/* Reset and Base Styles */
*,
*:before,
*:after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Color Variables */
:root {
    --color-bg-primary: #121212;
    --color-bg-secondary: #1e1e1e;
    --color-bg-tertiary: #252525;
    --color-bg-hover: #2c2c2c;
    --color-border: #333;
    --color-text-primary: #e6edf3;
    --color-text-secondary: #c9d1d9;
    --color-accent-blue: #58a6ff;
    --color-accent-green: #238636;
    --color-accent-green-hover: #2ea043;
    --color-accent-yellow: #ffeb3b;
    
    /* Spacing Variables */
    --space-xs: 0.5rem;
    --space-sm: 0.75rem;
    --space-md: 1rem;
    --space-lg: 1.25rem;
    --space-xl: 1.5rem;
    --space-xxl: 2rem;
    
    /* Shadow Variables */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.2);
    
    /* Border Radius Variables */
    --radius-sm: 4px;
    --radius-md: 8px;
}

/* Body and Layout */
html,
body {
    height: 100%;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    overflow-x: hidden;
}

.content {
    flex: 1;
    padding: var(--space-xl);
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
}

/* Header Styles */
header {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-md) var(--space-xl);
    background-color: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    position: relative;
    min-height: 70px;
    width: 100%;
}

.home-btn {
    background-color: var(--color-accent-green);
    color: #fff;
    padding: 0.625rem 1.25rem;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.2s ease;
    z-index: 1;
    position: absolute;
    left: var(--space-xl);
    top: 50%;
    transform: translateY(-50%);
}

.home-btn:hover {
    background-color: var(--color-accent-green-hover);
}

header h3 {
    font-size: 1.75rem;
    color: var(--color-text-primary);
    margin: 0 auto;
    text-align: center;
    padding: 0 4rem;
    max-width: 100%;
    overflow-wrap: break-word;
}

/* Header QUestion Papers */
.qp-btn {
    background-color: var(--color-accent-blue);
    color: #fff;
    padding: 0.625rem 1.25rem;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.2s ease;
    z-index: 1;
    position: absolute;
    right: var(--space-xl);
    top: 50%;
    transform: translateY(-50%);
}

.qp-btn:hover {
    background-color: var(--color-accent-blue);
}

/* Mobile responsive fix */
@media (max-width: 768px) {
    .home-btn {
        position: static;
        transform: none;
        margin-right: 0.5rem;
    }
    .qp-btn {
        position: static;
        transform: none;
        margin-left: 0.5rem;
    }
    header div {
        display: flex;
        justify-content: space-between;
        align-items: center;
    }
}


/* Typography */
h1, h2, h3, h4, h5, h6 {
    line-height: 1.3;
    margin-bottom: var(--space-md);
    color: var(--color-text-primary);
}

p {
    margin-bottom: var(--space-md);
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--color-accent-blue);
}

.answer-box h3[id^="questionText"] {
    font-size: 1.1rem;
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-text-primary);
    margin-top: 0;
    margin-bottom: var(--space-sm);
    padding: 0 var(--space-sm);
    text-align: left;
    overflow-wrap: break-word;
    word-wrap: break-word;
}

/* Button Styles */
.btn {
    display: inline-block;
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    outline: none;
}

.btn-primary {
    background-color: var(--color-accent-green);
    color: #fff;
}

.btn-primary:hover {
    background-color: var(--color-accent-green-hover);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid;
}

.btn-blue {
    color: var(--color-accent-blue);
    border-color: var(--color-accent-blue);
}

.btn-blue:hover {
    color: #fff;
    background-color: var(--color-accent-blue);
}

.btn-green {
    color: var(--color-accent-green);
    border-color: var(--color-accent-green);
}

.btn-green:hover {
    color: #fff;
    background-color: var(--color-accent-green);
}

.view-code-btn {
    display: inline-block;
    padding: 0.625rem 1rem;
    border: 2px solid var(--color-accent-blue);
    border-radius: var(--radius-sm);
    background-color: transparent;
    color: var(--color-accent-blue);
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s ease;
    outline: none;
    position: relative;
    overflow: hidden;
    cursor: pointer;
    margin-right: var(--space-xs);
    margin-bottom: var(--space-xs);
}

.view-code-btn:hover {
    color: #fff;
    background-color: var(--color-accent-blue);
}

.download-code-btn {
    display: inline-block;
    padding: 0.625rem 1rem;
    border: 2px solid var(--color-accent-green);
    border-radius: var(--radius-sm);
    background-color: transparent;
    color: var(--color-accent-green);
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s ease;
    outline: none;
    position: relative;
    overflow: hidden;
    cursor: pointer;
    margin-right: var(--space-xs);
    margin-bottom: var(--space-xs);
}

.download-code-btn:hover {
    color: #fff;
    background-color: var(--color-accent-green);
}

.see-all-btn {
    display: inline-block;
    padding: 0.625rem 1.25rem;
    background-color: transparent;
    color: var(--color-accent-blue);
    text-decoration: none;
    border: 2px solid var(--color-accent-blue);
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.875rem;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.see-all-btn:hover {
    background-color: var(--color-accent-blue);
    color: #fff;
}

