/* =============================================================
   Auth flow — login / register / forgot password
   Built on the shared tokens in styles.css. Pure HTML/CSS:
   - screens switch via :target (no JS)
   - SSO is a config section toggled by a class/checkbox; providers
     are a <ul> you extend by adding one <li class="sso-item">.
   ============================================================= */

.auth-stage {
  min-height: 100dvh;
  display: grid; place-items: center;
  padding: 40px 20px 96px;
  background: var(--bg);
}
.auth {
  width: 100%; max-width: 408px;
  display: flex; flex-direction: column; gap: 22px;
}

/* brand */
.auth-brand {
  display: flex; align-items: center; justify-content: center; gap: 10px;
}
.auth-brand .brand-name { font-size: 16px; }

/* ---- screen switching via :target (login is the default) ---- */
.auth-view { display: none; }
#login { display: block; }
#register:target, #forgot:target { display: block; }
body:has(#register:target) #login,
body:has(#forgot:target) #login { display: none; }

/* card */
.auth-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 3px);
  padding: 24px;
  display: flex; flex-direction: column; gap: 16px;
  box-shadow: 0 1px 2px rgba(0,0,0,.04), 0 10px 30px rgba(0,0,0,.06);
}
.auth-head { display: flex; flex-direction: column; gap: 4px; }
.auth-head h1 { margin: 0; font-size: 19px; font-weight: 650; letter-spacing: -.01em; }
.auth-sub { margin: 0; color: var(--text-muted); font-size: var(--fz); }
.auth-back {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: var(--fz-sm); color: var(--text-muted); width: fit-content;
  margin-bottom: 2px;
}
.auth-back:hover { color: var(--text); }

/* ---- SSO section (rendered server-side only when providers are configured) ---- */
.sso { display: flex; flex-direction: column; gap: 10px; }

.sso-list { display: flex; flex-direction: column; gap: 8px; }
.sso-btn {
  display: flex; align-items: center; gap: 11px; width: 100%;
  height: 40px; padding: 0 12px;
  background: var(--surface); color: var(--text);
  border: 1px solid var(--border-2); border-radius: var(--radius);
  font: inherit; font-size: var(--fz-sm); font-weight: 550;
  cursor: pointer; text-align: left;
}
.sso-btn:hover { background: var(--surface-2); }
/* logo slot — swap the initial for an <img class="sso-logo"> later */
.sso-logo {
  width: 22px; height: 22px; flex: 0 0 auto;
  display: grid; place-items: center; border-radius: 5px;
  background: var(--surface-2); border: 1px solid var(--border);
  color: var(--text-muted); font-size: 11px; font-weight: 700;
}
.sso-logo .ico { color: var(--text-muted); }
.sso-btn .sso-label { flex: 1 1 auto; }

/* divider */
.auth-divider {
  display: flex; align-items: center; gap: 12px;
  color: var(--text-faint); font-size: var(--fz-xs);
  text-transform: uppercase; letter-spacing: .07em;
}
.auth-divider::before, .auth-divider::after {
  content: ""; flex: 1 1 auto; height: 1px; background: var(--border);
}

/* ---- form fields ---- */
.auth-form { display: flex; flex-direction: column; gap: 14px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field-top { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; }
.field label { font-size: var(--fz-sm); font-weight: 550; color: var(--text); }
.field .optional { font-size: var(--fz-xs); color: var(--text-faint); font-weight: 400; }
.field-link { font-size: var(--fz-xs); color: var(--accent); }
.field-link:hover { text-decoration: underline; }

.input-wrap { position: relative; display: flex; }
.input-ico {
  position: absolute; left: 11px; top: 50%; transform: translateY(-50%);
  color: var(--text-faint); pointer-events: none;
}
.input {
  width: 100%; height: 40px; padding: 0 12px;
  background: var(--surface-3); color: var(--text);
  border: 1px solid var(--border-2); border-radius: var(--radius);
  font: inherit; font-size: var(--fz);
}
.input.has-ico { padding-left: 36px; }
.input::placeholder { color: var(--text-faint); }
.input:focus { outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-bg); }
/* gentle validation feedback only after the user has interacted */
.input:user-invalid { border-color: var(--neg); }
.input:user-invalid:focus { box-shadow: 0 0 0 2px var(--neg-bg); }

.field-hint { font-size: var(--fz-xs); color: var(--text-faint); }

.remember { margin-top: 2px; }

/* full-width primary button (extends .btn / .btn-primary from styles.css) */
.btn-block { width: 100%; justify-content: center; height: 40px; font-size: var(--fz); }

/* alternate action line */
.auth-alt { margin: 0; text-align: center; font-size: var(--fz-sm); color: var(--text-muted); }
.auth-alt a { color: var(--accent); font-weight: 550; }
.auth-alt a:hover { text-decoration: underline; }

/* legal footnote */
.auth-foot { margin: 0; text-align: center; font-size: var(--fz-xs); color: var(--text-faint); }
.auth-foot a { color: var(--text-muted); text-decoration: underline; }

