:root {
    --bg: #0d1117;
    --terminal-bg: #161b22;
    --terminal-border: #30363d;
    --user-color: #9ca3af;
    --assistant-color: #e6edf3;
    --system-color: #484f58;
    --header-color: #58a6ff;
    --focus-border: #58a6ff;
    --focus-bg: #1c2333;
    --user-focus-border: #3fb950;
    --user-focus-bg: #1a2332;
    --scrollbar-thumb: #30363d;
    --scrollbar-track: transparent;
    --font-mono: "Mononoki Nerd Font Mono", Hack, "Berkeley Mono", "JetBrains Mono", "Fira Code", "SF Mono", "Cascadia Code", Menlo, Consolas, "DejaVu Sans Mono", monospace;
}

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

html {
    font-size: 14px;
}

body {
    background: var(--bg);
    color: var(--assistant-color);
    font-family: var(--font-mono);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 0;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--scrollbar-track);
}
::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
}

/* Terminal window */
.terminal-window {
    width: 100%;
    min-height: 100vh;
    background: var(--terminal-bg);
    position: relative;
}

@media (min-width: 1040px) {
    body {
        padding: 24px;
    }
    .terminal-window {
        width: fit-content;
        min-height: auto;
        border: 1px solid var(--terminal-border);
        border-radius: 8px;
        overflow: hidden;
    }
}

/* Title bar */
.title-bar {
    display: none;
    height: 38px;
    background: #1c2128;
    border-bottom: 1px solid var(--terminal-border);
    align-items: center;
    padding: 0 16px;
    gap: 8px;
    user-select: none;
    position: sticky;
    top: 0;
    z-index: 10;
}

@media (min-width: 1040px) {
    .title-bar {
        display: flex;
    }
}

.title-bar .dots {
    display: flex;
    gap: 6px;
}
.title-bar .dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}
.title-bar .dot.red { background: #ff5f57; }
.title-bar .dot.yellow { background: #febc2e; }
.title-bar .dot.green { background: #28c840; }

.title-bar .title {
    flex: 1;
    text-align: center;
    color: var(--user-color);
    font-size: 12px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Messages */
.message {
    position: relative;
    padding: 1px;
    border: 1px solid transparent;
    transition: border-color 0.15s ease, background-color 0.15s ease;
    cursor: pointer;
    margin-bottom: 1em;
}

.message:hover {
    background: rgba(88, 166, 255, 0.04);
}
.message.user:hover {
    background: rgba(63, 185, 80, 0.04);
}

.message.focused {
    border-color: var(--focus-border);
    background: var(--focus-bg);
}
.message.user.focused {
    border-color: var(--user-focus-border);
    background: var(--user-focus-bg);
}

.message pre {
    font-family: inherit;
    white-space: pre-wrap;
    word-wrap: break-word;
    font-size: inherit;
    line-height: calc(1em + 1px);
}

/* Role-specific styles */
.message.user pre {
    color: var(--user-color);
}

.message.assistant pre {
    color: var(--assistant-color);
}

.message.system {
    cursor: default;
}
.message.system pre {
    color: var(--system-color);
    font-size: 12px;
    font-style: italic;
}

.message.header {
    cursor: default;
    margin-top: 1em;
}
.message.header pre {
    color: var(--header-color);
    line-height: 1em;
}

/* Inline title (narrow screens) */
.inline-title {
    color: var(--user-color);
    margin-bottom: 1em;
    border-bottom: 1px solid var(--user-color);
    padding: 1px;
}

@media (min-width: 1040px) {
    .inline-title {
        display: none;
    }
}

/* Write-file collapsible messages */
.message.write-file pre {
    --wf-visible-lines: 10;
    max-height: calc(var(--wf-visible-lines) * (1em + 1px));
    overflow: hidden;
    position: relative;
}

.message.write-file::after {
    content: '▼ show more';
    display: block;
    padding: 2px 6px;
    font-size: 11px;
    color: var(--system-color);
    cursor: pointer;
    user-select: none;
}

.message.write-file.expanded pre {
    max-height: none;
}

.message.write-file.expanded::after {
    content: '▲ show less';
}

/* Navigation hint */
.nav-hint {
    position: fixed;
    bottom: 16px;
    right: 16px;
    background: rgba(22, 27, 34, 0.9);
    border: 1px solid var(--terminal-border);
    padding: 8px 14px;
    font-size: 11px;
    color: var(--system-color);
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 100;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.nav-hint.visible {
    opacity: 1;
}

.nav-hint kbd {
    display: inline-block;
    padding: 1px 5px;
    font-family: inherit;
    font-size: 11px;
    background: var(--terminal-border);
    margin: 0 2px;
}