:root {
  --bg: #f7f6f3;
  --card: #ffffff;
  --soft: #f3f2ef;
  --line: #deddd8;
  --line-strong: #cecdc7;
  --text: #181a19;
  --muted: #747875;
  --muted-2: #9a9d9a;
  --accent: #151716;
  --link: #3f62a8;
  --success: #248256;
  --danger: #c44759;
  --mono: "Cascadia Code", "SFMono-Regular", Consolas, monospace;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html, body { min-height: 100%; margin: 0; }
body {
  min-height: 100vh;
  background:
    radial-gradient(circle at 50% 10%, rgba(255, 255, 255, .95), transparent 38%),
    var(--bg);
  color: var(--text);
  font-family: var(--sans);
}
button, input { font: inherit; }
button { color: inherit; }
[hidden] { display: none !important; }

.auth-shell {
  position: relative;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 84px 20px 42px;
}
.auth-brand {
  position: absolute;
  top: 30px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: baseline;
  color: var(--text);
  font-size: 15px;
  font-weight: 750;
  letter-spacing: -.45px;
  text-decoration: none;
}
.auth-brand em { color: #6f7470; font-style: normal; }

.auth-card {
  width: min(470px, 100%);
  overflow: hidden;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: 0 22px 65px rgba(28, 29, 27, .07);
}
.auth-content { padding: 31px 32px 34px; }
.auth-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
  padding: 4px;
  background: var(--soft);
  border: 1px solid #e8e7e3;
  border-radius: 10px;
}
.auth-tabs button {
  height: 40px;
  background: transparent;
  border: 0;
  border-radius: 7px;
  color: var(--muted);
  cursor: pointer;
  font-size: 11px;
  font-weight: 650;
  transition: background .16s, color .16s, box-shadow .16s;
}
.auth-tabs button:hover { color: var(--text); }
.auth-tabs button[aria-selected="true"] { background: var(--accent); color: #fff; box-shadow: 0 3px 10px rgba(20, 22, 21, .12); }

.auth-card section > header { margin: 30px 0 23px; text-align: center; }
.auth-card header p { margin: 0 0 8px; color: var(--muted-2); font: 700 8px var(--mono); letter-spacing: 1.1px; }
.auth-card h1 { margin: 0; font-size: 25px; line-height: 1.2; letter-spacing: -.85px; }
.auth-field { display: block; margin-top: 16px; }
.auth-field > span:first-child { display: block; margin-bottom: 8px; color: #303331; font-size: 10px; font-weight: 650; }
.auth-field input {
  width: 100%;
  height: 49px;
  padding: 0 14px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  outline: 0;
  color: var(--text);
  font-size: 11px;
  transition: border-color .17s, box-shadow .17s, background .17s;
}
.auth-field input::placeholder { color: #a1a49f; }
.auth-field input:hover { border-color: #c5c6c1; }
.auth-field input:focus { border-color: #737873; box-shadow: 0 0 0 3px rgba(28, 31, 29, .07); }
.auth-field input[aria-invalid="true"] { border-color: #d37381; box-shadow: 0 0 0 3px rgba(196, 71, 89, .08); }
.password-field { position: relative; }
.password-field input { padding-right: 63px; }
.password-field button {
  position: absolute;
  top: 50%;
  right: 9px;
  transform: translateY(-50%);
  padding: 7px;
  background: transparent;
  border: 0;
  color: #6e7470;
  cursor: pointer;
  font: 700 8px var(--mono);
}
.password-field button:hover { color: var(--text); }
.field-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 11px; }
.form-between { display: flex; justify-content: flex-end; margin-top: 13px; }
.text-button { padding: 3px 0; background: transparent; border: 0; color: var(--link); cursor: pointer; font-size: 9px; }
.text-button:hover { text-decoration: underline; text-underline-offset: 3px; }
.auth-submit {
  width: 100%;
  height: 49px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 11px;
  margin-top: 24px;
  padding: 0 15px;
  background: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 10px;
  color: #fff;
  cursor: pointer;
  font-size: 11px;
  font-weight: 700;
  transition: background .16s, transform .16s, box-shadow .16s;
}
.auth-submit:hover { background: #272a28; box-shadow: 0 9px 22px rgba(18, 20, 19, .1); transform: translateY(-1px); }
.auth-submit:active { transform: none; }
.auth-submit:disabled { cursor: wait; opacity: .65; transform: none; }
.auth-submit b { font-size: 13px; font-weight: 500; }
.field-error { display: block; margin-top: 6px; color: var(--danger); font-size: 9px; line-height: 1.45; }
.form-status { margin: 12px 0 0; padding: 10px 11px; background: #fff4f5; border: 1px solid #edc9cf; border-radius: 8px; color: #a93b4c; font-size: 9px; line-height: 1.5; animation: status-in .18s ease; }
.form-status.ready { background: #f0faf5; border-color: #c7e8d5; color: var(--success); }
.password-meter { display: grid; grid-template-columns: 76px 1fr; align-items: center; gap: 10px; margin-top: 9px; }
.password-meter > div { height: 3px; overflow: hidden; background: #e8e8e4; border-radius: 5px; }
.password-meter i { display: block; width: 0; height: 100%; background: var(--danger); transition: width .2s, background .2s; }
.password-meter span { color: #8c908c; font-size: 8px; line-height: 1.4; }

