/* openParticle v2.0 — 专业浅色科技风格 */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --sidebar-w: 240px;
    --nav-h: 56px;
    --accent: #e67e22;
    --accent-hover: #d4701a;
    --accent-dim: rgba(230,126,34,0.1);
    --bg-root: #f0f2f5;
    --bg-card: #fff;
    --bg-card-hover: #f8f9fa;
    --bg-sidebar: #1a1f2e;
    --bg-input: #f5f6f8;
    --bg-nav: #fff;
    --border: #e0e3e8;
    --border-light: #d1d5db;
    --text: #1a1d23;
    --text-dim: #5f6b7a;
    --text-muted: #9ca3af;
    --green: #16a34a;
    --red: #dc2626;
    --orange: #f59e0b;
    --blue: #2563eb;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-lg: 0 4px 16px rgba(0,0,0,0.1);
}

* { box-sizing: border-box; }
body {
    margin: 0; padding: 0;
    background: var(--bg-root);
    color: var(--text);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    font-size: 14px; line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

/* ===== Top Nav ===== */
.navbar {
    height: var(--nav-h); background: var(--bg-nav) !important;
    border-bottom: 1px solid var(--border); padding: 0 1.25rem !important;
    box-shadow: 0 1px 2px rgba(0,0,0,0.04);
}
.navbar-brand { font-weight: 700; font-size: 1rem; letter-spacing: 0.5px; color: var(--text) !important; }
.navbar-brand i { color: var(--accent); margin-right: 6px; }
.navbar .nav-link { color: var(--text-dim) !important; font-size: 0.85rem; padding: 0.4rem 0.8rem !important; min-height: 36px; }
.navbar .nav-link:hover { color: var(--accent) !important; }
.navbar .dropdown-menu { background: var(--bg-card); border: 1px solid var(--border); box-shadow: var(--shadow-lg); }
.navbar .dropdown-item { color: var(--text); font-size: 0.85rem; }
.navbar .dropdown-item:hover { background: var(--bg-card-hover); color: var(--accent); }

/* ===== App Layout ===== */
.app-layout { display: flex; min-height: calc(100vh - var(--nav-h)); }

/* ===== Sidebar (dark) ===== */
.app-sidebar {
    width: var(--sidebar-w); background: var(--bg-sidebar); flex-shrink: 0;
    border-right: 1px solid rgba(255,255,255,0.06); padding: 0.75rem 0;
    position: sticky; top: var(--nav-h); height: calc(100vh - var(--nav-h)); overflow-y: auto;
}
.app-sidebar .sidebar-section {
    color: rgba(255,255,255,0.35); font-size: 0.7rem; font-weight: 600;
    text-transform: uppercase; letter-spacing: 1.5px;
    padding: 0.75rem 1.2rem 0.3rem;
}
.app-sidebar .nav-link {
    color: rgba(255,255,255,0.6); padding: 0.5rem 1.2rem; font-size: 0.88rem;
    border-left: 2px solid transparent; transition: all 0.15s;
    display: flex; align-items: center; min-height: 38px;
}
.app-sidebar .nav-link i { width: 20px; margin-right: 8px; text-align: center; font-size: 0.9rem; }
.app-sidebar .nav-link:hover { color: #fff; background: rgba(255,255,255,0.06); border-left-color: var(--accent); }
.app-sidebar .nav-link.active { color: var(--accent); background: var(--accent-dim); border-left-color: var(--accent); font-weight: 500; }

/* ===== Content ===== */
.app-content { flex: 1; min-width: 0; padding: 1.25rem 1.5rem; overflow-x: hidden; }

/* ===== Cards ===== */
.card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); box-shadow: var(--shadow);
}
.card-header {
    background: var(--bg-card); border-bottom: 1px solid var(--border);
    color: var(--text); font-weight: 600; padding: 0.75rem 1rem;
}
.card-body { padding: 1rem; }
.card-footer {
    background: var(--bg-input); border-top: 1px solid var(--border);
    color: var(--text-dim); font-size: 0.8rem;
}

.import-card {
    background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
    transition: all 0.2s; border-left: 3px solid var(--blue); box-shadow: var(--shadow);
}
.import-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); border-color: var(--blue); }
.import-card .card-body { padding: 1.25rem; }

