:root {
    --primary-color: #3b82f6;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --code-bg: #1e1e1e;
    --timeline-line: #cbd5e1;
}

[data-theme="dark"] {
    --primary-color: #60a5fa;
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --timeline-line: #475569;
}

[data-theme="sepia"] {
    --primary-color: #c97d4e;
    --bg-color: #f5edd6;
    --card-bg: #fcf6e8;
    --text-main: #3d3229;
    --text-muted: #8b7b6b;
    --border-color: #dcd0bc;
    --code-bg: #2d2822;
    --timeline-line: #c9b99f;
}

[data-theme="forest"] {
    --primary-color: #4a9c6f;
    --bg-color: #eaf4e8;
    --card-bg: #f6faf4;
    --text-main: #1e3a2a;
    --text-muted: #5e7a66;
    --border-color: #c8dbc8;
    --code-bg: #1a2a1e;
    --timeline-line: #a8c4a8;
}

* { box-sizing: border-box; margin: 0; padding: 0; transition: background-color 0.3s, color 0.3s; }
html { scrollbar-gutter: stable; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    padding: 20px;
}

.container { max-width: 800px; margin: 0 auto; }

header {
    margin-bottom: 40px; padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

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

h1 { font-size: 2rem; font-weight: 700; }

.header-bottom { display: flex; align-items: center; gap: 8px; position: relative; }

#tab-menu-btn {
    background: none; border: 1px solid var(--border-color);
    color: var(--text-muted); padding: 4px 10px; border-radius: 6px;
    cursor: pointer; font-size: 1.1rem; line-height: 1;
    transition: all 0.2s;
}
#tab-menu-btn:hover { background: var(--border-color); color: var(--text-main); }

.tab-dropdown {
    position: absolute; top: 100%; left: 0; margin-top: 4px;
    background: var(--card-bg); border: 1px solid var(--border-color);
    border-radius: 8px; box-shadow: 0 8px 24px rgba(0,0,0,0.15);
    min-width: 180px; max-height: 320px; overflow-y: auto;
    z-index: 100; padding: 4px;
}
.tab-dropdown.hidden { display: none; }
.tab-dropdown-item {
    display: flex; width: 100%; align-items: center; gap: 8px;
    padding: 8px 14px; border: none; border-radius: 4px;
    background: transparent; color: var(--text-main);
    font-size: 0.85rem; cursor: pointer;
}
.tab-dropdown-item:hover { background: var(--border-color); }
.tab-dropdown-item.active { background: var(--primary-color); color: white; }
.tab-dropdown-item + .tab-dropdown-item { margin-top: 2px; }

.tabs { display: flex; gap: 6px; }
.tab {
    padding: 6px 18px; border: 1px solid var(--border-color);
    background: transparent; color: var(--text-muted);
    border-radius: 6px; cursor: pointer;
    font-size: 0.85rem; font-weight: 600;
    transition: all 0.2s;
    display: inline-flex; align-items: center; gap: 6px;
}
.tab:hover { background: var(--border-color); color: var(--text-main); }
.tab.active {
    background: var(--primary-color); color: white; border-color: var(--primary-color);
}

.status-dot {
    width: 7px; height: 7px; border-radius: 50%; display: inline-block; flex-shrink: 0;
}
.status-dot.active { background: #22c55e; }
.status-dot.done { background: #94a3b8; }

#theme-toggle {
    background: none; border: 1px solid var(--border-color);
    color: var(--text-main); padding: 6px 14px; border-radius: 6px;
    cursor: pointer; font-size: 0.85rem;
}
#theme-toggle:hover { background-color: var(--border-color); }

.timeline { position: relative; padding-left: 30px; }

.timeline::before {
    content: ''; position: absolute; left: 0; top: 0; bottom: 0;
    width: 2px; background-color: var(--timeline-line);
}

.log-item { position: relative; margin-bottom: 40px; }

.log-item::before {
    content: ''; position: absolute; left: -35px; top: 24px;
    width: 12px; height: 12px; border-radius: 50%;
    background-color: var(--primary-color);
    border: 3px solid var(--bg-color);
    box-shadow: 0 0 0 1px var(--primary-color);
}

.log-card {
    background-color: var(--card-bg); border: 1px solid var(--border-color);
    border-radius: 8px; padding: 20px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.log-meta { display: flex; align-items: center; gap: 12px; margin-bottom: 10px; font-size: 0.85rem; }
.log-date { color: var(--text-muted); font-weight: 500; }

.tag { padding: 2px 8px; border-radius: 4px; font-size: 0.75rem; font-weight: 600; color: white; }
.tag.feature { background-color: #10b981; }
.tag.fix { background-color: #ef4444; }
.tag.optimization { background-color: #f59e0b; }

.log-title { margin-bottom: 12px; font-size: 1.25rem; }
.log-content { color: var(--text-muted); font-size: 0.95rem; }

pre {
    background-color: var(--code-bg); color: #d4d4d4;
    padding: 15px; border-radius: 6px; overflow-x: auto;
    margin-top: 15px; font-size: 0.85rem;
}

.error-msg {
    text-align: center; padding: 40px; color: var(--text-muted);
    font-size: 1.1rem;
}

.show-more-wrap { text-align: center; padding: 20px 0; }
.show-more-btn {
    padding: 8px 32px; border: 1px solid var(--border-color);
    background: transparent; color: var(--text-muted);
    border-radius: 20px; cursor: pointer; font-size: 0.85rem;
    transition: all 0.2s;
}
.show-more-btn:hover { background: var(--border-color); color: var(--text-main); }

@media (max-width: 600px) {
    .timeline { padding-left: 20px; }
    .log-item::before { left: -26px; width: 10px; height: 10px; }
    h1 { font-size: 1.5rem; }
    header { flex-direction: column; align-items: flex-start; }
}