/* ================================
   Design Tokens (CSS Variables)
   ================================ */
:root {
    /* Colors */
    --color-bg: #0a0a0f;
    --color-bg-elevated: #12121a;
    --color-surface: rgba(255, 255, 255, 0.03);
    --color-surface-hover: rgba(255, 255, 255, 0.06);
    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-hover: rgba(187, 134, 252, 0.4);

    --color-primary: #bb86fc;
    --color-primary-hover: #d4a5ff;
    --color-primary-glow: rgba(187, 134, 252, 0.3);

    --color-text: #e8e8ed;
    --color-text-secondary: #8a8a9a;
    --color-text-muted: #5a5a6a;

    --color-success: #4ade80;
    --color-error: #f87171;
    --color-warning: #fbbf24;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 50px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;

    /* Shadows */
    --shadow-glow: 0 0 30px var(--color-primary-glow);
}

/* ================================
   Base Styles
   ================================ */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    background: var(--color-bg);
    color: var(--color-text);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;

    /* Subtle gradient background */
    background-image:
        radial-gradient(ellipse at top, rgba(187, 134, 252, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at bottom right, rgba(99, 102, 241, 0.05) 0%, transparent 50%);
}

/* ================================
   Layout
   ================================ */
.container {
    width: 100%;
    max-width: 1400px;
    padding: var(--spacing-xl);
    text-align: center;
}

.header {
    margin-bottom: var(--spacing-lg);
}

h1 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin: 0 0 var(--spacing-sm);
    background: linear-gradient(135deg, var(--color-text), var(--color-primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--color-text-secondary);
    margin: 0;
    font-size: var(--font-size-base);
}

/* ================================
   Upload Area
   ================================ */
.upload-area {
    background: var(--color-surface);
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    backdrop-filter: blur(10px);
    margin-bottom: var(--spacing-lg);
    position: relative;
    overflow: hidden;
}

.upload-area:hover,
.upload-area:focus-visible {
    border-color: var(--color-border-hover);
    background: var(--color-surface-hover);
    box-shadow: var(--shadow-glow);
}

.upload-area:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Drag & Drop Highlight State */
.upload-area.highlight {
    border-color: var(--color-primary);
    background: rgba(187, 134, 252, 0.1);
    transform: scale(1.01);
}

.upload-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.upload-icon {
    color: var(--color-primary);
    opacity: 0.8;
    transition: transform var(--transition-base);
}

.upload-area:hover .upload-icon {
    transform: translateY(-4px);
}

.upload-text {
    margin: 0;
    font-weight: 500;
    color: var(--color-text);
}

.upload-hint {
    margin: 0;
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* Preview Container */
.preview-container {
    position: relative;
    display: inline-block;
}

/* Ensure hidden attribute works properly */
.preview-container[hidden] {
    display: none !important;
}

#preview {
    max-width: 100%;
    max-height: 200px;
    border-radius: var(--radius-md);
    display: block;
    margin: 0 auto;
    animation: fadeIn var(--transition-base);
}

/* Hide image when src is empty */
#preview[src=""],
#preview:not([src]) {
    display: none;
}

.remove-btn {
    position: absolute;
    top: -8px;
    right: -8px;
    width: 28px;
    height: 28px;
    border: none;
    border-radius: 50%;
    background: var(--color-error);
    color: white;
    font-size: var(--font-size-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-fast);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.remove-btn:hover {
    transform: scale(1.1);
}

/* ================================
   Search Button
   ================================ */
.search-btn {
    background: linear-gradient(135deg, var(--color-primary), #9333ea);
    color: white;
    border: none;
    padding: var(--spacing-md) var(--spacing-2xl);
    font-size: var(--font-size-lg);
    font-weight: 600;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    box-shadow: 0 4px 20px var(--color-primary-glow);
}

.search-btn:disabled {
    background: var(--color-border);
    color: var(--color-text-muted);
    cursor: not-allowed;
    box-shadow: none;
}

.search-btn:not(:disabled):hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px var(--color-primary-glow);
}

.search-btn:not(:disabled):active {
    transform: translateY(0);
}

.btn-icon {
    transition: transform var(--transition-fast);
}

.search-btn:not(:disabled):hover .btn-icon {
    transform: translateX(4px);
}

/* ================================
   Loading State
   ================================ */
.loading {
    margin-top: var(--spacing-xl);
    animation: fadeIn var(--transition-base);
}

.spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
}

.loading p {
    margin: 0;
    color: var(--color-text-secondary);
}

.loading-hint {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted) !important;
    margin-top: var(--spacing-xs) !important;
}