button:focus-visible, input:focus-visible, a:focus-visible { outline: 2px solid #373b38; outline-offset: 2px; }
.auth-field input:focus-visible { outline: 0; }
@keyframes status-in { from { opacity: 0; transform: translateY(-3px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; } }

@media (max-width: 560px) {
  .auth-shell { place-items: start center; padding: 74px 12px 24px; }
  .auth-brand { top: 23px; }
  .auth-card { border-radius: 15px; box-shadow: 0 15px 45px rgba(28, 29, 27, .06); }
  .auth-content { padding: 23px 18px 26px; }
  .field-pair { grid-template-columns: 1fr; gap: 0; }
  .auth-card h1 { font-size: 23px; }
}

/* Readability refinement */
:root{--text:#111312;--muted:#5e635f;--muted-2:#7d827e}
body{color:var(--text);font-weight:450}
button,input{font-weight:500}
.auth-brand{color:#111312;font-weight:800}
.auth-brand em{color:#5d625e;font-weight:700}
.auth-tabs button{color:#575d59;font-weight:650}
.auth-tabs button[aria-selected="true"]{font-weight:750}
.auth-card header p{color:#707571;font-weight:750}
.auth-card h1{color:#111312;font-weight:750}
.auth-field>span:first-child{color:#272a28;font-weight:700}
.auth-field input{color:#141615;font-weight:500}
.auth-field input::placeholder{color:#858a86}
.password-field button{color:#555b57;font-weight:700}
.text-button{color:#365a9b;font-weight:600}
.password-meter span{color:#6e7470;font-weight:500}
.form-status{font-weight:550}

/* Comfortable typography scale */
body{font-size:14px}
.auth-brand{font-size:17px}
.auth-tabs button{font-size:12px}
.auth-card header p{font-size:9px}.auth-card h1{font-size:27px}
.auth-field>span:first-child{font-size:11px}
.auth-field input{font-size:13px}
.password-field button{font-size:9px}
.text-button{font-size:10px}
.auth-submit{font-size:12px}
.field-error,.form-status{font-size:10px}
.password-meter span{font-size:9px}

