:root {
    --bg: #f3f6fb;
    --surface: #ffffff;
    --surface-2: #f8fafc;
    --border: #dfe7f1;
    --text: #182230;
    --muted: #65758b;
    --primary: #1769e0;
    --primary-dark: #0f54ba;
    --primary-soft: #eaf2ff;
    --success: #14804a;
    --warning: #a15c00;
    --danger: #c63434;
    --shadow: 0 14px 38px rgba(31, 54, 83, .08);
    --radius: 14px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    background: var(--bg);
    color: var(--text);
    font: 14px/1.5 Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button, input, textarea, select { font: inherit; }
button { cursor: pointer; }

.loading-screen,
.login-page {
    min-height: 100vh;
    display: grid;
    place-items: center;
    align-content: center;
    gap: 14px;
}

.loading-screen p { color: var(--muted); margin: 0; }

.brand-mark {
    width: 48px;
    height: 48px;
    border-radius: 14px;
    display: grid;
    place-items: center;
    color: #fff;
    font-size: 22px;
    font-weight: 800;
    background: linear-gradient(145deg, #2680ff, #1157c3);
    box-shadow: 0 12px 26px rgba(23, 105, 224, .25);
}

.login-card {
    width: min(430px, calc(100vw - 32px));
    padding: 32px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 20px;
    box-shadow: var(--shadow);
}

.login-brand { display: flex; gap: 14px; align-items: center; margin-bottom: 28px; }
.login-brand h1 { font-size: 18px; line-height: 1.25; margin: 0; }
.login-brand p { color: var(--muted); margin: 4px 0 0; }

.app-shell {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 248px minmax(0, 1fr);
}

.sidebar {
    position: sticky;
    top: 0;
    height: 100vh;
    padding: 22px 16px;
    background: #10213b;
    color: #d9e6f7;
    display: flex;
    flex-direction: column;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 11px;
    padding: 0 8px 22px;
}

.sidebar-brand .brand-mark { width: 40px; height: 40px; border-radius: 12px; }
.sidebar-brand strong { display: block; color: #fff; font-size: 14px; }
.sidebar-brand span { color: #91a6c2; font-size: 12px; }

.nav { display: grid; gap: 6px; }

.nav button {
    border: 0;
    border-radius: 10px;
    color: #bbcae0;
    background: transparent;
    padding: 11px 12px;
    text-align: left;
}

.nav button:hover,
.nav button.active { color: #fff; background: rgba(255,255,255,.1); }
.sidebar-footer { margin-top: auto; border-top: 1px solid rgba(255,255,255,.09); padding: 16px 8px 0; }
.sidebar-footer small { color: #91a6c2; display: block; margin-bottom: 10px; }
.sidebar-footer button { color: #c8d6e9; border: 0; background: none; padding: 0; }

.main { min-width: 0; }
.topbar {
    height: 72px;
    padding: 0 32px;
    background: rgba(255,255,255,.92);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 5;
    backdrop-filter: blur(10px);
}

.topbar h2 { margin: 0; font-size: 19px; }
.topbar p { margin: 2px 0 0; color: var(--muted); font-size: 12px; }
.content { padding: 28px 32px 48px; max-width: 1440px; margin: 0 auto; }

.grid { display: grid; gap: 18px; }
.stats { grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); }
.stat-card, .card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: 0 8px 24px rgba(36, 55, 77, .04);
}
.stat-card { padding: 20px; }
.stat-card span { color: var(--muted); display: block; margin-bottom: 8px; }
.stat-card strong { font-size: 28px; line-height: 1; }
.card { padding: 22px; }
.card + .card { margin-top: 18px; }
.card-header { display: flex; align-items: start; justify-content: space-between; gap: 18px; margin-bottom: 20px; }
.card-header h3 { margin: 0; font-size: 16px; }
.card-header p { margin: 4px 0 0; color: var(--muted); }

.button {
    border: 1px solid transparent;
    border-radius: 9px;
    padding: 9px 14px;
    font-weight: 650;
    color: #fff;
    background: var(--primary);
    display: inline-flex;
    gap: 7px;
    align-items: center;
    justify-content: center;
}
.button:hover { background: var(--primary-dark); }
.button.secondary { color: var(--text); background: #fff; border-color: var(--border); }
.button.secondary:hover { background: var(--surface-2); }
.button.danger { color: var(--danger); }
.button.small { padding: 6px 10px; font-size: 12px; }
.button:disabled { opacity: .55; cursor: not-allowed; }

.field { display: grid; gap: 6px; }
.field label { font-weight: 650; color: #344258; }
.field small { color: var(--muted); }
.field input, .field textarea, .field select {
    width: 100%;
    border: 1px solid #cfdae7;
    border-radius: 9px;
    background: #fff;
    color: var(--text);
    padding: 10px 11px;
    outline: none;
}
.field input:focus, .field textarea:focus, .field select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(23,105,224,.1);
}
.field textarea { min-height: 120px; resize: vertical; }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.form-grid .wide { grid-column: 1 / -1; }
.form-actions { display: flex; gap: 10px; justify-content: flex-end; padding-top: 18px; }

