/* ===== BASE ===== */
*, *::before, *::after {
    box-sizing: border-box;
}

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

body {
    margin: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* ===== NAVBAR SCROLL ===== */
#navbar.scrolled {
    background: rgba(6, 14, 26, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(45, 212, 191, 0.08);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

#navbar.scrolled .logo-text {
    color: #ffffff;
}

/* ===== MOBILE MENU ===== */
.mobile-link {
    display: block;
    padding: 0.5rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.mobile-link:last-child {
    border-bottom: none;
}

/* ===== SCROLL REVEAL (progressive enhancement) ===== */
@media (prefers-reduced-motion: no-preference) {
    .reveal {
        opacity: 0;
        transform: translateY(30px);
        transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
    }

    .reveal.revealed {
        opacity: 1;
        transform: translateY(0);
    }

    .reveal-delay-1 { transition-delay: 0.1s; }
    .reveal-delay-2 { transition-delay: 0.2s; }
    .reveal-delay-3 { transition-delay: 0.3s; }
    .reveal-delay-4 { transition-delay: 0.4s; }
}

/* ===== SELECTION ===== */
::selection {
    background: rgba(45, 212, 191, 0.3);
    color: #ffffff;
}

/* ===== FOCUS ===== */
a:focus-visible,
button:focus-visible {
    outline: 2px solid #2dd4bf;
    outline-offset: 2px;
    border-radius: 4px;
}

/* ===== LINK UNDERLINE ANIMATION ===== */
.hover-underline {
    position: relative;
}

.hover-underline::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: #2dd4bf;
    transition: width 0.3s ease;
}

.hover-underline:hover::after {
    width: 100%;
}

/* ===== IMAGE SHADOW ===== */
img {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

/* ===== CARD HOVER ===== */
.group:hover .group-hover\\:scale-105 {
    transform: scale(1.05);
}

/* ===== CUSTOM SELECTION FOR FORMS ===== */
input, textarea {
    background: rgba(10, 22, 40, 0.8);
    border: 1px solid rgba(45, 212, 191, 0.2);
    color: #ffffff;
    border-radius: 8px;
    padding: 0.75rem 1rem;
    font-family: inherit;
    font-size: 1rem;
    width: 100%;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

input:focus, textarea:focus {
    outline: none;
    border-color: #2dd4bf;
    box-shadow: 0 0 0 3px rgba(45, 212, 191, 0.15);
}

input::placeholder, textarea::placeholder {
    color: rgba(133, 157, 197, 0.6);
}

/* ===== TOAST NOTIFICATION ===== */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: #0a1628;
    border: 1px solid #2dd4bf;
    color: #ffffff;
    padding: 1rem 1.5rem;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
    z-index: 1000;
    transform: translateY(120%);
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.22, 1, 0.36, 1);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

.toast svg {
    flex-shrink: 0;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    html {
        scroll-padding-top: 70px;
    }

    #hero h1 {
        font-size: 2.75rem;
        line-height: 1.1;
    }

    .reveal {
        opacity: 1;
        transform: none;
    }
}

@media (max-width: 640px) {
    #hero h1 {
        font-size: 2.25rem;
    }
}