/* NAVBAR */
.navbar {
    width: 100%; display: flex; justify-content: space-between; align-items: center;
    padding: 1.3rem 4rem;
    position: sticky; top: 0;
    backdrop-filter: blur(18px);
    background: var(--navbar-bg);
    border-bottom: 1px solid rgba(255,255,255,0.05);
    z-index: 1000;
}
.logo-section { display: flex; align-items: center; gap: 0.8rem; }
.logo-dot {
    width: 12px; height: 12px; border-radius: 50%;
    background: var(--accent); box-shadow: 0 0 15px var(--accent);
}
.logo-section h2 { font-size: 1rem; letter-spacing: 3px; font-weight: 700; color: var(--text-strong); }
.nav-bar ul { display: flex; gap: 0.7rem; list-style: none; }
.nav-bar a {
    text-decoration: none; color: var(--muted);
    padding: 0.6rem 1rem; border-radius: 12px;
    font-size: 0.85rem; font-weight: 500;
    transition: all 0.3s cubic-bezier(.4,0,.2,1);
}
.nav-bar a:hover { background: var(--accent); color: var(--text-strong); transform: scale(1.05); }
.nav-bar a.active { color: var(--accent); font-weight: 600; }
#theme-select {
    background: var(--select-bg); color: var(--select-color);
    border: 1px solid rgba(255,255,255,0.08); border-radius: 12px;
    padding: 0.5rem 0.8rem; font-family: inherit; cursor: pointer; outline: none;
    font-size: 0.8rem;
}

/* ── MOBILE HAMBURGER TOGGLE (pure CSS, no JS required) ── */
.nav-toggle { display: none; }
.nav-toggle-label {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 26px; height: 20px;
    cursor: pointer;
    z-index: 1001;
}
.nav-toggle-label span {
    display: block; width: 100%; height: 2px;
    background: var(--text-strong); border-radius: 2px;
    transition: transform 0.3s cubic-bezier(.4,0,.2,1), opacity 0.2s ease;
}

/* ── RESPONSIVE BREAKPOINTS ── */
@media (max-width: 1100px) {
    .navbar { padding: 1.1rem 1.5rem; }
}

@media (max-width: 900px) {
    .navbar { flex-wrap: wrap; padding: 1rem 1.25rem; row-gap: 0; }
    .logo-section { order: 1; }
    .nav-toggle-label { display: flex; order: 2; margin-left: auto; }
    #theme-select { order: 3; margin-left: 0.8rem; font-size: 0.75rem; padding: 0.45rem 0.6rem; }

    .nav-bar {
        order: 4;
        width: 100%;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.35s cubic-bezier(.4,0,.2,1);
    }
    .nav-bar ul {
        flex-direction: column; gap: 0.3rem;
        padding: 1rem 0 1.2rem;
    }
    .nav-bar a { display: block; padding: 0.9rem 1rem; font-size: 0.92rem; }
    .nav-bar a:hover { transform: none; }

    .nav-toggle:checked ~ .nav-bar { max-height: 600px; }
    .nav-toggle:checked ~ .nav-toggle-label span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
    .nav-toggle:checked ~ .nav-toggle-label span:nth-child(2) { opacity: 0; }
    .nav-toggle:checked ~ .nav-toggle-label span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}

@media (max-width: 420px) {
    .logo-section h2 { font-size: 0.85rem; letter-spacing: 2px; }
    #theme-select { font-size: 0.7rem; padding: 0.4rem 0.5rem; }
}