/* ============================================
   Why SoSheets - Modular CSS (BEM)
   Brand Color: #217346
   ============================================ */

:root {
    /* Brand Colors */
    --brand-primary: #217346;
    --brand-dark: #1a5d38;
    --brand-darker: #134529;
    --brand-light: #2d9a5f;
    --brand-lighter: #e8f5ee;
    --brand-pale: #f0f9f4;
    
    /* Neutral Colors */
    --color-bg: #f9f9f9;
    --color-white: #ffffff;
    --color-text: #333333;
    --color-text-light: #666666;
    --color-text-lighter: #999999;
    --color-border: #e0e0e0;
    --color-shadow: rgba(0, 0, 0, 0.1);
    --color-shadow-hover: rgba(0, 0, 0, 0.15);
    
    /* Typography */
    --font-family: 'Inter', 'Open Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Layout */
    --max-width: 960px;
    --sidebar-width: 260px;
    --border-radius: 8px;
    
    /* Transitions */
    --transition-speed: 0.3s;
}

/* ============================================
   Reset & Base Styles
   ============================================ */

body {
    margin: 0;
    padding: 0;
    background-color: var(--color-bg);
    padding-top: 80px; /* Push content below fixed nav */
}

.why_sosheets * {
    box-sizing: border-box;
}

.why_sosheets {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--color-text);
    background-color: var(--color-bg);
    min-height: calc(100vh - 80px); /* Account for nav header */
    display: flex;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    margin: 0 auto;
    max-width: 1400px; /* Center the entire layout */
}

.why_sosheets h1,
.why_sosheets h2,
.why_sosheets h3,
.why_sosheets h4 {
    font-weight: 700;
    line-height: 1.3;
    margin-top: 0;
}

.why_sosheets p {
    margin: 0 0 var(--spacing-sm) 0;
}

.why_sosheets ul {
    margin: 0 0 var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
}

.why_sosheets li {
    margin-bottom: var(--spacing-xs);
}

.why_sosheets a {
    color: var(--brand-primary);
    text-decoration: none;
    transition: color var(--transition-speed);
}

.why_sosheets a:hover {
    color: var(--brand-dark);
}

.why_sosheets strong {
    font-weight: 600;
    color: var(--color-text);
}

/* ============================================
   Sidebar Navigation
   ============================================ */

.why_sosheets__sidebar {
    position: sticky;
    top: var(--spacing-lg);
    width: var(--sidebar-width);
    height: fit-content;
    max-height: calc(100vh - 4rem);
    overflow-y: auto;
    background: var(--color-white);
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px var(--color-shadow);
    padding: var(--spacing-md);
    flex-shrink: 0;
}

.why_sosheets__sidebar-inner {
    position: relative;
}

.why_sosheets__sidebar-title {
    font-size: 1.25rem;
    color: var(--brand-primary);
    margin: 0 0 var(--spacing-md) 0;
    padding-bottom: var(--spacing-xs);
    border-bottom: 3px solid var(--brand-primary);
}

.why_sosheets__nav-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.why_sosheets__nav-list li {
    margin-bottom: 0;
}

.why_sosheets__nav-link {
    display: block;
    padding: var(--spacing-xs) var(--spacing-sm);
    color: var(--color-text);
    font-size: 0.9rem;
    border-left: 3px solid transparent;
    transition: all var(--transition-speed);
    margin-bottom: 0.25rem;
    border-radius: 4px;
}

.why_sosheets__nav-link:hover {
    background: var(--brand-pale);
    color: var(--brand-primary);
    border-left-color: var(--brand-light);
}

.why_sosheets__nav-link.active {
    background: var(--brand-lighter);
    color: var(--brand-primary);
    border-left-color: var(--brand-primary);
    font-weight: 600;
}

/* ============================================
   Main Content Area
   ============================================ */

.why_sosheets__content {
    flex: 1;
    max-width: var(--max-width);
    min-width: 0;
    margin: 0 auto; /* Center the content */
}

/* ============================================
   Introduction Section
   ============================================ */

.why_sosheets__intro {
    background: var(--color-white);
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px var(--color-shadow);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    opacity: 0;
    animation: fadeInUp 0.6s ease-out forwards;
}

.why_sosheets__main-title {
    font-size: 2.25rem;
    color: var(--brand-primary);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 4px solid var(--brand-primary);
    line-height: 1.2;
}

