:root {
    --win-blue: #0078D7;
    --win-dark-blue: #005A9E;
    --win-green: #107C10;
    --win-dark-green: #0B5C0B;
    --win-orange: #D83B01;
    --win-dark-orange: #A42D01;
    --win-red: #E81123;
    --win-dark-red: #B80D1C;
    --win-purple: #68217A;
    --win-dark-purple: #4F1739;
    --win-teal: #008272;
    --win-dark-teal: #005E57;
    --win-gold: #FFB900;
    --win-dark-gold: #CC9200;
    --win-bg: #F3F3F3;
    --win-surface: #FFFFFF;
    --win-text: #000000;
    --win-text-secondary: #666666;
    --win-border: #E5E5E5;
    --win-font: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

body {
    font-family: var(--win-font);
    background-color: var(--win-bg);
    color: var(--win-text);
    line-height: 1.4;
    min-height: 100vh;
    padding: 20px;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
}

.container {
    width: 50%;
    min-width: 480px;
    max-width: 700px;
    margin: 20px auto;
    background-color: var(--win-surface);
    border: 1px solid var(--win-border);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
    overflow: hidden;
}

header {
    background-color: var(--win-blue);
    color: white;
    padding: 40px 32px;
    text-align: left;
    position: relative;
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 300px;
    height: 300px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 50%;
}

header::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: 10%;
    width: 200px;
    height: 200px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 50%;
}

header h1 {
    font-size: 32px;
    font-weight: 600;
    margin-bottom: 6px;
    letter-spacing: -0.02em;
    position: relative;
    z-index: 1;
}

.subtitle {
    font-size: 16px;
    opacity: 0.9;
    font-weight: 300;
    position: relative;
    z-index: 1;
}

main {
    padding: 24px;
}

.upload-preview-section {
    margin-bottom: 24px;
}

.upload-preview-area {
    border: 2px dashed var(--win-border);
    padding: 40px 24px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    background-color: var(--win-surface);
    position: relative;
    min-height: 280px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.upload-preview-area:hover {
    border-color: var(--win-blue);
    background-color: rgba(0, 120, 215, 0.04);
}

.upload-preview-area.dragover {
    border-color: var(--win-blue);
    background-color: rgba(0, 120, 215, 0.08);
    transform: scale(1.005);
}

.upload-preview-area.has-image {
    border-style: solid;
    padding: 12px;
    min-height: 240px;
}

.upload-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    pointer-events: none;
}

.upload-preview-area.has-image .upload-content {
    display: none;
}

.upload-icon {
    font-size: 64px;
    margin-bottom: 16px;
    opacity: 0.6;
}

.upload-content p {
    color: var(--win-text);
    font-size: 16px;
    margin: 4px 0;
    font-weight: 400;
}

.hint {
    color: var(--win-text-secondary) !important;
    font-size: 14px !important;
    margin-top: 8px;
}

.preview-image {
    max-width: 100%;
    max-height: 320px;
    object-fit: contain;
    display: none;
}

.change-image-btn {
    position: absolute;
    top: 12px;
    right: 12px;
    padding: 6px 14px;
    background-color: rgba(0, 120, 215, 0.9);
    color: white;
    border: none;
    font-family: var(--win-font);
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s ease;
    z-index: 10;
}

.change-image-btn:hover {
    background-color: var(--win-dark-blue);
    transform: translateY(-1px);
}

.file-info {
    margin-top: 16px;
    padding: 20px;
    background-color: var(--win-bg);
    border-left: 4px solid var(--win-blue);
    display: none;
    animation: slideInWin 0.2s ease;
}

.file-info.show {
    display: block;
}

@keyframes slideInWin {
    from {
        opacity: 0;
        transform: translateX(-12px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.options-section {
    margin-bottom: 24px;
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2px;
    background-color: var(--win-border);
    border: 1px solid var(--win-border);
}

.setting-item {
    background-color: var(--win-surface);
    padding: 24px 20px;
    text-align: center;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.setting-item:hover {
    filter: brightness(1.15);
}