/* Question and Content Styles */
.question-item {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-xl);
    margin-bottom: var(--space-lg);
    box-shadow: var(--shadow-sm);
}

.question-item h1 {
    font-size: 1.1rem;
    color: var(--color-text-primary);
    margin-bottom: 0.9375rem;
    font-weight: normal;
    display: block;
    line-height: 1.5;
    cursor: pointer;
}

.question-item h1:hover {
    color: var(--color-accent-blue);
}

.question-link {
    text-decoration: none;
    color: inherit;
}

.question-item ol,
.question-item ul {
    margin-left: var(--space-lg);
    margin-bottom: 0.9375rem;
}

.question-item li {
    margin-bottom: var(--space-xs);
    color: var(--color-text-secondary);
}

/* Info and Note Styles */
.info-box {
    background-color: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-sm);
    padding: var(--space-md);
    display: inline-flex;
    align-items: center;
    flex-wrap: wrap;
    max-width: 90%;
    margin: var(--space-xs) 0;
}

.info-box p {
    margin: 0;
    color: var(--color-accent-yellow);
    font-size: 0.875rem;
    line-height: 1.4;
}

.info-box a {
    color: var(--color-accent-yellow);
    text-decoration: none;
    font-weight: 600;
    padding: 0.125rem 0.25rem;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
}

.info-box a:hover {
    background-color: var(--color-accent-yellow);
    color: #000;
    cursor: pointer;
}

.multiple-solutions-note {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    margin-top: var(--space-sm);
    margin-bottom: var(--space-sm);
    font-style: italic;
    line-height: 1.4;
    clear: both;
}

/* Image Styles */
.image-section {
    margin: var(--space-lg) 0;
    text-align: start;
}

.image-section img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}

/* Group and Section Styles */
.group h3 {
    font-size: 1.4rem;
    margin: var(--space-md) 0;
    color: #e0e0e0;
    font-weight: 500;
    text-align: left;
    border-left: 4px solid #2d76cc;
    padding-left: 10px;
}

.other-questions {
    margin-top: var(--space-xxl);
    padding: var(--space-xl);
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.other-questions-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-lg);
    flex-wrap: wrap;
    gap: var(--space-md);
}

.other-questions h3 {
    font-size: 1.25rem;
    color: var(--color-text-primary);
    font-weight: 600;
    margin: 0;
}

.questions-list {
    list-style-type: none;
    padding: 0;
    margin-top: var(--space-md);
    border-top: 1px solid var(--color-border);
    padding-top: var(--space-sm);
}

.questions-list li {
    padding: var(--space-sm) var(--space-md);
    margin: var(--space-xs) 0;
    border-radius: var(--radius-sm);
    background-color: var(--color-bg-tertiary);
    transition: all 0.2s ease;
}

.questions-list li:hover {
    background-color: var(--color-bg-hover);
    transform: translateX(5px);
}

.questions-list li a {
    text-decoration: none;
    color: var(--color-text-primary);
    font-weight: 500;
    transition: color 0.2s ease;
    display: block;
}

.questions-list li a:hover {
    color: var(--color-accent-blue);
}

/* Responsive Styles */
@media (max-width: 992px) {
    .content {
        padding: var(--space-md);
    }
}

@media (max-width: 768px) {
    :root {
        --space-xl: 1.25rem;
        --space-xxl: 1.5rem;
    }
    
    header {
        padding: var(--space-md);
        align-items: center;
        justify-content: space-between;
        flex-wrap: wrap;
        gap: var(--space-xs);
        min-height: 90px;
    }

    .home-btn {
        position: static;
        transform: none;
        margin: 0;
        padding: var(--space-xs) var(--space-md);
        font-size: 0.9375rem;
        width: auto;
    }

    header h3 {
        font-size: 1.25rem;
        padding: 0;
        margin: 0;
        text-align: center;
        width: 100%;
        overflow-wrap: break-word;
        line-height: 1.3;
    }

    .question-item {
        padding: var(--space-lg);
    }
    
    .other-questions {
        padding: var(--space-lg);
    }
    
    .other-questions-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-sm);
    }
    
    .other-questions h3 {
        font-size: 1.1rem;
    }
    
    .see-all-btn {
        width: 100%;
        text-align: center;
    }
    
    .questions-list li {
        padding: 0.625rem 0.875rem;
    }
}

@media (max-width: 480px) {
    header {
        min-height: 100px;
        padding: var(--space-sm);
    }

    header h3 {
        font-size: 1rem;
    }

    .home-btn {
        width: 100%;
        text-align: center;
        padding: var(--space-xs) 0.875rem;
    }

    .question-item {
        padding: var(--space-md);
    }
    
    .other-questions {
        padding: var(--space-md);
    }
    
    .btn {
        display: block;
        width: 100%;
        margin-bottom: var(--space-xs);
    }
    
    .view-code-btn,
    .download-code-btn {
        display: block;
        width: 100%;
        margin-right: 0;
    }
}