:root {
    --bg: #020617;
    --bg-elevated: #0b1020;
    --accent: #2563eb;
    --accent2: #1d4ed8;
    --text: #e5e7eb;
    --text-muted: #9ca3af;
    --danger: #ef4444;
    --warning: #f59e0b;
    --border: #1f2937;
    --radius-lg: 16px;
    --radius-md: 10px;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

body.dark-body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text", sans-serif;
    background: radial-gradient(circle at top, #1e293b 0, #020617 40%, #000 100%);
    color: var(--text);
    min-height: 100vh;
}

.hidden { display: none; }

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

.layout {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.main-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 24px;
    border-bottom: 1px solid rgba(148,163,184,0.2);
    background: radial-gradient(circle at top left, rgba(37,99,235,0.25), transparent 55%), rgba(15,23,42,0.94);
    position: sticky;
    top: 0;
    z-index: 50;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 10px;
}
.logo-img {
    height: 40px;
    width: auto;
    border-radius: 999px;
}
.logo-placeholder {
    padding: 6px 14px;
    border-radius: 999px;
    background: linear-gradient(135deg, #1e3a8a, #3b82f6);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 12px;
}
.top-right {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 13px;
}
.user-name {
    padding: 4px 10px;
    border-radius: 999px;
    border: 1px solid rgba(148,163,184,0.4);
}

.main-nav {
    display: flex;
    gap: 8px;
    padding: 8px 20px;
    border-bottom: 1px solid rgba(15,23,42,0.9);
    background: linear-gradient(to right, rgba(15,23,42,0.92), rgba(15,23,42,0.96));
    position: sticky;
    top: 56px;
    z-index: 40;
}

.nav-link {
    padding: 6px 12px;
    border-radius: 999px;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    border: 1px solid transparent;
}
.nav-link:hover {
    color: var(--text);
    border-color: rgba(37,99,235,0.8);
    text-decoration: none;
}

.main-content {
    flex: 1;
    width: 100%;
    margin: 0 auto;
    padding: 20px 20px 40px;
}

/* Cards */
.card {
    background: radial-gradient(circle at top, rgba(37,99,235,0.12), transparent 60%), var(--bg-elevated);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(15,23,42,0.9);
    padding: 16px 18px;
    margin-bottom: 16px;
}
.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}
.card-title {
    font-size: 16px;
    font-weight: 600;
}
.card-subtitle {
    font-size: 13px;
    color: var(--text-muted);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 6px 12px;
    border-radius: 999px;
    font-size: 13px;
    border: 1px solid transparent;
    cursor: pointer;
    background: transparent;
    color: var(--text);
}
.btn-primary {
    background: linear-gradient(135deg, #1e3a8a, #3b82f6);
    border-color: rgba(59,130,246,0.9);
}
.btn-ghost {
    border-color: rgba(148,163,184,0.4);
    background: rgba(15,23,42,0.9);
    color: var(--text-muted);
}
.btn-primary:hover,
.btn-ghost:hover {
    filter: brightness(1.05);
}

/* Forms */
.form {
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.form-inline {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: flex-end;
}
.form-label {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 2px;
}
.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 6px 9px;
    border-radius: var(--radius-md);
    border: 1px solid rgba(31,41,55,0.9);
    background: #020617;
    color: var(--text);
    font-size: 13px;
}
.form-textarea {
    min-height: 120px;
}

.checkbox-row {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-muted);
}

.alert {
    padding: 8px 10px;
    border-radius: var(--radius-md);
    font-size: 13px;
    margin-bottom: 8px;
}
.alert-success {
    background: rgba(34,197,94,0.1);
    border: 1px solid rgba(34,197,94,0.7);
}
.alert-error {
    background: rgba(239,68,68,0.1);
    border: 1px solid rgba(239,68,68,0.7);
}

/* Tables */
.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}
.table th,
.table td {
    padding: 7px 9px;
    border-bottom: 1px solid rgba(31,41,55,0.9);
}
.table th {
    text-align: left;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
}

/* Footer */
.main-footer {
    display: flex;
    justify-content: space-between;
    padding: 10px 20px 16px;
    font-size: 12px;
    border-top: 1px solid rgba(15,23,42,0.9);
    background: #020617;
    color: var(--text-muted);
}

/* Grid */
.grid {
    display: grid;
    gap: 12px;
}
.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

/* KB */
.kb-tree {
    font-size: 14px;
}
.kb-node {
    margin-left: 12px;
}
.kb-title {
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 2px 6px;
    border-radius: 999px;
}
.kb-title:hover {
    background: rgba(15,23,42,0.9);
}

/* Modal */
.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(15,23,42,0.78);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
}
.modal {
    background: radial-gradient(circle at top, rgba(37,99,235,0.18), transparent 60%), #020617;
    border-radius: 18px;
    border: 1px solid rgba(37,99,235,0.8);
    padding: 16px 18px;
    width: 100%;
    max-width: 420px;
}
.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 6px;
}
.modal-title {
    font-size: 15px;
    font-weight: 600;
}

/* Editor Toolbar */
.editor-wrapper {
    display: flex;
    flex-direction: column;
    gap: 4px;
}
.editor-toolbar {
    display: inline-flex;
    flex-wrap: wrap;
    gap: 4px;
    margin-bottom: 2px;
}
.editor-btn {
    border-radius: 999px;
    border: 1px solid rgba(148,163,184,0.5);
    background: rgba(15,23,42,0.9);
    color: var(--text-muted);
    font-size: 11px;
    padding: 2px 8px;
    cursor: pointer;
}
.editor-btn:hover {
    color: var(--text);
    border-color: rgba(59,130,246,0.9);
}