:root {
    --bg: #0f172a;            /* slate-900 page background */
    --bg-2: #111c33;          /* slightly lifted */
    --surface: #1e293b;       /* slate-800 cards */
    --surface-2: #243449;     /* hover / inputs */
    --border: #334155;        /* slate-700 */
    --border-soft: #2a3a52;
    --text: #e2e8f0;          /* slate-200 */
    --text-muted: #94a3b8;    /* slate-400 */
    --text-dim: #64748b;      /* slate-500 */
    --accent: #2563eb;        /* corporate blue-600 */
    --accent-hover: #1d4ed8;  /* blue-700 */
    --accent-soft: rgba(37, 99, 235, .14);
    --accent-bright: #93c5fd; /* blue-300 for text-on-dark */
    --accent-text: #ffffff;   /* text on solid accent */
    --danger: #f43f5e;
    --warning: #f59e0b;
    --success: #22c55e;
    --info: #38bdf8;
    --sidebar-w: 248px;
    --radius: 12px;
    --shadow: 0 8px 24px rgba(0,0,0,.35);
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
    background: var(--bg);
    color: var(--text);
    font-family: "Inter", "Segoe UI", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    margin: 0;
    min-height: 100vh;
    overflow-x: clip;   /* stop stray horizontal scroll without breaking sticky topbar */
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-feature-settings: "cv11", "ss01";
}

h1, h2, h3, h4, h5, h6, .h1, .h2, .h3, .h4, .h5, .h6 {
    letter-spacing: -0.011em;
    font-weight: 600;
}

a { color: var(--accent-bright); text-decoration: none; }
a:hover { color: #bfdbfe; text-decoration: underline; text-underline-offset: 2px; }

/* Crisp stroke icons (Lucide-style) used via <svg class="ico"><use/></svg> */
.ico, .svg-ico {
    width: 1.05em; height: 1.05em;
    fill: none; stroke: currentColor; stroke-width: 2;
    stroke-linecap: round; stroke-linejoin: round;
    flex: 0 0 auto; vertical-align: -0.16em;
}
.svg-ico-lg { width: 1.4em; height: 1.4em; }

/* ---------------- App shell ---------------- */
/* Sidebar is position:fixed (out of flow), so .app must NOT be flex — otherwise
   .main would be full-width AND margin-left-shifted, overflowing by the sidebar
   width. Keep .main a normal block that fills the space left of its margin. */
.app { min-height: 100vh; }

.sidebar {
    width: var(--sidebar-w);
    background: var(--bg-2);
    border-right: 1px solid var(--border);
    position: fixed;
    top: 0; bottom: 0; left: 0;
    display: flex;
    flex-direction: column;
    z-index: 1030;
    transition: transform .2s ease;
}

.sidebar-brand {
    display: flex; align-items: center; gap: .6rem;
    padding: 1.15rem 1.25rem;
    font-weight: 700; font-size: 1.15rem; letter-spacing: .5px;
    color: #fff; border-bottom: 1px solid var(--border);
}
.sidebar-brand .logo {
    width: 34px; height: 34px; border-radius: 9px;
    background: linear-gradient(135deg, #3b82f6, #1e40af);
    display: grid; place-items: center; font-size: 1.1rem;
}

.sidebar-nav { padding: .75rem .6rem; overflow-y: auto; flex: 1; }
.sidebar-nav .nav-section {
    font-size: .68rem; text-transform: uppercase; letter-spacing: .12em;
    color: var(--text-dim); padding: 1rem .8rem .4rem;
}
.sidebar-nav a {
    display: flex; align-items: center; gap: .75rem;
    padding: .6rem .8rem; border-radius: 9px;
    color: var(--text-muted); font-weight: 500; margin-bottom: 2px;
    transition: background .12s, color .12s;
}
.sidebar-nav a .ico { width: 20px; text-align: center; font-size: 1rem; opacity: .9; }
.sidebar-nav a:hover { background: var(--surface-2); color: var(--text); }
.sidebar-nav a.active {
    background: var(--accent-soft); color: var(--accent-bright);
    box-shadow: inset 3px 0 0 var(--accent);
}
.sidebar-nav a.active .ico { color: var(--accent-bright); }

/* ---------------- Main column ---------------- */
.main { margin-left: var(--sidebar-w); min-height: 100vh; display: flex; flex-direction: column; min-width: 0; }

.topbar {
    height: 62px;
    background: rgba(17, 28, 51, .85);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 1.5rem; position: sticky; top: 0; z-index: 1020;
}
.topbar h1 { font-size: 1.15rem; font-weight: 600; margin: 0; color: #fff; }
.topbar .sidebar-toggle {
    background: none; border: none; color: var(--text); font-size: 1.4rem;
    display: none; margin-right: .5rem;
}

