:root {
  --bg: #f4f7fb;
  --surface: #ffffff;
  --surface-muted: #f8fafd;
  --text: #172433;
  --text-muted: #50657a;
  --line: #dce5ef;
  --line-strong: #c4d2e0;
  --accent: #0d63b8;
  --accent-strong: #0a4f92;
  --danger: #ad2e44;
  --success: #15653e;
  --radius: 12px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
}

.shell {
  width: min(1040px, 100% - 2rem);
  margin-inline: auto;
}

.app-header {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

.shell-header {
  padding: 1rem 0 0.9rem;
}

.brand-wrap {
  display: flex;
  align-items: center;
  gap: 0.9rem;
}

.brand-logo {
  width: 86px;
  height: auto;
}

.brand-title {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 700;
}

.brand-subtitle {
  margin: 0.2rem 0 0;
  color: var(--text-muted);
  font-size: 0.93rem;
}

.app-nav {
  margin-top: 0.95rem;
  display: flex;
  gap: 0.55rem;
  flex-wrap: wrap;
}

.nav-link {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 600;
  background: var(--surface-muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.45rem 0.85rem;
  transition: background-color 120ms ease, border-color 120ms ease, color 120ms ease;
}

.nav-link:hover {
  color: var(--accent-strong);
  border-color: var(--line-strong);
}

.nav-link[aria-current="page"] {
  color: var(--accent-strong);
  background: #e9f2fb;
  border-color: #bfd6ee;
}

.app-main {
  padding-top: 1.4rem;
  padding-bottom: 1.6rem;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.1rem;
}

.panel-spacious {
  padding: 1.3rem;
}

.panel-form {
  max-width: 760px;
}

.panel-centered {
  text-align: center;
}

.section-head {
  margin-bottom: 1rem;
}

.section-head h2 {
  margin: 0;
  font-size: 1.18rem;
}

.lead {
  margin: 0.38rem 0 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.85rem;
}

.card {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1rem;
  background: var(--surface-muted);
}

.card h3 {
  margin: 0;
  font-size: 1.02rem;
}

.card p {
  margin: 0.55rem 0 0.95rem;
  color: var(--text-muted);
  line-height: 1.45;
  font-size: 0.93rem;
}

.card-highlight {
  background: #eef5fc;
  border-color: #bfd6ee;
}

.card-btn {
  display: inline-block;
  text-decoration: none;
}

.stack-form {
  display: grid;
  gap: 0.95rem;
}

.stack-form label {
  display: grid;
  gap: 0.38rem;
}

.stack-form span {
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

input[type="text"] {
  width: 100%;
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  padding: 0.6rem 0.75rem;
  font-size: 0.96rem;
  color: var(--text);
  background: #fff;
}

input[type="text"]:focus {
  border-color: var(--accent);
  outline: 2px solid rgba(13, 99, 184, 0.18);
  outline-offset: 0;
}

.actions {
  display: flex;
  gap: 0.65rem;
  flex-wrap: wrap;
  padding-top: 0.1rem;
}

.btn {
  border: 1px solid transparent;
  border-radius: 9px;
  padding: 0.57rem 0.9rem;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  transition: background-color 120ms ease, border-color 120ms ease, color 120ms ease;
}

.btn-primary {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
}

.btn-primary:hover {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}

.btn-secondary {
  color: var(--text);
  background: #edf2f7;
  border-color: var(--line-strong);
}

.btn-secondary:hover {
  background: #e3eaf2;
}

.alert {
  border: 1px solid;
  border-radius: 10px;
  padding: 0.7rem 0.85rem;
  margin-bottom: 0.85rem;
  font-size: 0.9rem;
  font-weight: 600;
}

.alert-error {
  color: var(--danger);
  background: #fff0f3;
  border-color: #f3ccd5;
}

.alert-success {
  color: var(--success);
  background: #eefbf4;
  border-color: #c8e9d6;
}

.link-home {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

.debug {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.84rem;
  color: var(--text-muted);
}

.app-footer {
  color: var(--text-muted);
  font-size: 0.84rem;
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.app-footer .shell {
  padding: 0.9rem 0;
}

a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 2px solid rgba(13, 99, 184, 0.24);
  outline-offset: 1px;
}

@media (max-width: 700px) {
  .brand-wrap {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.55rem;
  }

  .brand-logo {
    width: 76px;
  }

  .shell {
    width: min(1040px, 100% - 1.15rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}