scale(1.05) rotate(-5deg)
    }

    .btn-icon:hover,
    .btn-clear-history:hover {
        background: var(--primary-bg);
        color: var(--primary);
        transform: translateY(-2px)
    }

    .btn-clear-history:hover {
        background: var(--error-bg);
        color: var(--error);
        transform: none
    }

    .btn-primary:not(:disabled):hover {
        transform: translateY(-2px);
        box-shadow: 0 6px 20px rgba(124, 58, 237, 0.45)
    }

    .btn-secondary:not(:disabled):hover {
        background: var(--gray-200);
        border-color: var(--border-hover);
        transform: translateY(-2px)
    }

    .btn-success:not(:disabled):hover {
        transform: translateY(-2px);
        box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4)
    }

    .tab-btn:hover:not(.active) {
        border-color: var(--primary-border);
        color: var(--primary);
        background: var(--primary-bg)
    }

    .tab-btn:hover i {
        transform: scale(1.1)
    }

    .collapse-header:hover {
        background: var(--bg-tertiary)
    }

    .color-preset:hover {
        transform: scale(1.15);
        z-index: 1
    }

    .size-option:hover:not(.active),
    .error-level:hover:not(.active) {
        border-color: var(--primary-border);
        color: var(--primary);
        background: var(--primary-bg)
    }

    .error-level:hover:not(.active) .error-level-value {
        color: var(--primary)
    }

    .slider::-webkit-slider-thumb:hover {
        transform: scale(1.15);
        box-shadow: var(--shadow-lg)
    }

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

    .file-upload:hover .file-upload-icon {
        transform: scale(1.1);
        color: var(--primary)
    }

    .file-remove:hover {
        background: var(--error);
        color: white
    }

    .history-item:hover {
        border-color: var(--primary);
        transform: scale(1.05);
        box-shadow: var(--shadow-md);
        z-index: 1;
        position: relative
    }

    .mode-btn:hover:not(.active) {
        background: var(--primary-bg);
        color: var(--primary);
        border-color: var(--primary-border)
    }
}

/* ============ 响应式设计 ============ */
@media (max-width:1024px) {
    .main-container {
        grid-template-columns: 1fr;
        gap: 20px;
        padding: calc(var(--header-height) + 16px) 16px 32px
    }

    .preview-section {
        position: static;
        order: -1
    }

    .preview-area {
        min-height: 280px
    }

    .history-grid {
        grid-template-columns: repeat(6, 1fr)
    }
}

@media (max-width:640px) {
    :root {
        --header-height: 56px
    }

    .header-content {
        padding: 0 16px
    }

    .site-title {
        font-size: 16px
    }

    .logo {
        width: 32px;
        height: 32px
    }

    .main-container {
        padding: calc(var(--header-height) + 12px) 12px 24px;
        gap: 16px
    }

    .card-header {
        padding: 16px 18px
    }

    .tabs {
        padding: 16px 18px;
        gap: 6px
    }

    .tab-btn {
        min-width: calc(33.333% - 6px);
        padding: 12px 6px;
        font-size: 11px
    }

    .tab-btn i {
        font-size: 16px
    }

    .form-section {
        padding: 16px 18px
    }

    .collapse-header {
        padding: 14px 18px
    }

    .collapse-inner {
        padding: 0 18px 18px
    }

    .divider {
        margin: 0 18px
    }

    .btn-group {
        flex-direction: column;
        gap: 10px
    }

    .preview-area {
        min-height: 240px;
        padding: 24px
    }

    .preview-toolbar {
        flex-direction: column;
        gap: 12px;
        padding: 16px 18px
    }

    .preview-info,
    .preview-actions {
        width: 100%;
        justify-content: center
    }

    .history-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 8px
    }

    .size-options {
        gap: 6px
    }

    .size-option {
        min-width: 50px;
        padding: 10px 6px;
        font-size: 12px
    }

    .error-levels {
        gap: 6px
    }

    .error-level {
        padding: 12px 6px
    }

    .error-level-value {
        font-size: 16px
    }

    #toast-container {
        left: 12px;
        right: 12px
    }

    .toast {
        transform: translateY(-100%)
    }

    .toast.show {
        transform: translateY(0)
    }

    .mode-switch {
        flex-direction: column;
        width: 100%
    }

    .mode-btn {
        justify-content: center;
        padding: 12px 20px
    }

    .url-input-wrapper {
        flex-direction: column
    }

    .url-load-btn {
        width: 100%
    }

    .decode-result-actions {
        flex-direction: column
    }

    .decode-result-actions .btn {
        min-width: auto
    }
}

@media (max-width:360px) {
    .tab-btn {
        min-width: calc(50% - 4px)
    }

    .history-grid {
        grid-template-columns: repeat(3, 1fr)
    }

    .preview-actions {
        flex-wrap: wrap
    }

    .preview-actions .btn {
        flex: 1;
        min-width: 80px
    }
}

@media (max-height:700px) and (min-width:1024px) {
    .preview-section {
        position: static
    }
}

@media print {
    .header,
    .config-section,
    .preview-toolbar,
    .history-section,
    #toast-container {
        display: none !important
    }

    body {
        background: white
    }

    .main-container {
        display: block;
        padding: 0
    }

    .preview-card {
        border: none;
        box-shadow: none
    }

    .preview-area {
        background: white !important;
        min-height: auto
    }

    #qrcode-canvas {
        box-shadow: none;
        max-width: 300px;
        margin: 0 auto
    }
}

@media (prefers-contrast:high) {
    :root {
        --border-color: #000;
        --text-primary: #000
    }

    .btn-primary,
    .btn-success {
        background: #000 !important
    }
}

@media (prefers-reduced-motion:reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important
    }
}