.setting-item[data-tolerance="low"] {
    background-color: #4CAF50;
    color: white;
}

.setting-item[data-tolerance="low"] .setting-label,
.setting-item[data-tolerance="low"] .setting-value {
    color: white;
}

.setting-item[data-tolerance="medium"] {
    background-color: #FFC107;
    color: black;
}

.setting-item[data-tolerance="medium"] .setting-label,
.setting-item[data-tolerance="medium"] .setting-value {
    color: black;
}

.setting-item[data-tolerance="high"] {
    background-color: #FF5722;
    color: white;
}

.setting-item[data-tolerance="high"] .setting-label,
.setting-item[data-tolerance="high"] .setting-value {
    color: white;
}

.setting-item.animation-on {
    background-color: #9C27B0;
    color: white;
}

.setting-item.animation-on .setting-label,
.setting-item.animation-on .btn-toggle {
    border-color: white;
    color: white;
}

.setting-item.animation-on .btn-toggle.active {
    background-color: white;
    color: #9C27B0;
}

.setting-item.animation-off {
    background-color: #607D8B;
    color: white;
}

.setting-item.animation-off .setting-label,
.setting-item.animation-off .btn-toggle {
    border-color: white;
    color: white;
}

.setting-item.processing {
    background-color: #2196F3;
    color: white;
    animation: pulse-bg 2s ease-in-out infinite;
}

.setting-item.processing .setting-label,
.setting-item.processing .btn {
    color: white;
}

@keyframes pulse-bg {
    0%, 100% {
        box-shadow: inset 0 0 20px rgba(255, 255, 255, 0.2);
    }
    50% {
        box-shadow: inset 0 0 30px rgba(255, 255, 255, 0.35);
    }
}

.setting-label {
    display: block;
    color: var(--win-text-secondary);
    font-size: 14px;
    margin-bottom: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.setting-slider {
    width: 100%;
    height: 4px;
    background: var(--win-border);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    margin: 8px 0;
}

.setting-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--win-blue);
    cursor: pointer;
    transition: all 0.15s ease;
}

.setting-slider::-webkit-slider-thumb:hover {
    background: var(--win-dark-blue);
    transform: scale(1.1);
}

.setting-value {
    display: inline-block;
    margin-top: 8px;
    padding: 6px 16px;
    background-color: var(--win-blue);
    color: white;
    font-size: 14px;
    font-weight: 600;
}

.btn-toggle {
    padding: 8px 20px;
    border: 2px solid var(--win-purple);
    background-color: transparent;
    color: var(--win-purple);
    font-family: var(--win-font);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s ease;
}

.btn-toggle.active {
    background-color: var(--win-purple);
    color: white;
}

.btn-toggle:hover:not(.active) {
    background-color: rgba(104, 33, 122, 0.08);
}

.action-buttons {
    gap: 12px;
}

.action-btn-group {
    display: flex;
    flex-direction: column;
    width: 100%;
    gap: 8px;
}

.action-btn-group .btn {
    padding: 10px 16px;
    font-size: 13px;
}

.btn {
    flex: 1;
    padding: 12px 24px;
    border: none;
    font-family: var(--win-font);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    text-transform: none;
    letter-spacing: 0.02em;
}

.btn-primary {
    background-color: var(--win-blue);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--win-dark-blue);
}

.btn-primary:active:not(:disabled) {
    background-color: #004578;
}

.btn-secondary {
    background-color: var(--win-green);
    color: white;
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--win-dark-green);
}

.btn-danger {
    background-color: var(--win-red);
    color: white;
}

.btn-danger:hover:not(:disabled) {
    background-color: var(--win-dark-red);
}

.btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    transform: none !important;
}

.progress-section {
    margin-bottom: 24px;
}

.progress-stages {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.stage {
    opacity: 0.4;
    transition: all 0.3s ease;
}

