/* ================================================== */
/* CSS Variables & Design System                     */
/* ================================================== */

:root {
    /* Colors - Premium Palette */
    --color-primary: hsl(250, 84%, 54%);
    --color-primary-light: hsl(250, 84%, 64%);
    --color-primary-dark: hsl(250, 84%, 44%);
    --color-success: hsl(142, 71%, 45%);
    --color-success-light: hsl(142, 71%, 95%);
    --color-error: hsl(0, 84%, 60%);
    --color-error-light: hsl(0, 84%, 95%);
    --color-warning: hsl(38, 92%, 50%);
    --color-warning-light: hsl(38, 92%, 95%);

    /* Neutrals */
    --color-bg: hsl(240, 10%, 8%);
    --color-bg-secondary: hsl(240, 8%, 12%);
    --color-bg-tertiary: hsl(240, 6%, 16%);
    --color-surface: hsl(240, 6%, 20%);
    --color-border: hsl(240, 6%, 24%);
    --color-text: hsl(0, 0%, 95%);
    --color-text-secondary: hsl(0, 0%, 70%);
    --color-text-tertiary: hsl(0, 0%, 50%);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

/* ================================================== */
/* Reset & Base Styles                               */
/* ================================================== */

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, var(--color-bg) 0%, hsl(250, 20%, 10%) 100%);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ================================================== */
/* Layout                                            */
/* ================================================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xl);
}

/* ================================================== */
/* Header                                            */
/* ================================================== */

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo-icon {
    width: 40px;
    height: 40px;
    color: var(--color-primary);
    filter: drop-shadow(0 0 10px rgba(99, 102, 241, 0.5));
}

.logo h1 {
    font-size: 1.75rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.version {
    background: var(--color-surface);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
}

/* ================================================== */
/* Main Content                                      */
/* ================================================== */

.main-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

/* ================================================== */
/* Upload Section                                    */
/* ================================================== */

.upload-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.upload-card {
    background: var(--color-bg-secondary);
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    text-align: center;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.upload-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.05), rgba(139, 92, 246, 0.05));
    opacity: 0;
    transition: opacity var(--transition-base);
}

.upload-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
}

.upload-card:hover::before {
    opacity: 1;
}

.upload-card.drag-over {
    border-color: var(--color-primary);
    background: var(--color-bg-tertiary);
    box-shadow: var(--shadow-glow);
}

.upload-card.drag-over::before {
    opacity: 1;
}

.upload-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-lg);
    color: var(--color-primary);
    animation: float 3s ease-in-out infinite;
}

.upload-icon svg {
    width: 100%;
    height: 100%;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

.upload-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.upload-subtitle {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    font-size: 1rem;
}

/* ================================================== */
/* Buttons                                           */
/* ================================================== */

.btn-primary,
.btn-validate {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.btn-primary::before,
.btn-validate::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left var(--transition-slow);
}

.btn-primary:hover,
.btn-validate:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md), var(--shadow-glow);
}

.btn-primary:hover::before,
.btn-validate:hover::before {
    left: 100%;
}

.btn-primary:active,
.btn-validate:active {
    transform: translateY(0);
}

.btn-validate {
    width: 100%;
    justify-content: center;
    margin-top: var(--spacing-md);
}

.btn-icon {
    width: 20px;
    height: 20px;
}

.btn-remove {
    background: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-remove:hover {
    background: var(--color-error);
    border-color: var(--color-error);
    color: white;
    transform: rotate(90deg);
}

.btn-remove svg {
    width: 18px;
    height: 18px;
}

/* ================================================== */
/* File List                                         */
/* ================================================== */

.file-list-container {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    animation: slideIn var(--transition-base);
}

.file-list-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

.file-list-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
}

.btn-clear-all {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-clear-all:hover {
    background: var(--color-error);
    border-color: var(--color-error);
    color: white;
}

.btn-clear-all svg {
    width: 14px;
    height: 14px;
}

.file-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    max-height: 300px;
    overflow-y: auto;
}

.file-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

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

.file-item .file-icon {
    width: 32px;
    height: 32px;
    color: var(--color-primary);
    flex-shrink: 0;
}

.file-item .file-details {
    flex: 1;
    min-width: 0;
}

.file-item .file-details.clickable {
    cursor: pointer;
}

.file-item .file-details.clickable:hover h4 {
    color: var(--color-primary);
    text-decoration: underline;
}

.file-item .file-details h4 {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-item .file-details span {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

.file-item .file-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.75rem;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
}

.file-item .file-status.pending {
    background: var(--color-bg);
    color: var(--color-text-secondary);
}

.file-item .file-status.validating {
    background: rgba(99, 102, 241, 0.1);
    color: var(--color-primary);
}

.file-item .file-status.valid {
    background: rgba(16, 185, 129, 0.1);
    color: var(--color-success);
}

.file-item .file-status.invalid {
    background: rgba(239, 68, 68, 0.1);
    color: var(--color-error);
}

.file-item .btn-remove-file {
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
    width: 28px;
    height: 28px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.file-item .btn-remove-file:hover {
    background: var(--color-error);
    color: white;
}

.file-item .btn-remove-file svg {
    width: 14px;
    height: 14px;
}

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

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

/* ================================================== */
/* File Info (legacy, kept for compatibility)        */
/* ================================================== */

