/* ===========================
   HERO SECTION
   =========================== */
.hero {
    display: flex;
    align-items: center;
    gap: var(--space-8);
    padding: var(--space-12) 0 var(--space-8);
    min-height: 85vh;
}

.hero-content {
    flex: 1;
    max-width: 500px;
}

.hero-title {
    font-size: 4.25rem;
    margin-bottom: var(--space-4);
    letter-spacing: -0.02em;
    line-height: 1.08;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-6);
    line-height: 1.6;
    max-width: 95%;
}

.hero-actions {
    display: flex;
    gap: var(--space-3);
}

.hero-visual {
    flex: 1;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Notebook Mockup */
.visual-mockup {
    position: relative;
    width: 100%;
    max-width: 480px;
    transform: rotate(2deg);
    transition: transform 0.6s var(--ease-out-expo);
}

.visual-mockup:hover {
    transform: rotate(0deg) scale(1.02);
}

.notebook {
    background-color: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--space-6);
    border-left: 18px solid #E5DCD0;
    position: relative;
    z-index: 2;
    background-image: linear-gradient(#F3EFE9 1px, transparent 1px);
    background-size: 100% 2.5em;
    background-position: 0 2.5em;
    border: 1px solid rgba(0,0,0,0.04);
    border-left: 18px solid #E5DCD0;
}

.notebook::before {
    content: '';
    position: absolute;
    left: -15px;
    top: 5%;
    bottom: 5%;
    width: 10px;
    background: repeating-linear-gradient(
        to bottom,
        transparent,
        transparent 15px,
        #D2C9B8 15px,
        #D2C9B8 20px
    );
    border-radius: 5px;
}

.notebook-header {
    margin-bottom: var(--space-6);
    background-color: var(--color-surface);
}

.notebook-tag {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
}

.notebook-body {
    background-color: var(--color-surface);
}

.topic-item {
    display: flex;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
    padding-bottom: var(--space-4);
}

.topic-icon {
    width: 40px;
    height: 40px;
    background-color: var(--color-bg);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    flex-shrink: 0;
    border: 1px solid var(--color-border-light);
}

.topic-text h3 {
    font-family: var(--font-sans);
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.topic-text p {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

.notebook-footer {
    margin-top: var(--space-6);
    padding-top: var(--space-4);
    border-top: 1px solid var(--color-border-light);
    display: flex;
    align-items: center;
    gap: var(--space-4);
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.progress-bar {
    flex: 1;
    height: 4px;
    background-color: var(--color-secondary);
    border-radius: 2px;
    overflow: hidden;
}

.progress {
    height: 100%;
    background-color: var(--color-primary);
    transition: width 0.8s var(--ease-out-expo);
}


/* ===========================
   ABOUT SECTION
   =========================== */
.about {
    text-align: center;
    padding: var(--space-6) 0 var(--space-8);
    max-width: 800px;
    margin: 0 auto;
}

.section-title {
    font-size: 2.25rem;
    margin-bottom: var(--space-4);
}

.section-description {
    font-size: 1.35rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}


/* ===========================
   AVAILABLE CONTENT
   =========================== */
.available-content {
    padding: var(--space-6) 0 var(--space-12);
}

.available-content .section-title {
    text-align: center;
    margin-bottom: var(--space-8);
}

.subject-card {
    background-color: var(--color-surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    max-width: 900px;
    margin: 0 auto;
    border: 1px solid var(--color-border-light);
    transition: box-shadow var(--transition-base);
}

.subject-card:hover {
    box-shadow: var(--shadow-lg);
}

.subject-card-header {
    background-color: var(--color-surface);
    padding: var(--space-3) var(--space-4);
    border-bottom: 1px solid var(--color-border-light);
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.mac-buttons {
    display: flex;
    gap: 8px;
}

.mac-btn {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.mac-btn.close { background-color: #FF5F56; }
.mac-btn.minimize { background-color: #FFBD2E; }
.mac-btn.expand { background-color: #27C93F; }

.subject-card-body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
    padding: var(--space-8);
}

.subject-title-wrapper {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.subject-icon {
    width: 56px;
    height: 56px;
    background-color: var(--color-accent-light);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    border: 1px solid var(--color-border-light);
}

.subject-title {
    font-size: 2rem;
}

.subject-description {
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.subject-details {
    display: flex;
    flex-direction: column;
}

