/* The landing page. Everything interactive here is wired up in js/landing.js. */

section {
    position: relative;
}

.section-head {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 64px;
}

.section-head .t-overline {
    margin-bottom: var(--s-s);
}

/* ---- Hero ---- */

.hero {
    padding: 48px 0 80px;
    overflow-x: clip;
}

.hero::before {
    content: "";
    position: absolute;
    inset: -20% -10% auto auto;
    width: 900px;
    height: 900px;
    background:
        radial-gradient(closest-side, color-mix(in srgb, var(--secondary) 70%, transparent), transparent),
        radial-gradient(closest-side at 30% 70%, color-mix(in srgb, var(--theme-blue-secondary) 50%, transparent), transparent);
    opacity: 0.7;
    pointer-events: none;
    z-index: -1;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.05fr 1fr;
    align-items: center;
    gap: 64px;
}

.hero-copy {
    display: grid;
    gap: var(--s-l);
}

.hero-copy .t-body0 {
    max-width: 30ch;
    opacity: 0.85;
}

.hero-actions {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--s-m);
}

/* A highlighter stroke drawn under "stick" */
.stick {
    position: relative;
    white-space: nowrap;
}

.stick::after {
    content: "";
    position: absolute;
    left: -2%;
    right: -2%;
    bottom: 0.02em;
    height: 0.3em;
    border-radius: var(--r-full);
    background: var(--secondary);
    opacity: 0.8;
    z-index: -1;
    transform: scaleX(0);
    transform-origin: left;
    animation: stroke 0.8s 0.6s var(--ease-out) forwards;
}

@keyframes stroke {
    to {
        transform: scaleX(1);
    }
}

.hero-demo {
    position: relative;
    display: flex;
    justify-content: center;
    padding: 40px 0;
}

.chip {
    position: absolute;
    z-index: 2;
    padding: 10px 16px;
    border-radius: var(--r-full);
    background: var(--background-secondary);
    box-shadow: var(--shadow-soft);
    font-size: 15px;
    font-weight: 700;
    white-space: nowrap;
    animation: bob 6s ease-in-out infinite;
}

.chip-streak {
    top: 0;
    left: 0;
}

.chip-review {
    bottom: 8px;
    right: 0;
    color: var(--text-primary);
    animation-delay: -3s;
}

@keyframes bob {
    50% {
        transform: translateY(-10px) rotate(-1.5deg);
    }
}

/* ---- Practice demo ---- */

.practice {
    position: relative;
    width: min(420px, 100%);
    padding: var(--s-l);
    border-radius: var(--r-panel);
    background: var(--background-secondary);
    box-shadow: var(--shadow-card);
    display: grid;
    gap: var(--s-m);
}

.practice-top {
    display: flex;
    align-items: center;
    gap: var(--s-m);
}

.progress {
    flex: 1;
    height: 10px;
    border-radius: var(--r-full);
    background: var(--gray10);
    overflow: hidden;
}

@media (prefers-color-scheme: dark) {
    .progress {
        background: var(--gray90);
    }
}

.progress span {
    display: block;
    height: 100%;
    width: calc(var(--progress, 0) * 100%);
    border-radius: inherit;
    background: var(--progress-bar-background);
    transition: width 0.5s var(--ease-spring);
}

.practice-count {
    font-size: 14px;
    font-weight: 700;
    color: var(--muted);
    font-variant-numeric: tabular-nums;
}

.practice-card {
    display: grid;
    justify-items: center;
    gap: var(--s-s);
    padding: var(--s-xl) var(--s-m);
    border-radius: var(--r-card);
    background: var(--secondary);
    text-align: center;
}

.practice-card.is-entering {
    animation: card-in 0.5s var(--ease-spring);
}

.practice-card.is-shaking {
    animation: shake 0.45s;
}

.practice-card.is-popping {
    animation: pop 0.45s var(--ease-spring);
}

@keyframes card-in {
    from {
        opacity: 0;
        transform: translateX(40px) rotate(4deg);
    }
}

