:root {
  --ink: oklch(0.24 0.02 255);
  --ink-soft: oklch(0.44 0.02 255);
  --ink-faint: oklch(0.60 0.015 255);
  --line: oklch(0.90 0.012 255);
  --line-soft: oklch(0.94 0.008 255);
  --surface: oklch(0.995 0.004 255);
  --surface-2: oklch(0.975 0.006 255);
  --field: oklch(1 0 0);
  --brand: oklch(0.45 0.105 250);
  --brand-deep: oklch(0.37 0.105 254);
  --brand-lite: oklch(0.60 0.13 234);
  --danger: oklch(0.55 0.17 25);
  --danger-bg: oklch(0.96 0.03 25);
  --radius: 16px;
  --radius-sm: 11px;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-quart: cubic-bezier(0.25, 1, 0.5, 1);
  --shadow-sm: 0 1px 2px oklch(0.3 0.05 255 / 0.06);
  --shadow-md: 0 8px 24px -8px oklch(0.3 0.06 255 / 0.18);
  --shadow-lg: 0 24px 60px -16px oklch(0.3 0.08 255 / 0.35);
}

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

html, body {
  height: 100%;
}

body {
  font-family: "Instrument Sans", system-ui, sans-serif;
  font-optical-sizing: auto;
  color: var(--ink);
  background: var(--surface);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3 {
  text-wrap: balance;
}

.stage {
  min-height: 100dvh;
  display: grid;
  grid-template-columns: 1.05fr 1fr;
}

.brand {
  position: relative;
  overflow: hidden;
  color: oklch(0.98 0.01 255);
  background: linear-gradient(158deg, oklch(0.29 0.075 260) 0%, oklch(0.38 0.095 244) 52%, oklch(0.46 0.085 222) 100%);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: clamp(2.2rem, 4vw, 3.5rem);
  isolation: isolate;
}

.aurora {
  position: absolute;
  border-radius: 50%;
  filter: blur(56px);
  z-index: -1;
  will-change: transform;
  opacity: 0.85;
}

  .aurora.a {
    width: 46vh;
    height: 46vh;
    left: -6vh;
    top: 30%;
    background: radial-gradient(circle, oklch(0.72 0.15 38 / 0.62), transparent 68%);
    animation: driftA 22s var(--ease-quart) infinite alternate;
  }

  .aurora.b {
    width: 40vh;
    height: 40vh;
    right: -8vh;
    top: -6vh;
    background: radial-gradient(circle, oklch(0.72 0.14 208 / 0.55), transparent 68%);
    animation: driftB 26s var(--ease-quart) infinite alternate;
  }

  .aurora.c {
    width: 34vh;
    height: 34vh;
    right: 12%;
    bottom: 8%;
    background: radial-gradient(circle, oklch(0.56 0.16 300 / 0.42), transparent 70%);
    animation: driftC 30s var(--ease-quart) infinite alternate;
  }

@keyframes driftA {
  to {
    transform: translate(14vh, -10vh) scale(1.15);
  }
}

@keyframes driftB {
  to {
    transform: translate(-10vh, 12vh) scale(1.1);
  }
}

@keyframes driftC {
  to {
    transform: translate(8vh, -8vh) scale(0.9);
  }
}

.brand::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image: linear-gradient(oklch(1 0 0 / 0.04) 1px, transparent 1px), linear-gradient(90deg, oklch(1 0 0 / 0.04) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(circle at 40% 30%, black, transparent 82%);
}

.brand-mark {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  font-size: 0.82rem;
  text-transform: uppercase;
}

  .brand-mark .glyph {
    width: 120px;
    height: 120px;
    display: grid;
    place-items: center;
    overflow: hidden;
  }

    .brand-mark .glyph svg, .brand-mark .glyph img {
      display: block;
      max-width: 100%;
      height: auto;
    }

  .brand-mark small {
    display: block;
    font-size: 0.66rem;
    letter-spacing: 0.22em;
    color: oklch(0.9 0.02 220 / 0.72);
    font-weight: 500;
  }

.brand-hero {
  max-width: 70%;
}

  .brand-hero h2 {
    font-family: "Instrument Serif", Georgia, serif;
    font-weight: 400;
    font-size: clamp(2.6rem, 5vw, 4rem);
    line-height: 1.02;
    letter-spacing: -0.01em;
  }

    .brand-hero h2 em {
      font-style: italic;
      color: oklch(0.86 0.07 210);
    }

  .brand-hero p {
    margin-top: 1.25rem;
    max-width: 34ch;
    color: oklch(0.92 0.02 230 / 0.82);
    font-size: 1.02rem;
    line-height: 1.6;
  }

.brand-foot {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.8rem;
  color: oklch(0.9 0.02 230 / 0.62);
}

