/* Reset some default styles */
body, html {
    width: 100vw;
    min-height: 100vh;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    background: #1A1A1A;
    overflow-x: hidden;
}

/* Main background */
.main-bg {
    width: 100vw;
    min-height: 100vh;
    background: #1A1A1A;
    position: relative;
    overflow: hidden;
    font-family: 'Montserrat', Arial, sans-serif;
    /* Grid background */
    background-image: linear-gradient(rgba(255,255,255,0.07) 1px, transparent 1px),
                      linear-gradient(90deg, rgba(255,255,255,0.07) 1px, transparent 1px);
    background-size: 120px 120px;
}

/* Navbar */
.navbar {
    width: 100vw;
    height: 99px;
    background: #000;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    position: relative;
    z-index: 2;
}
.navbar-left {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-left: 40px;
    margin-right: 0;
}
.logo-img {
    width: 45px;
    height: 45px;
    margin-right: 0; /* Sát vào vạch kẻ dọc */
}
.logo-img2 {
    width: 59px;
    height: 35px;
    margin-left: 0; /* Sát vào vạch kẻ dọc */
}
.logo-divider {
    display: inline-block;
    width: 1.5px;
    height: 36px;
    background: #fff;
    opacity: 0.5;
    margin: 0 4px; /* Giữ khoảng cách nhỏ giữa logo và vạch kẻ */
    border-radius: 2px;
    vertical-align: middle;
}
.navbar-menu {
    display: flex;
    align-items: center;
    gap: 48px;
    margin: 0 auto;
    position: absolute;
    left: 0; right: 0;
    justify-content: center;
}
.menu-item {
    color: #fff;
    font-size: 18px;
    font-family: 'Montserrat', Arial, sans-serif;
    font-weight: 400;
    text-decoration: none;
    opacity: 0.7;
    transition: opacity 0.2s, font-weight 0.2s;
}
.menu-item.active, .menu-item:hover {
    opacity: 1;
    font-weight: 700;
    border-bottom: none;
    text-decoration: none;
}

/* Quiz progress */
.quiz-progress {
    position: absolute;
    left: 40px; /* Trùng với lề trái của logo ở navbar-left */
    top: 172px;
    display: flex;
    align-items: center; /* Đổi từ flex-end sang center để căn giữa theo chiều dọc */
    gap: 0;
    flex-direction: row;
    z-index: 3; /* Đảm bảo nổi lên trên header */
}
.quiz-progress-current {
    color: #2240F0;
}
.quiz-progress-total {
    color: #fff;
}
.quiz-progress-current, .quiz-progress-total {
    font-size: 60px;
    font-family: 'Abhaya Libre ExtraBold', serif;
    font-weight: 800;
    text-transform: capitalize;
    line-height: 1;
}

/* Next button */
.next-btn {
    position: absolute;
    right: 48px;
    top: 172px; /* Đặt cùng top với .quiz-progress để mũi tên ngang hàng */
    width: 48px;
    height: 48px;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 2;
}
.next-arrow {
    display: block;
    width: 40px;
    height: 40px;
    margin: 4px;
    position: relative;
}
.next-arrow::before {
    content: none;
}
.next-btn:hover .next-arrow::before {
    background: #3a7afe;
}

/* Question */
.quiz-question {
    width: 763px;
    margin: 0 auto;
    position: static;
    display: block;
    text-align: center;
    color: #fff;
    font-size: 52px;
    font-family: 'Montserrat', italic;
    font-weight: 500;
    text-decoration: underline;
    text-decoration-color: #2240F0;
    text-decoration-thickness: 4px;
    text-underline-offset: 6px;
    line-height: 1.2;
    z-index: 1;
    margin-top: 80px; /* Đưa lên cao hơn một chút */
    font-style: italic;
}
.quiz-question u {
    color: #3a7afe;
    text-decoration-thickness: 2px;
    text-underline-offset: 6px;
}

/* Options */
.quiz-options {
    width: 449px;
    margin: 40px auto 0 auto;
    position: static;
    display: flex;
    flex-direction: column;
    gap: 16px;
    z-index: 1;
}
.option-btn {
    display: flex;
    align-items: center;
    background: #565454;
    border: none;
    border-radius: 34px;
    color: #fff;
    font-size: 32px;
    font-family: 'Montserrat', Arial, sans-serif;
    font-weight: 400;
    padding: 12px 20px;
    margin: 0;
    width: 100%;
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
    outline: none;
    gap: 12px;
}
.option-btn.selected, .option-btn:active {
    background: #2240F0;
    color: #fff;
}
.option-btn:hover {
    background: #2240F0;
    color: #fff;
}
.option-btn.correct {
    background: #1abc9c !important;
    color: #fff !important;
}
.option-btn.wrong {
    background: #e74c3c !important;
    color: #fff !important;
}
.option-number {
    width: 39px;
    height: 39px;
    border-radius: 50%;
    outline: 2px #fff solid;
    outline-offset: -2px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    font-family: 'Montserrat', Arial, sans-serif;
    font-weight: 400;
    margin-right: 10px;
}

/* Completed Message */
.quiz-completed-message {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 200px;
    font-size: 2rem;
    font-weight: bold;
    color: #fff;
    margin-top: 40px;
    background: none;
    text-decoration: none;
    text-underline: none;
}
.quiz-completed-score {
    font-size: 2.5rem;
    color: #1a73e8;
    font-weight: bold;
    margin-top: 10px;
}
.quiz-completed-score span {
    color: #e67e22;
}

/* Responsive */
@media (max-width: 1000px) {
    .quiz-question {
        width: 90vw;
        font-size: 32px;
        margin-top: 60px;
    }
    .quiz-options {
        width: 90vw;
        margin-top: 24px;
    }
    .quiz-progress {
        left: 16px;
        top: 120px;
    }
    .next-btn {
        right: 16px;
        top: 112px;
    }
    .navbar {
        height: 64px;
    }
    .logo-img, .logo-img2 {
        width: 32px;
        height: 32px;
    }
    .logo-divider {
        height: 24px;
    }
    .navbar-left {
        margin-left: 12px;
    }
    .navbar-menu {
        gap: 16px;
        font-size: 14px;
    }
    .option-btn {
        font-size: 20px;
        padding: 10px 12px;
        border-radius: 24px;
    }
    .option-number {
        width: 28px;
        height: 28px;
        font-size: 18px;
    }
    .quiz-progress-current, .quiz-progress-total {
        font-size: 32px;
    }
}

@media (max-width: 600px) {
    .quiz-question {
        font-size: 18px;
        margin-top: 32px;
    }
    .quiz-options {
        gap: 8px;
    }
    .option-btn {
        font-size: 14px;
        padding: 8px 8px;
        border-radius: 16px;
    }
    .option-number {
        width: 20px;
        height: 20px;
        font-size: 12px;
    }
    .quiz-progress-current, .quiz-progress-total {
        font-size: 18px;
    }
    .navbar {
        height: 44px;
    }
    .logo-img, .logo-img2 {
        width: 20px;
        height: 20px;
    }
    .logo-divider {
        height: 14px;
    }
    .navbar-left {
        margin-left: 4px;
    }
    .navbar-menu {
        gap: 6px;
        font-size: 10px;
    }
}