/* Auth is a quiet extension of the budget ledger, not a separate product shell. */
#authRoot:not([hidden]) {
  display: grid;
  min-height: 100dvh;
  place-items: center;
  padding: clamp(1rem, 2.8vw, 3.5rem);
  background:
    radial-gradient(circle at 18% 78%, color-mix(in srgb, var(--income) 13%, transparent), transparent 22rem),
    radial-gradient(circle at 86% 10%, color-mix(in srgb, var(--accent) 16%, transparent), transparent 31rem),
    var(--ink);
  color: var(--paper);
}

.auth-skip-link {
  z-index: 30;
}

.auth-shell {
  display: grid;
  width: min(100%, 76rem);
  min-height: min(38rem, calc(100dvh - clamp(2rem, 5.6vw, 7rem)));
  height: min(46rem, calc(100dvh - clamp(2rem, 5.6vw, 7rem)));
  grid-template-columns: minmax(21rem, 0.62fr) minmax(0, 1fr);
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 1rem;
  box-shadow: var(--shadow);
}

.auth-ledger {
  position: relative;
  display: grid;
  min-height: 0;
  grid-template-rows: auto 1fr auto;
  overflow: hidden;
  border-right: 1px solid var(--line);
  padding: clamp(1.5rem, 3.4vw, 3rem);
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--accent) 8%, transparent), transparent 35%),
    color-mix(in srgb, var(--surface) 60%, var(--ink));
}

.auth-ledger::before,
.auth-ledger::after {
  position: absolute;
  pointer-events: none;
  content: "";
}

.auth-ledger::before {
  inset: 0;
  opacity: 0.34;
  background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 4rem 4rem;
  mask-image: linear-gradient(to bottom, black, transparent 74%);
}

.auth-ledger::after {
  right: 1.25rem;
  bottom: 1.25rem;
  left: 1.25rem;
  height: 0.5rem;
  background: repeating-linear-gradient(90deg, var(--accent) 0 0.55rem, transparent 0.55rem 1rem);
}

.auth-brand,
.auth-ledger-copy,
.auth-flow {
  position: relative;
  z-index: 1;
}

.auth-brand {
  display: inline-flex;
  width: max-content;
  align-items: center;
  gap: 0.65rem;
  color: var(--paper);
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  text-decoration: none;
}

.auth-brand-mark {
  display: grid;
  width: 2rem;
  height: 2rem;
  place-items: center;
  border-radius: 6px 12px 6px 12px;
  background: var(--accent);
  color: var(--ink);
  font-family: "DM Mono", monospace;
}

.auth-ledger-copy {
  max-width: 24rem;
  align-self: center;
  margin: 1.75rem 0;
}

.auth-kicker {
  margin: 0 0 0.8rem;
  color: var(--accent);
  font-family: "DM Mono", monospace;
  font-size: 0.67rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.auth-ledger-title {
  margin: 0;
  color: var(--paper);
  font-size: clamp(2.5rem, 4.1vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.09em;
  line-height: 0.86;
}

.auth-ledger-title + p {
  max-width: 22rem;
  margin: 1.35rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.65;
}

.auth-flow {
  display: grid;
  min-height: 8rem;
  grid-template-columns: auto 1fr;
  gap: 0.65rem 1rem;
  align-items: start;
  margin-top: 2rem;
}

.auth-flow-label {
  grid-column: 1 / -1;
  color: var(--muted);
  font-family: "DM Mono", monospace;
  font-size: 0.62rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.auth-flow-line {
  grid-column: 2;
  grid-row: 2 / span 3;
  width: 1px;
  height: 100%;
  margin-left: 0.35rem;
  background: linear-gradient(var(--income), var(--expense) 72%, var(--accent));
}

.auth-flow-point {
  position: relative;
  z-index: 1;
  grid-column: 2;
  width: 1.5rem;
  height: 1.5rem;
  margin-left: -0.4rem;
  place-self: start;
  border: 1px solid var(--surface-raised);
  border-radius: 50%;
  background: var(--surface);
  color: var(--paper);
  font-family: "DM Mono", monospace;
  font-size: 0.72rem;
  line-height: 1.35rem;
  text-align: center;
}

.auth-flow-point-income { color: var(--income); }
.auth-flow-point-expense { color: var(--expense); }
.auth-flow-point-signal { color: var(--accent); }

.auth-panel {
  display: grid;
  min-width: 0;
  place-items: center;
  padding: clamp(1.75rem, 4vw, 4.5rem);
}

.auth-card {
  width: min(100%, 27rem);
}

.auth-card h1 {
  max-width: 11ch;
  margin: 0;
  font-size: clamp(2rem, 3.2vw, 3.1rem);
  letter-spacing: -0.06em;
  line-height: 1.02;
}

