/* DANCHEON CSS - PACO Design System */

:root {
    /* Primary Colors */
    --primary-blue: #1e3a8a;
    --secondary-blue: #3b82f6;
    --accent-blue: #60a5fa;
    --light-blue: #dbeafe;
    
    /* Neutral Colors */
    --white: #ffffff;
    --light-gray: #f8fafc;
    --gray: #64748b;
    --dark-gray: #334155;
    --border-gray: #e2e8f0;
    
    /* Semantic Colors */
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', monospace;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

/* Reset and Base Styles */
* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--dark-gray);
    background: linear-gradient(135deg, #E8F4FF 0%, #D6EBFF 50%, #C4E2FF 100%);
    min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    margin: 0 0 var(--space-md) 0;
    font-weight: 600;
    line-height: 1.3;
    color: var(--primary-blue);
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.25rem;
}

h5 {
    font-size: 1.125rem;
}

p {
    margin: 0 0 var(--space-md) 0;
    line-height: 1.7;
}

/* Layout Components */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.content-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-gray);
}

/* Header */
.sticky-header {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-gray);
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-md);
}

.logo a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-blue);
    text-decoration: none;
    letter-spacing: 0.05em;
}

.main-nav ul {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: var(--space-lg);
}

.main-nav a {
    color: var(--gray);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

.main-nav a:hover {
    color: var(--primary-blue);
}

/* Grid System */
.grid {
    display: grid;
    gap: var(--space-md);
}

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

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

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

.col-span-2 {
    grid-column: span 2;
}

/* Feature Cards */
.feature-card {
    background: var(--white);
    border: 1px solid var(--border-gray);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    text-align: center;
    transition: all 0.2s ease;
}

.feature-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: var(--secondary-blue);
}

.feature-card .icon {
    font-size: 2rem;
    margin-bottom: var(--space-md);
}

.feature-card h4 {
    font-size: 1.125rem;
    margin-bottom: var(--space-sm);
    color: var(--primary-blue);
}

.feature-card p {
    font-size: 0.875rem;
    margin: 0;
    color: var(--gray);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: var(--space-md) var(--space-xl);
    border: none;
    border-radius: var(--radius-lg);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background: var(--primary-blue);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--white);
    color: var(--secondary-blue);
    border: 2px solid var(--secondary-blue);
}

.btn-secondary:hover {
    background: var(--secondary-blue);
    color: var(--white);
}

/* Forms */
.form-group {
    margin-bottom: var(--space-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--space-sm);
    font-weight: 500;
    color: var(--dark-gray);
}

.form-input {
    width: 100%;
    padding: var(--space-md);
    border: 1px solid var(--border-gray);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: border-color 0.2s ease;
}

.form-input:focus {
    outline: none;
    border-color: var(--secondary-blue);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Utilities */
.text-center {
    text-align: center;
}

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

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

.text-sm {
    font-size: 0.875rem;
}

.text-lg {
    font-size: 1.125rem;
}

.text-xl {
    font-size: 1.25rem;
}

.text-2xl {
    font-size: 1.5rem;
}

.font-bold {
    font-weight: 700;
}

.font-semibold {
    font-weight: 600;
}

.font-medium {
    font-weight: 500;
}

/* Spacing */
.my-4 {
    margin-top: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.my-8 {
    margin-top: var(--space-2xl);
    margin-bottom: var(--space-2xl);
}

.my-12 {
    margin-top: 3rem;
    margin-bottom: 3rem;
}

.my-16 {
    margin-top: 4rem;
    margin-bottom: 4rem;
}

.mb-4 {
    margin-bottom: var(--space-lg);
}

.mb-8 {
    margin-bottom: var(--space-2xl);
}

.mb-12 {
    margin-bottom: 3rem;
}

.mt-4 {
    margin-top: var(--space-lg);
}

.mt-8 {
    margin-top: var(--space-2xl);
}

.p-4 {
    padding: var(--space-lg);
}

.px-4 {
    padding-left: var(--space-lg);
    padding-right: var(--space-lg);
}

.py-4 {
    padding-top: var(--space-lg);
    padding-bottom: var(--space-lg);
}

/* Width Utilities */
.w-full {
    width: 100%;
}

.max-w-xl {
    max-width: 36rem;
}

.max-w-2xl {
    max-width: 42rem;
}

.max-w-4xl {
    max-width: 56rem;
}

.mx-auto {
    margin-left: auto;
    margin-right: auto;
}

/* Colors */
.text-blue {
    color: var(--secondary-blue);
}

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

.bg-blue {
    background-color: var(--secondary-blue);
}

.bg-light {
    background-color: var(--light-gray);
}

/* PACO Specific Styles */
.dancheon-accent-border {
    border-left: 4px solid var(--secondary-blue);
    padding-left: var(--space-lg);
}

.highlight-number {
    color: var(--secondary-blue);
    font-weight: 600;
}

.chart-container {
    position: relative;
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-sm);
}

/* Footer */
footer {
    background: var(--dark-gray);
    color: var(--white);
    text-align: center;
    padding: var(--space-2xl);
    margin-top: var(--space-2xl);
}

footer p {
    margin: 0;
    opacity: 0.8;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-sm);
    }
    
    .header-content {
        flex-direction: column;
        gap: var(--space-md);
        padding: var(--space-sm);
    }
    
    .main-nav ul {
        flex-direction: column;
        text-align: center;
        gap: var(--space-md);
    }
    
    .content-card {
        padding: var(--space-lg);
    }
    
    .grid-cols-2,
    .grid-cols-3,
    .grid-cols-4 {
        grid-template-columns: 1fr;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    .text-xl {
        font-size: 1.125rem;
    }
}

@media (max-width: 480px) {
    .content-card {
        padding: var(--space-md);
    }
    
    .feature-card {
        padding: var(--space-md);
    }
    
    h1 {
        font-size: 1.75rem;
    }
    
    h2 {
        font-size: 1.25rem;
    }
}

/* Animation Utilities */
.fade-in {
    animation: fadeIn 0.6s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.slide-up {
    animation: slideUp 0.6s ease-out;
}

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

/* Focus States for Accessibility */
.btn:focus,
.form-input:focus,
a:focus {
    outline: 2px solid var(--secondary-blue);
    outline-offset: 2px;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    :root {
        --border-gray: #666;
        --gray: #333;
    }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}