:root {
    --md-primary: #1565c0;
    --md-primary-dark: #0d47a1;
    --md-primary-light: #42a5f5;
    --md-secondary: #0288d1;
    --md-surface: #ffffff;
    --md-surface-variant: #e3f2fd;
    --md-background: #f0f7ff;
    --md-on-surface: #1c1b1f;
    --md-on-surface-muted: #49454f;
    --md-outline: #b0bec5;
    --md-error: #b3261e;
    --md-success: #1b873f;
    --md-success-bg: #c8f7d4;
    --md-warning: #e65100;
    --md-radius-sm: 8px;
    --md-radius-md: 12px;
    --md-radius-lg: 16px;
    --md-radius-xl: 28px;
    --shadow-2: 0 2px 8px rgba(13, 71, 161, 0.12);
    --shadow-3: 0 8px 24px rgba(13, 71, 161, 0.18);
}

* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: 'Roboto', system-ui, sans-serif;
    font-size: 16px;
    line-height: 1.5;
    color: var(--md-on-surface);
    background: var(--md-background);
}

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

.app-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: linear-gradient(135deg, #0d47a1, #1565c0, #42a5f5);
    color: #fff;
    padding: 0.75rem 1rem;
    box-shadow: var(--shadow-2);
}
.app-header-inner {
    max-width: 1140px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}
.brand-lockup { display: flex; align-items: center; gap: 0.75rem; min-width: 0; }
.brand-mark {
    display: block;
    object-fit: contain;
    flex-shrink: 0;
}
.brand-mark-ossi {
    width: auto;
    height: 28px;
    max-width: 96px;
}
.brand-text { min-width: 0; }
.brand-text h1,
.brand-name { margin: 0; font-size: 0.9375rem; font-weight: 700; letter-spacing: 0.01em; line-height: 1.2; }
.brand-text p,
.brand-page { margin: 0.15rem 0 0; font-size: 0.8rem; opacity: 0.85; line-height: 1.2; }
.user-pill {
    display: flex; align-items: center; gap: 0.5rem;
    background: rgba(255,255,255,0.18);
    border-radius: var(--md-radius-xl);
    padding: 0.35rem 0.9rem;
    font-size: 0.9rem;
}

.app-nav {
    position: sticky;
    top: 64px;
    z-index: 90;
    background: var(--md-surface);
    box-shadow: var(--shadow-2);
    padding: 0.5rem 1rem;
}
.app-nav-inner {
    max-width: 1140px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    align-items: center;
}
.nav-link {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.45rem 0.9rem;
    border-radius: var(--md-radius-xl);
    color: var(--md-on-surface-muted);
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.15s;
}
.nav-link:hover { background: var(--md-surface-variant); color: var(--md-primary); text-decoration: none; }
.nav-link.active {
    background: linear-gradient(135deg, #1565c0, #42a5f5);
    color: #fff;
    box-shadow: 0 2px 8px rgba(21,101,192,0.35);
}
.nav-link.logout { margin-left: auto; color: var(--md-error); }
.nav-link.logout:hover { background: #fdecea; }
.nav-link .material-icons-round { font-size: 18px; }

.app-main {
    max-width: 1140px;
    margin: 0 auto;
    padding: 1.25rem 1rem 2rem;
}

.page-title { margin: 0 0 1rem; font-size: 1.5rem; font-weight: 700; color: var(--md-primary-dark); }
.page-intro {
    background: linear-gradient(135deg, #e3f2fd, #f3e8ff);
    border-left: 4px solid var(--md-primary);
    border-radius: var(--md-radius-md);
    padding: 1rem 1.25rem;
    margin-bottom: 1.25rem;
    display: flex;
    gap: 0.75rem;
    align-items: flex-start;
}
.page-intro p { margin: 0; color: var(--md-on-surface-muted); }

.card {
    background: var(--md-surface);
    border-radius: var(--md-radius-lg);
    box-shadow: var(--shadow-2);
    margin-bottom: 1.25rem;
    overflow: hidden;
}
.card-header {
    padding: 0.9rem 1.25rem;
    border-bottom: 1px solid #e8eef5;
    font-weight: 700;
    color: var(--md-primary-dark);
}
.card-body { padding: 1.25rem; }
.filters-form { border-top: 4px solid var(--md-secondary); }

.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1rem;
    margin-bottom: 1.25rem;
}
.stat-pill {
    background: var(--md-surface);
    border-radius: var(--md-radius-md);
    box-shadow: var(--shadow-2);
    padding: 1rem;
    border-left: 4px solid var(--md-primary);
}
.stat-pill .label { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--md-on-surface-muted); }
.stat-pill .value { font-size: 1.75rem; font-weight: 700; color: var(--md-primary-dark); }
.stat-pill.stat-success { border-left-color: #2e7d32; }
.stat-pill.stat-success .value { color: #2e7d32; font-size: 1.35rem; }
.stat-pill.stat-error { border-left-color: var(--md-error); }
.stat-pill.stat-error .value { color: var(--md-error); font-size: 1.35rem; }
.item-inventory-totals { margin-top: 1rem; margin-bottom: 0; }

