:root {
    --c-primary: #0071e3;
    --c-primary-light: #f0f9ff;
    --c-success: #28a745;
    --c-success-light: #f0fbf3;
    --c-danger: #dc3545;
    --c-danger-light: #fdf2f2;
    --c-info: #6c757d;
    --c-info-light: #f8f9fa;
    
    --c-bg: #f5f5f7;
    --c-surface: #ffffff;
    --c-text: #1d1d1f;
    --c-text-secondary: #515154;
    --c-border: #d2d2d7;
    
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
}

@media (prefers-color-scheme: dark) {
    :root {
        --c-primary: #0077ed;
        --c-bg: #111111;
        --c-surface: #1d1d1d;
        --c-text: #f5f5f7;
        --c-text-secondary: #a1a1a6;
        --c-border: #3a3a3c;
        --c-primary-light: rgba(0, 119, 237, 0.1);
        --c-success-light: rgba(40, 167, 69, 0.1);
        --c-danger-light: rgba(220, 53, 69, 0.1);
        --c-info-light: #2c2c2e;
    }
}

* {
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html {
    font-size: 16px;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--c-bg);
    color: var(--c-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.page-wrapper {
    max-width: 720px;
    margin: 0 auto;
    padding: 24px 16px;
}

.page-header {
    text-align: center;
    margin-bottom: 32px;
}
.page-header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin: 0 0 8px;
}
.page-header p {
    font-size: 1.1rem;
    color: var(--c-text-secondary);
    margin: 0;
}

.card {
    background-color: var(--c-surface);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 24px;
    border: 1px solid var(--c-border);
    box-shadow: var(--shadow-sm);
}

.upload-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.btn {
    width: 100%;
    padding: 14px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.15s ease, background-color 0.15s ease, box-shadow 0.15s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: 1px solid transparent;
}
.btn:active {
    transform: scale(0.97);
}
.btn-primary {
    background-color: var(--c-primary);
    color: white;
    box-shadow: var(--shadow-md);
}
.btn-primary:hover {
    filter: brightness(1.1);
}
.btn-secondary {
    background-color: var(--c-surface);
    color: var(--c-primary);
    border-color: var(--c-primary);
}
.btn-secondary:hover {
    background-color: var(--c-primary-light);
}

.status-box {
    margin-top: 16px;
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 0.9rem;
    text-align: center;
    font-weight: 500;
    display: none; /* Initially hidden */
}
.status-box.visible {
    display: block;
}
.status-box.success {
    background-color: var(--c-success-light);
    color: var(--c-success);
}
.status-box.error {
    background-color: var(--c-danger-light);
    color: var(--c-danger);
}
.status-box.info {
    background-color: var(--c-info-light);
    color: var(--c-info);
}

.form-group {
    margin-bottom: 20px;
}
.form-group:last-child {
    margin-bottom: 0;
}
.form-label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    font-size: 0.9rem;
}
.form-select, .form-range {
    width: 100%;
    padding: 12px;
    font-size: 1rem;
    border: 1px solid var(--c-border);
    border-radius: 8px;
    background-color: var(--c-bg);
    color: var(--c-text);
    -webkit-appearance: none;
    appearance: none;
}
.form-select {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 12px center;
    background-repeat: no-repeat;
    background-size: 1.5em;
}
.quality-display {
    display: flex;
    align-items: center;
    gap: 16px;
}
.quality-value {
    font-weight: 600;
    color: var(--c-primary);
    font-size: 1rem;
}

.preview-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 32px;
    margin-top: 24px;
}
.preview-item {
    text-align: center;
}
.preview-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 16px;
}
.preview-canvas {
    width: 100%;
    height: auto;
    max-width: 320px;
    border-radius: 24px;
    box-shadow: var(--shadow-md);
    border: 4px solid var(--c-surface);
    outline: 1px solid var(--c-border);
}
.btn-download {
    margin-top: 16px;
    background-color: var(--c-success);
    color: white;
    border: none;
}

.loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
}
.spinner-wrapper {
    background: var(--c-surface);
    padding: 30px;
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    text-align: center;
}
.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid var(--c-border);
    border-top: 5px solid var(--c-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}
.modal-overlay.visible {
    opacity: 1;
    pointer-events: auto;
}
.modal-content {
    background: var(--c-surface);
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    width: 90%;
    max-width: 1000px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    transform: scale(0.95);
    transition: transform 0.3s ease;
}
.modal-overlay.visible .modal-content {
    transform: scale(1);
}
.modal-header {
    padding: 16px 24px;
    border-bottom: 1px solid var(--c-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.modal-header h2 {
    margin: 0;
    font-size: 1.25rem;
}
.modal-close-btn {
    background: none;
    border: none;
    font-size: 2rem;
    line-height: 1;
    cursor: pointer;
    color: var(--c-text-secondary);
}
.modal-body {
    padding: 24px;
    overflow-y: auto;
    flex-grow: 1;
}
.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--c-border);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}
.modal-footer .btn {
    width: auto;
    padding: 10px 20px;
}

/* Icon Customizer Styles */
.icon-customizer {
    display: flex;
    flex-direction: column;
    gap: 32px;
}
.icon-section h3 {
    margin: 0 0 16px;
    border-bottom: 1px solid var(--c-border);
    padding-bottom: 8px;
}
.icon-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}
.icon-list-wrapper h4 {
    margin: 0 0 12px;
    font-size: 0.9rem;
    color: var(--c-text-secondary);
}
.icon-list {
    background-color: var(--c-bg);
    border-radius: 8px;
    padding: 12px;
    min-height: 200px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-content: flex-start;
}
.icon-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 64px;
    padding: 8px;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.2s;
}
.icon-item:hover {
    background-color: rgba(0, 119, 237, 0.1);
}
.icon-item img {
    width: 48px;
    height: 48px;
}
.icon-item span {
    font-size: 12px;
    text-align: center;
    margin-top: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    width: 100%;
}
.icon-list.selected .icon-item {
    cursor: grab;
}
.icon-item.dragging {
    opacity: 0.5;
}
.icon-item.disabled {
    opacity: 0.4;
    cursor: not-allowed;
    filter: grayscale(80%);
}

.icon-item.disabled:hover {
    background-color: transparent; /* 禁用悬停效果 */
}