/* =================================================================== */
/* --- 1. BIẾN MÀU VÀ THIẾT LẬP CHUNG (RESET) --- */
/* =================================================================== */
:root {
    --background-dark: #121826;
    --card-dark: #1E293B;
    --border-color: #334155;
    --primary-accent: #6a3ff6;
    --text-light: #F8FAFC;
    --text-secondary: #94A3B8;
    --message-user-bg: #4F46E5;
    --message-other-bg: #374151;
    --status-green: #28a745;
    --status-yellow: #ffc107;
    --status-red: #dc3545;
    --cyber-neon: #00ffe1;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: "Inter var", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Major Mono Display", monospace;
    background-color: var(--background-dark);
    color: var(--text-light);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    font-size: 16px;
}

/* =================================================================== */
/* --- 2. LAYOUT CHÍNH (USER & ADMIN) --- */
/* =================================================================== */
.main-layout {
    display: flex;
    width: 95vw;
    height: 95vh;
    max-width: 1400px;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    background-color: var(--card-dark);
    overflow: hidden;
    box-shadow: 0 10px 25px rgba(0,0,0,0.3);
}

.sidebar {
    width: 280px;
    background-color: var(--background-dark);
    padding: 10px;
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border-color);
    flex-shrink: 0; /* Ngăn sidebar co lại */
}

.content-window {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden; /* Ngăn scroll ở cấp cao nhất */
}

.page-content {
    display: none;
    flex-direction: column;
    flex-grow: 1;
    height: 100%;
}
.page-content.active {
    display: flex;
}
.page-header {
    padding: 25px 30px;
    background-color: var(--background-dark);
    border-bottom: 1px solid var(--border-color);
    text-align: left;
    flex-shrink: 0;
}
.page-header h2 {
    margin: 0;
    font-size: 1.5rem;
}
.page-body {
    padding: 30px;
    flex-grow: 1;
    overflow-y: auto;
}

/* --- Style cho Logo --- */
.sidebar-logo{
  display:flex;align-items:center;gap:14px;padding-bottom:16px;margin-bottom:18px;
  border-bottom:1px solid var(--border-color);color:var(--text-light);text-decoration:none;
}
.sidebar-logo img{height:60px;filter:drop-shadow(0 4px 10px rgba(124,131,255,.25));}
.sidebar-logo span{font-weight:700;letter-spacing:.2px}

/* --- Cập nhật Header Mobile --- */
.mobile-header {
    justify-content: space-between; /* Dàn các item ra */
}
.mobile-logo {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    height: 35px; /* Chiều cao logo mobile */
}
.mobile-logo img {
    height: 100%;
}

/* Quan trọng: Đảm bảo lớp phủ che đúng */
@media (max-width: 992px) {
    .mobile-overlay.show {
        display: block;
    }
}

.nav-menu li a {
    position: relative; /* Cần để định vị chấm thông báo */
}
.notification-dot {
    display: block;
    width: 8px;
    height: 8px;
    background-color: #e63946;
    border-radius: 50%;
    position: absolute;
    top: 12px;
    right: 12px;
    border: 1px solid var(--sidebar-bg);
}
/* Style cho khu vực input chat mới */
.input-area-wrapper {
    padding: 15px;
    background-color: var(--background-dark);
    border-top: 1px solid var(--border-color);
}
.input-area button { /* Ghi đè lại style nút gửi */
    width: 44px; height: 44px;
    padding: 0; border-radius: 50%;
    flex-shrink: 0;
}
.input-area button i { margin: 0; width: auto; }
.message { position: relative; padding-bottom: 25px; }
.message-time {
    position: absolute;
    bottom: 8px;
    right: 15px;
    font-size: 0.75rem;
    color: var(--text-secondary);
}
.message.admin .message-time {
    left: 15px;
    right: auto;
}
.message-content { position: relative; }
.reply-icon {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    right: -30px; /* Hoặc right: -30px cho .message.user */
    color: var(--text-secondary);
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.2s;
}
.message:hover .reply-icon { opacity: 1; }
.message.user .reply-icon {
    order: 2; /* Luôn nằm ở cuối */
    left: auto;
    right: -30px; 
}

.reply-context {
    width: 100%; padding: 10px;
    background-color: var(--background-dark);
    border-radius: 8px; margin-bottom: 10px;
    border-left: 3px solid var(--primary-accent);
    display: flex; justify-content: space-between;
}
.reply-sender { font-weight: bold; font-size: 0.9rem; }
.reply-text { font-size: 0.9rem; color: var(--text-secondary); }
#cancel-reply-btn { background:none; border:none; color:var(--text-secondary); font-size:1.5rem; cursor:pointer; }

/* CSS cho tin nhắn được reply */
.replied-message {
    background-color: rgba(0,0,0,0.2);
    padding: 8px;
    border-radius: 6px;
    margin-bottom: 8px;
    border-left: 3px solid var(--primary-accent);
}
.replied-message .sender { font-weight: bold; font-size: 0.8rem; }
.replied-message .content { font-size: 0.9rem; color: var(--text-secondary); }
/* =================================================================== */
/* --- 3. CÁC THÀNH PHẦN TÁI SỬ DỤNG --- */
/* =================================================================== */

/* --- Card --- */
.card {
    width: 100%;
    background-color: var(--background-dark);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    margin-bottom: 20px;
}
.card-header {
    padding: 15px 20px;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--card-dark);
}
.card-header h3 {
    margin: 0;
    font-size: 1.2rem;
}
.card-body {
    padding: 20px;
}

/* --- Form --- */
.form-group {
    margin-bottom: 20px;
    text-align: left;
}
.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-secondary);
}
.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: #121826;
    color: var(--text-light);
    font-size: 1rem;
}
.form-row {
    display: flex;
    gap: 20px;
    align-items: flex-end;
}
.form-row .form-group { flex: 1; }

/* --- Button --- */
.buy-button, .save-btn, .action-btn {
    background-color: var(--primary-accent);
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.2s;
}
.action-btn {
    padding: 5px 10px;
    margin-right: 5px;
}
.edit-btn { background-color: #007bff; }
.delete-btn { background-color: var(--status-red); }

