/* =====================================================================
   ปุ่มลอยประชาสัมพันธ์ + แบนเนอร์ย่อ  (วางต่อท้าย style.css)
   ประสิทธิภาพ: ไม่มี backdrop-filter, ขยับด้วย transform/opacity เท่านั้น
   ===================================================================== */
.promo {
    position: fixed;
    right: max(16px, env(safe-area-inset-right));
    bottom: max(96px, calc(env(safe-area-inset-bottom) + 24px));
    z-index: 1000;                 /* ต่ำกว่า SweetAlert (1060) และหน้าต่างกติกา (10000) */
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 14px;
    pointer-events: none;
}
.promo > * { pointer-events: auto; }
.promo[data-side="left"] {
    right: auto;
    left: max(16px, env(safe-area-inset-left));
    align-items: flex-start;
}

/* ---------- ปุ่มลอย ---------- */
.promo-btn {
    position: relative;
    width: 58px;
    height: 58px;
    border: 0;
    border-radius: 50%;
    display: grid;
    place-items: center;
    cursor: pointer;
    color: #fff;
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    box-shadow: 0 4px 0 #3730a3, 0 14px 24px -6px rgba(79, 70, 229, 0.6), inset 0 1px 0 rgba(255, 255, 255, 0.35);
    transition: transform 0.12s ease, box-shadow 0.12s ease;
    animation: promoBob 4s ease-in-out infinite;
}
.promo-btn:hover { transform: translateY(-2px) scale(1.05); }
.promo-btn:active { transform: translateY(3px); box-shadow: 0 1px 0 #3730a3, 0 4px 10px rgba(79, 70, 229, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.3); }
.promo-btn:focus-visible, .promo-x:focus-visible, .promo-cta:focus-visible, .promo-nav button:focus-visible {
    outline: 2px solid #fcd34d;
    outline-offset: 3px;
}
/* วงคลื่นกระเพื่อมเรียกความสนใจ */
.promo-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 50%;
    border: 2px solid #a78bfa;
    pointer-events: none;
    animation: promoPing 2.4s ease-out infinite;
}
.promo.open .promo-btn, .promo.open .promo-btn::before { animation-play-state: paused; }
.promo.open .promo-btn::before { opacity: 0; }

/* ไอคอนสลับเมกะโฟน <-> กากบาท */
.promo-ico { position: relative; width: 24px; height: 24px; display: block; }
.promo-ico svg { position: absolute; inset: 0; width: 24px; height: 24px; transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1), opacity 0.2s; }
.promo-ico .i-x { opacity: 0; transform: rotate(-90deg) scale(0.6); }
.promo.open .promo-ico .i-mega { opacity: 0; transform: rotate(90deg) scale(0.6); }
.promo.open .promo-ico .i-x { opacity: 1; transform: none; }

/* จุดแจ้งเตือนทอง */
.promo-dot {
    position: absolute;
    top: -4px;
    right: -4px;
    min-width: 20px;
    height: 20px;
    padding: 0 5px;
    border-radius: 999px;
    display: grid;
    place-items: center;
    font-size: 0.7rem;
    font-weight: 700;
    color: #451a03;
    background: linear-gradient(135deg, #f59e0b, #fcd34d);
    box-shadow: 0 2px 8px rgba(245, 158, 11, 0.6);
    animation: promoBeat 1.8s ease-in-out infinite;
}
.promo[data-side="left"] .promo-dot { right: auto; left: -4px; }

/* ป้ายชื่อเมื่อชี้ (เฉพาะอุปกรณ์ที่มีเมาส์) */
.promo-tip {
    position: absolute;
    top: 50%;
    right: calc(100% + 12px);
    margin-top: -16px;
    padding: 0.4rem 0.85rem;
    border-radius: 999px;
    font-size: 0.78rem;
    line-height: 1;
    white-space: nowrap;
    color: #e0e7ff;
    background: rgba(15, 23, 42, 0.94);
    border: 1px solid rgba(167, 139, 250, 0.35);
    opacity: 0;
    transform: translateX(8px);
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
}
.promo[data-side="left"] .promo-tip { right: auto; left: calc(100% + 12px); transform: translateX(-8px); }
@media (hover: hover) {
    .promo:not(.open) .promo-btn:hover .promo-tip, .promo:not(.open) .promo-btn:focus-visible .promo-tip { opacity: 1; transform: none; }
}

/* ---------- แบนเนอร์ย่อ ---------- */
.promo-card {
    position: relative;
    width: min(320px, calc(100vw - 32px));
    border-radius: 18px;
    overflow: hidden;
    color: #e0e7ff;
    background: rgba(15, 23, 42, 0.96);
    border: 1px solid rgba(167, 139, 250, 0.35);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1), 0 24px 50px -12px rgba(0, 0, 0, 0.7);
    outline: none;
    display: flex;
    flex-direction: column;
    max-height: calc(100vh - 190px);
    max-height: calc(100dvh - 190px);
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px) scale(0.95);
    transform-origin: 100% 100%;
    transition: opacity 0.22s ease, transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1), visibility 0s linear 0.3s;
}
.promo[data-side="left"] .promo-card { transform-origin: 0 100%; }
.promo.open .promo-card { opacity: 1; visibility: visible; transform: none; transition-delay: 0s; }

