:root {
  color-scheme: light dark;
}

:root[data-theme="dark"] {
  --bg: #000000;
  --bg-elev: #0a0a0a;
  --panel: #050505;
  --text: #f5f5f5;
  --text-muted: #a3a3a3;
  --border: #303030;
  --danger-border: #ef4444;
  --danger-bg: rgba(127, 29, 29, 0.52);
  --danger-text: #fecaca;
  --hero-overlay: rgba(0, 0, 0, 0.58);
  --input-bg: #0b0b0b;
  --btn-bg: #f2f2f2;
  --btn-text: #0a0a0a;
}

:root[data-theme="light"] {
  --bg: #ffffff;
  --bg-elev: #f6f6f6;
  --panel: #ffffff;
  --text: #0b0b0b;
  --text-muted: #525252;
  --border: #d4d4d4;
  --danger-border: #b91c1c;
  --danger-bg: #fee2e2;
  --danger-text: #7f1d1d;
  --hero-overlay: rgba(255, 255, 255, 0.62);
  --input-bg: #ffffff;
  --btn-bg: #090909;
  --btn-text: #f7f7f7;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: "Montserrat", "Avenir Next", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}

.auth-layout {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
}

.auth-visual {
  position: relative;
  overflow: hidden;
  border-right: 1px solid var(--border);
  background: var(--bg-elev);
}

.visual-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(100%) contrast(110%);
}

.visual-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to top, var(--hero-overlay), transparent 40%),
    linear-gradient(to right, transparent 65%, var(--hero-overlay)),
    repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.04) 0 1px, transparent 1px 34px),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.04) 0 1px, transparent 1px 34px);
}

.auth-panel {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2.5rem;
  background: linear-gradient(180deg, var(--panel), var(--bg));
}

.auth-card {
  width: min(460px, 100%);
}

.auth-card.shake {
  animation: cardShake 260ms ease;
}

.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

.brand {
  display: inline-flex;
  align-items: center;
}

.brand-logo {
  display: block;
  width: auto;
  height: 44px;
  filter: none;
  opacity: 0.98;
}

:root[data-theme="light"] .brand-logo {
  filter: invert(1) brightness(0);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.6rem;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  font: inherit;
  cursor: pointer;
  transition: background-color 180ms ease;
}

.theme-toggle:hover {
  background: color-mix(in srgb, var(--text) 10%, transparent);
}

.theme-icon {
  width: 16px;
  height: 16px;
}

.title {
  margin: 0 0 0.45rem;
  font-size: clamp(1.25rem, 2.1vw, 1.5rem);
  line-height: 1;
  font-weight: 600;
}

.title-desc {
  margin: 0 0 1.25rem;
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.45;
  max-width: 38ch;
}

.form-group {
  margin-bottom: 1.1rem;
}

.label {
  display: block;
  margin-bottom: 0.48rem;
  font-size: 0.92rem;
  color: var(--text-muted);
  transition: color 180ms ease, transform 180ms ease;
}

.form-group:focus-within .label {
  color: var(--text);
  transform: translateY(-1px);
}

.input-shell {
  position: relative;
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.input-shell:focus-within {
  transform: translateY(-1px);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--text) 35%, transparent);
}

.input-icon {
  position: absolute;
  left: 0.8rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  transition: color 180ms ease, transform 180ms ease;
}

.input-shell:focus-within .input-icon {
  color: var(--text);
  transform: translateY(-50%) scale(1.06);
}

.input-icon svg {
  width: 17px;
  height: 17px;
}

.input {
  width: 100%;
  padding: 0.86rem 0.95rem;
  border: 1px solid var(--border);
  background: var(--input-bg);
  color: var(--text);
  font: inherit;
  transition: border-color 180ms ease, background-color 180ms ease, box-shadow 180ms ease;
}

.input-has-icon {
  padding-left: 2.45rem;
}

.input-has-trailing {
  padding-right: 2.65rem;
}

.password-toggle {
  position: absolute;
  right: 0.52rem;
  top: 50%;
  transform: translateY(-50%);
  width: 30px;
  height: 30px;
  border: 0;
  background: transparent;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: color 180ms ease, transform 180ms ease, opacity 180ms ease;
}

