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

:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --bg-input: #0d1117;
    --border: #30363d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #484f58;
    --accent: #c9873b;
    --accent-dim: #8b5e28;
    --accent-glow: rgba(201, 135, 59, 0.15);
    --success: #3fb950;
    --warning: #d29922;
    --error: #f85149;
    --stat-good: #58a6ff;
    --stat-great: #3fb950;
    --sidebar-width: 260px;
}

html, body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
    font-size: 14px;
    color: var(--text-primary);
    background: var(--bg-primary);
}

#app {
    display: flex;
    height: 100vh;
}

/* Sidebar */
#sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    transition: margin-left 0.2s ease;
}

#sidebar.collapsed {
    margin-left: calc(-1 * var(--sidebar-width));
}

.sidebar-header {
    padding: 12px;
    border-bottom: 1px solid var(--border);
}

#new-chat-btn {
    width: 100%;
    padding: 10px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s;
}

#new-chat-btn:hover {
    background: var(--accent-glow);
    border-color: var(--accent-dim);
}

.sidebar-section {
    padding: 8px 0;
    flex: 1;
    min-height: 0;
    overflow-y: auto;
}

.sidebar-title {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    padding: 8px 14px 6px;
}

.conv-item, .build-item {
    padding: 6px 10px 6px 14px;
    cursor: pointer;
    border-left: 3px solid transparent;
    transition: background 0.1s, border-color 0.1s;
    display: flex;
    align-items: center;
    gap: 4px;
}

.conv-item-main, .build-item-main {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.conv-item:hover, .build-item:hover {
    background: var(--bg-tertiary);
}

.conv-item.active {
    background: var(--accent-glow);
    border-left-color: var(--accent);
}

.conv-item .conv-title {
    font-size: 13px;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.conv-item .conv-time {
    font-size: 11px;
    color: var(--text-muted);
}

.build-item .build-name {
    font-size: 13px;
    color: var(--accent);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.build-item .build-info {
    font-size: 11px;
    color: var(--text-muted);
}

.build-item-actions {
    display: flex;
    gap: 4px;
    align-items: center;
}

.delete-btn {
    opacity: 0;
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 16px;
    cursor: pointer;
    padding: 2px 6px;
    border-radius: 4px;
    transition: opacity 0.15s, color 0.15s, background 0.15s;
    flex-shrink: 0;
}

.conv-item:hover .delete-btn,
.build-item:hover .delete-btn {
    opacity: 1;
}

.delete-btn:hover {
    color: var(--error);
    background: rgba(248, 81, 73, 0.1);
}

.compare-btn {
    opacity: 0;
    background: none;
    border: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 10px;
    font-weight: 700;
    cursor: pointer;
    padding: 2px 5px;
    border-radius: 3px;
    transition: opacity 0.15s, color 0.15s, background 0.15s;
    flex-shrink: 0;
}

.build-item:hover .compare-btn {
    opacity: 1;
}

.compare-btn.compare-selected,
.build-item.compare-selected .compare-btn {
    opacity: 1;
    background: var(--accent);
    border-color: var(--accent);
    color: var(--bg-primary);
}

#compare-bar {
    padding: 8px 14px;
    display: flex;
    gap: 6px;
    border-top: 1px solid var(--border);
}

#compare-bar button {
    flex: 1;
    padding: 8px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    border: none;
}

#compare-bar button:first-child {
    background: var(--accent);
    color: var(--bg-primary);
}

#compare-bar .compare-cancel {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

.sidebar-empty {
    padding: 12px 14px;
    font-size: 12px;
    color: var(--text-muted);
    font-style: italic;
}

/* Main panel */
#main-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    max-width: 100%;
}

header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    border-bottom: 1px solid var(--border);
    background: var(--bg-secondary);
}

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

#sidebar-toggle {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 20px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    transition: background 0.15s;
}

#sidebar-toggle:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    font-size: 24px;
    color: var(--accent);
}

.logo h1 {
    font-size: 20px;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: 2px;
}

