/* --- Trang Chi Tiết Sự Kiện & Mua Vé --- */
.event-details-layout, .checkout-layout, .seating-layout { display: grid; gap: 3rem; align-items: start; }
.related-events { margin-top: 6rem; }
.related-grid { grid-auto-columns: calc((100% / 4) - 1.2rem); gap: 1.5rem; padding: 0.5rem;}
.event-card { display: block; text-decoration: none; background: var(--card-bg); border: 1px solid var(--border-color); border-radius: 12px; overflow: hidden; transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease; }
.event-card:hover { transform: translateY(-5px); border-color: var(--primary-purple); box-shadow: 0 8px 25px rgba(143, 0, 255, 0.25); }
.event-card img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; }
.event-card-info { padding: 1.25rem; }
.event-card .event-title { font-size: 1.1rem; font-weight: 600; margin: 0 0 0.5rem 0; color: var(--text-light); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.event-card .event-price { font-size: 1rem; font-weight: 600; color: var(--gold); }

/* --- Step 1: Details --- */
.event-details-layout { grid-template-columns: 1fr 1fr; }
.event-main-image img { border-radius: 16px; width: 100%; height: 100%; object-fit: cover; }
.event-main-info { display: flex; flex-direction: column; height: 100%; }
.event-main-info #btn-go-to-seating { margin-top: auto; }
.event-page-title { font-size: 2.5rem; margin-bottom: 1.5rem; line-height: 1.2; }
.info-line { display: flex; align-items: center; gap: 1rem; margin-bottom: 0.75rem; color: var(--text-muted); }
.info-line i { color: var(--primary-purple); font-size: 1.1rem; width: 20px; text-align: center; }
.section-block { margin-top: 2rem; padding-top: 2rem; border-top: 1px solid var(--border-color); }
.section-block h3 { margin-bottom: 1rem; font-size: 1.2rem; }
.ticket-type { display: flex; justify-content: space-between; align-items: center; padding: 1rem; border-radius: 8px; background: var(--card-bg); }
.ticket-type:not(:last-child) { margin-bottom: 1rem; }
.ticket-info h4 { font-size: 1.1rem; margin-bottom: 0.25rem; }
.ticket-info .ticket-perks { color: var(--text-muted); font-size: 0.9rem; }
.ticket-price { font-size: 1.2rem; font-weight: 700; color: var(--gold); }

/* --- Back Button --- */
.relative-container { position: relative; padding-top: 4rem; }
.back-btn { position: absolute; top: 0; left: 0; background: none; border: 1px solid var(--border-color); color: var(--text-muted); font-size: 1rem; font-weight: 500; cursor: pointer; display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.5rem 1rem; border-radius: 20px; transition: all 0.3s ease; }
.back-btn:hover { color: var(--text-light); background-color: var(--btn-secondary-bg); }

/* --- Step 2: Seating --- */
.seating-layout { grid-template-columns: 1fr 380px; }
.seat-map-container { background: var(--card-bg); border: 1px solid var(--border-color); border-radius: 12px; padding: 2rem; }
.stage { text-align: center; padding: 1rem; background: var(--dark-bg); border: 1px solid var(--border-color); border-radius: 8px; margin-bottom: 2rem; font-weight: 600; letter-spacing: 2px; }
.seat-map { display: grid; grid-template-columns: repeat(14, 1fr); gap: 0.5rem; margin-bottom: 2rem; }
.seat { aspect-ratio: 1/1; border-radius: 4px; cursor: pointer; transition: background-color 0.2s, transform 0.2s; }
.seat.available-vip { background: var(--primary-purple); }
.seat.available-standard { background: var(--secondary-blue); }
.seat.sold { background: var(--btn-secondary-bg); cursor: not-allowed; opacity: 0.5; }
.seat.selected { background: var(--gold); transform: scale(1.15); box-shadow: 0 0 10px var(--gold); }
.seat-legend { display: flex; flex-wrap: wrap; gap: 1.5rem; justify-content: center; padding-top: 1.5rem; border-top: 1px solid var(--border-color); }
.seat-legend > div { display: flex; align-items: center; gap: 0.75rem; font-size: 0.9rem; }
.seat-example { width: 20px; height: 20px; border-radius: 4px; }
.seating-summary { background: var(--card-bg); padding: 2rem; border-radius: 12px; border: 1px solid var(--border-color); position: sticky; top: 100px; }
.seating-summary h3 { font-size: 1.5rem; margin-bottom: 1.5rem; }
#selected-seats-list .no-seats { color: var(--text-muted); }
.summary-ticket-type { margin-bottom: 1rem; }
.summary-ticket-type h4 { font-size: 1.1rem; }
.summary-ticket-type p { font-size: 0.9rem; color: var(--text-muted); word-break: break-all; }
.total-price { display: flex; justify-content: space-between; font-size: 1.2rem; font-weight: 700; margin-top: 1.5rem; padding-top: 1.5rem; border-top: 1px solid var(--border-color); }
#btn-go-to-checkout:disabled { background: var(--btn-secondary-bg); cursor: not-allowed; opacity: 0.6; box-shadow: none; }
#btn-go-to-checkout:disabled:hover { background: var(--btn-secondary-bg); }