.password-toggle:hover {
  color: var(--text);
  transform: translateY(-50%) scale(1.05);
}

.password-toggle:focus-visible {
  outline: 2px solid var(--text);
  outline-offset: 2px;
}

.password-toggle svg {
  width: 17px;
  height: 17px;
}

.input.is-invalid {
  border-color: var(--danger-border);
  outline: 1px solid var(--danger-border);
}

.input.error-pulse {
  animation: inputErrorPulse 340ms ease;
}

.input:focus-visible {
  outline: 2px solid var(--text);
  outline-offset: -2px;
}

.form-error {
  display: none;
  margin-bottom: 0.85rem;
  padding: 0.62rem 0.75rem;
  border: 1px solid var(--danger-border);
  color: var(--danger-text);
  font-size: 0.88rem;
  background: var(--danger-bg);
}

.form-error.is-visible {
  display: block;
  animation: errorReveal 220ms ease;
}

.submit {
  width: 100%;
  margin-top: 0.35rem;
  padding: 0.92rem 1rem;
  border: 1px solid var(--border);
  background: var(--btn-bg);
  color: var(--btn-text);
  font: inherit;
  font-weight: 600;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: transform 180ms ease, opacity 180ms ease, box-shadow 180ms ease, background-color 180ms ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.48rem;
}

.submit:hover {
  transform: translateY(-1px);
  opacity: 0.96;
  box-shadow: 0 6px 14px rgba(0, 0, 0, 0.25);
}

.submit:hover .btn-icon {
  transform: translateX(1px);
}

.btn-icon {
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
  transition: transform 180ms ease;
}

.submit:active {
  transform: translateY(0);
}

.submit:focus-visible,
.theme-toggle:focus-visible {
  outline: 2px solid var(--text);
  outline-offset: 2px;
}

.submit.is-loading {
  opacity: 0.74;
  pointer-events: none;
}

.auth-divider {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0.92rem 0 0.75rem;
  color: var(--text-muted);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.auth-divider::before,
.auth-divider::after {
  content: "";
  flex: 1;
  border-top: 1px solid var(--border);
}

.google-auth-btn {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--border);
  background: var(--input-bg);
  color: var(--text);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.52rem;
  font-size: 0.9rem;
  font-weight: 600;
  transition: transform 180ms ease, background-color 180ms ease, border-color 180ms ease;
}

.google-auth-btn:hover {
  transform: translateY(-1px);
  background: color-mix(in srgb, var(--text) 7%, transparent);
  border-color: color-mix(in srgb, var(--text) 28%, var(--border));
}

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

.google-auth-icon {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
}

.subrow {
  margin-top: 0.9rem;
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
  align-items: center;
}

.hint {
  font-size: 0.86rem;
  color: var(--text-muted);
}

.link {
  font-size: 0.86rem;
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid var(--border);
}

.fade-up {
  opacity: 0;
  animation: fadeUp 420ms ease forwards;
}

.delay-1 {
  animation-delay: 70ms;
}

.delay-2 {
  animation-delay: 140ms;
}

.delay-3 {
  animation-delay: 210ms;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes errorReveal {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes inputErrorPulse {
  0% {
    box-shadow: 0 0 0 0 rgba(220, 38, 38, 0.25);
  }
  50% {
    box-shadow: 0 0 0 4px rgba(220, 38, 38, 0.18);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(220, 38, 38, 0);
  }
}

@keyframes cardShake {
  0%, 100% {
    transform: translateX(0);
  }
  20% {
    transform: translateX(-3px);
  }
  40% {
    transform: translateX(3px);
  }
  60% {
    transform: translateX(-2px);
  }
  80% {
    transform: translateX(2px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .fade-up {
    animation: none;
    opacity: 1;
  }
  .submit,
  .theme-toggle {
    transition: none;
  }
  .input-shell,
  .label,
  .input-icon,
  .input,
  .btn-icon {
    transition: none;
  }
  .auth-card.shake,
  .input.error-pulse,
  .form-error.is-visible {
    animation: none;
  }
}

@media (max-width: 1100px) {
  .auth-layout {
    grid-template-columns: 1fr;
  }
  .auth-visual {
    min-height: 35vh;
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }
}

@media (max-width: 540px) {
  .auth-panel {
    padding: 1.45rem;
  }
}