.promo-x {
    position: absolute;
    top: 8px;
    right: 8px;
    z-index: 2;
    width: 30px;
    height: 30px;
    border: 0;
    border-radius: 50%;
    display: grid;
    place-items: center;
    cursor: pointer;
    color: #fff;
    background: rgba(8, 11, 19, 0.6);
}
.promo-x svg { width: 16px; height: 16px; }
.promo-x:hover { background: rgba(139, 92, 246, 0.85); }

.promo-slide { flex: 1; min-height: 0; overflow-y: auto; overscroll-behavior: contain; }
.promo-slide.swap { animation: promoSwap 0.35s cubic-bezier(0.2, 0.8, 0.2, 1); }
.promo-media {
    position: relative;
    aspect-ratio: 16 / 9;
    display: grid;
    place-items: center;
    color: rgba(255, 255, 255, 0.35);
    background: linear-gradient(135deg, #312e81, #6d28d9);
}
.promo-media .promo-fb svg { width: 44px; height: 44px; }
.promo-media img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.promo-media::after { /* เงาไล่ด้านล่างให้ภาพกลืนกับเนื้อหา */
    content: '';
    position: absolute;
    inset: auto 0 0 0;
    height: 40%;
    background: linear-gradient(to top, rgba(15, 23, 42, 0.96), transparent);
}
.promo-body { padding: 0.9rem 1.1rem 1.1rem; }
.promo-tag {
    display: inline-block;
    margin-bottom: 0.5rem;
    padding: 0.15rem 0.65rem;
    border-radius: 999px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.03em;
    color: #451a03;
    background: linear-gradient(135deg, #f59e0b, #fcd34d);
}
.promo-title { margin: 0 0 0.35rem; font-size: 1.02rem; font-weight: 600; line-height: 1.35; color: #fff; }
.promo-text {
    margin: 0 0 0.9rem;
    font-size: 0.82rem;
    line-height: 1.55;
    color: #c7d2fe;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.promo-cta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    width: 100%;
    padding: 0.65rem 1rem;
    border: 0;
    border-radius: 12px;
    cursor: pointer;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    color: #fff;
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    box-shadow: 0 3px 0 #3730a3, 0 10px 18px -6px rgba(79, 70, 229, 0.55);
    transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.promo-cta svg { width: 16px; height: 16px; }
.promo-cta:hover { transform: translateY(-2px); box-shadow: 0 5px 0 #3730a3, 0 14px 22px -6px rgba(79, 70, 229, 0.6); }
.promo-cta:active { transform: translateY(2px); box-shadow: 0 1px 0 #3730a3; }

.promo-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 0.8rem;
    border-top: 1px solid rgba(255, 255, 255, 0.07);
    background: rgba(0, 0, 0, 0.18);
    flex-shrink: 0;
}
.promo-nav:empty { display: none; }
.promo-nav button { width: 28px; height: 28px; border: 0; border-radius: 50%; display: grid; place-items: center; cursor: pointer; color: #c7d2fe; background: transparent; }
.promo-nav button:hover { background: rgba(255, 255, 255, 0.1); }
.promo-nav svg { width: 16px; height: 16px; }
.promo-dots { display: flex; gap: 6px; }
.promo-dots button { width: 8px; height: 8px; padding: 0; background: rgba(255, 255, 255, 0.25); }
.promo-dots button[aria-current="true"] { width: 22px; border-radius: 999px; background: linear-gradient(90deg, #a78bfa, #67e8f9); }

@keyframes promoBob { 0%, 100% { translate: 0 0; } 50% { translate: 0 -6px; } }
@keyframes promoPing { from { transform: scale(1); opacity: 0.8; } to { transform: scale(1.6); opacity: 0; } }
@keyframes promoBeat { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.18); } }
@keyframes promoSwap { from { opacity: 0; transform: translateX(14px); } to { opacity: 1; transform: none; } }

/* ซ่อนในหน้าลงทะเบียน (กันบังช่องกรอก) — ลบบรรทัดนี้ถ้าต้องการให้แสดงทุกหน้า */
body:has(#view-register:not(.hidden)) .promo { display: none; }

@media (max-height: 560px) {
    .promo-media { aspect-ratio: 21 / 9; }
}
@media (max-width: 480px) {
    .promo-btn { width: 54px; height: 54px; }
}
@media print { .promo { display: none; } }
@media (prefers-reduced-motion: reduce) {
    .promo-btn, .promo-btn::before, .promo-dot, .promo-slide.swap { animation: none; }
    .promo-card, .promo-ico svg { transition: none; }
}