:root {
    --primary: #0284c7;
    --primary-hover: #0369a1;
    --bg-main: #f8fafc;
    --sidebar-bg: #0f172a;
    --sidebar-text: #94a3b8;
    --text-dark: #334155;
    --text-muted: #64748b;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --pain-bg: #fff8e6;
    --pain-border: #f59e0b;
}

@media (prefers-color-scheme: dark) {
    :root {
        --primary: #38bdf8;
        --bg-main: #0f172a;
        --card-bg: #1e293b;
        --text-dark: #f1f5f9;
        --text-muted: #94a3b8;
        --border-color: #334155;
        --pain-bg: #1e293b;
        --pain-border: #f59e0b;
    }
}

* { box-sizing: border-box; margin: 0; padding: 0; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
body { display: flex; min-height: 100vh; background-color: var(--bg-main); color: var(--text-dark); }

/* Sidebar */
.sidebar { width: 260px; background-color: var(--sidebar-bg); padding: 25px 20px; display: flex; flex-direction: column; position: fixed; height: 100vh; overflow-y: auto; }
.brand h2 { color: #ffffff; font-size: 1.5rem; }
.brand p { color: var(--sidebar-text); font-size: 0.8rem; margin-top: 4px; margin-bottom: 25px; }
.nav-links { display: flex; flex-direction: column; gap: 8px; }
.nav-btn { background: none; border: none; color: var(--sidebar-text); padding: 12px 15px; text-align: left; font-size: 0.95rem; font-weight: 500; border-radius: 6px; cursor: pointer; transition: 0.2s; }
.nav-btn:hover, .nav-btn.active { background-color: #1e293b; color: #ffffff; }

/* Main Content */
.content { margin-left: 260px; padding: 40px; flex: 1; max-width: 1000px; }
.page-section { display: none; }
.page-section.active { display: block; }

.main-header { font-size: 2.2rem; font-weight: 800; color: var(--primary); margin-bottom: 6px; }
.sub-header { color: var(--text-muted); font-size: 1.05rem; margin-bottom: 30px; }

/* Mobile Responsive */
@media (max-width: 768px) {
    body { flex-direction: column; }
    .sidebar { position: relative; width: 100%; height: auto; padding: 20px; }
    .brand h2 { font-size: 1.3rem; }
    .brand p { font-size: 0.75rem; }
    .nav-links { gap: 8px; }
    .nav-btn { padding: 10px 12px; font-size: 0.9rem; }
    
    .content { margin-left: 0; padding: 20px; }
    .main-header { font-size: 1.6rem; }
    .sub-header { font-size: 0.95rem; }
    
    .repo-header { flex-direction: column; }
    .repo-stats { text-align: left; margin-top: 10px; }
    
    .footer { flex-direction: column; gap: 10px; }
    .form-group input, .form-group textarea { font-size: 16px; }
}

@media (max-width: 480px) {
    .sidebar { padding: 15px; }
    .brand h2 { font-size: 1.1rem; }
    .nav-btn { padding: 8px 10px; font-size: 0.85rem; }
    
    .content { padding: 15px; }
    .main-header { font-size: 1.4rem; }
    .sub-header { font-size: 0.9rem; margin-bottom: 20px; }
    
    .repo-card { padding: 15px; margin-bottom: 15px; }
    .repo-title { font-size: 1.1rem; }
    .badge { font-size: 0.7rem; padding: 2px 6px; }
    
    .text-card, .form-card { padding: 15px; }
    .text-card h3, .form-card h3 { font-size: 1.1rem; }
    
    .submit-btn { padding: 8px 16px; font-size: 0.9rem; }
}

/* Repository Cards */
.repo-card { background: var(--card-bg); border: 1px solid var(--border-color); border-radius: 8px; padding: 20px; margin-bottom: 20px; }
.repo-header { display: flex; justify-content: space-between; align-items: flex-start; }
.repo-title { font-size: 1.25rem; font-weight: 700; }
.repo-title a { color: var(--primary); text-decoration: none; }
.repo-title a:hover { text-decoration: underline; }
.repo-stats { text-align: right; font-size: 0.85rem; color: var(--text-muted); }
.badge { display: inline-block; padding: 3px 8px; border-radius: 12px; background: var(--primary); color: #fff; font-size: 0.75rem; font-weight: bold; margin-top: 5px; }
.pain-point { background-color: var(--pain-bg); border-left: 4px solid var(--pain-border); padding: 12px; margin-top: 15px; border-radius: 4px; font-size: 0.92rem; }

.repo-discussion { margin-top: 18px; }
.discussion-toggle {
    width: 100%;
    border: 1px solid var(--border-color);
    background: var(--bg-main);
    color: var(--text-dark);
    border-radius: 8px;
    padding: 10px 12px;
    cursor: pointer;
    text-align: left;
    font-size: 0.95rem;
    font-weight: 600;
}
.discussion-toggle:hover { border-color: var(--primary); }
.discussion-panel { margin-top: 12px; border: 1px solid var(--border-color); border-radius: 8px; padding: 12px; background: rgba(2, 132, 199, 0.02); }
.discussion-panel.hidden { display: none; }
.discussion-list { display: flex; flex-direction: column; gap: 10px; margin-bottom: 12px; }
.discussion-item { background: var(--card-bg); border: 1px solid var(--border-color); border-radius: 6px; padding: 10px 12px; }
.discussion-meta { display: flex; justify-content: space-between; gap: 10px; font-size: 0.82rem; color: var(--text-muted); margin-bottom: 6px; }
.discussion-item p { color: var(--text-dark); line-height: 1.5; white-space: pre-wrap; }
.discussion-empty { color: var(--text-muted); font-size: 0.92rem; padding: 10px 0; }
.discussion-form { display: flex; flex-direction: column; gap: 10px; }
.discussion-form-row input,
.discussion-form-row textarea {
    width: 100%;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--card-bg);
    color: var(--text-dark);
    padding: 10px 12px;
    font-size: 0.95rem;
}
.discussion-submit {
    align-self: flex-start;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 6px;
    padding: 10px 16px;
    font-weight: 600;
    cursor: pointer;
}
.discussion-submit:hover { background: var(--primary-hover); }

/* Archive Selector */
.archive-selector { margin-bottom: 30px; }
.archive-selector label { display: block; font-size: 0.95rem; font-weight: 600; margin-bottom: 10px; }
.archive-selector select { width: 100%; padding: 10px; border: 1px solid var(--border-color); border-radius: 6px; background: var(--card-bg); color: var(--text-dark); font-size: 1rem; }

/* Text Cards & Form */
.text-card, .form-card { background: var(--card-bg); border: 1px solid var(--border-color); border-radius: 8px; padding: 25px; line-height: 1.6; }
.form-group { margin-bottom: 15px; }
.form-group label { display: block; font-size: 0.9rem; font-weight: 600; margin-bottom: 5px; }
.form-group input, .form-group textarea { width: 100%; padding: 12px; border: 1px solid var(--border-color); border-radius: 6px; background: var(--bg-main); color: var(--text-dark); font-size: 1rem; -webkit-appearance: none; appearance: none; }
.submit-btn { background: var(--primary); color: white; border: none; padding: 12px 24px; font-weight: bold; border-radius: 6px; cursor: pointer; font-size: 1rem; min-height: 44px; }
.submit-btn:hover { background: var(--primary-hover); }

/* Footer */
.footer { margin-top: 50px; padding-top: 20px; border-top: 1px solid var(--border-color); font-size: 0.85rem; color: var(--text-muted); display: flex; justify-content: space-between; }
.footer a { color: var(--primary); text-decoration: none; }