/* ===== RESET & BASE ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    min-height: 100vh;
    overflow-x: hidden;
}

img {
    display: block;
    max-width: 100%;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

/* ===== SCROLL REVEAL (progressive enhancement) ===== */
@media (prefers-reduced-motion: no-preference) {
    .reveal-up {
        opacity: 0;
        transform: translateY(30px);
        transition: opacity 0.7s ease, transform 0.7s ease;
    }
    .reveal-left {
        opacity: 0;
        transform: translateX(-40px);
        transition: opacity 0.7s ease, transform 0.7s ease;
    }
    .reveal-right {
        opacity: 0;
        transform: translateX(40px);
        transition: opacity 0.7s ease, transform 0.7s ease;
    }
    .reveal-up.revealed,
    .reveal-left.revealed,
    .reveal-right.revealed {
        opacity: 1;
        transform: translate(0, 0);
    }
}

/* ===== NAV ===== */
#nav {
    background: transparent;
    transition: background 0.4s ease, box-shadow 0.4s ease, padding 0.4s ease;
}

#nav.scrolled {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: 0 1px 20px rgba(124, 58, 237, 0.08);
}

#nav.scrolled .menu-line {
    background: #7e22ce;
}

/* ===== MOBILE MENU ===== */
.mobile-link {
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

#mobile-menu.open .mobile-link {
    opacity: 1;
    transform: translateY(0);
}

#mobile-menu.open .mobile-link:nth-child(1) { transition-delay: 0.05s; }
#mobile-menu.open .mobile-link:nth-child(2) { transition-delay: 0.1s; }
#mobile-menu.open .mobile-link:nth-child(3) { transition-delay: 0.15s; }
#mobile-menu.open .mobile-link:nth-child(4) { transition-delay: 0.2s; }
#mobile-menu.open .mobile-link:nth-child(5) { transition-delay: 0.25s; }

/* ===== MENU TABS ===== */
.menu-tab {
    background: transparent;
    border: none;
    cursor: pointer;
    color: #7e22ce;
    opacity: 0.5;
    transition: opacity 0.3s ease, background 0.3s ease;
}

.menu-tab.active {
    opacity: 1;
    background: white;
    box-shadow: 0 2px 12px rgba(124, 58, 237, 0.15);
    color: #7e22ce;
}

/* ===== SMOOTH SECTION TRANSITIONS ===== */
section {
    position: relative;
}

/* ===== CUSTOM SCROLLBAR ===== */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: #faf5ff;
}
::-webkit-scrollbar-thumb {
    background: linear-gradient(to bottom, #c084fc, #fbbf24);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(to bottom, #a855f7, #f59e0b);
}