.tags {
    display: flex;
    gap: var(--space-2);
    margin-bottom: var(--space-5);
    flex-wrap: wrap;
}

.tag {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.35rem 0.75rem;
    background-color: var(--color-surface-alt);
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border-light);
}

.feature-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
    flex-grow: 1;
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.95rem;
    color: var(--color-text-primary);
}

.feature-list svg {
    color: var(--color-success);
    flex-shrink: 0;
}

.subject-details .btn {
    align-self: flex-end;
}


/* ===========================
   SUBJECT VIEW — UNITS GRID
   =========================== */
.subject-units-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-4);
}

.subject-unit-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-base), transform var(--transition-base);
    display: flex;
    flex-direction: column;
}

.subject-unit-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.subject-unit-header {
    padding: var(--space-4) var(--space-4) var(--space-3);
    border-bottom: 1px solid var(--color-border-light);
}

.subject-unit-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 700;
    color: var(--color-accent);
    display: block;
    margin-bottom: 0.3rem;
}

.subject-unit-title {
    font-family: var(--font-sans);
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--color-text-primary);
    line-height: 1.35;
    margin-bottom: 0.4rem;
}

.subject-unit-meta {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.78rem;
    color: var(--color-text-muted);
}

/* Module list */
.subject-module-list {
    flex: 1;
    padding: var(--space-2) 0;
}

.subject-module-row {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: 0.6rem var(--space-4);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.subject-module-row:hover {
    background-color: var(--color-secondary);
}

.subject-module-row:hover .subject-module-arrow {
    opacity: 1;
    transform: translateX(2px);
}

.subject-module-row:hover .subject-module-num {
    background-color: var(--color-primary);
    color: white;
}

.subject-module-num {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background-color: var(--color-secondary);
    color: var(--color-text-muted);
    font-size: 0.75rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all var(--transition-fast);
}

.subject-module-info {
    flex: 1;
    min-width: 0;
}

.subject-module-name {
    display: block;
    font-size: 0.92rem;
    font-weight: 500;
    color: var(--color-text-primary);
    line-height: 1.3;
}

.subject-module-steps {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.subject-module-arrow {
    width: 16px;
    height: 16px;
    color: var(--color-text-muted);
    opacity: 0;
    flex-shrink: 0;
    transition: all var(--transition-fast);
}

/* Quiz footer */
.subject-unit-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.6rem var(--space-4);
    background: var(--color-accent-light);
    border-top: 1px solid var(--color-border-light);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-accent);
    transition: background-color var(--transition-fast);
}

.subject-unit-footer:hover {
    background-color: #F5E8D4;
}

.subject-unit-footer svg {
    color: var(--color-accent);
}

/* Responsive: stack on mobile */
@media (max-width: 768px) {
    .subject-units-grid {
        grid-template-columns: 1fr;
    }
}

/* ===========================
   FEEDBACK SECTION
   =========================== */
.feedback {
    padding: var(--space-8) 0 var(--space-12);
}

.feedback-card {
    background: linear-gradient(135deg, var(--color-surface-alt) 0%, var(--color-bg) 100%);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
    border: 1px solid var(--color-border-light);
}

.feedback-title {
    font-size: 1.75rem;
    margin-bottom: var(--space-3);
}

.feedback-description {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-6);
    font-size: 1.1rem;
}


/* ===========================
   FOOTER
   =========================== */
footer {
    text-align: center;
    padding: var(--space-8) 0;
    color: var(--color-text-muted);
    font-size: 0.85rem;
    border-top: none;
}


/* ===========================
   STUDY VIEW — FULL LAYOUT
   =========================== */
.study-layout {
    padding-top: var(--space-4);
    padding-bottom: var(--space-12);
}

.study-header {
    margin-bottom: var(--space-5);
    padding-bottom: var(--space-3);
    border-bottom: 1px solid var(--color-border-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.study-grid {
    display: flex;
    gap: var(--space-6);
    align-items: flex-start;
}


/* ===========================
   SIDEBAR — PERSISTENT TREE
   =========================== */
.study-sidebar {
    flex: 0 0 var(--sidebar-width);
    position: sticky;
    top: 80px;
    max-height: calc(100vh - 100px);
    overflow-y: auto;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-light);
    padding: 0;
    scrollbar-width: thin;
    scrollbar-color: var(--color-border) transparent;
}

