/* ============================================================
   БАЗОВЫЕ ПЕРЕМЕННЫЕ — Bootstrap 5 / Nunito design system
   ============================================================ */
@import url('https://fonts.googleapis.com/css2?family=Nunito:ital,wght@0,400;0,600;0,700;0,800;1,400&display=swap');

:root {
    --bs-body-font-family: 'Nunito', sans-serif;
    --bs-body-font-size: .9rem;
    --bs-body-line-height: 1.6;
    --bs-body-color: #212529;
    --bs-body-bg: #f8fafc;

    --bs-primary: #0d6efd;
    --bs-primary-rgb: 13, 110, 253;
    --bs-primary-bg-subtle: #cfe2ff;
    --bs-border-color: #dee2e6;
    --bs-border-radius: .375rem;

    --bg-main: #f8fafc;
    --panel-bg: #ffffff;
    --accent: #0d6efd;
    --accent-hover: #0a58ca;
    --text-main: #212529;
    --text-muted: #6c757d;
    --border-color: #dee2e6;
    --success: #198754;
    --danger: #dc3545;
    --warning: #ffc107;
    --shadow-sm: 0 .125rem .25rem rgba(0,0,0,.075);
    --shadow: 0 .5rem 1rem rgba(0,0,0,.15);
}

/* ============================================================
   RESET & BASE
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; }

body {
    margin: 0;
    font-family: var(--bs-body-font-family);
    font-size: var(--bs-body-font-size);
    font-weight: 400;
    line-height: var(--bs-body-line-height);
    color: var(--text-main);
    background-color: var(--bg-main);
    -webkit-text-size-adjust: 100%;
}

/* ============================================================
   LAYOUT
   ============================================================ */
.container {
    max-width: 100%;
    width: 100%;
    margin: 0 auto;
    padding: 1rem 1.5rem;
}

/* ============================================================
   TYPOGRAPHY
   ============================================================ */
h1, .h1 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-main);
    line-height: 1.2;
}

h2, .h2 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: .75rem;
    color: var(--text-main);
}

h3, .h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: .5rem;
}

p { margin-top: 0; margin-bottom: 1rem; }

/* ============================================================
   NAVIGATION BAR (top bar like reference site)
   ============================================================ */
.navbar, nav.top-nav {
    background-color: #212529 !important;
    padding: .4rem 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.navbar a, nav.top-nav a {
    color: rgba(255,255,255,.75);
    text-decoration: none;
    font-size: .875rem;
    padding: .25rem .5rem;
    border-radius: .25rem;
    transition: color .15s;
}

.navbar a:hover, nav.top-nav a:hover,
.navbar a.active, nav.top-nav a.active {
    color: #fff;
}

.navbar-brand {
    font-size: 1rem;
    font-weight: 700;
    color: #fff !important;
    margin-right: 1rem;
}

/* ============================================================
   PAGE HEADER ROW (title + action buttons)
   ============================================================ */
.page-header-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: .5rem;
    margin-bottom: 1rem;
}

.page-header-actions {
    display: flex;
    align-items: center;
    gap: .5rem;
    flex-wrap: wrap;
    justify-content: flex-end;
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .35rem;
    padding: .375rem .75rem;
    font-family: var(--bs-body-font-family);
    font-size: .9rem;
    font-weight: 400;
    line-height: 1.6;
    text-align: center;
    text-decoration: none;
    cursor: pointer;
    border: 1px solid transparent;
    border-radius: var(--bs-border-radius);
    transition: color .15s ease-in-out, background-color .15s ease-in-out, border-color .15s ease-in-out;
    white-space: nowrap;
}

.btn-primary, .btn-add {
    background-color: var(--accent);
    border-color: var(--accent);
    color: #fff;
}
.btn-primary:hover, .btn-add:hover {
    background-color: var(--accent-hover);
    border-color: var(--accent-hover);
    color: #fff;
}

.btn-success {
    background-color: #198754;
    border-color: #198754;
    color: #fff;
}
.btn-success:hover {
    background-color: #157347;
    border-color: #146c43;
    color: #fff;
}

