:root {
    --ink: #12324a;
    --ink-soft: #4b677e;
    --line: #dbe8f4;
    --surface: #ffffff;
    --page-top: #f3f9ff;
    --page-bottom: #f9fcff;
    --primary: #1976c8;
    --primary-strong: #0f5fa8;
    --accent: #f29533;
    --good: #237e4c;
    --danger: #b34949;
    --shadow: 0 16px 44px rgba(26, 70, 110, 0.08);
    --radius: 16px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: "Manrope", "Segoe UI", Tahoma, sans-serif;
    color: var(--ink);
    background:
        radial-gradient(900px 460px at 8% -10%, rgba(25, 118, 200, 0.16), transparent 68%),
        radial-gradient(760px 380px at 95% 3%, rgba(242, 149, 51, 0.2), transparent 68%),
        linear-gradient(180deg, var(--page-top), var(--page-bottom));
    min-height: 100vh;
}

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

.app-shell {
    width: 95%;
    max-width: none;
    margin: 0 auto;
    padding: 22px 0;
}

.topbar {
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.95);
    border-radius: 18px;
    box-shadow: var(--shadow);
    padding: 12px;
    position: sticky;
    top: 12px;
    backdrop-filter: blur(8px);
    z-index: 20;
}

.topbar-inner {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.topbar-user {
    display: flex;
    align-items: center;
    gap: 8px;
}

.user-pill {
    display: inline-flex;
    align-items: center;
    border: 1px solid #d5e7f7;
    border-radius: 999px;
    background: #f5fbff;
    color: #1d557f;
    font-size: 12px;
    font-weight: 800;
    padding: 6px 10px;
}

.user-mail {
    font-size: 12px;
    color: #56738b;
}

.brand {
    margin-right: auto;
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: #0d324f;
}

.brand-badge {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: linear-gradient(145deg, var(--primary), #44a8ef);
    color: #fff;
    display: grid;
    place-items: center;
    font-size: 13px;
    font-family: "IBM Plex Mono", monospace;
    box-shadow: 0 10px 18px rgba(25, 118, 200, 0.28);
}

.menu-toggle {
    display: none;
    border: 1px solid var(--line);
    background: #fff;
    color: var(--ink);
    border-radius: 10px;
    padding: 8px 10px;
    font-weight: 700;
    cursor: pointer;
}

.app-layout {
    margin-top: 16px;
    display: grid;
    grid-template-columns: 280px minmax(0, 1fr);
    gap: 16px;
    align-items: start;
}

.app-layout.auth-free {
    grid-template-columns: minmax(0, 1fr);
}

.sidebar {
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.95);
    border-radius: 16px;
    box-shadow: var(--shadow);
    padding: 10px;
    position: sticky;
    top: 94px;
    max-height: calc(100vh - 110px);
    overflow: auto;
    display: grid;
    gap: 8px;
}

.nav-group {
    border: 1px solid #dfeaf5;
    border-radius: 12px;
    background: #fbfdff;
    overflow: hidden;
}

.nav-group summary {
    list-style: none;
    cursor: pointer;
    padding: 10px 12px;
    font-weight: 800;
    font-size: 13px;
    color: #254e6e;
    background: #f1f8ff;
    border-bottom: 1px solid #e5eef7;
}

.nav-group summary::-webkit-details-marker {
    display: none;
}

.group-links {
    display: grid;
    gap: 6px;
    padding: 8px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #1f5278;
    font-weight: 700;
    font-size: 14px;
    border-radius: 10px;
    padding: 10px 13px;
    border: 1px solid transparent;
    transition: all .16s ease;
}

.nav-link:hover {
    border-color: var(--line);
    background: #f7fbff;
    color: #0f5fa8;
}

.nav-link.active {
    color: #fff;
    border-color: transparent;
    background: linear-gradient(135deg, var(--primary), #1f8ddf);
    box-shadow: 0 12px 18px rgba(25, 118, 200, 0.22);
}

.theme-switcher {
    display: flex;
    gap: 6px;
}

.theme-pill {
    font-family: "IBM Plex Mono", monospace;
    font-size: 12px;
    color: #1f5278;
    background: #f4f9ff;
    border: 1px solid #d8e8f7;
    border-radius: 999px;
    padding: 6px 10px;
}

.theme-pill.active {
    color: #fff;
    border-color: transparent;
    background: linear-gradient(135deg, var(--accent), #ffaf4f);
}

.page {
    display: grid;
    gap: 14px;
}

.flash {
    border-radius: 14px;
    padding: 12px 14px;
    border: 1px solid;
    font-weight: 600;
}

.flash.success {
    border-color: #bcdcc9;
    background: #ecf8f1;
    color: var(--good);
}

.flash.error {
    border-color: #ebc3c3;
    background: #fff1f1;
    color: var(--danger);
}

.panel {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.panel-head {
    padding: 16px 18px 10px;
    border-bottom: 1px solid #eef4fb;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
    justify-content: space-between;
}

.panel-title {
    margin: 0;
    font-size: 23px;
    letter-spacing: -0.02em;
}

.panel-subtitle {
    margin: 6px 0 0;
    color: var(--ink-soft);
    font-size: 14px;
}

