:root {
    --bg: #07111f;
    --panel: #0f1b2d;
    --panel-2: #142338;
    --line: #24364f;
    --text: #eef6ff;
    --muted: #9fb2c8;
    --accent: #38bdf8;
    --accent-2: #0ea5e9;
    --danger: #ef4444;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: radial-gradient(circle at top left, #123055, #07111f 46%, #030712);
    color: var(--text);
    font-family: Arial, Helvetica, sans-serif;
}

a {
    color: inherit;
}

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

.sidebar {
    width: 260px;
    background: rgba(7, 17, 31, .96);
    border-right: 1px solid var(--line);
    padding: 24px 18px;
}

.brand {
    margin-bottom: 28px;
}

.brand-main {
    font-size: 26px;
    font-weight: 900;
    letter-spacing: 1px;
}

.brand-sub {
    color: var(--muted);
    font-size: 13px;
    margin-top: 4px;
}

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

.menu a {
    text-decoration: none;
    padding: 11px 12px;
    border-radius: 10px;
    color: var(--muted);
}

.menu a:hover {
    background: var(--panel-2);
    color: var(--text);
}

.main {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.topbar {
    height: 70px;
    border-bottom: 1px solid var(--line);
    background: rgba(15, 27, 45, .88);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 28px;
}

.userbox {
    color: var(--muted);
    font-size: 14px;
}

.userbox a {
    margin-left: 14px;
    color: var(--accent);
    text-decoration: none;
}

.hero {
    margin: 28px;
    padding: 28px;
    border: 1px solid var(--line);
    background: linear-gradient(135deg, rgba(15, 27, 45, .96), rgba(20, 35, 56, .96));
    border-radius: 18px;
}

.hero h1 {
    margin: 0 0 10px;
    font-size: 30px;
}

.hero p {
    margin: 0;
    color: var(--muted);
    line-height: 1.55;
    max-width: 900px;
}

.stats {
    margin: 0 28px 24px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 14px;
}

.stats div {
    background: rgba(15, 27, 45, .88);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 18px;
}

.stats span {
    font-size: 28px;
    font-weight: 800;
    display: block;
}

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

.module-grid {
    margin: 0 28px 28px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 16px;
}

.module-card {
    background: rgba(15, 27, 45, .9);
    border: 1px solid var(--line);
    border-radius: 16px;
    padding: 20px;
    min-height: 170px;
}

.module-card:hover {
    border-color: var(--accent);
    background: rgba(20, 35, 56, .96);
}

.module-card h2 {
    margin: 0 0 10px;
    font-size: 20px;
}

.module-card p {
    color: var(--muted);
    line-height: 1.45;
    min-height: 58px;
}

.module-card a,
.back-link {
    display: inline-block;
    background: var(--accent);
    color: #03121f;
    text-decoration: none;
    font-weight: 800;
    padding: 9px 12px;
    border-radius: 10px;
}

.back-link {
    margin-left: 28px;
}

.footer {
    margin-top: auto;
    border-top: 1px solid var(--line);
    padding: 20px 28px;
    color: var(--muted);
    font-size: 13px;
}

.login-body {
    display: grid;
    place-items: center;
    min-height: 100vh;
}

.login-card {
    width: min(420px, calc(100% - 32px));
    background: rgba(15, 27, 45, .94);
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 30px;
}

.login-brand {
    font-size: 30px;
    font-weight: 900;
}

.login-subtitle {
    color: var(--muted);
    margin: 5px 0 24px;
}

.login-card label {
    display: block;
    margin: 14px 0 7px;
    color: var(--muted);
}

.login-card input {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: #07111f;
    color: var(--text);
    padding: 12px;
}

.login-card button {
    width: 100%;
    margin-top: 20px;
    border: 0;
    border-radius: 10px;
    background: var(--accent);
    color: #03121f;
    padding: 12px;
    font-weight: 900;
    cursor: pointer;
}

.alert {
    background: rgba(239, 68, 68, .14);
    border: 1px solid rgba(239, 68, 68, .5);
    color: #fecaca;
    padding: 12px;
    border-radius: 10px;
}

.hint {
    margin-top: 18px;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.5;
}

@media (max-width: 760px) {
    .app-shell {
        display: block;
    }

    .sidebar {
        width: 100%;
    }

    .topbar {
        height: auto;
        gap: 10px;
        align-items: flex-start;
        flex-direction: column;
        padding: 18px;
    }
}