.stage.active {
    opacity: 1;
}

.stage.completed {
    opacity: 0.8;
}

.stage-label {
    display: block;
    font-size: 13px;
    font-weight: 700;
    color: var(--win-text);
    margin-bottom: 8px;
    letter-spacing: 0.3px;
}

.stage .stage-label::before {
    content: '○';
    margin-right: 6px;
    font-weight: 400;
}

.stage.active .stage-label::before {
    content: '●';
    color: var(--win-blue);
}

.stage.completed .stage-label::before {
    content: '✓';
    color: var(--win-green);
}

.stage-progress {
    width: 100%;
    height: 6px;
    background-color: var(--win-border);
    overflow: hidden;
}

.stage-bar {
    height: 100%;
    width: 0%;
    transition: width 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.stage-1 .stage-bar {
    background-color: var(--win-blue);
}

.stage-2 .stage-bar {
    background-color: var(--win-purple);
    width: 0%;
    animation: stage2-loading 3000ms infinite;
}

@keyframes stage2-loading {
    0% {
        width: 0%;
        margin-left: 0%;
        animation-timing-function: cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }
    33.333% {
        width: 100%;
        margin-left: 0%;
        animation-timing-function: cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }
    66.666% {
        width: 0%;
        margin-left: 100%;
    }
    66.667% {
        width: 0%;
        margin-left: 0%;
    }
    100% {
        width: 0%;
        margin-left: 0%;
    }
}

.stage-2.active .stage-label::after {
    content: '\a (耗时取决于性能和图片大小)';
    font-size: 11px;
    font-weight: 400;
    color: var(--win-text-secondary);
    white-space: pre-wrap;
}

.completed-bar {
    background-color: var(--win-green) !important;
    animation: none !important;
    width: 100% !important;
    margin-left: 0% !important;
}

.progress-text {
    text-align: center;
    margin-top: 16px;
    color: var(--win-blue);
    font-size: 14px;
    font-weight: 600;
}

.stats-section {
    margin-bottom: 24px;
}

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

.stat-item {
    background-color: var(--win-surface);
    padding: 28px 20px;
    text-align: center;
    transition: all 0.15s ease;
}

.stat-item:hover {
    background-color: var(--win-bg);
}

.stat-label {
    display: block;
    color: var(--win-text-secondary);
    font-size: 11px;
    margin-bottom: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.stat-value {
    display: block;
    color: var(--win-blue);
    font-size: 32px;
    font-weight: 300;
}

.results-section {
    background-color: var(--win-surface);
    padding: 24px;
    border: 1px solid var(--win-border);
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 16px;
}

.results-header h3 {
    color: var(--win-text);
    font-size: 20px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.export-buttons {
    display: flex;
    gap: 12px;
    align-items: center;
}

.format-select {
    padding: 10px 16px;
    border: 1px solid var(--win-border);
    font-family: var(--win-font);
    font-size: 14px;
    cursor: pointer;
    background-color: var(--win-surface);
    color: var(--win-text);
    font-weight: 400;
    transition: all 0.15s ease;
    min-width: 160px;
}

.format-select:focus {
    outline: none;
    border-color: var(--win-blue);
}

.color-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(40px, 40px));
    gap: 4px;
    margin-bottom: 24px;
    background-color: var(--win-bg);
    padding: 4px;
}

.color-swatch {
    width: 40px;
    height: 40px;
    border-radius: 0;
    cursor: pointer;
    position: relative;
    transition: all 0.15s ease;
    opacity: 0;
    border: 2px solid transparent;
    transform-origin: center;
    background-color: rgba(218, 220, 224, 0.15) !important;
}

.color-swatch.placeholder {
    opacity: 1 !important;
    animation: none !important;
    background: repeating-linear-gradient(
        45deg,
        rgba(218, 220, 224, 0.06),
        rgba(218, 220, 224, 0.06) 4px,
        rgba(218, 220, 224, 0.09) 4px,
        rgba(218, 220, 224, 0.09) 8px
    ) !important;
    border-color: rgba(218, 220, 224, 0.3);
}

