@layer rtx-reset, rtx-base, rtx-components, rtx-utilities;

@layer rtx-reset {
  .rtx-app, .rtx-app *, .rtx-app *::before, .rtx-app *::after { box-sizing: border-box; }
  .rtx-app { margin: 0; }
  .rtx-app img { max-width: 100%; height: auto; }
  .rtx-app button, .rtx-app input, .rtx-app select, .rtx-app textarea { font: inherit; }
}

@layer rtx-base {
  .rtx-app {
    --rtx-color-bg: #f5f6f7;
    --rtx-color-surface: #ffffff;
    --rtx-color-surface-soft: #f8f9fa;
    --rtx-color-text: #24272a;
    --rtx-color-muted: #666c73;
    --rtx-color-line: #d8dde2;
    --rtx-color-line-strong: #b7bec6;
    --rtx-color-accent: #006ab5;
    --rtx-color-accent-hover: #005a99;
    --rtx-color-success: #087b35;
    --rtx-color-danger: #b42318;
    --rtx-color-button: #222222;
    --rtx-color-button-hover: #111111;
    --rtx-radius-sm: 8px;
    --rtx-radius-md: 12px;
    --rtx-radius-lg: 20px;
    --rtx-shadow-card: 0 18px 55px rgba(20, 24, 28, .10);
    --rtx-font: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
    color: var(--rtx-color-text);
    background: var(--rtx-color-bg);
    font-family: var(--rtx-font);
    font-size: 16px;
    line-height: 1.55;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
  }
  .rtx-app a { color: var(--rtx-color-accent); text-underline-offset: 3px; }
  .rtx-app :focus-visible { outline: 3px solid color-mix(in srgb, var(--rtx-color-accent) 28%, transparent); outline-offset: 2px; }
  .rtx-title { margin: 0; font-size: clamp(1.85rem, 3vw, 2.7rem); line-height: 1.08; letter-spacing: -.035em; font-weight: 700; }
  .rtx-heading { margin: 0; font-size: 1.25rem; line-height: 1.2; letter-spacing: -.018em; font-weight: 700; }
  .rtx-copy { margin: 0; color: var(--rtx-color-muted); }
}

@layer rtx-components {
  .rtx-shell { min-height: 100vh; min-height: 100svh; display: grid; grid-template-columns: minmax(0, 260px) minmax(0, 1fr); }
  .rtx-sidebar { background: #222; color: #fff; padding: 24px 18px; }
  .rtx-main { min-width: 0; padding: clamp(20px, 3vw, 40px); }
  .rtx-card { background: var(--rtx-color-surface); border: 1px solid var(--rtx-color-line); border-radius: var(--rtx-radius-lg); padding: clamp(20px, 3vw, 32px); box-shadow: var(--rtx-shadow-card); }
  .rtx-stack { display: grid; gap: 18px; }
  .rtx-cluster { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }
  .rtx-field { display: grid; gap: 8px; min-width: 0; }
  .rtx-label { font-size: .9rem; font-weight: 650; color: var(--rtx-color-text); }
  .rtx-input, .rtx-select, .rtx-textarea {
    width: 100%; min-width: 0; border: 1px solid var(--rtx-color-line); border-radius: var(--rtx-radius-md);
    background: var(--rtx-color-surface); color: var(--rtx-color-text); min-height: 48px; padding: 10px 13px;
    box-shadow: none; outline: none; transition: border-color .16s ease, box-shadow .16s ease, background .16s ease;
  }
  .rtx-textarea { min-height: 130px; resize: vertical; }
  .rtx-input:hover, .rtx-select:hover, .rtx-textarea:hover { border-color: var(--rtx-color-line-strong); }
  .rtx-input:focus, .rtx-select:focus, .rtx-textarea:focus { border-color: var(--rtx-color-accent); box-shadow: 0 0 0 4px color-mix(in srgb, var(--rtx-color-accent) 12%, transparent); }
  .rtx-button { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; padding: 10px 16px; border: 1px solid transparent; border-radius: 10px; font-weight: 700; text-decoration: none; cursor: pointer; transition: background .16s ease, border-color .16s ease, transform .16s ease; }
  .rtx-button--primary { background: var(--rtx-color-button); color: #fff; }
  .rtx-button--primary:hover { background: var(--rtx-color-button-hover); color: #fff; }
  .rtx-button--secondary { background: var(--rtx-color-surface); border-color: var(--rtx-color-line); color: var(--rtx-color-text); }
  .rtx-alert { border: 1px solid; border-radius: var(--rtx-radius-md); padding: 12px 14px; font-size: .92rem; }
  .rtx-alert--danger { color: #7a271a; background: #fef3f2; border-color: #fecdca; }
  .rtx-table-wrap { overflow-x: auto; border: 1px solid var(--rtx-color-line); border-radius: var(--rtx-radius-md); background: var(--rtx-color-surface); }
  .rtx-table { width: 100%; border-collapse: collapse; }
  .rtx-table th, .rtx-table td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--rtx-color-line); }
  .rtx-table th { font-size: .82rem; letter-spacing: .02em; color: var(--rtx-color-muted); background: var(--rtx-color-surface-soft); }
}

@layer rtx-utilities {
  .rtx-muted { color: var(--rtx-color-muted); }
  .rtx-sr-only { position: absolute !important; width: 1px !important; height: 1px !important; padding: 0 !important; margin: -1px !important; overflow: hidden !important; clip: rect(0,0,0,0) !important; white-space: nowrap !important; border: 0 !important; }
}

@media (max-width: 840px) {
  .rtx-shell { grid-template-columns: 1fr; }
  .rtx-sidebar { min-height: auto; }
}