/**
 * Main CSS - Core styles and layout
 * Markdown Editor
 */

/* CSS Custom Properties */
:root {
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Source Code Pro', Consolas, monospace;
    --font-size-base: 14px;
    --font-size-sm: 12px;
    --font-size-lg: 16px;
    --font-size-xl: 18px;
    --line-height: 1.6;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;

    /* Borders */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.15);

    /* Z-index layers */
    --z-base: 1;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-modal: 1000;
    --z-toast: 2000;
}

/* Reset and Base Styles */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: var(--font-size-base);
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    line-height: var(--line-height);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
    width: 100vw;
}

/* Focus Styles */
:focus {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

:focus:not(:focus-visible) {
    outline: none;
}

:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* Skip Link for Accessibility */
.skip-link {
    position: absolute;
    top: -100%;
    left: 0;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--accent-primary);
    color: white;
    text-decoration: none;
    z-index: var(--z-toast);
    border-radius: 0 0 var(--border-radius-sm) 0;
}

.skip-link:focus {
    top: 0;
}

/* Application Container */
.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 100vw;
    overflow: hidden;
}

/* Main Content Layout */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
    position: relative;
}

/* Scrollbar Styles */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 5px;
    border: 2px solid var(--bg-secondary);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-thumb-hover);
}

/* Selection */
::selection {
    background: var(--selection-bg);
    color: var(--selection-text);
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Button Base Styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: inherit;
    font-size: var(--font-size-base);
    font-weight: 500;
    line-height: 1;
    color: var(--text-primary);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn:hover {
    background: var(--bg-hover);
    border-color: var(--border-hover);
}

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

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

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

.btn-primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
}

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

.btn-danger:hover {
    background: var(--danger-hover);
    border-color: var(--danger-hover);
}

/* Form Elements */
input[type="text"],
input[type="url"],
input[type="password"],
input[type="number"],
select,
textarea {
    font-family: inherit;
    font-size: var(--font-size-base);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    transition: border-color var(--transition-fast);
}

input[type="text"]:focus,
input[type="url"]:focus,
input[type="password"]:focus,
input[type="number"]:focus,
select:focus,
textarea:focus {
    border-color: var(--accent-primary);
    outline: none;
    box-shadow: 0 0 0 3px var(--accent-primary-transparent);
}

input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--accent-primary);
    cursor: pointer;
}

select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23888' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    padding-right: 32px;
}

/* Form Groups */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    color: var(--text-secondary);
}

.form-group input,
.form-group select {
    width: 100%;
}

/* Loading Spinner */
.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.3s ease;
    max-width: 400px;
}

.toast.success {
    border-left: 4px solid var(--success);
}

.toast.error {
    border-left: 4px solid var(--danger);
}

.toast.warning {
    border-left: 4px solid var(--warning);
}

.toast.info {
    border-left: 4px solid var(--accent-primary);
}

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

    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOut {
    from {
        transform: translateX(0);
        opacity: 1;
    }

    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

.toast.hiding {
    animation: slideOut 0.3s ease forwards;
}

/* Keyboard Shortcuts (kbd) */
kbd {
    display: inline-block;
    padding: 2px 6px;
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    box-shadow: inset 0 -1px 0 var(--border-color);
}

/* Zen Mode */
body.zen-mode .toolbar,
body.zen-mode .formatting-toolbar,
body.zen-mode .sidebar,
body.zen-mode .minimap,
body.zen-mode .editor-status-bar,
body.zen-mode #tabs-container,
body.zen-mode #new-tab-btn,
body.zen-mode .toolbar-left,
body.zen-mode .toolbar-right>*:not(#zen-mode-btn) {
    display: none !important;
}

body.zen-mode .app-container {
    padding: 0;
}

body.zen-mode .main-content {
    padding: var(--spacing-xl);
}

body.zen-mode .editor-pane,
body.zen-mode .preview-pane {
    max-width: 800px;
    margin: 0 auto;
}

body.zen-mode .resize-handle {
    display: none;
}

/* Responsive */
@media (max-width: 768px) {
    .main-content {
        flex-direction: column;
    }

    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        height: 100%;
        transform: translateX(-100%);
        z-index: var(--z-modal);
        transition: transform var(--transition-normal);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .minimap {
        display: none;
    }

    .resize-handle {
        display: none;
    }

    .editor-pane,
    .preview-pane {
        width: 100% !important;
    }

    body[data-view="split"] .editor-pane,
    body[data-view="split"] .preview-pane {
        display: none;
    }

    body[data-view="split"] .editor-pane {
        display: block;
    }

    .formatting-toolbar {
        overflow-x: auto;
        flex-wrap: nowrap;
    }

    .toolbar-center {
        flex: 1;
        min-width: 0;
    }

    .tabs-container {
        max-width: 150px;
    }
}

@media (max-width: 480px) {
    .formatting-toolbar {
        padding: var(--spacing-xs);
    }

    .format-group {
        gap: 2px;
    }

    .format-btn {
        padding: 6px;
    }

    .btn-group {
        display: none;
    }
}

/* Utility classes for previously inline styles */
.app-subtitle {
    font-size: 0.65rem;
    opacity: 0.7;
    margin-left: 8px;
}

.site-footer {
    background: var(--bg-secondary, #1a1a2e);
    padding: 2rem 1rem;
    text-align: center;
    border-top: 1px solid var(--border-color, #333);
}

.site-footer > p:first-of-type {
    margin: 0.5rem 0;
    font-size: 0.9rem;
    font-weight: 500;
}

.site-footer > p:nth-of-type(2) {
    margin: 0.5rem 0;
    font-size: 0.85rem;
}

.site-footer a {
    color: var(--accent-color, #7b68ee);
    text-decoration: none;
}

.site-footer nav {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    margin: 1rem 0;
    flex-wrap: wrap;
}

.site-footer nav a {
    color: inherit;
    opacity: 0.8;
    text-decoration: none;
    transition: opacity 0.2s;
}

.site-footer nav a:hover {
    opacity: 1;
}

.site-footer > p:last-of-type {
    margin: 0.5rem 0;
    font-size: 0.75rem;
    opacity: 0.5;
}

.moon-icon {
    display: none;
}

.math-button-icon {
    font-family: serif;
    font-style: italic;
}

/* Print Styles handled in print.css */