@charset "UTF-8";

:root {
    --color-ink: #1b1d1c;
    --color-paper: #f2f0e8;
    --color-line: rgba(27, 29, 28, 0.2);
    --color-accent: #ff5c35;
    --color-night: #101820;
    --color-sage: #c6d1bc;
    --font-sans: "Helvetica Neue", Helvetica, Arial, sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--color-ink);
    background: var(--color-paper);
    font-family: var(--font-sans);
    -webkit-font-smoothing: antialiased;
}

button,
a {
    color: inherit;
}

a {
    text-decoration: none;
}

.l-inner {
    width: min(90vw, 1280px);
    margin-inline: auto;
}

.l-header {
    position: fixed;
    z-index: 50;
    top: 0;
    left: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 20px 5vw;
    color: var(--color-paper);
    mix-blend-mode: difference;
    pointer-events: none;
}

.l-header__title {
    margin: 0;
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.18em;
}

.c-replay-button {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 0;
    border: 0;
    background: transparent;
    font: inherit;
    font-size: 0.75rem;
    letter-spacing: 0.12em;
    cursor: pointer;
    pointer-events: auto;
}

.c-replay-button__icon {
    display: grid;
    width: 28px;
    aspect-ratio: 1;
    place-items: center;
    border: 1px solid currentColor;
    border-radius: 50%;
    font-size: 1rem;
    transition: transform 0.3s ease;
}

.p-intro {
    display: grid;
    min-height: 100svh;
    padding-block: 120px 56px;
    align-items: end;
    background:
        linear-gradient(90deg, transparent 0 calc(50% - 0.5px), var(--color-line) calc(50% - 0.5px) calc(50% + 0.5px), transparent calc(50% + 0.5px)),
        var(--color-paper);
}

.p-intro__eyebrow {
    margin: 0 0 20px;
    color: var(--color-accent);
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.2em;
}

.p-intro__title {
    margin: 0;
    font-size: clamp(3.5rem, 14vw, 11rem);
    font-weight: 500;
    letter-spacing: -0.07em;
    line-height: 0.82;
}

.p-intro__lead {
    max-width: 33rem;
    margin: 32px 0 0;
    font-size: clamp(0.875rem, 1.5vw, 1rem);
    line-height: 1.9;
}

.p-intro__nav {
    display: grid;
    margin-top: 56px;
    border-top: 1px solid var(--color-line);
}

.p-intro__link {
    display: flex;
    justify-content: space-between;
    padding: 16px 0;
    border-bottom: 1px solid var(--color-line);
    font-size: 0.75rem;
    letter-spacing: 0.12em;
    transition: padding 0.3s ease, color 0.3s ease;
}

.p-intro__link::after {
    content: "↘";
}

.p-demo {
    position: relative;
    min-height: 100svh;
    scroll-margin-top: 0;
}

.p-demo__inner {
    display: grid;
    min-height: 100svh;
}

.p-demo__copy,
.p-demo__stage {
    display: flex;
    min-width: 0;
    padding: 56px 5vw;
}

.p-demo__copy {
    flex-direction: column;
    justify-content: flex-end;
    min-height: 42svh;
}

.p-demo__number {
    margin: 0 auto auto 0;
    font-size: 0.75rem;
    letter-spacing: 0.16em;
}

.p-demo__title {
    margin: 0;
    font-size: clamp(2.75rem, 8vw, 7.5rem);
    font-weight: 500;
    letter-spacing: -0.06em;
    line-height: 0.9;
}

.p-demo__description {
    max-width: 28rem;
    margin: 28px 0 0;
    font-size: 0.875rem;
    line-height: 1.8;
}

.p-demo__stage {
    position: relative;
    min-height: 58svh;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.p-demo--line {
    color: var(--color-paper);
    background: var(--color-ink);
}

.p-demo--line .p-demo__stage {
    background: var(--color-accent);
}

.p-demo--arrow {
    background: var(--color-sage);
}

.p-demo--arrow .p-demo__stage {
    color: var(--color-paper);
    background: var(--color-night);
}

.p-demo--chevron {
    color: var(--color-ink);
    background: var(--color-paper);
}

.p-demo--chevron .p-demo__stage {
    background: #e4d9ff;
}

.p-demo--chevron-horizontal {
    color: var(--color-paper);
    background: var(--color-night);
}

.p-demo--chevron-horizontal .p-demo__stage {
    color: var(--color-ink);
    background: var(--color-paper);
}

.c-scroll-cue {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.c-scroll-cue__label {
    font-size: 0.625rem;
    font-weight: 700;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    writing-mode: vertical-rl;
}

