/* ================================
   HEADER / NAVBAR
   ================================ */
.navbar {
    display: flex;
    justify-content: space-between;   /* logo left, nav + button right */
    align-items: center;
    background-color: var(--color-primary);
    padding: var(--spacing-md) var(--spacing-xl);
    color: #fff;
    margin-bottom: var(--spacing-md);
    flex-wrap: nowrap;
    gap: 0;
}

/* Navigation container */
nav {
    flex: 1;
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: var(--spacing-lg);
}

/* Navigation links */
.nav-links {
    list-style: none;
    display: flex;
    gap: var(--spacing-lg);
    margin: 0;
    padding: 0;
    align-items: center;
}
.nav-links li {
    display: flex;
    align-items: center;
}
.nav-links a {
    text-decoration: none;
    color: #fff;
    font-weight: 500;
    padding: var(--spacing-sm) 0;
    border-bottom: 2px solid transparent;
    transition: color var(--transition-speed), border-bottom var(--transition-speed);
}
.nav-links a:hover,
.nav-links a:focus {
    color: var(--color-light);
    border-bottom-color: #fff;
}

/* Logo */
.logo {
    font-size: 1.5em;
    font-weight: bold;
    color: #fff;
    flex: 0 1 auto;
    z-index: 101;
}
.logo .subtitle {
    font-size: 0.6em;
    font-weight: normal;
    display: block;
    margin-top: 2px;
    color: #e0e0e0;
}

/* Hamburger Menu */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: #fff;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
    z-index: 102;
    transition: all var(--transition-speed);
    margin-left: auto;
}
.menu-toggle:hover,
.menu-toggle:focus {
    transform: scale(1.1);
    outline: 2px solid #fff;
    outline-offset: 2px;
}
.menu-toggle span {
    display: block;
    width: 25px;
    height: 2px;
    background-color: #fff;
    margin: 5px 0;
    transition: all var(--transition-speed);
}
.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(10px, 10px);
}
.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}
.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* Navbar button */
.navbar .btn-primary {
    margin-left: var(--spacing-md);
    background-color: #fff;
    color: var(--color-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 4px;
    text-decoration: none;
    font-weight: bold;
    transition: color var(--transition-speed), background-color var(--transition-speed);
    flex: 0 1 auto;
    border: none;
    cursor: pointer;
}

.navbar .btn-primary:hover,
.navbar .btn-primary:focus {
    background-color: var(--color-light);
    transform: scale(1.05);
}

/* ================================
   RESPONSIVE DESIGN
   ================================ */

/* Tablet (768px and below) */
@media (max-width: 768px) {
    .navbar {
        flex-wrap: wrap;
        padding: var(--spacing-md) var(--spacing-lg);
        justify-content: space-between;
        gap: var(--spacing-md);
    }
    .menu-toggle { display: flex; }
    nav {
        width: 100%;
        order: 3;
        flex: 1 1 100%;
        justify-content: center;
        gap: var(--spacing-md);
        margin-top: var(--spacing-sm);
        max-height: 500px;
        overflow-y: auto;
        transition: all var(--transition-speed);
    }
    nav.hidden {
        display: none;
        max-height: 0;
    }
    .nav-links {
        gap: var(--spacing-md);
        justify-content: center;
        flex-direction: column;
        width: 100%;
    }
    .nav-links li { text-align: center; }
    .nav-links a {
        font-size: 0.9rem;
        display: block;
        padding: var(--spacing-sm);
    }
    .btn-primary {
        order: 2;
        flex: 0 1 auto;
    }
}

/* Mobile (576px and below) */
@media (max-width: 576px) {
    .navbar {
        padding: var(--spacing-sm) var(--spacing-md);
        gap: var(--spacing-sm);
    }
    .logo {
        font-size: 1.1em;
        order: 1;
    }
    .logo .subtitle { font-size: 0.5em; }
    .menu-toggle { display: flex; order: 2; }
    nav {
        width: calc(100% + var(--spacing-lg));
        margin: 0 -var(--spacing-md);
        padding: var(--spacing-md);
        order: 3;
        flex: 1 1 100%;
        background-color: var(--color-primary-dark);
        gap: var(--spacing-sm);
        margin-top: var(--spacing-sm);
        max-height: 500px;
        overflow-y: auto;
        transition: all var(--transition-speed);
    }
    nav.hidden {
        display: none;
        max-height: 0;
    }
    .nav-links {
        gap: var(--spacing-sm);
        flex-direction: column;
        width: 100%;
    }
    .nav-links li { text-align: center; }
    .nav-links a {
        font-size: 0.85rem;
        padding: var(--spacing-sm);
        border-bottom: 1px solid rgba(255,255,255,0.2);
        display: block;
    }
    .nav-links a:last-child { border-bottom: none; }
    .btn-primary {
        order: 3;
        padding: var(--spacing-xs) var(--spacing-md);
        font-size: 0.85rem;
        width: 100%;
        text-align: center;
        margin-top: var(--spacing-sm);
    }
}