/* ===== RESET I PODSTAWY ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Kolory */
    --primary: #4f46e5;
    --primary-dark: #3730a3;
    --secondary: #7c3aed;
    --accent: #10b981;
    --accent-warning: #f59e0b;
    --accent-danger: #ef4444;

    /* Tła */
    --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --bg-white: #ffffff;
    --bg-gray-50: #f8fafc;
    --bg-gray-100: #f1f5f9;
    --bg-gray-900: #1e293b;

    /* Teksty */
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --text-white: #ffffff;

    /* Cienie */
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
    --shadow-md: 0 8px 25px rgba(0,0,0,0.1);
    --shadow-lg: 0 20px 40px rgba(0,0,0,0.1);
    --shadow-xl: 0 25px 50px rgba(0,0,0,0.15);

    /* Promienie */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 15px;
    --radius-xl: 20px;

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

    /* Typography */
    --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;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-gradient);
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.6;
}

/* ===== NAVIGATION ===== */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-brand {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    transition: transform 0.3s ease;
}

.nav-brand:hover {
    transform: scale(1.05);
}

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

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

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
    background: var(--primary);
    color: var(--text-white);
    transform: translateY(-2px);
}

.nav-link-icon {
    font-size: var(--font-size-lg);
}

/* ===== MAIN CONTENT ===== */
.main-content {
    min-height: calc(100vh - 140px);
    padding: var(--spacing-xl) var(--spacing-lg);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    background: var(--bg-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    animation: slideUp 0.6s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== HEADER SECTIONS ===== */
.header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--text-white);
    padding: var(--spacing-2xl);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: -50%;
    width: 200%;
    height: 100%;
    background: linear-gradient(45deg, transparent, rgba(255,255,255,0.1), transparent);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.header h1 {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    position: relative;
    z-index: 1;
}

.header .subtitle {
    font-size: var(--font-size-xl);
    opacity: 0.9;
    margin-bottom: var(--spacing-sm);
    position: relative;
    z-index: 1;
}

.header .meta {
    font-size: var(--font-size-base);
    opacity: 0.8;
    position: relative;
    z-index: 1;
}

/* ===== CONTENT SECTIONS ===== */
.content {
    padding: var(--spacing-2xl);
}

.section {
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-xl);
    color: var(--text-primary);
    text-align: center;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 2px;
}

/* ===== FORMS ===== */
.form-section {
    background: var(--bg-gray-50);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-xl);
    border: 1px solid rgba(0,0,0,0.05);
}

.form-title {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

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

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--text-primary);
    font-size: var(--font-size-sm);
}

.form-input,
.form-select {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid #e2e8f0;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-base);
    transition: all 0.3s ease;
    background: var(--bg-white);
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
    transform: translateY(-1px);
}

.form-input.error {
    border-color: var(--accent-danger);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

/* File upload dragover state */
.file-upload.dragover {
    border-color: var(--primary) !important;
    background: rgba(79, 70, 229, 0.1) !important;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn::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 0.5s ease;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent) 0%, #059669 100%);
    color: var(--text-white);
}

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

.btn-secondary {
    background: var(--bg-gray-100);
    color: var(--text-primary);
    border: 2px solid #e2e8f0;
}

.btn-secondary:hover {
    background: var(--bg-white);
    border-color: var(--primary);
    transform: translateY(-2px);
}

/* ===== CARDS ===== */
.card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    border: 1px solid rgba(0,0,0,0.05);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

/* ===== FILE UPLOAD ===== */
.file-upload {
    border: 2px dashed #cbd5e1;
    padding: var(--spacing-xl);
    text-align: center;
    border-radius: var(--radius-sm);
    background: var(--bg-gray-50);
    transition: all 0.3s ease;
    cursor: pointer;
}

.file-upload:hover {
    border-color: var(--primary);
    background: rgba(79, 70, 229, 0.05);
}

.file-upload input[type="file"] {
    margin-bottom: var(--spacing-sm);
}

/* ===== ALERTS ===== */
.alert {
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-lg);
    border-left: 4px solid;
}

.alert-error {
    background: #fef2f2;
    border-color: var(--accent-danger);
    color: #b91c1c;
}

.alert-success {
    background: #f0fdf4;
    border-color: var(--accent);
    color: #166534;
}

.alert-info {
    background: #eff6ff;
    border-color: var(--primary);
    color: #1e40af;
}