.logo-sub {
    font-size: 12px;
    color: var(--text-secondary);
    padding-left: 8px;
    border-left: 1px solid var(--border);
}

.header-meta {
    font-size: 12px;
    color: var(--text-muted);
    padding: 4px 10px;
    border: 1px solid var(--border);
    border-radius: 12px;
}

main {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    scroll-behavior: smooth;
}

#messages {
    display: flex;
    flex-direction: column;
    gap: 16px;
    max-width: 800px;
    margin: 0 auto;
}

.message {
    display: flex;
    gap: 12px;
    animation: slideIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slideIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

.message-content {
    max-width: 100%;
    line-height: 1.6;
}

.message.user .message-content {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 12px 16px;
    margin-left: auto;
    max-width: 80%;
}

.message.assistant .message-content {
    flex: 1;
}

.message.system .message-content {
    background: var(--accent-glow);
    border: 1px solid var(--accent-dim);
    border-radius: 12px;
    padding: 16px 20px;
}

.message-content p {
    margin-bottom: 8px;
}

.message-content p:last-child {
    margin-bottom: 0;
}

.message-content h2, .message-content h3, .message-content h4 {
    margin: 12px 0 6px;
    color: var(--text-primary);
}

.message-content ul {
    margin: 4px 0 8px 20px;
}

.message-content li {
    margin: 4px 0;
}

.message-content strong {
    color: var(--accent);
}

.message-content em {
    color: var(--text-secondary);
    font-style: italic;
}

.message-content code {
    background: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 13px;
}

.message-content a {
    color: var(--accent);
    text-decoration: none;
    cursor: pointer;
}

.message-content a:hover {
    text-decoration: underline;
}

.examples {
    font-size: 13px;
    color: var(--text-secondary);
}

ul.examples {
    list-style: none;
    margin: 6px 0 0 0;
}

ul.examples li {
    padding: 4px 0;
}

ul.examples a {
    color: var(--text-secondary);
    transition: color 0.15s;
}

ul.examples a:hover {
    color: var(--accent);
}

/* Build card */
.build-card {
    background: var(--bg-secondary);
    border: 1px solid var(--accent-dim);
    border-radius: 8px;
    padding: 16px;
    margin: 12px 0;
}

.build-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 8px;
}

.build-card h3 {
    color: var(--accent);
    font-size: 16px;
    margin: 0;
}

.build-actions {
    display: flex;
    gap: 6px;
}

.build-action-btn {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 12px;
    padding: 4px 10px;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.15s;
}

.build-action-btn:hover {
    background: var(--accent-glow);
    border-color: var(--accent-dim);
    color: var(--text-primary);
}

.build-action-btn.copied {
    background: var(--success);
    border-color: var(--success);
    color: var(--bg-primary);
}

.build-card .build-meta {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 12px;
    font-size: 13px;
    color: var(--text-secondary);
}

.build-card .build-meta span {
    padding: 2px 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
}

.build-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 8px;
    margin: 12px 0;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    padding: 6px 10px;
    background: var(--bg-primary);
    border-radius: 4px;
    font-size: 13px;
}

.stat-item .stat-label {
    color: var(--text-secondary);
}

.stat-item .stat-value {
    color: var(--stat-good);
    font-weight: 600;
    font-family: 'Consolas', 'Monaco', monospace;
}

.stat-item .stat-value.good { color: var(--stat-good); }
.stat-item .stat-value.great { color: var(--stat-great); }
.stat-item .stat-value.warn { color: var(--warning); }
.stat-item .stat-value.bad { color: var(--error); }

/* Thinking indicator */
#thinking-indicator {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 16px;
    font-size: 13px;
    color: var(--text-muted);
    max-width: 800px;
    margin: 0 auto;
}

#thinking-indicator.hidden {
    display: none;
}

.thinking-dots {
    display: flex;
    gap: 4px;
    align-items: center;
}

.thinking-dot {
    width: 6px;
    height: 6px;
    background: var(--accent);
    border-radius: 50%;
    animation: bounce 1.4s ease-in-out infinite;
}

