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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    color: var(--color-text);
    background-color: var(--color-background);
    line-height: 1.6;
    overflow-x: hidden;
}

/* VARIABLES */
:root {
    --color-primary: #0056b3;
    --color-primary-dark: #003d82;
    --color-text: #1a1a1a;
    --color-muted: #666666;
    --color-background: #ffffff;
    --color-surface: #f8f9fa;
    --color-border: #e5e5e5;
    
    --container-width: 1280px;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.05);
    --shadow-hover: 0 10px 15px rgba(0,0,0,0.1);
    
    --transition: all 0.3s ease;
}

/* TYPOGRAPHY */
h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 1rem;
}
h1 { font-size: 3rem; letter-spacing: -0.02em; }
h2 { font-size: 2.25rem; letter-spacing: -0.01em; }
h3 { font-size: 1.5rem; }

p {
    margin-bottom: 1rem;
    color: var(--color-muted);
}
a {
    color: var(--color-primary);
    text-decoration: none;
    transition: var(--transition);
}
a:hover {
    color: var(--color-primary-dark);
}

/* LAYOUT */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 2rem;
}
section {
    padding: 5rem 0;
}
.section-light {
    background-color: var(--color-background);
}
.section-gray {
    background-color: var(--color-surface);
}

.text-center { text-align: center; }
.mt-4 { margin-top: 1.5rem; }
.ml-2 { margin-left: 0.5rem; }

.grid {
    display: grid;
    gap: 2rem;
}
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* HEADER */
.site-header {
    background-color: rgba(255, 255, 255, 0.95);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(8px);
}
.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}
.logo strong {
    font-size: 1.25rem;
    color: var(--color-primary);
    letter-spacing: -0.02em;
}
.main-nav ul {
    display: flex;
    list-style: none;
    gap: 1.5rem;
    align-items: center;
}
.main-nav a {
    color: var(--color-text);
    font-weight: 500;
    font-size: 0.95rem;
}
.main-nav a:hover {
    color: var(--color-primary);
}
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text);
}

/* BUTTONS */
.btn {
    display: inline-flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
    font-weight: 500;
    cursor: pointer;
    border: 1px solid transparent;
    transition: var(--transition);
}
.btn-primary {
    background-color: var(--color-primary);
    color: #fff !important;
}
.btn-primary:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-1px);
}
.btn-outline {
    background-color: transparent;
    border-color: var(--color-primary);
    color: var(--color-primary) !important;
}
.btn-outline:hover {
    background-color: var(--color-primary);
    color: #fff !important;
}

/* CARDS */
.card {
    background: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 2rem;
    transition: var(--transition);
    display: block;
    position: relative;
}
.card:hover {
    transform: translateY(-4px);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-hover);
}
.card-icon {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 1rem;
}
.card h3 {
    margin-bottom: 0.5rem;
    font-size: 1.25rem;
}
.card-arrow {
    position: absolute;
    bottom: 2rem;
    right: 2rem;
    opacity: 0;
    transition: var(--transition);
    color: var(--color-primary);
}
.card:hover .card-arrow {
    opacity: 1;
    transform: translateX(5px);
}

/* HERO SECTION */
.hero {
    padding: 8rem 0;
}
.hero h1 {
    max-width: 800px;
}
.hero-subtitle {
    font-size: 1.25rem;
    max-width: 600px;
    margin-bottom: 2rem;
}
.hero-actions {
    display: flex;
    gap: 1rem;
}

/* PROJECTS OVERVIEW */
.project-card {
    background: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    overflow: hidden;
}
.project-image {
    height: 250px;
    background-color: var(--color-border);
    /* placeholder gradient */
    background: linear-gradient(135deg, #f0f0f0 0%, #e0e0e0 100%);
}
.project-image.mapbook-highlight {
    background: linear-gradient(135deg, #e6f0fa 0%, #ccddf0 100%);
}
.project-info {
    padding: 2rem;
}
.project-category {
    font-size: 0.85rem;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
    margin-bottom: 0.5rem;
    display: block;
}
.link-arrow {
    display: inline-block;
    margin-top: 1rem;
    font-weight: 500;
}

/* PROCESS GRID */
.process-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}
.process-step {
    position: relative;
}
.step-num {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-border);
    display: block;
    margin-bottom: 1rem;
}

/* FEATURE ITEM */
.feature-item h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

/* PAGE HEADER */
.page-header {
    background-color: var(--color-surface);
    padding: 4rem 0 2rem;
    border-bottom: 1px solid var(--color-border);
}

/* FORMS */
.form-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    max-width: 800px;
    margin: 0 auto;
    background: var(--color-background);
    padding: 2.5rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
}
.form-group {
    display: flex;
    flex-direction: column;
}
.form-group.full-width {
    grid-column: 1 / -1;
}
label {
    font-weight: 500;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}
input, select, textarea {
    padding: 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: inherit;
    transition: var(--transition);
}
input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0,86,179,0.1);
}

/* FOOTER */
.site-footer {
    border-top: 1px solid var(--color-border);
    padding-top: 4rem;
}
.footer-inner {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
    gap: 2rem;
    margin-bottom: 3rem;
}
.footer-col h3, .footer-col h4 {
    margin-bottom: 1.25rem;
}
.footer-col h4 {
    font-size: 1rem;
}
.footer-col ul {
    list-style: none;
}
.footer-col li {
    margin-bottom: 0.5rem;
}
.footer-col a {
    color: var(--color-muted);
    font-size: 0.95rem;
}
.footer-col a:hover {
    color: var(--color-primary);
}
.footer-bottom {
    border-top: 1px solid var(--color-border);
    padding: 1.5rem 0;
    text-align: center;
    font-size: 0.85rem;
    color: var(--color-muted);
}