/* ── Base ── */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    overflow-x: hidden;
}

::selection {
    background: #14b8a6;
    color: #f0fdfa;
}

/* ── Navigation ── */
.nav-color {
    color: rgba(255, 255, 255, 0.9);
    transition: color 0.5s ease;
}

.nav-link {
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: rgba(255, 255, 255, 0.6);
    transition: width 0.4s ease;
}

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

#nav.scrolled {
    background: rgba(4, 47, 46, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

#nav.scrolled .nav-color {
    color: rgba(255, 255, 255, 0.95);
}

#nav.scrolled .nav-link {
    color: rgba(255, 255, 255, 0.75);
}

/* ── Mobile Menu ── */
#mobile-menu.open {
    opacity: 1;
    pointer-events: all;
}

#mobile-menu.open .mobile-link {
    animation: fadeUp 0.4s ease forwards;
    opacity: 0;
}

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

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.menu-line {
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    transform-origin: center;
}

body.menu-open .menu-line:first-child {
    transform: rotate(45deg) translate(3px, 3px);
}

body.menu-open .menu-line:last-child {
    transform: rotate(-45deg) translate(3px, -3px);
}

/* ── Hero ── */
.hero-eyebrow {
    animation: fadeDown 1s ease 0.3s both;
}

.hero-headline {
    animation: fadeUp 1s ease 0.5s both;
}

.hero-subtext {
    animation: fadeUp 1s ease 0.7s both;
}

.hero-cta {
    animation: fadeUp 1s ease 0.9s both;
}

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeDown {
    from {
        opacity: 0;
        transform: translateY(-16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ── Scroll Indicator ── */
.scroll-line {
    animation: scrollPulse 2s ease infinite;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 0.4; transform: scaleY(1); }
    50% { opacity: 0.1; transform: scaleY(0.6); }
}

/* ── Buttons ── */
.btn-primary {
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-secondary:hover {
    transform: translateY(-2px);
}

/* ── Eyebrow ── */
.eyebrow {
    letter-spacing: 0.3em;
}

/* ── Divider ── */
.divider-line {
    transition: opacity 0.6s ease;
}

/* ── Reveal Animations ── */
.reveal {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1),
                transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

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

@media (prefers-reduced-motion: no-preference) {
    .reveal {
        opacity: 0;
        transform: translateY(32px);
    }

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

/* ── Image hover ── */
img {
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Menu hover effects ── */
#menu ul li {
    transition: padding-left 0.3s ease;
}

#menu ul li:hover {
    padding-left: 8px;
}

#menu ul li:hover .font-serif {
    color: #0d9488;
}

/* ── Responsive ── */
@media (max-width: 768px) {
    .hero-headline {
        font-size: 2.75rem;
    }

    @media (min-width: 640px) {
        .hero-headline {
            font-size: 3.5rem;
        }
    }

    @media (min-width: 768px) {
        .hero-headline {
            font-size: 4.5rem;
        }
    }

    @media (min-width: 1024px) {
        .hero-headline {
            font-size: 5.5rem;
        }
    }
}

/* ── Focus styles ── */
a:focus-visible,
button:focus-visible {
    outline: 2px solid #14b8a6;
    outline-offset: 4px;
    border-radius: 2px;
}

/* ── Smooth scroll offset for fixed nav ── */
section[id] {
    scroll-margin-top: 80px;
}