:root {
    --bg: #0f1720;
    --panel: #16202b;
    --panel-2: #1c2836;
    --line: rgba(255,255,255,.08);
    --text: #edf3f7;
    --muted: #9fb0c0;
    --accent: #45c4b0;
    --accent-2: #f5b84c;
    --danger: #ef7070;
    --success: #68d391;
    --white: #ffffff;
    --shadow: 0 18px 50px rgba(0,0,0,.25);
    --radius: 14px;
    --font-sans: 'Inter', system-ui, sans-serif;
    --font-display: 'DM Serif Display', Georgia, serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body { font-family: var(--font-sans); background: radial-gradient(circle at top left, #182433 0%, #0f1720 55%, #0c1219 100%); color: var(--text); }
a { color: inherit; text-decoration: none; }
code { font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace; }

.login-page { display: grid; place-items: center; min-height: 100vh; padding: 24px; }
.login-shell { width: 100%; max-width: 480px; }
.login-card, .panel, .card { background: rgba(22,32,43,.94); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.login-card { padding: 32px; }
.brand-lockup, .sidebar-brand { display: flex; gap: 14px; align-items: center; }
.brand-mark { width: 48px; height: 48px; border-radius: 12px; display: grid; place-items: center; background: linear-gradient(135deg, var(--accent), #7ce0cf); color: #05201d; font-weight: 800; }
.brand-name { font-weight: 700; }
.brand-sub, .lead, .topbar p, .panel-head p, .login-note { color: var(--muted); }
.login-card h1, .topbar h1, .panel-head h2, .editor-head h1 { font-family: var(--font-display); font-weight: 400; margin: 22px 0 8px; letter-spacing: 0; }
.stack { display: grid; gap: 14px; }
label { display: grid; gap: 8px; font-size: 14px; color: var(--muted); }
input, select, textarea {
    width: 100%; border: 1px solid var(--line); background: var(--panel-2); color: var(--text);
    border-radius: 12px; padding: 12px 14px; font: inherit;
}
textarea { resize: vertical; min-height: 120px; }
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    border: 1px solid transparent; border-radius: 12px; padding: 12px 16px; font-weight: 700;
    cursor: pointer; transition: .15s ease; width: fit-content;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: linear-gradient(135deg, var(--accent), #76dccb); color: #06231f; }
.btn-secondary { background: var(--panel-2); border-color: var(--line); color: var(--text); }
.alert { padding: 14px 16px; border-radius: 12px; margin: 14px 0; }
.alert-error { background: rgba(239,112,112,.14); border: 1px solid rgba(239,112,112,.3); color: #ffd0d0; }
.alert-success { background: rgba(104,211,145,.12); border: 1px solid rgba(104,211,145,.25); color: #d4ffe4; }
.login-note { margin-top: 18px; font-size: 12px; }

.app-shell { display: grid; grid-template-columns: 280px 1fr; min-height: 100vh; }
.sidebar { padding: 28px; border-right: 1px solid var(--line); background: rgba(12,18,25,.84); position: sticky; top: 0; height: 100vh; }
.side-nav { display: grid; gap: 8px; margin-top: 28px; }
.side-nav a { padding: 12px 14px; border-radius: 12px; color: var(--muted); }
.side-nav a.active, .side-nav a:hover { background: rgba(255,255,255,.05); color: var(--text); }
.content { padding: 28px; }
.topbar, .editor-head { display: flex; justify-content: space-between; gap: 24px; align-items: flex-start; margin-bottom: 22px; }
.topbar-badge { padding: 10px 14px; border-radius: 999px; background: rgba(69,196,176,.12); border: 1px solid rgba(69,196,176,.22); color: #b8fff3; font-weight: 700; }
.cards, .columns { display: grid; gap: 18px; }
.cards { grid-template-columns: repeat(3, minmax(0,1fr)); margin-bottom: 18px; }
.columns { grid-template-columns: repeat(2, minmax(0,1fr)); margin-bottom: 18px; }
.card, .panel { padding: 18px; }
.stat-card span { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .12em; }
.stat-card strong { display: block; margin-top: 10px; font-size: 32px; font-weight: 700; }
.panel-head { margin-bottom: 16px; }
.grid-form { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 14px; }
.wide { grid-column: 1 / -1; }
.table-wrap { overflow: auto; }
.table { width: 100%; border-collapse: collapse; font-size: 14px; }
.table th, .table td { padding: 12px 10px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.pill { display: inline-flex; padding: 6px 10px; border-radius: 999px; background: rgba(255,255,255,.06); }
.file-tree { display: grid; gap: 8px; max-height: 520px; overflow: auto; }
.tree-row { padding: 4px 0; color: var(--muted); }
.mini-item { display: grid; gap: 2px; padding: 12px 14px; background: rgba(255,255,255,.03); border: 1px solid var(--line); border-radius: 12px; }
.mini-item strong { color: var(--text); }
.editor-page { padding: 22px; }
.editor-form textarea { width: 100%; min-height: 70vh; font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace; font-size: 14px; line-height: 1.6; }
.editor-actions { display: flex; gap: 10px; flex-wrap: wrap; }

@media (max-width: 1100px) {
    .app-shell { grid-template-columns: 1fr; }
    .sidebar { position: static; height: auto; }
    .cards, .columns, .grid-form { grid-template-columns: 1fr; }
    .wide { grid-column: auto; }
}