:root {
    --primary-color: #0f172a;
    --accent-color: #2563eb;
    --text-main: #334155;
    --text-muted: #64748b;
    --bg-light: #f8fafc;
    --white: #ffffff;
    --border-color: #e2e8f0;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    color: var(--text-main);
    background-color: var(--white);
    line-height: 1.6;
}

/* Header & Nav */
header {
    background: var(--white);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 1.5rem;
}

.logo {
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--primary-color);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.logo span {
    color: var(--accent-color);
}

nav ul {
    display: flex;
    list-style: none;
    gap: 1.5rem;
}

nav a {
    text-decoration: none;
    color: var(--text-main);
    font-weight: 600;
    transition: color 0.2s;
}

nav a:hover, nav a.active {
    color: var(--accent-color);
}

/* Common Layout */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 4rem 1.5rem;
}

.page-header {
    background: linear-gradient(180deg, var(--bg-light) 0%, var(--white) 100%);
    padding: 5rem 1.5rem 4rem;
    text-align: center;
}

.page-header h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    letter-spacing: -0.5px;
}

.page-header p {
    color: var(--text-muted);
    font-size: 1.15rem;
    max-width: 700px;
    margin: 0 auto;
}

.btn {
    display: inline-block;
    background-color: var(--accent-color);
    color: var(--white);
    padding: 0.8rem 1.8rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    transition: background 0.2s;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn:hover {
    background-color: #1d4ed8;
}

/* Grids & Cards */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.card {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2.5rem 2rem;
    background: var(--white);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.35rem;
}

/* Forms */
.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--primary-color);
    font-size: 0.95rem;
}

.form-group input, .form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
}

.form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
}

/* Footer */
footer {
    background: var(--primary-color);
    color: #94a3b8;
    padding: 4rem 1.5rem 2rem;
    margin-top: 5rem;
}

.footer-container {
    max-width: 1100px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    border-bottom: 1px solid #334155;
    padding-bottom: 2rem;
}

.footer-col h4 {
    color: var(--white);
    margin-bottom: 1.2rem;
    font-size: 1.1rem;
}

.footer-col p {
    margin-bottom: 0.6rem;
    font-size: 0.95rem;
}

.footer-col a {
    color: #60a5fa;
    text-decoration: none;
}

.footer-bottom {
    max-width: 1100px;
    margin: 1.5rem auto 0;
    text-align: center;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }
}