/* ========================================
   JSON to Excel Converter - Styles
   ======================================== */

/* CSS Custom Properties */
:root {
    /* Colors */
    --color-bg: #0a0a0f;
    --color-bg-secondary: #12121a;
    --color-bg-card: rgba(18, 18, 26, 0.8);
    --color-bg-elevated: rgba(30, 30, 45, 0.6);

    --color-primary: #6366f1;
    --color-primary-light: #818cf8;
    --color-primary-dark: #4f46e5;

    --color-accent: #22d3ee;
    --color-accent-secondary: #a855f7;

    --color-success: #10b981;
    --color-error: #ef4444;
    --color-warning: #f59e0b;

    --color-text: #f1f5f9;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #64748b;

    --color-border: rgba(99, 102, 241, 0.2);
    --color-border-hover: rgba(99, 102, 241, 0.4);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent-secondary) 100%);
    --gradient-glow: radial-gradient(ellipse at center, rgba(99, 102, 241, 0.15) 0%, transparent 70%);

    /* 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: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3.5rem;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.3);

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

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    min-height: 100vh;
    overflow-x: hidden;
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ========================================
   Header
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    font-weight: 700;
    font-size: var(--font-size-xl);
}

.logo-icon {
    font-size: var(--font-size-2xl);
}

.logo-text {
    color: var(--color-text);
}

.logo-text .highlight {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav {
    display: flex;
    gap: var(--spacing-xl);
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-text);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    position: relative;
    padding: calc(70px + var(--spacing-3xl)) 0 var(--spacing-3xl);
    text-align: center;
    overflow: hidden;
}

.hero-glow {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    height: 100%;
    background: var(--gradient-glow);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: clamp(var(--font-size-3xl), 5vw, var(--font-size-5xl));
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
}

.hero-badges {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

/* ========================================
   Converter Section
   ======================================== */
.converter-section {
    padding: var(--spacing-2xl) 0 var(--spacing-3xl);
}

.converter-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-2xl);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
}

.section-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
}

.step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 700;
}

/* Input Methods */
.input-methods {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

@media (max-width: 768px) {
    .input-methods {
        grid-template-columns: 1fr;
    }
}

/* Upload Zone */
.upload-zone {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 200px;
    padding: var(--spacing-xl);
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-xl);
    background: var(--color-bg-elevated);
    cursor: pointer;
    transition: all var(--transition-base);
}

.upload-zone:hover,
.upload-zone:focus {
    border-color: var(--color-primary);
    background: rgba(99, 102, 241, 0.05);
}

.upload-zone.drag-over {
    border-color: var(--color-accent);
    background: rgba(34, 211, 238, 0.1);
    transform: scale(1.02);
}

.file-input {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}

.upload-icon {
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    animation: float 3s ease-in-out infinite;
}

@keyframes float {

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

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

.upload-text {
    font-weight: 600;
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xs);
}

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

/* Divider */
.divider {
    display: flex;
    align-items: center;
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

@media (max-width: 768px) {
    .divider {
        justify-content: center;
        padding: var(--spacing-md) 0;
    }

    .divider::before,
    .divider::after {
        content: '';
        flex: 1;
        height: 1px;
        background: var(--color-border);
        margin: 0 var(--spacing-md);
    }
}

/* Paste Area */
.paste-area {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.json-textarea {
    width: 100%;
    min-height: 200px;
    padding: var(--spacing-md);
    background: var(--color-bg-elevated);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text);
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: var(--font-size-sm);
    resize: vertical;
    transition: border-color var(--transition-fast);
}

.json-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}

.json-textarea::placeholder {
    color: var(--color-text-muted);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-lg);
    font-family: inherit;
    font-size: var(--font-size-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
    background: var(--color-bg-elevated);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    border-color: var(--color-primary);
    background: rgba(99, 102, 241, 0.1);
}

.btn-ghost {
    background: transparent;
    color: var(--color-text-secondary);
}

.btn-ghost:hover {
    color: var(--color-text);
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-2xl);
    font-size: var(--font-size-base);
}

/* Error Message */
.error-message {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--color-error);
    border-radius: var(--radius-md);
    color: var(--color-error);
    font-size: var(--font-size-sm);
}

/* Reorder Area */
.reorder-area {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-2xl);
    border-top: 1px solid var(--color-border);
}

.reorder-hint {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-md);
}

.column-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.column-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: grab;
    user-select: none;
    transition: all var(--transition-fast);
}

.column-item:hover {
    border-color: var(--color-primary);
    background: rgba(99, 102, 241, 0.1);
}

.column-item.dragging {
    opacity: 0.5;
    cursor: grabbing;
}

.column-item.drag-over {
    border-color: var(--color-accent);
    background: rgba(34, 211, 238, 0.1);
    transform: scale(1.05);
}

.drag-handle {
    color: var(--color-text-muted);
}

.column-name {
    font-size: var(--font-size-sm);
    font-weight: 500;
}

/* Download Area */
.download-area {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-2xl);
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.download-info {
    display: flex;
    justify-content: center;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-xl);
}