/* --- Modal --- */
.modal-overlay {
    position: fixed; top: 0; left: 0;
    width: 100%; height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex; /* Sửa lỗi lệch góc */
    justify-content: center;
    align-items: center;
    z-index: 1000;
}
.modal-content {
    position: relative; /* <-- THÊM DÒNG NÀY */
    background-color: var(--card-dark);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    width: 100%;
    max-width: 500px;
    box-shadow: 0 5px 25px rgba(0,0,0,0.5);
    max-height: 90vh; 
    display: flex; /* Sử dụng flexbox để các thành phần co giãn */
    flex-direction: column;
}
.modal-header {
    display: flex; justify-content: space-between; align-items: center;
    padding: 15px 20px; border-bottom: 1px solid var(--border-color);
}
.modal-header h2 { margin: 0; font-size: 1.2rem; }
.close-modal-btn { background: none; border: none; font-size: 1.8rem; color: var(--text-secondary); cursor: pointer; }
.modal-body { padding: 20px; overflow-y: auto; }
.modal-footer { display: flex; justify-content: flex-end; gap: 10px; padding: 15px 20px; border-top: 1px solid var(--border-color); }
.modal-footer button { padding: 10px 20px; border-radius: 8px; border: 1px solid var(--border-color); cursor: pointer; background-color: var(--background-dark); color: var(--text-light); }

/* Tăng chiều rộng tối đa của modal */
.modal-content.modal-split-layout {
    max-width: 900px;
    display: flex;
    flex-direction: row; /* Xếp 2 cột nằm ngang */
    padding: 0;
    overflow: hidden;
}

/* Nút X ở góc */
.modal-close-corner {
    position: absolute;
    top: 10px;
    right: 15px;
    z-index: 12;
}

/* Cột trái */
.modal-split-left {
    width: 40%;
    flex-shrink: 0;
    background-color: var(--background-dark); /* Nền tối hơn một chút */
}
.modal-body-left {
    padding: 5px;
}

/* Cột phải */
.modal-split-right {
    width: 60%;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    overflow: hidden; /* Quan trọng */
}

/* Cho phép chỉ phần thân của cột phải cuộn */
.modal-split-right .modal-body {
    overflow-y: auto;
    flex-grow: 1;
}

/* Ghi đè lại responsive cũ cho modal content */
@media (max-width: 992px) {
    .modal-content.modal-split-layout {
        flex-direction: column; /* Xếp dọc trên mobile */
        width: 95%;
        max-height: 90vh;
    }
    .modal-split-left, .modal-split-right {
        width: 100%;
    }
    .modal-split-right {
        overflow: visible;
    }
    .modal-header-image {
        height: 150px;
    }
}
/* --- Badge --- */
.status-badge {
    display: inline-block; padding: 5px 12px; border-radius: 15px;
    font-size: 0.8rem; font-weight: bold; color: white;
    text-align: center; min-width: 100px;
}
.status-completed { background-color: var(--status-green); }
.status-pending { background-color: var(--status-yellow); color: #343a40; }
.status-cancelled { background-color: var(--status-red); }
.status-free { background-color: var(--text-secondary); color: var(--background-dark); }
.status-premium { background-color: #f59e0b; color: var(--background-dark); }

/* --- DataTables --- */
.dataTables_wrapper { color: var(--text-secondary); }
.dataTables_wrapper th, .dataTables_wrapper td { border-bottom: 1px solid var(--border-color); }
.dataTables_length label, .dataTables_filter label, .dataTables_info { color: var(--text-secondary) !important; }
.dataTables_length select, .dataTables_filter input { border: 1px solid var(--border-color) !important; background-color: #121826 !important; color: var(--text-light) !important; }
.dataTables_paginate .paginate_button { color: var(--text-light) !important; }
.dataTables_paginate .paginate_button.disabled { color: var(--text-secondary) !important; }
.action-btn { border: none; padding: 5px 10px; border-radius: 5px; color: white; cursor: pointer; margin-right: 5px; }
.edit-btn { background-color: #007bff; }
.delete-btn { background-color: var(--status-red); }


/* =================================================================== */
/* --- 4. SIDEBAR (USER & ADMIN) --- */
/* =================================================================== */
.user-profile {
    display: flex; flex-direction: column; align-items: center;
    text-align: center; padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color); margin-bottom: 20px;
}
.user-avatar { position: relative; width: 50px; height: 50px; border-radius: 50%; background-color: var(--primary-accent); display: flex; align-items: center; justify-content: center; font-size: 1.5rem; }
.user-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover; /* Đảm bảo ảnh lấp đầy vòng tròn */
    border-radius: 50%; /* Bo tròn ảnh */
}
.vip-crown { position: absolute; top: -9px; left: -8px; font-size: 1.2rem; color: #f59e0b; transform: rotate(321deg); }
.user-info { margin: 10px 0; }
.user-status-wrapper { display: flex; justify-content: center; align-items: center; gap: 8px; margin-top: 4px; }
.active-plans-wrapper { margin-top: 15px; display: flex; justify-content: center; gap: 10px; }
.vip-plan-icon { width: 32px; height: 32px; }
.vip-plan-icon img { width: 100%; height: 100%; object-fit: contain; border-radius: 4px; }

.nav-menu { list-style: none; padding: 0; margin: 0; flex-grow: 1; }
.nav-menu li a { display: flex; align-items: center; padding: 12px 15px; border-radius: 8px; color: var(--text-secondary); text-decoration: none; margin-bottom: 5px; transition: background-color 0.2s, color 0.2s; text-align: left; }
.nav-menu li a:hover { background-color: var(--card-dark); color: var(--text-light); }
.nav-menu li.active a { background-color: var(--primary-accent); color: var(--text-light); font-weight: bold; }
.nav-menu li a i { width: 30px; text-align: center; font-size: 1.1em; margin-right: 10px; }

