/*
 * MD-PDF - Modern Markdown Editor & PDF Converter
 * Design System & Styles
 */

/* ===== CSS Variables / Design Tokens ===== */
:root {
    /* Colors - Dark Theme (Default) */
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --bg-elevated: #30363d;

    --text-primary: #f0f6fc;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;

    --accent-primary: #58a6ff;
    --accent-secondary: #388bfd;
    --accent-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --accent-glow: rgba(88, 166, 255, 0.4);

    --border-color: rgba(255, 255, 255, 0.1);
    --border-hover: rgba(255, 255, 255, 0.2);

    --success: #3fb950;
    --warning: #d29922;
    --error: #f85149;

    /* Glassmorphism */
    --glass-bg: rgba(22, 27, 34, 0.8);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-blur: 20px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px var(--accent-glow);

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.4s ease;

    /* Layout */
    --toolbar-height: 56px;
    --statusbar-height: 28px;
}

/* Light Theme */
[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f6f8fa;
    --bg-tertiary: #eaeef2;
    --bg-elevated: #ffffff;

    --text-primary: #1f2328;
    --text-secondary: #57606a;
    --text-muted: #8b949e;

    --accent-primary: #0969da;
    --accent-secondary: #0550ae;
    --accent-glow: rgba(9, 105, 218, 0.3);

    --border-color: rgba(0, 0, 0, 0.1);
    --border-hover: rgba(0, 0, 0, 0.2);

    --glass-bg: rgba(255, 255, 255, 0.8);
    --glass-border: rgba(0, 0, 0, 0.1);

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.15);
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow: hidden;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* ===== App Container ===== */
.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 100vw;
    background: var(--bg-primary);
    position: relative;
}

/* Animated Background Gradient */
.app-container::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse at 20% 0%, rgba(88, 166, 255, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 100%, rgba(118, 75, 162, 0.08) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

/* ===== Toolbar ===== */
.toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--toolbar-height);
    padding: 0 var(--spacing-md);
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-bottom: 1px solid var(--glass-border);
    position: relative;
    z-index: 100;
}

.toolbar-left,
.toolbar-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding-right: var(--spacing-md);
    margin-right: var(--spacing-sm);
    border-right: 1px solid var(--border-color);
}

.logo-icon {
    width: 32px;
    height: 32px;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

.logo-text {
    font-weight: 700;
    font-size: 1.1rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Format Buttons */
.format-buttons {
    display: flex;
    align-items: center;
    gap: 2px;
}

.format-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.format-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    transform: translateY(-1px);
}

.format-btn:active {
    transform: translateY(0);
}

.format-btn .text-btn {
    font-size: 0.7rem;
    font-weight: 700;
    font-family: var(--font-sans);
}

.divider {
    width: 1px;
    height: 20px;
    background: var(--border-color);
    margin: 0 var(--spacing-xs);
}

/* Action Buttons */
.action-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.action-btn:hover {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border-color: var(--border-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.action-btn.primary {
    background: var(--accent-gradient);
    border: none;
    color: white;
    box-shadow: var(--shadow-glow);
}

.action-btn.primary:hover {
    filter: brightness(1.1);
    box-shadow: var(--shadow-glow), var(--shadow-md);
}

/* Theme Toggle */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.theme-toggle:hover {
    background: var(--bg-elevated);
    border-color: var(--accent-primary);
    transform: rotate(15deg);
}

.theme-toggle svg {
    position: absolute;
    transition: all var(--transition-normal);
    color: var(--text-secondary);
}

.sun-icon {
    opacity: 0;
    transform: rotate(-90deg) scale(0);
}

.moon-icon {
    opacity: 1;
    transform: rotate(0) scale(1);
}

[data-theme="light"] .sun-icon {
    opacity: 1;
    transform: rotate(0) scale(1);
}

[data-theme="light"] .moon-icon {
    opacity: 0;
    transform: rotate(90deg) scale(0);
}

/* ===== Editor Container ===== */
.editor-container {
    display: flex;
    flex: 1;
    overflow: hidden;
    position: relative;
    z-index: 1;
}

/* Panels */
.panel {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-width: 300px;
    background: var(--bg-secondary);
    overflow: hidden;
}

.editor-panel {
    border-right: 1px solid var(--border-color);
}

.panel-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.panel-icon {
    font-size: 0.9rem;
}

.panel-title {
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.char-count {
    margin-left: auto;
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