@keyframes shake {
    20%,
    60% {
        transform: translateX(-8px);
    }
    40%,
    80% {
        transform: translateX(8px);
    }
}

@keyframes pop {
    50% {
        transform: scale(1.05);
    }
}

.practice-lang {
    padding: var(--s-xs) 12px;
    border-radius: var(--r-full);
    background: var(--background-secondary);
    font-size: 14px;
    font-weight: 700;
}

.practice-word {
    display: flex;
    align-items: center;
    gap: var(--s-s);
}

.practice-word p {
    font-size: 34px;
    font-weight: 800;
    line-height: 1.2;
}

.speak {
    display: grid;
    place-items: center;
    width: 40px;
    height: 40px;
    border-radius: var(--r-full);
    color: var(--text-primary);
    background: var(--background-secondary);
    transition: transform 0.25s var(--ease-spring);
}

.speak:hover {
    transform: scale(1.1);
}

.speak svg,
.speak-big svg {
    width: 22px;
    height: 22px;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.speak svg path:first-child,
.speak-big svg path:first-child {
    fill: currentColor;
}

.practice-form {
    display: flex;
    gap: var(--s-s);
}

.practice-form input {
    flex: 1;
    min-width: 0;
    min-height: 52px;
    padding: 0 var(--s-m);
    border-radius: var(--r-double);
    border: 2px solid transparent;
    background: var(--background-primary);
    font-size: 17px;
    font-weight: 600;
    transition: border-color 0.2s;
}

.practice-form input:focus {
    outline: none;
    border-color: var(--primary);
}

.practice-skip {
    justify-self: center;
    padding: var(--s-xs) var(--s-s);
    color: var(--text-primary);
    font-weight: 700;
}

.practice-result {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--s-m);
    padding: var(--s-m);
    border-radius: var(--r-card);
    background: color-mix(in srgb, var(--state) 18%, var(--background-secondary));
    animation: rise-in 0.35s var(--ease-spring);
}

.practice-result[data-state="correct"] {
    --state: var(--success);
}

.practice-result[data-state="almost"] {
    --state: var(--warning);
}

.practice-result[data-state="wrong"] {
    --state: var(--error);
}

.practice-result[data-state="skipped"] {
    --state: var(--gray40);
}

.practice-result[hidden],
.practice-done[hidden] {
    display: none;
}

.result-title {
    font-size: 20px;
    font-weight: 800;
    color: color-mix(in srgb, var(--state) 70%, var(--text));
}

.result-detail {
    font-size: 15px;
}

@keyframes rise-in {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
}

.practice-done {
    position: absolute;
    inset: 0;
    display: grid;
    place-content: center;
    justify-items: center;
    gap: var(--s-s);
    padding: var(--s-l);
    border-radius: inherit;
    background: var(--background-secondary);
    text-align: center;
    animation: rise-in 0.4s var(--ease-spring);
}

.done-emoji {
    font-size: 56px;
    line-height: 1;
    animation: pop 0.6s 0.1s var(--ease-spring);
}

.practice-done .button {
    margin-top: var(--s-s);
}

.confetti {
    position: absolute;
    width: 10px;
    height: 14px;
    border-radius: 3px;
    pointer-events: none;
    animation: confetti 1.1s var(--ease-out) forwards;
}

@keyframes confetti {
    to {
        transform: translate(var(--dx), var(--dy)) rotate(var(--r));
        opacity: 0;
    }
}

/* ---- Languages marquee ---- */

.languages {
    padding: var(--s-l) 0;
    overflow: hidden;
    -webkit-mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
    mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
}

.marquee ul {
    display: flex;
    gap: var(--s-m);
    width: max-content;
    list-style: none;
    animation: marquee 50s linear infinite;
}

