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

body {
    background: linear-gradient(135deg, #1a2a6c, #b21f1f, #fdbb2d);
    font-family: 'Noto Sans TC', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    margin: 0;
    padding: 0;
    color: #ffffff;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-attachment: fixed;
}

.container {
    max-width: 1400px;
    width: calc(100% - 40px);
    margin: 1rem auto;
    padding: 30px;
    background-color: rgba(30, 30, 30, 0.8);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    border-radius: 15px;
    backdrop-filter: blur(5px);
}

@media (max-width: 768px) {
    .container {
        width: calc(100% - 20px);
        margin: 0.5rem auto;
        padding: 20px;
    }
}

@media (max-width: 480px) {
    .container {
        width: calc(100% - 10px);
        margin: 0.5rem auto;
        padding: 15px;
        border-radius: 10px;
    }
}

header {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 0.5rem;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
    letter-spacing: 1px;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.5rem;
    }
}

header p {
    color: #f0f0f0;
    font-size: 1rem;
    opacity: 0.9;
    line-height: 1.6;
}

@media (max-width: 480px) {
    header p {
        font-size: 0.9rem;
    }
}

main {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* 上傳區域 */
.upload-section {
    background: rgba(51, 51, 51, 0.7);
    border-radius: 15px;
    padding: 1.5rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(253, 187, 45, 0.1);
}

.upload-area {
    border: 2px dashed rgba(253, 187, 45, 0.3);
    border-radius: 12px;
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: rgba(30, 30, 30, 0.5);
}

.upload-area:hover {
    border-color: rgba(253, 187, 45, 0.6);
    background: rgba(253, 187, 45, 0.1);
    transform: scale(1.02);
}

.upload-area.dragover {
    border-color: #fdbb2d;
    background: rgba(253, 187, 45, 0.2);
    transform: scale(1.02);
}

.upload-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    color: #f0f0f0;
}

.upload-content svg {
    color: #fdbb2d;
}

.upload-content p {
    font-size: 1.1rem;
    font-weight: 500;
    color: #ffffff;
}

.upload-hint {
    font-size: 0.875rem;
    color: #e0e0e0;
    opacity: 0.8;
}

.image-info {
    margin-top: 1rem;
    padding: 0.75rem;
    background: rgba(30, 30, 30, 0.5);
    border-radius: 8px;
    font-size: 0.875rem;
    color: #f0f0f0;
    border: 1px solid rgba(253, 187, 45, 0.2);
}

/* 控制面板 */
.controls-section {
    background: rgba(51, 51, 51, 0.7);
    border-radius: 15px;
    padding: 1.5rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    border: 1px solid rgba(253, 187, 45, 0.1);
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.control-group > label {
    font-weight: 600;
    color: #ffffff;
    font-size: 0.95rem;
    position: relative;
    display: inline-block;
}

.control-group > label:after {
    content: '';
    position: absolute;
    width: 40%;
    height: 2px;
    background: linear-gradient(90deg, #fdbb2d, transparent);
    bottom: -5px;
    left: 0;
}

.dimension-controls {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.preset-ratios {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.ratio-btn {
    padding: 0.5rem 1rem;
    border: 1px solid rgba(253, 187, 45, 0.3);
    background: rgba(253, 187, 45, 0.1);
    border-radius: 50px;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.3s ease;
    color: #fdbb2d;
}

.ratio-btn:hover {
    border-color: rgba(253, 187, 45, 0.6);
    background: rgba(253, 187, 45, 0.2);
    transform: scale(1.05);
    box-shadow: 0 3px 10px rgba(253, 187, 45, 0.2);
}

.ratio-btn.active {
    background: rgba(253, 187, 45, 0.3);
    color: #ffffff;
    border-color: #fdbb2d;
    box-shadow: 0 3px 10px rgba(253, 187, 45, 0.3);
}

.custom-dimensions {
    padding-top: 1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.dimension-input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.dimension-input-group > label {
    font-size: 0.875rem;
    color: #e0e0e0;
    font-weight: 500;
}

.input-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.input-row input {
    flex: 1;
    padding: 0.5rem;
    border: 1px solid rgba(253, 187, 45, 0.3);
    border-radius: 6px;
    font-size: 0.875rem;
    background: rgba(30, 30, 30, 0.5);
    color: #ffffff;
}

.input-row input:focus {
    outline: none;
    border-color: #fdbb2d;
    box-shadow: 0 0 0 3px rgba(253, 187, 45, 0.2);
}

.input-row span {
    color: #f0f0f0;
    font-size: 0.875rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.875rem;
    color: #e0e0e0;
}

.checkbox-label input[type="checkbox"] {
    cursor: pointer;
}

.mode-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 0.5rem;
}

.mode-btn {
    padding: 0.75rem 1rem;
    border: 1px solid rgba(253, 187, 45, 0.3);
    background: rgba(253, 187, 45, 0.1);
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.3s ease;
    color: #fdbb2d;
}

