/* RESET & LAYOUT */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}
body, html {
    width: 100%;
    height: 100%;
    background-color: #0b2a3c;
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    overflow: hidden;
    user-select: none;
    -webkit-user-select: none;
}

.screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    transition: opacity 0.3s ease;
}

/* LOGIN SCREEN */
#loginScreen {
    background: linear-gradient(145deg, #0b2a3c 0%, #123b4e 100%);
    z-index: 100;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}
.login-box {
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 40px 25px;
    border-radius: 30px;
    text-align: center;
    width: 85%;
    max-width: 360px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    box-shadow: 0 25px 50px rgba(0,0,0,0.4);
}
.login-box h2 { 
    color: #7fd1d7; 
    margin-bottom: 10px; 
    font-weight: 300;
    letter-spacing: 3px;
}
.login-box p {
    color: #fff;
    font-size: 0.9rem;
    margin-bottom: 20px;
    opacity: 0.8;
}

.token-input {
    width: 100%;
    padding: 16px;
    border-radius: 50px;
    border: 2px solid #3fa9b0;
    background: rgba(0,0,0,0.3);
    color: white;
    text-align: center;
    font-size: 1.2rem;
    margin-bottom: 20px;
    outline: none;
}

.btn-login {
    width: 100%;
    padding: 16px;
    border-radius: 50px;
    border: none;
    background: #3fa9b0;
    color: #0b2a3c;
    font-weight: bold;
    font-size: 1.1rem;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: 0 8px 0 #1e5f64;
    transition: all 0.1s;
}

/* EXAM SCREEN & HEADER */
#formScreen {
    z-index: 50;
    background: white;
    display: none;
    flex-direction: column;
}

.exam-header {
    background: #0b2a3c;
    color: white;
    padding: 10px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 60px;
    border-bottom: 2px solid #3fa9b0;
}

#timerDisplay {
    font-weight: bold;
    font-size: 1.1rem;
    color: #7fd1d7;
}

iframe {
    flex: 1;
    width: 100%;
    border: none;
}

/* FLOATING CLOSE BUTTON */
#btnClose {
    width: 35px;
    height: 35px;
    background: rgba(231, 76, 60, 1);
    color: white;
    border: 2px solid white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: bold;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(0,0,0,0.3);
}

/* CHEAT OVERLAY */
#cheatOverlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.98);
    color: white;
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    text-align: center;
    padding: 20px;
}

.hidden { display: none !important; }