:root {
    --primary-color: #6750A4; --on-primary: #FFFFFF;
    --primary-container: #EADDFF; --on-primary-container: #21005D;
    --bg-color: #FDFBFF; --surface-color: #FEF7FF;
    --surface-variant: #E7E0EC; --text-color: #1C1B1F;
    --text-secondary: #49454F; --radius-small: 16px;
    --radius-large: 28px; --transition-speed: 0.3s;
}

[data-theme="dark"] {
    --primary-color: #D0BCFF; --on-primary: #381E72;
    --primary-container: #4F378B; --on-primary-container: #EADDFF;
    --bg-color: #141218; --surface-color: #211F26;
    --surface-variant: #49454F; --text-color: #E6E0E9;
    --text-secondary: #CAC4D0;
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Be Vietnam Pro', sans-serif; }
body { background-color: var(--bg-color); color: var(--text-color); transition: background-color var(--transition-speed), color var(--transition-speed); display: flex; flex-direction: column; min-height: 100dvh; overflow-x: hidden; }
body.no-anim * { transition: none !important; animation: none !important; }
/* Prevent background scroll when modal open */
.lock-scroll { overflow: hidden; height: 100dvh; }

.nav-bar { position: fixed; bottom: 0; left: 0; width: 100%; background-color: var(--surface-color); display: flex; justify-content: flex-start; align-items: center; padding: 10px 10px calc(10px + env(safe-area-inset-bottom)) 10px; border-top: 1px solid var(--surface-variant); z-index: 100; overflow-x: auto; -webkit-overflow-scrolling: touch; scroll-behavior: smooth; }
.nav-bar::-webkit-scrollbar { display: none; }
.nav-bar { -ms-overflow-style: none; scrollbar-width: none; }
.nav-item { display: flex; flex-direction: column; align-items: center; cursor: pointer; color: var(--text-secondary); transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1), background-color 0.2s; -webkit-tap-highlight-color: transparent; min-width: 75px; flex: 0 0 auto; -webkit-user-select: none; user-select: none; }
.nav-item.active { color: var(--primary-color); font-weight: bold; }
.nav-item span.material-symbols-rounded { padding: 4px 16px; border-radius: 16px; margin-bottom: 4px; transition: background 0.3s; pointer-events: none; }
.nav-item.active span.material-symbols-rounded { background: var(--primary-container); color: var(--on-primary-container); }
.nav-item:hover { transform: translateY(-2px); }

.content-area { padding: 20px 20px calc(110px + env(safe-area-inset-bottom)) 20px; max-width: 1200px; margin: auto; width: 100%; flex-grow: 1; }
.tab-content { display: none; opacity: 0; will-change: opacity, transform; }

/* FIX LỖI TRẮNG MÀN HÌNH: Đảm bảo độ mờ luôn là 1 */
.tab-content.active { display: block; opacity: 1 !important; animation: smoothFadeIn 0.4s cubic-bezier(0.2, 0.8, 0.2, 1) forwards; }

@keyframes smoothFadeIn { 0% { opacity: 0; transform: translateY(15px); } 100% { opacity: 1; transform: translateY(0); } }

.announcement-bar {
    display: none;
    align-items: center;
    background-color: #FFF8E1;
    border: 1.5px solid #F9A825;
    color: #4A3000;
    padding: 12px 18px;
    border-radius: 100px;
    margin-bottom: 25px;
    box-shadow: 0 4px 18px rgba(249, 168, 37, 0.18);

    /* CÁC DÒNG KHÓA CỨNG CHỐNG TRÀN: */
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    overflow: hidden;
}

[data-theme="dark"] .announcement-bar { background-color: #2F2A1A; border-color: #F9A825; color: #FFF8E1; }
.announcement-icon { display: flex; align-items: center; justify-content: center; color: #F9A825; margin-right: 12px; flex-shrink: 0; }
.announcement-icon span { font-size: 24px; }

.announcement-text-container {
    flex-grow: 1;
    overflow: hidden;
    white-space: nowrap;
    position: relative;

    /* ÉP PHẦN TỬ CON KHÔNG ĐƯỢC PHÌNH TO: */
    min-width: 0;
    width: 0;
}

.announcement-text { display: inline-block; font-weight: 500; font-size: 1.05rem; color: var(--text-color); }
.announcement-text[aria-paused="true"] { opacity: 0.95; }
.announcement-close { display: flex; align-items: center; justify-content: center; margin-left: 12px; flex-shrink: 0; cursor: pointer; color: var(--text-secondary); border-radius: 50%; padding: 4px; transition: background 0.2s, color 0.2s; }
.announcement-close:hover { background: var(--surface-variant); color: #F44336; }

