:root {
  --bg: #f5f7f8;
  --panel: #ffffff;
  --ink: #18212a;
  --muted: #62707f;
  --line: #d9e0e6;
  --blue: #2563eb;
  --blue-dark: #1e40af;
  --green: #0f8f62;
  --amber: #b7791f;
  --red: #b42318;
  --shadow: 0 24px 70px rgba(24, 33, 42, 0.11);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    linear-gradient(135deg, rgba(37, 99, 235, 0.08), transparent 34%),
    linear-gradient(315deg, rgba(15, 143, 98, 0.1), transparent 28%),
    var(--bg);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input {
  font: inherit;
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(280px, 0.92fr) minmax(340px, 1.08fr);
  gap: 28px;
  width: min(1120px, calc(100% - 32px));
  min-height: 100vh;
  margin: 0 auto;
  padding: 48px 0;
  align-items: center;
}

.intro-panel,
.auth-panel {
  min-width: 0;
}

.intro-panel h1 {
  margin: 10px 0 18px;
  font-size: clamp(2.35rem, 5vw, 4.8rem);
  line-height: 0.95;
  letter-spacing: 0;
}

.intro-copy {
  max-width: 620px;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.7;
}

.eyebrow {
  margin: 0;
  color: var(--blue-dark);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.status-card,
.session-card,
.form-card,
.relink-card,
.message {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: var(--shadow);
}

.status-card {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  margin: 28px 0;
  padding: 18px;
}

.status-card strong {
  display: block;
  margin-bottom: 4px;
}

.status-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}

.status-dot {
  width: 12px;
  height: 12px;
  margin-top: 5px;
  border-radius: 50%;
  flex: 0 0 auto;
}

.status-dot.is-ok {
  background: var(--green);
}

.status-dot.is-warn {
  background: var(--amber);
}

.acceptance-list {
  display: grid;
  gap: 10px;
  padding: 0;
  margin: 0;
  list-style: none;
  color: var(--muted);
}

.acceptance-list li {
  position: relative;
  padding-left: 22px;
  line-height: 1.55;
}

.acceptance-list li::before {
  position: absolute;
  top: 0.62em;
  left: 0;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  content: "";
}

.auth-panel {
  display: grid;
  gap: 16px;
}

.session-card {
  display: none;
  padding: 20px;
}

.session-card.is-visible {
  display: grid;
  gap: 16px;
}

.session-card h2,
.form-card h2,
.relink-card h2 {
  margin: 4px 0 0;
  font-size: 1.35rem;
}

.session-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
}

.session-grid div {
  min-width: 0;
  padding: 12px;
  border-radius: 8px;
  background: #f7fafc;
}

.session-grid dt {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
}

.session-grid dd {
  overflow-wrap: anywhere;
  margin: 4px 0 0;
  font-weight: 750;
}

.tabs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  padding: 6px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
}

.tab {
  min-height: 44px;
  border: 0;
  border-radius: 6px;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
  font-weight: 800;
}

.tab.is-active {
  color: #ffffff;
  background: var(--ink);
}

.form-card {
  display: none;
  padding: 24px;
}

.form-card.is-active {
  display: grid;
  gap: 16px;
}

.form-card label {
  display: grid;
  gap: 7px;
}

.form-card span {
  font-weight: 750;
}

.form-card small {
  color: var(--muted);
  font-weight: 600;
}

.form-card input {
  width: 100%;
  min-height: 46px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 13px;
  color: var(--ink);
  background: #ffffff;
  outline: none;
}

.form-card input:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.14);
}

.check-row {
  grid-template-columns: 18px 1fr;
  align-items: center;
}

.check-row input {
  min-height: auto;
  width: 18px;
  height: 18px;
}

.primary-button,
.secondary-button,
.ghost-button {
  min-height: 46px;
  border-radius: 8px;
  border: 0;
  padding: 0 18px;
  cursor: pointer;
  font-weight: 850;
}

.primary-button {
  color: #ffffff;
  background: var(--blue);
}

.primary-button:hover {
  background: var(--blue-dark);
}

.secondary-button {
  color: #ffffff;
  background: var(--green);
}

.ghost-button {
  border: 1px solid var(--line);
  color: var(--ink);
  background: #ffffff;
}

.primary-button:disabled,
.secondary-button:disabled,
.ghost-button:disabled {
  cursor: wait;
  opacity: 0.68;
}

.relink-card {
  padding: 20px;
}

.relink-card p {
  margin: 8px 0 16px;
  color: var(--muted);
  line-height: 1.55;
}

.message {
  padding: 14px 16px;
  color: var(--ink);
  line-height: 1.55;
}

.message.is-error {
  border-color: rgba(180, 35, 24, 0.28);
  color: var(--red);
  background: #fff7f6;
}

.message.is-success {
  border-color: rgba(15, 143, 98, 0.28);
  color: #075f43;
  background: #f0fff8;
}

@media (max-width: 840px) {
  .app-shell {
    grid-template-columns: 1fr;
    align-items: start;
    padding: 28px 0;
  }

  .intro-panel h1 {
    font-size: 3rem;
  }
}

@media (max-width: 520px) {
  .app-shell {
    width: min(100% - 20px, 1120px);
  }

  .session-grid {
    grid-template-columns: 1fr;
  }

  .form-card,
  .session-card,
  .relink-card {
    padding: 18px;
  }
}