.btn-secondary, .btn-back {
    background-color: #6c757d;
    border-color: #6c757d;
    color: #fff;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
}
.btn-secondary:hover, .btn-back:hover {
    background-color: #5c636a;
    border-color: #565e64;
    color: #fff;
}

.btn-danger, .btn-delete {
    background-color: transparent;
    border-color: var(--danger);
    color: var(--danger);
    font-size: .85rem;
    padding: .25rem .6rem;
}
.btn-danger:hover, .btn-delete:hover {
    background-color: var(--danger);
    color: #fff;
}

.btn-outline-secondary {
    background-color: transparent;
    border-color: #6c757d;
    color: #6c757d;
}
.btn-outline-secondary:hover {
    background-color: #6c757d;
    color: #fff;
}

.btn-sm {
    padding: .25rem .5rem;
    font-size: .7875rem;
    border-radius: .25rem;
}

.btn-lg {
    padding: .5rem 1rem;
    font-size: 1.125rem;
    border-radius: .5rem;
}

.import-btn {
    background: #fff;
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: .375rem .75rem;
    border-radius: var(--bs-border-radius);
    cursor: pointer;
    font-size: .875rem;
    display: inline-flex;
    align-items: center;
    gap: .35rem;
    text-decoration: none;
}
.import-btn:hover {
    background: #f8f9fa;
    border-color: #adb5bd;
}

/* ============================================================
   FORMS
   ============================================================ */
.form-group { margin-bottom: 1rem; }

label {
    display: inline-block;
    margin-bottom: .5rem;
    font-size: .875rem;
    color: var(--text-muted);
    text-align: right;
    padding-right: .75rem;
}

input, textarea, select {
    display: block;
    width: 100%;
    padding: .375rem .75rem;
    font-size: .9rem;
    font-family: var(--bs-body-font-family);
    line-height: 1.6;
    color: var(--text-main);
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--bs-border-radius);
    transition: border-color .15s ease-in-out, box-shadow .15s ease-in-out;
    appearance: none;
}

input:focus, textarea:focus, select:focus {
    outline: 0;
    border-color: #86b7fe;
    background-color: #fff;
    box-shadow: 0 0 0 .25rem rgba(13,110,253,.25);
}

input:disabled, textarea:disabled, select:disabled {
    background-color: #e9ecef;
    opacity: 1;
}

textarea { resize: vertical; }

/* Detail card form layout — two columns like reference */
.form-row-detail {
    display: grid;
    grid-template-columns: 200px 1fr;
    align-items: center;
    gap: .25rem .5rem;
    margin-bottom: .375rem;
}

.form-row-detail label {
    text-align: right;
    color: var(--text-muted);
    font-size: .875rem;
    margin-bottom: 0;
    padding-right: .75rem;
}

/* ============================================================
   ALERTS / FLASH MESSAGES
   ============================================================ */
.alert {
    padding: .75rem 1rem;
    border-radius: var(--bs-border-radius);
    margin-bottom: .75rem;
    font-weight: 500;
    border: 1px solid transparent;
    font-size: .875rem;
}
.alert-success  { background: #d1e7dd; border-color: #a3cfbb; color: #0a3622; }
.alert-error,
.alert-danger   { background: #f8d7da; border-color: #f1aeb5; color: #58151c; }
.alert-warning  { background: #fff3cd; border-color: #ffe69c; color: #664d03; }
.alert-info     { background: #cff4fc; border-color: #9eeaf9; color: #055160; }

/* ============================================================
   TABLE — main data table
   ============================================================ */
.items-list, .js-main-table-scroll {
    background: var(--panel-bg);
    border-radius: var(--bs-border-radius);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.items-table, .table {
    width: 100%;
    border-collapse: collapse;
    font-size: .8rem;
    margin-bottom: 0;
    color: var(--text-main);
}

.items-table thead th,
.table thead th,
.table tr th {
    background-color: var(--bs-primary-bg-subtle);
    color: var(--text-muted);
    font-weight: 600;
    font-size: .75rem;
    text-transform: none;
    letter-spacing: 0;
    padding: .5rem .75rem;
    text-align: left;
    border-bottom: 2px solid var(--border-color);
    border-right: 1px solid #d7d7d7;
    position: sticky;
    top: 0;
    z-index: 3;
    white-space: nowrap;
    vertical-align: middle;
}

