:root {
    --bg: #f6f7f1;
    --green: #1f3a27;
    --gold: #a9874a;
    --text: #1d241f;
    --muted: #4b524d;
    --error: #b3412f;
    /* 1 unit = 1px of the 768px-wide mockup */
    --w: min(100vw, 960px);
    --u: calc(var(--w) / 768);
}

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

html,
body {
    background: var(--bg);
    color: var(--text);
    font-family: "Montserrat", system-ui, sans-serif;
}

body {
    overflow-x: hidden;
}

img {
    display: block;
    max-width: none;
    user-select: none;
    -webkit-user-drag: none;
}

[hidden] {
    display: none !important;
}

/* ---------- stage: repeats the mockup proportions ---------- */

.stage {
    position: relative;
    width: var(--w);
    height: calc(var(--u) * 1376);
    margin: 0 auto;
    overflow: hidden;
}

.logo {
    display: block;
    position: absolute;
    z-index: 3;
    left: calc(var(--u) * 68);
    top: calc(var(--u) * 30);
    width: calc(var(--u) * 125);
}

.logo img {
    width: 100%;
    height: auto;
}

.content {
    position: absolute;
    z-index: 3;
    left: calc(var(--u) * 68);
    top: calc(var(--u) * 188);
    width: calc(var(--u) * 440);
}

h1 {
    font-family: "Forum", serif;
    font-weight: 400;
    color: var(--green);
    font-size: calc(var(--u) * 48);
    line-height: 1.08;
    text-transform: uppercase;
    letter-spacing: .01em;
}

.lead {
    margin-top: calc(var(--u) * 14);
    max-width: calc(var(--u) * 340);
    font-size: calc(var(--u) * 19);
    font-weight: 500;
    line-height: 1.35;
}

.tabs {
    display: inline-flex;
    margin-top: calc(var(--u) * 24);
    padding: 3px;
    border: 1.5px solid var(--gold);
    border-radius: 999px;
    background: rgba(255, 255, 255, .6);
}

.tabs button {
    padding: calc(var(--u) * 12) calc(var(--u) * 18);
    border: 0;
    border-radius: 999px;
    background: transparent;
    color: var(--green);
    font-family: "Montserrat", sans-serif;
    font-size: calc(var(--u) * 14.5);
    font-weight: 600;
    text-transform: uppercase;
    cursor: pointer;
    transition: background .25s, color .25s;
}

.tabs button.active {
    background: linear-gradient(90deg, #173021, #2e5338);
    color: #fff;
}

.tabs button:focus-visible {
    outline: 2px solid var(--gold);
    outline-offset: 2px;
}

form {
    width: calc(var(--u) * 352);
    margin-top: calc(var(--u) * 24);
}

label {
    display: block;
    margin-bottom: calc(var(--u) * 10);
    font-size: calc(var(--u) * 17);
    font-weight: 500;
}

.field {
    margin-bottom: calc(var(--u) * 20);
}

input {
    width: 100%;
    height: calc(var(--u) * 52);
    padding: 0 calc(var(--u) * 16);
    border: 1.5px solid var(--green);
    border-radius: 10px;
    background: #fff;
    color: var(--text);
    font-family: "Montserrat", sans-serif;
    font-size: calc(var(--u) * 17);
    outline: none;
    transition: box-shadow .2s;
}

input::placeholder {
    color: #8a8f8b;
}

input:focus {
    box-shadow: 0 0 0 3px rgba(169, 135, 74, .3);
}

input.error {
    border-color: var(--error);
}

.hp {
    position: absolute;
    left: -9999px;
    width: 1px;
    height: 1px;
    opacity: 0;
}

.submit {
    width: 100%;
    height: calc(var(--u) * 54);
    margin-top: calc(var(--u) * 14);
    border: 0;
    border-radius: 8px;
    background: linear-gradient(180deg, #b8955a, #9c7b40);
    color: #fff;
    font-family: "Montserrat", sans-serif;
    font-size: calc(var(--u) * 17);
    font-weight: 500;
    letter-spacing: .03em;
    text-transform: uppercase;
    cursor: pointer;
    transition: filter .2s, transform .1s;
}

.submit:hover {
    filter: brightness(1.06);
}

.submit:active {
    transform: translateY(1px);
}

.submit:disabled {
    cursor: progress;
    opacity: .7;
}

.form-error {
    margin-top: calc(var(--u) * 12);
    color: var(--error);
    font-size: calc(var(--u) * 14);
    text-align: center;
}

.policy {
    margin-top: calc(var(--u) * 14);
    color: var(--muted);
    font-size: calc(var(--u) * 13);
    line-height: 1.4;
    text-align: center;
}

.policy a {
    color: inherit;
}

.thanks {
    width: calc(var(--u) * 352);
    margin-top: 24px;
    padding: 20px;
    border: 1.5px solid var(--gold);
    border-radius: 12px;
    background: #fff;
    color: var(--green);
    font-size: calc(var(--u) * 16);
    line-height: 1.45;
}

/* ---------- illustrations ---------- */

.art {
    position: absolute;
    z-index: 1;
    height: auto;
    pointer-events: none;
}

/* scene with birches */
.art-a {
    left: calc(var(--u) * 432);
    top: calc(var(--u) * -6);
    width: calc(var(--u) * 378);
}

/* sun half-circle */
.art-b {
    z-index: 2;
    right: 0;
    top: calc(var(--u) * 478);
    width: calc(var(--u) * 214);
}

/* big village circle */
.art-c {
    left: calc(var(--u) * 330);
    top: calc(var(--u) * 786);
    width: calc(var(--u) * 436);
}

/* house with birches */
.art-d {
    left: 0;
    bottom: 0;
    width: calc(var(--u) * 270);
}

@media (min-width: 641px) {
    .art-wrap {
        display: contents;
    }
}

/* ---------- phones: form on top, illustrations below ---------- */

@media (max-width: 640px) {
    :root {
        --u: 1px;
    }

    .stage {
        width: 100%;
        height: auto;
        padding: 24px 20px 0;
    }

    .logo {
        position: static;
        width: 110px;
    }

    .content {
        position: static;
        width: 100%;
        margin-top: 22px;
    }

    h1 {
        font-size: clamp(28px, 9vw, 42px);
    }

    .lead {
        font-size: 17px;
    }

    .tabs {
        display: flex;
        width: 100%;
    }

    .tabs button {
        flex: 1;
        padding: 12px 6px;
        font-size: 12.5px;
    }

    form,
    .thanks {
        width: 100%;
    }

    label,
    input,
    .submit {
        font-size: 16px;
    }

    .art-wrap {
        position: relative;
        height: calc(100vw * 1.25);
        margin: 28px -20px 0;
    }

    .art-a {
        left: auto;
        right: -6vw;
        top: 0;
        width: 72vw;
    }

    .art-b,
    .art-c {
        display: none;
    }

    .art-d {
        left: 0;
        bottom: 0;
        width: 47vw;
    }
}