:root {
    --ink: #17211d;
    --muted: #6c7771;
    --line: #e2e8e4;
    --canvas: #f4f7f5;
    --panel: #ffffff;
    --green: #0d7a55;
    --green-dark: #07583d;
    --green-soft: #e6f5ee;
    --gold: #d8a23e;
    --danger: #b83b3b;
    --shadow: 0 18px 55px rgba(19, 55, 41, .08);
}

* { box-sizing: border-box; }
html { min-height: 100%; background: var(--canvas); }
body { margin: 0; color: var(--ink); background: var(--canvas); font: 15px/1.5 Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
a { color: var(--green); text-decoration: none; }
button, input, select { font: inherit; }
button, .button { cursor: pointer; }

.app-shell { min-height: 100vh; display: grid; grid-template-columns: 250px minmax(0, 1fr); }
.sidebar { position: sticky; top: 0; height: 100vh; display: flex; flex-direction: column; padding: 28px 18px 20px; color: #f5fff9; background: linear-gradient(180deg, #0b3528 0%, #08291f 100%); }
.brand, .auth-brand { display: flex; align-items: center; gap: 12px; }
.brand { padding: 0 10px 28px; }
.brand-mark { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 14px; color: #fff; background: linear-gradient(135deg, #19a771, #0d7652); font-weight: 800; box-shadow: inset 0 0 0 1px rgba(255,255,255,.18); }
.brand strong, .auth-brand strong { display: block; font-size: 17px; letter-spacing: .01em; }
.brand small, .auth-brand small { display: block; color: #a9c7ba; }
.sidebar nav { display: grid; gap: 6px; }
.sidebar nav a { display: flex; align-items: center; gap: 12px; padding: 11px 12px; border-radius: 10px; color: #cce0d7; font-weight: 650; }
.sidebar nav a span { width: 22px; color: #8ebcac; font-size: 18px; text-align: center; }
.sidebar nav a:hover, .sidebar nav a.active { color: #fff; background: rgba(255,255,255,.1); }
.sidebar nav a.active span { color: #62dab0; }
.sidebar-footer { margin-top: auto; padding: 18px 10px 0; border-top: 1px solid rgba(255,255,255,.12); }
.sidebar-footer span, .sidebar-footer small { display: block; }
.sidebar-footer small { color: #9fbcaf; }
.logout-form { margin-top: 12px; }
.logout-form button { padding: 0; color: #71dfb7; border: 0; background: transparent; font-weight: 700; cursor: pointer; }

.workspace { min-width: 0; }
.topbar { height: 78px; display: flex; align-items: center; gap: 16px; padding: 0 34px; background: rgba(255,255,255,.88); border-bottom: 1px solid var(--line); backdrop-filter: blur(14px); }
.topbar p { margin: 0; color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .09em; }
.topbar strong { font-size: 16px; }
.status-dot { margin-left: auto; display: inline-flex; align-items: center; gap: 8px; color: var(--green-dark); font-size: 13px; font-weight: 700; }
.status-dot::before { content: ""; width: 8px; height: 8px; border-radius: 99px; background: #22aa75; box-shadow: 0 0 0 5px var(--green-soft); }
.menu-toggle { display: none; border: 0; background: transparent; font-size: 22px; }
.content { max-width: 1500px; margin: 0 auto; padding: 34px; }

.hero { display: flex; align-items: flex-end; justify-content: space-between; gap: 30px; padding: 32px; color: #fff; border-radius: 22px; background: radial-gradient(circle at 78% 20%, rgba(77,222,169,.24), transparent 30%), linear-gradient(135deg, #0c523a, #0a3025); box-shadow: var(--shadow); }
.hero h1 { max-width: 720px; margin: 8px 0 6px; font-size: clamp(26px, 3vw, 42px); line-height: 1.12; letter-spacing: -.035em; }
.hero p { margin: 0; color: #c8dfd5; }
.eyebrow { color: #72e1ba; font-size: 12px; font-weight: 800; letter-spacing: .14em; }
.metric-grid { display: grid; grid-template-columns: repeat(6, minmax(135px, 1fr)); gap: 14px; margin: 20px 0; }
.metric { padding: 21px; border: 1px solid var(--line); border-radius: 16px; background: var(--panel); box-shadow: 0 7px 30px rgba(19, 55, 41, .045); }
.metric span, .metric small { display: block; color: var(--muted); }
.metric strong { display: block; margin: 9px 0 3px; font-size: 29px; line-height: 1; }

