/* estrogen.wiki - navbar + theme toggle */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    min-height: var(--navbar-height, 74px);
    z-index: 1000;
    backdrop-filter: blur(16px) saturate(140%);
    -webkit-backdrop-filter: blur(16px) saturate(140%);
    background: var(--nav-bg);
    transition: background var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
    padding: 0.7rem 0;
    border-bottom: 1px solid var(--accent-line);
}

.navbar.scrolled {
    background: var(--nav-bg-scrolled);
    box-shadow: 0 10px 34px rgba(0, 0, 0, 0.32), 0 0 38px var(--glow);
    border-bottom-color: var(--accent-line-strong);
}

.nav-container {
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1.5rem;
    position: relative;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    text-decoration: none;
    color: var(--text);
    transition: transform var(--transition-fast);
}

.logo-icon {
    width: 44px;
    height: 44px;
    display: block;
    object-fit: contain;
    border-radius: 12px;
    transition: transform var(--transition-base), filter var(--transition-base);
    filter: drop-shadow(0 0 10px var(--glow));
}

.logo-text {
    font-family: var(--ui-font);
    font-weight: 800;
    font-size: 1.2rem;
    letter-spacing: -0.02em;
    line-height: 1;
}

.logo-text .accent {
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo:hover {
    transform: translateY(-2px);
}

.logo:hover .logo-icon {
    transform: rotate(-6deg) scale(1.06);
    filter: drop-shadow(0 0 16px var(--glow));
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    flex: 1;
}

.nav-links {
    display: flex;
    gap: 0.4rem;
    list-style: none;
    margin: 0;
    padding: 0;
    flex: 1;
    justify-content: center;
}

.nav-link {
    color: var(--text-soft);
    text-decoration: none;
    position: relative;
    transition: color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
    padding: 0.5rem 0.95rem;
    border-radius: 999px;
    font-family: var(--ui-font);
    font-weight: 700;
    font-size: 0.95rem;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text);
    background: linear-gradient(135deg, var(--accent-soft), rgba(255, 255, 255, 0.04));
    box-shadow: inset 0 0 0 1px var(--accent-line-strong);
    transform: translateY(-1px);
}

.nav-divider {
    align-self: center;
    color: var(--text-muted);
    user-select: none;
    opacity: 0.6;
}

.nav-buttons {
    display: flex;
    gap: 0.7rem;
    align-items: center;
    margin-left: auto;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.65rem 1.3rem;
    border-radius: 999px;
    text-decoration: none;
    font-family: var(--ui-font);
    font-weight: 800;
    font-size: 0.92rem;
    transition: transform var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), color var(--transition-fast);
    white-space: nowrap;
    border: 1px solid var(--accent-line);
    cursor: pointer;
}

.btn-secondary {
    color: var(--text);
    background: var(--surface-soft);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    border-color: var(--accent-line-strong);
    box-shadow: 0 10px 26px var(--glow);
}

.btn-primary {
    color: #fff;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    border-color: transparent;
    box-shadow: 0 12px 28px var(--glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 16px 38px var(--glow), 0 0 30px var(--glow);
    filter: brightness(1.06);
}

/* Theme toggle */
.theme-toggle {
    position: relative;
    width: 64px;
    height: 34px;
    padding: 0 7px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-radius: 999px;
    border: 1px solid var(--accent-line);
    background: var(--surface-strong);
    cursor: pointer;
    flex: 0 0 auto;
    transition: background var(--transition-base), border-color var(--transition-base), transform var(--transition-fast);
}

.theme-toggle:hover {
    transform: translateY(-1px);
    border-color: var(--accent-line-strong);
}

.theme-toggle .toggle-icon {
    font-size: 12px;
    opacity: 0.4;
    line-height: 1;
}

[data-theme="light"] .toggle-icon.sun,
[data-theme="dark"] .toggle-icon.moon {
    opacity: 1;
}

.theme-toggle .toggle-knob {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    box-shadow: 0 0 16px var(--glow);
    transition: transform 0.34s cubic-bezier(0.22, 1, 0.36, 1);
}

[data-theme="light"] .theme-toggle .toggle-knob {
    transform: translateX(30px);
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
    padding: 0.5rem;
    background: transparent;
    border: none;
    color: inherit;
    border-radius: 10px;
}

.mobile-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: var(--transition-base);
}

.mobile-toggle.active span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.mobile-toggle.active span:nth-child(2) { opacity: 0; }
.mobile-toggle.active span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.nav-overlay { display: none; }
body.nav-open { overflow: hidden; }

@media (max-width: 880px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: 0;
        height: 100vh;
        width: min(84vw, 330px);
        flex-direction: column;
        align-items: flex-start;
        gap: 1.4rem;
        background: var(--surface-strong);
        padding: calc(var(--navbar-height) + 1.4rem) 1.5rem 2rem;
        border-left: 1px solid var(--accent-line);
        box-shadow: -20px 0 60px rgba(0, 0, 0, 0.45);
        backdrop-filter: blur(18px);
        transform: translateX(110%);
        opacity: 0;
        pointer-events: none;
        transition: transform 0.5s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.4s ease;
        z-index: 1050;
        overflow-y: auto;
    }

    .nav-menu.active {
        transform: translateX(0);
        opacity: 1;
        pointer-events: auto;
    }

    .nav-links {
        flex-direction: column;
        gap: 0.6rem;
        width: 100%;
        align-items: flex-start;
    }

    .nav-divider { display: none; }

    .nav-buttons {
        flex-direction: column;
        width: 100%;
        margin-left: 0;
        align-items: stretch;
    }

    .nav-buttons .btn { width: 100%; }

    .theme-toggle { align-self: flex-start; }

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

    .nav-overlay {
        display: block;
        position: fixed;
        inset: 0;
        background: rgba(8, 5, 12, 0.6);
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.4s ease;
        z-index: 1040;
        backdrop-filter: blur(3px);
    }

    .nav-overlay.active {
        opacity: 1;
        pointer-events: auto;
    }
}