/* Editor Textarea */
.editor-textarea {
    flex: 1;
    width: 100%;
    padding: var(--spacing-lg);
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.95rem;
    line-height: 1.7;
    resize: none;
    outline: none;
    overflow-y: auto;
}

.editor-textarea::placeholder {
    color: var(--text-muted);
    font-style: italic;
}

/* Custom Scrollbar */
.editor-textarea::-webkit-scrollbar,
.preview-content::-webkit-scrollbar {
    width: 8px;
}

.editor-textarea::-webkit-scrollbar-track,
.preview-content::-webkit-scrollbar-track {
    background: transparent;
}

.editor-textarea::-webkit-scrollbar-thumb,
.preview-content::-webkit-scrollbar-thumb {
    background: var(--bg-elevated);
    border-radius: var(--radius-full);
    border: 2px solid var(--bg-secondary);
}

.editor-textarea::-webkit-scrollbar-thumb:hover,
.preview-content::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Resize Handle */
.resize-handle {
    width: 6px;
    background: var(--bg-tertiary);
    cursor: col-resize;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition-fast);
    position: relative;
    z-index: 10;
}

.resize-handle:hover,
.resize-handle.active {
    background: var(--accent-primary);
}

.resize-grip {
    width: 2px;
    height: 40px;
    background: var(--text-muted);
    border-radius: var(--radius-full);
    opacity: 0.5;
}

.resize-handle:hover .resize-grip,
.resize-handle.active .resize-grip {
    background: white;
    opacity: 1;
}

/* Preview Panel */
.preview-panel {
    background: var(--bg-primary);
}

.copy-html-btn {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-left: auto;
    padding: 4px 8px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    font-size: 0.7rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.copy-html-btn:hover {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border-color: var(--accent-primary);
}

/* Preview Content */
.preview-content {
    flex: 1;
    padding: var(--spacing-lg);
    overflow-y: auto;
}

.placeholder-text {
    color: var(--text-muted);
    font-style: italic;
    text-align: center;
    padding-top: var(--spacing-xl);
}

/* ===== Markdown Styles ===== */
.markdown-body {
    color: var(--text-primary);
    font-size: 0.875rem;
    line-height: 1.5;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
    margin-top: 1em;
    margin-bottom: 0.4em;
    font-weight: 600;
    line-height: 1.25;
    color: var(--text-primary);
}

.markdown-body h1 {
    font-size: 1.75em;
    padding-bottom: 0.25em;
    border-bottom: 1px solid var(--border-color);
}

.markdown-body h2 {
    font-size: 1.4em;
    padding-bottom: 0.25em;
    border-bottom: 1px solid var(--border-color);
}

.markdown-body h3 {
    font-size: 1.15em;
}

.markdown-body h4 {
    font-size: 1em;
}

.markdown-body h5 {
    font-size: 0.875em;
}

.markdown-body h6 {
    font-size: 0.85em;
    color: var(--text-secondary);
}

.markdown-body p {
    margin-bottom: 0.75em;
}

.markdown-body a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.markdown-body a:hover {
    text-decoration: underline;
}

.markdown-body strong {
    font-weight: 600;
    color: var(--text-primary);
}

.markdown-body em {
    font-style: italic;
}

.markdown-body del {
    color: var(--text-muted);
}

.markdown-body code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    padding: 0.2em 0.4em;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    color: var(--accent-primary);
}

.markdown-body pre {
    margin: 0.75em 0;
    padding: var(--spacing-sm);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    overflow-x: auto;
    border: 1px solid var(--border-color);
}

.markdown-body pre code {
    padding: 0;
    background: transparent;
    color: var(--text-primary);
    font-size: 0.8em;
    line-height: 1.4;
}

.markdown-body blockquote {
    margin: 0.75em 0;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-left: 4px solid var(--accent-primary);
    background: var(--bg-tertiary);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    color: var(--text-secondary);
}

.markdown-body blockquote p:last-child {
    margin-bottom: 0;
}

.markdown-body ul,
.markdown-body ol {
    margin: 0.75em 0;
    padding-left: 1.5em;
}

.markdown-body li {
    margin-bottom: 0.2em;
}

.markdown-body li>ul,
.markdown-body li>ol {
    margin: 0.2em 0;
}

.markdown-body hr {
    margin: 1.5em 0;
    border: none;
    height: 1px;
    background: linear-gradient(to right, transparent, var(--border-color), transparent);
}

