/* ========================================
   Application Header
   ======================================== */

.app-header {
    background-color: var(--surface);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-xl);
    max-width: 100%;
}

.app-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.app-icon {
    flex-shrink: 0;
}

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

/* ========================================
   Theme Toggle Button
   ======================================== */

.theme-toggle {
    background: none;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    cursor: pointer;
    padding: var(--spacing-sm);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: background-color 0.2s, border-color 0.2s, color 0.2s;
}

.theme-toggle:hover {
    background-color: var(--surface-hover);
    border-color: var(--border-hover);
    color: var(--text-primary);
}

.theme-toggle:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
    transition: transform 0.3s ease;
}

.theme-toggle:hover svg {
    transform: rotate(15deg);
}

.theme-toggle .sun-icon {
    display: none;
}

.theme-toggle .moon-icon {
    display: block;
}

[data-theme='dark'] .theme-toggle .sun-icon {
    display: block;
}

[data-theme='dark'] .theme-toggle .moon-icon {
    display: none;
}

/* ========================================
   Mobile Menu Toggle
   ======================================== */

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
    width: 40px;
    height: 40px;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    border-radius: var(--radius-sm);
    transition: background-color 0.2s;
}

.mobile-menu-toggle:hover {
    background-color: var(--background-alt);
}

.mobile-menu-toggle:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.hamburger-line {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: transform 0.3s, opacity 0.3s;
}

.mobile-menu-toggle.active .hamburger-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

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

.mobile-menu-toggle.active .hamburger-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ========================================
   Main Layout
   ======================================== */

.main-layout {
    display: flex;
    flex: 1;
    overflow: hidden;
}

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

.sidebar {
    width: 280px;
    background-color: var(--background-alt);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar-content {
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

/* ========================================
   Search Container
   ======================================== */

.search-container {
    position: relative;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border);
}

.search-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 14px;
    background-color: var(--surface);
    color: var(--text-primary);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.search-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.search-input::placeholder {
    color: var(--text-tertiary);
}

.search-results {
    margin-top: var(--spacing-sm);
    font-size: 12px;
    color: var(--text-secondary);
}

.search-results-count {
    margin-top: var(--spacing-sm);
    font-size: 12px;
    color: var(--text-secondary);
    font-style: italic;
}

.search-results-dropdown {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    max-height: 320px;
    overflow-y: auto;
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 100;
    margin-top: var(--spacing-xs);
}

.search-results-dropdown.visible {
    display: block;
}

.search-result-item {
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    border-bottom: 1px solid var(--border);
    transition: background-color 0.15s;
}

.search-result-item:last-child {
    border-bottom: none;
}

.search-result-item:hover,
.search-result-item.selected {
    background-color: var(--hover);
}

.search-result-item.selected {
    background-color: rgba(37, 99, 235, 0.1);
}

.search-result-name {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.search-result-meta {
    font-size: 12px;
    color: var(--text-secondary);
    display: flex;
    gap: var(--spacing-sm);
}

.search-result-type {
    text-transform: capitalize;
    background-color: var(--hover);
    padding: 1px 6px;
    border-radius: var(--radius-sm);
}

.search-result-parent {
    color: var(--text-tertiary);
}

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

.navigation {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
}

.nav-section {
    margin-bottom: var(--spacing-md);
}

.nav-section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    border-radius: var(--radius-md);
    font-weight: 600;
    color: var(--text-primary);
    transition: background-color 0.2s;
}

.nav-section-header:hover {
    background-color: var(--surface-hover);
}

.nav-section-icon {
    transition: transform 0.2s;
}

.nav-section-icon.expanded {
    transform: rotate(90deg);
}

.nav-items {
    margin-top: var(--spacing-xs);
    padding-left: var(--spacing-md);
}

.nav-item {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s;
}

.nav-item:hover {
    background-color: var(--surface-hover);
    color: var(--text-primary);
    text-decoration: none;
}

.nav-item.active {
    background-color: var(--primary);
    color: white;
    font-weight: 500;
}

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

.main-content {
    flex: 1;
    overflow-y: auto;
    background-color: var(--background);
}

/* ========================================
   Welcome Screen
   ======================================== */

.welcome-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100%;
    padding: var(--spacing-2xl);
}

.drop-zone {
    text-align: center;
    padding: var(--spacing-2xl);
    border: 2px dashed var(--border);
    border-radius: var(--radius-lg);
    background-color: var(--background-alt);
    transition: border-color 0.3s, background-color 0.3s;
    cursor: pointer;
    max-width: 500px;
}

.drop-zone:hover {
    border-color: var(--border-hover);
    background-color: var(--surface-hover);
}

.drop-zone--active {
    border-color: var(--primary);
    background-color: rgba(37, 99, 235, 0.05);
}

.file-icon {
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-lg);
}

.drop-zone h2 {
    font-size: 20px;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.drop-zone p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.file-info {
    font-size: 12px;
    color: var(--text-tertiary);
}

.privacy-disclaimer {
    margin-top: var(--spacing-lg);
    font-size: 12px;
    color: var(--text-tertiary);
    text-align: center;
    max-width: 500px;
}

/* ========================================
   Buttons
   ======================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s, color 0.2s, transform 0.1s;
    text-decoration: none;
    user-select: none;
}

.btn:active {
    transform: translateY(1px);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn:disabled:active {
    transform: none;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--surface-hover);
    border-color: var(--border-hover);
}

/* ========================================
   Loading Overlay
   ======================================== */

