:root {
    --primario: #2d6cdf;
    --primario-scuro: #1e4fb0;
    --testo: #1f2430;
    --testo-secondario: #5a6270;
    --bordo: #dde1e8;
    --sfondo: #f6f7fb;
    --bianco: #ffffff;
    --errore: #c0392b;
    --successo: #1e8f5f;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
    background: var(--sfondo);
    color: var(--testo);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bianco);
    border-bottom: 1px solid var(--bordo);
    padding: 10px 24px;
    flex-wrap: wrap;
    gap: 10px;
    box-shadow: 0 1px 3px rgba(31, 36, 48, 0.04);
}

.nav-brand { font-weight: 600; }

.nav-links {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 4px;
}

.nav-links a {
    color: var(--testo-secondario);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    padding: 7px 14px;
    border-radius: 20px;
    transition: background 0.15s ease, color 0.15s ease;
    white-space: nowrap;
}

.nav-links a:hover { color: var(--primario); background: var(--sfondo); }

.nav-links a.active {
    color: var(--bianco);
    background: var(--primario);
}

.nav-links a.active:hover { background: var(--primario-scuro); }

.nav-links a.nav-logout {
    color: var(--errore);
    margin-left: 8px;
}

.nav-links a.nav-logout:hover { background: #fbe9e7; }

.container {
    max-width: 900px;
    margin: 24px auto;
    padding: 0 16px;
}

h1 { font-size: 22px; margin-bottom: 4px; }
h2 { font-size: 17px; margin-top: 0; }

.card {
    background: var(--bianco);
    border: 1px solid var(--bordo);
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 20px;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bianco);
}

th, td {
    text-align: left;
    padding: 10px 12px;
    border-bottom: 1px solid var(--bordo);
    font-size: 14px;
}

th { color: var(--testo-secondario); font-weight: 500; }

form.inline { display: inline; }

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 12px;
    margin-bottom: 12px;
}

input, select {
    padding: 8px 10px;
    border: 1px solid var(--bordo);
    border-radius: 6px;
    font-size: 14px;
    width: 100%;
}

button, .btn {
    background: var(--primario);
    color: var(--bianco);
    border: none;
    padding: 9px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    text-decoration: none;
    display: inline-block;
}

button:hover, .btn:hover { background: var(--primario-scuro); }

button.danger { background: transparent; color: var(--errore); padding: 4px 8px; }
button.danger:hover { text-decoration: underline; background: transparent; }

.btn.secondary, button.secondary {
    background: transparent;
    color: var(--primario);
    border: 1px solid var(--primario);
    margin-left: 8px;
}
.btn.secondary:hover, button.secondary:hover { background: var(--sfondo); }

.flash {
    padding: 10px 14px;
    border-radius: 6px;
    margin-bottom: 16px;
    font-size: 14px;
}

.flash-success { background: #e4f6ee; color: var(--successo); }
.flash-error { background: #fbe9e7; color: var(--errore); }

.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 12px;
}

.stat-box {
    background: var(--bianco);
    border: 1px solid var(--bordo);
    border-radius: 10px;
    padding: 16px;
    text-align: center;
}

.stat-box .numero { font-size: 26px; font-weight: 600; color: var(--primario); }
.stat-box .etichetta { font-size: 13px; color: var(--testo-secondario); }

.auth-box {
    max-width: 380px;
    margin: 60px auto;
    background: var(--bianco);
    border: 1px solid var(--bordo);
    border-radius: 10px;
    padding: 28px;
}

.auth-box label { font-size: 13px; color: var(--testo-secondario); display: block; margin-top: 10px; }
.auth-box button { width: 100%; margin-top: 18px; }
.auth-box p { font-size: 13px; text-align: center; margin-top: 14px; }

.app-footer {
    text-align: center;
    padding: 16px 24px;
    margin-top: 24px;
    font-size: 12px;
    color: var(--testo-secondario);
    border-top: 1px solid var(--bordo);
}

.app-footer a { color: var(--primario); text-decoration: none; }
.app-footer a:hover { text-decoration: underline; }

.tabellone-cella { min-height: 44px; cursor: default; }

.tabellone-lezione {
    cursor: grab;
    padding: 2px 4px;
    border-radius: 4px;
    transition: background 0.1s ease;
}

.tabellone-lezione:hover { background: var(--sfondo); }
.tabellone-lezione.trascinata { opacity: 0.4; }

.tabellone-cella.tabellone-target {
    background: #dde6f5;
    outline: 2px dashed var(--primario);
    outline-offset: -2px;
}