/* ── Base & Utilities ── */
html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    overflow-x: hidden;
}

::selection {
    background-color: rgba(72, 187, 120, 0.2);
    color: #1A2744;
}

/* ── Buttons ── */
.btn-primary {
    background: linear-gradient(135deg, #48BB78 0%, #38A169 100%);
    color: #fff;
    border: none;
    border-radius: 1rem;
    padding: 0.875rem 2rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 15px rgba(72, 187, 120, 0.3);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(72, 187, 120, 0.4);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: #fff;
    color: #1A2744;
    border: 2px solid rgba(26, 39, 68, 0.1);
    border-radius: 1rem;
    padding: 0.8125rem 2rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-secondary:hover {
    border-color: #48BB78;
    color: #1A2744;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(26, 39, 68, 0.08);
}

/* ── Nav Links ── */
.nav-link {
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: #48BB78;
    border-radius: 1px;
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

.mobile-nav-link {
    display: block;
    transition: all 0.2s ease;
}

.mobile-nav-link:hover {
    padding-left: 0.5rem;
    color: #48BB78;
}

/* ── Hero Image ── */
.hero-image-wrapper {
    position: relative;
    overflow: hidden;
}

.hero-img {
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    display: block;
}

.hero-image-wrapper:hover .hero-img {
    transform: scale(1.03);
}

/* ── Feature Cards ── */
.feature-card {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Scroll Animations ── */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 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; }

/* ── Header Scrolled State ── */
header.scrolled {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    box-shadow: 0 1px 20px rgba(26, 39, 68, 0.06);
}

/* ── Mobile Menu Animation ── */
#mobile-menu {
    animation: slideDown 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ── Responsive ── */
@media (max-width: 767px) {
    .hero-image-wrapper {
        border-radius: 1.5rem;
    }
}