:root {
    --bg: #f4f7fb;
    --surface: #ffffff;
    --surface-2: #f8fafc;
    --text: #172033;
    --muted: #687386;
    --border: #e5e9f0;
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --danger-bg: #fff1f2;
    --danger: #be123c;
    --success-bg: #ecfdf5;
    --success: #047857;
    --warning-bg: #fffbeb;
    --warning: #a16207;
    --shadow: 0 18px 50px rgba(15, 23, 42, .08);
}

[data-theme="dark"] {
    --bg: #0b1120;
    --surface: #111827;
    --surface-2: #172033;
    --text: #eef2ff;
    --muted: #9aa6b8;
    --border: #263247;
    --primary: #818cf8;
    --primary-hover: #6366f1;
    --danger-bg: #3a1521;
    --danger: #fda4af;
    --success-bg: #0d3026;
    --success: #6ee7b7;
    --warning-bg: #352b0b;
    --warning: #facc15;
    --shadow: 0 18px 50px rgba(0, 0, 0, .3);
}

* { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: var(--bg);
    color: var(--text);
}

button, input { font: inherit; }

.auth-page {
    display: grid;
    place-items: center;
    padding: 24px;
}

.auth-theme {
    position: fixed;
    top: 20px;
    right: 20px;
}

.login-card {
    width: min(430px, 100%);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 38px;
    box-shadow: var(--shadow);
}

.brand-mark {
    width: 52px;
    height: 52px;
    display: grid;
    place-items: center;
    border-radius: 15px;
    background: var(--primary);
    color: white;
    font-weight: 800;
    letter-spacing: .04em;
    margin-bottom: 20px;
}

.brand-mark.small {
    width: 38px;
    height: 38px;
    border-radius: 11px;
    margin: 0;
    font-size: 13px;
}

h1, h2, h3, p { margin-top: 0; }

h1 { font-size: 28px; margin-bottom: 8px; }
h2 { font-size: 24px; margin-bottom: 5px; }
h3 { margin-bottom: 18px; }

.muted { color: var(--muted); }

label {
    display: block;
    font-size: 14px;
    font-weight: 650;
    margin: 22px 0 8px;
}

input {
    width: 100%;
    border: 1px solid var(--border);
    background: var(--surface-2);
    color: var(--text);
    border-radius: 12px;
    padding: 13px 14px;
    outline: none;
}

input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, .12);
}

.primary-button {
    width: 100%;
    border: 0;
    border-radius: 12px;
    padding: 13px 16px;
    margin-top: 24px;
    background: var(--primary);
    color: white;
    font-weight: 700;
    cursor: pointer;
}

.primary-button:hover { background: var(--primary-hover); }

.icon-button {
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    width: 42px;
    height: 42px;
    border-radius: 12px;
    cursor: pointer;
}

.alert {
    border-radius: 12px;
    padding: 12px 14px;
    margin: 18px 0;
    font-size: 14px;
}

.alert.danger { background: var(--danger-bg); color: var(--danger); }
.alert.success { background: var(--success-bg); color: var(--success); }
.alert.warning { background: var(--warning-bg); color: var(--warning); }

.security-note {
    text-align: center;
    margin: 22px 0 0;
    color: var(--muted);
    font-size: 13px;
}

/* ERP shell */
.app-shell {
    min-height: 100vh;
    display: flex;
}

.sidebar {
    width: 255px;
    flex: 0 0 255px;
    background: var(--surface);
    border-right: 1px solid var(--border);
    padding: 20px 14px;
    display: flex;
    flex-direction: column;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 11px;
    padding: 4px 8px 24px;
}

.sidebar-brand strong,
.sidebar-brand span {
    display: block;
}

.sidebar-brand strong { font-size: 14px; }
.sidebar-brand span { color: var(--muted); font-size: 11px; margin-top: 3px; }

.nav-section {
    color: var(--muted);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: .1em;
    font-weight: 700;
    padding: 18px 12px 7px;
}

.nav-link {
    display: block;
    text-decoration: none;
    color: var(--muted);
    padding: 10px 12px;
    border-radius: 10px;
    font-size: 14px;
    margin: 2px 0;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text);
    background: var(--surface-2);
}

.nav-link.active {
    color: var(--primary);
    font-weight: 700;
}

.nav-link.disabled {
    opacity: .5;
    cursor: default;
}

.nav-link.logout {
    margin-top: auto;
    color: var(--danger);
}

.main-area {
    flex: 1;
    min-width: 0;
}

.topbar {
    min-height: 78px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 32px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
}

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

.user-pill {
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 8px 12px;
    font-size: 13px;
}

.user-pill span {
    display: block;
    color: var(--muted);
    font-size: 11px;
    margin-top: 2px;
}

.content {
    padding: 32px;
    max-width: 1400px;
}

.welcome-card,
.section-card,
.stat-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 18px;
}

.welcome-card {
    padding: 28px;
    margin-bottom: 18px;
}

.welcome-card h1 {
    max-width: 700px;
    margin-top: 8px;
}

.eyebrow {
    font-size: 11px;
    font-weight: 800;
    letter-spacing: .12em;
    color: var(--success);
}

.stat-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 18px;
}

.stat-card {
    padding: 20px;
}

.stat-card span,
.stat-card small {
    display: block;
    color: var(--muted);
}

.stat-card strong {
    display: block;
    font-size: 26px;
    margin: 8px 0;
}

.stat-card small { font-size: 12px; }

.section-card {
    padding: 24px;
}

.status-row {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    padding: 14px 0;
    border-bottom: 1px solid var(--border);
}

.status-row:last-child { border-bottom: 0; }

.status {
    font-size: 12px;
    padding: 5px 9px;
    border-radius: 999px;
}

.status.done {
    color: var(--success);
    background: var(--success-bg);
}

.status.pending {
    color: var(--warning);
    background: var(--warning-bg);
}

@media (max-width: 900px) {
    .sidebar {
        width: 210px;
        flex-basis: 210px;
    }

    .stat-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 680px) {
    .app-shell { display: block; }

    .sidebar {
        width: 100%;
        border-right: 0;
        border-bottom: 1px solid var(--border);
    }

    .sidebar nav { display: none; }

    .sidebar .logout { margin-top: 10px; }

    .topbar {
        padding: 18px;
    }

    .content {
        padding: 18px;
    }

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

    .login-card {
        padding: 28px 22px;
    }
}