.header-placeholder { position: relative; width: 100%; height: 200px; border-radius: var(--radius-large); margin-bottom: 25px; overflow: hidden; box-shadow: 0 4px 12px rgba(0,0,0,0.1); }
.header-placeholder img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s ease; will-change: transform; }
.header-placeholder:hover img { transform: scale(1.05); }

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    .header-placeholder img, .card:hover, .zoomable { transition: none !important; }
    .announcement-text { transition: none !important; animation: none !important; }
}
.header-overlay { position: absolute; top: 0; left: 0; width: 100%; height: 100%; display: flex; flex-direction: column; justify-content: center; align-items: center; color: #fff; text-align: center; padding: 20px; pointer-events: none; }
.header-overlay h1 { font-size: 2.2rem; margin-bottom: 10px; text-shadow: 2px 2px 6px rgba(0,0,0,0.8); }

.section-banner { display: flex; align-items: center; gap: 18px; background-color: var(--surface-color); border: 1px solid var(--surface-variant); border-radius: 32px; padding: 22px 24px; margin-bottom: 20px; box-shadow: 0 12px 32px rgba(0, 0, 0, 0.06); position: relative; overflow: hidden; }
.section-banner::before { content: ""; position: absolute; inset: 0; background: radial-gradient(circle at top left, rgba(255, 255, 255, 0.35), transparent 28%), radial-gradient(circle at bottom right, rgba(103, 80, 164, 0.08), transparent 24%); pointer-events: none; }
.section-banner-content { position: relative; display: flex; align-items: center; gap: 14px; width: 100%; }
.section-banner-icon { display: none; }
.section-banner-label { margin: 0 0 6px; font-size: 0.96rem; font-weight: 700; letter-spacing: 0.02em; color: var(--text-secondary); }
.section-banner-desc { margin: 4px 0 0; color: var(--text-secondary); line-height: 1.6; max-width: 620px; }
.section-banner h1 { margin: 0; font-size: 1.9rem; color: var(--text-color); }

.section-title { margin: 30px 0 15px 0; font-size: 1.5rem; }
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
.card { background-color: var(--surface-color); border: 1px solid var(--surface-variant); border-radius: var(--radius-large); padding: 24px; transition: transform 0.3s ease, box-shadow 0.3s ease; }
.card:hover { transform: translateY(-5px); box-shadow: 0 8px 20px rgba(0,0,0,0.08); }
.card h2, .card h3 { margin-bottom: 12px; color: var(--primary-color); }
.card img { width: 100%; border-radius: var(--radius-small); margin-bottom: 15px; object-fit: cover; aspect-ratio: 16/9; background-color: var(--surface-variant); display: flex; align-items: center; justify-content: center; overflow: hidden; }

.dimmed-text { opacity: 0.6; font-size: 0.95em; filter: saturate(0.8); color: var(--text-secondary); font-style: italic; }

.zoomable { cursor: zoom-in; transition: opacity 0.3s; }
.zoomable:hover { opacity: 0.8; }
.modal { display: none; position: fixed; z-index: 9999; left: 0; top: 0; width: 100%; height: 100%; background-color: rgba(0,0,0,0.9); backdrop-filter: blur(5px); opacity: 0; transition: opacity 0.3s cubic-bezier(0.2, 0.8, 0.2, 1); }
.modal.show { opacity: 1; display: block; }
.modal-content { margin: auto; display: block; width: 90%; max-width: 900px; position: relative; top: 50%; transform: translateY(-50%) scale(0.9); transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1); border-radius: var(--radius-small); }
.modal.show .modal-content { transform: translateY(-50%) scale(1); }
.close { position: absolute; top: 15px; right: 25px; color: #fff; font-size: 40px; font-weight: bold; cursor: pointer; z-index: 10000; }

.rank-card .price { font-size: 1.5rem; font-weight: bold; color: var(--on-primary-container); background: var(--primary-container); display: inline-block; padding: 6px 14px; border-radius: 10px; margin-bottom: 15px; }
.rank-card ul { list-style-type: none; padding-left: 0; margin-top: 10px; }
.rank-card li { margin-bottom: 10px; line-height: 1.5; color: var(--text-secondary); padding-left: 10px; border-left: 3px solid var(--primary-container); }
ul { list-style-position: inside; color: var(--text-secondary); line-height: 1.6; }
.command-list li { margin-bottom: 12px; line-height: 1.6; }
.warp-card { background: #ffffff; border: 1px solid var(--surface-variant); border-radius: 20px; padding: 14px 16px; margin-bottom: 12px; }
.warp-card-arrow { font-weight: 700; margin-bottom: 10px; display: inline-flex; align-items: center; gap: 10px; color: var(--text-color); }
.warp-command-list { list-style: none; padding-left: 0; margin: 0; color: var(--text-secondary); line-height: 1.65; }
.warp-command-list li { margin-bottom: 8px; font-size: 0.98rem; }
.warp-command-list li strong { color: var(--text-color); }

