/* ==================== Reset & Base Styles ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

/* ==================== Quiz Container ==================== */
.quiz-container {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    min-height: calc(100vh - 40px);
    display: flex;
    flex-direction: column;
}

/* ==================== Header ==================== */
.quiz-header {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: white;
}

.quiz-header .logo a {
    font-size: 24px;
    font-weight: 700;
    color: white;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
}

.quiz-header .logo i {
    font-size: 28px;
}

.btn-secondary {
    padding: 10px 20px;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

/* ==================== Progress Container ==================== */
.progress-container {
    padding: 30px 40px;
    background: #f8f9fa;
    border-bottom: 1px solid #e0e6ed;
}

.progress-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 12px;
    font-weight: 600;
    color: #2c3e50;
}

.current-question {
    font-size: 18px;
    color: #667eea;
}

.total-questions {
    font-size: 16px;
    color: #7f8c8d;
}

.progress-bar {
    height: 12px;
    background: #e0e6ed;
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    border-radius: 10px;
    transition: width 0.4s ease;
    box-shadow: 0 2px 4px rgba(102, 126, 234, 0.3);
}

.progress-percentage {
    text-align: right;
    font-size: 14px;
    color: #7f8c8d;
    font-weight: 600;
}

.progress-percentage span {
    color: #667eea;
    font-weight: 700;
}

/* ==================== Main Quiz Section ==================== */
.quiz-main {
    flex: 1;
    padding: 40px;
}

/* ==================== Question Card ==================== */
.question-card {
    background: white;
    border-radius: 16px;
    padding: 40px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.question-badge {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.question-timer {
    background: #f8f9fa;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    color: #2c3e50;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.question-timer i {
    color: #667eea;
}

.question-text {
    font-size: 24px;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 30px;
    line-height: 1.5;
}

/* ==================== Options Container ==================== */
.options-container {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 40px;
}

.option {
    position: relative;
}

.option input[type="radio"] {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.option label {
    display: flex;
    align-items: center;
    padding: 20px 24px;
    background: #f8f9fa;
    border: 2px solid #e0e6ed;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.option label:hover {
    background: #f0f3f8;
    border-color: #667eea;
    transform: translateX(4px);
}

.option input[type="radio"]:checked + label {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    border-color: #667eea;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.2);
}

.option-letter {
    width: 40px;
    height: 40px;
    background: #667eea;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 18px;
    margin-right: 16px;
    flex-shrink: 0;
}

.option input[type="radio"]:checked + label .option-letter {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.option-text {
    flex: 1;
    font-size: 16px;
    color: #2c3e50;
    font-weight: 500;
}

.option-check {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: 2px solid #e0e6ed;
    display: flex;
    align-items: center;
    justify-content: center;
    color: transparent;
    transition: all 0.3s ease;
    margin-left: 12px;
}

.option input[type="radio"]:checked + label .option-check {
    background: #667eea;
    border-color: #667eea;
    color: white;
}

/* ==================== Quiz Navigation ==================== */
.quiz-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    margin-top: 40px;
}

.btn-nav {
    padding: 14px 28px;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-previous {
    background: #95a5a6;
    color: white;
}

.btn-previous:hover:not(:disabled) {
    background: #7f8c8d;
    transform: translateX(-4px);
}

.btn-next {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-next:hover:not(:disabled) {
    transform: translateX(4px);
    box-shadow: 0 6px 16px rgba(102, 126, 234, 0.3);
}

.btn-nav:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ==================== Question Dots ==================== */
.question-dots {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: center;
    max-width: 400px;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #e0e6ed;
    cursor: pointer;
    transition: all 0.3s ease;
}

.dot:hover {
    transform: scale(1.3);
}

.dot.answered {
    background: #667eea;
}

.dot.active {
    background: #764ba2;
    transform: scale(1.4);
}

/* ==================== Submit Section ==================== */
.submit-section {
    padding: 40px;
}

.submit-card {
    background: white;
    border-radius: 16px;
    padding: 50px;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.submit-icon {
    font-size: 64px;
    color: #667eea;
    margin-bottom: 20px;
}

.submit-card h2 {
    font-size: 32px;
    color: #2c3e50;
    margin-bottom: 20px;
}

.submit-info {
    font-size: 18px;
    color: #7f8c8d;
    margin-bottom: 10px;
}

.submit-info span {
    color: #667eea;
    font-weight: 700;
}

.submit-warning {
    background: #fff3cd;
    color: #856404;
    padding: 12px 20px;
    border-radius: 8px;
    margin: 20px 0;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-weight: 600;
}

.submit-warning.show {
    display: flex;
}

.submit-card .form-group {
    margin: 20px 0;
    text-align: left;
}

.submit-card label {
    display: block;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 8px;
    font-size: 14px;
}

.submit-card input {
    width: 100%;
    padding: 14px;
    border: 2px solid #e0e6ed;
    border-radius: 10px;
    font-size: 16px;
    transition: border-color 0.3s ease;
}

.submit-card input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.submit-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    align-items: center;
    margin-top: 30px;
    flex-wrap: wrap;
}

.submit-actions .btn-secondary {
    padding: 16px 32px;
    background: #95a5a6;
    color: white;
    border: none;
    font-size: 16px;
}

.submit-actions .btn-secondary:hover {
    background: #7f8c8d;
}

.btn-submit {
    padding: 16px 40px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.3);
}

/* ==================== Footer ==================== */
.quiz-footer {
    background: #f8f9fa;
    padding: 20px;
    text-align: center;
    color: #7f8c8d;
    border-top: 1px solid #e0e6ed;
}

.quiz-footer a {
    color: #667eea;
    text-decoration: none;
    font-weight: 600;
}

.quiz-footer a:hover {
    text-decoration: underline;
}

/* ==================== Responsive Design ==================== */
@media (max-width: 768px) {
    body {
        padding: 0;
    }

    .quiz-container {
        border-radius: 0;
        min-height: 100vh;
    }

    .quiz-header {
        padding: 15px 20px;
    }

    .quiz-header .logo a {
        font-size: 20px;
    }

    .progress-container {
        padding: 20px;
    }

    .quiz-main {
        padding: 20px;
    }

    .question-card {
        padding: 24px;
    }

    .question-text {
        font-size: 20px;
    }

    .quiz-navigation {
        flex-wrap: wrap;
    }

    .question-dots {
        order: 3;
        width: 100%;
        margin-top: 16px;
    }

    .submit-card {
        padding: 30px 20px;
    }

    .submit-card h2 {
        font-size: 24px;
    }

    .submit-actions {
        flex-direction: column;
    }

    .submit-actions button {
        width: 100%;
    }
}