/* ========================================
   Teacher's Pet — Global Nav
   Responsive glass-morphism pill nav
   Raas Leela palette: deep indigo + gold
   ======================================== */

/* Skip-to-content link */
.skip-to-content {
    position: fixed;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--krishna-indigo);
    color: white;
    padding: 12px 24px;
    border-radius: var(--radius-md);
    z-index: 10000;
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    transition: top 0.2s;
}

.skip-to-content:focus {
    top: 12px;
    outline: 2px solid var(--divine-gold);
    outline-offset: 2px;
}

/* Nav Container */
.nav {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, rgba(30, 27, 75, 0.95), rgba(76, 29, 149, 0.92));
    backdrop-filter: blur(32px) saturate(1.6);
    -webkit-backdrop-filter: blur(32px) saturate(1.6);
    border-radius: 9999px;
    border: 1px solid rgba(212, 175, 55, 0.2);
    padding: 8px 28px;
    z-index: 1000;
    display: flex;
    align-items: center;
    gap: 24px;
    box-shadow:
        0 8px 32px rgba(0, 0, 0, 0.35),
        0 0 0 1px rgba(124, 58, 237, 0.15),
        0 0 40px rgba(76, 29, 149, 0.08),
        inset 0 1px 0 rgba(255, 255, 255, 0.1),
        inset 0 -1px 0 rgba(212, 175, 55, 0.08);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    max-width: calc(100vw - 32px);
}

/* Scrolled state — warm cream mode */
.nav.scrolled {
    background: rgba(253, 248, 243, 0.97);
    border-color: rgba(76, 29, 149, 0.15);
    box-shadow:
        0 4px 20px rgba(76, 29, 149, 0.1),
        0 1px 3px rgba(0, 0, 0, 0.06),
        0 0 0 1px rgba(212, 175, 55, 0.06);
}

.nav.scrolled .nav-logo { color: var(--warm-charcoal); }
.nav.scrolled .nav-logo-icon { box-shadow: 0 2px 10px rgba(212, 175, 55, 0.3); }
.nav.scrolled .nav-link { color: var(--warm-muted); }
.nav.scrolled .nav-link:hover { color: var(--krishna-indigo); background: rgba(76, 29, 149, 0.07); }
.nav.scrolled .nav-link[aria-current="page"] {
    color: var(--krishna-indigo);
    background: linear-gradient(135deg, rgba(76, 29, 149, 0.1), rgba(212, 175, 55, 0.06));
    box-shadow: 0 1px 4px rgba(76, 29, 149, 0.1);
}
.nav.scrolled .nav-hamburger span { background: var(--warm-charcoal); }

/* Brand Logo */
.nav-logo {
    font-weight: 700;
    font-size: 0.95rem;
    color: white;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: color 0.3s;
    white-space: nowrap;
    flex-shrink: 0;
}

.nav-logo-icon {
    width: 30px;
    height: 30px;
    background: linear-gradient(135deg, var(--divine-gold), var(--coral-vermillion));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    box-shadow: 0 4px 12px rgba(212, 175, 55, 0.35);
    flex-shrink: 0;
}

/* Nav Links */
.nav-links {
    display: flex;
    gap: 2px;
}

.nav-link {
    color: rgba(255, 255, 255, 0.75);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    padding: 7px 14px;
    border-radius: 9999px;
    transition: all 0.25s ease;
    white-space: nowrap;
    letter-spacing: -0.01em;
}

.nav-link:hover {
    color: white;
    background: rgba(212, 175, 55, 0.12);
}

.nav-link[aria-current="page"] {
    color: white;
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.4), rgba(212, 175, 55, 0.18));
    font-weight: 600;
    box-shadow: 0 1px 8px rgba(124, 58, 237, 0.2), 0 0 0 1px rgba(212, 175, 55, 0.1);
}

/* Hamburger Toggle */
.nav-hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    background: none;
    border: none;
    cursor: pointer;
    border-radius: 8px;
    transition: background 0.2s;
}

.nav-hamburger:hover {
    background: rgba(255, 255, 255, 0.1);
}

.nav-hamburger span {
    display: block;
    width: 20px;
    height: 2px;
    background: rgba(255, 255, 255, 0.85);
    border-radius: 2px;
    transition: all 0.3s ease;
    transform-origin: center;
}

/* Hamburger open state */
.nav-hamburger.open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.nav-hamburger.open span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}
.nav-hamburger.open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Mobile nav */
.nav-mobile-menu {
    display: none;
    position: fixed;
    top: 76px;
    left: 16px;
    right: 16px;
    background: linear-gradient(180deg, rgba(30, 27, 75, 0.97), rgba(76, 29, 149, 0.95));
    backdrop-filter: blur(32px) saturate(1.6);
    -webkit-backdrop-filter: blur(32px) saturate(1.6);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(212, 175, 55, 0.15);
    padding: 12px;
    z-index: 999;
    flex-direction: column;
    gap: 2px;
    box-shadow:
        0 16px 48px rgba(0, 0, 0, 0.45),
        0 0 0 1px rgba(124, 58, 237, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.08);
    opacity: 0;
    transform: translateY(-8px) scale(0.97);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    pointer-events: none;
}

.nav-mobile-menu.open {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}

.nav.scrolled ~ .nav-mobile-menu,
.nav.scrolled + .nav-mobile-menu {
    background: rgba(253, 248, 243, 0.97);
    border-color: rgba(76, 29, 149, 0.1);
    box-shadow: var(--shadow-lg);
}

.nav.scrolled ~ .nav-mobile-menu .nav-mobile-link,
.nav.scrolled + .nav-mobile-menu .nav-mobile-link {
    color: var(--warm-gray);
}

.nav.scrolled ~ .nav-mobile-menu .nav-mobile-link:hover,
.nav.scrolled + .nav-mobile-menu .nav-mobile-link:hover,
.nav.scrolled ~ .nav-mobile-menu .nav-mobile-link[aria-current="page"],
.nav.scrolled + .nav-mobile-menu .nav-mobile-link[aria-current="page"] {
    color: var(--krishna-indigo);
    background: rgba(76, 29, 149, 0.08);
}

.nav-mobile-link {
    display: block;
    color: rgba(255, 255, 255, 0.85);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    padding: 14px 18px;
    border-radius: var(--radius-md);
    transition: all 0.2s;
}

.nav-mobile-link:hover {
    background: rgba(212, 175, 55, 0.1);
    color: white;
}

.nav-mobile-link[aria-current="page"] {
    color: white;
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.35), rgba(212, 175, 55, 0.12));
    font-weight: 600;
    box-shadow: inset 0 0 0 1px rgba(212, 175, 55, 0.1);
}

/* ========================================
   Responsive Breakpoints
   ======================================== */

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .nav-hamburger {
        display: flex;
    }

    .nav-mobile-menu {
        display: flex;
    }

    .nav {
        padding: 8px 16px;
        gap: 12px;
    }
}

@media (max-width: 480px) {
    .nav {
        top: 12px;
        padding: 6px 14px;
    }

    .nav-logo span:not(.nav-logo-icon) {
        font-size: 0.85rem;
    }

    .nav-mobile-menu {
        top: 64px;
        left: 12px;
        right: 12px;
    }
}