.markdown-body img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    margin: 0.75em 0;
}

.markdown-body table {
    width: 100%;
    margin: 0.75em 0;
    border-collapse: collapse;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.markdown-body th,
.markdown-body td {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--border-color);
    text-align: left;
}

.markdown-body th {
    background: var(--bg-tertiary);
    font-weight: 600;
}

.markdown-body tr:nth-child(even) {
    background: var(--bg-secondary);
}

.markdown-body input[type="checkbox"] {
    margin-right: var(--spacing-sm);
    accent-color: var(--accent-primary);
}

/* Task List / Checkbox Styles */
.markdown-body .task-list-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    list-style: none;
    margin-left: -1.5em;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-fast);
}

.markdown-body .task-list-item:hover {
    background: var(--bg-tertiary);
}

.markdown-body .task-list-item .task-icon {
    flex-shrink: 0;
    width: 16px;
    height: 16px;
    margin-top: 4px;
    color: var(--text-muted);
    transition: all var(--transition-fast);
}

.markdown-body .task-list-item .task-icon.unchecked {
    color: var(--text-muted);
}

.markdown-body .task-list-item .task-icon.checked {
    color: var(--success);
}

.markdown-body .task-list-item.checked .task-text {
    color: var(--text-muted);
    text-decoration: line-through;
    text-decoration-color: var(--text-muted);
}

.markdown-body .task-list-item .task-text {
    flex: 1;
}

/* ===== Status Bar ===== */
.status-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--statusbar-height);
    padding: 0 var(--spacing-md);
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
    font-size: 0.75rem;
    color: var(--text-muted);
    position: relative;
    z-index: 100;
}

.status-left,
.status-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.status-item {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* ===== Modal ===== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    width: 100%;
    max-width: 420px;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    transform: scale(0.9) translateY(20px);
    transition: transform var(--transition-normal);
    overflow: hidden;
}

.modal-overlay.active .modal {
    transform: scale(1) translateY(0);
}

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

.modal-header h3 {
    font-size: 1rem;
    font-weight: 600;
}

.modal-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--bg-elevated);
    color: var(--text-primary);
}

.modal-body {
    padding: var(--spacing-lg);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-family: var(--font-sans);
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.btn-secondary:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-primary {
    background: var(--accent-gradient);
    border: none;
    color: white;
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    filter: brightness(1.1);
    transform: translateY(-1px);
}

/* ===== Toast Notifications ===== */
.toast-container {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    z-index: 2000;
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    color: var(--text-primary);
    font-size: 0.9rem;
    animation: slideIn var(--transition-normal) ease;
}

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

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

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

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

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

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

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

.toast.removing {
    animation: slideOut var(--transition-normal) ease forwards;
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .toolbar {
        padding: 0 var(--spacing-sm);
        height: auto;
        min-height: var(--toolbar-height);
        flex-wrap: wrap;
        gap: var(--spacing-sm);
        padding: var(--spacing-sm);
    }

    .toolbar-left {
        order: 1;
        width: 100%;
        justify-content: space-between;
    }

    .toolbar-right {
        order: 2;
        width: 100%;
        justify-content: flex-end;
    }

    .format-buttons {
        display: none;
    }

    .logo {
        border: none;
        margin: 0;
        padding: 0;
    }

    .action-btn span {
        display: none;
    }

    .editor-container {
        flex-direction: column;
    }

    .panel {
        min-width: unset;
        flex: 1;
    }

    .editor-panel {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }

    .resize-handle {
        display: none;
    }

    .modal {
        margin: var(--spacing-md);
        max-width: calc(100% - var(--spacing-lg));
    }

    .toast-container {
        left: var(--spacing-md);
        right: var(--spacing-md);
        bottom: var(--spacing-md);
    }

    .toast {
        width: 100%;
    }
}

/* ===== Print Styles ===== */
@media print {

    .toolbar,
    .status-bar,
    .editor-panel,
    .resize-handle {
        display: none !important;
    }

    .preview-panel {
        width: 100% !important;
    }

    .preview-content {
        padding: 0;
    }
}

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

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

/* ===== Selection Styles ===== */
::selection {
    background: var(--accent-primary);
    color: white;
}

/* ===== Loading Animation ===== */
.loading {
    position: relative;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    inset: 0;
    background: inherit;
    display: flex;
    align-items: center;
    justify-content: center;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}