/* ── Base & Typography ── */
*, *::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;
}

::selection {
    background: rgba(29, 180, 136, 0.3);
    color: #fff;
}

/* ── Scroll Reveal (progressive enhancement) ── */
@media (prefers-reduced-motion: no-preference) {
    .reveal {
        opacity: 0;
        transform: translateY(32px);
        transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
                    transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    }

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

    .reveal-tag {
        opacity: 0;
        transform: translateY(16px);
        transition: opacity 0.6s ease, transform 0.6s ease;
    }

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

    .reveal-heading {
        opacity: 0;
        transform: translateY(24px);
        transition: opacity 0.7s ease, transform 0.7s ease;
    }

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

    .reveal-body {
        opacity: 0;
        transform: translateY(20px);
        transition: opacity 0.7s ease, transform 0.7s ease;
    }

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

/* ── Hero Animations ── */
@media (prefers-reduced-motion: no-preference) {
    .hero-subtitle {
        opacity: 0;
        transform: translateY(20px);
        animation: heroFadeUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.2s forwards;
    }

    .hero-title {
        opacity: 0;
        transform: translateY(32px);
        animation: heroFadeUp 0.9s cubic-bezier(0.16, 1, 0.3, 1) 0.4s forwards;
    }

    .hero-body {
        opacity: 0;
        transform: translateY(24px);
        animation: heroFadeUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.6s forwards;
    }

    .hero-cta {
        opacity: 0;
        transform: translateY(20px);
        animation: heroFadeUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.8s forwards;
    }

    @keyframes heroFadeUp {
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }
}

/* ── Navbar ── */
#navbar {
    background: transparent;
}

#navbar.scrolled {
    background: rgba(5, 13, 26, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: 0 1px 40px rgba(0, 0, 0, 0.3);
}

/* ── Buttons ── */
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: #1DB888;
    color: #050D1A;
    font-weight: 600;
    font-size: 0.9rem;
    letter-spacing: 0.05em;
    padding: 1rem 2rem;
    border-radius: 100px;
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    background: #3FD4A8;
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(29, 180, 136, 0.3);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: transparent;
    color: #fff;
    font-weight: 500;
    font-size: 0.9rem;
    letter-spacing: 0.05em;
    padding: 1rem 2rem;
    border-radius: 100px;
    text-decoration: none;
    border: 1px solid rgba(255, 255, 255, 0.25);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.btn-secondary:hover {
    border-color: rgba(255, 255, 255, 0.6);
    background: rgba(255, 255, 255, 0.06);
    transform: translateY(-2px);
}

/* ── Input Fields ── */
.input-field {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 1rem 1.25rem;
    color: #fff;
    font-family: 'Inter', system-ui, sans-serif;
    font-size: 1rem;
    transition: all 0.3s ease;
    outline: none;
    width: 100%;
}

.input-field::placeholder {
    color: rgba(255, 255, 255, 0.25);
}

.input-field:hover {
    border-color: rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.06);
}

.input-field:focus {
    border-color: #1DB888;
    background: rgba(29, 180, 136, 0.06);
    box-shadow: 0 0 0 3px rgba(29, 180, 136, 0.1);
}

/* ── Scroll Indicator ── */
.scroll-indicator {
    animation: scrollBounce 2s ease-in-out infinite;
}

@keyframes scrollBounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(6px); }
}

/* ── Mobile Link ── */
.mobile-link {
    display: block;
    padding: 0.5rem 0;
}

/* ── Image Hover ── */
img {
    display: block;
    max-width: 100%;
    height: auto;
}

/* ── Responsive ── */
@media (max-width: 768px) {
    .font-serif {
        word-spacing: -0.02em;
    }
}