/* OSSCI Website Styles - CSS3 Pure */
:root {
    --primary-gradient: linear-gradient(135deg, #ff8c00 0%, #ff4500 100%);
    --secondary-color: #2c3e50;
    --text-color: #333;
    --light-bg: #f9f9f9;
    --white: #ffffff;
    --shadow: 0 4px 6px rgba(0,0,0,0.1);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white);
}

/* Navigation */
header {
    background: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 5%;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: #ff4500;
    text-decoration: none;
}

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

.nav-links li {
    margin-left: 20px;
}

.nav-links a {
    text-decoration: none;
    color: var(--secondary-color);
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: #ff4500;
}

.nav-links a.active {
    color: #ff4500;
    border-bottom: 2px solid #ff4500;
}

/* Typography */
h1, h2, h3 {
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

p {
    margin-bottom: 1rem;
}

/* List Styles */
ul {
    margin-bottom: 1rem;
    padding-left: 20px;
}

li {
    margin-bottom: 0.5rem;
}

/* Hero Section */
.hero {
    height: 80vh;
    background: linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.5)), url('../assets/images/hero_education.jpg');
    background-size: cover;
    background-position: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: var(--white);
    padding: 0 20px;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    max-width: 800px;
    margin-bottom: 2rem;
}

/* Buttons */
.cta-btn {
    display: inline-block;
    padding: 12px 30px;
    background: var(--primary-gradient);
    color: var(--white);
    text-decoration: none;
    border-radius: 50px;
    font-weight: bold;
    transition: transform 0.3s, box-shadow 0.3s;
}

.cta-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 12px rgba(255, 69, 0, 0.3);
}

/* Sections */
section {
    padding: 80px 5%;
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title h2 {
    font-size: 2.5rem;
    color: var(--secondary-color);
    margin-bottom: 10px;
}

.section-title .underline {
    width: 80px;
    height: 4px;
    background: var(--primary-gradient);
    margin: 0 auto;
}

/* Grid Layouts */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.card {
    background: var(--white);
    padding: 30px;
    border-radius: 10px;
    box-shadow: var(--shadow);
    transition: transform 0.3s;
}

.card:hover {
    transform: translateY(-10px);
}

/* Footer */
footer {
    background: var(--secondary-color);
    color: var(--white);
    padding: 50px 5% 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    max-width: 1200px;
    margin: 0 auto;
}

.footer-bottom {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 { font-size: 2.5rem; }
    .nav-links { 
        display: none; /* In a real project, we'd add a hamburger menu here */
    }
    .grid-3 {
        grid-template-columns: 1fr;
    }
    section {
        padding: 40px 5%;
    }
    .hero {
        height: 60vh;
    }
}

/* Utility Classes */
.text-center { text-align: center; }
.mt-20 { margin-top: 20px; }
.mb-20 { margin-bottom: 20px; }
.bg-light { background-color: var(--light-bg); }
.gradient-text {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: bold;
}