:root {
    color-scheme: dark;
    --ink: #071b2a;
    --ink-deep: #04121d;
    --paper: #f7fbfd;
    --perfect-blue: #2a92c8;
    --signal-blue: #78c8ef;
    --plum: #7b2d78;
    --mist: #b9cfda;
    --display: "Avenir Next Condensed", "Arial Narrow", "Helvetica Neue", sans-serif;
    --body: "Avenir Next", Avenir, "Segoe UI", Helvetica, Arial, sans-serif;
    --utility: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    min-width: 320px;
    background: var(--ink-deep);
}

body {
    min-width: 320px;
    min-height: 100vh;
    min-height: 100svh;
    margin: 0;
    overflow-x: hidden;
    color: var(--paper);
    background:
        radial-gradient(circle at 72% 42%, rgba(42, 146, 200, 0.16), transparent 30rem),
        linear-gradient(145deg, var(--ink) 0%, var(--ink-deep) 72%);
    font-family: var(--body);
    -webkit-font-smoothing: antialiased;
}

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

.holding-shell {
    position: relative;
    display: grid;
    grid-template-rows: auto 1fr auto;
    min-height: 100vh;
    min-height: 100svh;
    width: min(100%, 1600px);
    margin: 0 auto;
    padding: clamp(1.5rem, 3.6vw, 4rem) clamp(1.25rem, 5vw, 5.5rem) clamp(1.4rem, 3vw, 3rem);
    isolation: isolate;
}

.holding-shell::before {
    position: absolute;
    z-index: -1;
    inset: clamp(0.7rem, 2vw, 2rem);
    border: 1px solid rgba(120, 200, 239, 0.12);
    border-radius: 0.25rem;
    content: "";
    pointer-events: none;
}

.brand {
    position: relative;
    z-index: 3;
    width: min(18rem, 58vw);
    animation: resolve-in 700ms 80ms both cubic-bezier(0.2, 0.8, 0.2, 1);
}

.brand__wordmark {
    width: 100%;
    height: auto;
    filter: drop-shadow(0 0.7rem 1.5rem rgba(0, 0, 0, 0.2));
}

.hero {
    display: grid;
    grid-template-columns: minmax(0, 0.92fr) minmax(26rem, 1.08fr);
    align-items: center;
    gap: clamp(2rem, 5vw, 6rem);
    min-height: 0;
    padding: clamp(3.2rem, 7vh, 6rem) 0;
}

.hero__copy {
    position: relative;
    z-index: 2;
}

.hero__title {
    max-width: 7.2em;
    margin: 0;
    color: var(--paper);
    font-family: var(--display);
    font-size: clamp(4.2rem, 8.25vw, 9rem);
    font-stretch: condensed;
    font-weight: 800;
    letter-spacing: -0.065em;
    line-height: 0.84;
    text-transform: uppercase;
}

.hero__title span {
    display: block;
    animation: resolve-in 850ms both cubic-bezier(0.16, 1, 0.3, 1);
}

.hero__title span:first-child {
    animation-delay: 160ms;
}

.hero__title span:last-child {
    animation-delay: 260ms;
}

.hero__intro {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: clamp(1.75rem, 4vh, 3rem) 0 0;
    color: var(--mist);
    font-size: clamp(1.05rem, 1.55vw, 1.35rem);
    font-weight: 450;
    letter-spacing: 0.01em;
    animation: resolve-in 800ms 390ms both cubic-bezier(0.16, 1, 0.3, 1);
}

.hero__intro::before {
    width: clamp(2.5rem, 5vw, 5.5rem);
    height: 2px;
    background: linear-gradient(90deg, var(--perfect-blue), var(--signal-blue));
    content: "";
}

.paper-field {
    position: relative;
    min-height: clamp(28rem, 58vh, 44rem);
    perspective: 1200px;
}

.paper-field__grid {
    position: absolute;
    inset: 6% 0 4% 5%;
    opacity: 0.34;
    background-image:
        linear-gradient(rgba(120, 200, 239, 0.15) 1px, transparent 1px),
        linear-gradient(90deg, rgba(120, 200, 239, 0.15) 1px, transparent 1px);
    background-size: 2.6rem 2.6rem;
    -webkit-mask-image: linear-gradient(105deg, transparent 2%, #000 42%, #000 82%, transparent 100%);
    mask-image: linear-gradient(105deg, transparent 2%, #000 42%, #000 82%, transparent 100%);
    animation: grid-resolve 1.2s 300ms both ease-out;
}

.paper-field__orbit {
    position: absolute;
    top: 13%;
    right: 2%;
    width: min(32rem, 80%);
    aspect-ratio: 1;
    border: 1px solid rgba(120, 200, 239, 0.28);
    border-radius: 50%;
    box-shadow: 0 0 5rem rgba(42, 146, 200, 0.08) inset;
    animation: grid-resolve 1.1s 480ms both ease-out;
}

