/* ── Variables ───────────────────────────────────────────────── */
.bti-wrap {
    --bti-bg:       #0a0e1a;
    --bti-surface:  #111827;
    --bti-border:   #1e2d45;
    --bti-accent:   #e8a020;
    --bti-accent2:  #c0392b;
    --bti-text:     #e8ecf4;
    --bti-muted:    #8a9ab5;
    --bti-success:  #27ae60;
    --bti-error:    #e74c3c;
    --bti-radius:   10px;
    --bti-shadow:   0 4px 24px rgba(0,0,0,.45);

    font-family: "Segoe UI", system-ui, sans-serif;
    max-width: 720px;
    margin: 0 auto;
    background: var(--bti-bg);
    color: var(--bti-text);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--bti-shadow);
}

/* ── Header ─────────────────────────────────────────────────── */
.bti-header {
    background: linear-gradient(135deg, #0d1b2e 0%, #1a2744 60%, #0d1b2e 100%);
    border-bottom: 3px solid var(--bti-accent);
    text-align: center;
    padding: 2.5rem 1.5rem 2rem;
    position: relative;
}
.bti-header::before {
    content: "";
    position: absolute; inset: 0;
    background: repeating-linear-gradient(
        -55deg,
        transparent, transparent 18px,
        rgba(232,160,32,.04) 18px, rgba(232,160,32,.04) 20px
    );
}
.bti-flag { font-size: 2.8rem; line-height: 1; margin-bottom: .4rem; }
.bti-title {
    font-size: clamp(1.4rem, 4vw, 2rem);
    font-weight: 800;
    letter-spacing: .04em;
    text-transform: uppercase;
    color: #fff;
    margin: 0 0 .3rem;
}
.bti-subtitle {
    color: var(--bti-accent);
    font-size: .85rem;
    text-transform: uppercase;
    letter-spacing: .12em;
    margin: 0 0 1rem;
}
.bti-meta { display: flex; gap: .6rem; justify-content: center; flex-wrap: wrap; }
.bti-badge {
    background: rgba(232,160,32,.15);
    border: 1px solid var(--bti-accent);
    color: var(--bti-accent);
    padding: .3rem .8rem;
    border-radius: 20px;
    font-size: .8rem;
    font-weight: 600;
}

/* ── Form wrap ───────────────────────────────────────────────── */
.bti-form { padding: 0; }

/* ── Sections ────────────────────────────────────────────────── */
.bti-section {
    padding: 1.8rem 2rem;
    border-bottom: 1px solid var(--bti-border);
}
.bti-section:last-child { border-bottom: none; }
.bti-section-title {
    font-size: 1rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .08em;
    color: var(--bti-accent);
    margin: 0 0 1.4rem;
    padding-bottom: .6rem;
    border-bottom: 1px solid var(--bti-border);
    display: flex; align-items: center; gap: .5rem;
}
.bti-icon { font-size: 1.1rem; }

/* ── Grids ───────────────────────────────────────────────────── */
.bti-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.bti-grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 1rem; }
@media (max-width: 540px) {
    .bti-grid-2, .bti-grid-3 { grid-template-columns: 1fr; }
    .bti-section { padding: 1.4rem 1.2rem; }
}

/* ── Fields ──────────────────────────────────────────────────── */
.bti-field { display: flex; flex-direction: column; gap: .4rem; margin-bottom: 1rem; }
.bti-field:last-child { margin-bottom: 0; }
.bti-field label {
    font-size: .78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .07em;
    color: var(--bti-muted);
}
.bti-required { color: var(--bti-accent); }
.bti-field input,
.bti-field textarea,
.bti-field select {
    background: var(--bti-surface);
    border: 1.5px solid var(--bti-border);
    border-radius: var(--bti-radius);
    color: var(--bti-text);
    padding: .65rem .9rem;
    font-size: .95rem;
    transition: border-color .2s, box-shadow .2s;
    width: 100%;
    box-sizing: border-box;
}
.bti-field input:focus,
.bti-field textarea:focus {
    outline: none;
    border-color: var(--bti-accent);
    box-shadow: 0 0 0 3px rgba(232,160,32,.18);
}
.bti-field input::placeholder,
.bti-field textarea::placeholder { color: #3a4a60; }
.bti-field textarea { resize: vertical; min-height: 80px; }

/* champs en erreur */
.bti-error-field input,
.bti-error-field textarea {
    border-color: var(--bti-error) !important;
    box-shadow: 0 0 0 3px rgba(231,76,60,.15);
}
.bti-error-field label { color: var(--bti-error); }

/* ── Alerte ──────────────────────────────────────────────────── */
.bti-alert {
    margin: 1rem 2rem;
    padding: .85rem 1.1rem;
    border-radius: var(--bti-radius);
    font-size: .9rem;
    font-weight: 600;
}
.bti-alert-error {
    background: rgba(231,76,60,.15);
    border: 1px solid var(--bti-error);
    color: #f5a5a0;
}

