/* ==========================================
   DESIGN SYSTEM - Common Styles
   ========================================== */

/* CSS Variables */
:root {
    /* Colors */
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #16a34a;
    --error-color: #dc2626;
    --warning-color: #ca8a04;

    /* Backgrounds */
    --background: #f8fafc;
    --card-bg: #ffffff;

    /* Text */
    --text-primary: #1e293b;
    --text-secondary: #64748b;

    /* Borders */
    --border-color: #e2e8f0;
    --border-radius: 12px;

    /* Code */
    --code-bg: #1e293b;
    --code-text: #e2e8f0;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 10px rgba(0, 0, 0, 0.05);

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

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

/* Base Styles */
body {
    margin: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
}

/* Typography */
h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

/* Links */
a {
    color: var(--primary-color);
    text-decoration: none;
    transition: all 0.2s ease;
}

a:hover {
    text-decoration: underline;
}

/* ==========================================
   LAYOUT COMPONENTS
   ========================================== */

/* Header */
header {
    background: linear-gradient(135deg, #1e3a8a, #2563eb);
    color: white;
    padding: 2rem 1rem;
    text-align: center;
}

header .header-logo {
    display: block;
    width: 160px;
    height: auto;
    margin: 0 auto 0.75rem auto;
}

header p {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.95);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.5;
}

/* Main Content */
main {
    max-width: 900px;
    margin: 3rem auto;
    padding: 0 1rem;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-xl);
}

/* Page Title */
.page-title {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.page-title h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.page-title .subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Footer */
footer {
    text-align: center;
    padding: var(--spacing-xl) 1rem;
    border-top: 1px solid var(--border-color);
}

footer p,
footer .copyright {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

footer .powered-by {
    font-size: 0.75rem;
    color: var(--text-secondary);
    opacity: 0.7;
    font-style: italic;
}

footer .links {
    margin-top: var(--spacing-sm);
    font-size: 0.85rem;
}

footer .links a {
    color: var(--text-secondary);
}

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

/* ==========================================
   CARD SYSTEM (Unified)
   ========================================== */

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

.card h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.card .description {
    font-size: 0.9rem;
}

/* Card Variants */
.card--interactive {
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    cursor: pointer;
}

.card--interactive:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.card--center {
    text-align: center;
}

.card--highlight {
    background: linear-gradient(135deg, #f0f9ff, #e0f2fe);
    border-color: var(--primary-color);
    border-width: 2px;
}

.card--highlight h2 {
    color: var(--primary-color);
}

/* CTA Buttons Container */
.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--spacing-md);
}

/* Card Grid Layout */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

/* ==========================================
   BUTTONS
   ========================================== */

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
}

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    text-decoration: none;
}

.btn-primary:disabled {
    background-color: var(--secondary-color);
    cursor: not-allowed;
    opacity: 0.7;
}

.btn-secondary {
    color: var(--primary-color);
    background-color: transparent;
    border: 1px solid var(--primary-color);
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.1rem;
}

.btn-icon {
    font-size: 1.2rem;
}

/* Legacy button class for backwards compatibility */
.button {
    display: inline-block;
    background: var(--primary-color);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 9999px;
    font-weight: 600;
    margin-top: 1rem;
}

.button:hover {
    text-decoration: none;
    background: var(--primary-hover);
}

/* ==========================================
   FORMS
   ========================================== */

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

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    font-size: 0.95rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--background);
    color: var(--text-primary);
    font-family: inherit;
    transition: all 0.2s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.85rem;
    resize: vertical;
}

/* ==========================================
   STATUS MESSAGES
   ========================================== */

.status-message {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: 8px;
    font-weight: 500;
}

.status-message.success {
    background-color: #dcfce7;
    color: var(--success-color);
    border: 1px solid var(--success-color);
}

.status-message.error {
    background-color: #fee2e2;
    color: var(--error-color);
    border: 1px solid var(--error-color);
}

.status-message.info {
    background-color: #dbeafe;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

.status-message.warning {
    background-color: #fef3c7;
    color: var(--warning-color);
    border: 1px solid var(--warning-color);
}

/* ==========================================
   CODE BLOCKS
   ========================================== */

pre {
    background-color: var(--code-bg);
    color: var(--code-text);
    padding: var(--spacing-md);
    border-radius: 8px;
    overflow-x: auto;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.85rem;
    line-height: 1.5;
}

code {
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.9em;
    background-color: var(--background);
    padding: 0.2em 0.4em;
    border-radius: 4px;
}

pre code {
    background: none;
    padding: 0;
}

/* ==========================================
   UTILITY CLASSES
   ========================================== */

.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

/* Spacing utilities */
.mb-4 {
    margin-bottom: var(--spacing-lg) !important;
}

.mt-4 {
    margin-top: var(--spacing-lg) !important;
}

.p-4 {
    padding: var(--spacing-lg) !important;
}

/* ==========================================
   RESPONSIVE
   ========================================== */

@media (max-width: 600px) {
    :root {
        --spacing-xl: 1rem;
    }

    header h1 {
        font-size: 2rem;
    }

    header p {
        font-size: 1rem;
    }

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

    .container {
        padding: var(--spacing-md);
    }
}