.items-table thead th:last-child,
.table thead th:last-child { border-right: none; }

.items-table td,
.table td {
    padding: .5rem .75rem;
    border-bottom: 1px solid var(--border-color);
    font-size: .8rem;
    vertical-align: middle;
    cursor: pointer;
    word-break: break-word;
}

.items-table tr:last-child td,
.table tr:last-child td { border-bottom: none; }

.items-table tbody tr:hover td,
.table-interactive tbody tr:hover > td {
    background-color: #f2f7ff;
}

.table-interactive tbody tr {
    transition: background-color .12s ease-in-out;
}

.table-interactive tbody tr.is-selected > td { background-color: #dbe7ff; }
.table-interactive tbody tr.is-selected:hover > td { background-color: #cfe0ff; }

/* ============================================================
   DETAIL CARD — characteristics-box, info-table, materials-box
   ============================================================ */
.characteristics-box,
.materials-box,
.add-materials-box,
.add-relation-box,
.items-list-box {
    background: var(--panel-bg);
    padding: 1.25rem 1.5rem;
    border-radius: var(--bs-border-radius);
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.info-table {
    width: 100%;
    border-collapse: collapse;
}

.info-table th,
.info-table td {
    padding: .5rem .75rem;
    text-align: left;
    border-bottom: 1px solid #f0f0f0;
    font-size: .875rem;
    vertical-align: top;
}

.info-table th {
    width: 200px;
    background-color: transparent;
    color: var(--text-muted);
    font-weight: 400;
    text-align: right;
    padding-right: 1rem;
    white-space: nowrap;
}

.info-table tr:last-child th,
.info-table tr:last-child td { border-bottom: none; }

/* Sub-table inside detail cards */
.materials-table {
    width: 100%;
    border-collapse: collapse;
    font-size: .85rem;
}
.materials-table th {
    background-color: var(--bs-primary-bg-subtle);
    padding: .4rem .75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
    font-size: .75rem;
    color: var(--text-muted);
}
.materials-table td {
    padding: .4rem .75rem;
    border-bottom: 1px solid #f0f0f0;
    vertical-align: middle;
}
.materials-table tr:last-child td { border-bottom: none; }
.materials-table tbody tr:hover td { background-color: #f2f7ff; }

/* ============================================================
   STATUS BADGES
   ============================================================ */
.badge {
    display: inline-block;
    padding: .35em .65em;
    font-size: .75em;
    font-weight: 700;
    line-height: 1;
    text-align: center;
    white-space: nowrap;
    vertical-align: baseline;
    border-radius: var(--bs-border-radius);
}
.badge-primary   { background: #cfe2ff; color: #084298; }
.badge-success   { background: #d1e7dd; color: #0a3622; }
.badge-warning   { background: #fff3cd; color: #664d03; }
.badge-danger    { background: #f8d7da; color: #58151c; }
.badge-secondary { background: #e9ecef; color: #495057; }
.badge-info      { background: #cff4fc; color: #055160; }

/* ============================================================
   SEARCH BOX
   ============================================================ */
.search-box {
    position: relative;
    margin: .75rem 0;
    padding: .75rem;
    background: #f8f9fa;
    border-radius: var(--bs-border-radius);
    border: 1px solid var(--border-color);
}

.search-wrapper {
    display: flex;
    gap: .5rem;
    align-items: center;
    flex-wrap: wrap;
}

.search-input-container {
    flex: 1;
    position: relative;
    min-width: 200px;
}

.search-input {
    width: 100%;
    padding: .375rem .75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--bs-border-radius);
    font-size: .9rem;
    transition: border-color .15s ease-in-out, box-shadow .15s ease-in-out;
    background-color: #fff;
    font-family: var(--bs-body-font-family);
}

.search-input:focus {
    outline: 0;
    border-color: #86b7fe;
    box-shadow: 0 0 0 .25rem rgba(13,110,253,.25);
}

