/* =========================================================================
   auth.css — Senova auth (Login + Sign Up), Ink & Ivory. VISUAL v2:
   ONE centered axis over a full-bleed "Ember current" canvas.
   Layered on senova-ui.css tokens. Component behavior unchanged.
   ========================================================================= */

:root {
  /* Deeper than the site ivory (#FAF9F5) so the ember filaments and the white
     card both read (Rob asked twice for darker). MUST stay in sync with
     COLORS.ivory + CFG.FADE in auth-field.js, or the canvas trails won't
     dissolve into the ground cleanly. Contrast re-verified after each change. */
  --auth-ground: #EDE9DE;
}
body.auth {
  margin: 0;
  background:
    radial-gradient(60% 55% at 18% 22%, color-mix(in srgb, var(--sn-accent-soft) 25%, transparent), transparent 70%),
    radial-gradient(55% 50% at 85% 90%, color-mix(in srgb, var(--sn-accent-soft) 25%, transparent), transparent 72%),
    var(--auth-ground);
  color: var(--sn-ink);
}

/* ----------------------------------------------------------------------- *
 * THE DEFENSIVE CANVAS CONTRACT — the 43,000px bug, never again.
 * #auth-bg is position:fixed so its size IS the viewport; it can never be
 * influenced by its own contents, making a resize feedback loop structurally
 * impossible. These are the ONLY selectors in the codebase that may match
 * this canvas — never a bare `canvas {}` rule.
 * ----------------------------------------------------------------------- */
#auth-bg { position: fixed; inset: 0; z-index: 0; overflow: hidden; pointer-events: none; contain: strict; }
#auth-bg canvas {
  position: absolute; inset: 0; display: block;
  width: 100%; height: 100%; max-width: 100%; max-height: 100%;
  margin: 0; padding: 0; border: 0;
  opacity: 0; transition: opacity 240ms var(--sn-ease);
}
#auth-bg canvas.in { opacity: 1; }
/* grain — static paper texture, never animated */
#auth-bg::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 240px; opacity: .028; mix-blend-mode: multiply;
}
/* the clearing — quiets the field behind the centered card */
#auth-bg::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(min(78vw, 880px) min(90vh, 760px) at 50% 47%, rgb(237 233 222 / .58), transparent 72%);
}
@media (forced-colors: active) { #auth-bg { display: none; } }

/* ----------------------------------------------------------------------- *
 * ONE CENTERED AXIS
 * ----------------------------------------------------------------------- */
.auth-page { position: relative; z-index: 1; min-height: 100dvh; display: flex; flex-direction: column; align-items: center; padding: 0 24px; }
.auth-brand { margin-top: clamp(20px, 7vh, 72px); text-align: center; }
.wordmark { font-family: var(--sn-serif); font-weight: 600; font-size: 26px; line-height: 1; color: var(--sn-ink); text-decoration: none; }
.crumb { font-family: var(--sn-mono); font-weight: 400; font-size: 11px; letter-spacing: .14em; color: var(--sn-ink-3); vertical-align: 2px; margin-left: 8px; }
.tagline { margin: 18px auto 0; font-family: var(--sn-serif); font-weight: 600; font-size: clamp(28px, 2.2vw + 18px, 38px); line-height: 1.15; letter-spacing: -.015em; color: var(--sn-ink); text-wrap: balance; max-width: 22ch; }
.tagline em { font-style: italic; }
.subline { margin: 10px auto 0; font-size: 15px; line-height: 1.5; color: var(--sn-ink-2); max-width: 60ch; }
.auth-main { margin-top: 32px; width: 100%; display: flex; justify-content: center; }
.au-card { width: min(440px, 100%); background: var(--sn-surface); border: 1px solid var(--sn-hairline); border-radius: var(--sn-r-card); box-shadow: var(--sn-shadow); padding: 40px 36px; }
.auth-benefits { margin: 28px 0 0; padding: 0; list-style: none; display: flex; gap: 10px 28px; flex-wrap: wrap; justify-content: center; max-width: 880px; }
.auth-benefits li { display: flex; align-items: center; gap: 8px; font-size: 13.5px; line-height: 1.4; color: var(--sn-ink-2); }
.auth-benefits svg { color: var(--sn-accent-ink); flex: none; }
/* ink-2 not ink-3: on the deeper ground, ink-3 is only 3.1:1 (AA needs 4.5). */
.auth-footer { margin-top: auto; padding: 32px 0 24px; font-family: var(--sn-mono); font-size: 12px; color: var(--sn-ink-2); }
.auth-footer a { color: var(--sn-ink-2); }
.auth-footer a:hover { color: var(--sn-ink); }