.c-scroll-cue--line {
    gap: 20px;
}

.c-scroll-cue__line {
    position: relative;
    display: block;
    width: 1px;
    height: 112px;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.3);
}

.c-scroll-cue__line::after {
    position: absolute;
    inset: 0;
    background: currentColor;
    content: "";
    transform: scaleY(0);
    transform-origin: top;
    animation: line-stretch 2.2s cubic-bezier(0.77, 0, 0.18, 1) infinite;
}

.c-scroll-cue--arrow {
    gap: 24px;
}

.c-scroll-cue__arrow {
    width: 32px;
    height: 96px;
    overflow: visible;
}

.c-scroll-cue__arrow path {
    fill: none;
    stroke: currentColor;
    stroke-width: 1.5;
    stroke-dasharray: 1;
    stroke-dashoffset: 1;
    vector-effect: non-scaling-stroke;
    animation: arrow-draw 2.4s cubic-bezier(0.65, 0, 0.35, 1) infinite;
}

.c-scroll-cue--chevron {
    gap: 28px;
}

.c-scroll-cue--chevron-horizontal {
    gap: 18px;
}

.c-scroll-cue__label-horizontal {
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    text-transform: uppercase;
}

.c-scroll-cue__chevrons {
    display: grid;
    gap: 2px;
}

.c-scroll-cue__chevrons--double {
    gap: 0;
}

.c-scroll-cue__chevron {
    display: block;
    width: 24px;
    aspect-ratio: 1;
    border-right: 1.5px solid currentColor;
    border-bottom: 1.5px solid currentColor;
    opacity: 0;
    transform: rotate(45deg) translate(-6px, -6px);
    animation: chevron-fall 1.8s ease-in-out infinite;
}

.c-scroll-cue__chevron:nth-child(2) {
    animation-delay: 0.18s;
}

.c-scroll-cue__chevron:nth-child(3) {
    animation-delay: 0.36s;
}

.is-replaying .c-scroll-cue__line::after,
.is-replaying .c-scroll-cue__arrow path,
.is-replaying .c-scroll-cue__chevron {
    animation: none;
}

.l-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 32px 5vw;
    color: var(--color-paper);
    background: var(--color-ink);
    font-size: 0.6875rem;
    letter-spacing: 0.12em;
}

.l-footer p {
    margin: 0;
}

.l-footer__link {
    padding-block: 4px;
    border-bottom: 1px solid currentColor;
}

@keyframes line-stretch {
    0% {
        transform: scaleY(0);
        transform-origin: top;
    }
    42% {
        transform: scaleY(1);
        transform-origin: top;
    }
    58% {
        transform: scaleY(1);
        transform-origin: bottom;
    }
    100% {
        transform: scaleY(0);
        transform-origin: bottom;
    }
}

@keyframes arrow-draw {
    0%, 12% {
        opacity: 0;
        stroke-dashoffset: 1;
        transform: translateY(-8px);
    }
    50%, 72% {
        opacity: 1;
        stroke-dashoffset: 0;
        transform: translateY(0);
    }
    100% {
        opacity: 0;
        stroke-dashoffset: 0;
        transform: translateY(10px);
    }
}

@keyframes chevron-fall {
    0%, 20% {
        opacity: 0;
        transform: rotate(45deg) translate(-6px, -6px);
    }
    48% {
        opacity: 1;
    }
    80%, 100% {
        opacity: 0;
        transform: rotate(45deg) translate(4px, 4px);
    }
}

@media (min-width: 768px) {
    .l-header {
        padding-block: 28px;
    }

    .p-intro {
        padding-block: 160px 72px;
    }

    .p-intro__lead {
        margin-left: 50%;
    }

    .p-intro__nav {
        grid-template-columns: repeat(4, 1fr);
        gap: 32px;
    }

    .p-demo__inner {
        grid-template-columns: 1fr 1fr;
    }

    .p-demo__copy,
    .p-demo__stage {
        min-height: 100svh;
        padding-block: 88px;
    }

    .p-demo__copy {
        padding-right: 7vw;
    }

    .p-demo--arrow .p-demo__copy,
    .p-demo--chevron .p-demo__copy,
    .p-demo--chevron-horizontal .p-demo__copy {
        order: 2;
    }
}

@media (hover: hover) {
    .c-replay-button:hover .c-replay-button__icon {
        transform: rotate(180deg);
    }

    .p-intro__link:hover {
        padding-inline: 12px;
        color: var(--color-accent);
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.001ms;
        animation-iteration-count: 1;
        scroll-behavior: auto;
        transition-duration: 0.001ms;
    }
}