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

:root {
  --bg-0: #070b16;
  --card-bg: rgba(255, 255, 255, 0.05);
  --card-border: rgba(255, 255, 255, 0.1);
  --text-1: #f4f7fb;
  --text-2: #98a3b8;
  --accent-a: #6366f1;
  --accent-b: #22d3ee;
  --error: #fb7185;
  --success: #34d399;
  --field-bg: rgba(255, 255, 255, 0.06);
  --field-border: rgba(255, 255, 255, 0.14);
  --field-focus: rgba(99, 102, 241, 0.7);
}

html, body { height: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg-0);
  color: var(--text-1);
  display: grid;
  place-items: center;
  min-height: 100vh;
  overflow: hidden;
  position: relative;
}

/* ---------- ambient background ---------- */
.glow { position: fixed; border-radius: 50%; filter: blur(90px); opacity: .45; pointer-events: none; }
.glow-1 { width: 480px; height: 480px; background: #4338ca; top: -120px; left: -80px; animation: drift 14s ease-in-out infinite alternate; }
.glow-2 { width: 420px; height: 420px; background: #0e7490; bottom: -140px; right: -60px; animation: drift 18s ease-in-out infinite alternate-reverse; }
@keyframes drift { from { transform: translate(0,0) scale(1); } to { transform: translate(60px,40px) scale(1.15); } }

/* ---------- card ---------- */
.card {
  position: relative;
  width: min(420px, calc(100vw - 32px));
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 24px;
  padding: 36px 34px 30px;
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  box-shadow: 0 30px 80px rgba(0, 0, 0, .45);
}

.brand { display: flex; align-items: center; gap: 10px; margin-bottom: 28px; }
.brand .logo {
  width: 34px; height: 34px; border-radius: 10px;
  background: linear-gradient(135deg, var(--accent-a), var(--accent-b));
  display: grid; place-items: center;
  box-shadow: 0 6px 18px rgba(79, 70, 229, .4);
  flex: none;
}
.brand span { font-size: 16px; font-weight: 700; letter-spacing: .3px; }

/* ---------- panels ---------- */
.panel { display: none; }
.panel.active { display: block; animation: rise .35s cubic-bezier(.2,.8,.2,1); }
@keyframes rise { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

h1 { font-size: 26px; font-weight: 700; letter-spacing: -.3px; margin-bottom: 8px; }
.sub { color: var(--text-2); font-size: 14.5px; line-height: 1.55; margin-bottom: 24px; }
.sub strong { color: var(--text-1); font-weight: 600; }
.sub-tight { margin-bottom: 0; }

/* ---------- email field ---------- */
.field { position: relative; margin-bottom: 18px; }
.field svg.icon {
  position: absolute; left: 15px; top: 50%; transform: translateY(-50%);
  width: 18px; height: 18px; color: var(--text-2); pointer-events: none;
}
.field input {
  width: 100%; padding: 14px 16px 14px 44px;
  background: var(--field-bg); border: 1px solid var(--field-border);
  border-radius: 14px; color: var(--text-1); font-size: 15px;
  outline: none; transition: border-color .2s, box-shadow .2s;
}
.field input::placeholder { color: #5b6579; }
.field input:focus { border-color: var(--field-focus); box-shadow: 0 0 0 3px rgba(99,102,241,.22); }
.field.invalid input { border-color: var(--error); box-shadow: 0 0 0 3px rgba(251,113,133,.18); }

/* ---------- buttons ---------- */
.btn-primary {
  width: 100%; display: flex; align-items: center; justify-content: center; gap: 10px;
  padding: 14px 18px; border-radius: 14px; border: none;
  background: linear-gradient(135deg, var(--accent-a), var(--accent-b));
  color: #fff; font-size: 15px; font-weight: 600; cursor: pointer;
  box-shadow: 0 10px 30px rgba(79, 70, 229, .35);
  transition: transform .15s, box-shadow .2s, filter .2s;
}
.btn-primary:hover:not([disabled]) { filter: brightness(1.08); transform: translateY(-1px); }
.btn-primary:active:not([disabled]) { transform: translateY(0); }
.btn-primary[disabled] { opacity: .75; cursor: default; }

.spinner {
  width: 16px; height: 16px; border-radius: 50%; flex: none;
  border: 2px solid rgba(255,255,255,.35); border-top-color: #fff;
  animation: spin .7s linear infinite; display: none;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading .spinner { display: inline-block; }

.fineprint { margin-top: 16px; text-align: center; color: #5b6579; font-size: 12.5px; }

/* ---------- code step ---------- */
.back {
  display: inline-flex; align-items: center; gap: 6px;
  background: none; border: none; color: var(--text-2); font-size: 13px;
  cursor: pointer; margin-bottom: 18px; padding: 0; transition: color .2s;
}
.back:hover { color: var(--text-1); }

.digits { display: flex; gap: 10px; justify-content: center; margin-bottom: 6px; }
.digit {
  width: clamp(42px, 13vw, 56px); height: clamp(54px, 16vw, 68px);
  text-align: center; font-size: 26px; font-weight: 700;
  font-variant-numeric: tabular-nums;
  background: var(--field-bg); border: 1px solid var(--field-border);
  border-radius: 14px; color: var(--text-1); outline: none;
  transition: border-color .2s, box-shadow .2s, opacity .2s;
}
.digit:focus { border-color: var(--field-focus); box-shadow: 0 0 0 3px rgba(99,102,241,.25); }
.digit:disabled { opacity: .55; }

@keyframes shake {
  10%, 90% { transform: translateX(-2px); }
  20%, 80% { transform: translateX(4px); }
  30%, 50%, 70% { transform: translateX(-6px); }
  40%, 60% { transform: translateX(6px); }
}
.shake { animation: shake .45s; }

.status { min-height: 22px; text-align: center; font-size: 13.5px; margin-bottom: 14px; display: flex; align-items: center; justify-content: center; gap: 8px; }
.status.error { color: var(--error); }
.status.loading { color: var(--text-2); }

.resend-row { text-align: center; color: var(--text-2); font-size: 13.5px; }
.resend-row button {
  background: none; border: none; padding: 0; cursor: pointer;
  color: #a5b4fc; font-size: 13.5px; font-weight: 600; text-decoration: underline;
  text-underline-offset: 3px; transition: color .2s;
}
.resend-row button:hover:not([disabled]) { color: #c7d2fe; }
.resend-row button[disabled] { color: #5b6579; cursor: default; text-decoration: none; }

/* ---------- success ---------- */
.success-wrap { display: flex; flex-direction: column; align-items: center; text-align: center; padding: 12px 0 4px; }
.check { width: 76px; height: 76px; margin-bottom: 20px; }
.check circle { stroke-dasharray: 189; stroke-dashoffset: 189; animation: draw .6s ease forwards .1s; }
.check path { stroke-dasharray: 42; stroke-dashoffset: 42; animation: draw .35s ease forwards .7s; }
@keyframes draw { to { stroke-dashoffset: 0; } }

/* ---------- toast (demo helper) ---------- */
.toast {
  position: fixed; bottom: 28px; left: 50%; transform: translate(-50%, 16px);
  background: #111827; border: 1px solid rgba(255,255,255,.14);
  color: var(--text-1); font-size: 13.5px; padding: 12px 18px; border-radius: 999px;
  box-shadow: 0 16px 40px rgba(0,0,0,.5);
  opacity: 0; pointer-events: none; transition: opacity .3s, transform .3s;
  display: flex; align-items: center; gap: 8px; z-index: 10;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 15px; letter-spacing: 3px; color: #a5b4fc; font-weight: 700; }