.info-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.info-label {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.info-value {
    font-weight: 700;
    font-size: var(--font-size-lg);
    color: var(--color-primary-light);
}

/* Preview Area */
.preview-area {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-2xl);
    border-top: 1px solid var(--color-border);
}

.preview-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.preview-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-sm);
}

.preview-table th,
.preview-table td {
    padding: var(--spacing-sm) var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--color-border);
    white-space: nowrap;
}

.preview-table th {
    background: var(--color-bg-elevated);
    font-weight: 600;
    color: var(--color-primary-light);
}

.preview-table tbody tr:hover {
    background: rgba(99, 102, 241, 0.05);
}

/* ========================================
   Features Section
   ======================================== */
.features-section {
    padding: var(--spacing-3xl) 0;
    background: var(--color-bg-secondary);
}

.features-title {
    text-align: center;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-3xl);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.feature-card {
    padding: var(--spacing-xl);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.feature-card h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.feature-card p {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.7;
}

/* ========================================
   How to Use Section (SEO Content)
   ======================================== */
.how-to-section {
    padding: var(--spacing-3xl) 0;
}

.how-to-title {
    text-align: center;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-2xl);
}

.how-to-content {
    max-width: 800px;
    margin: 0 auto;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
}

.how-to-content h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
    color: var(--color-primary-light);
}

.how-to-content h3:first-child {
    margin-top: 0;
}

.how-to-content p {
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.how-to-content strong {
    color: var(--color-text);
}

.how-to-steps {
    list-style: none;
    counter-reset: step-counter;
    padding-left: 0;
    margin: var(--spacing-lg) 0;
}

.how-to-steps li {
    counter-increment: step-counter;
    position: relative;
    padding-left: var(--spacing-2xl);
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.how-to-steps li::before {
    content: counter(step-counter);
    position: absolute;
    left: 0;
    top: 0;
    width: 24px;
    height: 24px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xs);
    font-weight: 700;
    color: white;
}

.format-list {
    list-style: none;
    padding-left: 0;
    margin: var(--spacing-md) 0;
}

.format-list li {
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
    position: relative;
    color: var(--color-text-secondary);
}

.format-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-success);
}

.how-to-content code {
    background: var(--color-bg-elevated);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-family: 'Monaco', 'Menlo', monospace;
    font-size: var(--font-size-sm);
    color: var(--color-accent);
}

/* ========================================
   FAQ Section
   ======================================== */
.faq-section {
    padding: var(--spacing-3xl) 0;
}

.faq-title {
    text-align: center;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-3xl);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.faq-item {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-fast);
}

.faq-item:hover {
    border-color: var(--color-border-hover);
}

.faq-item[open] {
    border-color: var(--color-primary);
}

.faq-question {
    padding: var(--spacing-lg);
    font-weight: 600;
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-question::-webkit-details-marker {
    display: none;
}

.faq-question::after {
    content: '+';
    font-size: var(--font-size-xl);
    color: var(--color-primary);
    transition: transform var(--transition-fast);
}

.faq-item[open] .faq-question::after {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.faq-answer code {
    background: var(--color-bg-elevated);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-family: 'Monaco', 'Menlo', monospace;
    font-size: var(--font-size-sm);
}

/* ========================================
   Footer
   ======================================== */
.footer {
    padding: var(--spacing-2xl) 0;
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    text-align: center;
}

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

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-lg);
    font-weight: 700;
}

.footer-text {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    max-width: 400px;
}

.footer-copyright {
    color: var(--color-text-muted);
    font-size: var(--font-size-xs);
}

/* ========================================
   Responsive Adjustments
   ======================================== */
@media (max-width: 640px) {
    .nav {
        display: none;
    }

    .hero-title {
        font-size: var(--font-size-3xl);
    }

    .converter-card {
        padding: var(--spacing-lg);
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .download-info {
        flex-direction: column;
        gap: var(--spacing-md);
    }
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

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

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

.converter-card {
    animation: fadeIn 0.6s ease-out;
}

.feature-card {
    animation: fadeIn 0.6s ease-out;
    animation-fill-mode: both;
}

.feature-card:nth-child(1) {
    animation-delay: 0.1s;
}

.feature-card:nth-child(2) {
    animation-delay: 0.2s;
}

.feature-card:nth-child(3) {
    animation-delay: 0.3s;
}

.feature-card:nth-child(4) {
    animation-delay: 0.4s;
}

.feature-card:nth-child(5) {
    animation-delay: 0.5s;
}

.feature-card:nth-child(6) {
    animation-delay: 0.6s;
}
/* Social Sharing Buttons */
.social-share {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.social-label {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.social-buttons {
    display: flex;
    gap: var(--spacing-md);
}

.social-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
    text-decoration: none;
}

.social-btn:hover {
    transform: translateY(-2px);
    border-color: transparent;
}

.social-twitter:hover {
    background: #000000;
    color: white;
}

.social-linkedin:hover {
    background: #0A66C2;
    color: white;
}

.social-facebook:hover {
    background: #1877F2;
    color: white;
}

/* Footer Navigation */
.footer-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.footer-nav a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
}

.footer-nav a:hover {
    color: var(--color-primary-light);
}