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.loading-content {
    background-color: var(--surface);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spinner-rotation 0.8s linear infinite;
    margin: 0 auto var(--spacing-md);
}

@keyframes spinner-rotation {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

.loading-text {
    color: var(--text-primary);
    font-size: 16px;
    font-weight: 500;
    margin: 0;
}

/* ========================================
   Error Container
   ======================================== */

.error-container {
    position: fixed;
    top: var(--spacing-xl);
    right: var(--spacing-xl);
    max-width: 400px;
    z-index: 1001;
    display: flex;
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.error-content {
    background-color: var(--error);
    color: white;
    padding: var(--spacing-lg);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.error-icon {
    font-size: 24px;
    font-weight: bold;
}

.error-message {
    margin: 0;
    font-size: 14px;
    line-height: 1.5;
}

.error-content .btn {
    align-self: flex-start;
    background-color: rgba(255, 255, 255, 0.2);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.error-content .btn:hover {
    background-color: rgba(255, 255, 255, 0.3);
}

/* ========================================
   Credits Section
   ======================================== */

.credits-section {
    position: fixed;
    bottom: var(--spacing-md);
    left: var(--spacing-md);
    z-index: 50;
    max-width: 400px;
}

.credits-section p {
    font-size: 11px;
    color: var(--text-tertiary);
    margin: 0;
    line-height: 1.4;
}

.credits-section a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

.credits-section a:hover {
    color: var(--primary);
    text-decoration: underline;
}

.credits-section .disclaimer {
    font-size: 10px;
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
}

/* ========================================
   Sidebar Credits (shown when viewing data)
   ======================================== */

.sidebar-credits {
    padding: var(--spacing-md);
    border-top: 1px solid var(--border);
    margin-top: auto;
    flex-shrink: 0;
}

.sidebar-credits p {
    font-size: 10px;
    color: var(--text-tertiary);
    margin: 0;
    line-height: 1.4;
}

.sidebar-credits a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

.sidebar-credits a:hover {
    color: var(--primary);
    text-decoration: underline;
}

.sidebar-credits .disclaimer {
    font-size: 9px;
    color: var(--text-tertiary);
    margin-top: var(--spacing-xs);
}

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

/* Desktop (1200px and above) - Default styles optimized for desktop */
@media (min-width: 1200px) {
    .sidebar {
        width: 280px;
    }

    .main-content {
        flex: 1;
    }

    .header-content {
        padding: var(--spacing-md) var(--spacing-xl);
    }

    .documentation-content {
        padding: var(--spacing-2xl);
        max-width: 1200px;
    }
}

/* Tablet (768px to 1199px) */
@media (max-width: 1199px) and (min-width: 768px) {
    .sidebar {
        width: 240px;
    }

    .header-content {
        padding: var(--spacing-md);
    }

    .header-actions {
        gap: var(--spacing-sm);
    }

    .btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 13px;
        /* Enhanced touch target size for tablets */
        min-height: 44px;
    }

    /* Enhanced touch interactions for tablet */
    .nav-item {
        min-height: 44px;
        display: flex;
        align-items: center;
    }

    .search-input {
        min-height: 44px;
        font-size: 16px; /* Prevents zoom on iOS */
    }

    /* Better spacing for touch on tablets */
    .nav-section-header {
        min-height: 44px;
        display: flex;
        align-items: center;
    }

    .card-header {
        min-height: 48px;
        display: flex;
        align-items: center;
    }

    /* Ensure drop zone is touch-friendly */
    .drop-zone {
        padding: var(--spacing-xl);
        min-height: 200px;
    }

    /* Adjust table for better tablet viewing */
    .schema-table th,
    .schema-table td {
        padding: var(--spacing-md) var(--spacing-sm);
    }
}

@media (max-width: 767px) {
    .main-layout {
        flex-direction: column;
    }

    /* Show mobile menu toggle button */
    .mobile-menu-toggle {
        display: flex;
    }

    /* Sidebar becomes overlay on mobile */
    .sidebar {
        position: fixed;
        top: 0;
        left: -100%;
        width: 80%;
        max-width: 280px;
        height: 100vh;
        z-index: 200;
        border-right: 1px solid var(--border);
        border-bottom: none;
        box-shadow: var(--shadow-lg);
        transition: left 0.3s ease-in-out;
    }

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

    /* Mobile overlay backdrop */
    .sidebar-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0, 0, 0, 0.5);
        z-index: 150;
        opacity: 0;
        transition: opacity 0.3s ease-in-out;
    }

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

    .header-content {
        gap: var(--spacing-md);
        padding: var(--spacing-md);
    }

    .app-title {
        font-size: 16px;
        flex: 1;
    }

    .header-actions {
        gap: var(--spacing-sm);
        flex-wrap: wrap;
    }

    .btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 13px;
        min-height: 44px;
    }

    .btn span {
        font-size: 13px;
    }

    .drop-zone {
        padding: var(--spacing-lg);
        min-height: 250px;
    }

    .welcome-screen {
        padding: var(--spacing-md);
    }

    .error-container {
        right: var(--spacing-md);
        left: var(--spacing-md);
        max-width: none;
    }

    /* Adjust footer for mobile - smaller and positioned at bottom-left */
    .credits-section {
        max-width: calc(100% - var(--spacing-md) * 2);
        font-size: 9px;
    }

    .credits-section p {
        font-size: 9px;
    }

    .credits-section .disclaimer {
        font-size: 8px;
    }
}