.file-info {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    animation: slideIn var(--transition-base);
}

.file-info-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.file-icon {
    width: 48px;
    height: 48px;
    color: var(--color-primary);
    flex-shrink: 0;
}

.file-details {
    flex: 1;
}

.file-details h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
    word-break: break-all;
}

.file-details p {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

/* ================================================== */
/* Results Section                                   */
/* ================================================== */

.results-section {
    animation: slideIn var(--transition-base);
}

.results-card {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.results-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.status-icon {
    width: 64px;
    height: 64px;
    flex-shrink: 0;
    animation: scaleIn var(--transition-slow);
}

@keyframes scaleIn {
    from {
        transform: scale(0);
        opacity: 0;
    }

    to {
        transform: scale(1);
        opacity: 1;
    }
}

.status-icon svg {
    width: 100%;
    height: 100%;
}

.status-icon.success {
    color: var(--color-success);
    filter: drop-shadow(0 0 10px rgba(34, 197, 94, 0.5));
}

.status-icon.error {
    color: var(--color-error);
    filter: drop-shadow(0 0 10px rgba(239, 68, 68, 0.5));
}

.results-title h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.results-title p {
    color: var(--color-text-secondary);
    font-size: 1rem;
}

.results-body {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

/* Success Message */
.success-message {
    background: var(--color-success-light);
    border: 1px solid var(--color-success);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    color: var(--color-success);
    font-weight: 500;
}

/* Error List */
.error-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* File Errors Group */
.file-errors {
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
}

.file-errors-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

.file-errors-header strong {
    color: var(--color-text);
    font-size: 0.95rem;
}

.file-errors-header .error-count {
    background: rgba(239, 68, 68, 0.1);
    color: var(--color-error);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
}

.file-errors .error-item {
    margin-bottom: var(--spacing-sm);
}

.file-errors .error-item:last-child {
    margin-bottom: 0;
}

.file-errors.highlight {
    animation: highlightPulse 1.5s ease-out;
}

@keyframes highlightPulse {
    0% {
        box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.6);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(99, 102, 241, 0);
    }
}

.error-item {
    background: var(--color-bg-tertiary);
    border-left: 4px solid var(--color-error);
    border-radius: var(--radius-sm);
    padding: var(--spacing-md);
    transition: all var(--transition-fast);
}

.error-item:hover {
    background: var(--color-surface);
    transform: translateX(4px);
}

.error-item-header {
    display: flex;
    align-items: start;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.error-icon {
    width: 20px;
    height: 20px;
    color: var(--color-error);
    flex-shrink: 0;
    margin-top: 2px;
}

.error-title {
    font-weight: 600;
    color: var(--color-text);
    flex: 1;
}

.error-message {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    margin-left: 28px;
    line-height: 1.5;
}

.error-location {
    display: inline-block;
    background: var(--color-surface);
    padding: 2px var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-family: 'Courier New', monospace;
    margin-top: var(--spacing-xs);
    color: var(--color-text-tertiary);
}

/* ================================================== */
/* Schema Info                                       */
/* ================================================== */

.schema-info {
    margin-top: var(--spacing-xl);
}

.info-card {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
}

.info-card h3 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.info-icon {
    width: 24px;
    height: 24px;
    color: var(--color-primary);
}

.info-card p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

.feature-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    color: var(--color-text);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.feature-list li:hover {
    background: var(--color-bg-tertiary);
    transform: translateX(4px);
}

.check-icon {
    width: 20px;
    height: 20px;
    color: var(--color-success);
    flex-shrink: 0;
}

.btn-download {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-primary-light);
    color: white;
    border: 1px solid var(--color-primary-light);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-base);
    margin-top: var(--spacing-lg);
}

.btn-download:hover {
    background: var(--color-primary);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.btn-download .btn-icon {
    width: 18px;
    height: 18px;
}

/* ================================================== */
/* Footer                                            */
/* ================================================== */

.footer {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
    text-align: center;
    color: var(--color-text-tertiary);
    font-size: 0.875rem;
}

.footer .developer-credit {
    margin-top: var(--spacing-xs);
    color: var(--color-text-secondary);
}

.footer .developer-credit a {
    color: var(--color-primary-light);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer .developer-credit a:hover {
    color: var(--color-primary);
    text-decoration: underline;
}

/* ================================================== */
/* Responsive Design                                 */
/* ================================================== */

.results-actions {
    margin-top: 2rem;
    display: flex;
    justify-content: center;
    border-top: 1px solid var(--border-color);
    padding-top: 1.5rem;
}

.btn-secondary {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background-color: var(--color-bg-tertiary);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-secondary:hover {
    background-color: var(--color-surface);
    border-color: var(--color-text-secondary);
    transform: translateY(-2px);
}

@media (max-width: 640px) {
    .container {
        padding: 1rem;
    }

    .upload-card {
        padding: 2rem 1rem;
    }
}

@media (max-width: 768px) {
    .container {
        padding: var(--spacing-md);
    }

    .header {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }

    .logo {
        flex-direction: column;
    }

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

    .upload-icon {
        width: 60px;
        height: 60px;
    }

    .upload-title {
        font-size: 1.25rem;
    }

    .results-header {
        flex-direction: column;
        text-align: center;
    }
}

/* ================================================== */
/* Loading Animation                                 */
/* ================================================== */

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    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);
    }
}