* {
    box-sizing: border-box;
}

:root {
    --bg: #f5f7fb;
    --card: #ffffff;
    --text: #172033;
    --muted: #6b7280;
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --border: #e5e7eb;
    --danger: #dc2626;
    --warning: #f59e0b;
    --shadow: 0 18px 50px rgba(15, 23, 42, 0.08);
}

body {
    margin: 0;
    font-family: Tahoma, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
}

.login-page {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 20px;
    background:
        radial-gradient(circle at top right, rgba(37, 99, 235, 0.18), transparent 34%),
        radial-gradient(circle at bottom left, rgba(14, 165, 233, 0.18), transparent 32%),
        var(--bg);
}

.login-card {
    width: min(420px, 100%);
    background: var(--card);
    padding: 34px;
    border-radius: 28px;
    box-shadow: var(--shadow);
}

.login-logo {
    width: 64px;
    height: 64px;
    border-radius: 22px;
    display: grid;
    place-items: center;
    background: var(--primary);
    color: #fff;
    font-size: 30px;
    font-weight: 800;
    margin-bottom: 18px;
}

.login-card h1 {
    margin: 0 0 8px;
    font-size: 25px;
}

.login-card p {
    margin: 0 0 26px;
    color: var(--muted);
}

label {
    display: block;
    margin: 14px 0 8px;
    font-weight: 700;
}

input {
    width: 100%;
    height: 48px;
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 0 14px;
    font-size: 16px;
    outline: none;
}

input:focus {
    border-color: var(--primary);
}

button,
.logout {
    border: 0;
    background: var(--primary);
    color: #fff;
    height: 48px;
    padding: 0 20px;
    border-radius: 14px;
    font-weight: 800;
    cursor: pointer;
    text-decoration: none;
    display: inline-grid;
    place-items: center;
}

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

.login-card button {
    width: 100%;
    margin-top: 22px;
}

.alert {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
    padding: 12px;
    border-radius: 14px;
    margin-bottom: 16px;
}

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

.sidebar {
    width: 280px;
    background: #0f172a;
    color: #fff;
    padding: 22px;
    position: fixed;
    right: 0;
    top: 0;
    bottom: 0;
    z-index: 20;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 28px;
}

.brand-mark {
    width: 48px;
    height: 48px;
    border-radius: 16px;
    background: var(--primary);
    display: grid;
    place-items: center;
    font-size: 24px;
    font-weight: 900;
}

.brand h1 {
    margin: 0;
    font-size: 22px;
}

.brand span {
    color: #94a3b8;
    font-size: 12px;
}

.nav {
    display: grid;
    gap: 8px;
}

.nav a {
    color: #cbd5e1;
    text-decoration: none;
    padding: 14px 16px;
    border-radius: 16px;
    font-weight: 700;
}

.nav a:hover,
.nav a.active {
    background: rgba(37, 99, 235, 0.18);
    color: #fff;
}

.main {
    width: 100%;
    margin-right: 280px;
    padding: 22px;
}

.topbar {
    height: 72px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 24px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 18px;
    margin-bottom: 22px;
}

.topbar span {
    display: block;
    color: var(--muted);
    font-size: 13px;
    margin-top: 3px;
}

.menu-btn {
    display: none;
    width: 46px;
    height: 46px;
    padding: 0;
}

.page-head {
    margin-bottom: 18px;
}

.page-head h2 {
    margin: 0 0 6px;
    font-size: 28px;
}

.page-head p {
    margin: 0;
    color: var(--muted);
}

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

.stat-card,
.panel {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 24px;
    box-shadow: var(--shadow);
    padding: 22px;
}

.stat-card span {
    color: var(--muted);
    display: block;
    margin-bottom: 12px;
}

.stat-card strong {
    font-size: 32px;
}

.stat-card.warning strong {
    color: var(--warning);
}

.steps {
    display: grid;
    gap: 12px;
    color: var(--muted);
}

@media (max-width: 900px) {
    .sidebar {
        transform: translateX(110%);
        transition: 0.25s ease;
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .main {
        margin-right: 0;
        padding: 14px;
    }

    .menu-btn {
        display: inline-grid;
    }

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

@media (max-width: 560px) {
    .cards-grid {
        grid-template-columns: 1fr;
    }

    .topbar {
        border-radius: 18px;
    }

    .login-card {
        padding: 26px;
        border-radius: 22px;
    }
}