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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    margin: 0;
    overflow-x: hidden;
}

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

::selection {
    background-color: rgba(13, 149, 138, 0.2);
    color: #0f292e;
}

/* ========== NAV SCROLL STATE ========== */
#nav.scrolled {
    background-color: rgba(15, 28, 41, 0.95);
    backdrop-filter: blur(12px);
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.05);
}

.nav-link-color {
    color: #ffffff;
}

#nav.scrolled .nav-link-color {
    color: #ffffff;
}

/* ========== HERO ANIMATIONS ========== */
.hero-subtitle {
    animation: slideUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.3s forwards;
}

.hero-title {
    animation: slideUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.5s forwards;
}

.hero-desc {
    animation: slideUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.7s forwards;
}

.hero-ctas {
    animation: slideUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.9s forwards;
}

.hero-scroll {
    animation: fadeIn 1s ease 1.5s forwards;
    opacity: 0;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(100%);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* ========== SCROLL REVEAL ========== */
.reveal {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* Stagger delays for grid items */
.service-card:nth-child(1) { transition-delay: 0.05s; }
.service-card:nth-child(2) { transition-delay: 0.1s; }
.service-card:nth-child(3) { transition-delay: 0.15s; }
.service-card:nth-child(4) { transition-delay: 0.2s; }
.service-card:nth-child(5) { transition-delay: 0.25s; }
.service-card:nth-child(6) { transition-delay: 0.3s; }

.testimonial-card:nth-child(1) { transition-delay: 0.05s; }
.testimonial-card:nth-child(2) { transition-delay: 0.15s; }
.testimonial-card:nth-child(3) { transition-delay: 0.25s; }

.gallery-item:nth-child(1) { transition-delay: 0.05s; }
.gallery-item:nth-child(2) { transition-delay: 0.1s; }
.gallery-item:nth-child(3) { transition-delay: 0.15s; }
.gallery-item:nth-child(4) { transition-delay: 0.2s; }
.gallery-item:nth-child(5) { transition-delay: 0.25s; }

/* ========== MOBILE MENU ========== */
#mobile-menu.open {
    opacity: 1;
    pointer-events: all;
}

#mobile-menu.open .mobile-link {
    animation: mobileLinkIn 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

#mobile-menu.open .mobile-link:nth-child(1) { animation-delay: 0.05s; }
#mobile-menu.open .mobile-link:nth-child(2) { animation-delay: 0.1s; }
#mobile-menu.open .mobile-link:nth-child(3) { animation-delay: 0.15s; }
#mobile-menu.open .mobile-link:nth-child(4) { animation-delay: 0.2s; }
#mobile-menu.open .mobile-link:nth-child(5) { animation-delay: 0.25s; }
#mobile-menu.open .mobile-link:nth-child(6) { animation-delay: 0.3s; }

@keyframes mobileLinkIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========== HAMBURGER ========== */
.menu-line {
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1),
                opacity 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

#menu-btn.active .menu-line:nth-child(1) {
    transform: rotate(45deg) translate(4px, 4px);
}

#menu-btn.active .menu-line:nth-child(2) {
    opacity: 0;
}

#menu-btn.active .menu-line:nth-child(3) {
    transform: rotate(-45deg) translate(4px, -4px);
    width: 1.5rem;
}

/* ========== TESTIMONIAL CARDS ========== */
.testimonial-card {
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1),
                box-shadow 0.4s ease;
}

.testimonial-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.08);
}

/* ========== SCROLLBAR ========== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f5f5f4;
}

::-webkit-scrollbar-thumb {
    background: #94a3b8;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #64748b;
}