/* --- Step 3: Checkout --- */
.checkout-layout { grid-template-columns: 1.2fr 1fr; }
.order-summary-card, .payment-card { background: var(--card-bg); padding: 2rem; border-radius: 12px; border: 1px solid var(--border-color); }
.checkout-title { font-size: 1.25rem; margin-bottom: 1.5rem; }
.order-event-info { padding-bottom: 1.5rem; margin-bottom: 1.5rem; border-bottom: 1px solid var(--border-color); }
.order-event-info h4 { font-size: 1.2rem; margin-bottom: 0.75rem; }
.order-event-info p { display: flex; align-items: center; gap: 0.75rem; color: var(--text-muted); }
.order-timer { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1.5rem; }
.timer-display { font-weight: 700; color: var(--pink); font-size: 1.1rem;}
.order-details { margin-bottom: 1.5rem; }
.detail-row { display: flex; justify-content: space-between; margin-bottom: 0.5rem; }
.detail-value { font-weight: 500; }
.total-temp { display: flex; justify-content: space-between; font-size: 1.2rem; font-weight: 700; padding-top: 1.5rem; border-top: 1px solid var(--border-color); }
.form-group { margin-bottom: 2rem; }
.form-group label { display: block; margin-bottom: 0.5rem; color: var(--text-muted); }
.form-group select, .promo-code input { width: 100%; padding: 0.75rem; background: var(--input-bg); border: 1px solid var(--border-color); color: var(--text-light); border-radius: 8px; font-family: 'Inter', sans-serif; font-size: 1rem;}
.form-group select:focus, .promo-code input:focus { outline: none; border-color: var(--primary-purple); }
.payment-methods { display: flex; flex-direction: column; gap: 1rem; margin-bottom: 2rem; }
.payment-option { display: flex; align-items: center; gap: 1rem; padding: 1rem; border: 1px solid var(--border-color); border-radius: 8px; cursor: pointer; transition: border-color 0.3s; }
.payment-option:hover { border-color: var(--secondary-blue); }
.payment-option input { display: none; }
.custom-radio { width: 20px; height: 20px; border: 2px solid var(--border-color); border-radius: 50%; display: inline-block; position: relative; transition: border-color 0.3s;}
.payment-option input:checked + .custom-radio { border-color: var(--primary-purple); }
.payment-option input:checked + .custom-radio::after { content: ''; width: 10px; height: 10px; background: var(--primary-purple); border-radius: 50%; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); }
.promo-code { display: flex; gap: 0.5rem; margin-bottom: 2rem; }
.promo-code input { flex-grow: 1; }

/* --- Step 4: Success --- */
.success-icon { font-size: 5rem; color: var(--green); margin-bottom: 1.5rem; line-height: 1; }
.success-actions { display: flex; gap: 1rem; justify-content: center; margin-top: 2.5rem; }

/* --- Responsive cho trang chi tiết sự kiện --- */
@media (max-width: 1024px) {
    .event-details-layout, .seating-layout, .checkout-layout { grid-template-columns: 1fr; }
    .seating-summary { position: static; margin-top: 2rem; }
    .related-grid { grid-auto-columns: calc((100% / 3) - 1rem); }
    .event-main-image img { height: auto; aspect-ratio: 16/10; }
    .event-main-info { height: auto; }
    .event-main-info #btn-go-to-seating { margin-top: 2rem; }
}

@media (max-width: 767px) {
    .related-grid { grid-auto-columns: 80%; }
    .seat-map { gap: 4px; }
    .seating-layout { gap: 1.5rem; }
}