:root {
    --color-primary: #182059;
    --container-max-width: 1400px;
}

.app-wrapper {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: clamp(2rem, 5vw, 3rem) var(--page-padding);
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: clamp(0.8rem, 1vw, 0.875rem);
    color: var(--color-text-muted);
    margin-bottom: clamp(1.5rem, 3vw, 2rem);
}

.back-link:hover {
    color: var(--color-text-main);
}

.page-header {
    margin-bottom: clamp(2rem, 4vw, 3rem);
}

.page-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: -0.02em;
    line-height: 1.1;
    margin-bottom: 0.5rem;
}

.page-subtitle {
    font-size: 0.95rem;
    color: var(--color-text-muted);
}

.pillars-container {
    display: flex;
    flex-direction: column;
    gap: clamp(1.25rem, 3vw, 2rem);
}

.pillars-layout {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.pillar-tabs-wrapper {
    position: sticky;
    top: 0;
    z-index: 40;
    background-color: var(--color-background);
    padding-bottom: 0.75rem;
    margin-bottom: 0.5rem;
    border-bottom: 1px solid var(--color-border);
}

.pillar-tabs {
    display: flex;
    gap: 0.375rem;
    overflow-x: auto;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
    padding: 0.25rem 0;
}

.pillar-tabs::-webkit-scrollbar {
    display: none;
}

.pillar-tab {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
    min-height: 44px;
    padding: 0.625rem 1rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-muted);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 9999px;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.pillar-tab:hover {
    color: var(--hover-on-surface, #ffffff);
    border-color: var(--hover-surface, #182059);
    background-color: var(--hover-surface, #182059);
}

.pillar-tab.active {
    color: var(--color-surface);
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}

.pillar-tab-count {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 1.25rem;
    height: 1.25rem;
    padding: 0 0.35rem;
    font-size: 0.7rem;
    font-weight: 700;
    border-radius: 9999px;
    background-color: rgba(255, 255, 255, 0.2);
    color: inherit;
}

.pillar-tab:not(.active) .pillar-tab-count {
    background-color: var(--color-primary-alpha-10);
    color: var(--color-primary);
}

.pillar-panels {
    flex: 1;
    min-height: 0;
}

.pillar-panel {
    display: none;
}

.pillar-panel.is-active {
    display: block;
    max-height: calc(100vh - 12rem);
    overflow-y: auto;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
    scroll-margin-top: 5rem;
}

@media (max-width: 1024px) {
    .container {
        padding-top: 1.25rem;
        padding-bottom: 1.25rem;
    }

    .pillar-tabs-wrapper {
        top: var(--mobile-header-height);
        margin-left: calc(-1 * var(--page-padding, 1rem));
        margin-right: calc(-1 * var(--page-padding, 1rem));
        padding-left: var(--page-padding, 1rem);
        padding-right: var(--page-padding, 1rem);
    }

    .pillar-panel.is-active {
        max-height: calc(100vh - var(--mobile-header-height) - 6rem);
    }
}

@media (max-width: 480px) {
    .pillar-tab {
        padding: 0.5rem 0.75rem;
        font-size: 0.8rem;
    }

    .pillar-tab-label {
        max-width: 6rem;
        overflow: hidden;
        text-overflow: ellipsis;
    }
}

.pillar-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 0.75rem;
    padding: clamp(1.25rem, 3vw, 2rem);
    transition: border-color var(--transition-normal);
}

.pillar-header {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.icon-wrapper {
    width: clamp(2.5rem, 4vw, 3rem);
    height: clamp(2.5rem, 4vw, 3rem);
    background-color: var(--color-primary-alpha-10);
    color: var(--color-primary);
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.header-text h2 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1.2;
}

.header-text span {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    display: block;
    margin-top: 0.125rem;
}

.pillar-desc {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
    max-width: 600px;
}