.logout-section button { width: 100%; display: flex; align-items: center; padding: 12px 15px; border-radius: 8px; border: none; background-color: transparent; color: var(--text-secondary); cursor: pointer; font-size: 1em; text-align: left; transition: background-color 0.2s, color 0.2s;}
.logout-section button:hover { background-color: var(--status-red); color: var(--text-light); }
.logout-section button i { width: 30px; text-align: center; font-size: 1.1em; margin-right: 10px; }

/* =================================================================== */
/* --- 5. CÁC TRANG CỤ THỂ --- */
/* =================================================================== */

/* --- Trang Mua Gói (User) --- */
.plan-tabs { display: flex; gap: 10px; border-bottom: 1px solid var(--border-color); margin-bottom: 20px; }
.plan-tab-btn { background: none; border: none; color: var(--text-secondary); padding: 10px 20px; cursor: pointer; font-size: 1.1rem; border-bottom: 3px solid transparent; }
.plan-tab-btn.active { color: var(--primary-accent); border-bottom-color: var(--primary-accent); }
.plan-tab-content { display: none; }
.plan-tab-content.active {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); /* Tăng kích thước tối thiểu */
    gap: 20px;
}
.plan-card { text-align: center; display: flex; flex-direction: column; } /* Kế thừa từ .card */
.plan-card-image { width: 100%; height: 150px; margin-bottom: 20px; border-radius: 8px; overflow: hidden; }
.plan-card-image img { width: 100%; height: 100%; object-fit: cover; }
.plan-card h3 { margin-top: auto; padding-top: 15px; }
.plan-card .features { list-style: none; padding: 0; margin-bottom: 20px; color: var(--text-secondary); }

/* --- Trang Chat --- */
.chat-layout { display: flex; width: 100%; height: 100%; }
.chat-sidebar { width: 300px; border-right: 1px solid var(--border-color); padding: 15px; display: flex; flex-direction: column; }
.chat-main { flex-grow: 1; display: flex; flex-direction: column; }
.chat-list-header { padding-bottom: 10px; border-bottom: 1px solid var(--border-color); }
.chat-search-wrapper { position: relative; margin-top: 15px; }
.chat-search-wrapper i { position: absolute; left: 15px; top: 50%; transform: translateY(-50%); color: var(--text-secondary); }
#chat-search-input { width: 100%; background-color: #121826; border: 1px solid var(--border-color); border-radius: 8px; padding: 10px 10px 10px 40px; color: var(--text-light); }
#chat-conversation-list { padding-top: 10px; list-style: none; margin: 0; overflow-y: auto; }
#chat-conversation-list li { display: flex; flex-direction: column; align-items: flex-start; padding: 12px 15px; cursor: pointer; border-radius: 8px; margin-bottom: 5px; transition: background-color 0.2s; gap: 4px; position: relative; }
#chat-conversation-list li:hover { background-color: #2c3a52; }
#chat-conversation-list li.active { background-color: var(--primary-accent); }
.conv-item-header { display: flex; justify-content: space-between; width: 100%; }
.conv-item-name { font-weight: bold; }
.conv-item-time { font-size: 0.75rem; color: var(--text-secondary); }
.conv-item-last-msg { font-size: 0.85rem; color: var(--text-secondary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; width: 100%; }
.new-message-indicator { position: absolute; right: 15px; top: 50%; transform: translateY(-50%); width: 10px; height: 10px; background-color: var(--status-red); border-radius: 50%; }
.messages { flex-grow: 1; padding: 20px; overflow-y: auto; overflow-x: hidden; display: flex; flex-direction: column; }
.message { padding: 10px 15px; border-radius: 18px; max-width: 75%; line-height: 1.5; }
.message.user {align-self: flex-end; border-bottom-right-radius: 4px; }
.message.admin { align-self: flex-start; border-bottom-left-radius: 4px; }
/* --- Nâng cấp Style cho Khu vực Nhập tin nhắn --- */

.input-area {
    padding: 15px;
    background-color: var(--background-dark); /* Đổi nền tối hơn */
    border-top: 1px solid var(--border-color);
}

.input-area input {
    flex-grow: 1;
    padding: 12px 20px; /* Tăng padding */
    border: none; /* Bỏ viền */
    background-color: var(--card-dark); /* Nền tối vừa */
    border-radius: 22px; /* Bo tròn thành hình viên thuốc */
    color: var(--text-light);
    font-size: 1rem;
}

.input-area input:focus {
    outline: none;
    box-shadow: 0 0 0 2px var(--primary-accent); /* Thêm hiệu ứng focus */
}

.input-area button {
    margin-left: 10px;
    padding: 0;
    border: none;
    background-color: var(--primary-accent);
    color: var(--text-light);
    border-radius: 50%; /* Bo tròn thành hình tròn */
    cursor: pointer;
    font-weight: bold;
    transition: background-color 0.2s;
    width: 44px;  /* Đặt kích thước cố định */
    height: 44px;
    flex-shrink: 0; /* Ngăn nút bị co lại */
}
/* --- Nâng cấp Style cho trang Đăng nhập / Đăng ký --- */
body.standalone-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.auth-container {
    text-align: left; /* Căn lề chữ trong form sang trái */
}