.marquee:hover ul {
    animation-play-state: paused;
}

.marquee li {
    padding: 12px 24px;
    border-radius: var(--r-full);
    font-size: 26px;
    font-weight: 800;
    white-space: nowrap;
    background: var(--c2);
    color: var(--c1);
    transition: transform 0.25s var(--ease-spring);
}

.marquee li:hover {
    transform: scale(1.08) rotate(-2deg);
}

.marquee li:nth-child(7n + 1) {
    --c1: var(--theme-purple-primary);
    --c2: var(--theme-purple-secondary);
}

.marquee li:nth-child(7n + 2) {
    --c1: var(--theme-orange-primary);
    --c2: var(--theme-orange-secondary);
}

.marquee li:nth-child(7n + 3) {
    --c1: var(--theme-blue-primary);
    --c2: var(--theme-blue-secondary);
}

.marquee li:nth-child(7n + 4) {
    --c1: var(--theme-green-primary);
    --c2: var(--theme-green-secondary);
}

.marquee li:nth-child(7n + 5) {
    --c1: var(--theme-pink-primary);
    --c2: var(--theme-pink-secondary);
}

.marquee li:nth-child(7n + 6) {
    --c1: var(--theme-yellow-primary);
    --c2: var(--theme-yellow-secondary);
}

.marquee li:nth-child(7n + 7) {
    --c1: var(--theme-red-primary);
    --c2: var(--theme-red-secondary);
}

@media (prefers-color-scheme: dark) {
    .marquee li {
        background: color-mix(in srgb, var(--c1) 28%, var(--background-secondary));
        color: var(--c2);
    }
}

@keyframes marquee {
    to {
        transform: translateX(calc(-50% - var(--s-m) / 2));
    }
}

/* ---- How it works ---- */

.how {
    padding: 112px 0 40px;
}

.step {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 64px;
    margin-bottom: 120px;
}

.step.is-flipped .step-copy {
    order: 2;
}

.step-copy {
    display: grid;
    gap: var(--s-m);
    max-width: 460px;
}

.step-copy p:not(.t-caption) {
    opacity: 0.85;
}

.step-number {
    display: grid;
    place-items: center;
    width: 48px;
    height: 48px;
    border-radius: var(--r-double);
    background: var(--primary);
    color: var(--text-contrast);
    font-size: 22px;
    font-weight: 800;
    box-shadow: var(--shadow-primary);
}

/* Sets: SetGridRow, in the seven theme colours */

.sets {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--s-m);
}

.set {
    --c1: var(--theme-purple-primary);
    --c2: var(--theme-purple-secondary);
    display: grid;
    align-content: end;
    gap: var(--s-xs);
    aspect-ratio: 1;
    padding: var(--s-m);
    border-radius: var(--r-card);
    background: var(--c2);
    color: var(--gray100);
    text-align: left;
    transition:
        transform 0.35s var(--ease-spring),
        background-color 0.35s,
        box-shadow 0.35s;
}

html:not(.no-js) .set[data-rise].is-in:hover {
    transform: translateY(-4px) rotate(-2deg);
    box-shadow: var(--shadow-card);
}

.set.is-bumped {
    animation: pop 0.4s var(--ease-spring);
}

.set-name {
    font-weight: 800;
    line-height: 1.2;
}

.set-count {
    font-size: 13px;
    font-weight: 600;
    opacity: 0.7;
}

.set-progress {
    height: 6px;
    margin-top: var(--s-xs);
    border-radius: var(--r-full);
    background: rgb(255 255 255 / 0.6);
    overflow: hidden;
}

.set-progress span {
    display: block;
    height: 100%;
    width: calc(var(--p) * 100%);
    border-radius: inherit;
    background: var(--c1);
    transition: background-color 0.35s;
}

.set[data-color="yellow"] {
    --c1: var(--theme-yellow-primary);
    --c2: var(--theme-yellow-secondary);
}

