/* Components CSS */

/* Page Headers */
.page-header {
    margin-bottom: 0.5rem;
}

.page-title {
    font-family: 'Outfit', sans-serif;
    font-size: 2.25rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    margin-bottom: 6px;
    background: linear-gradient(120deg, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.page-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 800px;
    line-height: 1.5;
}

/* Premium Cards */
.card {
    background: var(--card-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 1.75rem;
    transition: all var(--transition-normal);
    box-shadow: var(--glow-shadow);
}

.card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
    box-shadow: 0 12px 30px rgba(0, 242, 254, 0.08);
}

.card.card-thermo:hover {
    border-color: rgba(255, 106, 0, 0.4);
    box-shadow: 0 12px 30px rgba(255, 106, 0, 0.08);
}

.card.card-electricity:hover {
    border-color: rgba(0, 198, 255, 0.4);
    box-shadow: 0 12px 30px rgba(0, 198, 255, 0.08);
}

.card-title {
    font-family: 'Outfit', sans-serif;
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.card-title svg {
    width: 22px;
    height: 22px;
    stroke: var(--color-primary);
}

.card-thermo .card-title svg {
    stroke: var(--color-thermo);
}

.card-electricity .card-title svg {
    stroke: var(--color-electricity);
}

.card-description {
    font-size: 0.925rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1.25rem;
}

/* Interactive Accordions for Theory */
.accordion {
    display: flex;
    flex-direction: column;
    gap: 12px;
    width: 100%;
}

.accordion-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.accordion-item.open {
    border-color: var(--border-hover);
}

.accordion-item.thermo.open {
    border-color: rgba(255, 106, 0, 0.4);
}

.accordion-item.electricity.open {
    border-color: rgba(0, 198, 255, 0.4);
}

.accordion-header {
    padding: 1.25rem 1.5rem;
    background: transparent;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    user-select: none;
}

.accordion-title-container {
    display: flex;
    align-items: center;
    gap: 12px;
}

.accordion-title {
    font-family: 'Outfit', sans-serif;
    font-size: 1.1rem;
    font-weight: 600;
}

.accordion-icon {
    width: 20px;
    height: 20px;
    transition: transform var(--transition-normal);
    stroke: var(--text-secondary);
}

.accordion-item.open .accordion-icon {
    transform: rotate(180deg);
    stroke: var(--color-primary);
}

.accordion-item.thermo.open .accordion-icon {
    stroke: var(--color-thermo);
}

.accordion-item.electricity.open .accordion-icon {
    stroke: var(--color-electricity);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal) cubic-bezier(0, 1, 0, 1), padding var(--transition-normal);
    padding: 0 1.5rem;
}

.accordion-item.open .accordion-content {
    max-height: 2000px; /* high value to allow content expansion */
    transition: max-height var(--transition-normal) cubic-bezier(1, 0, 1, 0), padding var(--transition-normal);
    padding: 0 1.5rem 1.5rem 1.5rem;
    border-top: 1px solid var(--border-color);
}

/* Physics Equations */
.math-formula {
    background: var(--bg-tertiary);
    border-left: 3px solid var(--color-primary);
    padding: 1rem;
    margin: 1rem 0;
    border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
    font-family: 'Fira Code', 'Courier New', Courier, monospace;
    font-size: 1rem;
    overflow-x: auto;
    white-space: nowrap;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.math-formula.thermo {
    border-left-color: var(--color-thermo);
}

.math-formula.electricity {
    border-left-color: var(--color-electricity);
}

.formula-text {
    color: var(--text-primary);
    font-weight: 600;
}

.formula-legend {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Custom Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: var(--border-radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-electricity));
    color: #080810;
    box-shadow: 0 4px 15px rgba(0, 242, 254, 0.2);
}

.btn-primary:hover {
    box-shadow: 0 6px 20px rgba(0, 242, 254, 0.35);
    transform: translateY(-1px);
}

.btn-thermo {
    background: linear-gradient(135deg, var(--color-thermo), #ff3f00);
    color: #ffffff;
    box-shadow: 0 4px 15px rgba(255, 106, 0, 0.25);
}

.btn-thermo:hover {
    box-shadow: 0 6px 20px rgba(255, 106, 0, 0.4);
    transform: translateY(-1px);
}

.btn-electricity {
    background: linear-gradient(135deg, var(--color-electricity), #007aff);
    color: #ffffff;
    box-shadow: 0 4px 15px rgba(0, 198, 255, 0.25);
}

.btn-electricity:hover {
    box-shadow: 0 6px 20px rgba(0, 198, 255, 0.4);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--bg-tertiary);
    border-color: var(--border-color);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: var(--bg-secondary);
    border-color: var(--text-muted);
}

/* Custom Form Controls */
.control-group {
    margin-bottom: 1.25rem;
}

.control-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text-secondary);
}

.range-slider-container {
    display: flex;
    align-items: center;
    gap: 12px;
}

.range-slider {
    flex-grow: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    border-radius: 3px;
    background: var(--bg-tertiary);
    outline: none;
}

.range-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--color-primary);
    cursor: pointer;
    box-shadow: 0 0 10px rgba(0, 242, 254, 0.5);
    transition: transform 0.1s ease;
}

.range-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.thermo-controls .range-slider::-webkit-slider-thumb {
    background: var(--color-thermo);
    box-shadow: 0 0 10px rgba(255, 106, 0, 0.5);
}

.electricity-controls .range-slider::-webkit-slider-thumb {
    background: var(--color-electricity);
    box-shadow: 0 0 10px rgba(0, 198, 255, 0.5);
}

