:root {
    --bg-dark: #0f172a;
    --bg-card: rgba(30, 41, 59, 0.7);
    --primary: #38bdf8;
    --primary-hover: #0ea5e9;
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --border: rgba(255, 255, 255, 0.1);
    --glass: rgba(255, 255, 255, 0.03);
    --accent: #818cf8;
}

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

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    height: 100vh;
    overflow: hidden;
    background: radial-gradient(circle at top right, #1e293b, #0f172a);
    font-size: 16px;
}

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 1rem;
    background: var(--glass);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    z-index: 10;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.logo {
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary);
    white-space: nowrap;
}

.logo-img {
    height: 24px;
    width: auto;
    filter: drop-shadow(0 0 8px rgba(56, 189, 248, 0.3));
}

.logo strong {
    color: var(--text-main);
    font-weight: 600;
}

.toolbar {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

button,
.btn-secondary {
    background: var(--glass);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.75rem;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.3rem;
    white-space: nowrap;
}

button:hover,
.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-1px);
}

.btn-primary {
    background: var(--primary);
    color: #000;
    font-weight: 600;
    border: none;
}

.btn-primary:hover {
    background: var(--primary-hover);
    box-shadow: 0 0 15px rgba(56, 189, 248, 0.4);
}

/* Layout */
.editor-layout {
    display: flex;
    flex-direction: column;
    flex: 1;
    overflow: hidden;
}

.editor-pane,
.preview-pane {
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
    flex: 1;
}

.editor-pane {
    border-bottom: 1px solid var(--border);
    height: 50%;
}

.preview-pane {
    height: 50%;
}

.pane-header {
    padding: 0.4rem 0.75rem;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    background: rgba(0, 0, 0, 0.2);
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

textarea#markdown-input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-main);
    font-family: 'Fira Code', monospace;
    font-size: 0.875rem;
    padding: 1rem;
    resize: none;
    outline: none;
    line-height: 1.5;
    overflow-y: auto;
}

#html-output {
    flex: 1;
    padding: 1rem;
    overflow-y: auto;
    line-height: 1.5;
}

/* Markdown Styles */
.markdown-body h1,
.markdown-body h2,
.markdown-body h3 {
    margin-top: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary);
}

.markdown-body p {
    margin-bottom: 1rem;
}

.markdown-body code {
    background: rgba(255, 255, 255, 0.1);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'Fira Code', monospace;
    font-size: 0.9em;
}

.markdown-body pre {
    background: #1e293b;
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    overflow-x: auto;
}

/* Footer */
.app-footer {
    padding: 0.4rem 0.75rem;
    background: var(--glass);
    border-top: 1px solid var(--border);
    font-size: 0.65rem;
    color: var(--text-muted);
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.5rem;
}

#status-message.success {
    color: #4ade80;
}

#status-message.error {
    color: #f87171;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Responsive Design - Mobile First Approach */

/* Tablets e acima (768px) */
@media (min-width: 768px) {
    body {
        font-size: 16px;
    }

    .app-header {
        padding: 0.75rem 1.5rem;
        flex-wrap: nowrap;
        gap: 0.75rem;
    }

    .logo {
        font-size: 1.15rem;
        gap: 0.75rem;
    }

    .logo-img {
        height: 28px;
    }

    .toolbar {
        gap: 0.75rem;
    }

    button,
    .btn-secondary {
        padding: 0.5rem 1rem;
        font-size: 0.85rem;
        gap: 0.5rem;
    }

    .editor-layout {
        flex-direction: row;
    }

    .editor-pane {
        border-bottom: none;
        border-right: 1px solid var(--border);
        height: 100%;
        width: 50%;
    }

    .preview-pane {
        height: 100%;
        width: 50%;
    }

    .pane-header {
        padding: 0.5rem 1rem;
        font-size: 0.75rem;
        gap: 0.5rem;
    }

    textarea#markdown-input {
        font-size: 0.95rem;
        padding: 1.5rem;
        line-height: 1.6;
    }

    #html-output {
        padding: 1.5rem;
        line-height: 1.6;
    }

    .app-footer {
        padding: 0.4rem 1.5rem;
        font-size: 0.8rem;
        flex-wrap: nowrap;
    }
}

/* Desktop (1024px+) */
@media (min-width: 1024px) {
    .logo {
        font-size: 1.25rem;
    }

    .logo-img {
        height: 32px;
    }

    button,
    .btn-secondary {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }

    .pane-header {
        padding: 0.5rem 1rem;
        font-size: 0.75rem;
    }

    textarea#markdown-input {
        font-size: 1rem;
        padding: 1.5rem;
    }
}

/* Landscape mode mobile (max-height) */
@media (max-height: 600px) and (orientation: landscape) {
    .app-header {
        padding: 0.4rem 0.75rem;
    }

    .pane-header {
        padding: 0.3rem 0.5rem;
    }

    textarea#markdown-input,
    #html-output {
        padding: 0.5rem;
    }

    .app-footer {
        padding: 0.3rem 0.5rem;
        font-size: 0.6rem;
    }
}