.set[data-color="orange"] {
    --c1: var(--theme-orange-primary);
    --c2: var(--theme-orange-secondary);
}

.set[data-color="red"] {
    --c1: var(--theme-red-primary);
    --c2: var(--theme-red-secondary);
}

.set[data-color="pink"] {
    --c1: var(--theme-pink-primary);
    --c2: var(--theme-pink-secondary);
}

.set[data-color="purple"] {
    --c1: var(--theme-purple-primary);
    --c2: var(--theme-purple-secondary);
}

.set[data-color="blue"] {
    --c1: var(--theme-blue-primary);
    --c2: var(--theme-blue-secondary);
}

.set[data-color="green"] {
    --c1: var(--theme-green-primary);
    --c2: var(--theme-green-secondary);
}

/* Exercises */

.exercises {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--s-m);
    align-items: stretch;
}

.flip {
    perspective: 1000px;
    min-height: 260px;
    border-radius: var(--r-card);
}

.flip-inner {
    position: relative;
    display: block;
    height: 100%;
    transform-style: preserve-3d;
    transition: transform 0.7s var(--ease-spring);
}

.flip[aria-pressed="true"] .flip-inner {
    transform: rotateY(180deg);
}

.flip-face {
    position: absolute;
    inset: 0;
    display: grid;
    place-content: center;
    gap: var(--s-s);
    padding: var(--s-m);
    border-radius: var(--r-card);
    background: var(--background-secondary);
    box-shadow: var(--shadow-soft);
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    text-align: center;
}

.flip-face strong {
    font-size: 24px;
    font-weight: 800;
    line-height: 1.2;
}

.flip-face.is-back {
    transform: rotateY(180deg);
    background: var(--primary);
    color: var(--text-contrast);
}

.flip-face.is-back .t-caption {
    color: inherit;
    opacity: 0.8;
}

.flip:hover .flip-inner {
    transform: rotateY(-8deg);
}

.flip[aria-pressed="true"]:hover .flip-inner {
    transform: rotateY(172deg);
}

.choose {
    display: grid;
    gap: var(--s-s);
    align-content: center;
    padding: var(--s-m);
    border-radius: var(--r-card);
    background: var(--background-secondary);
    box-shadow: var(--shadow-soft);
    text-align: center;
}

.choose-word {
    font-size: 24px;
    font-weight: 800;
    margin-bottom: var(--s-xs);
}

.choose-options {
    display: grid;
    gap: var(--s-s);
}

.choose-options button {
    min-height: 40px;
    padding: var(--s-xs) var(--s-s);
    border-radius: 12px;
    background: var(--background-primary);
    border: 2px solid transparent;
    font-size: 15px;
    font-weight: 700;
    transition:
        transform 0.25s var(--ease-spring),
        background-color 0.2s,
        border-color 0.2s;
}

.choose-options button:hover:not(:disabled) {
    border-color: var(--secondary);
}

.choose-options button:disabled {
    cursor: default;
}

.choose-options .is-correct {
    background: color-mix(in srgb, var(--success) 25%, var(--background-secondary));
    border-color: var(--success);
    animation: pop 0.4s var(--ease-spring);
}

.choose-options .is-wrong {
    background: color-mix(in srgb, var(--error) 18%, var(--background-secondary));
    border-color: var(--error);
    animation: shake 0.4s;
}

/* Spaced repetition curve, drawn when it rises into view */

.curve {
    padding: var(--s-l);
    border-radius: var(--r-panel);
    background: var(--background-secondary);
    box-shadow: var(--shadow-soft);
}

.curve svg {
    width: 100%;
    height: auto;
    overflow: visible;
}

.curve figcaption {
    margin-top: var(--s-s);
    text-align: center;
}

.curve-axis {
    stroke: var(--divider);
    stroke-width: 2;
}

.curve-fade {
    fill: none;
    stroke: var(--gray40);
    stroke-width: 2;
    stroke-dasharray: 4 6;
    opacity: 0;
    transition: opacity 0.8s 1.6s;
}