.search-buttons { display: flex; gap: .5rem; align-items: center; }

.btn-search {
    background: var(--accent);
    color: #fff;
    padding: .375rem .75rem;
    border: none;
    border-radius: var(--bs-border-radius);
    cursor: pointer;
    font-size: .9rem;
    font-family: var(--bs-body-font-family);
}
.btn-search:hover { background: var(--accent-hover); }

.btn-clear {
    background: #6c757d;
    color: #fff;
    padding: .375rem .75rem;
    text-decoration: none;
    border-radius: var(--bs-border-radius);
    font-size: .9rem;
    display: inline-flex;
    align-items: center;
}
.btn-clear:hover { background: #5c636a; color: #fff; }

/* Live search results dropdown */
.search-results {
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    right: 0;
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--bs-border-radius);
    box-shadow: var(--shadow);
    z-index: 1000;
    max-height: 400px;
    overflow-y: auto;
    animation: fadeIn .15s ease;
}

.search-results-header {
    padding: .5rem 1rem;
    background: #f8f9fa;
    border-bottom: 1px solid var(--border-color);
    font-size: .8rem;
    color: var(--text-muted);
    position: sticky;
    top: 0;
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: .625rem 1rem;
    cursor: pointer;
    border-bottom: 1px solid #f0f0f0;
    transition: background .1s;
}
.result-item:last-child { border-bottom: none; }
.result-item:hover { background: #f8f9fa; }

.result-name { font-weight: 600; color: var(--text-main); margin-bottom: .15rem; }
.result-name mark { background: #fff3cd; padding: 0 2px; border-radius: 2px; }
.result-details { font-size: .75rem; color: var(--text-muted); }
.result-price { font-weight: 600; color: var(--success); margin-left: 1rem; white-space: nowrap; }

.search-loading { position: absolute; right: .75rem; top: 50%; transform: translateY(-50%); }
.spinner {
    width: 18px; height: 18px;
    border: 2px solid #e9ecef;
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin .6s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-6px); }
    to   { opacity: 1; transform: translateY(0); }
}

.search-result-info {
    margin: .5rem 0 1rem;
    padding: .5rem .75rem;
    background: #e7f1ff;
    border-radius: var(--bs-border-radius);
    color: var(--text-main);
    font-size: .875rem;
}

.show-all-link { color: var(--accent); text-decoration: none; margin-left: .5rem; }
.show-all-link:hover { text-decoration: underline; }

.no-results {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-muted);
    background: #f8f9fa;
    border-radius: var(--bs-border-radius);
    margin: .75rem 0;
    font-size: .9rem;
}

/* ============================================================
   PAGINATION
   ============================================================ */
.pagination {
    display: flex;
    padding-left: 0;
    list-style: none;
    gap: 2px;
}

.table-pagination-row {
    padding: .25rem .75rem !important;
    background-color: var(--panel-bg);
    box-shadow: 0 -4px 8px -4px rgba(0,0,0,.1);
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: .5rem;
}

.table-pagination-row .pagination { margin-bottom: 0; }

.page-link, .page-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: .2rem .45rem;
    font-size: .875rem;
    color: var(--accent);
    text-decoration: none;
    background-color: #fff;
    border: 1px solid var(--border-color);
    border-radius: .25rem;
    transition: all .15s;
    min-width: 2rem;
}
.page-link:hover, .page-btn:hover {
    background: #e9ecef;
    border-color: #adb5bd;
    color: var(--text-main);
}
.page-link.active, .page-btn.current,
.page-item.active .page-link {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
    cursor: default;
}
.page-link.disabled, .page-item.disabled .page-link {
    color: var(--text-muted);
    pointer-events: none;
    background-color: #fff;
    border-color: var(--border-color);
}
.page-dots { display: inline-block; padding: .2rem .3rem; color: var(--text-muted); }

.pagination-info { color: var(--text-muted); font-size: .8rem; }

/* ============================================================
   SORT LINKS
   ============================================================ */
.sort-link {
    color: inherit;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    white-space: nowrap;
}
.sort-link:hover { text-decoration: underline; opacity: .85; }