  .brand-foot .dot {
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: oklch(0.8 0.1 150);
    box-shadow: 0 0 0 4px oklch(0.8 0.1 150 / 0.2);
  }

.waves {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 120px;
  z-index: -1;
  opacity: 0.5;
}

  .waves svg {
    width: 200%;
    height: 100%;
    display: block;
  }

  .waves .w1 {
    animation: swell 14s linear infinite;
  }

  .waves .w2 {
    animation: swell 20s linear infinite reverse;
    opacity: 0.6;
  }

@keyframes swell {
  to {
    transform: translateX(-50%);
  }
}

.form-side {
  display: grid;
  place-items: center;
  padding: clamp(1.5rem, 4vw, 3rem);
  background: radial-gradient(120% 90% at 100% 0%, var(--surface-2), var(--surface) 60%);
}

.form-wrap {
  width: 100%;
  max-width: 400px;
}

.mini-brand {
  display: none;
}

.form-head {
  margin-bottom: 1.9rem;
}

  .form-head .eyebrow {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.16em;
    font-weight: 600;
    color: var(--brand);
  }

  .form-head h1 {
    font-size: 2rem;
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-top: 0.5rem;
  }

  .form-head p {
    margin-top: 0.6rem;
    color: var(--ink-soft);
    font-size: 0.96rem;
    line-height: 1.55;
  }

.alert {
  display: none;
  align-items: flex-start;
  gap: 0.6rem;
  background: var(--danger-bg);
  color: var(--danger);
  border: 1px solid oklch(0.85 0.08 25);
  border-radius: var(--radius-sm);
  padding: 0.8rem 0.9rem;
  font-size: 0.88rem;
  line-height: 1.45;
  margin-bottom: 1.1rem;
}

  .alert.show {
    display: flex;
    animation: rise 0.4s var(--ease-out) both;
  }

  .alert svg {
    flex-shrink: 0;
    margin-top: 1px;
  }

  .alert :is(ul, div) {
    margin: 0;
    padding: 0;
    list-style: none;
  }

.field {
  position: relative;
  margin-bottom: 1.05rem;
}

  .field .lead-icon {
    position: absolute;
    left: 14px;
    top: 28px;
    transform: translateY(-50%);
    color: var(--ink-faint);
    transition: color 0.25s var(--ease-quart);
    pointer-events: none;
  }

  .field input {
    width: 100%;
    height: 56px;
    padding: 1.35rem 2.9rem 0.4rem 2.9rem;
    font: inherit;
    font-size: 0.98rem;
    color: var(--ink);
    background: var(--field);
    border: 1.5px solid var(--line);
    border-radius: var(--radius-sm);
    outline: none;
    transition: border-color 0.25s var(--ease-quart), box-shadow 0.25s var(--ease-quart), background 0.25s var(--ease-quart);
  }

  .field label {
    position: absolute;
    left: 2.9rem;
    top: 28px;
    transform: translateY(-50%);
    color: var(--ink-faint);
    font-size: 0.98rem;
    pointer-events: none;
    transition: transform 0.22s var(--ease-out), font-size 0.22s var(--ease-out), color 0.22s var(--ease-out);
  }

  .field input:focus {
    border-color: var(--brand-lite);
    box-shadow: 0 0 0 4px oklch(0.60 0.13 234 / 0.16);
  }

    .field input:focus + label, .field input:not(:placeholder-shown) + label {
      transform: translateY(-1.9rem) scale(0.8);
      color: var(--brand);
      font-weight: 500;
    }

  .field:focus-within .lead-icon {
    color: var(--brand);
  }

  .field .toggle {
    position: absolute;
    right: 8px;
    top: 28px;
    transform: translateY(-50%);
    display: grid;
    place-items: center;
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    color: var(--ink-faint);
    border-radius: 9px;
    cursor: pointer;
    transition: color 0.2s, background 0.2s;
  }

    .field .toggle:hover {
      color: var(--brand);
      background: var(--surface-2);
    }

    .field .toggle:focus-visible {
      outline: 2px solid var(--brand-lite);
      outline-offset: 2px;
    }

.field-error {
  display: block;
  margin: 0.35rem 0 0 0.3rem;
  font-size: 0.8rem;
  color: var(--danger);
}

.options {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 0.35rem 0 1.6rem;
  font-size: 0.9rem;
}

.remember {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--ink-soft);
  cursor: pointer;
  user-select: none;
}

  .remember input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
  }

  .remember .box {
    width: 19px;
    height: 19px;
    border: 1.5px solid var(--line);
    border-radius: 6px;
    display: grid;
    place-items: center;
    background: var(--field);
    transition: background 0.2s var(--ease-quart), border-color 0.2s;
  }