.curve-line {
    fill: none;
    stroke: var(--primary);
    stroke-width: 5;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-dasharray: 1;
    stroke-dashoffset: 1;
    transition: stroke-dashoffset 2.2s var(--ease-out) 0.2s;
}

.curve-dots circle {
    fill: var(--background-secondary);
    stroke: var(--primary);
    stroke-width: 4;
    transform-box: fill-box;
    transform-origin: center;
    transform: scale(0);
    transition: transform 0.4s var(--ease-spring);
}

.curve-dots circle:nth-child(1) {
    transition-delay: 0.2s;
}

.curve-dots circle:nth-child(2) {
    transition-delay: 0.55s;
}

.curve-dots circle:nth-child(3) {
    transition-delay: 1s;
}

.curve-dots circle:nth-child(4) {
    transition-delay: 1.5s;
}

.curve-labels text {
    fill: var(--muted);
    font-family: var(--font);
    font-size: 14px;
    font-weight: 700;
    text-anchor: middle;
}

.curve.is-in .curve-line,
.no-js .curve-line {
    stroke-dashoffset: 0;
}

.curve.is-in .curve-dots circle,
.no-js .curve-dots circle {
    transform: scale(1);
}

.curve.is-in .curve-fade,
.no-js .curve-fade {
    opacity: 1;
}

/* ---- Features bento ---- */

.features {
    padding: 80px 0 40px;
}

.bento {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--s-m);
}

.tile {
    display: grid;
    align-content: start;
    gap: var(--s-s);
    padding: 28px;
    border-radius: var(--r-panel);
    background: var(--background-secondary);
    box-shadow: var(--shadow-soft);
    overflow: hidden;
}

.tile > p,
.tile > div > p {
    opacity: 0.85;
}

.tile-streak {
    grid-column: span 2;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: var(--s-l);
}

.tile-streak > div:first-child {
    display: grid;
    gap: var(--s-s);
}

.streak {
    display: grid;
    gap: var(--s-s);
}

.streak-count {
    font-size: 22px;
    font-weight: 800;
    font-variant-numeric: tabular-nums;
}

.streak-count strong {
    color: var(--theme-orange-primary);
}

.streak-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 6px;
}

.streak-grid span {
    aspect-ratio: 1;
    border-radius: 8px;
    background: var(--background-primary);
    transition:
        background-color 0.3s,
        transform 0.35s var(--ease-spring);
}

.streak-grid span.is-on {
    background: var(--theme-orange-primary);
    transform: scale(1.06);
}

.streak-grid span.is-today {
    box-shadow: inset 0 0 0 3px var(--theme-orange-secondary);
}

.tile-speak {
    justify-items: start;
    background: color-mix(in srgb, var(--theme-blue-secondary) 45%, var(--background-secondary));
}

.speak-big {
    position: relative;
    display: grid;
    place-items: center;
    width: 72px;
    height: 72px;
    margin-top: var(--s-s);
    border-radius: var(--r-full);
    background: var(--theme-blue-primary);
    color: #fff;
    transition: transform 0.25s var(--ease-spring);
}

.speak-big svg {
    width: 30px;
    height: 30px;
}

.speak-big:hover {
    transform: scale(1.08);
}

.speak-big:active {
    transform: scale(0.94);
}

.speak-big.is-speaking::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    border: 3px solid var(--theme-blue-primary);
    animation: ring 1s ease-out infinite;
}

@keyframes ring {
    to {
        transform: scale(1.6);
        opacity: 0;
    }
}

.speak-word {
    font-size: 22px;
    font-weight: 800;
    min-height: 1.4em;
}

.speak-word span {
    display: inline-block;
    animation: rise-in 0.35s var(--ease-spring);
}

