/* ==========================================
   OPTIMAL CONTROL SYSTEM - LOGIN
========================================== */

html,
body {
    height: 100%;
    margin: 0;
    padding: 0;
    font-family: "Segoe UI", Arial, sans-serif;
    background: #D4DCE8;
}

.login-page {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 30px;
}

.login-card {
    width: 460px;
    background: #ffffff;
    border-radius: 20px;
    padding: 45px;
    box-shadow: 0 18px 40px rgba(15,23,42,.12);
    border: 1px solid #E2E8F0;
}

/* ==========================================
   BRANDING
========================================== */

.logo-box {
    width: 72px;
    height: 72px;
    margin: 0 auto 20px;
    background: #2563EB;
    color: white;
    border-radius: 16px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 28px;
    font-weight: 700;
}

.login-card h1 {
    text-align: center;
    margin: 0;
    color: #0F172A;
    font-size: 34px;
    font-weight: 700;
}

.login-card p {
    text-align: center;
    color: #64748B;
    margin-top: 8px;
    margin-bottom: 35px;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-size: 12px;
}

.login-card h2 {
    text-align: center;
    color: #334155;
    margin-bottom: 35px;
    font-size: 20px;
    font-weight: 600;
}

/* ==========================================
   FORM
========================================== */

.form-group {
    margin-bottom: 22px;
}

    .form-group label {
        display: block;
        margin-bottom: 8px;
        color: #334155;
        font-weight: 600;
    }

.form-control {
    width: 100%;
    height: 52px;
    border-radius: 12px;
    border: 1px solid #CBD5E1;
    padding: 0 18px;
    font-size: 15px;
    transition: .25s;
    box-sizing: border-box;
}

    .form-control:focus {
        outline: none;
        border-color: #2563EB;
        box-shadow: 0 0 0 4px rgba(37,99,235,.12);
    }

/* ==========================================
   BUTTON
========================================== */

.login-btn {
    width: 100%;
    height: 54px;
    margin-top: 15px;
    border: none;
    border-radius: 12px;
    background: #2563EB;
    color: white;
    font-size: 17px;
    font-weight: 600;
    cursor: pointer;
    transition: .25s;
}

    .login-btn:hover {
        background: #1D4ED8;
    }

/* ==========================================
   FOOTER
========================================== */

.version {
    margin-top: 30px;
    text-align: center;
    color: #94A3B8;
    font-size: 13px;
}