    .remember .box svg {
      opacity: 0;
      transform: scale(0.6);
      transition: opacity 0.18s, transform 0.18s var(--ease-out);
      color: #fff;
    }

  .remember input:checked + .box {
    background: var(--brand);
    border-color: var(--brand);
  }

    .remember input:checked + .box svg {
      opacity: 1;
      transform: scale(1);
    }

  .remember input:focus-visible + .box {
    box-shadow: 0 0 0 4px oklch(0.60 0.13 234 / 0.2);
  }

.link {
  color: var(--brand);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

  .link:hover {
    color: var(--brand-deep);
    text-decoration: underline;
    text-underline-offset: 3px;
  }

.submit {
  position: relative;
  width: 100%;
  height: 54px;
  border: none;
  border-radius: var(--radius-sm);
  color: oklch(0.99 0.01 255);
  font: inherit;
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: 0.01em;
  cursor: pointer;
  overflow: hidden;
  background: linear-gradient(180deg, var(--brand), var(--brand-deep));
  box-shadow: var(--shadow-md);
  transition: transform 0.25s var(--ease-out), box-shadow 0.25s var(--ease-out), filter 0.25s;
  display: grid;
  place-items: center;
}

  .submit .label-row {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    transition: opacity 0.2s, transform 0.2s;
  }

  .submit::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(110deg, transparent 30%, oklch(1 0 0 / 0.25) 50%, transparent 70%);
    transform: translateX(-120%);
    transition: transform 0.7s var(--ease-quart);
  }

  .submit:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    filter: brightness(1.05);
  }

    .submit:hover::after {
      transform: translateX(120%);
    }

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

  .submit:focus-visible {
    outline: 2px solid var(--brand-lite);
    outline-offset: 3px;
  }

  .submit .spinner {
    position: absolute;
    width: 20px;
    height: 20px;
    border: 2.5px solid oklch(1 0 0 / 0.35);
    border-top-color: #fff;
    border-radius: 50%;
    opacity: 0;
    animation: spin 0.7s linear infinite;
  }

  .submit.loading .label-row {
    opacity: 0;
    transform: translateY(4px);
  }

  .submit.loading .spinner {
    opacity: 1;
  }

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

.foot-note {
  margin-top: 1.7rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--line-soft);
  font-size: 0.86rem;
  color: var(--ink-faint);
  line-height: 1.55;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

  .foot-note svg {
    flex-shrink: 0;
    color: var(--ink-faint);
  }

.reveal {
  opacity: 0;
  transform: translateY(14px);
  animation: rise 0.7s var(--ease-out) forwards;
  animation-delay: calc(var(--i, 0) * 70ms + 0.1s);
}

.stack {
  border: 0;
  padding: 0;
  margin: 0;
  min-inline-size: auto;
}

  .stack[disabled] {
    opacity: 0.55;
    pointer-events: none;
  }

.notice {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  background: var(--surface-2);
  color: var(--ink-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 0.8rem 0.9rem;
  font-size: 0.88rem;
  line-height: 1.45;
  margin-bottom: 1.1rem;
}

  .notice svg {
    flex-shrink: 0;
    margin-top: 1px;
    color: var(--brand);
  }

@keyframes rise {
  to {
    opacity: 1;
    transform: none;
  }
}

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

  .brand {
    display: none;
  }

  .form-side {
    align-items: center;
    padding-top: 0;
  }

  .form-wrap {
    max-width: 440px;
    padding-top: 2rem;
  }

  .mini-brand {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: -0.5rem 0 2rem;
    padding: 1.1rem 1.25rem;
    border-radius: var(--radius);
    color: oklch(0.98 0.01 255);
    background: linear-gradient(140deg, oklch(0.31 0.08 258), oklch(0.44 0.09 226));
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-md);
  }

    .mini-brand .glyph {
      width: 5em;
      height: 5em;
      display: grid;
      place-items: center;
      overflow: hidden;
    }

      .mini-brand .glyph img {
        max-width: 100%;
        height: auto;
      }

    .mini-brand .txt {
      font-weight: 600;
      letter-spacing: 0.1em;
      text-transform: uppercase;
      font-size: 0.8rem;
    }

      .mini-brand .txt small {
        display: block;
        font-size: 0.62rem;
        letter-spacing: 0.2em;
        color: oklch(0.9 0.02 220 / 0.72);
        font-weight: 500;
      }
}

@media (max-width: 420px) {
  .form-head h1 {
    font-size: 1.7rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .aurora, .waves .w1, .waves .w2 {
    animation: none !important;
  }

  .reveal {
    animation: none !important;
    opacity: 1;
    transform: none;
  }

  .submit::after {
    display: none;
  }
}