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

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f8f9fa;
}

/* ==================== NAVBAR ==================== */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
    padding: 1rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
}

.logo {
    font-size: 1.6rem;
    font-weight: 700;
    color: #1e3a8a;
}

.navbar ul {
    list-style: none;
    display: flex;
    gap: 2rem;
}

.navbar a {
    text-decoration: none;
    color: #334155;
    font-weight: 500;
    transition: color 0.3s;
}

.navbar a:hover {
    color: #1e40af;
}

.navbar a.active {
    color: #1e40af;
    font-weight: 600;
    position: relative;
}

.navbar a.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 3px;
    background: #60a5fa;
}

/* ==================== HERO SECTION ==================== */
.hero {
    height: 100vh;
    background-image: 
        linear-gradient(rgba(0, 0, 0, 0.45), rgba(0, 0, 0, 0.45)),
        url('view.png');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
    position: relative;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 850px;
    padding: 0 20px;
}

/* ==================== ABOUT & GENERAL SECTIONS ==================== */
.about-section, .section {
    padding: 100px 8%;
    min-height: 70vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

.section h2 {
    font-size: 2.6rem;
    text-align: center;
    margin-bottom: 3rem;
    color: #1e3a8a;
    position: relative;
}

.section h2::after {
    content: '';
    width: 90px;
    height: 4px;
    background: #60a5fa;
    position: absolute;
    bottom: -14px;
    left: 50%;
    transform: translateX(-50%);
}

/* ==================== PROFILE CARDS ==================== */
.researcher-profile,
.supervisor-profile {
    display: flex;
    align-items: center;
    gap: 40px;
    background: white;
    padding: 35px;
    border-radius: 15px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
    margin-bottom: 40px;
}

.profile-photo {
    width: 230px;
    height: 230px;
    object-fit: cover;
    border-radius: 50%;
    border: 6px solid #1e40af;
    flex-shrink: 0;
}

.profile-info h2 {
    margin-top: 0;
    color: #1e3a8a;
    font-size: 2rem;
}

.profile-info p {
    margin-bottom: 8px;
    font-size: 1.05rem;
}

/* ==================== STEP CARDS (How to Use) ==================== */
.how-to-use {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 25px;
    margin-top: 30px;
}

.step-card {
    background: white;
    padding: 28px 24px;
    border-radius: 16px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
    border-left: 6px solid #1e40af;
    transition: all 0.3s ease;
    position: relative;
}

.step-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 30px rgba(30, 64, 175, 0.15);
    border-left-color: #60a5fa;
}

.step-card h3 {
    color: #1e40af;
    font-size: 1.35rem;
    margin-bottom: 12px;
    padding-left: 8px;
}

.step-card p {
    color: #334155;
    line-height: 1.7;
    font-size: 1.02rem;
}

/* Step Number */
.step-card::before {
    content: attr(data-step);
    position: absolute;
    top: -12px;
    left: -12px;
    background: #1e40af;
    color: white;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.1rem;
    box-shadow: 0 4px 10px rgba(30, 64, 175, 0.3);
}

/* ==================== BUTTONS ==================== */
.btn {
    background: #1e40af;
    color: white;
    padding: 14px 36px;
    font-size: 1.1rem;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s;
    font-weight: 600;
    text-decoration: none;
    display: inline-block;
}

.btn:hover {
    background: #3b82f6;
    transform: translateY(-4px);
    box-shadow: 0 10px 25px rgba(30, 64, 175, 0.4);
}

/* ==================== FORM STYLES (for Contact page) ==================== */
form {
    max-width: 700px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

input, textarea {
    padding: 15px;
    border: 1px solid #cbd5e1;
    border-radius: 10px;
    font-size: 1.05rem;
    transition: all 0.3s;
}

input:focus, textarea:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.15);
}

/* Footer */
footer {
    background: #1e3a8a;
    color: white;
    text-align: center;
    padding: 2.5rem 1rem;
    margin-top: 3rem;
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
    .navbar ul {
        gap: 1rem;
        font-size: 0.95rem;
    }
    
    .section, .about-section {
        padding: 80px 5%;
    }
    
    .hero h1 {
        font-size: 2.8rem;
    }
    
    .researcher-profile,
    .supervisor-profile {
        flex-direction: column;
        text-align: center;
        gap: 20px;
    }
    
    .profile-photo {
        width: 180px;
        height: 180px;
    }
}