:root {
    --bg: #f4f3ef;
    --ink: #20272b;
    --muted: #58666f;
    --card: #ffffff;
    --line: #cfd7dc;
    --brand: #0a6c7c;
    --brand-dark: #084f5a;
    --warn: #8b4a16;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
    color: var(--ink);
    background: radial-gradient(circle at 20% 10%, #ffffff 0%, #f4f3ef 45%, #e9ece9 100%);
}

a {
    color: var(--brand);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.topbar {
    position: sticky;
    top: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    padding: 0.9rem 1.2rem;
    border-bottom: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(4px);
}

.brand {
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: 0.03em;
}

.main-nav {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 1.2rem;
}

.dashboard-header h1 {
    margin-bottom: 0.3rem;
}

.dashboard-header p {
    margin-top: 0;
    color: var(--muted);
}

.grid-shell {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
}

.tile,
.card {
    border: 1px solid var(--line);
    background: var(--card);
    border-radius: 10px;
    padding: 1rem;
    box-shadow: 0 4px 18px rgba(32, 39, 43, 0.08);
}

.tile h2 {
    margin-top: 0;
}

.disabled-link {
    color: var(--warn);
}

.auth-shell {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 1rem;
}

.auth-container {
    width: min(520px, 100%);
}

.login-card {
    text-align: center;
}

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

.btn {
    display: inline-block;
    margin-top: 0.4rem;
    padding: 0.7rem 1rem;
    border-radius: 8px;
    background: var(--brand);
    color: #fff;
    font-weight: 600;
}

.btn:hover {
    background: var(--brand-dark);
    text-decoration: none;
}

@media (max-width: 700px) {
    .topbar {
        align-items: flex-start;
        flex-direction: column;
    }
}