/* ftextarea - A simple full-screen textarea */

:root {
    /* Dark theme (default) */
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    --accent: #58a6ff;
    --accent-hover: #79b8ff;
    --border: #30363d;
    --placeholder: #484f58;
    --font-mono: ui-monospace, "SF Mono", "Cascadia Code", "Segoe UI Mono", Consolas, monospace;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: light) {
    :root {
        --bg-primary: #ffffff;
        --bg-secondary: #f6f8fa;
        --bg-tertiary: #eaeef2;
        --text-primary: #1f2328;
        --text-secondary: #656d76;
        --text-muted: #8b949e;
        --accent: #0969da;
        --accent-hover: #0550ae;
        --border: #d0d7de;
        --placeholder: #8b949e;
    }
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    height: 100%;
    width: 100%;
    overflow: hidden;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    display: flex;
    flex-direction: column;
}

/* Main textarea area */
main {
    flex: 1;
    display: flex;
    padding: 1rem;
    padding-bottom: 0;
}

#editor {
    flex: 1;
    width: 100%;
    resize: none;
    border: none;
    outline: none;
    background: transparent;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 1rem;
    line-height: 1.6;
    padding: 0.5rem;
}

#editor::placeholder {
    color: var(--placeholder);
    opacity: 1;
}

/* Footer */
footer {
    padding: 0.75rem 1rem;
    text-align: center;
}

#info-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    cursor: pointer;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: color 0.15s ease, background-color 0.15s ease;
}

#info-btn:hover,
#info-btn:focus {
    color: var(--accent);
    background: var(--bg-secondary);
    outline: none;
}

/* Modal (native dialog element) */
dialog {
    position: fixed;
    inset: 0;
    width: min(90vw, 480px);
    max-height: 85vh;
    margin: auto;
    padding: 0;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    overflow: hidden;
}

dialog::backdrop {
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
}

dialog article {
    padding: 1.5rem;
    overflow-y: auto;
    max-height: 85vh;
}

dialog h1 {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--accent);
}

dialog h2 {
    font-size: 1rem;
    font-weight: 600;
    margin-top: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

dialog p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 0.5rem;
}

dialog ul {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-left: 1.5rem;
    margin-bottom: 0.75rem;
}

dialog li {
    margin-bottom: 0.25rem;
}

dialog .note {
    font-size: 0.875rem;
    color: var(--text-muted);
    background: var(--bg-tertiary);
    padding: 0.75rem 1rem;
    border-radius: 6px;
    margin-top: 1rem;
}

dialog .links {
    margin-top: 0.75rem;
}

dialog .links a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.15s ease;
}

dialog .links a:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

dialog .separator {
    color: var(--text-muted);
    margin: 0 0.5rem;
}

dialog #close-modal {
    display: block;
    width: 100%;
    margin-top: 1.5rem;
    padding: 0.75rem 1rem;
    background: var(--accent);
    color: #ffffff;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.15s ease;
}

dialog #close-modal:hover,
dialog #close-modal:focus {
    background: var(--accent-hover);
    outline: none;
}

/* Focus visible for accessibility */
:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Remove focus outline for mouse users */
:focus:not(:focus-visible) {
    outline: none;
}