.study-sidebar::-webkit-scrollbar {
    width: 4px;
}

.study-sidebar::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 4px;
}

/* Sidebar back button */
.sidebar-back {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    border-bottom: 1px solid var(--color-border-light);
    cursor: pointer;
    transition: all var(--transition-fast);
    background: var(--color-surface-alt);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.sidebar-back:hover {
    color: var(--color-primary);
    background: var(--color-primary-light);
}

.sidebar-back svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

/* Unit group */
.sidebar-unit {
    border-bottom: 1px solid var(--color-border-light);
}

.sidebar-unit:last-child {
    border-bottom: none;
}

.sidebar-unit-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3) var(--space-4);
    cursor: pointer;
    transition: all var(--transition-fast);
    user-select: none;
}

.sidebar-unit-header:hover {
    background-color: var(--color-secondary);
}

.sidebar-unit-label {
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    font-weight: 600;
    color: var(--color-text-muted);
}

.sidebar-unit-title {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-primary);
    margin-top: 2px;
    font-family: var(--font-sans);
    line-height: 1.4;
}

.sidebar-unit.active > .sidebar-unit-header .sidebar-unit-label {
    color: var(--color-primary);
}

.sidebar-chevron {
    width: 18px;
    height: 18px;
    color: var(--color-text-muted);
    transition: transform var(--transition-base);
    flex-shrink: 0;
}

.sidebar-unit.expanded .sidebar-chevron {
    transform: rotate(90deg);
}

/* Module list inside unit */
.sidebar-modules {
    display: none;
    padding: 0 var(--space-2) var(--space-2);
}

.sidebar-unit.expanded .sidebar-modules {
    display: block;
}

.sidebar-module-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: 0.55rem var(--space-3);
    margin-left: var(--space-2);
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
    cursor: pointer;
    border-left: 2px solid transparent;
    line-height: 1.4;
}

.sidebar-module-item:hover {
    background-color: var(--color-secondary);
    color: var(--color-text-primary);
}

.sidebar-module-item.active {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    font-weight: 500;
    border-left-color: var(--color-primary);
}

.sidebar-module-num {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-muted);
    min-width: 18px;
    flex-shrink: 0;
}

.sidebar-module-item.active .sidebar-module-num {
    color: var(--color-primary);
}

/* Quiz link in sidebar */
.sidebar-quiz-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: 0.55rem var(--space-3);
    margin: var(--space-1) var(--space-2) var(--space-1);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    color: var(--color-accent);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-weight: 500;
}

.sidebar-quiz-item:hover {
    background-color: var(--color-accent-light);
}

.sidebar-quiz-item svg {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
}


/* ===========================
   STUDY MAIN CONTENT AREA
   =========================== */
.study-main {
    flex: 1;
    min-width: 0;
}

/* Progress bars */
.study-progress-global {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-3);
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.study-progress-global-label {
    white-space: nowrap;
    font-weight: 500;
}

.study-progress-global-bar {
    flex: 1;
    height: 4px;
    background-color: var(--color-secondary);
    border-radius: 2px;
    overflow: hidden;
}

.study-progress-global-fill {
    height: 100%;
    background-color: var(--color-accent);
    transition: width 0.6s var(--ease-out-expo);
    border-radius: 2px;
}

.study-top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-3);
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.study-step-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    background: var(--color-primary-light);
    color: var(--color-primary);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-weight: 500;
    font-size: 0.8rem;
}

.study-progress-container {
    width: 100%;
    height: 5px;
    background-color: var(--color-secondary);
    border-radius: 3px;
    margin-bottom: var(--space-5);
    overflow: hidden;
}

.study-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), #4A9BD9);
    transition: width 0.5s var(--ease-out-expo);
    border-radius: 3px;
}

.study-dots {
    display: flex;
    gap: 5px;
}

.study-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--color-border);
    transition: all var(--transition-base);
}

.study-dot.active {
    background-color: var(--color-primary);
    transform: scale(1.2);
}


/* ===========================
   STUDY CARD
   =========================== */
.study-card {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    padding: var(--space-6) var(--space-8);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border-light);
    min-height: 50vh;
    display: flex;
    flex-direction: column;
}

.study-content-area {
    flex: 1;
}

.study-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--space-6);
    border-top: 1px solid var(--color-border-light);
    padding-top: var(--space-5);
    gap: var(--space-3);
}

