/* 
   GIS Textbook Core Styles
   Designed by Antigravity for Dr. Sounny
   Premium, Minimalist, and Modern
*/

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@300;400;600;800&display=swap');

:root {
    /* Color Palette */
    --primary: #4A90A4;
    --primary-dark: #2D5A68;
    --secondary: #6B7280;
    --accent: #FF7F50;
    --bg-main: #F8FAFC;
    --bg-card: #FFFFFF;
    --text-main: #1E293B;
    --text-muted: #64748B;
    
    /* Callout Backgrounds */
    --callout-info-bg: #E0F2FE;
    --callout-info-border: #0EA5E9;
    --callout-success-bg: #F0FDF4;
    --callout-success-border: #22C55E;
    --callout-warning-bg: #FFFBEB;
    --callout-warning-border: #F59E0B;
    --callout-error-bg: #FEF2F2;
    --callout-error-border: #EF4444;

    /* Spacing & Borders */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    color: var(--text-main);
    background-color: var(--bg-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
    font-family: 'Outfit', sans-serif;
    font-weight: 600;
    color: var(--text-main);
    line-height: 1.2;
}

/* Layout */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem;
}

/* Header/Hero Section */
.hero {
    padding: 4rem 0;
    text-align: center;
    background: linear-gradient(135deg, #4a90a415 0%, #ffffff 100%);
    border-bottom: 1px solid rgba(0,0,0,0.05);
    margin-bottom: 3rem;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
    background: linear-gradient(to right, var(--primary-dark), var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
}

/* Cards & Content Blocks */
.card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(0,0,0,0.05);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

/* Callouts (Bootstrap-style but cleaner) */
.callout {
    padding: 1.5rem;
    margin: 2rem 0;
    border-radius: var(--radius-sm);
    border-left: 5px solid transparent;
}

.callout.info {
    background-color: var(--callout-info-bg);
    border-left-color: var(--callout-info-border);
}

.callout.success {
    background-color: var(--callout-success-bg);
    border-left-color: var(--callout-success-border);
}

.callout.warning {
    background-color: var(--callout-warning-bg);
    border-left-color: var(--callout-warning-border);
}

/* Progress/Navigation Grid */
.module-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.module-item {
    background: white;
    padding: 1.5rem;
    border-radius: var(--radius-md);
    border: 1px solid rgba(0,0,0,0.05);
    text-decoration: none;
    color: inherit;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.module-item:hover {
    background: var(--primary);
    color: white;
    transform: scale(1.02);
}

.module-number {
    display: block;
    font-size: 0.875rem;
    font-weight: 700;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
    color: var(--primary);
}

.module-item:hover .module-number {
    color: rgba(255,255,255,0.8);
}

.module-title {
    font-weight: 600;
    font-size: 1.1rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s ease;
    cursor: pointer;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
}

/* Footer */
footer {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-muted);
    font-size: 0.875rem;
    border-top: 1px solid rgba(0,0,0,0.05);
}