.auth-container button {
    width: 100%;
    padding: 12px;
    border: none;
    background-color: var(--primary-accent);
    color: var(--text-light);
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
    font-size: 1rem; /* Chữ to hơn */
}
/* --- Modal Mua Gói & Thanh toán --- */
#plan-detail-modal .modal-content { padding: 0; overflow: hidden; }
.modal-header-image { position: relative; width: 100%; height: 180px; }
#modal-plan-banner-image { width: 100%; height: 100%; object-fit: cover; }
.modal-header-image .close-modal-btn { position: absolute; top: 10px; right: 10px; background-color: rgba(0, 0, 0, 0.5); border-radius: 50%; width: 30px; height: 30px; color: white; display: flex; justify-content: center; align-items: center; line-height: 1; padding: 0; }
#plan-detail-modal .modal-body { padding: 20px; }
#modal-plan-name { margin-top: 0; margin-bottom: 10px; }
.plan-description { padding-bottom: 5px; margin-bottom: 5px; color: var(--text-secondary); }
.plan-description ul { margin-left: 20px; padding: 0; }
/* --- Modal Mua Gói Nâng Cao --- */
.options-title {
    margin-bottom: 15px;
    font-size: 1.1rem;
    color: var(--text-light);
    text-align: left;
}
.options-group {
    margin-bottom: 20px;
}
.options-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.option-btn {
    padding: 10px 15px;
    border: 1px solid var(--border-color);
    background-color: var(--card-dark);
    color: var(--text-secondary);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
}
.option-btn:hover {
    border-color: var(--primary-accent);
    color: var(--text-light);
}
.option-btn.selected {
    background-color: var(--primary-accent);
    color: white;
    font-weight: bold;
    border-color: var(--primary-accent);
}
.plan-options-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 10px; }
.plan-option-item { display: flex; justify-content: space-between; align-items: center; padding: 15px; border: 1px solid var(--border-color); border-radius: 8px; cursor: pointer; transition: all 0.2s; flex-direction: column; align-items: flex-start; gap: 5px; }
.plan-option-item:hover { border-color: var(--primary-accent); }
.plan-option-item.selected { border-color: var(--primary-accent); background-color: rgba(99, 102, 241, 0.1); }
.plan-option-info .duration { font-weight: bold; }
.plan-option-price { font-size: 1.2rem; font-weight: bold; color: var(--primary-accent); }
.discount-area {
    display: flex;
    margin-top: 20px;
    gap: 10px;
    align-items: stretch; /* Căn các item có chiều cao bằng nhau */
}

.discount-area input {
    flex-grow: 1; /* Cho ô input chiếm hết không gian còn lại */
    background-color: var(--background-dark);
    border: 1px solid var(--border-color);
    color: var(--text-light);
    border-radius: 8px;
    padding: 10px 15px;
    font-size: 1rem;
}

.discount-area button {
    border: none;
    background-color: var(--primary-accent);
    color: white;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
    flex-shrink: 0; /* Ngăn nút bị co lại */
}
.summary-section { margin-top: 20px; }
.summary-line { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; font-size: 1.1rem; }
.summary-line strong { font-size: 1.5rem; color: #f59e0b; }
.summary-section .buy-button { width: 100%; margin-top: 10px; }
.payment-layout { display: flex; gap: 30px; }
.qr-code-section, .bank-info-section { flex: 1; }
.qr-image-wrapper { text-align: center; padding: 10px; background-color: white; border-radius: 8px; display: inline-block; }
#qr-code-image { max-width: 220px; width: 100%; }
.bank-details { list-style: none; padding: 0; margin: 0; }
.bank-details li { display: flex; justify-content: space-between; padding: 12px 0; border-bottom: 1px solid var(--border-color); }
.payment-warning { font-size: 0.9rem; color: #f59e0b; margin-top: 15px; }
.payment-footer { display: flex; justify-content: space-between; align-items: center; margin-top: 20px; padding-top: 20px; border-top: 1px solid var(--border-color); }
.price-highlight { color: #e11d48; font-weight: bold; }

/* --- Dashboard Admin (Stat boxes) --- */
.stat-box-wrapper { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 20px; width: 100%; }
.stat-box { padding: 20px; border-radius: 8px; color: white; position: relative; overflow: hidden; }
.stat-box h3 { font-size: 2.5rem; font-weight: bold; margin: 0; }
.stat-box p { margin: 5px 0 0 0; font-size: 1rem; }
.stat-box-link { display: block; background-color: rgba(0,0,0,0.2); text-align: center; padding: 8px 0; margin: 20px -20px -20px -20px; color: white; text-decoration: none; transition: background-color 0.2s; }
.stat-box-link:hover { background-color: rgba(0,0,0,0.4); }
.color-teal { background-color: #16a085; }
.color-green { background-color: #27ae60; }
.color-yellow { background-color: #f39c12; }
.color-red { background-color: var(--status-red); }
.color-blue { background-color: #2980b9; }
.color-cyan { background-color: #00A89D; }
.color-purple { background-color: #8e44ad; }

/* --- Trang Login/Register --- */
.auth-container { width: 100%; max-width: 500px; padding: 40px; background-color: var(--card-dark); border: 1px solid var(--border-color); border-radius: 16px; text-align: left; }
.auth-container h2 { text-align: center; margin-bottom: 30px; }
.auth-container p { text-align: center; margin-top: 20px; color: var(--text-secondary); }
.auth-container a { color: var(--primary-accent); text-decoration: none; }
.auth-container button { width: 100%; }

/* =================================================================== */
/* --- 6. TOOLTIP TÙY CHỈNH --- */
/* =================================================================== */
[data-tooltip] { position: relative; cursor: pointer; }
[data-tooltip]::before { content: ''; position: absolute; bottom: 100%; left: 50%; transform: translateX(-50%) translateY(5px); border: 8px solid transparent; border-top-color: #1E293B; opacity: 0; visibility: hidden; transition: opacity 0.2s, visibility 0.2s; z-index: 11; }
[data-tooltip]::after { content: attr(data-tooltip); position: absolute; bottom: calc(100% + 10px); left: 50%; transform: translateX(-50%); background-color: #1E293B; color: var(--text-light); border: 1px solid var(--border-color); border-radius: 8px; padding: 10px 15px; box-shadow: 0 4px 15px rgba(0,0,0,0.3); font-size: 0.9rem; white-space: pre-line; line-height: 1.6; opacity: 0; visibility: hidden; transition: opacity 0.2s, visibility 0.2s; pointer-events: none; z-index: 10; width: max-content; max-width: 250px; }
[data-tooltip]:hover::before,
[data-tooltip]:hover::after { opacity: 1; visibility: visible; }

/* =================================================================== */
/* --- RESPONSIVE DESIGN (Bản hoàn thiện) --- */
/* =================================================================== */

/* --- Cài đặt chung cho Mobile --- */
.mobile-header { display: none; } /* Mặc định ẩn trên desktop */
.mobile-overlay { display: none; }

