/* PAGE CENTER */
.auth-page {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 80vh;
    background: #f4f6f9;
}

/* CARD */
.auth-card {
    width: 380px;
    background: #fff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

/* TITLE */
.auth-card h2 {
    text-align: center;
    margin-bottom: 20px;
}

/* INPUT */
.auth-card input {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border-radius: 6px;
    border: 1px solid #ddd;
}

/* BUTTON */
.auth-card button {
    width: 100%;
    padding: 10px;
    background: #2563eb;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
}

.auth-card button:hover {
    background: #1d4ed8;
}

/* ERROR */
.error {
    color: red;
    text-align: center;
}

/* ===== GLOBAL LAYOUT FIX ===== */

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

/* Sidebar */
.teacher-sidebar {
    width: 220px;
    position: fixed;
    height: 100vh;
    background: linear-gradient(180deg,#0f172a,#1e293b);
}

/* Main Area */
.main-area {
    margin-left: 220px;
    width: calc(100% - 220px);
    display: flex;
    flex-direction: column;
}

/* Content */
.main-content {
    flex: 1;
    padding: 30px;
}

/* Footer fix */
.main-footer {
    margin-top: auto;
}

/* Card fix */
.card {
    background: #fff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    margin-bottom: 20px;
}