.study-actions .btn svg {
    width: 16px;
    height: 16px;
}

/* Completion card */
.study-completion {
    margin-top: var(--space-6);
    background: linear-gradient(135deg, var(--color-success-light) 0%, rgba(255,255,255,0) 100%);
    padding: var(--space-6);
    border-radius: var(--radius-xl);
    text-align: center;
    border: 1px solid rgba(58, 143, 107, 0.15);
}

.study-completion h3 {
    font-family: var(--font-serif);
    margin-bottom: var(--space-2);
    font-size: 1.5rem;
}

.study-completion p {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-4);
    font-size: 1.05rem;
}

.study-completion-actions {
    display: flex;
    gap: var(--space-3);
    justify-content: center;
}

/* Keyboard hint tooltip */
.keyboard-hint {
    position: fixed;
    bottom: var(--space-5);
    right: var(--space-5);
    background: var(--color-text-primary);
    color: white;
    padding: 0.6rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.82rem;
    display: flex;
    align-items: center;
    gap: var(--space-2);
    z-index: 300;
    box-shadow: var(--shadow-lg);
    animation: fadeInUp 0.4s var(--ease-out-expo);
    cursor: pointer;
    transition: opacity var(--transition-base);
}

.keyboard-hint:hover {
    opacity: 0.85;
}

.keyboard-hint kbd {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 22px;
    height: 22px;
    padding: 0 5px;
    background: rgba(255,255,255,0.15);
    border-radius: 4px;
    font-family: var(--font-sans);
    font-size: 0.75rem;
}

.keyboard-hint-close {
    margin-left: var(--space-2);
    opacity: 0.5;
    cursor: pointer;
}

.keyboard-hint-close:hover {
    opacity: 1;
}

@media (max-width: 768px) {
    .keyboard-hint {
        display: none !important;
    }
}


/* ===========================
   MOBILE SIDEBAR DRAWER
   =========================== */
.sidebar-toggle {
    display: none;
    align-items: center;
    gap: var(--space-2);
    padding: 0.5rem 1rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--color-text-primary);
    cursor: pointer;
    font-family: var(--font-sans);
    transition: all var(--transition-fast);
}

.sidebar-toggle:hover {
    background: var(--color-secondary);
}

.sidebar-toggle svg {
    width: 18px;
    height: 18px;
}

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 400;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.sidebar-overlay.active {
    display: block;
    opacity: 1;
}


/* ===========================
   RESPONSIVE
   =========================== */

/* Tablet */
@media (max-width: 1100px) {
    .study-sidebar {
        flex: 0 0 var(--sidebar-width-tablet);
    }
}

/* Mobile */
@media (max-width: 900px) {
    .subject-card-body {
        grid-template-columns: 1fr;
    }
    
    .subject-details .btn {
        align-self: stretch;
    }
    
    .sidebar-toggle {
        display: inline-flex;
    }
    
    .study-grid {
        flex-direction: column;
    }
    
    .study-sidebar {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        width: 300px;
        max-width: 85vw;
        z-index: 500;
        border-radius: 0;
        border: none;
        box-shadow: var(--shadow-xl);
        transform: translateX(-100%);
        transition: transform var(--transition-base);
        max-height: 100vh;
        top: 0;
    }
    
    .study-sidebar.open {
        transform: translateX(0);
    }
    
    .study-card {
        padding: var(--space-5);
    }

    .study-actions {
        flex-direction: column;
        gap: var(--space-2);
    }

    .study-actions .btn {
        width: 100%;
    }
}

@media (max-width: 768px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding-top: var(--space-6);
    }
    
    .hero-content {
        margin: 0 auto;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .hero-title {
        font-size: 2.75rem;
    }

    .visual-mockup {
        transform: none;
        max-width: 100%;
        margin-top: var(--space-6);
    }
    
    .feature-list {
        grid-template-columns: 1fr;
    }

    .study-card {
        padding: var(--space-4);
    }

    .slide-content h3 {
        font-size: 1.5rem;
    }

    .editorial-quote {
        font-size: 1.2rem;
        padding: var(--space-3);
    }
}


/* ===========================
   QUIZ SYSTEM
   =========================== */
.quiz-container {
    max-width: 750px;
    margin: 0 auto;
}

.quiz-progress-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-3);
}

.quiz-score-preview {
    font-size: 0.82rem;
    color: var(--color-text-muted);
    font-weight: 500;
}

.quiz-question-card {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    padding: var(--space-6) var(--space-8);
    border: 1px solid var(--color-border-light);
    box-shadow: var(--shadow-md);
}

