/* ===============================
   Header & Navigation
================================ */

.header {
    background: linear-gradient(135deg, #fff 0%, #f8fafc 100%);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow);
    animation: slideInDown 0.5s ease;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

/* ===============================
   Logo
================================ */

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--secondary-color);
    transition: var(--transition);
}

.logo:hover {
    transform: scale(1.05);
}

.logo-svg {
    color: var(--primary-color);
    animation: float 3s ease infinite;
}

/* ===============================
   Navigation
================================ */

.nav {
    display: flex;
    align-items: center;
}

/* Desktop Menu */
.nav-menu {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-menu a {
    color: var(--text-dark);
    font-weight: 500;
    position: relative;
    padding-bottom: 0.25rem;
    transition: var(--transition-smooth);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(
        90deg,
        var(--primary-color),
        var(--accent-color)
    );
    transition: width 0.3s ease;
}

.nav-menu a:hover {
    color: var(--primary-color);
}

.nav-menu a:hover::after {
    width: 100%;
}

/* ===============================
   Hamburger Button
================================ */

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 0.4rem;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    border-radius: 2px;
    transition: var(--transition);
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* ===============================
   Mobile Navigation (FULL FIX)
================================ */

@media (max-width: 768px) {

    .menu-toggle {
        display: flex;
        z-index: 1100;
    }

    .nav-menu {
        position: fixed;
        top: 70px; /* header height */
        left: 0;
        width: 100%;

        flex-direction: column;
        align-items: center;
        text-align: center;

        background: linear-gradient(135deg, #fff 0%, #f8fafc 100%);
        padding: 1.5rem;
        gap: 1.2rem;

        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow);
        z-index: 1000;

        /* Hidden state */
        max-height: 0;
        opacity: 0;
        visibility: hidden;
        overflow: hidden;

        transition:
            max-height 0.4s ease,
            opacity 0.3s ease;
    }

    .nav-menu.active {
        max-height: 500px;
        opacity: 1;
        visibility: visible;
    }

    .nav-menu a {
        width: 100%;
        padding: 0.75rem 0;
        text-align: center;
    }

    .logo {
        font-size: 1.25rem;
    }
}

/* ===============================
   Small Devices
================================ */

@media (max-width: 480px) {

    .logo {
        font-size: 1rem;
    }

    .nav-menu {
        padding: 1rem;
    }

    .nav-menu a {
        font-size: 0.9rem;
    }
}