:root {
  --bg: #0a0e13;
  --bg2: #0f1419;
  --bg3: #141920;
  --sky: #ff9900;
  --sky2: #ffb84d;
  --green: #3dcc8e;
  --text: #e4eef8;
  --text2: #8aaec8;
  --text3: #6b8499;
  --border: #1e3050;
  --border2: #2a4060;
  --red: #e85a5a;
  --silk: cubic-bezier(0.16, 1, 0.3, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  min-height: 100%;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.5;
}

a {
  color: var(--sky);
  text-decoration: none;
}

a:hover {
  color: var(--sky2);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 12px;
  z-index: 20;
  padding: 8px 14px;
  background: var(--bg3);
  color: var(--text);
  border: 1px solid var(--border2);
  border-radius: 8px;
  font-weight: 600;
  font-size: 14px;
}

.skip-link:focus {
  left: 12px;
}

.auth-page {
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
}

.auth-visual {
  position: relative;
  padding: 36px 48px 40px;
  display: flex;
  flex-direction: column;
  gap: 36px;
  overflow: hidden;
  background:
    radial-gradient(ellipse 80% 55% at 12% 8%, rgba(255, 153, 0, 0.2), transparent 55%),
    radial-gradient(ellipse 55% 40% at 92% 88%, rgba(61, 204, 142, 0.1), transparent 50%),
    var(--bg2);
  border-right: 1px solid var(--border);
}

.auth-visual::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(45deg, transparent 0, transparent 119px, rgba(255, 153, 0, 0.22) 119px, rgba(255, 153, 0, 0.22) 120px);
  -webkit-mask-image: radial-gradient(ellipse 85% 80% at 0% 100%, #000 0%, transparent 70%);
  mask-image: radial-gradient(ellipse 85% 80% at 0% 100%, #000 0%, transparent 70%);
  pointer-events: none;
}

.auth-brand {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  width: fit-content;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text);
}

.auth-brand:hover {
  color: var(--text);
}

.auth-brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--sky), #ea580c);
  display: grid;
  place-items: center;
  font-size: 1.1rem;
}

.auth-visual-copy {
  position: relative;
  z-index: 1;
  max-width: 460px;
}

.auth-visual-copy .tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--sky);
  margin-bottom: 14px;
}

.tag-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(61, 204, 142, 0.16);
}

.auth-visual-copy h2 {
  font-size: clamp(2rem, 3.6vw, 2.7rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.12;
  margin-bottom: 12px;
}

.auth-visual-copy p {
  color: var(--text2);
  font-size: 1.05rem;
  max-width: 38ch;
}

.auth-points {
  position: relative;
  z-index: 1;
  list-style: none;
  display: grid;
  gap: 12px;
  margin-top: auto;
}

.auth-points li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  color: var(--text2);
  font-size: 0.92rem;
}

.auth-points svg {
  flex-shrink: 0;
  margin-top: 2px;
  stroke: var(--green);
}

.auth-preview {
  position: relative;
  z-index: 1;
  margin-top: 8px;
  background: #f1f5f9;
  color: #0f172a;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--border);
  max-width: 420px;
  box-shadow: 0 24px 50px rgba(0, 0, 0, 0.28);
}

.auth-preview-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 14px;
  background: var(--bg3);
  color: var(--text);
}

.auth-preview-bar span:last-child {
  margin-left: auto;
  font-size: 11px;
  font-weight: 600;
  color: var(--sky);
  background: rgba(255, 153, 0, 0.12);
  border: 1px solid rgba(255, 153, 0, 0.28);
  border-radius: 999px;
  padding: 2px 8px;
}

.dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
}

.auth-preview-body {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 180px;
}

.bubble {
  max-width: 86%;
  padding: 9px 12px;
  border-radius: 14px;
  font-size: 0.86rem;
}

.bubble.them {
  background: #fff;
  border-bottom-left-radius: 4px;
  align-self: flex-start;
}

.bubble.you {
  background: #fff7ed;
  border-bottom-right-radius: 4px;
  align-self: flex-end;
}

.bubble .who {
  font-size: 0.7rem;
  font-weight: 700;
  color: #c2410c;
  margin-bottom: 2px;
}

.auth-panel {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px 32px;
}

.auth-card {
  width: min(440px, 100%);
}

.auth-switch {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
  padding: 4px;
  margin-bottom: 28px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.auth-switch a {
  text-align: center;
  padding: 10px 12px;
  border-radius: 9px;
  color: var(--text2);
  font-size: 0.92rem;
  font-weight: 600;
}

