/**
 * ====================================================
 * HOÀNG - HỆ THỐNG QUẢN LÝ MÃ KHÓA
 * Phong cách giao diện Nền tối Hiện đại & Cao cấp
 * ====================================================
 */

:root {
    --bg-dark: #090d16;
    --bg-card: rgba(17, 24, 39, 0.75);
    --bg-card-hover: rgba(31, 41, 55, 0.85);
    --bg-sidebar: rgba(15, 23, 42, 0.95);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-glow: rgba(99, 102, 241, 0.4);
    
    --primary-gradient: linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #2563eb 100%);
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --info-color: #06b6d4;
    
    --text-main: #f3f4f6;
    --text-muted: #9ca3af;
    --text-dim: #6b7280;
    
    --sidebar-width: 260px;
    --header-height: 64px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    
    --shadow-soft: 0 10px 25px -5px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.25);
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Toàn trang */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-dark);
    background-image: 
        radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(124, 58, 237, 0.15) 0px, transparent 50%);
    background-attachment: fixed;
    color: var(--text-main);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* Định dạng liên kết */
a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: #818cf8;
}

/* Thanh cuộn tùy chỉnh */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.2);
}
::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* ====================================================
   TRANG ĐĂNG NHẬP
   ==================================================== */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-card {
    width: 100%;
    max-width: 440px;
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 36px 30px;
    box-shadow: var(--shadow-soft), var(--shadow-glow);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.login-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-gradient);
}

.brand-header {
    margin-bottom: 28px;
}

.brand-logo-text {
    font-size: 32px;
    font-weight: 800;
    letter-spacing: 2px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
    margin-bottom: 4px;
}

.brand-sub-text {
    font-size: 13px;
    color: var(--text-muted);
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.login-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 6px;
}

.login-desc {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 24px;
}

/* Ô nhập liệu Form */
.form-group {
    margin-bottom: 20px;
    text-align: left;
}

.form-label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-main);
    margin-bottom: 8px;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.form-control {
    width: 100%;
    height: 46px;
    padding: 10px 14px;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-main);
    font-size: 14px;
    transition: var(--transition);
    outline: none;
}

.input-with-icon {
    padding-right: 44px;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
    background: rgba(15, 23, 42, 0.9);
}

.toggle-password-btn {
    position: absolute;
    right: 12px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.toggle-password-btn:hover {
    color: var(--text-main);
}

/* Nút bấm (Buttons) */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    padding: 10px 18px;
    font-size: 14px;
    min-height: 44px;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background: var(--primary-gradient);
    color: #ffffff;
    box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.6);
    filter: brightness(1.08);
    color: #ffffff;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-main);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.14);
    color: #ffffff;
}

.btn-success {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: #ffffff;
}

.btn-success:hover {
    filter: brightness(1.1);
}

.btn-danger {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    color: #ffffff;
}

.btn-danger:hover {
    filter: brightness(1.1);
}

.btn-warning {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    color: #ffffff;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
    min-height: 32px;
    border-radius: var(--radius-sm);
}

.btn-block {
    width: 100%;
}

/* Thông báo cảnh báo (Alert) */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 10px;
    text-align: left;
}

.alert-danger {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #fca5a5;
}

.alert-success {
    background: rgba(16, 185, 129, 0.15);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: #6ee7b7;
}

.alert-info {
    background: rgba(6, 182, 212, 0.15);
    border: 1px solid rgba(6, 182, 212, 0.3);
    color: #67e8f9;
}

/* ====================================================
   BỐ CỤC CHÍNH (LAYOUT: SIDEBAR + MAIN)
   ==================================================== */
.app-wrapper {
    display: flex;
    min-height: 100vh;
}

/* Sidebar bên trái */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.sidebar-header {
    height: var(--header-height);
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-brand {
    display: flex;
    flex-direction: column;
}

.sidebar-brand-name {
    font-size: 22px;
    font-weight: 800;
    letter-spacing: 1.5px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.sidebar-brand-sub {
    font-size: 11px;
    color: var(--text-muted);
    letter-spacing: 0.5px;
}

.sidebar-close-btn {
    display: none;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 22px;
    cursor: pointer;
}

.sidebar-nav {
    flex: 1;
    padding: 20px 12px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.nav-link svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.nav-link:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.05);
}

.nav-link.active {
    color: #ffffff;
    background: var(--primary-gradient);
    font-weight: 600;
    box-shadow: 0 4px 14px rgba(99, 102, 241, 0.35);
}

.sidebar-footer {
    padding: 16px 12px;
    border-top: 1px solid var(--border-color);
}

.nav-link-logout {
    color: #f87171;
}

.nav-link-logout:hover {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
}

/* Nền mờ phủ khi mở Sidebar trên Mobile */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 999;
}

/* Khu vực nội dung chính */
.main-wrapper {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    width: calc(100% - var(--sidebar-width));
}

/* Header trên cùng */
.top-header {
    height: var(--header-height);
    background: rgba(15, 23, 42, 0.7);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    position: sticky;
    top: 0;
    z-index: 900;
}

.mobile-toggle-btn {
    display: none;
    background: transparent;
    border: none;
    color: var(--text-main);
    font-size: 24px;
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-sm);
}

.mobile-brand-name {
    display: none;
    font-size: 20px;
    font-weight: 800;
    letter-spacing: 1.5px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header-user-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-badge {
    background: rgba(99, 102, 241, 0.15);
    border: 1px solid rgba(99, 102, 241, 0.3);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
    color: #a5b4fc;
}

