:root {
  --ink: #101113;
  --paper: #fafaf8;
  --surface: #ffffff;
  --slate: #6b6f76;
  --line: #dedcd5;
  --flare: #ff4f30;
  --ember: #c9361b;
  --mist: #ffe9e4;
  --sans: "IBM Plex Sans", system-ui, sans-serif;
  --display: "DM Sans", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }
body { margin: 0; min-width: 320px; color: var(--ink); background: var(--paper); font-family: var(--sans); }
.sign-in-shell { width: min(100%, 760px); min-height: 100vh; margin: 0 auto; padding: 24px; display: grid; grid-template-rows: auto 1fr auto; }
.brand-bar { display: flex; align-items: center; gap: 14px; min-height: 40px; color: var(--ink); }
.brand-bar .wordmark { flex: 0 0 auto; }
.brand-bar span, .eyebrow, footer { font: 600 10px/1.2 var(--mono); letter-spacing: .1em; text-transform: uppercase; }
.brand-bar span { color: var(--slate); border-left: 1px solid var(--line); padding-left: 14px; }
.sign-in-panel { position: relative; align-self: center; max-width: 480px; padding: 64px 0 72px; }
.signal { width: 40px; height: 40px; display: grid; place-items: center; margin-bottom: 28px; border: 1px solid var(--flare); border-radius: 50%; }
.signal span { width: 12px; height: 12px; background: var(--flare); border-radius: 50%; transform: translateY(-5px); }
.eyebrow { margin: 0 0 20px; color: var(--ember); }
h1 { max-width: 440px; margin: 0; font: 600 clamp(38px, 6vw, 56px)/.98 var(--display); letter-spacing: -.055em; }
.intro { max-width: 430px; margin: 20px 0 34px; color: var(--slate); font-size: 16px; line-height: 1.55; }
form { display: grid; gap: 10px; max-width: 400px; }
label { font: 600 11px/1.2 var(--mono); letter-spacing: .08em; text-transform: uppercase; }
input { min-height: 48px; width: 100%; padding: 0 14px; border: 1px solid var(--line); border-radius: 8px; color: var(--ink); background: var(--surface); outline: none; font: 500 16px/1 var(--sans); transition: border-color 120ms ease, box-shadow 120ms ease; }
input:focus { border-color: var(--ember); box-shadow: 0 0 0 3px var(--mist); }
#code { font-family: var(--mono); letter-spacing: .18em; }
button { min-height: 48px; margin-top: 6px; border: 1px solid var(--ember); border-radius: 8px; padding: 0 16px; color: #fff; background: var(--ember); font: 600 15px/1 var(--sans); cursor: pointer; transition: filter 120ms ease, opacity 120ms ease; }
button:hover { filter: brightness(.94); }
button:disabled { cursor: wait; opacity: .58; }
.text-action { width: max-content; min-height: auto; margin: 8px 0 0; padding: 0; border: 0; border-radius: 0; color: var(--slate); background: transparent; font: 500 13px/1.3 var(--sans); }
.text-action:hover { color: var(--ink); filter: none; }
.sent-to { margin: 0 0 10px; color: var(--slate); font-size: 14px; }
.sent-to strong { color: var(--ink); }
.message { min-height: 20px; max-width: 420px; margin: 18px 0 0; color: var(--ember); font-size: 14px; line-height: 1.45; }
.message[data-kind="success"] { color: #1f8a4c; }
footer { align-self: end; padding: 20px 0 4px; color: var(--slate); border-top: 1px solid var(--line); }
footer strong { color: var(--ink); font-weight: 600; }
@media (max-width: 520px) { .sign-in-shell { padding: 18px; } .sign-in-panel { padding: 48px 0; } h1 { font-size: 40px; } }