.content { padding: 1.5rem; flex: 1; }

.footer { padding: 1rem 1.5rem; color: var(--text-dim); border-top: 1px solid var(--border); font-size: .82rem; }

/* ---------------- User menu ---------------- */
.user-menu .btn-user {
    display: flex; align-items: center; gap: .6rem;
    background: var(--surface); border: 1px solid var(--border);
    color: var(--text); border-radius: 999px; padding: .35rem .85rem .35rem .4rem; font-weight: 500;
}
.user-menu .btn-user:hover { background: var(--surface-2); }
.user-menu .avatar {
    width: 30px; height: 30px; border-radius: 50%;
    background: linear-gradient(135deg, #3b82f6, #1e40af);
    color: #fff; display: grid; place-items: center; font-weight: 700; font-size: .8rem;
}
.dropdown-menu {
    background: var(--surface); border: 1px solid var(--border);
    box-shadow: var(--shadow); border-radius: 10px; padding: .4rem;
}
.dropdown-menu .dropdown-item { color: var(--text); border-radius: 7px; padding: .5rem .7rem; }
.dropdown-menu .dropdown-item:hover { background: var(--surface-2); color: #fff; }
.dropdown-menu .dropdown-divider { border-color: var(--border); }
.dropdown-header { color: var(--text-dim); }

/* ---------------- Cards ---------------- */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); color: var(--text); box-shadow: 0 1px 2px rgba(0,0,0,.18); }
.card-header { background: transparent; border-bottom: 1px solid var(--border); font-weight: 600; padding: .85rem 1.1rem; }
.card-body { padding: 1.1rem; }

/* KPI stat cards */
.stat {
    border-radius: var(--radius); border: 1px solid var(--border); background: var(--surface);
    padding: 1.1rem 1.25rem; display: flex; flex-direction: column; gap: .15rem;
    position: relative; overflow: hidden; transition: transform .12s, border-color .12s; height: 100%;
}
.stat:hover { transform: translateY(-2px); border-color: var(--accent); }
.stat .stat-value { font-size: 1.9rem; font-weight: 700; line-height: 1.1; color: #fff; font-variant-numeric: tabular-nums; letter-spacing: -0.02em; }
.stat .stat-label { color: var(--text-muted); font-size: .82rem; text-transform: uppercase; letter-spacing: .04em; }
.stat .stat-ico { position: absolute; right: 1rem; top: 1rem; opacity: .35; width: 22px; height: 22px; color: var(--accent-bright); }
.stat.accent { box-shadow: inset 0 -3px 0 var(--accent); }
.stat.danger { box-shadow: inset 0 -3px 0 var(--danger); }
.stat.warning { box-shadow: inset 0 -3px 0 var(--warning); }
.stat.success { box-shadow: inset 0 -3px 0 var(--success); }
.stat.info { box-shadow: inset 0 -3px 0 var(--info); }

/* ---------------- Tables ---------------- */
.table {
    color: var(--text); border-color: var(--border); margin-bottom: 0;
    --bs-table-bg: transparent; --bs-table-color: var(--text);
    --bs-table-striped-bg: rgba(255,255,255,.025); --bs-table-striped-color: var(--text);
    --bs-table-hover-bg: var(--accent-soft); --bs-table-hover-color: var(--text);
    --bs-table-border-color: var(--border-soft);
}
.table thead th {
    color: var(--text-muted); text-transform: uppercase; font-size: .72rem; letter-spacing: .05em;
    font-weight: 600; border-bottom: 1px solid var(--border); background: var(--bg-2); white-space: nowrap;
}
.table td, .table th { padding: .7rem .85rem; vertical-align: middle; font-variant-numeric: tabular-nums; }
.table tbody tr { transition: background .1s; }
.table-card { padding: 0; overflow: hidden; }

/* ---------------- Forms ---------------- */
.form-label { color: var(--text-muted); font-weight: 500; font-size: .83rem; margin-bottom: .3rem; }
.form-control, .form-select {
    background: var(--surface-2); border: 1px solid var(--border); color: var(--text);
    border-radius: 9px; padding: .5rem .7rem;
}
.form-control:focus, .form-select:focus {
    background: var(--surface-2); color: var(--text); border-color: var(--accent);
    box-shadow: 0 0 0 .2rem var(--accent-soft);
}
.form-control::placeholder { color: var(--text-dim); }
.form-control:disabled, .form-select:disabled { background: var(--surface); opacity: .6; }
.form-select option { background: var(--surface); color: var(--text); }
.form-check-input { background-color: var(--surface-2); border-color: var(--border); }
.form-check-input:checked { background-color: var(--accent); border-color: var(--accent); }
.input-group-text { background: var(--bg-2); border-color: var(--border); color: var(--text-muted); }
.text-danger, .field-validation-error { color: #fda4af !important; font-size: .82rem; }
.validation-summary-errors { color: #fda4af; }
.validation-summary-errors ul { margin-bottom: 0; }
hr { border-color: var(--border); opacity: 1; }

