:root {
    --background: #f5f6f8;
    --surface: #ffffff;
    --border: #dfe2e7;
    --text: #1d232b;
    --text-muted: #5b6470;
    --text-subtle: #7b8390;
    --accent: #4a72b5;
    --accent-hover: #3b5f9e;
    --accent-contrast: #ffffff;
    --segment-background: #eef0f3;
    --segment-active: #1d232b;
    --segment-active-text: #ffffff;
    --focus: #4a72b5;
    --error: #b42318;
    --shadow: 0 1px 2px rgba(16, 24, 40, 0.06), 0 8px 24px rgba(16, 24, 40, 0.06);
    color-scheme: light;
}

@media (prefers-color-scheme: dark) {
    :root {
        --background: #111418;
        --surface: #1a1f25;
        --border: #2d343d;
        --text: #e9ecef;
        --text-muted: #a8b0ba;
        --text-subtle: #8a929c;
        --accent: #8fb0e8;
        --accent-hover: #a9c1ec;
        --accent-contrast: #16191d;
        --segment-background: #242a31;
        --segment-active: #e9ecef;
        --segment-active-text: #16191d;
        --focus: #a9c1ec;
        --error: #f97066;
        --shadow: none;
        color-scheme: dark;
    }
}

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

html {
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    background-color: var(--background);
    color: var(--text);
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
    font-size: 16px;
    line-height: 1.5;
}

a {
    color: var(--accent);
}

.page {
    max-width: 640px;
    margin: 0 auto;
    padding: 40px 16px;
}

.card {
    padding: 32px 32px 24px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background-color: var(--surface);
    box-shadow: var(--shadow);
}

h1 {
    margin: 0 0 8px;
    font-size: 26px;
    line-height: 1.25;
    text-align: center;
    text-wrap: balance;
}

.lead {
    margin: 0 0 24px;
    color: var(--text-muted);
    text-align: center;
    text-wrap: balance;
}

.chat-form {
    margin: 0;
}

.messenger-switcher {
    min-width: 0;
    margin: 0 0 18px;
    padding: 0;
    border: 0;
}

.field-label {
    display: block;
    margin-bottom: 8px;
    padding: 0;
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 600;
}

.segmented {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 4px;
    padding: 4px;
    border-radius: 12px;
    background-color: var(--segment-background);
}

.segment {
    position: relative;
    display: block;
}

.segment input {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    margin: 0;
    opacity: 0;
    cursor: pointer;
}

.segment span {
    display: block;
    padding: 9px 4px;
    border-radius: 9px;
    color: var(--text-muted);
    font-size: 15px;
    font-weight: 600;
    text-align: center;
    transition: background-color 0.15s ease, color 0.15s ease;
}

.segment input:hover + span {
    color: var(--text);
}

.segment input:checked + span {
    background-color: var(--segment-active);
    color: var(--segment-active-text);
}

.segment input:focus-visible + span {
    outline: 2px solid var(--focus);
    outline-offset: 2px;
}

.phone-field {
    display: flex;
    align-items: center;
    border: 1px solid var(--border);
    border-radius: 12px;
    background-color: var(--surface);
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.phone-field:focus-within {
    border-color: var(--focus);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--focus) 22%, transparent);
}

.phone-field.is-invalid {
    border-color: var(--error);
}

.phone-prefix {
    padding: 0 2px 0 16px;
    color: var(--text-muted);
    font-size: 24px;
    font-weight: 700;
}

.phone-input {
    flex: 1;
    min-width: 0;
    padding: 12px 16px 12px 6px;
    border: 0;
    border-radius: 12px;
    background: transparent;
    color: var(--text);
    font: inherit;
    font-size: 24px;
    font-weight: 700;
    letter-spacing: 0.04em;
    font-variant-numeric: tabular-nums;
}

.phone-input::placeholder {
    color: var(--text-subtle);
    font-weight: 500;
    opacity: 0.6;
}

