:root {
    --registration-navy: #102d4f;
    --registration-blue: #146da8;
    --registration-sky: #eaf4fa;
    --registration-red: #b3262e;
    --registration-ink: #1b2a38;
    --registration-muted: #607080;
    --registration-line: #d4e0e8;
}

body.registration-page {
    margin: 0;
    min-height: 100vh;
    color: var(--registration-ink);
    background: linear-gradient(180deg, #e9f3f9 0, #f7fafc 380px);
    font-family: Arial, Helvetica, sans-serif;
}

.registration-header {
    padding: 42px 20px 96px;
    color: #fff;
    background: linear-gradient(120deg, rgba(8, 35, 63, .98), rgba(20, 109, 168, .92));
}

.registration-header-inner,
.registration-main {
    width: min(900px, calc(100% - 40px));
    margin: 0 auto;
}

.back-link {
    display: inline-block;
    margin-bottom: 34px;
    color: #dceef8;
    text-decoration: none;
    font-weight: 700;
}

.back-link:hover,
.back-link:focus { text-decoration: underline; }

.event-label {
    margin: 0 0 8px;
    color: #bde4f8;
    font-size: .86rem;
    font-weight: 700;
    letter-spacing: .09em;
    text-transform: uppercase;
}

.registration-header h1 {
    margin: 0 0 12px;
    font-family: Georgia, 'Times New Roman', serif;
    font-size: clamp(2.1rem, 6vw, 3.7rem);
    font-weight: 500;
}

.registration-header p:last-child { margin: 0; font-size: 1.08rem; }

.registration-main { margin-top: -58px; padding-bottom: 70px; }

.registration-card {
    overflow: hidden;
    border: 1px solid rgba(16, 45, 79, .12);
    border-radius: 14px;
    background: #fff;
    box-shadow: 0 20px 55px rgba(16, 45, 79, .14);
}

.form-intro { padding: 32px 38px 25px; border-bottom: 1px solid var(--registration-line); }
.form-intro h2 { margin: 0 0 8px; color: var(--registration-navy); font-size: 1.55rem; }
.form-intro p { margin: 0; color: var(--registration-muted); }
.required { color: var(--registration-red); }

.registration-form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px 28px;
    padding: 34px 38px 40px;
}

.field { min-width: 0; }
.full-width { grid-column: 1 / -1; }
.field > label,
.field legend {
    display: block;
    margin-bottom: 9px;
    color: var(--registration-navy);
    font-weight: 700;
}

.field input[type='text'],
.field input[type='email'],
.field select {
    box-sizing: border-box;
    width: 100%;
    min-height: 46px;
    padding: 10px 12px;
    border: 1px solid #aebfcc;
    border-radius: 6px;
    background: #fff;
    color: var(--registration-ink);
    font: inherit;
}

.field input:focus,
.field select:focus {
    border-color: var(--registration-blue);
    outline: 3px solid rgba(20, 109, 168, .15);
}

.choice-group {
    margin: 0;
    padding: 18px 20px;
    border: 1px solid var(--registration-line);
    border-radius: 8px;
    background: var(--registration-sky);
}
.choice-group label { display: inline-flex; gap: 8px; align-items: center; margin: 6px 28px 0 0; }
.consent-field { padding-top: 4px; }
.consent-field label { display: flex; gap: 10px; align-items: flex-start; font-weight: 400; line-height: 1.45; }
.consent-field input { margin-top: 4px; }

.registration-submit {
    min-height: 48px;
    padding: 12px 24px;
    border: 0;
    border-radius: 6px;
    color: #fff;
    background: var(--registration-blue);
    font: inherit;
    font-weight: 700;
    cursor: pointer;
}
.registration-submit:hover,
.registration-submit:focus { background: var(--registration-navy); }
.registration-submit:disabled { opacity: .65; cursor: wait; }
.form-status { min-height: 1.4em; margin: 10px 0 0; color: var(--registration-muted); }
.bot-field { position: absolute !important; left: -10000px !important; width: 1px; height: 1px; overflow: hidden; }

.registration-message {
    padding: 38px;
    text-align: center;
}
.registration-message h2 { color: var(--registration-navy); }
.registration-id { font-size: 1.35rem; font-weight: 700; color: var(--registration-blue); }
.registration-error-list { max-width: 650px; margin: 20px auto; color: var(--registration-red); text-align: left; }

@media (max-width: 650px) {
    .registration-header { padding: 28px 0 88px; }
    .registration-form { grid-template-columns: 1fr; padding: 26px 20px 32px; }
    .form-intro { padding: 26px 20px 20px; }
    .field, .full-width { grid-column: 1; }
}

.conference-name {
    max-width: 760px;
    margin: 0 0 18px;
    color: #ffffff;
    font-family: Georgia, "Times New Roman", serif;
    font-size: clamp(1.35rem, 3vw, 2rem);
    line-height: 1.25;
}