/* ===== API INFO ===== */
.api-info {
    background: #eff6ff;
    border: 2px solid #bfdbfe;
    padding: var(--spacing-lg);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-xl);
}

.api-info h3 {
    color: #1e40af;
    margin-bottom: var(--spacing-sm);
}

.api-info code {
    background: var(--bg-gray-900);
    color: var(--accent);
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
    display: block;
    margin: var(--spacing-sm) 0;
    overflow-x: auto;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: var(--font-size-sm);
    line-height: 1.4;
}

/* ===== LOADING ===== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    backdrop-filter: blur(8px);
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.loading-overlay.hidden {
    display: none;
}

.loading-spinner {
    text-align: center;
    color: var(--text-white);
    background: rgba(255, 255, 255, 0.1);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.spinner {
    width: 60px;
    height: 60px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top: 4px solid var(--text-white);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-spinner p {
    margin: 0;
    font-size: var(--font-size-lg);
    font-weight: 500;
}

.loading-details {
    margin-top: var(--spacing-sm);
    opacity: 0.8;
}

.loading-details small {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.9);
}

/* ===== FOOTER ===== */
.footer {
    background: rgba(30, 41, 59, 0.95);
    color: var(--text-white);
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: var(--spacing-sm);
    color: var(--accent);
}

.footer-section p {
    color: #cbd5e1;
    line-height: 1.6;
}

.footer-section code {
    background: rgba(255, 255, 255, 0.1);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: var(--font-size-sm);
}

.footer-bottom {
    text-align: center;
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #94a3b8;
}

/* ===== RESPONSIVE ===== */
/* ===== INDEX PAGE STYLES ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0 3rem;
}

.stat-card {
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    padding: 1.5rem;
    border-radius: 12px;
    text-align: center;
    border: 1px solid rgba(0,0,0,0.05);
    transition: transform 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.stat-number {
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.forms-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 3rem;
}

.form-row {
    display: grid;
    gap: 1.5rem;
}

.form-description {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.form-help {
    display: block;
    margin-top: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.label-icon {
    margin-right: 0.5rem;
}

.form-actions {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-icon {
    margin-right: 0.5rem;
}

/* File Upload Styles */
.file-upload {
    position: relative;
    cursor: pointer;
    transition: all 0.3s ease;
}

.file-upload-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.7;
}

.file-upload-text {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.file-upload-format {
    font-size: 0.875rem;
    color: var(--text-secondary);
    background: rgba(79, 70, 229, 0.1);
    padding: 0.75rem;
    border-radius: 6px;
    margin-top: 1rem;
}

.selected-file {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: var(--bg-white);
    padding: 1rem;
    border-radius: 8px;
    border: 2px solid var(--accent);
    margin-top: 1rem;
}

.selected-file.hidden {
    display: none;
}

.file-icon {
    font-size: 1.5rem;
}

.file-name {
    flex: 1;
    font-weight: 500;
}

.file-remove {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    padding: 0.25rem;
    border-radius: 4px;
    transition: background 0.3s ease;
}

.file-remove:hover {
    background: rgba(239, 68, 68, 0.1);
}

/* Features Section */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.feature-card {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(0,0,0,0.05);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.feature-list {
    list-style: none;
    margin-bottom: 1rem;
}

.feature-list li {
    padding: 0.25rem 0;
    position: relative;
    padding-left: 1.5rem;
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: bold;
}

.feature-description {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.95rem;
}

/* Examples Section */
.examples-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.example-card {
    background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 100%);
    padding: 1.5rem;
    border-radius: 12px;
    border-left: 4px solid var(--accent-warning);
}

.example-card h3 {
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.example-card p {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.95rem;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .nav-container {
        padding: 0 var(--spacing-md);
        flex-direction: column;
        height: auto;
        padding-top: var(--spacing-md);
        padding-bottom: var(--spacing-md);
    }

    .nav-links {
        margin-top: var(--spacing-sm);
    }

    .main-content {
        padding: var(--spacing-lg) var(--spacing-md);
    }

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

    .header h1 {
        font-size: var(--font-size-3xl);
    }

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

    .form-section {
        padding: var(--spacing-lg);
    }

    /* Index page responsive */
    .forms-container {
        grid-template-columns: 1fr;
    }

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

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

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

    .form-actions {
        flex-direction: column;
    }
}