.slider-value {
    font-family: 'Fira Code', monospace;
    font-size: 0.85rem;
    font-weight: 600;
    min-width: 60px;
    text-align: right;
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 30px;
}

.badge-thermo {
    background: rgba(255, 106, 0, 0.1);
    color: var(--color-thermo);
    border: 1px solid rgba(255, 106, 0, 0.2);
}

.badge-electricity {
    background: rgba(0, 198, 255, 0.1);
    color: var(--color-electricity);
    border: 1px solid rgba(0, 198, 255, 0.2);
}

/* Solved Problems styling */
.problems-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.problem-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 1.5rem;
    transition: all var(--transition-normal);
}

.problem-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
}

.problem-number {
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--color-primary);
}

.problem-card.thermo .problem-number { color: var(--color-thermo); }
.problem-card.electricity .problem-number { color: var(--color-electricity); }

.problem-statement {
    font-weight: 500;
    line-height: 1.5;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.problem-solution-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 8px 16px;
    font-size: 0.8rem;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.problem-solution-btn:hover {
    color: var(--text-primary);
    border-color: var(--text-muted);
    background: rgba(255, 255, 255, 0.02);
}

.problem-solution {
    display: none;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px dashed var(--border-color);
    line-height: 1.6;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.problem-solution.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

/* Fade in animation */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Quiz UI Components */
.quiz-container {
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
}

.quiz-progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 2rem;
}

.quiz-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-electricity));
    width: 0%;
    transition: width var(--transition-normal);
}

.quiz-question-box {
    margin-bottom: 2rem;
}

.quiz-question-num {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.quiz-question-text {
    font-family: 'Outfit', sans-serif;
    font-size: 1.35rem;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.quiz-option {
    display: flex;
    align-items: center;
    gap: 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 14px 20px;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all var(--transition-fast);
    text-align: left;
}

.quiz-option:hover {
    border-color: var(--border-hover);
    background: rgba(255, 255, 255, 0.01);
}

.quiz-option-letter {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.85rem;
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.quiz-option:hover .quiz-option-letter {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.quiz-option.selected {
    border-color: var(--color-primary);
    background: rgba(0, 242, 254, 0.05);
}

.quiz-option.selected .quiz-option-letter {
    background: var(--color-primary);
    color: #080810;
    border-color: var(--color-primary);
    box-shadow: 0 0 10px rgba(0, 242, 254, 0.3);
}

.quiz-option.correct {
    border-color: var(--color-success);
    background: rgba(16, 185, 129, 0.08);
}

.quiz-option.correct .quiz-option-letter {
    background: var(--color-success);
    color: white;
    border-color: var(--color-success);
}

.quiz-option.wrong {
    border-color: var(--color-danger);
    background: rgba(239, 68, 68, 0.08);
}

.quiz-option.wrong .quiz-option-letter {
    background: var(--color-danger);
    color: white;
    border-color: var(--color-danger);
}

.quiz-explanation {
    margin-top: 1.5rem;
    padding: 1.25rem;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    line-height: 1.5;
    font-size: 0.9rem;
    color: var(--text-secondary);
    display: none;
}

.quiz-explanation.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

/* Certificate component */
.certificate-card {
    background: linear-gradient(145deg, #101026, #1b1b3d);
    border: 6px double rgba(0, 242, 254, 0.3);
    border-radius: var(--border-radius-lg);
    padding: 3.5rem 2rem;
    text-align: center;
    position: relative;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

[data-theme="light"] .certificate-card {
    background: linear-gradient(145deg, #ffffff, #f0f4f8);
    border: 6px double rgba(0, 136, 204, 0.4);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
}

.cert-stamp {
    position: absolute;
    top: 2rem;
    right: 2rem;
    width: 80px;
    height: 80px;
    border: 2px dashed var(--color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: rotate(15deg);
    font-family: 'Outfit', sans-serif;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--color-primary);
    text-transform: uppercase;
}

.cert-title {
    font-family: 'Outfit', sans-serif;
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: 1px;
    margin-bottom: 0.5rem;
    color: var(--color-primary);
}

.cert-subtitle {
    font-size: 0.85rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
}

.cert-awarded {
    font-size: 1.1rem;
    font-style: italic;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.cert-name {
    font-family: 'Outfit', sans-serif;
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    display: inline-block;
    padding-bottom: 8px;
    margin-bottom: 1.5rem;
    min-width: 300px;
}

.cert-text {
    font-size: 1rem;
    max-width: 550px;
    margin: 0 auto 3rem auto;
    line-height: 1.6;
    color: var(--text-secondary);
}

.cert-meta {
    display: flex;
    justify-content: space-around;
    align-items: center;
    max-width: 600px;
    margin: 0 auto;
}

.cert-sign {
    border-top: 1px solid var(--border-color);
    padding-top: 8px;
    width: 150px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.cert-sign-img {
    font-family: 'Fira Code', monospace;
    font-size: 1rem;
    font-style: italic;
    margin-bottom: 6px;
    color: var(--text-primary);
}

/* CSS Print Styles */
@media print {
    body * {
        visibility: hidden;
    }
    .certificate-card, .certificate-card * {
        visibility: visible;
    }
    .certificate-card {
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        border: 4px double #333;
        box-shadow: none;
        background: white !important;
        color: black !important;
    }
}

/* Sub-tab content toggles */
.thermo-tab-content,
.elec-tab-content,
.mech-tab-content,
.optics-tab-content,
.lab-tab-content {
    display: none;
    width: 100%;
}

.thermo-tab-content.active,
.elec-tab-content.active,
.mech-tab-content.active,
.optics-tab-content.active,
.lab-tab-content.active {
    display: block;
    animation: fadeIn 0.4s ease;
}