.thinking-dot:nth-child(2) { animation-delay: 0.16s; }
.thinking-dot:nth-child(3) { animation-delay: 0.32s; }

@keyframes bounce {
    0%, 80%, 100% { opacity: 0.3; transform: scale(0.8); }
    40% { opacity: 1; transform: scale(1.2); }
}

/* Loading skeleton */
.skeleton-msg {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 16px;
    max-width: 800px;
    margin: 0 auto;
    animation: shimmer 1.5s ease-in-out infinite;
}

.skeleton-line {
    height: 14px;
    background: var(--bg-tertiary);
    border-radius: 4px;
}

.skeleton-line:nth-child(1) { width: 75%; }
.skeleton-line:nth-child(2) { width: 90%; }
.skeleton-line:nth-child(3) { width: 60%; }

@keyframes shimmer {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 0.8; }
}

/* Footer / input */
footer {
    padding: 12px 20px 16px;
    border-top: 1px solid var(--border);
    background: var(--bg-secondary);
}

#chat-form {
    display: flex;
    gap: 10px;
    align-items: flex-end;
    max-width: 800px;
    margin: 0 auto;
}

#user-input {
    flex: 1;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    padding: 10px 14px;
    font-size: 14px;
    font-family: inherit;
    resize: none;
    outline: none;
    transition: border-color 0.15s, box-shadow 0.15s;
    min-height: 44px;
    max-height: 160px;
    overflow-y: auto;
}

#user-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

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

#send-btn {
    background: var(--accent);
    color: var(--bg-primary);
    border: none;
    border-radius: 8px;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s, transform 0.1s;
    white-space: nowrap;
}

#send-btn:hover {
    background: #d99a4e;
}

#send-btn:active:not(:disabled) {
    transform: scale(0.96);
}

#send-btn:disabled {
    background: var(--accent-dim);
    cursor: not-allowed;
}

.input-hint {
    font-size: 10px;
    color: var(--text-muted);
    text-align: center;
    margin-top: 4px;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.2s, opacity 0.2s;
}

footer:focus-within .input-hint {
    max-height: 20px;
    opacity: 1;
}

.disclaimer {
    text-align: center;
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 8px;
}

/* Scrollbar */
main::-webkit-scrollbar, #sidebar::-webkit-scrollbar, .sidebar-section::-webkit-scrollbar {
    width: 6px;
}

main::-webkit-scrollbar-track, #sidebar::-webkit-scrollbar-track, .sidebar-section::-webkit-scrollbar-track {
    background: transparent;
}

main::-webkit-scrollbar-thumb, #sidebar::-webkit-scrollbar-thumb, .sidebar-section::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

main::-webkit-scrollbar-thumb:hover, #sidebar::-webkit-scrollbar-thumb:hover, .sidebar-section::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Compare modal */
#compare-modal {
    position: fixed;
    inset: 0;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
}

.compare-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
}

.compare-content {
    position: relative;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    width: 90%;
    max-width: 700px;
    max-height: 85vh;
    overflow-y: auto;
    padding: 20px;
}

.compare-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.compare-header h3 {
    color: var(--accent);
    font-size: 18px;
    margin: 0;
}

.compare-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 24px;
    cursor: pointer;
    padding: 0 4px;
}

.compare-close:hover {
    color: var(--text-primary);
}

.compare-names {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.compare-name {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
    text-align: center;
}

.compare-name strong {
    color: var(--accent);
    font-size: 14px;
}

.compare-name span {
    font-size: 11px;
    color: var(--text-muted);
}

.compare-vs {
    font-size: 14px;
    font-weight: 700;
    color: var(--text-muted);
    padding: 0 4px;
}

.compare-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.compare-table th {
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 6px 8px;
    border-bottom: 1px solid var(--border);
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 120px;
}