.panel-body {
    padding: 16px 18px 18px;
}

.toolbar {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 12px;
}

.toolbar.compact { margin: 0; }

.btn {
    border: 0;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 14px;
    cursor: pointer;
    font: inherit;
    font-weight: 700;
    color: #fff;
    background: linear-gradient(140deg, var(--primary), #1e8cdc);
    transition: transform .12s ease, box-shadow .12s ease;
    box-shadow: 0 8px 16px rgba(25, 118, 200, 0.22);
}

.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn.orange {
    background: linear-gradient(145deg, var(--accent), #ffaf4f);
    box-shadow: 0 8px 16px rgba(242, 149, 51, 0.24);
}

.btn.gray {
    background: linear-gradient(145deg, #69859f, #7f98af);
    box-shadow: 0 8px 16px rgba(60, 89, 114, 0.2);
}

.btn.slim { padding: 8px 10px; font-size: 13px; }

input, textarea, select {
    width: 100%;
    border: 1px solid #cfe0ef;
    border-radius: 10px;
    padding: 10px 12px;
    font: inherit;
    color: #15364f;
    background: #fff;
    transition: border-color .15s ease, box-shadow .15s ease;
}

input:focus, textarea:focus, select:focus {
    outline: 0;
    border-color: #89bde8;
    box-shadow: 0 0 0 3px rgba(25, 118, 200, 0.12);
}

.input-wide { min-width: 260px; flex: 1 1 340px; }

.label {
    display: block;
    font-size: 12px;
    font-weight: 700;
    color: #53708a;
    margin-bottom: 5px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-grid {
    display: grid;
    gap: 10px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.field-stack { margin-top: 10px; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 14px; }
.section-title { margin: 0 0 10px; font-size: 18px; letter-spacing: -0.01em; }
.section-title.tight { margin: 0; }

.f-grid {
    display: grid;
    gap: 10px;
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.invoice-quick-grid {
    display: grid;
    gap: 10px;
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.invoice-buyer-grid {
    display: grid;
    gap: 10px;
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.invoice-seller-grid {
    display: grid;
    gap: 10px;
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.position-main-grid {
    display: grid;
    gap: 10px;
    grid-template-columns: minmax(220px, 2.2fr) repeat(4, minmax(100px, 1fr));
}

.form-advanced {
    margin-top: 10px;
    border-top: 1px dashed #d9e6f2;
    padding-top: 8px;
}

.form-advanced summary {
    cursor: pointer;
    font-weight: 700;
    color: #355c7c;
}

.f-note {
    margin-top: 8px;
    color: #658098;
    font-size: 13px;
}

.position-list { display: grid; gap: 10px; }

.position-item {
    border: 1px solid #deebf7;
    background: #f9fcff;
    border-radius: 14px;
    padding: 12px;
}

.position-head {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    align-items: center;
    margin-bottom: 10px;
}

.position-title {
    margin: 0;
    font-size: 15px;
    color: #204866;
}

.api-banner {
    border-radius: 12px;
    border: 1px solid;
    padding: 12px;
    margin-bottom: 12px;
}

.api-banner.ok {
    border-color: #bcdcc9;
    background: #ecf8f1;
    color: var(--good);
}

.api-banner.err {
    border-color: #ebc3c3;
    background: #fff1f1;
    color: var(--danger);
}

.table-shell {
    border: 1px solid #e0ebf5;
    border-radius: 14px;
    overflow: auto;
    background: #fff;
}

table.data-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 860px;
}

.data-table th {
    background: #f4f9ff;
    color: #3f607a;
    font-size: 12px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    padding: 11px 10px;
    border-bottom: 1px solid #deebf8;
    text-align: left;
}

.data-table .w-id { width: 90px; }
.data-table .w-name { width: 28%; }
.data-table .w-contact { width: 25%; }
.data-table .w-actions { width: 180px; }

.data-table td {
    padding: 10px;
    border-bottom: 1px solid #eef4fb;
    vertical-align: top;
    color: #173951;
}

.data-table tr:hover td { background: #fbfdff; }

.stack { display: grid; gap: 3px; }
.muted { color: #6a859c; font-size: 13px; }
.mono { font-family: "IBM Plex Mono", monospace; font-size: 13px; }
.chip {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 999px;
    background: #edf6ff;
    color: #256ca5;
    border: 1px solid #d1e7fa;
    font-size: 12px;
    font-weight: 700;
}

.card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 14px;
    box-shadow: var(--shadow);
}

.login-panel {
    max-width: 460px;
    margin: 20px auto 0;
}

@media (max-width: 960px) {
    .f-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .invoice-quick-grid,
    .invoice-buyer-grid,
    .invoice-seller-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .position-main-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 820px) {
    .app-shell { width: 100%; padding: 14px; }
    .menu-toggle { display: inline-flex; }
    .app-layout {
        grid-template-columns: 1fr;
    }
    .sidebar {
        display: none;
        position: static;
        max-height: none;
        margin-top: 10px;
    }
    .sidebar.open { display: grid; }
    .theme-switcher {
        width: 100%;
        margin-left: 0;
    }
    .topbar-user {
        width: 100%;
        justify-content: flex-start;
    }
    .form-grid,
    .f-grid,
    .invoice-quick-grid,
    .invoice-buyer-grid,
    .invoice-seller-grid,
    .position-main-grid { grid-template-columns: 1fr; }
}