.knowledge-card {
    background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
    transition: all 0.2s; border-left: 3px solid var(--blue); box-shadow: var(--shadow);
}
.knowledge-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }

.content-preview {
    display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical;
    overflow: hidden; color: var(--text-dim); font-size: 0.85rem; line-height: 1.5;
}

/* ===== Section Title ===== */
.section-title {
    color: var(--text); font-weight: 600; font-size: 1rem;
    padding-bottom: 0.5rem; margin-bottom: 1.25rem;
    border-bottom: 2px solid var(--border); letter-spacing: 0.3px;
}
.section-title i { color: var(--accent); margin-right: 6px; }

/* ===== Buttons ===== */
.btn { font-weight: 500; font-size: 0.85rem; border-radius: 6px; padding: 0.45rem 1rem; min-height: 38px; display: inline-flex; align-items: center; gap: 5px; transition: all 0.15s; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn-dark { background: var(--text); border-color: var(--text); color: #fff; }
.btn-dark:hover { background: #333; border-color: #333; }
.btn-outline-light { border-color: var(--border-light); color: var(--text-dim); }
.btn-outline-light:hover { background: rgba(0,0,0,0.04); color: var(--text); }
.btn-outline-secondary { border-color: var(--border); color: var(--text-dim); }
.btn-outline-secondary:hover { background: var(--bg-input); color: var(--text); }
.btn-secondary { background: #e5e7eb; border-color: #e5e7eb; color: var(--text); }
.btn-secondary:hover { background: #d1d5db; }
.btn-sm { padding: 0.3rem 0.7rem; font-size: 0.8rem; min-height: 32px; }
.btn-danger { background: var(--red); border-color: var(--red); color: #fff; }
.btn-success { background: var(--green); border-color: var(--green); color: #fff; }
.btn-warning { background: var(--orange); border-color: var(--orange); color: #fff; }

/* ===== Forms ===== */
.form-control, .form-select {
    background: #fff; border: 1px solid var(--border);
    color: var(--text); border-radius: 6px; font-size: 0.85rem;
    padding: 0.5rem 0.75rem; min-height: 38px;
}
.form-control:focus, .form-select:focus {
    border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-dim);
    background: #fff; color: var(--text);
}
.form-control::placeholder { color: var(--text-muted); }
.form-label { color: var(--text-dim); font-size: 0.82rem; font-weight: 500; margin-bottom: 0.3rem; }
.form-check-label { color: var(--text-dim); font-size: 0.82rem; }
.form-check-input:checked { background-color: var(--accent); border-color: var(--accent); }
textarea.form-control { min-height: 100px; }

/* ===== Tables ===== */
.table { color: var(--text); font-size: 0.85rem; }
.table thead th {
    background: var(--bg-input); border-color: var(--border);
    color: var(--text-dim); font-weight: 600; font-size: 0.78rem;
    text-transform: uppercase; letter-spacing: 0.5px; padding: 0.6rem 0.75rem;
}
.table td { border-color: var(--border); padding: 0.6rem 0.75rem; vertical-align: middle; }
.table-hover tbody tr:hover { background: var(--bg-card-hover); }

/* ===== Badges ===== */
.badge { font-weight: 500; font-size: 0.7rem; padding: 0.25em 0.6em; border-radius: 4px; }
.badge.bg-success { background: #dcfce7 !important; color: #166534; }
.badge.bg-warning { background: #fef3c7 !important; color: #92400e; }
.badge.bg-danger { background: #fee2e2 !important; color: #991b1b; }
.badge.bg-info { background: #dbeafe !important; color: #1e40af; }
.badge.bg-secondary { background: #f3f4f6 !important; color: #4b5563; }
.badge.bg-primary { background: #fed7aa !important; color: #9a3412; }
.badge.bg-dark { background: #e5e7eb !important; color: #374151; }

/* ===== Alerts ===== */
.alert { background: var(--bg-card); border: 1px solid var(--border); border-radius: 6px; font-size: 0.85rem; box-shadow: var(--shadow); }
.alert-success { border-left: 3px solid var(--green); color: #166534; }
.alert-danger { border-left: 3px solid var(--red); color: #991b1b; }
.alert-warning { border-left: 3px solid var(--orange); color: #92400e; }
.alert-info { border-left: 3px solid var(--blue); color: #1e40af; }
.alert-secondary { border-left: 3px solid var(--text-muted); }
.alert .btn-close { filter: none; }

