:root {
  --hc-indigo: #6366F1;
  --hc-indigo-700: #4338CA;
  --hc-indigo-400: #818CF8;
  --hc-indigo-300: #A5B4FC;
  --hc-ink: #1E1B4B;
  --hc-mist: #F8FAFC;
  --hc-paper: #FFFFFF;
  --hc-night: #0B1020;
  --radius: 16px;
  --maxw: 1080px;
  --font: "Sora", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

:root[data-theme="dark"] {
  --bg: var(--hc-night);
  --bg-soft: #10162A;
  --surface: #131A31;
  --surface-2: #171F3B;
  --text: var(--hc-mist);
  --text-soft: #C7D0F5;
  --muted: var(--hc-indigo-300);
  --border: rgba(129, 140, 248, 0.18);
  --primary: var(--hc-indigo-400);
  --primary-text: var(--hc-night);
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
  color-scheme: dark;
}

:root[data-theme="light"] {
  --bg: var(--hc-mist);
  --bg-soft: #EEF1FB;
  --surface: var(--hc-paper);
  --surface-2: #F3F5FE;
  --text: var(--hc-ink);
  --text-soft: #3B3A63;
  --muted: var(--hc-indigo-700);
  --border: rgba(30, 27, 75, 0.12);
  --primary: var(--hc-indigo-700);
  --primary-text: var(--hc-paper);
  --shadow: 0 20px 50px rgba(30, 27, 75, 0.12);
  color-scheme: light;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font);
  background:
    radial-gradient(1100px 520px at 82% -12%, rgba(99, 102, 241, 0.22), transparent 60%),
    radial-gradient(900px 480px at 6% 8%, rgba(129, 140, 248, 0.14), transparent 55%),
    var(--bg);
  color: var(--text);
  line-height: 1.55;
  min-height: 100vh;
}

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

.skip {
  position: absolute; left: -999px; top: 0;
  background: var(--primary); color: var(--primary-text);
  padding: 10px 14px; border-radius: 0 0 10px 0; font-weight: 700;
}
.skip:focus { left: 0; z-index: 50; }

.preview-bar {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  padding: 10px 20px;
  background: linear-gradient(90deg, var(--hc-indigo-700), var(--hc-indigo));
  color: #fff;
  font-size: 0.9rem;
}
.preview-bar .dot {
  width: 9px; height: 9px; border-radius: 50%;
  background: #FDE68A; box-shadow: 0 0 0 4px rgba(253, 230, 138, 0.25);
  flex: none;
}
.preview-bar strong { letter-spacing: 0.02em; }
.preview-note { opacity: 0.92; }

.site-header { padding: 18px 0 6px; }
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.brand { display: inline-flex; align-items: center; }
.logo { height: 30px; width: auto; display: block; }
.logo-light { display: none; }
:root[data-theme="light"] .logo-dark { display: none; }
:root[data-theme="light"] .logo-light { display: block; }

.theme-toggle {
  display: inline-flex; align-items: center; gap: 8px;
  font: inherit; font-size: 0.85rem; font-weight: 600;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 14px;
  cursor: pointer;
}
.theme-toggle:hover { border-color: var(--primary); }
.theme-icon { color: var(--primary); }

.hero { padding: 44px 20px 8px; text-align: center; }
.eyebrow {
  text-transform: uppercase; letter-spacing: 0.16em;
  font-size: 0.72rem; font-weight: 700; color: var(--muted); margin: 0 0 12px;
}
.hero h1 {
  font-size: clamp(1.85rem, 4.4vw, 3rem);
  line-height: 1.1; margin: 0 auto 16px; max-width: 760px;
  letter-spacing: -0.02em;
}
.lede { max-width: 620px; margin: 0 auto; color: var(--text-soft); font-size: 1.05rem; }
.lede strong { color: var(--text); }

.auth-layout {
  display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 28px; align-items: start;
  padding-top: 36px; padding-bottom: 40px;
}

.auth-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
}

.tabs {
  display: grid; grid-template-columns: 1fr 1fr; gap: 6px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 5px;
  margin-bottom: 20px;
}
.tab {
  font: inherit; font-weight: 600; font-size: 0.92rem;
  color: var(--text-soft);
  background: transparent; border: 0; border-radius: 9px;
  padding: 10px 8px; cursor: pointer;
}
.tab.is-active { background: var(--primary); color: var(--primary-text); }

.panel { display: grid; gap: 8px; }
.panel[hidden] { display: none; }
.panel-title { margin: 0 0 6px; font-size: 1.2rem; }

label { font-size: 0.85rem; font-weight: 600; color: var(--text-soft); margin-top: 6px; }
input {
  font: inherit;
  color: var(--text);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  width: 100%;
}
input::placeholder { color: var(--muted); opacity: 0.7; }
input:focus { outline: 2px solid var(--primary); outline-offset: 1px; border-color: transparent; }

.hint { font-size: 0.8rem; color: var(--text-soft); margin: 2px 0 6px; opacity: 0.9; }

.btn {
  font: inherit; font-weight: 700; font-size: 1rem;
  color: var(--primary-text);
  background: var(--primary);
  border: 0; border-radius: 11px;
  padding: 13px 16px;
  margin-top: 10px; cursor: pointer;
  transition: transform 0.06s ease, filter 0.15s ease;
}
.btn:hover { filter: brightness(1.06); }
.btn:active { transform: translateY(1px); }

.form-note {
  margin: 10px 0 0; padding: 10px 12px;
  background: var(--surface-2);
  border: 1px dashed var(--border);
  border-radius: 10px;
  font-size: 0.85rem; color: var(--muted);
}

.fineprint { margin: 18px 0 0; font-size: 0.78rem; color: var(--text-soft); opacity: 0.85; }

.explain {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
.explain h2 { margin: 0 0 12px; font-size: 1.15rem; }
.explain ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.explain li { padding-left: 26px; position: relative; color: var(--text-soft); font-size: 0.95rem; }
.explain li::before {
  content: ""; position: absolute; left: 0; top: 0.35em;
  width: 14px; height: 14px; border-radius: 4px;
  background: var(--primary);
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.16);
}
.explain strong { color: var(--text); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.chip {
  font-size: 0.75rem; font-weight: 600;
  color: var(--muted);
  border: 1px solid var(--border);
  background: var(--surface-2);
  border-radius: 999px; padding: 5px 11px;
}

.site-footer { border-top: 1px solid var(--border); margin-top: 8px; }
.footer-inner { display: flex; align-items: center; gap: 12px; padding: 20px; color: var(--text-soft); font-size: 0.85rem; }
.footer-inner p { margin: 0; }
.footer-mark { color: var(--muted); flex: none; }
.muted { color: var(--muted); }

@media (max-width: 820px) {
  .auth-layout { grid-template-columns: 1fr; }
  .hero { padding-top: 32px; }
}