/* ---------------- Buttons ---------------- */
.btn { border-radius: 9px; font-weight: 500; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.btn-primary:hover, .btn-primary:focus { background: var(--accent-hover); border-color: var(--accent-hover); color: var(--accent-text); }
.btn-outline-primary { color: var(--accent-bright); border-color: var(--accent); }
.btn-outline-primary:hover { background: var(--accent); color: var(--accent-text); }
.btn-secondary { background: var(--surface-2); border-color: var(--border); color: var(--text); }
.btn-secondary:hover { background: var(--border); color: #fff; }
.btn-outline-secondary { color: var(--text-muted); border-color: var(--border); }
.btn-outline-secondary:hover { background: var(--surface-2); color: var(--text); border-color: var(--border); }
.btn-danger { background: var(--danger); border-color: var(--danger); }
.btn-outline-danger { color: var(--danger); border-color: var(--danger); }
.btn-outline-danger:hover { background: var(--danger); color: #fff; }
.btn-sm { padding: .25rem .55rem; font-size: .8rem; }
.btn-icon { display: inline-grid; place-items: center; width: 32px; height: 32px; padding: 0; }

/* ---------------- Badges ---------------- */
.badge { font-weight: 600; padding: .35em .6em; border-radius: 6px; font-size: .72rem; }
.badge.b-success { background: rgba(34,197,94,.16); color: #4ade80; }
.badge.b-danger  { background: rgba(244,63,94,.16); color: #fb7185; }
.badge.b-warning { background: rgba(245,158,11,.16); color: #fbbf24; }
.badge.b-info    { background: rgba(56,189,248,.16); color: #7dd3fc; }
.badge.b-muted   { background: rgba(148,163,184,.16); color: #cbd5e1; }
.badge.b-accent  { background: var(--accent-soft); color: var(--accent-bright); }

/* ---------------- Modal ---------------- */
.modal-content {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--radius); color: var(--text); box-shadow: var(--shadow);
}
.modal-header { border-bottom: 1px solid var(--border); padding: 1rem 1.25rem; }
.modal-header .modal-title { font-weight: 600; }
.modal-body { padding: 1.25rem; }
.modal-footer { border-top: 1px solid var(--border); padding: .85rem 1.25rem; }
.btn-close { filter: invert(1) grayscale(1) brightness(1.6); }
.modal-backdrop.show { opacity: .65; }

/* ---------------- Alerts ---------------- */
.alert { border-radius: 10px; border: 1px solid transparent; }
.alert-success { background: rgba(34,197,94,.12); border-color: rgba(34,197,94,.3); color: #86efac; }
.alert-danger { background: rgba(244,63,94,.12); border-color: rgba(244,63,94,.3); color: #fda4af; }
.alert-info { background: rgba(56,189,248,.12); border-color: rgba(56,189,248,.3); color: #bae6fd; }
.alert-warning { background: rgba(245,158,11,.12); border-color: rgba(245,158,11,.3); color: #fcd34d; }

/* ---------------- Auth pages ---------------- */
.auth-wrap { min-height: 100vh; display: grid; place-items: center; padding: 2rem 1rem; }
.auth-card { width: 100%; max-width: 420px; }
.auth-brand { text-align: center; margin-bottom: 1.5rem; }
.auth-brand .logo {
    width: 52px; height: 52px; border-radius: 13px; margin: 0 auto .6rem;
    background: linear-gradient(135deg, #3b82f6, #1e40af);
    display: grid; place-items: center; font-size: 1.6rem;
}

/* ---------------- Manage (account) nav ---------------- */
.manage-nav .list-group-item { background: var(--surface); border-color: var(--border); color: var(--text-muted); }
.manage-nav .list-group-item.active { background: var(--accent-soft); color: var(--accent-bright); border-color: var(--border); }
.manage-nav .list-group-item:hover { color: var(--text); }

.text-muted, .text-secondary { color: var(--text-muted) !important; }
.spinner-pad { padding: 2.5rem; text-align: center; color: var(--text-muted); }
.page-actions { display: flex; gap: .5rem; align-items: center; }

/* ---------------- Responsive ---------------- */
@media (max-width: 992px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.open { transform: translateX(0); }
    .main { margin-left: 0; }
    .topbar .sidebar-toggle { display: block; }
}