:root {
    --md-sys-color-background: #fdfcff;
    --md-sys-color-on-background: #1a1c1e;
    --md-sys-color-surface: #ffffff;
    --md-sys-color-surface-variant: #e1e2e8;
    --md-sys-color-on-surface-variant: #44474f;
    --md-sys-color-primary: #0061a4;
    --md-sys-color-on-primary: #ffffff;
    --md-sys-color-primary-container: #d1e4ff;
    --md-sys-color-on-primary-container: #001d36;

    --border-radius-xl: 24px;
    --border-radius-lg: 16px;
    --border-radius-sm: 8px;
}

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

body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--md-sys-color-background);
    color: var(--md-sys-color-on-background);
    display: flex;
    justify-content: center;
    padding: 3rem 1.5rem;
    min-height: 100vh;
}

.app-container {
    max-width: 700px;
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.header {
    text-align: center;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--md-sys-color-primary);
    margin-bottom: 0.5rem;
    letter-spacing: -0.5px;
}

.header p {
    color: var(--md-sys-color-on-surface-variant);
    font-size: 1.1rem;
}

.upload-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding: 3rem 2rem;
    background-color: var(--md-sys-color-surface);
    border: 2px dashed var(--md-sys-color-primary);
    border-radius: var(--border-radius-xl);
    transition: background-color 0.3s ease;
}

.upload-section:hover {
    background-color: var(--md-sys-color-primary-container);
}

.upload-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    background-color: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary);
    padding: 1rem 2rem;
    border-radius: 50px;
    font-weight: 500;
    font-size: 1.1rem;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 0 4px 12px rgba(0, 97, 164, 0.2);
}

.upload-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 97, 164, 0.3);
}

.status-message {
    font-size: 0.9rem;
    color: var(--md-sys-color-on-surface-variant);
}

.result-section {
    background-color: var(--md-sys-color-surface);
    border-radius: var(--border-radius-xl);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.06);
    border: 1px solid var(--md-sys-color-surface-variant);
}

.image-preview {
    display: flex;
    justify-content: center;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    background-color: var(--md-sys-color-surface-variant);
}

.image-preview img {
    max-width: 100%;
    max-height: 400px;
    object-fit: contain;
    display: block;
}

.palette-container {
    background-color: var(--md-sys-color-primary-container);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    text-align: center;
}

.palette-container h3 {
    color: var(--md-sys-color-on-primary-container);
    margin-bottom: 0.25rem;
    font-size: 1.25rem;
}

.hint {
    font-size: 0.9rem;
    color: var(--md-sys-color-on-surface-variant);
    margin-bottom: 1.5rem;
}

.swatches {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.5rem;
}

.swatch-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
}

.swatch {
    width: 65px;
    height: 65px;
    border-radius: 50%;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    border: 3px solid white;
    transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.swatch-wrapper:hover .swatch {
    transform: scale(1.15);
}

.swatch-label {
    font-size: 0.85rem;
    font-family: monospace;
    font-weight: 700;
    color: var(--md-sys-color-on-primary-container);
    background: rgba(255, 255, 255, 0.7);
    padding: 4px 8px;
    border-radius: 6px;
}

.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background-color: var(--md-sys-color-on-background);
    color: var(--md-sys-color-background);
    padding: 12px 24px;
    border-radius: 50px;
    font-weight: 500;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    z-index: 1000;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}