.color-swatch.placeholder .tooltip {
    display: none;
}

.color-swatch.visible {
    background-color: var(--swatch-color) !important;
}

.color-swatch.visible.animate {
    animation: tileReveal 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}

.color-swatch.visible.no-animate {
    opacity: 1;
    animation: none !important;
}

@keyframes tileReveal {
    0% {
        opacity: 0;
        transform: scale(0.5) rotateX(90deg);
    }
    60% {
        opacity: 1;
        transform: scale(1.05) rotateX(-10deg);
    }
    100% {
        opacity: 1;
        transform: scale(1) rotateX(0deg);
    }
}

.color-swatch:hover {
    transform: scale(1.15);
    border-color: var(--win-surface);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
    z-index: 10;
}

.tooltip {
    position: absolute;
    bottom: calc(100% + 10px);
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--win-surface);
    border: 1px solid var(--win-border);
    padding: 14px 18px;
    min-width: 180px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s ease;
    pointer-events: none;
    z-index: 1000;
}

.tooltip::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: var(--win-border);
}

.color-swatch:hover .tooltip {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(-4px);
}

.tooltip-color {
    font-family: 'Consolas', 'Courier New', monospace;
    font-size: 15px;
    font-weight: 700;
    color: var(--win-text);
    margin-bottom: 10px;
    text-align: center;
    letter-spacing: 0.02em;
}

.tooltip-stats {
    font-size: 13px;
    color: var(--win-text-secondary);
    line-height: 1.8;
}

.tooltip-stat {
    display: flex;
    justify-content: space-between;
    padding: 2px 0;
}

.tooltip-value {
    font-weight: 700;
    color: var(--win-blue);
}

footer {
    background-color: var(--win-bg);
    padding: 20px;
    text-align: center;
    color: var(--win-text-secondary);
    font-size: 13px;
    border-top: 2px solid var(--win-border);
    font-weight: 400;
}

.loading-spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid currentColor;
    border-radius: 0;
    border-top-color: transparent;
    animation: spinWin 0.8s linear infinite;
    margin-left: 8px;
}

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

@media (max-width: 900px) {
    .upload-preview-area {
        min-height: 240px;
    }

    .preview-image {
        max-height: 260px;
    }

    header h1 {
        font-size: 26px;
    }

    .color-grid {
        grid-template-columns: repeat(auto-fill, minmax(40px, 1fr));
        gap: 4px;
    }

    main {
        padding: 16px;
    }

    header {
        padding: 32px 24px;
    }

    body {
        padding: 12px;
    }
}

/* 平板特调 */
@media (max-width: 600px) {
    .upload-preview-area {
        min-height: 200px;
        padding: 24px 16px;
    }

    .preview-image {
        max-height: 220px;
    }

    .settings-grid {
        grid-template-columns: 1fr;
    }

    .action-buttons {
        grid-column: span 1;
    }

    .action-btn-group {
        flex-direction: row;
    }

    .color-grid {
        grid-template-columns: repeat(auto-fill, minmax(35px, 1fr));
        gap: 3px;
        padding: 3px;
    }

    .color-swatch {
        width: 100%;
        height: auto;
        aspect-ratio: 1;
    }

    .tooltip {
        min-width: 150px;
        padding: 10px 14px;
    }

    .tooltip-color {
        font-size: 13px;
    }

    .tooltip-stats {
        font-size: 12px;
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }

    .stat-value {
        font-size: 26px;
    }

    .setting-item {
        padding: 20px 16px;
    }

    .setting-label {
        font-size: 12px;
    }

    .setting-value {
        font-size: 12px;
        padding: 5px 12px;
    }
}

/* iPhone SE 特调 */
@media (max-width: 480px) {
    .container {
        width: 100%;
        min-width: auto;
        margin: 0;
        border: none;
        box-shadow: none;
    }
    
    body {
        padding: 0;
    }
    
    .settings-grid,
    .stats-grid {
        grid-template-columns: 1fr;
    }
}