.intro__section {
    margin-bottom: var(--spacing-xl);
}

.intro__section:last-child {
    margin-bottom: 0;
}

.intro__heading {
    font-size: 1.75rem;
    color: var(--brand-dark);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.intro__list {
    background: var(--brand-pale);
    border-left: 4px solid var(--brand-primary);
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) var(--spacing-xl);
    border-radius: 4px;
    margin-bottom: var(--spacing-md);
}

.intro__list li {
    color: var(--color-text);
}

.intro__callout {
    background: var(--brand-lighter);
    border-left: 4px solid var(--brand-primary);
    padding: var(--spacing-md);
    border-radius: 4px;
    font-weight: 600;
    color: var(--brand-dark);
}

/* ============================================
   Lessons Overview Section
   ============================================ */

.lessons_overview {
    background: var(--color-white);
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px var(--color-shadow);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    opacity: 0;
    animation: fadeInUp 0.6s ease-out 0.1s forwards;
}

.lessons_overview__title {
    font-size: 2rem;
    color: var(--brand-primary);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 3px solid var(--brand-primary);
}

.lessons_overview__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.lessons_overview__card {
    background: var(--brand-pale);
    border: 2px solid var(--brand-lighter);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    transition: all var(--transition-speed);
}

.lessons_overview__card:hover {
    border-color: var(--brand-primary);
    box-shadow: 0 4px 12px var(--color-shadow);
    transform: translateY(-2px);
}

.lessons_overview__card h3 {
    font-size: 1.1rem;
    color: var(--brand-primary);
    margin-bottom: var(--spacing-sm);
}

.lessons_overview__card p {
    font-size: 0.95rem;
    color: var(--color-text-light);
    margin-bottom: 0;
}

.lessons_overview__appendix {
    background: var(--brand-lighter);
    border: 2px solid var(--brand-primary);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
}

.lessons_overview__appendix h3 {
    font-size: 1.2rem;
    color: var(--brand-dark);
    margin-bottom: var(--spacing-sm);
}

.lessons_overview__appendix p {
    color: var(--color-text-light);
    margin-bottom: 0;
}

/* ============================================
   Lesson Cards
   ============================================ */

.lesson__card {
    background: var(--color-white);
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px var(--color-shadow);
    margin-bottom: var(--spacing-lg);
    overflow: hidden;
    opacity: 0;
    transition: all var(--transition-speed);
}

.lesson__card.visible {
    animation: fadeInUp 0.6s ease-out forwards;
}

.lesson__header {
    background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-dark) 100%);
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    user-select: none;
    transition: background var(--transition-speed);
}

.lesson__header:hover {
    background: linear-gradient(135deg, var(--brand-dark) 0%, var(--brand-darker) 100%);
}

.lesson__title {
    color: var(--color-white);
    font-size: 1.5rem;
    margin: 0;
}

.lesson__toggle {
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid var(--color-white);
    border-radius: 50%;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-speed);
    flex-shrink: 0;
}

.lesson__toggle:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

.lesson__toggle-icon {
    color: var(--color-white);
    font-size: 1.5rem;
    font-weight: bold;
    line-height: 1;
    transition: transform var(--transition-speed);
}

.lesson__toggle-icon i {
    color: var(--color-white);
}

.lesson__card.collapsed .lesson__toggle-icon {
    transform: scale(0.9);
    opacity: 0.8;
}

.lesson__content {
    padding: var(--spacing-xl);
    max-height: 10000px;
    overflow: hidden;
    transition: max-height 0.5s ease-out, padding 0.3s ease-out;
}

.lesson__card.collapsed .lesson__content {
    max-height: 0;
    padding-top: 0;
    padding-bottom: 0;
}

.lesson__intro {
    font-size: 1.1rem;
    color: var(--color-text-light);
    font-style: italic;
    background: var(--brand-pale);
    padding: var(--spacing-md);
    border-left: 4px solid var(--brand-primary);
    border-radius: 4px;
    margin-bottom: var(--spacing-lg);
}

.lesson__subheading {
    font-size: 1.4rem;
    color: var(--brand-primary);
    margin: var(--spacing-lg) 0 var(--spacing-md) 0;
    padding-bottom: var(--spacing-xs);
    border-bottom: 2px solid var(--brand-lighter);
}

.lesson__command-block {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.lesson__command-block h4 {
    color: var(--brand-dark);
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
}

.lesson__command-block ul {
    background: var(--color-white);
    border-left: 3px solid var(--brand-light);
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) var(--spacing-xl);
    border-radius: 4px;
}