.toggle-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 13px 14px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--surface-2);
}
.toggle-row strong { display: block; }
.toggle-row small { color: var(--muted); }
.toggle { width: 42px; height: 24px; accent-color: var(--primary); }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 12px 10px; border-bottom: 1px solid var(--border); text-align: left; }
th { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .03em; }
tbody tr:hover { background: #fafcff; }

.badge {
    display: inline-flex;
    padding: 4px 8px;
    border-radius: 999px;
    font-size: 11px;
    font-weight: 700;
    background: #edf2f7;
    color: #55657b;
}
.badge.success { background: #e6f7ee; color: var(--success); }
.badge.warning { background: #fff3df; color: var(--warning); }
.badge.danger { background: #fdeaea; color: var(--danger); }
.badge.blue { background: var(--primary-soft); color: var(--primary); }

.tabs {
    display: flex;
    gap: 4px;
    overflow-x: auto;
    padding: 4px;
    border: 1px solid var(--border);
    border-radius: 11px;
    background: #eef3f8;
    margin-bottom: 18px;
}
.tabs button {
    white-space: nowrap;
    border: 0;
    border-radius: 8px;
    padding: 9px 12px;
    color: var(--muted);
    background: transparent;
}
.tabs button.active { color: var(--primary); background: #fff; box-shadow: 0 2px 8px rgba(36,55,77,.06); }

.template-card {
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px;
    background: #fff;
}
.template-card h4 { margin: 0 0 10px; }
.template-card textarea { min-height: 145px; }
.template-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }

.variables {
    display: flex;
    flex-wrap: wrap;
    gap: 7px;
    margin: 10px 0 0;
}
.variable {
    border: 1px solid #bdd2f4;
    background: var(--primary-soft);
    color: var(--primary-dark);
    border-radius: 999px;
    padding: 5px 9px;
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 11px;
}

.option-row {
    display: grid;
    grid-template-columns: 52px 1fr 90px;
    align-items: center;
    gap: 12px;
    padding: 13px 0;
    border-bottom: 1px solid var(--border);
}
.support-row { grid-template-columns: 52px minmax(150px, .8fr) minmax(200px, 1fr) minmax(190px, .9fr) 80px; }
.option-row input[type="text"], .option-row input[type="number"] {
    width: 100%;
    border: 1px solid #cfdae7;
    border-radius: 8px;
    padding: 8px 10px;
}

.code-box {
    display: flex;
    gap: 8px;
    align-items: center;
    padding: 11px 12px;
    background: #0f1d31;
    border-radius: 9px;
    color: #dbe8f8;
    font: 12px/1.5 ui-monospace, SFMono-Regular, Menlo, monospace;
    overflow-wrap: anywhere;
}
.code-box span { flex: 1; }

.simulator { display: grid; grid-template-columns: minmax(0, 1fr) minmax(300px, .8fr); gap: 18px; }
.chat {
    min-height: 420px;
    max-height: 540px;
    overflow-y: auto;
    background: #e9eef5;
    border-radius: 12px;
    padding: 18px;
}
.bubble {
    width: fit-content;
    max-width: 86%;
    padding: 10px 12px;
    margin-bottom: 10px;
    border-radius: 12px 12px 12px 3px;
    white-space: pre-wrap;
    background: #fff;
    box-shadow: 0 2px 7px rgba(24,34,48,.06);
}
.bubble.user { margin-left: auto; border-radius: 12px 12px 3px 12px; background: #d9ebff; }
.chat-compose { display: flex; gap: 8px; margin-top: 10px; }
.chat-compose input { flex: 1; border: 1px solid #cfdae7; border-radius: 9px; padding: 10px; }

.empty { padding: 38px 20px; text-align: center; color: var(--muted); }
.hint { padding: 12px 14px; border-radius: 10px; color: #41536a; background: #edf4ff; border: 1px solid #d6e6ff; }
.warning-box { background: #fff7e9; border-color: #f5dfb5; color: #75501c; }
.danger-text { color: var(--danger); }
.muted { color: var(--muted); }
.divider { height: 1px; background: var(--border); margin: 20px 0; }

.toast {
    position: fixed;
    right: 22px;
    bottom: 22px;
    z-index: 50;
    max-width: min(420px, calc(100vw - 44px));
    padding: 12px 16px;
    border-radius: 10px;
    color: #fff;
    background: #16283f;
    box-shadow: var(--shadow);
}
.toast.error { background: var(--danger); }

@media (max-width: 1050px) {
    .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .template-grid, .simulator { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
    .app-shell { grid-template-columns: 1fr; }
    .sidebar { position: static; height: auto; }
    .sidebar .nav { grid-template-columns: repeat(3, 1fr); }
    .sidebar-footer { display: none; }
    .topbar { padding: 0 18px; }
    .content { padding: 20px 16px 38px; }
    .form-grid, .stats { grid-template-columns: 1fr; }
    .option-row, .support-row { grid-template-columns: 44px 1fr; }
    .option-row > :nth-child(n+3), .support-row > :nth-child(n+3) { grid-column: 2; }
}