/* =============================================================
   Template preview controls (delete this block + its markup for
   production). Drives theme + SSO on/off with zero JS.
   ============================================================= */
.tpl-controls {
  position: fixed; bottom: 16px; left: 50%; transform: translateX(-50%);
  z-index: 50;
  display: flex; align-items: center; gap: 12px;
  padding: 6px 8px 6px 14px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 99px; box-shadow: 0 6px 22px rgba(0,0,0,.12);
}
.tpl-label { font-size: var(--fz-xs); color: var(--text-faint);
  text-transform: uppercase; letter-spacing: .05em; font-weight: 600; }
.tpl-sep { width: 1px; height: 20px; background: var(--border); }
.tpl-controls .theme-switch { width: 156px; }

/* on/off switch */
.tpl-toggle { display: inline-flex; align-items: center; gap: 8px;
  font-size: var(--fz-sm); color: var(--text-muted); cursor: pointer; }
.tpl-toggle input { position: absolute; opacity: 0; width: 0; height: 0; }
.tpl-track { width: 32px; height: 18px; border-radius: 99px;
  background: var(--border-2); position: relative; transition: background .15s ease; }
.tpl-track::after { content: ""; position: absolute; top: 2px; left: 2px;
  width: 14px; height: 14px; border-radius: 50%; background: #fff;
  box-shadow: 0 1px 2px rgba(0,0,0,.3); transition: transform .15s ease; }
.tpl-toggle:has(input:checked) .tpl-track { background: var(--accent); }
.tpl-toggle:has(input:checked) .tpl-track::after { transform: translateX(14px); }
.tpl-toggle:has(input:focus-visible) .tpl-track {
  outline: 2px solid var(--focus); outline-offset: 2px; }

@media (max-width: 520px) {
  .tpl-label { display: none; }
  .tpl-controls { gap: 10px; padding: 6px 10px; }
}

/* =============================================================
   Forgot-password feedback (Post/Redirect/Get, no JS).
   The form POSTs to its own URL; on the redirect-GET the server
   re-renders #forgot with a state class so the matching alert shows:
     <section id="forgot" class="auth-view state-sent"> … </section>
   (state-sent | state-error). No extra view is added.
   The preview radios below demonstrate the same states live.
   ============================================================= */
.forgot-alert { display: none; }
#forgot.state-sent  .forgot-alert.is-sent,
body:has(#fstate-sent:checked)  #forgot .forgot-alert.is-sent  { display: flex; }
#forgot.state-error .forgot-alert.is-error,
body:has(#fstate-error:checked) #forgot .forgot-alert.is-error { display: flex; }

/* the Forgot-state control only appears while the forgot view is open */
.tpl-forgot { display: none; }
body:has(#forgot:target) .tpl-forgot { display: flex; }
.tpl-controls .segmented { padding: 1px; }
.tpl-controls .segmented label { padding: 3px 8px; }

/* =============================================================
   Field-level errors (e.g. "email already used"), server-driven.
   The server re-renders the field's form with a state class and
   adds aria-invalid="true" to the input:
     <section id="register" class="auth-view state-email-taken"> … </section>
   Reusable: drop a <p class="field-error"> under any field and gate
   it on whatever state your server sets.
   ============================================================= */
.field-error {
  display: none; align-items: center; gap: 6px; margin: 0;
  font-size: var(--fz-xs); color: var(--neg);
}
.field.has-error .field-error { display: flex; }  /* server-rendered field shows its own error */
.field-error > .ico { flex: 0 0 auto; color: var(--neg); }
.field-error a { color: var(--neg); font-weight: 600; text-decoration: underline; }

/* register form-level error banner (pairs with field-level errors) */
.register-alert { display: none; }

/* --- state A: email already taken — field-level error only --- */
#register.state-email-taken .err-email,
body:has(#rstate-taken:checked) #register .err-email { display: flex; }
#register.state-email-taken #reg-email,
body:has(#rstate-taken:checked) #register #reg-email { border-color: var(--neg); }

/* --- state B: multiple errors — banner + several field errors together --- */
#register.state-invalid .register-alert,
body:has(#rstate-combined:checked) #register .register-alert { display: flex; }
#register.state-invalid .err-email,
#register.state-invalid .err-password,
body:has(#rstate-combined:checked) #register .err-email,
body:has(#rstate-combined:checked) #register .err-password { display: flex; }
#register.state-invalid #reg-email,
#register.state-invalid #reg-password,
body:has(#rstate-combined:checked) #register #reg-email,
body:has(#rstate-combined:checked) #register #reg-password { border-color: var(--neg); }

/* red focus ring on any invalid register input */
#register.state-email-taken #reg-email:focus,
#register.state-invalid #reg-email:focus,
#register.state-invalid #reg-password:focus,
body:has(#rstate-taken:checked) #register #reg-email:focus,
body:has(#rstate-combined:checked) #register #reg-email:focus,
body:has(#rstate-combined:checked) #register #reg-password:focus { box-shadow: 0 0 0 2px var(--neg-bg); }

/* the Register-state control only appears while the register view is open */
.tpl-register { display: none; }
body:has(#register:target) .tpl-register { display: flex; }