* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    overflow-x: hidden;
    color: var(--colour-text);
    background: var(--colour-background);
    font-family: var(--font-body);
    line-height: 1.6;
}

button,
input,
textarea,
select {
    font: inherit;
}

button {
    cursor: pointer;
}

a {
    color: inherit;
    text-decoration: none;
}

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

main {
    min-height: 70vh;
}

html,
body {
    min-height: 100%;
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1 0 auto;
}

@media (max-width: 980px) {
    .site-header {
        position: sticky;
        top: 8px;
        z-index: 1000;

        grid-template-columns: 1fr auto auto;
        overflow: visible;
    }

    .mobile-menu-button {
        display: grid;
        position: relative;
        z-index: 1003;

        width: 44px;
        height: 44px;
        place-items: center;

        border: 1px solid var(--dd-border);
        border-radius: 12px;

        color: var(--dd-text);
        background: rgba(255, 255, 255, 0.045);

        box-shadow:
            0 10px 25px rgba(0, 0, 0, 0.25);

        transition:
            transform var(--dd-transition-fast),
            border-color var(--dd-transition-fast),
            background var(--dd-transition-fast),
            box-shadow var(--dd-transition-fast);
    }

    .mobile-menu-button:hover,
    .mobile-menu-button.open {
        transform: translateY(-1px);
        border-color: var(--dd-border-accent);
        color: var(--dd-accent);
        background: var(--dd-accent-soft);
        box-shadow:
            0 14px 32px rgba(0, 0, 0, 0.3),
            0 0 24px rgba(57, 255, 20, 0.08);
    }

    .main-navigation {
        position: absolute;
        top: calc(100% + 10px);
        right: 0;
        left: 0;
        z-index: 1002;

        display: grid;
        gap: 8px;

        padding: 16px;

        border: 1px solid transparent;
        border-radius: 24px;

        background:
            radial-gradient(
                circle at top right,
                rgba(57, 255, 20, 0.07),
                transparent 35%
            ),
            rgba(8, 10, 15, 0.96);

        box-shadow:
            0 26px 70px rgba(0, 0, 0, 0.48);

        backdrop-filter: blur(24px);

        opacity: 0;
        visibility: hidden;
        pointer-events: none;

        transform: translateY(-10px) scale(0.985);

        transition:
            opacity 220ms ease,
            visibility 220ms ease,
            transform 220ms ease,
            border-color 220ms ease;
    }

    .main-navigation.open {
        opacity: 1;
        visibility: visible;
        pointer-events: auto;

        transform: translateY(0) scale(1);

        border-color: var(--dd-border);
    }

    .main-navigation a {
        display: flex;
        align-items: center;
        justify-content: space-between;

        width: 100%;
        min-height: 48px;
        padding: 12px 15px;

        border: 1px solid transparent;
        border-radius: 14px;

        color: var(--dd-text-muted);
        background: rgba(255, 255, 255, 0.018);

        font-size: 0.9rem;
        font-weight: 750;

        transition:
            color var(--dd-transition-fast),
            background var(--dd-transition-fast),
            border-color var(--dd-transition-fast),
            transform var(--dd-transition-fast);
    }

    .main-navigation a::before {
        width: 7px;
        height: 7px;
        flex: 0 0 auto;

        margin-right: 12px;

        border-radius: 50%;

        background: transparent;

        content: "";

        transition:
            background var(--dd-transition-fast),
            box-shadow var(--dd-transition-fast);
    }

    .main-navigation a::after {
        position: static;

        width: auto;
        height: auto;

        margin-left: auto;

        color: #68717e;
        background: none;

        content: "›";

        transform: none;

        font-size: 1.15rem;
    }

    .main-navigation a:hover,
    .main-navigation a.active {
        transform: translateX(3px);

        border-color: var(--dd-border);
        color: var(--dd-text);
        background: rgba(255, 255, 255, 0.045);
    }

    .main-navigation a:hover::before,
    .main-navigation a.active::before {
        background: var(--dd-accent);
        box-shadow:
            0 0 12px rgba(57, 255, 20, 0.75);
    }

    .main-navigation .lab-navigation-link {
        margin-top: 6px;

        border-color: var(--dd-border-accent);

        color: var(--dd-accent);

        background:
            linear-gradient(
                135deg,
                rgba(57, 255, 20, 0.1),
                rgba(57, 255, 20, 0.025)
            );
    }

    .main-navigation .lab-navigation-link::before {
        background: var(--dd-accent);
        box-shadow:
            0 0 12px rgba(57, 255, 20, 0.75);
    }

    .main-navigation .lab-navigation-link::after {
        content: "🧪";
        font-size: 0.95rem;
    }
}

@media (max-width: 980px) {
    .main-navigation {
        position: absolute;
        top: calc(100% + 10px);
        right: 0;
        left: 0;
        z-index: 1002;

        display: grid;
        grid-template-columns: 1fr;
        gap: 7px;

        max-height: calc(100dvh - 115px);
        padding: 14px;
        overflow-y: auto;

        border: 1px solid var(--dd-border);
        border-radius: 22px;

        background:
            radial-gradient(
                circle at top right,
                rgba(57, 255, 20, 0.07),
                transparent 38%
            ),
            rgba(8, 10, 15, 0.98);

        box-shadow: 0 26px 70px rgba(0, 0, 0, 0.48);
        backdrop-filter: blur(24px);

        opacity: 0;
        visibility: hidden;
        pointer-events: none;

        transform: translateY(-8px);

        transition:
            opacity 220ms ease,
            visibility 220ms ease,
            transform 220ms ease;
    }

    .main-navigation.open {
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
        transform: translateY(0);
    }

    .main-navigation a {
        display: flex;
        align-items: center;

        width: 100%;
        min-width: 0;
        min-height: 46px;
        margin: 0;
        padding: 11px 14px;

        border: 1px solid transparent;
        border-radius: 13px;

        color: var(--dd-text-muted);
        background: rgba(255, 255, 255, 0.025);

        font-size: 0.88rem;
        font-weight: 750;
        text-align: left;
    }

    .main-navigation a:hover,
    .main-navigation a.active {
        transform: none;
        border-color: var(--dd-border);
        color: var(--dd-text);
        background: rgba(255, 255, 255, 0.055);
    }

    .main-navigation .lab-navigation-link {
        width: 100%;
        margin-top: 3px;
        color: var(--dd-accent);
        border-color: var(--dd-border-accent);
        background: var(--dd-accent-soft);
    }
}

@media (max-width: 520px) {
    .main-navigation {
        max-height: calc(100dvh - 104px);
        padding: 10px;
        gap: 5px;
    }

    .main-navigation a {
        min-height: 42px;
        padding: 9px 12px;
    }
}

/* Mobile navigation opening animation */
@media (max-width: 980px) {

    .main-navigation a {
        opacity: 0;
        transform: translateY(10px);
    }

    .main-navigation.open a {
        animation: menuFade .28s forwards;
    }

    .main-navigation.open a:nth-child(1) { animation-delay: .02s; }
    .main-navigation.open a:nth-child(2) { animation-delay: .05s; }
    .main-navigation.open a:nth-child(3) { animation-delay: .08s; }
    .main-navigation.open a:nth-child(4) { animation-delay: .11s; }
    .main-navigation.open a:nth-child(5) { animation-delay: .14s; }
    .main-navigation.open a:nth-child(6) { animation-delay: .17s; }
}

@keyframes menuFade {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

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