.panel { overflow: hidden; margin-top: 20px; border: 1px solid var(--line); border-radius: 17px; background: var(--panel); box-shadow: 0 8px 35px rgba(19,55,41,.045); }
.panel-head, .page-heading { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.panel-head { padding: 22px 24px; border-bottom: 1px solid var(--line); }
.panel-head h2, .page-heading h1 { margin: 0; letter-spacing: -.02em; }
.panel-head h2 { font-size: 18px; }
.panel-head p, .page-heading p { margin: 4px 0 0; color: var(--muted); }
.page-heading { margin-bottom: 20px; }
.page-heading h1 { font-size: 30px; }
.table-panel { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 15px 18px; border-bottom: 1px solid #edf1ef; text-align: left; vertical-align: middle; white-space: nowrap; }
th { color: var(--muted); background: #fbfcfb; font-size: 11px; letter-spacing: .08em; text-transform: uppercase; }
tbody tr:hover { background: #fbfdfc; }
td strong, td small { display: block; }
td small { color: var(--muted); }
td code { color: #355149; font: 12px ui-monospace, SFMono-Regular, Consolas, monospace; }
.empty { padding: 44px; color: var(--muted); text-align: center; }
.badge { display: inline-flex; padding: 5px 9px; border-radius: 999px; color: var(--green-dark); background: var(--green-soft); font-size: 12px; font-weight: 750; }

.filters { display: flex; gap: 10px; margin-bottom: 14px; }
.filters .search { min-width: 280px; flex: 1; position: relative; }
.filters .search span { position: absolute; left: 13px; top: 9px; color: var(--muted); font-size: 20px; }
.filters input, .filters select, .stack input, .form-grid input, .form-grid select { width: 100%; min-height: 43px; padding: 9px 12px; color: var(--ink); border: 1px solid #ccd7d1; border-radius: 10px; background: #fff; outline: none; }
.filters .search input { padding-left: 40px; }
input:focus, select:focus { border-color: #35a57c !important; box-shadow: 0 0 0 3px rgba(29,152,108,.12); }
.primary, .secondary, .button { display: inline-flex; align-items: center; justify-content: center; min-height: 43px; padding: 9px 16px; border-radius: 10px; font-weight: 750; }
.primary { color: #fff; border: 1px solid var(--green); background: var(--green); }
.primary:hover { background: var(--green-dark); }
.secondary, .button.secondary { color: var(--ink); border: 1px solid #ccd7d1; background: #fff; }
.hero .secondary { color: #fff; border-color: rgba(255,255,255,.3); background: rgba(255,255,255,.1); }

.create-panel { padding: 0; }
.security-panel { max-width: 560px; padding: 24px; }
.create-panel summary { padding: 18px 22px; cursor: pointer; color: var(--green-dark); font-weight: 800; }
.form-grid { display: grid; grid-template-columns: repeat(4, minmax(160px, 1fr)) auto; align-items: end; gap: 12px; padding: 0 22px 22px; }
.user-admin-form { display: flex; align-items: center; gap: 7px; }
.user-admin-form select { min-height: 38px; padding: 7px 9px; border: 1px solid #ccd7d1; border-radius: 9px; background: #fff; }
.user-admin-form .secondary { min-height: 38px; padding: 7px 11px; }
.stack, .form-grid label { display: grid; gap: 7px; }
.stack label, .form-grid label { color: #3f4d47; font-size: 13px; font-weight: 700; }
.alert { margin-bottom: 18px; padding: 12px 14px; border-radius: 10px; }
.alert.success { color: #07583d; background: #e5f6ee; border: 1px solid #bee7d5; }
.alert.error { color: #922e2e; background: #ffeded; border: 1px solid #f3c6c6; }