/* --- Bắt đầu giao diện Mobile (Màn hình nhỏ hơn 992px) --- */
@media (max-width: 992px) {

    body {
        display: block;
    }
    
    .mobile-logo {
        display: flex;
        align-items: center;
        gap: 15px;
        text-decoration: none;
        color: var(--text-light);
    }
    .mobile-logo { height: 30px; }
    .mobile-logo img { height: 100%; }

    /* Ẩn tiêu đề chữ, chỉ hiện logo và nút menu */
    .mobile-header-title { display: none; } 

    #mobile-menu-btn, #mobile-menu-btn-user {
        background: none; border: none;
        color: var(--text-light); font-size: 1.5rem; cursor: pointer;
        margin-right: 15px;
    }

    .mobile-header-title { font-weight: bold; }

    /* --- Tinh chỉnh các thành phần --- */
    .stat-box-wrapper, .plan-options-list {
        grid-template-columns: 1fr; /* 1 cột trên mobile */
    }
    .plan-tab-content.active {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); /* Cho phép 1 hoặc 2 cột tùy độ rộng */
    }
    /* public/style.css -> bên trong @media */
    /* --- Header Mobile --- */
    .mobile-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 0 15px;
        height: 60px;
        background-color: var(--card-dark);
        border-bottom: 1px solid var(--border-color);
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        z-index: 1000;
    }
    .getlink-body {
        align-items: flex-start; /* Căn lề trên mobile */
        padding-top: 30px;
    }
    
    .getlink-title {
        font-size: 1.8rem;
    }
    .getlink-subtitle {
        font-size: 1rem;
        margin-bottom: 30px;
    }
    
    .supported-websites {
        gap: 10px;
        margin-bottom: 30px;
    }
    
    .getlink-form {
        flex-direction: column; /* Xếp dọc form trên mobile */
        align-items: stretch;
    }
    .stat-box-wrapper, .plan-options-list {
        grid-template-columns: 1fr;
    }
    .plan-tab-content.active {
        grid-template-columns: 1fr; /* Luôn là 1 cột trên mobile */
    }
    /* --- Khu vực nhập tin nhắn trên Mobile --- */
    .input-area-wrapper {
        padding: 10px; /* Giảm padding */
        position: fixed; /* Cố định ở dưới cùng */
        bottom: 0;
        left: 0;
        width: 100%;
        background-color: var(--background-dark);
    }
    
    .messages {
        /* Thêm padding dưới để không bị che bởi ô input */
        padding-bottom: 100px; 
    }
    
    .main-layout {
        width: 100%;
        height: auto;
        min-height: 100vh;
        border-radius: 0;
        border: none;
    }
    
    .sidebar {
        position: fixed; left: -280px; top: 0; height: 100%;
        z-index: 1002; transition: left 0.3s ease;
        box-shadow: 5px 0 15px rgba(0,0,0,0.2);
    }
    .sidebar.show { left: 0; }

    .content-wrapper {
        width: 100%;
        display: flex;
        flex-direction: column;
        min-height: 100vh; /* Sửa lại để đảm bảo chiều cao */
    }
    .mobile-header {
        display: flex; align-items: center; justify-content: space-between;
        padding: 0 15px; height: 60px;
        background-color: var(--card-dark); border-bottom: 1px solid var(--border-color);
        flex-shrink: 0;
    }
    .page-header {
        display: flex; align-items: center; justify-content: space-between;
        padding: 0 15px; height: 60px;
        background-color: var(--card-dark); border-bottom: 1px solid var(--border-color);
        flex-shrink: 0;
    }
    .page-body { padding: 15px; }

    .mobile-overlay {
        position: fixed; top: 0; left: 0; width: 100%; height: 100%;
        background-color: rgba(0, 0, 0, 0.6);
        z-index: 1001;
    }
    .mobile-overlay.show { display: block; }

    /* --- GIAO DIỆN "GET LINK" MOBILE (ĐÃ SỬA LỖI) --- */
    .getlink-body {
        justify-content: flex-start;
        padding-top: 20px;
    }
    
    /* 1. Khung chứa để ẩn phần thừa */
    .supported-websites-wrapper {
        overflow: hidden;
        width: 100%;
        padding: 10px 0;
        margin-bottom: 20px;
    }

    /* 2. Danh sách trượt bên trong */
    .supported-websites {
        display: flex;
        width: max-content; /* Chiều rộng bằng tổng các item */
        animation: scroll-left 20s linear infinite; /* Tăng tốc độ */
    }
    .supported-websites:hover {
        animation-play-state: paused; /* Dừng lại khi di chuột vào */
    }

    .website-item {
        flex-shrink: 0;
        margin: 0 10px;
    }
    .options-buttons {
        display: flex;
        flex-wrap: wrap;
        gap: 5px;
    }
    /* 3. Định nghĩa animation */
    @keyframes scroll-left {
        0% { transform: translateX(0); }
        100% { transform: translateX(-50%); } /* Dừng lại khi 1 nửa đã trượt qua */
    }
    #plan-detail-modal.combo-modal .modal-content {
    display: flex;
    flex-direction: column;
    max-height: 95vh; /* Tăng chiều cao tối đa một chút /
    overflow-y: hidden; / Ẩn thanh cuộn */
    }
    
    #plan-detail-modal.combo-modal .modal-header h2 {
    font-size: 1.5rem; /* Giảm kích thước tiêu đề */
    margin-bottom: 5px;
    }
    
    #plan-detail-modal.combo-modal .combo-logo-wrapper {
    display: grid;
    grid-template-columns: repeat(6, 1fr); /* 6 cột /
    gap: 5px; / Giảm khoảng cách giữa các logo */
    padding: 10px;
    margin-bottom: 10px;
    }
    
    #plan-detail-modal.combo-modal .combo-logo {
    width: 100%;
    height: auto; /* Giữ tỷ lệ khung hình */
    }
    
    #plan-detail-modal.combo-modal .combo-details ul {
    padding-left: 15px;
    margin-bottom: 10px;
    }
    