.auth-switch a:hover {
  color: var(--text);
}

.auth-switch a[aria-current="page"] {
  background: var(--bg3);
  color: var(--text);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.04);
}

.auth-card h1 {
  font-size: 1.7rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 6px;
}

.auth-card .lead {
  color: var(--text2);
  margin-bottom: 24px;
  font-size: 0.95rem;
}

.field {
  margin-bottom: 16px;
}

.field-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
}

.field label {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--text);
}

.field-count {
  font-size: 0.75rem;
  color: var(--text3);
}

.input-wrap {
  position: relative;
}

.field input {
  width: 100%;
  height: 48px;
  padding: 0 14px;
  border-radius: 10px;
  border: 1px solid var(--border2);
  background: var(--bg2);
  color: var(--text);
  font: inherit;
  font-size: 1rem;
}

.field input.has-toggle {
  padding-right: 52px;
}

.field input:hover {
  border-color: #3a5478;
}

.field input:focus {
  outline: 2px solid var(--sky);
  outline-offset: 1px;
  border-color: var(--sky);
}

.field input.is-invalid {
  border-color: var(--red);
}

.field input.is-invalid:focus {
  outline-color: var(--red);
}

.toggle-secret {
  position: absolute;
  top: 50%;
  right: 6px;
  transform: translateY(-50%);
  width: 40px;
  height: 36px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--text2);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  cursor: pointer;
}

.toggle-secret:hover,
.toggle-secret:focus-visible {
  color: var(--text);
  background: rgba(255, 255, 255, 0.05);
}

.hint,
.field-error,
.caps-warn {
  margin-top: 6px;
  font-size: 0.8rem;
}

.username-status {
  display: none;
  margin-top: 6px;
  font-size: 0.8rem;
  font-weight: 600;
}

.username-status.visible {
  display: block;
}

.username-status.checking {
  color: var(--text3);
  font-weight: 500;
}

.username-status.ok {
  color: var(--green);
}

.username-status.taken {
  color: #fca5a5;
}

.field input.is-available {
  border-color: rgba(61, 204, 142, 0.55);
}

.field-error {
  display: none;
  color: #fca5a5;
}

.field-error.visible {
  display: block;
}

.caps-warn {
  display: none;
  color: var(--sky2);
}

.caps-warn.visible {
  display: block;
}

.strength {
  display: none;
  margin-top: 8px;
}

.strength.visible {
  display: block;
}

.strength-bar {
  display: flex;
  gap: 4px;
  height: 4px;
}

.strength-bar span {
  flex: 1;
  border-radius: 99px;
  background: var(--border2);
}

.strength-bar[data-level="1"] span:nth-child(1) { background: var(--red); }
.strength-bar[data-level="2"] span:nth-child(-n+2) { background: var(--sky); }
.strength-bar[data-level="3"] span { background: var(--green); }

.strength-label {
  margin-top: 6px;
  font-size: 0.75rem;
  color: var(--text3);
}

.auth-error {
  display: none;
  background: rgba(232, 90, 90, 0.12);
  border: 1px solid rgba(232, 90, 90, 0.35);
  color: #fecaca;
  padding: 10px 14px;
  border-radius: 10px;
  margin-bottom: 16px;
  font-size: 0.9rem;
}

.auth-error.visible {
  display: block;
}

.btn-auth {
  width: 100%;
  margin-top: 8px;
  min-height: 48px;
  padding: 12px 18px;
  border: 0;
  border-radius: 10px;
  background: var(--sky);
  color: #0a1a2c;
  font: inherit;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: background 0.3s var(--silk), transform 0.3s var(--silk);
}

.btn-auth:hover {
  background: var(--sky2);
  transform: translateY(-1px);
}

.btn-auth:focus-visible {
  outline: 2px solid var(--sky2);
  outline-offset: 2px;
}

.btn-auth:disabled {
  opacity: 0.7;
  cursor: wait;
  transform: none;
}

.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(10, 26, 44, 0.25);
  border-top-color: #0a1a2c;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.auth-home {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 22px;
  color: var(--text3);
  font-size: 0.88rem;
}

.auth-home:hover {
  color: var(--sky);
}

@media (max-width: 900px) {
  .auth-page {
    grid-template-columns: 1fr;
  }

  .auth-visual {
    padding: 20px 20px 18px;
    gap: 16px;
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }

  .auth-visual-copy h2,
  .auth-visual-copy p,
  .auth-points,
  .auth-preview {
    display: none;
  }

  .auth-panel {
    padding: 28px 20px 40px;
    align-items: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .btn-auth,
  .spinner {
    transition: none;
    animation: none;
  }
}