/* ==========================================
   VARIABLES & GLOBAL RESETS
   ========================================== */
:root {
    --bg-base: #f8fafc;
    --bg-surface: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --primary: #6366f1;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    scroll-behavior: smooth;
}

/* ==========================================
   HEADER & NAVIGATION STYLES
   ========================================== */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 70px;
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 10%;
}

.logo {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
    letter-spacing: -0.5px;
    z-index: 1001;
}

/* Hamburger Menu Icon */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
    z-index: 1001;
    background: none;
    border: none;
    padding: 5px;
}

.hamburger span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--primary);
    transition: all 0.3s ease;
}

nav {
    display: flex;
    gap: 10px;
}

nav a {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.95rem;
    transition: color 0.2s;
    position: relative;
    padding: 5px 0;
}

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

/* Responsive Top Bar Adjustments */
@media (max-width: 992px) {
    header { padding: 0 5%; }
}

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    /* Mobile Nav Styles */
    nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background-color: white;
        flex-direction: column;
        align-items: flex-start;
        justify-content: flex-start;
        padding: 80px 30px;
        transition: right 0.3s ease;
        box-shadow: -5px 0 15px rgba(0,0,0,0.1);
        z-index: 1000;
        overflow-y: auto;
    }

    nav.active {
        right: 0;
    }

    /* Hamburger Animation */
    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 6px);
    }
    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }
    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -6px);
    }
}