/* ============================================
   EDITORIAL BLACK & WHITE - SECONDARY PAGES
   Beginner Kit, Weekly Challenge, Coding Test
   4 Colors: #000000, #8C8889, #CFCFD3, #FFFFFF
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

:root {
    --black: #000000;
    --slate: #8C8889;
    --pearl: #CFCFD3;
    --white: #FFFFFF;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--white);
    color: var(--black);
    line-height: 1.7;
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
}

/* ==========================================
   HEADER - SPLIT DESIGN
   ========================================== */
header {
    position: relative;
    min-height: 200px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 50px 30px 40px;
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 50%;
    height: 100%;
    background: var(--white);
    z-index: 0;
}

header::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: var(--black);
    z-index: 0;
}

header h1 {
    position: relative;
    z-index: 1;
    font-size: 2.2rem;
    font-weight: 900;
    letter-spacing: 4px;
    text-transform: uppercase;
    text-align: center;
    margin-bottom: 15px;
    background: linear-gradient(90deg, var(--black) 50%, var(--white) 50%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

header p {
    position: relative;
    z-index: 2;
    background: var(--black);
    color: var(--white);
    padding: 12px 25px;
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 2px;
    text-transform: uppercase;
    text-align: center;
    max-width: 500px;
    margin-bottom: 20px;
}

.back-link {
    position: relative;
    z-index: 2;
    display: inline-block;
    background: var(--white);
    color: var(--black);
    padding: 10px 20px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    text-decoration: none;
    border: 3px solid var(--black);
    transition: all 0.2s ease;
}

.back-link:hover {
    background: var(--black);
    color: var(--white);
}

/* ==========================================
   CONTAINER
   ========================================== */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0;
}

main {
    padding: 0;
}

/* ==========================================
   SECTIONS
   ========================================== */
section, .section-light, .section-dark {
    padding: 3rem;
    border-bottom: 4px solid var(--black);
}

section:last-child {
    border-bottom: none;
}

.section-light {
    background: var(--white);
    color: var(--black);
}

.section-dark {
    background: var(--black);
    color: var(--white);
}

section h2 {
    font-size: 1.1rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 3px;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 3px solid currentColor;
    display: flex;
    align-items: center;
    gap: 12px;
}

section h2 i {
    font-size: 1.2rem;
}

section p {
    font-size: 0.95rem;
    line-height: 1.8;
    margin-bottom: 1rem;
}

section ul, section ol {
    margin-left: 1.5rem;
    margin-bottom: 1.5rem;
}

section li {
    margin-bottom: 0.75rem;
    line-height: 1.7;
}

section a {
    color: inherit;
    font-weight: 600;
    text-decoration: underline;
}

.section-dark a {
    color: var(--pearl);
}

/* ==========================================
   QUIZ STYLES
   ========================================== */
.quiz-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0;
}

.quiz-header {
    background: var(--black);
    color: var(--white);
    padding: 2rem 3rem;
    text-align: center;
    border-bottom: 4px solid var(--pearl);
}

.quiz-header h1 {
    font-size: 1.8rem;
    font-weight: 900;
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
    background: none;
    -webkit-text-fill-color: var(--white);
}

.quiz-header p {
    color: var(--pearl);
    font-size: 0.85rem;
    background: none;
    padding: 0;
    margin: 0;
    text-transform: none;
    letter-spacing: 0;
}

/* Progress Bar */
.progress-bar {
    height: 6px;
    background: var(--pearl);
    margin: 0;
}

.progress-fill {
    height: 100%;
    background: var(--black);
    transition: width 0.3s ease;
}

/* Question Card */
.question-container {
    background: var(--white);
    padding: 3rem;
    border: 4px solid var(--black);
    border-top: none;
}

.question-card h2 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--black);
    margin-bottom: 2rem;
    line-height: 1.6;
    border-bottom: none;
    padding-bottom: 0;
}

/* Answer Options */
.answer-option {
    display: block;
    width: 100%;
    padding: 1.25rem 1.5rem;
    margin-bottom: 1rem;
    background: var(--white);
    border: 3px solid var(--black);
    color: var(--black);
    font-size: 0.95rem;
    font-weight: 500;
    text-align: left;
    cursor: pointer;
    transition: all 0.2s ease;
}

.answer-option:hover {
    background: var(--pearl);
}

.answer-option.selected {
    background: var(--black);
    color: var(--white);
}

.answer-option.correct {
    background: var(--black);
    color: var(--white);
    border-color: var(--black);
}