.form-group { margin-bottom: 1rem; }
.form-group label {
    display: flex; align-items: center; gap: 0.35rem;
    font-size: 0.8rem; font-weight: 500; text-transform: uppercase;
    letter-spacing: 0.04em; color: var(--md-on-surface-muted);
    margin-bottom: 0.35rem;
}
.form-control, .form-select {
    width: 100%;
    padding: 0.65rem 0.85rem;
    border: 2px solid var(--md-outline);
    border-radius: var(--md-radius-sm);
    font: inherit;
    background: #fff;
}
.form-control:focus, .form-select:focus {
    outline: none;
    border-color: var(--md-primary);
    box-shadow: 0 0 0 3px rgba(21,101,192,0.2);
}
.form-row { display: grid; gap: 1rem; }
@media (min-width: 640px) { .form-row.cols-2 { grid-template-columns: 1fr 1fr; } .form-row.cols-3 { grid-template-columns: 1fr 1fr 1fr; } }

.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 0.35rem;
    padding: 0.6rem 1.25rem;
    border: none; border-radius: var(--md-radius-xl);
    font: inherit; font-weight: 500; cursor: pointer;
    text-decoration: none;
}
.btn-primary {
    background: linear-gradient(135deg, #1565c0, #42a5f5);
    color: #fff;
    box-shadow: 0 4px 12px rgba(21,101,192,0.35);
}
.btn-primary:hover { filter: brightness(1.05); }
.btn-secondary { background: #fff; border: 2px solid var(--md-outline); color: var(--md-on-surface); }
.btn-danger { background: linear-gradient(135deg, #b3261e, #e53935); color: #fff; }
.btn-sm { padding: 0.35rem 0.75rem; font-size: 0.85rem; }
.btn-icon { padding: 0.5rem; border-radius: var(--md-radius-sm); }

.toolbar { display: flex; flex-wrap: wrap; gap: 0.5rem; justify-content: space-between; align-items: center; margin-bottom: 1rem; }

.data-table-wrap { overflow-x: auto; }
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}
.data-table th {
    text-align: left;
    padding: 0.75rem;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    background: linear-gradient(180deg, #e3f2fd, #f5f9ff);
    color: var(--md-primary-dark);
    border-bottom: 2px solid #cfe3f7;
}
.data-table td { padding: 0.75rem; border-bottom: 1px solid #e8eef5; }
.data-table tr:hover td { background: #f3e8ff; }

.empty-state { text-align: center; padding: 2.5rem; color: var(--md-on-surface-muted); }
.empty-state .material-icons-round { font-size: 48px; opacity: 0.4; }

.badge { display: inline-block; padding: 0.15rem 0.5rem; border-radius: var(--md-radius-xl); font-size: 0.75rem; font-weight: 500; }
.badge-success { background: var(--md-success-bg); color: var(--md-success); }
.badge-warning { background: #fff3e0; color: var(--md-warning); }
.badge-error { background: #fdecea; color: var(--md-error); }
.badge-muted { background: #eceff1; color: var(--md-on-surface-muted); }

.issue-item {
    border: 1px solid #e8eef5;
    border-radius: var(--md-radius-md);
    padding: 0.85rem 1rem;
    margin-bottom: 0.75rem;
}
.issue-item:last-child { margin-bottom: 0; }
.issue-item-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 0.75rem; margin-bottom: 0.35rem; }
.issue-item-title { margin: 0; font-size: 0.95rem; font-weight: 600; }
.issue-item-meta { font-size: 0.8rem; color: var(--md-on-surface-muted); margin-bottom: 0.35rem; }
.issue-item-desc { font-size: 0.9rem; margin: 0 0 0.5rem; white-space: pre-wrap; }
.issue-item-actions { display: flex; gap: 0.35rem; flex-wrap: wrap; }
.issue-badges { display: flex; gap: 0.35rem; flex-wrap: wrap; }
.checkbox-label { display: flex; align-items: center; gap: 0.5rem; font-size: 0.9rem; cursor: pointer; }
.inline-qty-edit { display: flex; align-items: center; gap: 0.35rem; }
.inline-qty-edit .form-control-sm { width: 72px; padding: 0.25rem 0.5rem; }
.loc-min-qty { width: 72px; padding: 0.25rem 0.5rem; }
.loc-bin { min-width: 120px; max-width: 180px; padding: 0.25rem 0.5rem; }
.receive-or-divider { font-size: 0.8rem; margin: 0.5rem 0; text-align: center; }
.form-control.input-error { border-color: var(--md-error); box-shadow: 0 0 0 1px var(--md-error); }
.text-muted { color: var(--md-on-surface-muted); }

