/* ===========================
   Base Styles & Reset
   =========================== */

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

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fafafa;
}

/* ===========================
   Typography
   =========================== */

h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    margin-top: 1.5em;
    margin-bottom: 0.5em;
    font-weight: 600;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.1rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: 1em;
}

a {
    color: #0066cc;
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s ease;
}

a:hover,
a:focus {
    border-bottom-color: #0066cc;
    outline: 2px solid #0066cc;
    outline-offset: 2px;
}

/* ===========================
   Layout
   =========================== */

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* ===========================
   Header
   =========================== */

header {
    background-color: #2c3e50;
    color: #fff;
    padding: 2rem 1rem;
    border-bottom: 4px solid #0066cc;
}

header h1 {
    margin: 0;
    font-size: 2rem;
}

.tagline {
    margin: 0.5rem 0 0 0;
    font-size: 1rem;
    opacity: 0.9;
}

/* ===========================
   Navigation
   =========================== */

nav {
    background-color: #34495e;
    padding: 0;
}

.nav-list {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
}

.nav-list li {
    margin: 0;
}

.nav-list a {
    display: block;
    padding: 1rem;
    color: #ecf0f1;
    border: none;
}

.nav-list a:hover,
.nav-list a:focus {
    background-color: #0066cc;
    border: none;
    color: #fff;
}

.nav-list a.active {
    background-color: #0066cc;
    color: #fff;
    font-weight: 600;
}

/* ===========================
   Main Content
   =========================== */

main {
    min-height: calc(100vh - 300px);
    padding: 2rem 1rem;
}

section {
    margin-bottom: 3rem;
}

section h2 {
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #0066cc;
}

/* ===========================
   Hero Section
   =========================== */

.hero {
    background-color: #ecf0f1;
    padding: 2rem;
    border-radius: 4px;
    margin-bottom: 2rem;
}

.hero h2 {
    border: none;
    margin-top: 0;
}

/* ===========================
   Grid Layouts
   =========================== */

.grid-2 {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin: 1rem 0;
}

.grid-2 > * {
    flex: 1 1 calc(50% - 0.75rem);
    min-width: 250px;
}

.grid-3 {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin: 1rem 0;
}

.grid-3 > * {
    flex: 1 1 calc(33% - 1rem);
    min-width: 200px;
}

/* ===========================
   Cards
   =========================== */

.card {
    background-color: #fff;
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 1.5rem;
    transition: box-shadow 0.2s ease;
}

.card:hover {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.card h3 {
    margin-top: 0;
}

.card p {
    margin-bottom: 1rem;
}

/* ===========================
   Lists
   =========================== */

ul, ol {
    margin: 1rem 0 1rem 1.5rem;
}

ul li, ol li {
    margin-bottom: 0.5rem;
}

/* ===========================
   Buttons
   =========================== */

.button {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: #0066cc;
    color: #fff;
    border: 2px solid #0066cc;
    border-radius: 4px;
    text-decoration: none;
    transition: all 0.2s ease;
    cursor: pointer;
    font-weight: 600;
}

.button:hover,
.button:focus {
    background-color: #0052a3;
    border-color: #0052a3;
    outline: 2px solid #0066cc;
    outline-offset: 2px;
}

.button.secondary {
    background-color: transparent;
    color: #0066cc;
    border-color: #0066cc;
}

.button.secondary:hover,
.button.secondary:focus {
    background-color: #0066cc;
    color: #fff;
}

/* ===========================
   Footer
   =========================== */

footer {
    background-color: #2c3e50;
    color: #ecf0f1;
    padding: 2rem 1rem;
    margin-top: 3rem;
    text-align: center;
    border-top: 4px solid #0066cc;
}

footer p {
    margin: 0.5rem 0;
}

footer a {
    color: #0099ff;
}

/* ===========================
   Forms
   =========================== */

input, textarea, select {
    font-family: inherit;
    font-size: 1rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    padding: 0.75rem;
    margin-bottom: 1rem;
    width: 100%;
    max-width: 400px;
}

input:focus, textarea:focus, select:focus {
    outline: 2px solid #0066cc;
    outline-offset: 2px;
    border-color: #0066cc;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.form-group {
    margin-bottom: 1.5rem;
}

.contact-form {
    max-width: 600px;
}

/* ===========================
   Accessibility
   =========================== */

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: #0066cc;
    color: #fff;
    padding: 8px;
    text-decoration: none;
    z-index: 100;
}

.skip-link:focus {
    top: 0;
}

/* ===========================
   Responsive Design
   =========================== */

@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
    
    header h1 {
        font-size: 1.75rem;
    }
    
    .nav-list {
        flex-wrap: nowrap;
        overflow-x: auto;
    }
    
    .grid-2 > * {
        flex: 1 1 100%;
    }
    
    .grid-3 > * {
        flex: 1 1 100%;
    }
    
    input, textarea, select {
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }
    
    .nav-list a {
        padding: 0.75rem 1rem;
    }
    
    .card {
        padding: 1rem;
    }
    
    .button {
        width: 100%;
        text-align: center;
    }
}

/* ===========================
   Print Styles
   =========================== */

@media print {
    body {
        background-color: #fff;
    }
    
    header, nav, footer {
        display: none;
    }
    
    a {
        text-decoration: underline;
    }
}