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

/* ===== Root Colors ===== */
:root {
    --primary: #1e293b;      /* Dark blue-gray */
    --accent: #2563eb;       /* Vibrant blue */
    --background: #f8fafc;   /* Soft light gray */
    --card-bg: #ffffff;       /* White cards */
    --text: #111827;          /* Dark text */
    --muted: #6b7280;         /* Gray for footer/secondary */
}

/* ===== Body ===== */
body {
    font-family: 'Inter', 'Poppins', sans-serif;
    background-color: var(--background);
    color: var(--text);
    line-height: 1.75;
    font-size: 16px;
}

/* ===== Container ===== */
.container {
    max-width: 950px;
    margin: 50px auto;
    padding: 0 20px;
}

/* ===== Header ===== */
header {
    text-align: center;
    margin-bottom: 50px;
}

header h1 {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
}

header .tagline {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--accent);
    letter-spacing: 0.5px;
}

/* ===== Navigation ===== */
.top-nav {
    text-align: center;
    margin-bottom: 50px;
}

.top-nav a {
    color: var(--accent);
    font-weight: 600;
    text-decoration: none;
    padding-bottom: 3px;
    border-bottom: 2px solid transparent;
    transition: all 0.3s ease;
}

.top-nav a:hover {
    border-bottom: 2px solid var(--accent);
}

/* ===== Section Cards ===== */
.section-card {
    background: var(--card-bg);
    padding: 35px 30px;
    border-radius: 15px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.05);
    margin-bottom: 35px;
    transition: all 0.3s ease;
}

.section-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.08);
}

/* ===== Section Titles ===== */
.section-card h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 18px;
    position: relative;
    display: inline-block;
}

.section-card h2::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--accent);
    margin-top: 6px;
    border-radius: 2px;
}

.section-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-top: 18px;
    margin-bottom: 12px;
    color: var(--primary);
}

/* ===== Lists ===== */
ul {
    margin-left: 20px;
    list-style: disc inside;
}

ul li {
    margin-bottom: 10px;
    line-height: 1.6;
}

/* ===== Links ===== */
a.email-link {
    color: var(--accent);
    font-weight: 500;
    text-decoration: none;
}

a.email-link:hover {
    text-decoration: underline;
}

/* ===== Footer ===== */
footer {
    text-align: center;
    color: var(--muted);
    font-size: 0.9rem;
    margin-top: 60px;
    padding-top: 25px;
    border-top: 1px solid #e5e7eb;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    header h1 {
        font-size: 2.2rem;
    }
    
    .section-card h2 {
        font-size: 1.6rem;
    }
    
    .section-card h3 {
        font-size: 1.1rem;
    }
    
    .section-card {
        padding: 25px 20px;
    }
}