.quiz-question-text {
    font-family: var(--font-serif);
    font-size: 1.45rem;
    line-height: 1.45;
    color: var(--color-text-primary);
    margin-bottom: var(--space-6);
    text-align: left;
}

/* Options */
.quiz-options {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.quiz-option {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: 0.85rem var(--space-4);
    background: var(--color-surface);
    border: 2px solid var(--color-border-light);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: left;
    font-family: var(--font-sans);
    font-size: 0.98rem;
    color: var(--color-text-primary);
    line-height: 1.45;
    width: 100%;
}

.quiz-option:hover:not(:disabled) {
    border-color: var(--color-primary);
    background: var(--color-primary-light);
    transform: translateX(4px);
}

.quiz-option:hover:not(:disabled) .quiz-option-letter {
    background: var(--color-primary);
    color: white;
}

.quiz-option-letter {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--color-secondary);
    color: var(--color-text-muted);
    font-size: 0.82rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all var(--transition-fast);
}

.quiz-option-text {
    flex: 1;
}

.quiz-option-icon {
    width: 22px;
    height: 22px;
    flex-shrink: 0;
}

/* Correct state */
.quiz-option-correct {
    border-color: var(--color-success);
    background: var(--color-success-light);
}

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

.quiz-option-correct .quiz-option-icon {
    color: var(--color-success);
}

/* Wrong state */
.quiz-option-wrong {
    border-color: #D94F4F;
    background: rgba(217, 79, 79, 0.06);
}

.quiz-option-wrong .quiz-option-letter {
    background: #D94F4F;
    color: white;
}

.quiz-option-wrong .quiz-option-icon {
    color: #D94F4F;
}

/* Disabled (not selected, not correct) */
.quiz-option-disabled {
    opacity: 0.45;
    cursor: default;
}

/* Feedback */
.quiz-feedback {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-4);
    border-radius: var(--radius-md);
    margin-top: var(--space-4);
    font-size: 0.95rem;
    line-height: 1.5;
}

.quiz-feedback-icon {
    font-size: 1.2rem;
    flex-shrink: 0;
}

.quiz-feedback-correct {
    background: var(--color-success-light);
    color: var(--color-success);
    border: 1px solid rgba(58, 143, 107, 0.2);
}

.quiz-feedback-wrong {
    background: rgba(217, 79, 79, 0.06);
    color: #8B3A3A;
    border: 1px solid rgba(217, 79, 79, 0.15);
}


/* ===========================
   QUIZ RESULTS
   =========================== */
.quiz-results-card {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    border: 1px solid var(--color-border-light);
    box-shadow: var(--shadow-md);
    text-align: center;
}

.quiz-results-score {
    font-family: var(--font-serif);
    font-size: 4rem;
    line-height: 1;
    margin-bottom: var(--space-4);
    color: var(--color-text-primary);
}

.quiz-results-bar-container {
    width: 200px;
    height: 8px;
    background: var(--color-secondary);
    border-radius: 4px;
    margin: 0 auto var(--space-3);
    overflow: hidden;
}

.quiz-results-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-success));
    border-radius: 4px;
    transition: width 0.8s var(--ease-out-expo);
    width: 0%;
}

.quiz-results-percentage {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    font-weight: 500;
    margin-bottom: var(--space-2);
}

/* Review list */
.quiz-review {
    margin-top: var(--space-6);
}

.quiz-review-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-3) 0;
    border-bottom: 1px solid var(--color-border-light);
}

.quiz-review-item:last-child {
    border-bottom: none;
}

.quiz-review-status {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-top: 2px;
}

.quiz-review-status svg {
    width: 14px;
    height: 14px;
}

.quiz-review-status.correct {
    background: var(--color-success-light);
    color: var(--color-success);
}

.quiz-review-status.wrong {
    background: rgba(217, 79, 79, 0.08);
    color: #D94F4F;
}

.quiz-review-content {
    flex: 1;
}

.quiz-review-question {
    font-size: 0.92rem;
    color: var(--color-text-primary);
    line-height: 1.5;
    margin-bottom: 0.25rem;
}

.quiz-review-correct {
    font-size: 0.85rem;
    color: var(--color-success);
    margin: 0;
}

@media (max-width: 768px) {
    .quiz-question-card {
        padding: var(--space-5);
    }

    .quiz-question-text {
        font-size: 1.2rem;
    }

    .quiz-results-score {
        font-size: 3rem;
    }
}