.btn-pill {
    padding: clamp(0.5rem, 1.2vw, 0.625rem) clamp(1rem, 2.5vw, 1.25rem);
    font-size: clamp(0.8rem, 1vw, 0.875rem);
    font-weight: 500;
    border-radius: 9999px;
    background-color: var(--color-primary-alpha-10);
    color: var(--color-primary);
    transition: all var(--transition-fast);
}

.btn-pill:hover {
    background-color: var(--hover-surface, #182059);
    color: var(--hover-on-surface, #ffffff);
    border-color: var(--hover-surface, #182059);
}

.action-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
    gap: clamp(0.5rem, 1.5vw, 0.75rem);
}

.grid-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: clamp(0.75rem, 2vw, 1rem);
    border: 1px solid var(--color-border);
    border-radius: 0.5rem;
    background-color: transparent;
    transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}

.grid-card:hover {
    background-color: var(--hover-surface, #182059);
    border-color: var(--hover-surface, #182059);
}

.card-label {
    font-family: monospace;
    font-size: clamp(0.65rem, 0.9vw, 0.75rem);
    color: var(--color-text-muted);
    margin-bottom: 0.25rem;
}

.grid-card:hover .card-label,
.grid-card:hover .card-value {
    color: var(--hover-on-surface, #ffffff);
}

.card-value {
    font-size: clamp(0.85rem, 1.2vw, 0.875rem);
    font-weight: 500;
    color: var(--color-primary);
    transition: color 0.2s ease;
}

@media (max-width: 320px) {
    .action-grid {
        grid-template-columns: 1fr;
    }

    .action-row {
        flex-direction: column;
    }

    .btn-outline,
    .btn-pill {
        width: 100%;
        text-align: center;
    }

    .pillar-header {
        flex-direction: column;
        gap: 0.75rem;
    }
}

.nclex-tabs {
    display: flex;
    gap: 0.25rem;
    margin-bottom: clamp(1.5rem, 3vw, 2.5rem);
    border-bottom: 1px solid var(--color-border);
    overflow-x: auto;
    scrollbar-width: none; 
    -webkit-overflow-scrolling: touch;
}

.nclex-tabs::-webkit-scrollbar {
    display: none;
}

.nclex-tab {
    position: relative;
    padding: 0.75rem clamp(1rem, 2vw, 1.25rem);
    font-size: clamp(0.875rem, 1vw, 1rem);
    font-weight: 500;
    white-space: nowrap;
    color: var(--color-text-muted);
    transition: color 0.2s ease;
    flex-shrink: 0;
}

.nclex-tab:hover {
    color: var(--hover-on-surface, #ffffff);
    background-color: var(--hover-surface, #182059);
    border-color: var(--hover-surface, #182059);
}

.nclex-tab.active {
    color: var(--color-text-main);
}

.nclex-tab.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--color-primary);
}

.nclex-pane {
    display: none;
}

.nclex-pane.active-pane {
    display: block;
}

.nclex-category-list {
    display: flex;
    flex-direction: column;
    gap: clamp(1rem, 2vw, 1.5rem);
}

.nclex-category-card {
    border: 1px solid var(--color-border);
    border-radius: 0.5rem;
    padding: clamp(1.25rem, 2vw, 1.5rem);
    background-color: var(--color-surface);
}

.nclex-category-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--color-text-main);
}

.nclex-links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 280px), 1fr));
    gap: 0.5rem;
}

.nclex-link-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: 0.375rem;
    font-size: 0.85rem;
    color: var(--color-primary);
    transition: border-color var(--transition-fast);
}

.nclex-link-item:hover {
    background-color: var(--hover-surface, #182059);
    border-color: var(--hover-surface, #182059);
    color: var(--hover-on-surface, #ffffff);
}

.nclex-link-item .icon {
    width: 14px;
    height: 14px;
    color: var(--color-text-muted);
    transition: color 0.2s;
}

