/* ========================================================
   Z-INDEX SCALE — Centralized Layer Management
   Synced with Bootstrap 5 / Tabler UI defaults.
   Rule: NEVER hard-code z-index values elsewhere.
         Always reference these variables via var().
======================================================== */
:root {
    --z-underlay: -1;            /* Background layers */
    --z-normal: 1;               /* Default content */
    --z-sidebar: 10;             /* Admin sidebar */
    --z-header: 100;             /* Sticky header */
    --z-dropdown: 1000;          /* Dropdown menus */
    --z-sticky: 1020;            /* position: sticky elements */
    --z-fixed: 1030;             /* position: fixed elements */
    --z-modal-backdrop: 1040;    /* Modal backdrop overlay */
    --z-modal: 1050;             /* Modal dialog */
    --z-popover: 1060;           /* Popovers */
    --z-tooltip: 1070;           /* Tooltips */
    --z-select2: 1080;           /* Select2 dropdown (above modal) */
    --z-toast: 1090;             /* Toast notifications */
    --z-loader: 9999;            /* Full-screen loader */
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-body);
    color: var(--text-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: var(--transition);
}

a:hover {
    color: var(--primary-hover);
}

/* ========================================================
   UI COMPONENT KIT
======================================================== */

/* 1. BUTTONS */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--border-radius-md);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    line-height: 1.5;
}

.btn-primary {
    background-color: var(--primary-color);
    color: #fff;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 6px rgba(30, 58, 138, 0.2);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border: 1px solid var(--border-color);
}

.btn-outline:hover {
    background-color: rgba(30, 58, 138, 0.05);
    border-color: var(--primary-color);
}

.btn-icon-only {
    padding: 0.5rem;
    border-radius: var(--border-radius-md);
    border: 1px solid transparent;
    background: transparent;
    color: var(--text-main);
}
.btn-icon-only:hover {
    background: rgba(0,0,0,0.05);
}

/* 2. BADGES */
.badge {
    display: inline-block;
    padding: 0.3rem 0.6rem;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--border-radius-sm);
    color: #fff;
    line-height: 1.2;
}

.badge-danger { background-color: var(--danger); }
.badge-success { background-color: var(--success); }
.badge-muted { background-color: var(--text-muted); }

/* 3. INPUT FORMS & SEARCH */
.form-group {
    margin-bottom: 1rem;
}

.form-label {
    display: block;
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 0.375rem;
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    background-color: #fff;
    color: var(--text-main);
    border-radius: var(--border-radius-sm);
    outline: none;
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}

/* Biến thể ô search tròn mềm */
.search-input-wrapper {
    position: relative;
    width: 250px;
}
.search-input-wrapper i {
    position: absolute;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}
.search-input-wrapper input {
    padding-left: 35px;
    background-color: #F3F4F6;
    border: 1px solid transparent;
    border-radius: 20px;
}
.search-input-wrapper input:focus {
    background-color: #fff;
    border-color: var(--primary-color);
}

/* 4. MODAL POPUP */
.modal {
    display: none; /* Ẩn đi mặc định */
    position: fixed;
    z-index: var(--z-modal-backdrop);
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(2px);
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal.show {
    display: flex;
    opacity: 1;
}

.modal-content {
    background-color: var(--bg-surface);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 500px;
    transform: translateY(-20px);
    transition: transform 0.3s ease;
}

.modal.show .modal-content {
    transform: translateY(0);
}

.modal-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    margin: 0;
    font-size: 1.125rem;
    font-weight: 600;
}

.close-btn {
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: var(--text-muted);
    line-height: 1;
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
}

/* Auth Login Layout overrides */
.login-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--bg-body);
}

.login-card {
    background-color: var(--bg-surface);
    padding: 2rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow);
    width: 100%;
    max-width: 400px;
}

/* 5. MODAL VARIANTS */
/* Modal rộng cho form phức tạp */
.modal-lg .modal-content {
    max-width: 700px;
}
.modal-lg .modal-body {
    max-height: 75vh;
    overflow-y: auto;
    scrollbar-width: thin;
}

/* 6. ENHANCED FORM (dùng trong modal) */
/* Hàng 2 cột */
.form-row {
    display: flex;
    gap: 1rem;
}
.form-row > * {
    flex: 1;
    min-width: 0; /* tránh overflow */
}

/* Section divider */
.form-section {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin: 1.25rem 0 1rem;
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.form-section::after {
    content: '';
    flex: 1;
    height: 1px;
    background-color: var(--border-color);
}
.form-section i {
    font-size: 0.875rem;
    color: var(--primary-color);
}

/* Product Info Card — hiện khi chọn sản phẩm */
.product-info-card {
    display: none; /* JS sẽ toggle */
    background: linear-gradient(135deg, rgba(30, 58, 138, 0.04), rgba(30, 58, 138, 0.08));
    border: 1px solid rgba(30, 58, 138, 0.15);
    border-radius: var(--border-radius-md);
    padding: 0.875rem 1rem;
    margin-top: 0.5rem;
    animation: slideDown 0.25s ease-out;
}
.product-info-card.show {
    display: block;
}
@keyframes slideDown {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}
.product-info-card .product-info-name {
    font-weight: 600;
    font-size: 0.9375rem;
    color: var(--text-main);
    margin-bottom: 0.375rem;
}
.product-info-card .product-info-meta {
    display: flex;
    gap: 1.25rem;
    font-size: 0.8125rem;
    color: var(--text-muted);
}
.product-info-card .product-info-meta span {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}
.product-info-card .product-info-meta i {
    font-size: 0.75rem;
}

/* Live Total */
.live-total-bar {
    background-color: #F8FAFC;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 0.875rem 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 1rem 0;
}
.live-total-bar .total-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-muted);
}
.live-total-bar .total-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    transition: var(--transition);
}
.live-total-bar .total-value.pulse {
    animation: pulseBrief 0.3s ease;
}
@keyframes pulseBrief {
    0% { transform: scale(1); }
    50% { transform: scale(1.08); }
    100% { transform: scale(1); }
}