.modal-overlay {
    position: fixed; inset: 0; background: rgba(0,0,0,0.55);
    backdrop-filter: blur(4px); z-index: 200;
    display: none; align-items: center; justify-content: center; padding: 1rem;
}
.modal-overlay.open { display: flex; }
.modal-dialog {
    background: var(--md-surface);
    border-radius: var(--md-radius-lg);
    box-shadow: var(--shadow-3);
    width: 100%; max-width: 560px;
    max-height: 90vh; overflow-y: auto;
}
.modal-dialog.lg { max-width: 720px; }
.modal-header {
    padding: 1rem 1.25rem;
    background: linear-gradient(135deg, #1565c0, #0288d1);
    color: #fff;
    display: flex; justify-content: space-between; align-items: center;
}
.modal-header h3 { margin: 0; font-size: 1.1rem; }
.modal-close { background: none; border: none; color: #fff; cursor: pointer; font-size: 1.5rem; line-height: 1; }
.modal-body { padding: 1.25rem; }
.modal-footer { padding: 1rem 1.25rem; border-top: 1px solid #e8eef5; display: flex; gap: 0.5rem; justify-content: flex-end; }

.scan-input { font-size: 1.1rem; letter-spacing: 0.05em; }
.variance-negative { color: var(--md-error); font-weight: 600; }
.below-minimum td { background: #fdecea; }
.below-minimum .below-minimum,
.below-minimum td.variance-negative { color: var(--md-error); font-weight: 700; }
.variance-positive { color: var(--md-primary); font-weight: 600; }
.variance-zero { color: var(--md-success); font-weight: 600; }

.detail-grid { display: grid; grid-template-columns: 140px 1fr; gap: 0.35rem 1rem; font-size: 0.9rem; }
.detail-grid dt { font-weight: 600; color: var(--md-on-surface-muted); }
.note-item { border-bottom: 1px solid #e8eef5; padding: 0.75rem 0; }
.note-meta { font-size: 0.8rem; color: var(--md-on-surface-muted); }

/* Login */
.auth-page {
    min-height: 100vh;
    display: flex; flex-direction: column;
    background: linear-gradient(135deg, #e3f2fd, #bbdefb, #e1f5fe, #f0f7ff);
}
.auth-card-wrap { flex: 1; display: flex; align-items: center; justify-content: center; padding: 2rem 1rem; }
.auth-card {
    background: var(--md-surface);
    border-radius: var(--md-radius-lg);
    box-shadow: var(--shadow-3);
    width: 100%; max-width: 420px;
    padding: 2rem;
}
.auth-card h2 { margin: 0 0 0.25rem; color: var(--md-primary-dark); text-align: center; }
.auth-card .subtitle { color: var(--md-on-surface-muted); margin-bottom: 1.5rem; text-align: center; }
.auth-brand { text-align: center; margin-bottom: 1.5rem; }
.login-brand-logos {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1.25rem;
    flex-wrap: wrap;
}
.login-brand-mark-ossi-on-light {
    padding: 0.5rem 0.75rem;
    background: linear-gradient(135deg, var(--md-primary-dark), var(--md-primary));
    border-radius: var(--md-radius-md);
    box-shadow: 0 4px 12px rgba(21, 101, 192, 0.25);
}
.alert { padding: 0.75rem 1rem; border-radius: var(--md-radius-sm); margin-bottom: 1rem; }
.alert-danger { background: #fdecea; color: var(--md-error); }

.photo-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 0.75rem;
}
.photo-item {
    background: var(--md-surface-variant, #f5f5f5);
    border-radius: var(--md-radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-1);
}
.photo-item a { display: block; aspect-ratio: 1; background: #000; }
.photo-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.photo-item-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.25rem;
    padding: 0.35rem 0.5rem;
}
.photo-meta { font-size: 0.7rem; color: var(--md-on-surface-muted); line-height: 1.2; }
.photo-upload-btn { cursor: pointer; margin: 0; }
.photo-upload-btn input { display: none; }

.d-none { display: none !important; }

@media (max-width: 768px) {
    .app-nav-inner { gap: 0.25rem; }
    .brand-mark-ossi { height: 22px; max-width: 72px; }
    .nav-link span.label { display: none; }
    .nav-link.logout { margin-left: 0; }
    .data-table { display: none; }
    .mobile-cards { display: block; }
    .mobile-card {
        background: var(--md-surface);
        border-radius: var(--md-radius-lg);
        box-shadow: var(--shadow-2);
        padding: 1rem;
        margin-bottom: 0.75rem;
    }
    .mobile-card dl { display: grid; grid-template-columns: 100px 1fr; gap: 0.25rem; margin: 0; font-size: 0.85rem; }
    .mobile-card dt { color: var(--md-on-surface-muted); font-weight: 500; }
}
@media (min-width: 769px) {
    .mobile-cards { display: none; }
}