/* ── Paiement ────────────────────────────────────────────────── */
.bti-payment-info { color: var(--bti-muted); font-size: .9rem; margin: 0 0 1rem; }
.bti-payment-box {
    background: var(--bti-surface);
    border: 1px solid var(--bti-border);
    border-radius: var(--bti-radius);
    overflow: hidden;
    margin-bottom: 1rem;
}
.bti-amount {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.2rem;
    background: rgba(232,160,32,.08);
    border-bottom: 1px solid var(--bti-border);
}
.bti-amount-label { font-weight: 600; color: var(--bti-muted); }
.bti-amount-value { font-size: 1.5rem; font-weight: 800; color: var(--bti-accent); }
.bti-payment-details { padding: .9rem 1.2rem; font-size: .88rem; line-height: 1.8; color: var(--bti-muted); }
.bti-payment-details p { margin: 0; }
.bti-transpondeur {
    background: rgba(192,57,43,.12);
    border: 1px solid rgba(192,57,43,.4);
    color: #f5a5a0;
    padding: .75rem 1rem;
    border-radius: var(--bti-radius);
    font-size: .88rem;
}

/* ── CGV ─────────────────────────────────────────────────────── */
.bti-checkbox {
    display: flex;
    align-items: flex-start;
    gap: .8rem;
    cursor: pointer;
    margin-bottom: .8rem;
}
.bti-checkbox input[type="checkbox"] {
    width: 18px; height: 18px;
    margin-top: 2px;
    flex-shrink: 0;
    accent-color: var(--bti-accent);
    cursor: pointer;
}
.bti-checkbox-text { font-size: .95rem; line-height: 1.5; }
.bti-checkbox.bti-error-field .bti-checkbox-text { color: var(--bti-error); }
.bti-cgv-note { font-size: .82rem; color: var(--bti-muted); font-style: italic; margin: 0; }

/* ── Submit ──────────────────────────────────────────────────── */
.bti-submit-wrap {
    padding: 1.5rem 2rem 2rem;
    text-align: center;
}
.bti-btn-submit {
    display: inline-block;
    background: var(--bti-accent);
    color: #0a0e1a;
    font-weight: 800;
    font-size: 1rem;
    letter-spacing: .05em;
    text-transform: uppercase;
    padding: .9rem 2.5rem;
    border: none;
    border-radius: var(--bti-radius);
    cursor: pointer;
    transition: background .2s, transform .1s, box-shadow .2s;
    box-shadow: 0 4px 16px rgba(232,160,32,.35);
}
.bti-btn-submit:hover {
    background: #f0b030;
    transform: translateY(-1px);
    box-shadow: 0 6px 22px rgba(232,160,32,.5);
}
.bti-btn-submit:active { transform: translateY(0); }

/* ── Succès ──────────────────────────────────────────────────── */
.bti-success {
    text-align: center;
    padding: 3rem 2rem;
}
.bti-success-icon { font-size: 3.5rem; margin-bottom: 1rem; }
.bti-success h2 { font-size: 1.6rem; color: var(--bti-success); margin: 0 0 .8rem; }
.bti-success p { color: var(--bti-muted); line-height: 1.7; margin: 0 0 1rem; }
.bti-success-reminder {
    background: var(--bti-surface);
    border: 1px solid var(--bti-border);
    border-radius: var(--bti-radius);
    padding: 1.2rem;
    margin: 1.2rem 0;
    text-align: left;
}
.bti-success-reminder p { margin: .3rem 0; font-size: .92rem; }
.bti-communication {
    font-weight: 700;
    color: var(--bti-accent) !important;
    font-size: 1rem !important;
    margin: .5rem 0 .8rem !important;
}
.bti-success-note { color: var(--bti-accent) !important; font-weight: 600; }

/* ── Liste des inscrits validés ──────────────────────────────── */
.bti-section-inscrits {
    border-top: 2px solid var(--bti-accent);
    border-bottom: none;
}
.bti-inscrits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: .6rem;
}
.bti-inscrit-card {
    display: flex;
    align-items: center;
    gap: .6rem;
    background: var(--bti-surface);
    border: 1px solid var(--bti-border);
    border-radius: var(--bti-radius);
    padding: .55rem .9rem;
    transition: border-color .2s;
}
.bti-inscrit-card:hover {
    border-color: var(--bti-accent);
}
.bti-inscrit-numero {
    font-weight: 800;
    color: var(--bti-accent);
    font-size: .95rem;
    min-width: 36px;
}
.bti-inscrit-nom {
    color: var(--bti-text);
    font-size: .88rem;
    font-weight: 500;
}