/* ================================
   Error Message
   ================================ */
.error-message {
    background: rgba(248, 113, 113, 0.1);
    border: 1px solid rgba(248, 113, 113, 0.3);
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-lg);
    margin-top: var(--spacing-lg);
    color: var(--color-error);
    font-size: var(--font-size-sm);
    animation: slideDown var(--transition-base);
}

/* ================================
   Results Grid
   ================================ */
.results-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--spacing-md);
    margin-top: var(--spacing-2xl);
}

/* Success Result Card */
.result-success {
    grid-column: 1 / -1;
    text-align: center;
    padding: var(--spacing-2xl);
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    animation: fadeIn var(--transition-base);
}

.result-success h3 {
    margin: 0 0 var(--spacing-sm);
    color: var(--color-success);
    font-size: var(--font-size-lg);
}

.result-success p {
    margin: 0 0 var(--spacing-lg);
    color: var(--color-text-secondary);
}

.result-success .search-btn {
    text-decoration: none;
    display: inline-flex;
}

.result-note {
    font-size: var(--font-size-sm);
}

.result-note a {
    color: var(--color-primary);
    text-decoration: none;
}

.result-note a:hover {
    text-decoration: underline;
}

/* Filter Container */
.filter-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-md);
    flex-wrap: wrap;
    justify-content: center;
}

.filter-input {
    flex: 1;
    min-width: 200px;
    max-width: 400px;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    font-size: var(--font-size-base);
    transition: all var(--transition-fast);
}

.filter-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px var(--color-primary-glow);
}

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

.filter-count {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    white-space: nowrap;
}

/* Iframe Container for embedded results */
.iframe-container {
    grid-column: 1 / -1;
    margin-top: var(--spacing-lg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border);
    background: white;
    animation: fadeIn var(--transition-base);
}

.iframe-container iframe {
    width: 100%;
    height: 70vh;
    min-height: 500px;
    border: none;
    display: block;
}

/* Products Container */
.products-container {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

/* Product Card with source badge */
.result-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    text-align: left;
    transition: all var(--transition-base);
    animation: fadeIn var(--transition-base);
    position: relative;
}

.result-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-glow);
}

.result-card h3 {
    font-size: var(--font-size-base);
    font-weight: 500;
    margin: var(--spacing-md) 0;
    color: var(--color-text);
    line-clamp: 2;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    display: -webkit-box;
    overflow: hidden;
}

/* Source Badge */
.source-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.source-badge.mercari {
    background: linear-gradient(135deg, #ff6b6b, #ee5a5a);
    color: white;
}

.source-badge.jdirectitems {
    background: linear-gradient(135deg, #4a90d9, #357abd);
    color: white;
}

/* Product Link Button */
.product-link {
    display: block;
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    background: linear-gradient(135deg, var(--color-primary), #9333ea);
    color: white;
    text-decoration: none;
    text-align: center;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.product-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px var(--color-primary-glow);
}

/* Lens Link Container */
.lens-link-container {
    grid-column: 1 / -1;
    text-align: center;
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.lens-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
}

.lens-link:hover {
    color: var(--color-primary);
}

/* Product Result Card */
.result-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    text-align: left;
    transition: all var(--transition-base);
    animation: fadeIn var(--transition-base);
}

.result-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-glow);
}

.result-card img {
    width: 100%;
    height: 150px;
    object-fit: cover;
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
}

.result-card h3 {
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin: var(--spacing-sm) 0;
    color: var(--color-text);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.price {
    color: var(--color-primary);
    font-weight: 600;
    font-size: var(--font-size-lg);
}

.source {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    display: block;
    margin-top: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.result-card a {
    display: block;
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--color-bg-elevated);
    color: var(--color-text);
    text-decoration: none;
    text-align: center;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    transition: background var(--transition-fast);
}

.result-card a:hover {
    background: var(--color-primary);
    color: white;
}

/* ================================
   Footer
   ================================ */
.footer {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.footer p {
    margin: 0;
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* ================================
   Animations
   ================================ */
@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ================================
   Responsive Design
   ================================ */
@media (max-width: 1200px) {

    .results-grid,
    .products-container {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (max-width: 900px) {

    .results-grid,
    .products-container {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 600px) {

    .results-grid,
    .products-container {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .container {
        padding: var(--spacing-lg);
    }

    h1 {
        font-size: var(--font-size-xl);
    }

    .upload-area {
        padding: var(--spacing-xl);
    }

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

    .results-grid,
    .products-container {
        grid-template-columns: 1fr;
    }
}

/* ================================
   Reduced Motion
   ================================ */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}