:root {
  --ink: #132033;
  --muted: #6a7890;
  --canvas: #edf2f6;
  --surface: #ffffff;
  --line: #d9e2ec;
  --blue: #1759ce;
  --blue-soft: #e9f0ff;
  --teal: #0b8c75;
  --red: #c74343;
  --shadow: 0 18px 44px rgba(26, 43, 68, 0.11);
}

* { box-sizing: border-box; }

body {
  min-height: 100vh;
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: "Avenir Next", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

button, input, select { font: inherit; }

.shell { width: min(100% - 40px, 980px); margin: 0 auto; padding: 10vh 0 72px; }

.login-view { width: min(100%, 410px); margin: 0 auto; }

.brand-mark {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border-radius: 9px;
  background: var(--blue);
  color: #fff;
  font-weight: 850;
}

.eyebrow { margin: 22px 0 7px; color: var(--teal); font-size: 12px; font-weight: 800; letter-spacing: 0.08em; }

h1 { margin: 0; font-size: 30px; line-height: 1.2; letter-spacing: 0; }

.login-form, .workspace {
  margin-top: 28px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

label { display: grid; gap: 8px; color: #425169; font-size: 13px; font-weight: 750; }

input, select {
  width: 100%;
  min-height: 42px;
  border: 1px solid #cbd7e5;
  border-radius: 7px;
  background: #fbfdff;
  color: var(--ink);
  padding: 0 12px;
  outline: none;
}

input:focus, select:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(23, 89, 206, 0.13); }

button {
  min-height: 42px;
  border: 0;
  border-radius: 7px;
  background: var(--blue);
  color: #fff;
  font-weight: 800;
  cursor: pointer;
}

button:hover { background: #104cad; }
button:disabled { opacity: 0.6; cursor: wait; }

.login-form button { width: 100%; margin-top: 16px; }
.form-error { min-height: 18px; margin: 12px 0 0; color: var(--red); font-size: 13px; }

.topbar { display: flex; align-items: center; justify-content: space-between; min-height: 62px; }
.brand-lockup { display: flex; align-items: center; gap: 12px; }
.brand-lockup strong, .brand-lockup span { display: block; }
.brand-lockup span { margin-top: 3px; color: var(--muted); font-size: 12px; }
.icon-button { width: 38px; min-height: 38px; background: #e2e9f2; color: var(--ink); font-size: 20px; }
.icon-button:hover { background: #ced9e8; }

.workspace { margin-top: 34px; }
.section-heading .eyebrow { margin-top: 0; }
.section-heading h1 { font-size: 24px; }

.signal-form { display: grid; grid-template-columns: 1.1fr 1fr 0.8fr auto; gap: 14px; align-items: end; margin-top: 26px; }
.signal-form button { padding: 0 24px; }

.result { display: flex; align-items: center; gap: 18px; min-height: 92px; margin-top: 26px; padding: 18px; border-top: 1px solid var(--line); }
.result-label { color: var(--muted); font-size: 13px; font-weight: 750; }
.numbers { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; min-height: 34px; color: var(--muted); font-size: 15px; }
.number-chip { display: inline-grid; width: 34px; height: 34px; place-items: center; border-radius: 7px; background: var(--blue-soft); color: var(--blue); font-weight: 850; }

@media (max-width: 720px) {
  .shell { width: min(100% - 28px, 980px); padding-top: 44px; }
  .signal-form { grid-template-columns: 1fr; }
  .signal-form button { width: 100%; }
}