/* ============================================================
   MODAL
   ============================================================ */
.modal {
    display: none;
    position: fixed;
    z-index: 1055;
    left: 0; top: 0;
    width: 100%; height: 100%;
    overflow-x: hidden;
    overflow-y: auto;
    background: rgba(0,0,0,.5);
    backdrop-filter: blur(2px);
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: #fff;
    position: relative;
    margin: 1.75rem auto;
    padding: 1.5rem;
    width: 90%;
    max-width: 500px;
    border-radius: .5rem;
    box-shadow: 0 .5rem 1rem rgba(0,0,0,.175);
    max-height: 90vh;
    overflow-y: auto;
}

.close-btn {
    position: absolute;
    top: .75rem;
    right: 1rem;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
    background: none;
    border: none;
    line-height: 1;
    padding: 0;
}
.close-btn:hover { color: var(--text-main); }

/* ============================================================
   TABS
   ============================================================ */
.tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    padding: .5rem 1rem;
    background: transparent;
    border: 1px solid transparent;
    border-bottom: none;
    cursor: pointer;
    font-size: .875rem;
    font-family: var(--bs-body-font-family);
    border-radius: .375rem .375rem 0 0;
    transition: all .15s;
    color: var(--text-muted);
}
.tab-btn.active {
    background: var(--panel-bg);
    border-color: var(--border-color);
    border-bottom-color: var(--panel-bg);
    color: var(--text-main);
    font-weight: 700;
    margin-bottom: -1px;
}
.tab-btn:hover:not(.active) { background: #f8f9fa; color: var(--text-main); }

.tab-content { display: none; }
.tab-content.active { display: block; }

/* ============================================================
   LINKS
   ============================================================ */
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); text-decoration: underline; }

.article-link, .name_mats-link {
    color: var(--text-main);
    text-decoration: none;
    font-weight: 600;
}
.article-link:hover, .name_mats-link:hover {
    color: var(--accent);
    text-decoration: underline;
}

.link-cell {
    max-width: 200px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.link-cell a { color: var(--accent); font-size: .8rem; }

/* ============================================================
   BACK BUTTON
   ============================================================ */
.back-button { margin-bottom: 1rem; }

/* ============================================================
   DASHBOARD GRID (index page)
   ============================================================ */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}

.dash-card {
    background: var(--panel-bg);
    padding: 1.5rem;
    border-radius: var(--bs-border-radius);
    text-decoration: none;
    color: inherit;
    box-shadow: var(--shadow-sm);
    transition: transform .15s ease, box-shadow .15s ease;
    border: 1px solid var(--border-color);
    display: block;
}
.dash-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow);
    border-color: var(--accent);
    text-decoration: none;
    color: inherit;
}
.dash-card h2 { font-size: 1.1rem; margin-bottom: .375rem; }

/* ============================================================
   INFO BOX
   ============================================================ */
.info-box {
    margin-top: 1.5rem;
    padding: 1rem 1.25rem;
    background: #e7f1ff;
    border-radius: var(--bs-border-radius);
    border-left: 4px solid var(--accent);
    font-size: .875rem;
}

/* ============================================================
   NO-DATA STATE
   ============================================================ */
.no-materials {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--text-muted);
    font-size: .875rem;
}

/* ============================================================
   HINT / SMALL TEXT
   ============================================================ */
.hint {
    font-size: .8rem;
    color: var(--text-muted);
    display: block;
    margin-top: .25rem;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
    .container { padding: .75rem 1rem; }

    h1 { font-size: 1.25rem; }

    .items-table th,
    .items-table td,
    .table th,
    .table td {
        padding: .35rem .5rem;
        font-size: .75rem;
    }

    .search-wrapper { flex-direction: column; }
    .search-buttons { width: 100%; }
    .btn-search, .btn-clear { flex: 1; text-align: center; }

    .result-item { flex-direction: column; align-items: flex-start; gap: .25rem; }
    .result-price { margin-left: 0; }

    .info-table th { width: 120px; font-size: .8rem; }

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

    .page-header-row { flex-direction: column; align-items: flex-start; }
    .page-header-actions { width: 100%; }
}