.nclex-link-item:hover .icon {
    color: var(--hover-on-surface, #ffffff);
}

.nclex-builder-card {
    max-width: 32rem;
    border: 1px solid var(--color-border);
    border-radius: 0.5rem;
    padding: clamp(1.5rem, 3vw, 2rem);
    background-color: var(--color-surface);
}

.nclex-form-group {
    margin-bottom: 1.5rem;
}

.nclex-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.nclex-input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: 0.375rem;
    background-color: var(--color-background);
    font-size: 0.875rem;
    color: var(--color-text-main);
}

.nclex-toggle-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
    border: 1px solid var(--color-border);
    border-radius: 0.375rem;
    margin-bottom: 1.5rem;
}

.nclex-toggle-btn {
    width: 2.5rem;
    height: 1.5rem;
    border-radius: 9999px;
    background-color: var(--color-primary);
    position: relative;
    transition: background-color 0.2s;
}

.nclex-toggle-knob {
    width: 1rem;
    height: 1rem;
    border-radius: 50%;
    background-color: white;
    position: absolute;
    top: 0.25rem;
    left: 0.25rem;
    transform: translateX(1rem); 
    transition: transform 0.2s;
}

.nclex-submit-btn {
    display: block;
    width: 100%;
    text-align: center;
    padding: 0.75rem 1.5rem;
    background-color: var(--color-primary);
    color: white;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: 0.375rem;
    transition: background-color 0.2s;
}

.nclex-submit-btn:hover {
    background-color: var(--hover-surface, #182059);
    color: var(--hover-on-surface, #ffffff);
}
.nclex-pane {
    padding-top: clamp(1rem, 2vw, 1.5rem);
    padding-bottom: clamp(1rem, 2vw, 1.5rem);
}

.subject-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 280px), 1fr));
    gap: clamp(0.75rem, 2vw, 1.5rem);
}

.subject-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 0.75rem;
    padding: clamp(1rem, 2vw, 1.5rem);
    display: flex;
    flex-direction: column;
    transition: background-color var(--transition-normal), border-color var(--transition-normal), color var(--transition-normal);
}

.subject-card:hover {
    background-color: var(--hover-surface, #182059);
    border-color: var(--hover-surface, #182059);
}

.subject-card:hover .card-title,
.subject-card:hover .card-meta,
.subject-card:hover .card-number {
    color: var(--hover-on-surface, #ffffff);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: clamp(0.75rem, 1.5vw, 1rem);
}

.book-icon {
    color: var(--color-text-muted);
    transition: color 0.3s ease;
}

.subject-card:hover .book-icon {
    color: var(--hover-on-surface, #ffffff);
}

.card-number {
    font-family: monospace;
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.card-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 0.25rem;
    line-height: 1.3;
}

.card-meta {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-top: auto;
}

.module-group-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 1rem;
}

.accordion-card {
    padding: 0; 
    overflow: hidden;
}

.accordion-header {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: none;
    border: none;
    min-height: 44px;
    padding: clamp(1rem, 1.5vw, 1.25rem);
    cursor: pointer;
    text-align: left;
    color: var(--color-primary);
    transition: background-color 0.2s ease;
}

.accordion-header:hover {
    background-color: var(--hover-surface, #182059);
    color: var(--hover-on-surface, #ffffff);
}

.accordion-header:hover .accordion-title,
.accordion-header:hover .accordion-icon {
    color: var(--hover-on-surface, #ffffff);
}

.accordion-title {
    font-size: 1.05rem;
    font-weight: 700;
}

.accordion-icon {
    width: 20px;
    height: 20px;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    flex-shrink: 0;
    color: var(--color-text-muted);
}

.accordion-content {
    display: none; 
    padding: 0 clamp(1rem, 1.5vw, 1.25rem) clamp(1rem, 1.5vw, 1.25rem);
}

.accordion-card.is-open .accordion-content {
    display: block;
}

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

.empty-state-text {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    font-style: italic;
}