/* ----------------------------------------------------------------------- *
 * CARD INTERNALS — behavior-identical to v1 (toggle, forms, meter, modal)
 * ----------------------------------------------------------------------- */
.au-toggle { display: grid; grid-template-columns: 1fr 1fr; position: relative; background: var(--sn-bg-raised); border-radius: var(--sn-r-pill); padding: 4px; margin-bottom: 26px; }
.au-toggle button { position: relative; z-index: 2; background: transparent; border: 0; font-family: var(--sn-sans); font-size: var(--sn-ui); font-weight: 600; color: var(--sn-ink-3); padding: 9px 0; cursor: pointer; border-radius: var(--sn-r-pill); transition: color var(--sn-micro) var(--sn-ease); }
.au-toggle button[aria-selected="true"] { color: var(--sn-bg); }
.au-toggle-thumb { position: absolute; z-index: 1; top: 4px; bottom: 4px; left: 4px; width: calc(50% - 4px); background: var(--sn-ink); border-radius: var(--sn-r-pill); transition: transform 180ms var(--sn-ease); }
.au-wrap[data-mode="signup"] .au-toggle-thumb { transform: translateX(100%); }

.au-h1 { font-family: var(--sn-serif); font-weight: 600; font-size: 1.75rem; letter-spacing: -.015em; color: var(--sn-ink); margin: 0 0 4px; }
.au-sub { font-size: var(--sn-ui); color: var(--sn-ink-2); margin: 0 0 22px; }

.au-social { margin-bottom: 20px; display: flex; flex-direction: column; gap: 10px; }
.au-oauth { display: flex; align-items: center; justify-content: center; gap: 9px; width: 100%; min-height: 42px; padding: 10px 16px; border: 1px solid var(--sn-hairline); border-radius: var(--sn-r-pill); background: var(--sn-surface); color: var(--sn-ink); font-family: var(--sn-sans); font-size: var(--sn-ui); font-weight: 500; cursor: pointer; text-decoration: none; transition: border-color var(--sn-micro) var(--sn-ease), background var(--sn-micro) var(--sn-ease); }
.au-oauth:hover { border-color: var(--sn-ink-3); background: var(--sn-bg-raised); }
/* display:flex above would beat the UA [hidden] rule — make hidden win, so an
   unconfigured provider never paints as a dead link. */
.au-oauth[hidden] { display: none !important; }
.au-gbtn { display: flex; justify-content: center; min-height: 40px; }
.au-divider { display: flex; align-items: center; gap: 12px; margin: 8px 0 0; color: var(--sn-ink-3); font-size: var(--sn-meta); }
.au-divider::before, .au-divider::after { content: ""; flex: 1; height: 1px; background: var(--sn-hairline); }

.au-panel { display: none; }
.au-panel.on { display: block; }
.au-field { margin-bottom: 16px; position: relative; }
.au-row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.au-label { display: block; font-size: var(--sn-meta); font-weight: 600; color: var(--sn-ink); margin: 0 0 6px; }
.au-input { width: 100%; font-family: var(--sn-sans); font-size: 16px; color: var(--sn-ink); background: var(--sn-surface); border: 1px solid var(--sn-hairline); border-radius: var(--sn-r-input); padding: 11px 13px; outline: none; transition: border-color var(--sn-micro) var(--sn-ease); }
.au-input::placeholder { color: var(--sn-ink-3); }
.au-input:focus-visible { border-color: var(--sn-ink); box-shadow: var(--sn-focus); }
.au-field.err .au-input { border-color: var(--sn-error); }
.au-field.ok .au-input { border-color: var(--sn-success); }
.au-msg { font-size: 12.5px; color: var(--sn-error); margin: 6px 0 0; }
.au-check { position: absolute; right: 12px; top: 34px; width: 16px; height: 16px; color: var(--sn-success); opacity: 0; transition: opacity var(--sn-micro) var(--sn-ease); pointer-events: none; }
.au-field.ok .au-check { opacity: 1; }
.au-pw-wrap { position: relative; }
.au-pw-toggle { position: absolute; right: 8px; top: 30px; background: transparent; border: 0; color: var(--sn-ink-3); font-size: 12px; cursor: pointer; padding: 4px 6px; }
.au-pw-toggle:hover { color: var(--sn-ink); }

.au-ws { font-size: 12.5px; color: var(--sn-ink-2); margin: -6px 0 16px; }
.au-ws b { color: var(--sn-ink); font-weight: 600; }
.au-ws button { background: transparent; border: 0; color: var(--sn-accent-ink); font: inherit; font-weight: 600; cursor: pointer; padding: 0; }

.au-meter { display: flex; gap: 4px; margin: 8px 0 4px; }
.au-meter i { flex: 1; height: 4px; border-radius: 2px; background: var(--sn-hairline); transition: background var(--sn-micro) var(--sn-ease); }
.au-meter-label { font-size: 12.5px; color: var(--sn-ink-3); text-align: right; margin: 0; }

.au-optrow { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin: 4px 0 20px; }
.au-check-lbl { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--sn-ink-2); cursor: pointer; }
.au-check-lbl input { accent-color: var(--sn-accent); width: 15px; height: 15px; }
.au-link { background: transparent; border: 0; color: var(--sn-ink-2); font: inherit; font-size: 13px; cursor: pointer; padding: 0; border-bottom: 1px solid var(--sn-hairline); }
.au-link:hover { color: var(--sn-ink); border-color: var(--sn-ink); }