.runtime-banner { display: flex; align-items: flex-start; justify-content: space-between; gap: 24px; margin-bottom: 20px; padding: 24px; color: #fff; border-radius: 18px; background: linear-gradient(135deg, #113f32, #0b2e25); box-shadow: var(--shadow); }
.runtime-banner h2 { margin: 5px 0 2px; font-size: 25px; }
.runtime-banner p { margin: 0; color: #bfd9ce; }
.runtime-banner details { width: min(560px, 100%); }
.runtime-banner summary { cursor: pointer; color: #7de1bd; font-weight: 800; text-align: right; }
.runtime-form { display: grid; grid-template-columns: 1fr 1.4fr; align-items: end; gap: 10px; margin-top: 14px; padding: 15px; color: var(--ink); border-radius: 12px; background: #fff; }
.runtime-form label, .editor-form label, .add-node label { display: grid; gap: 6px; color: #3f4d47; font-size: 12px; font-weight: 750; }
.runtime-form input, .runtime-form select, .runtime-form textarea, .editor-form input, .editor-form select, .editor-form textarea, .add-node input, .add-node select, .add-node textarea, .route-editor textarea { width: 100%; min-height: 42px; padding: 9px 11px; color: var(--ink); border: 1px solid #ccd7d1; border-radius: 9px; background: #fff; font: inherit; }
.flow-layout { display: grid; grid-template-columns: 270px minmax(0, 1fr); gap: 18px; align-items: start; }
.flow-versions { margin-top: 0; position: sticky; top: 98px; }
.version-list { display: grid; padding: 8px; }
.version-card { display: grid; gap: 4px; padding: 13px; border-radius: 10px; color: var(--ink); }
.version-card:hover, .version-card.active { background: var(--green-soft); }
.version-card span, .node-link span { color: var(--muted); font-size: 12px; }
.flow-main { min-width: 0; }
.flow-summary { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-top: 0; padding: 22px; }
.flow-summary h2 { margin: 9px 0 3px; }
.flow-summary p { margin: 0; color: var(--muted); }
.flow-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.editor-section { padding: 0; }
.editor-section summary { padding: 18px 22px; cursor: pointer; font-weight: 800; }
.editor-form { display: grid; gap: 13px; padding: 20px 22px; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.node-workspace { display: grid; grid-template-columns: 255px minmax(0, 1fr); gap: 18px; align-items: start; }
.node-list, .node-editor { margin-top: 20px; }
.node-link { display: grid; gap: 3px; padding: 12px 15px; color: var(--ink); border-bottom: 1px solid #edf1ef; }
.node-link:hover, .node-link.active { background: var(--green-soft); }
.add-node { margin: 12px; padding: 12px; border: 1px dashed #b8cac1; border-radius: 10px; }
.add-node summary { cursor: pointer; color: var(--green-dark); font-weight: 800; }
.add-node form { margin-top: 12px; }
.code-input { font: 12px/1.55 ui-monospace, SFMono-Regular, Consolas, monospace !important; }
.route-editor { padding: 0 22px 22px; border-top: 1px solid var(--line); }
.route-editor h3 { margin-bottom: 3px; }
.route-editor p { margin: 0 0 10px; color: var(--muted); }
.route-editor form { display: grid; gap: 10px; }
.danger-button { min-height: 38px; padding: 7px 11px; color: #9b2f2f; border: 1px solid #e8bebe; border-radius: 9px; background: #fff4f4; font-weight: 750; }
.alert ul { margin: 8px 0 0; padding-left: 20px; }

.auth-shell { min-height: 100vh; display: grid; place-items: center; padding: 24px; background: radial-gradient(circle at 15% 20%, rgba(25,167,113,.18), transparent 30%), linear-gradient(145deg, #edf5f1, #f8faf9); }
.auth-card { width: min(460px, 100%); padding: 34px; border: 1px solid #dce6e1; border-radius: 22px; background: rgba(255,255,255,.94); box-shadow: var(--shadow); }
.auth-brand { padding-bottom: 26px; border-bottom: 1px solid var(--line); }
.auth-brand small { color: var(--muted); }
.auth-card h1 { margin: 26px 0 5px; font-size: 30px; letter-spacing: -.03em; }
.auth-card > p { margin: 0 0 22px; color: var(--muted); }
.stack { gap: 15px; }
.auth-note { display: block; margin-top: 20px; color: var(--muted); text-align: center; }

@media (max-width: 1180px) {
    .metric-grid { grid-template-columns: repeat(3, 1fr); }
    .form-grid { grid-template-columns: repeat(2, 1fr); }
    .flow-layout { grid-template-columns: 220px minmax(0, 1fr); }
    .node-workspace { grid-template-columns: 210px minmax(0, 1fr); }
}

@media (max-width: 780px) {
    .app-shell { display: block; }
    .sidebar { position: fixed; z-index: 10; width: 260px; transform: translateX(-100%); transition: transform .2s ease; box-shadow: 20px 0 60px rgba(0,0,0,.2); }
    body.nav-open .sidebar { transform: translateX(0); }
    .menu-toggle { display: block; }
    .topbar { height: 70px; padding: 0 18px; }
    .status-dot { font-size: 0; }
    .content { padding: 22px 16px; }
    .hero { align-items: flex-start; flex-direction: column; padding: 24px; }
    .metric-grid { grid-template-columns: repeat(2, 1fr); }
    .filters { align-items: stretch; flex-direction: column; }
    .filters .search { min-width: 0; }
    .page-heading { align-items: flex-start; flex-direction: column; }
    .form-grid { grid-template-columns: 1fr; }
    .runtime-banner, .flow-summary { flex-direction: column; }
    .runtime-banner details { width: 100%; }
    .runtime-banner summary { text-align: left; }
    .runtime-form, .flow-layout, .node-workspace, .two-col { grid-template-columns: 1fr; }
    .flow-versions { position: static; }
}

@media (max-width: 460px) {
    .metric-grid { grid-template-columns: 1fr; }
    .auth-card { padding: 25px; }
}