/* Premium charcoal dark theme */
html[data-theme="dark"] body{background:#151719;color:#f0f1ef}
html[data-theme="dark"] .auth-brand{color:#f2f3f1}
html[data-theme="dark"] .auth-brand em{color:#a8aeaa}
html[data-theme="dark"] .auth-card{background:#222528;border-color:#383d42;box-shadow:0 24px 70px rgba(0,0,0,.28)}
html[data-theme="dark"] .auth-tabs{background:#191c1f;border-color:#34393e}
html[data-theme="dark"] .auth-tabs button{color:#a5aba9}
html[data-theme="dark"] .auth-tabs button[aria-selected="true"]{background:#f0efeb;color:#1c1e1d;box-shadow:none}
html[data-theme="dark"] .auth-card header p{color:#a2a8a5}
html[data-theme="dark"] .auth-card h1{color:#f1f2f0}
html[data-theme="dark"] .auth-field>span:first-child{color:#d4d8d5}
html[data-theme="dark"] .auth-field input{background:#191c1f;border-color:#3d4247;color:#f0f1ef}
html[data-theme="dark"] .auth-field input::placeholder{color:#8d9491}
html[data-theme="dark"] .auth-field input:hover{border-color:#555c60}
html[data-theme="dark"] .auth-field input:focus{background:#1c2023;border-color:#bdc2be;box-shadow:0 0 0 3px rgba(240,239,235,.09)}
html[data-theme="dark"] .password-field button{color:#c3c8c5}
html[data-theme="dark"] .text-button{color:#b5caff}
html[data-theme="dark"] .auth-submit{background:#f0efeb;border-color:#f0efeb;color:#1a1c1b}
html[data-theme="dark"] .auth-submit:hover{background:#fff;border-color:#fff;box-shadow:0 10px 28px rgba(0,0,0,.2)}
html[data-theme="dark"] .password-meter>div{background:#383d42}
html[data-theme="dark"] .password-meter span{color:#9ba19e}
html[data-theme="dark"] .form-status.ready{background:#18251e;border-color:#345b43;color:#9fe2b8}
html[data-theme="dark"] button:focus-visible,html[data-theme="dark"] input:focus-visible,html[data-theme="dark"] a:focus-visible{outline-color:#f0efeb}

/* Warm Tone Premium — dark auth theme */
html[data-theme="dark"] body{background:#171716;color:#f1eee7}
html[data-theme="dark"] .auth-brand{color:#f1eee7}
html[data-theme="dark"] .auth-brand em{color:#b8b4aa}
html[data-theme="dark"] .auth-card{background:#242321;border-color:#3a3834;box-shadow:0 24px 70px rgba(0,0,0,.34)}
html[data-theme="dark"] .auth-tabs{background:#1d1c1b;border-color:#3b3935}
html[data-theme="dark"] .auth-tabs button{color:#aaa79e}
html[data-theme="dark"] .auth-tabs button[aria-selected="true"]{background:#eeeae0;color:#1b1a18}
html[data-theme="dark"] .auth-card header p{color:#aaa79e}
html[data-theme="dark"] .auth-card h1{color:#f1eee7}
html[data-theme="dark"] .auth-field>span:first-child{color:#ddd9cf}
html[data-theme="dark"] .auth-field input{background:#1d1c1b;border-color:#4c4942;color:#f1eee7}
html[data-theme="dark"] .auth-field input::placeholder{color:#858178}
html[data-theme="dark"] .auth-field input:hover{border-color:#665f54}
html[data-theme="dark"] .auth-field input:focus{background:#252320;border-color:#817b6f;box-shadow:0 0 0 3px rgba(235,231,221,.09)}
html[data-theme="dark"] .password-field button{color:#c7c3b9}
html[data-theme="dark"] .text-button{color:#c4cfff}
html[data-theme="dark"] .auth-submit{background:#eeeae0;border-color:#eeeae0;color:#1b1a18}
html[data-theme="dark"] .auth-submit:hover{background:#fffdf8;border-color:#fffdf8;box-shadow:0 10px 28px rgba(0,0,0,.24)}
html[data-theme="dark"] .password-meter>div{background:#3a3834}
html[data-theme="dark"] .password-meter span{color:#aaa79e}
html[data-theme="dark"] .form-status.ready{background:#213128;border-color:#426451;color:#a7d9b8}
html[data-theme="dark"] .form-status.is-error{background:#2f1f23;border-color:#6a3842;color:#e89aa4}
html[data-theme="dark"] button:focus-visible,html[data-theme="dark"] input:focus-visible,html[data-theme="dark"] a:focus-visible{outline-color:#eeeae0}