.answer-option.incorrect {
    background: var(--slate);
    color: var(--white);
    border-color: var(--slate);
}

/* Buttons */
button, .btn {
    background: var(--black);
    color: var(--white);
    border: 3px solid var(--black);
    padding: 1rem 2rem;
    font-size: 0.8rem;
    font-weight: 800;
    letter-spacing: 2px;
    text-transform: uppercase;
    cursor: pointer;
    transition: all 0.2s ease;
}

button:hover, .btn:hover {
    background: var(--white);
    color: var(--black);
}

button:disabled {
    background: var(--pearl);
    border-color: var(--pearl);
    color: var(--slate);
    cursor: not-allowed;
}

/* Results */
.results-container {
    background: var(--black);
    color: var(--white);
    padding: 3rem;
    text-align: center;
}

.results-container h2 {
    font-size: 1.5rem;
    font-weight: 900;
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 1rem;
    border-bottom: none;
    justify-content: center;
}

.score-display {
    font-size: 4rem;
    font-weight: 900;
    margin: 2rem 0;
    color: var(--white);
}

.score-message {
    font-size: 1rem;
    color: var(--pearl);
    margin-bottom: 2rem;
}

/* Certificate */
.certificate-container {
    background: var(--white);
    border: 4px solid var(--black);
    padding: 3rem;
    margin: 2rem 0;
}

.certificate {
    text-align: center;
    padding: 2rem;
    border: 2px solid var(--black);
}

.certificate h3 {
    font-size: 1.5rem;
    font-weight: 900;
    letter-spacing: 4px;
    text-transform: uppercase;
    margin-bottom: 1rem;
    color: var(--black);
}

.certificate-name {
    font-size: 2rem;
    font-weight: 700;
    color: var(--black);
    margin: 1.5rem 0;
    padding: 1rem;
    border-top: 2px solid var(--black);
    border-bottom: 2px solid var(--black);
}

.certificate-details {
    font-size: 0.9rem;
    color: var(--slate);
    line-height: 1.8;
}

/* ==========================================
   TOOL GRID (for beginner kit)
   ========================================== */
.tool-grid, .tools-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0;
}

.tool-item, .tool-card {
    background: var(--white);
    border: 1px solid var(--pearl);
    border-right: 2px solid var(--black);
    border-bottom: 2px solid var(--black);
    padding: 1.5rem;
    transition: all 0.2s ease;
}

.tool-item:hover, .tool-card:hover {
    background: var(--black);
    color: var(--white);
}

.tool-item h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.tool-item p {
    font-size: 0.85rem;
    color: var(--slate);
    margin-bottom: 0;
}

.tool-item:hover p {
    color: var(--pearl);
}

.tool-item a {
    color: var(--black);
    font-weight: 600;
}

.tool-item:hover a {
    color: var(--white);
}

/* ==========================================
   TIPS / CALLOUTS
   ========================================== */
.tip, .note, .warning {
    background: var(--pearl);
    border-left: 4px solid var(--black);
    padding: 1.25rem 1.5rem;
    margin: 1.5rem 0;
    font-size: 0.9rem;
}

.tip strong, .note strong {
    display: block;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.5rem;
}

/* ==========================================
   FOOTER
   ========================================== */
footer {
    background: var(--black);
    color: var(--slate);
    padding: 2rem;
    text-align: center;
    font-size: 0.75rem;
    letter-spacing: 2px;
    text-transform: uppercase;
}

footer a {
    color: var(--white);
}

/* ==========================================
   RESPONSIVE
   ========================================== */
@media (max-width: 768px) {
    header {
        min-height: 180px;
        padding: 40px 20px 30px;
    }
    
    header h1 {
        font-size: 1.4rem;
        letter-spacing: 2px;
    }
    
    header p {
        font-size: 0.6rem;
        padding: 10px 15px;
        letter-spacing: 1px;
    }
    
    section, .section-light, .section-dark {
        padding: 2rem 1.5rem;
    }
    
    section h2 {
        font-size: 0.95rem;
        letter-spacing: 2px;
    }
    
    .tool-grid, .tools-grid {
        grid-template-columns: 1fr;
    }
    
    .quiz-header {
        padding: 1.5rem;
    }
    
    .quiz-header h1 {
        font-size: 1.3rem;
    }
    
    .question-container {
        padding: 2rem 1.5rem;
    }
    
    .results-container {
        padding: 2rem 1.5rem;
    }
    
    .score-display {
        font-size: 3rem;
    }
}