.compare-table td {
    padding: 6px 8px;
    border-bottom: 1px solid var(--bg-tertiary);
    text-align: center;
}

.compare-label {
    color: var(--text-secondary);
    font-weight: 500;
    white-space: nowrap;
}

.compare-val {
    font-family: 'Consolas', 'Monaco', monospace;
    color: var(--text-primary);
}

.compare-val.winner {
    color: var(--stat-great);
    font-weight: 700;
}

.compare-val.loser {
    color: var(--text-muted);
}

.compare-diff {
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 11px;
}

.diff-up { color: var(--stat-great); }
.diff-down { color: var(--error); }
.diff-same { color: var(--text-muted); }

.compare-footer {
    margin-top: 16px;
    text-align: center;
}

.compare-footer button {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 8px 24px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
}

.compare-footer button:hover {
    background: var(--accent-glow);
    border-color: var(--accent-dim);
}

/* PoB Export Modal */
#pob-modal {
    position: fixed;
    inset: 0;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
}

.pob-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
}

.pob-content {
    position: relative;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    width: 90%;
    max-width: 560px;
    padding: 20px;
}

.pob-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.pob-header h3 {
    color: var(--accent);
    font-size: 16px;
    margin: 0;
}

.pob-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 24px;
    cursor: pointer;
    padding: 0 4px;
}

.pob-close:hover {
    color: var(--text-primary);
}

.pob-instructions {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.pob-code {
    width: 100%;
    height: 120px;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    font-family: monospace;
    font-size: 11px;
    padding: 10px;
    resize: none;
    word-break: break-all;
}

.pob-code:focus {
    outline: none;
    border-color: var(--accent-dim);
}

.pob-footer {
    display: flex;
    gap: 8px;
    justify-content: flex-end;
    margin-top: 12px;
}

.pob-footer button {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 8px 20px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
}

.pob-footer button:hover {
    background: var(--accent-glow);
    border-color: var(--accent-dim);
}

.pob-copy-btn {
    background: var(--accent) !important;
    color: var(--bg-primary) !important;
    border-color: var(--accent) !important;
    font-weight: 600;
}

.pob-copy-btn:hover {
    opacity: 0.9;
}

.pob-export-btn {
    background: var(--accent-dim) !important;
    color: var(--text-primary) !important;
    border-color: var(--accent) !important;
}

/* Leveling Guide */
.leveling-guide {
    margin-top: 12px;
    border-top: 1px solid var(--border);
    padding-top: 8px;
}

.lg-toggle {
    background: none;
    border: 1px solid var(--border);
    color: var(--accent);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    padding: 6px 12px;
    border-radius: 6px;
    width: 100%;
    text-align: left;
    transition: background 0.15s;
}

.lg-toggle:hover {
    background: var(--accent-glow);
}

.lg-toggle-icon {
    font-size: 10px;
    margin-right: 4px;
}

.lg-content {
    margin-top: 8px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.lg-content.hidden {
    display: none;
}

.lg-phase {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 10px 12px;
}

.lg-phase-header {
    font-weight: 600;
    color: var(--accent);
    font-size: 13px;
    margin-bottom: 6px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.lg-level {
    font-size: 11px;
    font-weight: 400;
    color: var(--text-secondary);
    background: var(--bg-tertiary);
    padding: 1px 6px;
    border-radius: 4px;
}

.lg-row {
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-top: 3px;
}

.lg-icon {
    margin-right: 4px;
}

/* Responsive */
@media (max-width: 768px) {
    #sidebar {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        z-index: 100;
        margin-left: 0;
    }

    #sidebar.collapsed {
        margin-left: calc(-1 * var(--sidebar-width));
    }

    .sidebar-overlay {
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 99;
    }

    #main-panel {
        width: 100%;
    }

    main {
        padding: 12px;
    }

    footer {
        padding: 10px 14px 14px;
    }

    .message.user .message-content {
        max-width: 90%;
    }

    .build-stats {
        grid-template-columns: repeat(2, 1fr);
    }
}