/* Reset & Base */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-bg: #fafafa;
    --color-surface: #ffffff;
    --color-text: #1a1a1a;
    --color-text-muted: #6b7280;
    --color-border: #e5e7eb;
    --color-primary: #2d3a2d;
    --color-primary-hover: #3d4d3d;
    --color-accent: #86efac;
    --color-error: #ef4444;
    --color-error-bg: #fef2f2;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-full: 9999px;
    --transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    font-size: 16px;
}

body {
    font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    min-height: 100vh;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Layout */
.container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.content {
    width: 100%;
    max-width: 680px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

/* Typography */
.title {
    font-size: 1.75rem;
    font-weight: 600;
    text-align: center;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

/* Input Section */
.input-section {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.input-wrapper {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    padding: 0.5rem;
    box-shadow: var(--shadow-md);
    transition: box-shadow var(--transition), border-color var(--transition);
}

.input-wrapper:focus-within {
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.upload-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border: none;
    border-radius: 50%;
    background: transparent;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: color var(--transition), background var(--transition);
    flex-shrink: 0;
}

.upload-btn:hover {
    color: var(--color-primary);
    background: rgba(45, 58, 45, 0.08);
}

.upload-btn.has-image {
    color: var(--color-primary);
    background: var(--color-accent);
}

.input-field {
    flex: 1;
    border: none;
    outline: none;
    font-size: 1rem;
    font-family: inherit;
    background: transparent;
    color: var(--color-text);
    min-width: 0;
}

.input-field::placeholder {
    color: var(--color-text-muted);
}

.submit-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border: none;
    border-radius: 50%;
    background: var(--color-primary);
    color: white;
    cursor: pointer;
    transition: background var(--transition), transform var(--transition);
    flex-shrink: 0;
}

.submit-btn:hover {
    background: var(--color-primary-hover);
}

.submit-btn:active {
    transform: scale(0.95);
}

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

/* Image Preview */
.image-preview-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0 0.5rem;
    animation: fadeIn 0.2s ease-out;
}

.image-preview-wrapper {
    position: relative;
    width: 56px;
    height: 56px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 1px solid var(--color-border);
    flex-shrink: 0;
}

.image-preview-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.remove-image-btn {
    position: absolute;
    top: -6px;
    right: -6px;
    width: 22px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-text);
    color: white;
    border: 2px solid var(--color-surface);
    border-radius: 50%;
    cursor: pointer;
    transition: background var(--transition), transform var(--transition);
}

.remove-image-btn:hover {
    background: var(--color-error);
    transform: scale(1.1);
}

.image-preview-hint {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

/* Loading State */
.loading-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding: 3rem 0;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loading-text {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* Error State */
.error-container {
    width: 100%;
    padding: 1rem 1.5rem;
    background: var(--color-error-bg);
    border: 1px solid var(--color-error);
    border-radius: var(--radius-md);
}

.error-message {
    color: var(--color-error);
    font-size: 0.875rem;
    text-align: center;
}

/* Results Section */
.results-container {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.images-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    width: 100%;
}

.image-wrapper {
    position: relative;
    aspect-ratio: 1;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform var(--transition);
}

.image-wrapper:hover img {
    transform: scale(1.02);
}

.download-btn {
    position: absolute;
    bottom: 0.75rem;
    right: 0.75rem;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.95);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    opacity: 0;
    transform: translateY(4px);
    transition: opacity var(--transition), transform var(--transition), background var(--transition);
    color: var(--color-text);
}

.image-wrapper:hover .download-btn {
    opacity: 1;
    transform: translateY(0);
}

.download-btn:hover {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.download-btn:active {
    transform: scale(0.95);
}

/* Repeat Button */
.repeat-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.5rem;
    font-size: 0.9375rem;
    font-weight: 500;
    font-family: inherit;
    color: var(--color-text);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition);
}

.repeat-btn:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
}

.repeat-btn:active {
    transform: scale(0.98);
}

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

/* Login Modal */
.modal {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg);
    z-index: 1000;
    padding: 1rem;
}

.modal.hidden {
    display: none !important;
}

.modal-content {
    width: 100%;
    max-width: 360px;
    background: var(--color-surface);
    border-radius: var(--radius-md);
    padding: 2rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border);
}

.modal-title {
    font-size: 1.5rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 1.5rem;
    color: var(--color-text);
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

.form-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text);
}

.form-group input {
    padding: 0.75rem 1rem;
    font-size: 1rem;
    font-family: inherit;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-surface);
    color: var(--color-text);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(45, 58, 45, 0.1);
}

.password-hint {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-top: 0.5rem;
}

.login-error {
    color: var(--color-error);
    font-size: 0.875rem;
    text-align: center;
    padding: 0.5rem;
    background: var(--color-error-bg);
    border-radius: var(--radius-sm);
}

.login-btn {
    margin-top: 0.5rem;
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    font-family: inherit;
    color: white;
    background: var(--color-primary);
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background var(--transition), transform var(--transition);
}

.login-btn:hover {
    background: var(--color-primary-hover);
}

.login-btn:active {
    transform: scale(0.98);
}

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

/* Utility Classes */
.hidden {
    display: none !important;
}

/* Responsive */
@media (max-width: 640px) {
    .container {
        padding: 1.5rem 1rem;
        align-items: flex-start;
        padding-top: 4rem;
    }

    .title {
        font-size: 1.5rem;
    }

    .images-grid {
        gap: 0.75rem;
    }

    .image-wrapper {
        border-radius: var(--radius-sm);
    }

    .download-btn {
        opacity: 1;
        transform: translateY(0);
        width: 32px;
        height: 32px;
    }

    .repeat-btn {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 400px) {
    .content {
        gap: 1.5rem;
    }

    .title {
        font-size: 1.25rem;
    }

    .input-wrapper {
        padding: 0.375rem;
    }

    .input-field {
        font-size: 0.9375rem;
    }

    .submit-btn,
    .upload-btn {
        width: 40px;
        height: 40px;
    }

    .image-preview-wrapper {
        width: 48px;
        height: 48px;
    }
}