.mode-btn:hover {
    border-color: rgba(253, 187, 45, 0.6);
    background: rgba(253, 187, 45, 0.2);
    transform: translateY(-2px);
    box-shadow: 0 3px 10px rgba(253, 187, 45, 0.2);
}

.mode-btn.active {
    background: rgba(253, 187, 45, 0.3);
    color: #ffffff;
    border-color: #fdbb2d;
    box-shadow: 0 3px 10px rgba(253, 187, 45, 0.3);
}

.advanced-controls {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.color-picker-group,
.blur-control-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.color-picker-group label,
.blur-control-group label {
    font-size: 0.875rem;
    color: #e0e0e0;
    min-width: 80px;
}

.color-picker-group input[type="color"] {
    width: 50px;
    height: 40px;
    border: 1px solid rgba(253, 187, 45, 0.3);
    border-radius: 6px;
    cursor: pointer;
}

.color-picker-group input[type="text"] {
    flex: 1;
    padding: 0.5rem;
    border: 1px solid rgba(253, 187, 45, 0.3);
    border-radius: 6px;
    font-size: 0.875rem;
    font-family: monospace;
    background: rgba(30, 30, 30, 0.5);
    color: #ffffff;
}

.color-picker-group input[type="text"]:focus {
    outline: none;
    border-color: #fdbb2d;
    box-shadow: 0 0 0 3px rgba(253, 187, 45, 0.2);
}

.blur-control-group input[type="range"] {
    flex: 1;
    height: 6px;
    border-radius: 3px;
    background: rgba(255, 255, 255, 0.2);
    outline: none;
    -webkit-appearance: none;
}

.blur-control-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: #fdbb2d;
    cursor: pointer;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
}

.blur-control-group input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: #fdbb2d;
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
}

.blur-control-group span {
    min-width: 30px;
    text-align: right;
    font-size: 0.875rem;
    color: #fdbb2d;
    font-weight: 500;
}

/* 預覽區域 */
.preview-section {
    background: rgba(51, 51, 51, 0.7);
    border-radius: 15px;
    padding: 1.5rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(253, 187, 45, 0.1);
}

.preview-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

#previewCanvas {
    max-width: 100%;
    height: auto;
    border: 1px solid rgba(253, 187, 45, 0.3);
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    background: 
        repeating-conic-gradient(rgba(51, 51, 51, 0.5) 0% 25%, rgba(30, 30, 30, 0.5) 0% 50%) 
        50% / 20px 20px;
}

.canvas-info {
    font-size: 0.875rem;
    color: #f0f0f0;
    text-align: center;
}

/* 下載區域 */
.download-section {
    background: rgba(51, 51, 51, 0.7);
    border-radius: 15px;
    padding: 1.5rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(253, 187, 45, 0.1);
}

.download-controls {
    display: flex;
    gap: 1rem;
    align-items: center;
    justify-content: center;
}

.download-controls select {
    padding: 0.75rem 1rem;
    border: 1px solid rgba(253, 187, 45, 0.3);
    border-radius: 8px;
    background: rgba(30, 30, 30, 0.5);
    font-size: 0.875rem;
    cursor: pointer;
    color: #ffffff;
}

.download-controls select:focus {
    outline: none;
    border-color: #fdbb2d;
    box-shadow: 0 0 0 3px rgba(253, 187, 45, 0.2);
}

.download-btn {
    padding: 0.75rem 2rem;
    background: rgba(253, 187, 45, 0.3);
    color: #ffffff;
    border: 1px solid #fdbb2d;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.download-btn:hover:not(:disabled) {
    background: rgba(253, 187, 45, 0.5);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(253, 187, 45, 0.3);
}

.download-btn:disabled {
    background: rgba(51, 51, 51, 0.5);
    color: rgba(255, 255, 255, 0.3);
    border-color: rgba(253, 187, 45, 0.2);
    cursor: not-allowed;
}

/* Footer */
.footer {
    text-align: center;
    padding: 25px 0;
    background-color: rgba(25, 25, 25, 0.8);
    color: #ffffff;
    border-radius: 0 0 15px 15px;
    margin-top: 30px;
}

@media (max-width: 480px) {
    .footer {
        padding: 20px 0;
        margin-top: 20px;
    }
}

.footer .social-links {
    margin-bottom: 15px;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

.footer a {
    color: #ffffff;
    margin: 0 12px;
    text-decoration: none;
    font-size: 26px;
    display: inline-block;
    transition: transform 0.3s ease, color 0.3s ease;
}

@media (max-width: 480px) {
    .footer a {
        font-size: 22px;
        margin: 0 10px 10px;
    }
}

.footer a:hover {
    color: #fdbb2d;
    transform: scale(1.2);
}

.footer p {
    font-size: 14px;
    opacity: 0.7;
}

@media (max-width: 480px) {
    .footer p {
        font-size: 12px;
    }
}

/* 響應式設計 */
@media (max-width: 768px) {
    .mode-buttons {
        grid-template-columns: repeat(2, 1fr);
    }

    .download-controls {
        flex-direction: column;
    }

    .download-btn {
        width: 100%;
    }
}