.auth-intro {
  max-width: 33rem;
  margin: 1rem 0 0;
  color: var(--muted);
  font-size: 0.89rem;
  line-height: 1.6;
}

.auth-tabs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin: 1.55rem 0 1.1rem;
  border-bottom: 1px solid var(--line);
}

.auth-tabs button {
  min-height: 2.75rem;
  border: 0;
  border-bottom: 2px solid transparent;
  padding: 0.45rem 0.5rem;
  background: transparent;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  text-align: left;
}

.auth-tabs button:hover,
.auth-tabs button[aria-pressed="true"] {
  border-color: var(--accent);
  color: var(--paper);
}

.auth-tabs button[aria-pressed="true"] {
  background: linear-gradient(to top, color-mix(in srgb, var(--accent) 12%, transparent), transparent);
}

.auth-status {
  margin: 0 0 1rem;
  border-left: 3px solid var(--accent);
  padding: 0.65rem 0.8rem;
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  color: var(--paper);
  font-size: 0.8rem;
  line-height: 1.45;
}

.auth-status[data-tone="error"] {
  border-color: var(--expense);
  background: color-mix(in srgb, var(--expense) 11%, transparent);
}

.auth-status[data-tone="success"] {
  border-color: var(--income);
  background: color-mix(in srgb, var(--income) 11%, transparent);
}

.auth-status[data-tone="pending"] {
  border-color: var(--amber);
}

.auth-card form {
  display: grid;
  gap: 0.42rem;
}

.auth-card form[hidden] {
  display: none;
}

.auth-card h2 {
  margin: 0;
  font-size: 1.06rem;
}

.auth-form-copy {
  margin: 0 0 0.55rem;
  color: var(--muted);
  font-size: 0.83rem;
  line-height: 1.5;
}

.auth-card label {
  margin-top: 0.35rem;
}

.auth-card input:not([type="hidden"]) {
  min-height: 2.65rem;
  border-radius: 8px;
  transition: border-color 150ms ease, box-shadow 150ms ease, background 150ms ease;
}

.auth-card input:not([type="hidden"]):hover {
  border-color: color-mix(in srgb, var(--accent) 65%, var(--line));
}

.auth-card input:not([type="hidden"]):focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
}

.auth-field-hint {
  margin: 0.08rem 0 0;
  color: var(--muted);
  font-size: 0.68rem;
}

.auth-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1rem;
  align-items: center;
  margin-top: 0.9rem;
}

.auth-submit {
  min-height: 2.6rem;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 0.55rem 1rem;
  background: var(--accent);
  color: var(--ink);
  font-size: 0.83rem;
  font-weight: 800;
}

.auth-submit:hover:not(:disabled) {
  filter: brightness(1.08);
  transform: translateY(-1px);
}

.auth-submit:disabled {
  cursor: wait;
  opacity: 0.68;
}

.auth-link {
  border: 0;
  padding: 0.4rem 0;
  background: transparent;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--muted) 55%, transparent);
  text-underline-offset: 0.25rem;
}

.auth-link:hover {
  color: var(--paper);
  text-decoration-color: var(--accent);
}

@media (max-width: 760px) {
  #authRoot:not([hidden]) {
    display: block;
    padding: 0;
  }

  .auth-shell {
    display: block;
    width: 100%;
    min-height: 100dvh;
    height: auto;
    grid-template-columns: 1fr;
    overflow: visible;
    border: 0;
    border-radius: 0;
    box-shadow: none;
  }

  .auth-ledger {
    display: flex;
    min-height: 5.75rem;
    align-items: center;
    border-right: 0;
    border-bottom: 1px solid var(--line);
    padding: 1.25rem;
  }

  .auth-ledger-copy {
    display: block;
    margin: 0 0 0 1rem;
  }

  .auth-ledger-title {
    display: none;
  }

  .auth-ledger-title + p,
  .auth-flow {
    display: none;
  }

  .auth-ledger .auth-kicker {
    margin: 0;
    font-size: 0.6rem;
  }

  .auth-ledger::after {
    right: 1.25rem;
    bottom: 0.65rem;
    left: auto;
    width: 4rem;
  }

  .auth-panel {
    place-items: start center;
    padding: 2rem 1.25rem 3rem;
  }
}

@media (max-width: 390px) {
  .auth-tabs button {
    font-size: 0.72rem;
  }

  .auth-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .auth-submit {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .auth-card input:not([type="hidden"]),
  .auth-submit {
    transition: none;
  }

  .auth-submit:hover:not(:disabled) {
    transform: none;
  }
}

@media (prefers-contrast: more) {
  .auth-tabs button,
  .auth-card input:not([type="hidden"]),
  .auth-submit {
    border-color: currentColor;
  }
}