    #plan-detail-modal.combo-modal .combo-details li {
    font-size: 0.9rem; /* Giảm kích thước chữ chi tiết */
    margin-bottom: 3px;
    }
    
    #plan-detail-modal.combo-modal .modal-body {
    overflow-y: auto; /* Vẫn cho phép cuộn nếu thực sự cần thiết /
    padding: 10px; / Giảm padding thân modal /
    display: flex;
    flex-direction: column;
    height: auto; / Chiều cao tự động */
    }
    
    #plan-detail-modal.combo-modal .options-wrapper {
    padding: 10px;
    }
    
    #plan-detail-modal.combo-modal .options-title {
    font-size: 1rem; /* Giảm kích thước tiêu đề tùy chọn */
    margin-bottom: 5px;
    }
    
    #plan-detail-modal.combo-modal .options-group button {
    padding: 8px 12px; /* Giảm padding nút tùy chọn */
    font-size: 0.9rem;
    margin-right: 5px;
    margin-bottom: 5px;
    }
    
    #plan-detail-modal.combo-modal .summary-section {
    padding: 10px 15px; /* Giảm padding phần tóm tắt */
    font-size: 0.9rem;
    }
    
    #plan-detail-modal.combo-modal .summary-section .total-price {
    font-size: 1.1rem; /* Giữ kích thước giá tiền tương đối */
    }
    
    #plan-detail-modal.combo-modal .modal-footer .buy-button {
    padding: 10px 20px; /* Giảm padding nút mua */
    font-size: 1rem;
    }
}

.message {
    position: relative;
    padding-bottom: 20px; /* Thêm không gian cho timestamp */
    max-width: fit-content;
    display: flex;
}
.message-content-wrapper {
    display: flex;
    align-items: center;
    gap: 10px;
}
.message-content {
    background-color: var(--message-other-bg);
    padding: 10px 15px;
    border-radius: 18px;
}
.message.user .message-content {
    background-color: var(--message-user-bg);
}
.message-time {
    position: absolute;
    bottom: 1px;
    right: 1px;
    font-size: 0.75rem;
    color: var(--text-secondary);
}
.message.admin .message-time {
    left: 15px;
    right: auto;
}

.replied-message {
    background-color: rgb(18 24 38 / 0%);
    padding: 8px;
    border-radius: 6px;
    margin-bottom: 5px;
    border-left: 3px solid var(--primary-accent);
    text-align: left;
    max-width: 100%;
}
.replied-message .sender {
    font-size: 0.8rem;
    font-weight: bold;
    color: var(--primary-accent);
}
.replied-message .content {
    font-size: 0.9rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.reply-context {
    width: 100%;
    padding: 10px;
    background-color: var(--background-dark);
    border-radius: 8px;
    margin-bottom: 10px;
    border-left: 3px solid var(--primary-accent);
    display: flex;
    justify-content: space-between;
    align-items: center;
    text-align: left;
}
.reply-sender { font-weight: bold; font-size: 0.9rem; }
.reply-text { font-size: 0.9rem; color: var(--text-secondary); }


.input-area-wrapper {
    padding: 15px;
    background-color: var(--background-dark);
    border-top: 1px solid var(--border-color);
    flex-shrink: 0;
}
.input-area {
    display: flex;
    align-items: center;
    gap: 10px;
}
.input-area input {
    flex-grow: 1;
    padding: 12px 20px;
    border: none;
    background-color: var(--card-dark);
    border-radius: 22px;
    color: var(--text-light);
    font-size: 1rem;
}
.input-area input:focus { outline: none; box-shadow: 0 0 0 2px var(--primary-accent); }
.input-area button {
    width: 44px; height: 44px;
    padding: 0; border-radius: 50%;
    flex-shrink: 0;
}
.input-area button i { margin: 0; }

/* =================================================================== */
/* --- TÙY CHỈNH THANH TRƯỢT DỌC --- */
/* =================================================================== */

/* Áp dụng cho các khu vực có thể cuộn */
.messages, .sidebar, .page-body, .modal-body {
    /* --- Dành cho Firefox --- */
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) var(--background-dark);

    /* --- Dành cho Chrome, Edge, Safari --- */
}

/* Toàn bộ thanh trượt */
.messages::-webkit-scrollbar,
.sidebar::-webkit-scrollbar,
.page-body::-webkit-scrollbar,
.modal-body::-webkit-scrollbar {
    width: 8px; /* Độ rộng của thanh trượt */
}

/* Phần nền (track) của thanh trượt */
.messages::-webkit-scrollbar-track,
.sidebar::-webkit-scrollbar-track,
.page-body::-webkit-scrollbar-track,
.modal-body::-webkit-scrollbar-track {
    background: var(--background-dark); /* Màu nền */
}

/* Phần con trượt (thumb) */
.messages::-webkit-scrollbar-thumb,
.sidebar::-webkit-scrollbar-thumb,
.page-body::-webkit-scrollbar-thumb,
.modal-body::-webkit-scrollbar-thumb {
    background-color: var(--border-color); /* Màu của con trượt */
    border-radius: 4px; /* Bo tròn góc */
    border: 2px solid var(--background-dark); /* Tạo khoảng cách với nền */
}

/* Hiệu ứng khi di chuột vào con trượt */
.messages::-webkit-scrollbar-thumb:hover,
.sidebar::-webkit-scrollbar-thumb:hover,
.page-body::-webkit-scrollbar-thumb:hover,
.modal-body::-webkit-scrollbar-thumb:hover {
    background-color: var(--text-secondary);
}

/* Đảm bảo bảng luôn chiếm 100% chiều rộng */
table.dataTable {
    width: 100% !important;
}
.action-btn {
    white-space: nowrap; /* Ngăn các nút tự xuống dòng */
}

/* --- Style cho Trang Get Link --- */

.getlink-body {
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.getlink-container {
    width: 100%;
    max-width: 800px;
}

.getlink-title {
    font-size: 2.2rem;
    font-weight: bold;
    color: var(--primary-accent);
}

