/* ===============================
   SAMAJIK UNIT DROPDOWN STYLES
   =============================== */

   .unit-list {
    margin: var(--spacing-xl) 0;
    padding: 0;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s var(--ease-standard) forwards;
    animation-delay: 0.2s;
}

/* Remove list-style dots from unit list and items */
.unit-list > ul,
.unit-list > ul > li {
    list-style: none;
    margin: 0;
    padding: 0;
}

/* Unified style for dropdown button and lesson links */
.unit-toggle,
.lesson-link {
    display: block;
    width: 100%;
    text-align: left;
    background: var(--background-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 1.08em;
    font-family: inherit;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    cursor: pointer;
    transition: all 0.3s var(--ease-standard);
    position: relative;
    outline: none;
    box-shadow: none;
    text-decoration: none;
}

.unit-toggle i {
    float: right;
    margin-left: var(--spacing-md);
    font-size: 1em;
    transition: transform 0.3s var(--ease-standard);
}

.unit-toggle.open i {
    transform: rotate(180deg);
}

/* Unified hover/focus for dropdown button and lesson links */
.unit-toggle:hover, .unit-toggle:focus,
.lesson-link:hover, .lesson-link:focus {
    background-color: var(--secondary-color);
    color: var(--primary-color);
    border-color: var(--primary-color);
    box-shadow: 0 2px 8px var(--shadow-color);
    transform: translateX(5px);
    outline: none;
}

.unit-toggle:active, .lesson-link:active {
    background-color: var(--secondary-color);
    color: var(--primary-color);
    border-color: var(--primary-color);
    transform: translateX(2px);
}

.unit-toggle:focus-visible, .lesson-link:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Lesson List Container */
.lesson-list {
    padding: 0;
    background: none;
    border: none;
    animation: none;
    display: none;
}

.lesson-list.open {
    display: block;
}

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

.lesson-list ul li {
    list-style: none;
}

.lesson-list li {
    margin-bottom: var(--spacing-xs);
    opacity: 0;
    transform: translateX(-20px);
    animation: slideInRight 0.3s var(--ease-standard) forwards;
}

.lesson-list li:nth-child(1) { animation-delay: 0.1s; }
.lesson-list li:nth-child(2) { animation-delay: 0.15s; }
.lesson-list li:nth-child(3) { animation-delay: 0.2s; }
.lesson-list li:nth-child(4) { animation-delay: 0.25s; }
.lesson-list li:nth-child(5) { animation-delay: 0.3s; }
.lesson-list li:nth-child(n+6) { animation-delay: 0.35s; }

.lesson-list li:last-child {
    margin-bottom: 0;
}

/* Lesson Links */
.lesson-link {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--background-color);
    border-radius: var(--radius-sm);
    color: var(--text-color);
    text-decoration: none;
    border: 1px solid var(--border-color);
    transition: all 0.3s var(--ease-smooth);
    position: relative;
    overflow: hidden;
    font-weight: 500;
}

.lesson-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(225, 40, 48, 0.1), transparent);
    transition: left 0.4s var(--ease-standard);
}

.lesson-link:hover::before {
    left: 100%;
}

/* Remove any extra hover/active styles from .lesson-link */
.lesson-link::before,
.lesson-link.active-lesson,
.lesson-link.active-lesson:hover {
    background: none !important;
    color: inherit !important;
    border-color: inherit !important;
    box-shadow: none !important;
    transform: none !important;
}

.lesson-link.active-lesson {
    background: linear-gradient(135deg, var(--primary-color), var(--hover-color));
    color: white;
    border-color: var(--primary-color);
    font-weight: 600;
    box-shadow: 0 3px 12px var(--shadow-color);
}

.lesson-link.active-lesson:hover {
    background: linear-gradient(135deg, var(--hover-color), var(--primary-color));
    transform: translateX(5px);
}

/* Loading State */
.unit-dropdown.loading .unit-toggle {
    pointer-events: none;
    opacity: 0.7;
}

.unit-dropdown.loading .unit-toggle::after {
    content: '';
    position: absolute;
    right: 40px;
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    border: 2px solid var(--primary-color);
    border-top: 2px solid transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* Custom Animations */
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
        max-height: 0;
    }
    to {
        opacity: 1;
        transform: translateY(0);
        max-height: 500px;
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes spin {
    0% { transform: translateY(-50%) rotate(0deg); }
    100% { transform: translateY(-50%) rotate(360deg); }
}