/* ===== Modal ===== */
.modal-content { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow-lg); }
.modal-header { border-bottom: 1px solid var(--border); color: var(--text); }
.modal-footer { border-top: 1px solid var(--border); }
.modal-header .btn-close { filter: none; }

/* ===== Nav Tabs ===== */
.nav-tabs { border-color: var(--border); }
.nav-tabs .nav-link {
    color: var(--text-dim); border: none; font-size: 0.85rem; padding: 0.5rem 1rem;
}
.nav-tabs .nav-link:hover { color: var(--text); border-bottom: 2px solid var(--border); }
.nav-tabs .nav-link.active {
    background: transparent; color: var(--accent); border: none;
    border-bottom: 2px solid var(--accent); font-weight: 500;
}

/* ===== Search Box ===== */
.search-box { background: var(--bg-card) !important; border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.search-box .input-group-text { background: var(--bg-input); border-color: var(--border); color: var(--text-dim); }
.input-group-text { background: var(--bg-input); border-color: var(--border); color: var(--text-dim); }

/* ===== Action Buttons (icon) ===== */
.action-btn {
    cursor: pointer; padding: 0.3rem 0.45rem; border-radius: 4px; transition: all 0.15s;
    display: inline-flex; align-items: center; min-height: 30px; color: var(--text-dim);
}
.action-btn:hover { background: var(--bg-input); color: var(--accent); }

/* ===== Empty State ===== */
.empty-state { text-align: center; padding: 3rem 1rem; color: var(--text-muted); }
.empty-state i { font-size: 3rem; margin-bottom: 0.75rem; opacity: 0.3; }

/* ===== Login Card ===== */
.login-card {
    background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px;
    box-shadow: 0 8px 40px rgba(0,0,0,0.1);
}
.login-card .brand { font-weight: 700; color: var(--accent); }
.login-card .subtitle { color: var(--text-dim); font-size: 0.8rem; }

/* ===== Mobile Bottom Nav ===== */
.mobile-bottom-nav {
    display: none;
    position: fixed; bottom: 0; left: 0; right: 0; z-index: 1030;
    background: var(--bg-card); border-top: 1px solid var(--border);
    padding: 0.35rem 0; padding-bottom: env(safe-area-inset-bottom, 0.35rem);
    box-shadow: 0 -1px 3px rgba(0,0,0,0.06);
}
.mobile-bottom-nav a {
    color: var(--text-dim); text-align: center; font-size: 0.65rem;
    padding: 0.2rem 0; text-decoration: none; flex: 1; display: flex;
    flex-direction: column; align-items: center; gap: 2px;
    transition: color 0.15s; min-height: unset;
}
.mobile-bottom-nav a i { font-size: 1.1rem; }
.mobile-bottom-nav a.active { color: var(--accent); }

/* ===== Responsive ===== */
@media (max-width: 991.98px) {
    .app-layout { flex-direction: column; }
    .app-sidebar { width: 100%; position: static; height: auto; padding: 0.4rem 0; border-right: none; border-bottom: 1px solid rgba(255,255,255,0.06); }
    .app-sidebar .sidebar-section { padding: 0.4rem 1rem 0.2rem; }
    .app-sidebar .nav-link { padding: 0.35rem 1rem; min-height: 34px; }
    .app-content { padding: 1rem; }
}
@media (max-width: 767.98px) {
    .mobile-bottom-nav { display: flex; }
    body { padding-bottom: 56px; }
    .app-content { padding: 0.75rem; }
    .table-responsive { -webkit-overflow-scrolling: touch; }
    .btn { padding: 0.4rem 0.8rem; }
    .form-control { font-size: 0.9rem; }
}

/* ===== Touch Optimization ===== */
.btn, .nav-link, .action-btn, .form-control, .form-select { min-height: 44px; }
.mobile-bottom-nav a, .navbar .nav-link { min-height: unset; }

/* ===== Misc ===== */
.text-muted { color: var(--text-dim) !important; }
hr { border-color: var(--border); }
pre { background: var(--bg-input); color: var(--text); border: 1px solid var(--border); border-radius: 6px; padding: 0.75rem; }
img.img-thumbnail { background: var(--bg-card); border-color: var(--border); }