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

:root {
    --color-primary: #1a5e1f;
    --color-primary-light: #e8f5e9;
    --color-error: #c62828;
    --color-error-bg: #ffebee;
    --color-text: #1a1a1a;
    --color-text-muted: #555;
    --color-border: #ccc;
    --color-bg: #f8f9fa;
    --radius: 6px;
}

html {
    font-family:
        -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
        Arial, sans-serif;
    font-size: 100%;
    line-height: 1.5;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-text-size-adjust: 100%;
}

body {
    min-height: 100dvh;
    padding: 0 1rem 3rem;
}

.container {
    max-width: 600px;
    margin: 0 auto;
}

/* ── Header ── */

.event-header {
    text-align: center;
    padding: 2rem 0 1.5rem;
}

.event-header .club {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
}

.event-header h1 {
    font-size: 1.75rem;
    line-height: 1.2;
    margin: 0.25rem 0;
}

.event-header .dates {
    font-size: 1.05rem;
    color: var(--color-text-muted);
}

/* ── Form ── */

form {
    background: #fff;
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: 0 1px 3px rgb(0 0 0 / 0.08);
}

.form-group {
    margin-bottom: 1.25rem;
}

label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.3rem;
}

input[type="text"],
input[type="date"],
input[type="tel"],
select,
textarea {
    display: block;
    width: 100%;
    padding: 0.65rem 0.75rem;
    font-size: 1rem;
    font-family: inherit;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: #fff;
    color: var(--color-text);
    transition: border-color 0.15s;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgb(26 94 31 / 0.15);
}

textarea {
    resize: vertical;
    min-height: 5rem;
}

.hint {
    display: block;
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-top: 0.25rem;
}

.error-message {
    display: block;
    font-size: 0.8125rem;
    color: var(--color-error);
    min-height: 1.25rem;
    margin-top: 0.2rem;
}

input.invalid,
select.invalid,
textarea.invalid {
    border-color: var(--color-error);
}

/* ── Fieldset ── */

fieldset {
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1rem 1rem 0;
    margin-bottom: 1.25rem;
}

legend {
    font-weight: 600;
    padding: 0 0.4rem;
}

/* ── Radio group ── */

.radio-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-top: 0.4rem;
}

.radio-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: background-color 0.15s;
}

.radio-option:has(input:checked) {
    background: var(--color-primary-light);
    border-color: var(--color-primary);
}

.radio-option input[type="radio"] {
    accent-color: var(--color-primary);
    width: 1.1rem;
    height: 1.1rem;
    margin: 0;
}

.radio-option span {
    font-weight: 500;
}

.explainer {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    font-style: italic;
    margin-bottom: 0.75rem;
    line-height: 1.5;
}

/* ── Submit button ── */

.btn-submit {
    display: block;
    width: 100%;
    padding: 0.8rem;
    font-size: 1.05rem;
    font-weight: 600;
    font-family: inherit;
    color: #fff;
    background: var(--color-primary);
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: background-color 0.15s;
    margin-top: 0.5rem;
}

.btn-submit:hover,
.btn-submit:focus-visible {
    background: #144d18;
}

/* ── Alert boxes (success / error from PHP) ── */

.alert {
    padding: 1.25rem;
    border-radius: var(--radius);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.alert-success {
    background: var(--color-primary-light);
    border: 1px solid var(--color-primary);
    color: var(--color-primary);
}

.alert-error {
    background: var(--color-error-bg);
    border: 1px solid var(--color-error);
    color: var(--color-error);
}

.alert h2 {
    margin-bottom: 0.5rem;
}

.alert a {
    color: inherit;
    font-weight: 600;
}

/* ── Wider screens ── */

@media (min-width: 640px) {
    .event-header h1 {
        font-size: 2rem;
    }

    .fieldset-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 0 1rem;
    }

    .btn-submit {
        width: auto;
        padding: 0.8rem 2.5rem;
        margin-left: auto;
    }
}