.paper-field__plane {
    position: absolute;
    top: 21%;
    right: 11%;
    width: min(29rem, 72%);
    aspect-ratio: 1.38;
    border: 1px solid rgba(247, 251, 253, 0.16);
    background: linear-gradient(135deg, rgba(247, 251, 253, 0.08), rgba(42, 146, 200, 0.03));
    box-shadow: 0 2.5rem 7rem rgba(0, 0, 0, 0.3);
    transform: rotate(-7deg) skewY(1deg);
    backdrop-filter: blur(2px);
}

.exam-paper {
    --paper-transform: translate(-50%, -50%);
    position: absolute;
    top: 50%;
    left: 50%;
    width: clamp(9.5rem, 12vw, 13rem);
    height: auto;
    border: 1px solid rgba(255, 255, 255, 0.72);
    box-shadow: 0 2.4rem 4.2rem rgba(0, 0, 0, 0.42);
    transform: var(--paper-transform);
    transform-origin: center bottom;
    animation: paper-settle 950ms both cubic-bezier(0.16, 1, 0.3, 1);
}

.exam-paper--higher {
    --paper-transform: translate(-53%, -49%) rotate(-2deg);
    z-index: 3;
    animation-delay: 300ms;
}

.exam-paper--national {
    --paper-transform: translate(-103%, -45%) rotate(-14deg);
    z-index: 2;
    animation-delay: 390ms;
}

.exam-paper--advanced {
    --paper-transform: translate(-5%, -44%) rotate(11deg);
    z-index: 1;
    animation-delay: 480ms;
}

.paper-field__node {
    position: absolute;
    z-index: 4;
    width: 0.55rem;
    aspect-ratio: 1;
    border: 2px solid var(--ink);
    border-radius: 50%;
    background: var(--signal-blue);
    box-shadow: 0 0 0 0.35rem rgba(120, 200, 239, 0.12);
    animation: grid-resolve 700ms 700ms both ease-out;
}

.paper-field__node--one {
    top: 18%;
    left: 27%;
}

.paper-field__node--two {
    right: 8%;
    bottom: 26%;
}

.paper-field__node--three {
    bottom: 13%;
    left: 18%;
    background: var(--plum);
    box-shadow: 0 0 0 0.35rem rgba(123, 45, 120, 0.14);
}

.holding-footer {
    position: relative;
    z-index: 3;
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: 2rem;
    color: rgba(185, 207, 218, 0.76);
    font-family: var(--utility);
    font-size: clamp(0.68rem, 0.8vw, 0.78rem);
    letter-spacing: 0.08em;
    line-height: 1.5;
    text-transform: uppercase;
    animation: resolve-in 700ms 620ms both ease-out;
}

.holding-footer p {
    margin: 0;
}

.holding-footer p:last-child {
    text-align: right;
}

@keyframes resolve-in {
    from {
        opacity: 0;
        transform: translateY(1.1rem);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes paper-settle {
    from {
        opacity: 0;
        transform: var(--paper-transform) translateY(2.2rem);
    }
    to {
        opacity: 1;
        transform: var(--paper-transform) translateY(0);
    }
}

@keyframes grid-resolve {
    from {
        opacity: 0;
        transform: scale(0.97);
    }
}

@media (max-width: 900px) {
    body {
        overflow-y: auto;
    }

    .hero {
        grid-template-columns: 1fr;
        gap: 1.25rem;
        padding: 4rem 0 2rem;
    }

    .hero__title {
        max-width: 8em;
        font-size: clamp(3.9rem, 14vw, 7rem);
    }

    .paper-field {
        min-height: clamp(22rem, 52vw, 33rem);
    }

    .paper-field__grid {
        inset: 0 2% 0 0;
    }

    .paper-field__orbit {
        top: 0;
        right: 9%;
        width: min(26rem, 72%);
    }

    .paper-field__plane {
        top: 8%;
        right: 16%;
    }

    .exam-paper {
        top: 44%;
        width: clamp(8.5rem, 25vw, 12rem);
    }
}

@media (max-width: 560px) {
    .holding-shell {
        padding: 1.4rem 1.2rem 1.3rem;
    }

    .holding-shell::before {
        inset: 0.6rem;
    }

    .brand {
        width: min(15rem, 64vw);
    }

    .hero {
        padding-top: 3.4rem;
    }

    .hero__title {
        font-size: clamp(3.25rem, 17vw, 5.2rem);
        letter-spacing: -0.055em;
        line-height: 0.87;
    }

    .hero__intro {
        align-items: flex-start;
        font-size: 1rem;
    }

    .paper-field {
        min-height: 21rem;
        margin: 0 -0.4rem;
    }

    .paper-field__plane {
        right: 10%;
        width: 76%;
    }

    .exam-paper {
        width: clamp(7.4rem, 34vw, 9.5rem);
    }

    .holding-footer {
        display: grid;
        gap: 0.45rem;
    }

    .holding-footer p:last-child {
        text-align: left;
    }
}

@media (max-height: 720px) and (min-width: 901px) {
    .hero {
        padding: 2.25rem 0;
    }

    .paper-field {
        min-height: 27rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        animation-duration: 0.01ms !important;
        animation-delay: 0ms !important;
        animation-iteration-count: 1 !important;
    }
}