/* ========================================
   Markdown to HTML Converter - Web App
   Author: Carlos Crespo
   ======================================== */

:root {
    --color-bg: #f5f7fa;
    --color-surface: #ffffff;
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-secondary: #64748b;
    --color-secondary-hover: #475569;
    --color-text: #1e293b;
    --color-text-muted: #64748b;
    --color-border: #e2e8f0;
    --color-success: #22c55e;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --radius: 8px;
    --transition: 0.2s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 2rem;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--color-text-muted);
    font-size: 1.1rem;
}

/* Controls */
.controls {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    justify-content: center;
    align-items: center;
    background: var(--color-surface);
    padding: 1rem 1.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    margin-bottom: 1.5rem;
    border: 1px solid var(--color-border);
}

.control-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.control-group label {
    font-weight: 500;
    color: var(--color-text);
    font-size: 0.9rem;
}

select, input[type="text"] {
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 0.9rem;
    background: var(--color-surface);
    color: var(--color-text);
    transition: border-color var(--transition);
}

select:focus, input[type="text"]:focus {
    outline: none;
    border-color: var(--color-primary);
}

input[type="text"] {
    width: 180px;
}

/* Editor Container */
.editor-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.panel {
    background: var(--color-surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg);
}

.panel-header h2 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
}

/* Buttons */
.btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: var(--radius);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
}

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

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

.btn-secondary {
    background: var(--color-border);
    color: var(--color-text);
}

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

.btn-group {
    display: flex;
    gap: 0.5rem;
}

/* Textarea */
#markdown-input {
    flex: 1;
    padding: 1.25rem;
    border: none;
    resize: none;
    font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    background: var(--color-surface);
    color: var(--color-text);
    min-height: 500px;
}

#markdown-input:focus {
    outline: none;
}

#markdown-input::placeholder {
    color: var(--color-text-muted);
}

/* Preview */
#preview-container {
    flex: 1;
    min-height: 500px;
    overflow: hidden;
}

#preview-frame {
    width: 100%;
    height: 100%;
    border: none;
    min-height: 500px;
}

/* Footer */
footer {
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

footer a {
    color: var(--color-primary);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--color-text);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    opacity: 0;
    transform: translateY(1rem);
    transition: all 0.3s ease;
    pointer-events: none;
    z-index: 1000;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

.toast.success {
    background: var(--color-success);
}

/* Responsive */
@media (max-width: 900px) {
    .container {
        padding: 1rem;
    }

    header h1 {
        font-size: 1.75rem;
    }

    .editor-container {
        grid-template-columns: 1fr;
    }

    .controls {
        flex-direction: column;
        align-items: stretch;
    }

    .control-group {
        justify-content: space-between;
    }

    input[type="text"] {
        width: 100%;
        flex: 1;
    }
}