/* ===============================
   DARK MODE OVERRIDES
   =============================== */

.dark-mode .unit-dropdown {
    background: var(--card-background);
    border-color: var(--border-color);
    box-shadow: 0 2px 8px var(--shadow-color);
}

.dark-mode .unit-dropdown:hover {
    box-shadow: 0 4px 16px var(--shadow-color);
    border-color: var(--primary-color);
}

.dark-mode .unit-toggle {
    color: var(--primary-color);
}

.dark-mode .unit-toggle:hover,
.dark-mode .unit-toggle:focus {
    background: var(--secondary-color);
    color: var(--hover-color);
}

.dark-mode .unit-toggle.open {
    background: linear-gradient(135deg, var(--primary-color), var(--hover-color));
    color: white;
}

.dark-mode .lesson-list {
    background: var(--card-background);
    border-top-color: var(--border-color);
}

.dark-mode .lesson-link {
    background-color: var(--background-color);
    color: var(--text-color);
    border-color: var(--border-color);
}

.dark-mode .lesson-link:hover,
.dark-mode .lesson-link:focus {
    background-color: var(--secondary-color);
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.dark-mode .lesson-link.active-lesson {
    background: linear-gradient(135deg, var(--primary-color), var(--hover-color));
    color: white;
    border-color: var(--primary-color);
}

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

/* Tablet Styles */
@media (max-width: 768px) {
    .unit-list {
        margin: var(--spacing-lg) 0;
    }
    
    .unit-dropdown {
        margin-bottom: var(--spacing-md);
        border-radius: var(--radius-md);
    }
    
    .unit-toggle {
        font-size: 1.1em;
        padding: var(--spacing-md) var(--spacing-lg);
    }
    
    .lesson-list ul {
        padding: var(--spacing-md) var(--spacing-lg);
    }
    
    .lesson-link {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.95em;
    }
    
    .lesson-link:hover,
    .lesson-link:focus {
        transform: translateX(6px);
    }
}

/* Mobile Styles */
@media (max-width: 600px) {
    .unit-list {
        margin: var(--spacing-md) 0;
    }
    
    .unit-dropdown {
        margin-bottom: var(--spacing-sm);
        border-radius: var(--radius-sm);
    }
    
    .unit-toggle {
        font-size: 1em;
        padding: var(--spacing-md);
        font-weight: 600;
    }
    
    .unit-toggle i {
        margin-left: var(--spacing-sm);
        font-size: 0.9em;
    }
    
    .lesson-list ul {
        padding: var(--spacing-md);
    }
    
    .lesson-list li {
        margin-bottom: var(--spacing-xs);
    }
    
    .lesson-link {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.9em;
        border-radius: var(--radius-xs);
    }
    
    .lesson-link:hover,
    .lesson-link:focus {
        transform: translateX(4px);
    }
}

/* Small Mobile Styles */
@media (max-width: 480px) {
    .unit-dropdown {
        box-shadow: 0 1px 4px var(--shadow-color);
    }
    
    .unit-dropdown:hover {
        box-shadow: 0 2px 8px var(--shadow-color);
        transform: translateY(-1px);
    }
    
    .unit-toggle {
        font-size: 0.95em;
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .lesson-list ul {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .lesson-link {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.85em;
    }
    
    .lesson-link:hover,
    .lesson-link:focus {
        transform: translateX(3px);
        box-shadow: 0 2px 8px var(--shadow-color);
    }
}

/* ===============================
   ACCESSIBILITY ENHANCEMENTS
   =============================== */

/* Focus indicators */
.unit-toggle:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
}

.lesson-link:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .unit-dropdown {
        border-width: 2px;
    }
    
    .unit-toggle {
        font-weight: 700;
    }
    
    .lesson-link {
        border-width: 2px;
        font-weight: 600;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .unit-dropdown,
    .unit-toggle,
    .lesson-list,
    .lesson-link {
        transition: none;
        animation: none;
    }
    
    .unit-toggle i {
        transition: none;
    }
    
    .lesson-list li {
        animation: none;
        opacity: 1;
        transform: none;
    }
    
    .unit-list {
        animation: none;
        opacity: 1;
        transform: none;
    }
}

/* Print styles */
@media print {
    .unit-dropdown {
        box-shadow: none;
        border: 1px solid #000;
    }
    
    .unit-toggle {
        background: none !important;
        color: #000 !important;
    }
    
    .lesson-list {
        display: block !important;
        opacity: 1 !important;
        transform: none !important;
    }
    
    .lesson-link {
        background: none !important;
        color: #000 !important;
        border: 1px solid #000;
    }
}