.tile-remind {
    background: color-mix(in srgb, var(--theme-yellow-secondary) 55%, var(--background-secondary));
}

.notification {
    display: flex;
    gap: 12px;
    margin-top: var(--s-s);
    padding: 12px;
    border-radius: 20px;
    background: var(--background-secondary);
    box-shadow: var(--shadow-soft);
    font-size: 14px;
    line-height: 1.35;
    transform: translateY(24px) scale(0.96);
    opacity: 0;
    transition:
        transform 0.6s var(--ease-spring) 0.5s,
        opacity 0.4s 0.5s;
}

.tile.is-in .notification,
.no-js .notification {
    transform: none;
    opacity: 1;
}

.notification img {
    flex: none;
    width: 36px;
    height: 36px;
    border-radius: 9px;
    box-shadow: 0 0 0 1px var(--divider);
}

.notification-head {
    display: flex;
    justify-content: space-between;
    gap: var(--s-s);
}

.notification-head span {
    color: var(--muted);
}

.tile-languages {
    background: var(--primary);
    color: var(--text-contrast);
}

.tile-languages > p {
    opacity: 0.9;
}

.big-number {
    font-size: 88px;
    font-weight: 800;
    line-height: 0.9;
    letter-spacing: -0.04em;
}

.tile-sync {
    background: color-mix(in srgb, var(--theme-green-secondary) 45%, var(--background-secondary));
}

.tile-private {
    grid-column: 1 / -1;
    grid-template-columns: auto 1fr;
    align-items: center;
    column-gap: var(--s-l);
    background: color-mix(in srgb, var(--theme-pink-secondary) 45%, var(--background-secondary));
}

@media (prefers-color-scheme: dark) {
    .tile-speak,
    .tile-remind,
    .tile-sync,
    .tile-private {
        background: var(--background-secondary);
    }
}

/* ---- Call to action ---- */

.cta {
    padding-top: 80px;
}

.cta-panel {
    position: relative;
    display: grid;
    justify-items: center;
    gap: var(--s-m);
    padding: 72px var(--s-l);
    border-radius: var(--r-panel);
    background:
        radial-gradient(circle at 15% 0%, rgb(255 255 255 / 0.18), transparent 40%),
        linear-gradient(135deg, #8f61f0, var(--primary) 55%, #5a2bc4);
    color: var(--text-contrast);
    text-align: center;
    overflow: hidden;
}

.cta-panel .t-body0 {
    max-width: 34ch;
    opacity: 0.9;
}

.cta-bolt {
    height: 96px;
    width: auto;
    filter: drop-shadow(0 12px 24px rgb(0 0 0 / 0.25)) brightness(1.6) saturate(0.4);
    animation: bob 5s ease-in-out infinite;
}

.cta .store-badge {
    margin-top: var(--s-s);
}

.cta .store-badge img {
    border-radius: 10px;
    box-shadow: 0 0 0 1px rgb(255 255 255 / 0.4);
}

/* ---- Small screens ---- */

@media (max-width: 900px) {
    .hero-grid,
    .step {
        grid-template-columns: 1fr;
        gap: var(--s-xxl);
    }

    .step.is-flipped .step-copy {
        order: 0;
    }

    .hero {
        padding-top: var(--s-l);
    }

    .bento {
        grid-template-columns: 1fr 1fr;
    }

    .step {
        margin-bottom: 88px;
    }
}

@media (max-width: 600px) {
    .sets {
        grid-template-columns: repeat(2, 1fr);
    }

    .exercises,
    .bento,
    .tile-streak {
        grid-template-columns: 1fr;
    }

    .tile-streak {
        grid-column: auto;
    }

    .tile-private {
        grid-template-columns: 1fr;
    }

    .chip {
        font-size: 13px;
    }

    .practice {
        padding: var(--s-m);
    }

    .practice-word p {
        font-size: 28px;
    }
}