.au-consent { display: flex; gap: 9px; align-items: flex-start; font-size: 13px; color: var(--sn-ink-2); margin: 4px 0 12px; line-height: 1.5; }
.au-consent input { accent-color: var(--sn-accent); width: 16px; height: 16px; margin-top: 2px; flex: none; }
.au-consent a { color: var(--sn-ink); border-bottom: 1px solid var(--sn-hairline); }

.au-submit { width: 100%; font-family: var(--sn-sans); font-weight: 600; font-size: var(--sn-body); color: #fff; background: var(--sn-accent); border: 0; border-radius: var(--sn-r-pill); padding: 13px 16px; cursor: pointer; transition: background var(--sn-micro) var(--sn-ease); }
.au-submit:hover { background: var(--sn-accent-ink); }
.au-submit:disabled { opacity: .5; cursor: default; }
.au-gate-hint { font-size: 12.5px; color: var(--sn-ink-3); text-align: center; margin: 8px 0 0; }

.au-banner { display: none; padding: 11px 14px; border-radius: var(--sn-r-input); background: color-mix(in srgb, var(--sn-error) 8%, var(--sn-surface)); border: 1px solid color-mix(in srgb, var(--sn-error) 30%, var(--sn-surface)); color: var(--sn-error); font-size: 13px; margin-bottom: 16px; }
.au-banner.on { display: block; }

.au-foot { margin-top: 22px; text-align: center; font-size: 13.5px; color: var(--sn-ink-2); }
.au-foot button { background: transparent; border: 0; color: var(--sn-accent-ink); font: inherit; font-weight: 600; cursor: pointer; padding: 0; }

@keyframes au-shake { 0%,100%{transform:translateX(0)} 20%,60%{transform:translateX(-3px)} 40%,80%{transform:translateX(3px)} }
.au-field.shake .au-input { animation: au-shake 320ms var(--sn-ease); }

.au-modal { border: 0; padding: 0; background: transparent; max-width: 420px; width: calc(100% - 32px); }
.au-modal::backdrop { background: rgb(20 19 19 / .40); }
.au-modal-card { background: var(--sn-surface); border: 1px solid var(--sn-hairline); border-radius: var(--sn-r-card); box-shadow: var(--sn-shadow-lg); padding: 28px 26px; }
.au-modal-card h2 { font-family: var(--sn-serif); font-weight: 600; font-size: 1.4rem; margin: 0 0 6px; color: var(--sn-ink); }
.au-modal-card p { font-size: var(--sn-ui); color: var(--sn-ink-2); margin: 0 0 16px; }
.au-modal-x { position: absolute; top: 14px; right: 16px; background: transparent; border: 0; font-size: 20px; color: var(--sn-ink-3); cursor: pointer; }

/* Motion hint — shown ONLY when motion is off (system setting or user choice),
   right under the tagline so it's impossible to miss. Hides itself once on. */
.motion-hint { display: inline-flex; align-items: center; gap: 8px; margin: 14px auto 0; padding: 6px 14px 6px 12px; border: 1px solid var(--sn-hairline); border-radius: var(--sn-r-pill); background: var(--sn-surface); font-size: 13px; color: var(--sn-ink-2); }
.motion-hint[hidden] { display: none !important; }
.motion-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--sn-accent); flex: none; }
.motion-hint button { background: transparent; border: 0; padding: 0; font: inherit; font-weight: 600; color: var(--sn-accent-ink); cursor: pointer; border-bottom: 1px solid currentColor; }
.motion-hint button:hover { color: var(--sn-ink); }

/* Motion toggle (footer) — subtle, mono, sits beside the legal line. */
.motion-toggle { background: transparent; border: 0; padding: 0; font: inherit; color: var(--sn-ink-2); cursor: pointer; border-bottom: 1px solid transparent; }
.motion-toggle:hover { color: var(--sn-ink); border-bottom-color: var(--sn-hairline); }

/* Respect the OS by default — but an explicit opt-in (data-motion="on", set by
   motion-pref.js) wins, so a reduced-motion visitor who asks for motion gets it. */
@media (prefers-reduced-motion: reduce) {
  html:not([data-motion="on"]) .au-toggle-thumb,
  html:not([data-motion="on"]) .au-field.shake .au-input,
  html:not([data-motion="on"]) .au-meter i,
  html:not([data-motion="on"]) .au-check,
  html:not([data-motion="on"]) .au-input,
  html:not([data-motion="on"]) #auth-bg canvas { transition: none; animation: none; }
}

/* ---- responsive tiers ---- */
@media (max-width: 1023px) { .auth-benefits { max-width: 560px; } }
@media (max-width: 767px) {
  .wordmark { font-size: 22px; }
  .tagline { font-size: clamp(26px, 7vw, 30px); }
  .subline, .auth-benefits { display: none; }
  .au-card { padding: 28px 20px; }
  .au-row2 { grid-template-columns: 1fr; }
  .auth-page { padding: 0 16px; }
}
@media (max-height: 760px) { .subline, .auth-benefits { display: none; } }