:root {
    color-scheme: light;
    --ink: #172026;
    --muted: #52616b;
    --line: #d9e1e7;
    --accent: #0f766e;
    --accent-dark: #115e59;
    --surface: #ffffff;
    --backdrop: #f4f7f8;
    --warning: #b42318;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: Arial, Helvetica, sans-serif;
    color: var(--ink);
    background:
        linear-gradient(90deg, rgba(244, 247, 248, 0.96) 0%, rgba(244, 247, 248, 0.86) 46%, rgba(244, 247, 248, 0.64) 100%),
        url("./event-hero.2d7a69ed66c7.png") center / cover no-repeat,
        var(--backdrop);
}

.page-shell {
    width: min(1100px, calc(100% - 32px));
    min-height: 100vh;
    margin: 0 auto;
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(320px, 460px);
    gap: 56px;
    align-items: center;
    padding: 48px 0;
}

.intro h1 {
    max-width: 720px;
    margin: 0;
    font-size: clamp(2.2rem, 5vw, 4.8rem);
    line-height: 1;
    letter-spacing: 0;
}

.eyebrow {
    margin: 0 0 16px;
    color: var(--accent-dark);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.summary {
    max-width: 560px;
    margin: 24px 0 0;
    color: var(--muted);
    font-size: 1.15rem;
    line-height: 1.6;
}

.registration-panel {
    width: 100%;
    padding: 28px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--surface);
    box-shadow: 0 18px 42px rgba(23, 32, 38, 0.08);
}

.registration-panel h2 {
    margin: 0 0 24px;
    font-size: 1.35rem;
}

.field {
    margin-bottom: 18px;
}

label {
    display: block;
    margin-bottom: 8px;
    color: var(--ink);
    font-size: 0.92rem;
    font-weight: 700;
}

input[type="text"],
input[type="email"] {
    width: 100%;
    height: 44px;
    border: 1px solid var(--line);
    border-radius: 6px;
    padding: 0 12px;
    color: var(--ink);
    font: inherit;
    background: #fff;
}

input:focus {
    border-color: var(--accent);
    outline: 3px solid rgba(15, 118, 110, 0.16);
}

.checkbox-field {
    display: flex;
    gap: 10px;
    align-items: center;
}

.checkbox-field label {
    margin: 0;
    font-weight: 600;
}

.checkbox-field input {
    width: 18px;
    height: 18px;
    order: -1;
    accent-color: var(--accent);
}

button {
    width: 100%;
    min-height: 46px;
    border: 0;
    border-radius: 6px;
    color: #fff;
    font: inherit;
    font-weight: 700;
    background: var(--accent);
    cursor: pointer;
}

button:hover,
button:focus {
    background: var(--accent-dark);
}

.message {
    margin: 0 0 18px;
    border-radius: 6px;
    padding: 12px;
    background: #e7f6f2;
    color: #115e59;
}

.error {
    margin: 8px 0 0;
    color: var(--warning);
    font-size: 0.88rem;
}

@media (max-width: 780px) {
    body {
        background:
            linear-gradient(180deg, rgba(244, 247, 248, 0.92) 0%, rgba(244, 247, 248, 0.98) 42%),
            url("./event-hero.2d7a69ed66c7.png") center top / auto 42vh no-repeat,
            var(--backdrop);
    }

    .page-shell {
        grid-template-columns: 1fr;
        gap: 28px;
        align-items: start;
    }

    .intro h1 {
        font-size: 2.35rem;
    }
}