/**
 * Hamburger Menu Styles
 * TOEIC Vocabulary List - UI v1
 */

/* ==================== Header Top Bar ==================== */

.header-top {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

/* ==================== Hamburger Button ==================== */

.hamburger-btn {
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    width: 30px;
    height: 30px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 10;
    transition: all var(--transition-fast);
}

.hamburger-btn:hover {
    opacity: 0.8;
}

.hamburger-line {
    width: 100%;
    height: 3px;
    background-color: var(--color-text-inverse);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.hamburger-btn.active .hamburger-line:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
}

.hamburger-btn.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.hamburger-btn.active .hamburger-line:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
}

/* ==================== Sidebar Menu ==================== */

.sidebar-menu {
    position: fixed;
    top: 0;
    left: -300px;
    width: 300px;
    height: 100vh;
    background-color: var(--color-bg-card);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    transition: left var(--transition-base);
    overflow-y: auto;
}

.sidebar-menu.open {
    left: 0;
}

/* ==================== Sidebar Header ==================== */

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
    background-color: var(--color-bg-header);
}

.sidebar-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-inverse);
    margin: 0;
}

.sidebar-close-btn {
    background: transparent;
    border: none;
    font-size: var(--font-size-2xl);
    color: var(--color-text-inverse);
    cursor: pointer;
    padding: var(--spacing-xs);
    line-height: 1;
    transition: all var(--transition-fast);
}

.sidebar-close-btn:hover {
    opacity: 0.7;
    transform: scale(1.1);
}

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

.sidebar-nav {
    padding: var(--spacing-lg);
}

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

.sidebar-section:last-child {
    margin-bottom: 0;
}

.sidebar-section-title {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-md);
}

.sidebar-item {
    padding: var(--spacing-sm) 0;
}

/* ==================== Theme Selector ==================== */

.theme-selector {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    width: 100%;
}

.theme-option-btn {
    width: 100%;
    padding: var(--spacing-md);
    background-color: var(--color-bg-card);
    color: var(--color-text-primary);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: left;
}

.theme-option-btn:hover {
    border-color: var(--color-primary);
    background-color: var(--color-primary-light);
    color: var(--color-primary);
}

.theme-option-btn.active {
    background-color: var(--color-primary);
    border-color: var(--color-primary-dark);
    color: white;
    font-weight: var(--font-weight-bold);
}

/* ==================== Sidebar Overlay ==================== */

.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
}

.sidebar-overlay.show {
    opacity: 1;
    visibility: visible;
}

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

@media (max-width: 768px) {
    .sidebar-menu {
        width: 280px;
        left: -280px;
    }
}

/* ==================== Prevent Body Scroll When Sidebar Open ==================== */

body.sidebar-open {
    overflow: hidden;
}