.phone-input:focus {
    outline: none;
}

.field-error {
    margin: 8px 0 0;
    color: var(--error);
    font-size: 14px;
}

.open-button {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    margin-top: 18px;
    padding: 14px 20px;
    border: 0;
    border-radius: 12px;
    background-color: var(--accent);
    color: var(--accent-contrast);
    cursor: pointer;
    font: inherit;
    font-size: 17px;
    font-weight: 700;
    transition: background-color 0.15s ease;
}

.open-button:hover {
    background-color: var(--accent-hover);
}

.open-button:focus-visible {
    outline: 2px solid var(--focus);
    outline-offset: 3px;
}

.open-button-icon {
    flex: 0 0 22px;
    width: 22px;
    height: 22px;
}

.hint {
    margin: 12px 0 0;
    color: var(--text-muted);
    font-size: 14px;
    text-align: center;
}

.privacy {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    margin: 20px 0 0;
    padding-top: 16px;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 13px;
    line-height: 1.45;
}

.privacy-icon {
    flex: 0 0 18px;
    width: 18px;
    height: 18px;
    margin-top: 1px;
}

.language-switcher {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 6px;
    margin: 20px auto 0;
}

.language-option {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 10px;
    border-radius: 16px;
    color: var(--text-muted);
    font-size: 13px;
    text-decoration: none;
    transition: background-color 0.15s ease, color 0.15s ease;
}

.language-option:focus-visible {
    outline: 2px solid var(--focus);
    outline-offset: 2px;
}

.language-option:hover,
.language-option[aria-current="page"] {
    background-color: var(--segment-background);
    color: var(--text);
}

.language-flag {
    position: relative;
    display: inline-block;
    flex: 0 0 20px;
    width: 20px;
    height: 14px;
    overflow: hidden;
    border: 1px solid rgba(0, 0, 0, 0.12);
    border-radius: 2px;
}

.language-flag-us {
    background: repeating-linear-gradient(to bottom, #b22234 0 7.69%, #fff 7.69% 15.38%);
}

.language-flag-us::after {
    position: absolute;
    top: 0;
    left: 0;
    width: 45%;
    height: 54%;
    background-color: #3c3b6e;
    background-image: radial-gradient(circle, #fff 0 0.5px, transparent 0.6px);
    background-size: 4px 2px;
    content: "";
}

.language-flag-ru {
    background-color: #fff;
}

.language-flag-ru::before,
.language-flag-ru::after {
    position: absolute;
    left: 0;
    width: 100%;
    height: 33.333%;
    content: "";
}

.language-flag-ru::before {
    top: 33.333%;
    background-color: #0039a6;
}

.language-flag-ru::after {
    top: 66.666%;
    background-color: #d52b1e;
}

.language-flag-es {
    background: linear-gradient(to bottom, #aa151b 0 25%, #f1bf00 25% 75%, #aa151b 75%);
}

.guide {
    margin: 36px 0 0;
    color: var(--text-muted);
    font-size: 15px;
    line-height: 1.6;
}

.guide h2 {
    margin: 0 0 12px;
    color: var(--text);
    font-size: 20px;
    line-height: 1.3;
    text-align: center;
    text-wrap: balance;
}

.guide-steps {
    margin: 0;
    padding-left: 24px;
}

.guide-steps li {
    margin: 6px 0;
}

.guide-note {
    margin: 12px 0 0;
    color: var(--text-subtle);
    font-size: 14px;
    text-align: center;
}

.disclaimer {
    margin-top: 32px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
    color: var(--text-subtle);
    font-size: 12px;
    line-height: 1.5;
    text-align: center;
}

.disclaimer p {
    margin: 0;
}

@media (max-width: 420px) {
    .page {
        padding-top: 20px;
    }

    .card {
        padding: 22px 16px 18px;
    }

    h1 {
        font-size: 22px;
    }

    .segment span {
        font-size: 14px;
    }

    .phone-input,
    .phone-prefix {
        font-size: 21px;
    }
}