:root {
    --primary: #2468d7;
    --primary-dark: #0b3c91;
    --yellow: #ffda55;
    --text: #102040;
    --muted: #64748b;
    --white: #ffffff;
    --glass: rgba(255, 255, 255, 0.68);
    --border: rgba(255, 255, 255, 0.75);
}

.site-header {
    position: fixed;
    inset: 0 0 auto 0;
    z-index: 1000;
    padding: 18px 0;
    transition: .3s ease;
}

.site-header.scrolled {
    padding: 10px 0;
    background: transparent;
    box-shadow: none;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
}

.site-header.scrolled .navbar {
    background: rgba(255, 255, 255, 0.88);
    box-shadow: 0 14px 35px rgba(31, 79, 150, 0.12);
    border-color: rgba(255, 255, 255, 0.95);
}

.container {
    width: min(1160px, calc(100% - 40px));
    margin: 0 auto;
}

@media (max-width: 480px) {
    .container {
        width: min(1160px, calc(100% - 24px));
    }
}

.navbar {
    position: relative;
    min-height: 72px;
    padding: 8px 10px 8px 22px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(255,255,255,.70);
    border: 1px solid var(--border);
    border-radius: 22px;
    box-shadow: 0 18px 45px rgba(31, 79, 150, .10);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
}

.brand {
    width: 160px;
    display: flex;
    align-items: center;
}

.brand img {
    display: block;
    width: 100%;
    height: auto;
    object-fit: contain;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    position: relative;
    padding: 12px 15px;
    color: #40516e;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    border-radius: 12px;
    transition: .25s ease;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary);
    background: rgba(36, 104, 215, .07);
}

.nav-register {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-left: 8px;
    padding: 13px 19px;
    color: #fff;
    font-size: 14px;
    font-weight: 700;
    text-decoration: none;
    border-radius: 13px;
    background: linear-gradient(135deg, #2e75df, #174aa8);
    box-shadow: 0 10px 25px rgba(36,104,215,.25);
    transition: .25s ease;
}

.nav-register:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 30px rgba(36,104,215,.32);
}

.menu-toggle {
    display: none;
    width: 44px;
    height: 44px;
    border: 0;
    border-radius: 12px;
    background: rgba(36,104,215,.08);
    cursor: pointer;
    transition: background .25s ease;
}

.menu-toggle:active {
    background: rgba(36,104,215,.15);
}

.menu-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    margin: 4px auto;
    background: var(--primary);
    border-radius: 10px;
    transition: transform .25s ease, opacity .2s ease;
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}

.menu-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

@media (max-width: 850px) {
    .navbar {
        padding-right: 14px;
    }

    .menu-toggle {
        display: block;
        position: relative;
        z-index: 1002;
    }

    .nav-menu {
        position: absolute;
        top: calc(100% + 10px);
        left: 0;
        right: 0;
        z-index: 1001;
        display: flex;
        flex-direction: column;
        align-items: stretch;
        gap: 4px;
        padding: 14px;
        opacity: 0;
        visibility: hidden;
        transform: translateY(-8px);
        background: rgba(255,255,255,.94);
        border: 1px solid rgba(255,255,255,.8);
        border-radius: 20px;
        box-shadow: 0 20px 45px rgba(20, 58, 120, .14);
        backdrop-filter: blur(20px);
        transition: .25s ease;
    }

    .nav-menu.open {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .nav-link,
    .nav-register {
        width: 100%;
        justify-content: center;
        margin: 0;
        text-align: center;
    }

    .brand {
        width: 145px;
    }
}