/* Nội dung trang */
.content-body {
    flex: 1;
    padding: 24px;
}

/* Tiêu đề trang */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 16px;
}

.page-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-main);
}

.page-subtitle {
    font-size: 14px;
    color: var(--text-muted);
    margin-top: 4px;
}

/* ====================================================
   THẺ THỐNG KÊ (CARDS)
   ==================================================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 18px;
    margin-bottom: 28px;
}

.stat-card {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 20px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.stat-card:hover {
    transform: translateY(-3px);
    border-color: var(--border-glow);
    box-shadow: var(--shadow-soft), var(--shadow-glow);
    background: var(--bg-card-hover);
}

.stat-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.stat-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.stat-icon-purple {
    background: rgba(124, 58, 237, 0.15);
    color: #a78bfa;
}

.stat-icon-blue {
    background: rgba(37, 99, 235, 0.15);
    color: #60a5fa;
}

.stat-icon-green {
    background: rgba(16, 185, 129, 0.15);
    color: #34d399;
}

.stat-icon-red {
    background: rgba(239, 68, 68, 0.15);
    color: #f87171;
}

.stat-icon-amber {
    background: rgba(245, 158, 11, 0.15);
    color: #fbbf24;
}

.stat-value {
    font-size: 28px;
    font-weight: 800;
    color: var(--text-main);
    line-height: 1;
    margin-bottom: 6px;
}

.stat-label {
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 500;
}

/* ====================================================
   BẢNG DỮ LIỆU HIỆN ĐẠI (TABLES)
   ==================================================== */
.card-box {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-soft);
}

.card-box-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 12px;
}

.card-box-title {
    font-size: 17px;
    font-weight: 600;
    color: var(--text-main);
}

.table-responsive {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.custom-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    font-size: 13px;
    text-align: left;
}

.custom-table th {
    background: rgba(15, 23, 42, 0.8);
    color: var(--text-muted);
    font-weight: 600;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    white-space: nowrap;
}

.custom-table td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-main);
    vertical-align: middle;
}

.custom-table tbody tr {
    transition: var(--transition);
}

.custom-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.03);
}

/* Thẻ trạng thái (Status Badges) */
.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    border-radius: 14px;
    font-size: 12px;
    font-weight: 600;
    white-space: nowrap;
}

.badge-unused {
    background: rgba(59, 130, 246, 0.15);
    color: #93c5fd;
    border: 1px solid rgba(59, 130, 246, 0.3);
}

.badge-active {
    background: rgba(16, 185, 129, 0.15);
    color: #6ee7b7;
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge-expired {
    background: rgba(245, 158, 11, 0.15);
    color: #fcd34d;
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.badge-banned {
    background: rgba(239, 68, 68, 0.15);
    color: #fca5a5;
    border: 1px solid rgba(239, 68, 68, 0.3);
}

/* Mã khóa hiển thị to, đẹp */
.key-code-display {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-weight: 700;
    letter-spacing: 1px;
    color: #a5b4fc;
    background: rgba(99, 102, 241, 0.1);
    padding: 4px 8px;
    border-radius: 6px;
    display: inline-block;
}

.big-key-box {
    background: rgba(15, 23, 42, 0.8);
    border: 2px dashed rgba(99, 102, 241, 0.5);
    border-radius: var(--radius-lg);
    padding: 24px;
    text-align: center;
    margin: 20px 0;
}

.big-key-text {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 26px;
    font-weight: 800;
    letter-spacing: 2px;
    color: #818cf8;
    word-break: break-all;
    margin-bottom: 14px;
}

/* Đếm ngược thời gian */
.countdown-timer {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 13px;
    color: #34d399;
    font-weight: 600;
}

/* ====================================================
   MODAL HỘP THOẠI HIỆN ĐẠI
   ==================================================== */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    padding: 16px;
}

.modal-overlay.active {
    display: flex;
}

.modal-card {
    background: #111827;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 480px;
    padding: 28px;
    box-shadow: var(--shadow-soft), var(--shadow-glow);
    position: relative;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

.modal-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-main);
}

.modal-close-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 22px;
    cursor: pointer;
    line-height: 1;
}

.modal-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 24px;
}

/* Thông báo Toast */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 10px;
    pointer-events: none;
}

.toast {
    background: rgba(17, 24, 39, 0.95);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(16px);
    color: var(--text-main);
    padding: 12px 20px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-soft);
    font-size: 14px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: var(--transition);
    pointer-events: auto;
    animation: toastIn 0.3s ease;
}

@keyframes toastIn {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

/* ====================================================
   RESPONSIVE DESIGN (ƯU TIÊN ĐIỆN THOẠI)
   ==================================================== */
@media (max-width: 991px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar-overlay.active {
        display: block;
    }

    .sidebar-close-btn {
        display: block;
    }

    .main-wrapper {
        margin-left: 0;
        width: 100%;
    }

    .mobile-toggle-btn {
        display: block;
    }

    .mobile-brand-name {
        display: block;
    }

    .top-header {
        padding: 0 16px;
    }

    .content-body {
        padding: 16px;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .big-key-text {
        font-size: 20px;
    }

    .card-box {
        padding: 16px;
    }

    .btn {
        width: 100%;
    }

    .btn-sm {
        width: auto;
    }

    .action-group {
        display: flex;
        flex-wrap: wrap;
        gap: 6px;
    }
}