.btn-primary { background-color: var(--primary-color); color: var(--on-primary); border: none; padding: 14px 24px; border-radius: 100px; font-size: 1rem; cursor: pointer; font-weight: 600; transition: background-color 0.2s, transform 0.1s; }
.btn-primary:active { transform: scale(0.98); }

.form-group { margin-bottom: 20px; }
.form-label { display: block; margin-bottom: 8px; font-weight: 500; color: var(--primary-color); }
.form-input { width: 100%; padding: 14px 16px; border-radius: 12px; border: 1.5px solid var(--surface-variant); background-color: var(--bg-color); color: var(--text-color); font-size: 1rem; transition: all 0.3s; }
.form-input:focus { outline: none; border-color: var(--primary-color); box-shadow: 0 0 0 3px var(--primary-container); }
.checkbox-group { display: flex; align-items: center; gap: 12px; background-color: var(--surface-variant); padding: 14px; border-radius: 12px; }
select.form-input { cursor: pointer; position: relative; z-index: 10; -webkit-appearance: menulist-button; appearance: menulist-button; }

.setting-item { display: flex; justify-content: space-between; align-items: center; font-size: 1.1rem; font-weight: 500; }
.switch { position: relative; display: inline-block; width: 52px; height: 28px; flex-shrink: 0; }
.switch input { opacity: 0; width: 0; height: 0; }
.slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: #938F99; transition: .4s cubic-bezier(0.4, 0, 0.2, 1); }
.slider:before { position: absolute; content: ""; height: 20px; width: 20px; left: 4px; bottom: 4px; background-color: #fff; transition: .4s cubic-bezier(0.4, 0, 0.2, 1); box-shadow: 0 1px 3px rgba(0,0,0,0.2); }
input:checked + .slider { background-color: var(--primary-color); }
input:checked + .slider:before { transform: translateX(24px); background-color: var(--on-primary); }
.slider.round { border-radius: 34px; }
.slider.round:before { border-radius: 50%; }

footer { text-align: center; padding: 20px 0; color: var(--text-secondary); font-size: 0.95rem; margin-top: 40px; border-top: 1px solid var(--surface-variant); }

@media (min-width: 768px) {
    body { flex-direction: row; }
    .nav-bar { position: fixed; left: 0; top: 0; width: 220px; height: 100vh; flex-direction: column; justify-content: flex-start; padding-top: 30px; border-right: 1px solid var(--surface-variant); border-top: none; box-shadow: 2px 0 10px rgba(0,0,0,0.02); }
    .nav-item { flex-direction: row; width: 88%; margin: 4px auto; padding: 12px 16px; border-radius: 12px; align-items: center; }
    .nav-item span.material-symbols-rounded { margin-bottom: 0; margin-right: 12px; padding: 0; }
    .nav-item.active { background-color: var(--primary-container); }
    .nav-item.active span.material-symbols-rounded { background: transparent; pointer-events: none; }
    .content-area { margin-left: 220px; padding: 40px 50px; max-width: 1300px; }
}
@media (max-width: 768px) {
    .section-banner { flex-direction: column; align-items: flex-start; padding: 18px 18px; }
    .section-banner-content { gap: 12px; }
    .card { transform: none !important; transition: background-color var(--transition-speed), border var(--transition-speed) !important; }
    /* Reduce heavy shadows and hover transforms on mobile for performance */
    .card { box-shadow: none; }
    .nav-bar { padding: 8px 8px calc(8px + env(safe-area-inset-bottom)) 8px; }
}
/* ==========================================
 * TÙY CHỈNH MŨI TÊN THẺ DETAILS/SUMMARY
 * ========================================== */

/* 1. Ẩn mũi tên mặc định của trình duyệt */
details summary {
    list-style: none;
    position: relative;
    padding-right: 25px; /* Chừa một khoảng trống bên phải để đặt mũi tên mới */
}

/* Ẩn mũi tên trên các trình duyệt lõi WebKit (Chrome/Safari cũ) */
details summary::-webkit-details-marker {
    display: none;
}

/* 2. Tạo mũi tên mới nằm ở phía cuối (bên phải) */
details summary::after {
    content: '▼'; /* Ký tự mũi tên */
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.85em;
    transition: transform 0.3s ease, color 0.3s ease;
    color: var(--text-secondary);
}

/* 3. Hiệu ứng xoay mũi tên ngược lên khi bấm mở */
details[open] summary::after {
    transform: translateY(-50%) rotate(180deg);
    color: var(--primary-color);
}