.lesson__code {
    background: var(--color-text);
    color: #e8f5ee;
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    overflow-x: auto;
    margin: var(--spacing-md) 0;
    border-left: 4px solid var(--brand-primary);
}

.lesson__code code {
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
}

.lesson__callout {
    background: var(--brand-lighter);
    border: 2px solid var(--brand-primary);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin: var(--spacing-md) 0;
    font-weight: 500;
    color: var(--brand-dark);
}

.lesson__table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-md) 0;
    background: var(--color-white);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 2px 4px var(--color-shadow);
}

.lesson__table thead {
    background: var(--brand-primary);
    color: var(--color-white);
}

.lesson__table th {
    padding: var(--spacing-sm) var(--spacing-md);
    text-align: left;
    font-weight: 600;
}

.lesson__table td {
    padding: var(--spacing-sm) var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

.lesson__table tbody tr:hover {
    background: var(--brand-pale);
}

.lesson__takeaway {
    background: linear-gradient(135deg, var(--brand-lighter) 0%, var(--brand-pale) 100%);
    border: 3px solid var(--brand-primary);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.lesson__takeaway h3 {
    color: var(--brand-primary);
    font-size: 1.3rem;
    margin-bottom: var(--spacing-md);
}

.lesson__takeaway p {
    color: var(--color-text);
    font-size: 1.05rem;
    margin-bottom: 0;
}

/* ============================================
   Final Word Section
   ============================================ */

.why_sosheets__final {
    background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-dark) 100%);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 16px var(--color-shadow-hover);
    padding: var(--spacing-xl);
    color: var(--color-white);
    text-align: center;
    opacity: 0;
    animation: fadeInUp 0.6s ease-out 0.2s forwards;
}

.why_sosheets__final-title {
    color: var(--color-white);
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
}

.why_sosheets__final p {
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.why_sosheets__final p:last-child {
    margin-bottom: 0;
}

/* ============================================
   Animations
   ============================================ */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   Beta Modal Styles (from homepage)
   ============================================ */

.modal {
    display: none;
    position: fixed;
    z-index: 10000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    align-items: center;
    justify-content: center;
}

.modal-content {
    background-color: var(--color-white);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    max-width: 500px;
    width: 90%;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    position: relative;
}

.modal-close {
    position: absolute;
    right: var(--spacing-md);
    top: var(--spacing-md);
    font-size: 28px;
    font-weight: bold;
    color: var(--color-text-light);
    cursor: pointer;
    transition: color var(--transition-speed);
}

.modal-close:hover {
    color: var(--color-text);
}

.modal-content h2 {
    color: var(--brand-primary);
    margin-top: 0;
    margin-bottom: var(--spacing-md);
}

.modal-content p {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
}

.modal-content form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.modal-content input[type="email"] {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: border-color var(--transition-speed);
}

.modal-content input[type="email"]:focus {
    outline: none;
    border-color: var(--brand-primary);
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 1024px) {
    .why_sosheets {
        flex-direction: column;
        padding: var(--spacing-md);
    }
    
    .why_sosheets__sidebar {
        position: relative;
        width: 100%;
        max-height: none;
        top: 0;
    }
    
    .why_sosheets__content {
        max-width: 100%;
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-lg: 1.5rem;
        --spacing-xl: 2rem;
    }
    
    .why_sosheets {
        padding: var(--spacing-sm);
    }
    
    .why_sosheets__main-title {
        font-size: 1.75rem;
    }
    
    .why_sosheets__intro,
    .lessons_overview,
    .lesson__content,
    .why_sosheets__final {
        padding: var(--spacing-md);
    }
    
    .lesson__title {
        font-size: 1.2rem;
    }
    
    .lessons_overview__grid {
        grid-template-columns: 1fr;
    }
    
    .lesson__table {
        font-size: 0.9rem;
    }
    
    .lesson__code {
        font-size: 0.8rem;
    }
}

/* ============================================
   Print Styles
   ============================================ */

@media print {
    .why_sosheets__sidebar {
        display: none;
    }
    
    .lesson__toggle {
        display: none;
    }
    
    .lesson__card.collapsed .lesson__content {
        max-height: none;
        padding: var(--spacing-md);
    }
    
    .why_sosheets {
        padding: 0;
    }
}

/* ============================================
   Accessibility
   ============================================ */

.why_sosheets *:focus {
    outline: 3px solid var(--brand-primary);
    outline-offset: 2px;
}

.why_sosheets__nav-link:focus,
.lesson__toggle:focus {
    outline: 3px solid var(--brand-primary);
}

/* Reduced motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}