.getlink-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-top: 15px;
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.getlink-form {
    display: flex;
    gap: 10px;
}

#getlink-input {
    flex-grow: 1;
    padding: 15px 20px;
    border: 1px solid var(--border-color);
    background-color: var(--background-dark);
    border-radius: 8px;
    color: var(--text-light);
    font-size: 1rem;
}

#getlink-btn {
    padding: 15px 30px;
    flex-shrink: 0; /* Ngăn nút bị co lại */
}
/* --- Style cho Danh sách Website hỗ trợ --- */

.supported-websites {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 15px;
    margin-bottom: 40px;
}

.website-item {
    display: flex;
    align-items: center;
    gap: 8px;
    background-color: var(--card-dark);
    padding: 8px 12px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.website-item img {
    height: 24px;
    width: 24px;
    object-fit: contain;
}

.website-item span {
    font-weight: 500;
    color: var(--text-secondary);
}

.download-options-wrapper {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 20px;
}
.download-options-wrapper label {
    padding: 8px 15px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
}
.download-options-wrapper input[type="radio"] {
    margin-right: 8px;
}

/* --- Style cho Khu vực Thông báo Get Link --- */

#getlink-message {
    margin-top: 20px;
    padding: 15px;
    border-radius: 8px;
    border: 1px solid transparent;

    /* Mặc định ẩn */
    display: none;
}

#getlink-message.show {
    display: block; /* Hiện ra */
}

#getlink-message.success {
    background-color: rgba(40, 167, 69, 0.1);
    border-color: var(--status-green);
    color: var(--status-green);
}

#getlink-message.error {
    background-color: rgba(220, 53, 69, 0.1);
    border-color: var(--status-red);
    color: var(--status-red);
}

#getlink-message.processing {
    background-color: rgba(99, 102, 241, 0.1);
    border-color: var(--primary-accent);
    color: var(--primary-accent);
}

/* Nút tải xuống bên trong thông báo */
.result-download-btn {
    display: inline-block;
    margin-left: 10px;
    padding: 5px 12px;
    font-size: 0.9rem;
    text-decoration: none;
}

/* --- Style cho Hệ thống Thông báo Toast --- */
.toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 10px;
    align-items: flex-end;
}
.toast-notification {
    background-color: var(--card-dark);
    border-left: 4px solid var(--primary-accent);
    border-radius: 8px;
    padding: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
    display: flex;
    align-items: center;
    gap: 15px;
    width: 100%;
    max-width: 350px;
    opacity: 0;
    transform: translateX(100%);
    transition: all 0.4s ease;
}
.toast-notification.show {
    opacity: 1;
    transform: translateX(0);
}

/* --- Style cho Loading Spinner trong Toast --- */

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.toast-spinner {
    width: 24px;
    height: 24px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--primary-accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    flex-shrink: 0;
}

.toast-spinner-img {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}
.auth-subtitle {
    text-align: left;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.buy-button {
    position: relative;
    overflow: hidden;
}
.buy-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -75%;
    width: 50%;
    height: 100%;
    background: linear-gradient(
        120deg,
        rgba(255, 255, 255, 0.2) 0%,
        rgba(255, 255, 255, 0.5) 100%
    );
    transform: skewX(-20deg);
}
.buy-button:hover::before {
    animation: shine 0.8s forwards;
}

@keyframes shine {
    0% { left: -75%; }
    100% { left: 125%; }
}

.buy-button:hover {
    box-shadow: 0 0 12px var(--primary-accent), 0 0 24px rgba(106, 63, 246, 0.6);
}

/* Desktop: logo + text căn giữa tuyệt đối trong panel trái */
@media (min-width: 993px){
  .auth-promo-panel{
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
  }
  .auth-hero{
    margin: auto;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    max-width: 420px; /* tránh text quá dài */
  }
  .auth-promo-panel .auth-promo-image{
    height: clamp(64px, 7vw, 96px);
    width: auto;
    object-fit: contain;
    display: block;
    margin-bottom: 16px;
  }
  .auth-hero h2{
    font-size: 1.8rem;
    font-weight: 700;
    margin: 0;
  }
  .auth-hero p{
    font-size: 1rem;
    color: var(--text-secondary);
    margin: 0;
  }
}

/* Mobile: xếp dọc, form trước promo sau – đều căn giữa */
@media (max-width: 992px){
  .standalone-page .auth-layout{
    display: block;
    flex-direction: column;
    align-items: center;
    gap: 24px;
    width: 100%;
    padding: 16px;
  }

  .auth-form-panel{
    order: 1;
    width: 100%;
    display: flex;
    justify-content: center;
  }
  .auth-promo-panel{
    order: 2;
    width: 100%;
    display: flex;
    justify-content: center;
    text-align: center;
  }
  .auth-hero{
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
  }
  .auth-promo-panel .auth-promo-image{
    height: 64px;
    width: auto;
    margin-bottom: 12px;
  }
  .auth-hero h2{
    font-size: 1.5rem;
    margin: 0;
  }
  .auth-hero p{
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin: 0;
  }
}

/* --- CSS cho thông báo chat admin --- */
#chat-conversation-list li.unread {
    background-color: #eef5ff;
}
#chat-conversation-list li.unread .conv-item-name {
    font-weight: 700;
    color: #333;
}
.unread-badge {
    background-color: #e63946;
    color: white;
    font-size: 11px;
    font-weight: bold;
    padding: 2px 7px;
    border-radius: 10px;
    position: absolute;
    top: 50%;
    right: 15px;
    transform: translateY(-50%);
}
.load-more-container {
    padding: 15px;
    text-align: center;
    border-top: 1px solid var(--border-color);
}
/* Khung tin nhắn chung */
.message {
    display: flex;
    gap: 10px;
}

/* Avatar */
.message-avatar {
    width: 36px;
    height: 36px;
    min-width: 36px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    background: #e5e7eb;       /* xám nhạt */
    color: #374151;            /* xám đậm */
    overflow: hidden;
}

.message-avatar i { font-size: 16px; }

.message-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.replied-message .sender { font-weight: 600; margin-bottom: 2px; }
.replied-message .content { color: #97999b; font-size: 0.95em; }

