/* ===== CSS Variables ===== */
:root {
    /* Light Theme (Default) */
    --bg-primary: #ffffff;
    --bg-secondary: #f6f8fa;
    --bg-tertiary: #eaeef2;
    --border-color: #d0d7de;
    --text-primary: #1f2328;
    --text-secondary: #656d76;
    --accent-color: #0969da;
    --accent-hover: #0550ae;
    --success-color: #1a7f37;
    --error-color: #cf222e;
    --warning-color: #9a6700;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', Consolas, monospace;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --radius: 8px;
    --shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --border-color: #30363d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --accent-color: #58a6ff;
    --accent-hover: #79b8ff;
    --success-color: #3fb950;
    --error-color: #f85149;
    --warning-color: #d29922;
    --shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

/* Auto dark mode when system prefers dark */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg-primary: #0d1117;
        --bg-secondary: #161b22;
        --bg-tertiary: #21262d;
        --border-color: #30363d;
        --text-primary: #e6edf3;
        --text-secondary: #8b949e;
        --accent-color: #58a6ff;
        --accent-hover: #79b8ff;
        --success-color: #3fb950;
        --error-color: #f85149;
        --warning-color: #d29922;
        --shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    }
}

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

html,
body {
    height: 100%;
}

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

/* ===== Container ===== */
.container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-width: 1400px;
    margin: 0 auto;
    padding: 16px;
    gap: 16px;
}

/* ===== Header ===== */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    font-size: 28px;
}

.logo h1 {
    font-size: 24px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-color), #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.status {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-secondary);
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--text-secondary);
}

.status-dot.loading {
    background: var(--warning-color);
    animation: pulse 1.5s infinite;
}

.status-dot.ready {
    background: var(--success-color);
}

.status-dot.running {
    background: var(--accent-color);
    animation: pulse 0.8s infinite;
}

.status-dot.error {
    background: var(--error-color);
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.4;
    }
}

/* ===== Main Layout ===== */
.main {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    min-height: 0;
}

/* ===== Panel ===== */
.panel {
    display: flex;
    flex-direction: column;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    overflow: hidden;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.panel-title {
    font-weight: 600;
    font-size: 14px;
}

.panel-footer {
    display: flex;
    gap: 12px;
    padding: 12px 16px;
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
}

/* ===== Examples Select ===== */
.examples-select {
    padding: 6px 12px;
    font-size: 13px;
    font-family: var(--font-sans);
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    transition: border-color 0.2s;
}

.examples-select:hover {
    border-color: var(--accent-color);
}

.examples-select:focus {
    outline: none;
    border-color: var(--accent-color);
}

/* ===== Editor ===== */
.editor-wrapper {
    flex: 1;
    min-height: 0;
    overflow: hidden;
}

#code {
    width: 100%;
    height: 100%;
    padding: 16px;
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.6;
    background: var(--bg-primary);
    color: var(--text-primary);
    border: none;
    resize: none;
    outline: none;
    tab-size: 4;
}

#code::placeholder {
    color: var(--text-secondary);
}

/* ===== Buttons ===== */
.run-btn,
.clear-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 600;
    font-family: var(--font-sans);
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
}

.run-btn {
    background: linear-gradient(135deg, var(--accent-color), #a855f7);
    color: white;
}

.run-btn:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(88, 166, 255, 0.4);
}

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

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

.clear-btn:hover {
    color: var(--text-primary);
    border-color: var(--text-secondary);
}

.btn-icon {
    font-size: 12px;
}

/* ===== Output ===== */
.output-wrapper {
    flex: 1;
    min-height: 0;
    overflow: auto;
    background: var(--bg-primary);
}

.output {
    padding: 16px;
    margin: 0;
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.6;
    white-space: pre-wrap;
    word-break: break-all;
    color: var(--text-primary);
}

.output.error {
    color: var(--error-color);
}

.output-time {
    font-size: 12px;
    color: var(--text-secondary);
}

/* ===== Footer ===== */
.footer {
    text-align: center;
    padding: 12px;
    font-size: 13px;
    color: var(--text-secondary);
}

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

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

/* ===== Theme Toggle ===== */
.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.icon-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    font-family: var(--font-sans);
}

.icon-btn:hover {
    border-color: var(--accent-color);
    transform: scale(1.05);
}

.theme-icon.dark {
    display: none;
}

/* Show moon icon when in dark mode */
[data-theme="dark"] .theme-icon.light {
    display: none;
}

[data-theme="dark"] .theme-icon.dark {
    display: inline;
}

/* Auto dark mode icon switch */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .theme-icon.light {
        display: none;
    }

    :root:not([data-theme="light"]) .theme-icon.dark {
        display: inline;
    }
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .container {
        padding: 12px;
    }

    .main {
        grid-template-columns: 1fr;
        grid-template-rows: 1fr 1fr;
    }

    .header {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }

    .panel-footer {
        justify-content: center;
    }
}

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

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

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

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