.khd-page {
    max-width: 720px;
    margin: 30px auto;
    padding: 0 16px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
    color: #1f2937;
    line-height: 1.55;
}

/* Üst başlık — kongre adı & tarih */
.khd-header {
    text-align: center;
    padding: 24px 20px;
    background: #ffffff;
    border: 1px solid #e5e7eb;
    border-radius: 12px 12px 0 0;
    border-bottom: 3px solid #b91c1c;
}
.khd-header h1, .khd-header h2, .khd-header h3 {
    margin: 0 0 6px;
    color: #111827;
    font-weight: 800;
    letter-spacing: 0.5px;
    line-height: 1.15;
}
.khd-header h2 { font-size: 24px; }
.khd-header p  { margin: 0; color: #4b5563; font-size: 15px; }

.khd-box {
    padding: 30px 32px;
    background: #ffffff;
    border: 1px solid #e5e7eb;
    border-top: 0;
    border-radius: 0 0 12px 12px;
    box-shadow: 0 4px 14px rgba(0,0,0,0.04);
}
/* header yoksa köşeler tamamen yuvarlak */
.khd-page > .khd-box:first-child {
    border-top: 1px solid #e5e7eb;
    border-radius: 12px;
}

.khd-davet { font-size: 15px; color: #1f2937; }
.khd-davet p { margin: 0 0 12px; }
.khd-davet p:last-child { margin-bottom: 0; }
.khd-davet strong { color: #0f172a; }

/* Butonlar — büyük, tam en, sıraya alt alta veya yan yana */
.khd-buttons {
    display: flex;
    gap: 14px;
    margin-top: 28px;
    flex-wrap: wrap;
}
.khd-btn {
    flex: 1;
    min-width: 260px;
    padding: 18px 22px;
    border: 2px solid transparent;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 700;
    letter-spacing: 0.2px;
    cursor: pointer;
    transition: transform 0.1s, box-shadow 0.15s, background 0.15s;
    font-family: inherit;
    color: #fff;
    line-height: 1.3;
    text-align: center;
}
.khd-btn:hover { transform: translateY(-2px); box-shadow: 0 6px 18px rgba(0,0,0,0.14); }
.khd-btn:active { transform: translateY(0); }
.khd-btn-ok { background: #059669; border-color: #047857; }
.khd-btn-ok:hover { background: #047857; }
.khd-btn-no { background: #dc2626; border-color: #b91c1c; }
.khd-btn-no:hover { background: #b91c1c; }

/* Cevap sonrası teşekkür */
.khd-box-done { text-align: center; }
.khd-tesk { font-size: 15.5px; color: #1f2937; }
.khd-tesk h1, .khd-tesk h2, .khd-tesk h3 {
    margin: 0 0 12px;
    color: #059669;
    font-weight: 700;
}
.khd-tesk p { margin: 0 0 12px; }
.khd-tesk p:last-child { margin-bottom: 0; color: #6b7280; }
.khd-tesk em { color: #6b7280; font-style: normal; font-size: 14px; }

/* Hata mesajı */
.khd-msg {
    max-width: 640px;
    margin: 30px auto;
    padding: 18px 22px;
    border-radius: 8px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    font-size: 14px;
    line-height: 1.5;
}
.khd-msg-err { background: #fee2e2; color: #991b1b; border: 1px solid #fecaca; }

@media (max-width: 640px) {
    .khd-header { padding: 20px 14px; }
    .khd-header h2 { font-size: 20px; }
    .khd-box { padding: 22px 18px; }
    .khd-buttons { flex-direction: column; }
    .khd-btn { min-width: 0; padding: 16px 18px; font-size: 15px; }
}