/* Highlight khi nhảy tới tin gốc */
.message--highlight {
    animation: msgFlash 1.2s ease-out;
}
@keyframes msgFlash {
    0%   { box-shadow: 0 0 0 2px rgba(99,102,241,0.5) inset; background: rgba(99,102,241,0.08); }
    100% { box-shadow: 0 0 0 0 transparent; background: transparent; }
}

/* (Nếu chưa có) bố cục avatar + body */
.message { display: flex; align-items: flex-end; gap: 10px; margin-bottom: 10px; }
.message-avatar {
    width: 36px; height: 36px; min-width: 36px; border-radius: 50%;
    display: grid; place-items: center; background: #e5e7eb; color: #374151; overflow: hidden;
}
.message-avatar i { font-size: 16px; }
.message-body { display: flex; flex-direction: column; gap: 6px; }

/* Định dạng cho các URL trong tin nhắn */
.message-content a {
    color: #87CEEB; /* Màu xanh da trời sáng */
    text-decoration: underline;
    font-weight: 600;
}

.message-content a:hover {
    text-decoration: none;
}

/* Đối với tin nhắn của mình (nền xanh), link sẽ có màu trắng */
.message.user .message-content a,
.message.admin .message-content a {
    color: #FFFFFF;
}

.chat-image {
    max-width: 250px;
    max-height: 250px;
    border-radius: 8px;
    cursor: pointer;
    margin: 5px;
}
.attach-button {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0 10px;
}

.image-preview-wrapper {
    padding: 0 15px 10px 15px;
}
.image-preview-box {
    position: relative;
    display: inline-block;
}
#image-preview {
    max-width: 120px;
    max-height: 120px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}
.remove-preview-button {
    position: absolute;
    top: -8px;
    right: -8px;
    background-color: rgba(0, 0, 0, 0.7);
    color: white;
    border: none;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
}

/* public/css/style.css */

/* --- CSS cho Lightbox xem ảnh --- */
.lightbox-overlay {
    position: fixed;
    z-index: 9999;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.85);
    display: flex;
    justify-content: center;
    align-items: center;
}

.lightbox-content {
    max-width: 90%;
    max-height: 90%;
    object-fit: contain;
}

.lightbox-close {
    position: absolute;
    top: 20px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    transition: 0.3s;
    cursor: pointer;
}

.lightbox-close:hover {
    color: #bbb;
}

/* Thêm con trỏ phóng to cho ảnh trong chat */
.chat-image {
    cursor: zoom-in;
}

/* Chỉ áp cho khu vực chat admin để không ảnh hưởng UI khác */
#chat-message-container .message {
  display: flex;
  gap: 10px;
  margin: 8px 0;
}

/* Tin đến từ USER (incoming) => bên trái */
#chat-message-container .message.incoming {
  justify-content: flex-start;
  flex-direction: row;          /* avatar bên trái, bubble bên phải */
}

/* Tin của ADMIN (outgoing) => bên phải */
#chat-message-container .message.outgoing {
  justify-content: flex-end;
  flex-direction: row-reverse;  /* avatar bên phải, bubble bên trái */
}

/* (tuỳ chọn) chỉnh bo góc để nhìn đúng hướng */
#chat-message-container .message.incoming .message-bubble { border-radius: 16px 16px 16px 6px; }
#chat-message-container .message.outgoing .message-bubble { border-radius: 16px 16px 6px 16px; }
.page-content {
    position: relative;
}
/* Kiểu cho nút cuộn xuống */
.scroll-to-bottom-button {
    position: absolute;
    bottom: 120px; /* Điều chỉnh khoảng cách với ô nhập liệu */
    right: 30px; /* Điều chỉnh khoảng cách với lề phải */
    z-index: 100;

    width: 40px;
    height: 40px;
    background-color: var(--card-light);
    color: var(--text-light);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    
    display: flex;
    align-items: center;
    justify-content: center;
    
    font-size: 16px;
    cursor: pointer;
    opacity: 0.8;
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.scroll-to-bottom-button:hover {
    opacity: 1;
    transform: scale(1.1);
}

/* --- Button --- */
.redownload-button, .save-btn, .action-btn {
    background-color: var(--primary-accent);
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.2s;
}

.redownload-button {
    position: relative;
    overflow: hidden;
}
.redownload-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -75%;
    width: 50%;
    height: 100%;
    transform: skewX(-20deg);
}

.redownload-button:hover {
    box-shadow: 0 0 12px var(--primary-accent), 0 0 24px rgba(106, 63, 246, 0.6);
}
.status-failed {
    color: #f44336; /* Màu đỏ */
    font-weight: bold;
}
/* --- CSS cho trang Hướng dẫn --- */
.guide-section {
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.guide-section:last-child {
    border-bottom: none;
}

.guide-section h3 {
    font-size: 1.5rem;
    color: var(--primary-accent);
    margin-bottom: 15px;
}

.guide-section p,
.guide-section li {
    line-height: 1.8;
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.guide-section ol,
.guide-section ul {
    padding-left: 30px;
    margin-top: 15px;
}

.guide-section img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    margin-top: 20px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

/* --- CSS cho mục FAQ Accordion --- */
.faq-item {
    border-bottom: 1px solid var(--border-color);
}

.faq-question {
    width: 100%;
    background: none;
    border: none;
    padding: 20px 15px;
    
    display: flex;
    justify-content: space-between;
    align-items: center;
    
    text-align: left;
    font-size: 1.2rem;
    color: var(--text-light);
    cursor: pointer;
}

.faq-question:hover {
    background-color: var(--card-dark);
}

.faq-question i {
    transition: transform 0.3s ease;
    color: var(--primary-accent);
}

.faq-answer {
    padding: 0 20px 20px 20px;
    background-color: var(--card-dark);
    display: none; /* Mặc định ẩn câu trả lời */
}

/* Khi một item được active, xoay icon */
.faq-item.active .faq-question i {
    transform: rotate(180deg);
}