/* Authentication entry point, isolated from landing section layouts. */
html:has(.auth-dialog[open]) { overflow: hidden; }
.auth-dialog { width: min(640px, calc(100% - 32px)); max-width: none; max-height: calc(100dvh - 32px); margin: auto; padding: 0; border: 1px solid var(--color-border); border-radius: 24px; background: radial-gradient(ellipse at 100% 0, #edf3ff 0, transparent 50%), var(--color-surface); color: var(--color-navy); box-shadow: 0 24px 80px #142b541a; overflow-y: auto; }
.auth-content { padding: 32px 40px 22px; }
.auth-ad-area { border-top: 1px solid var(--color-border); background: var(--color-surface-soft); border-radius: 0 0 23px 23px; overflow: hidden; }
.auth-ad-label { display: block; color: var(--color-muted); font-size: 9px; line-height: 1.4; letter-spacing: .12em; text-transform: uppercase; text-align: center; }
.auth-ad-placeholder { display: grid; place-items: center; width: 100%; min-height: 114px; padding: 12px 20px; color: var(--color-muted); font-size: 12px; text-align: center; }
.auth-dialog::backdrop { background: rgb(255 255 255 / 78%); backdrop-filter: blur(6px); }
.auth-dialog[open] { animation: auth-dialog-in 320ms cubic-bezier(.16, 1, .3, 1) both; }
.auth-dialog[open]::backdrop { animation: auth-backdrop-in 320ms ease-out both; }
.auth-dialog.is-closing { animation: auth-dialog-out 220ms cubic-bezier(.4, 0, 1, 1) both; }
.auth-dialog.is-closing::backdrop { animation: auth-backdrop-out 220ms ease-in both; }
@keyframes auth-dialog-in {
  from { opacity: 0; transform: translateY(14px) scale(.975); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes auth-dialog-out {
  from { opacity: var(--auth-exit-opacity, 1); transform: var(--auth-exit-transform, none); }
  to { opacity: 0; transform: translateY(8px) scale(.985); }
}
@keyframes auth-backdrop-in { from { opacity: 0; } to { opacity: 1; } }
@keyframes auth-backdrop-out { from { opacity: var(--auth-backdrop-exit-opacity, 1); } to { opacity: 0; } }
.auth-close { position: absolute; top: 20px; right: 20px; display: grid; place-items: center; width: 36px; height: 36px; padding: 0; border: 1px solid var(--color-border); border-radius: 50%; background: var(--color-surface); color: var(--color-muted); cursor: pointer; }
.auth-close:hover { color: var(--color-navy); background: var(--color-surface-soft); }
.auth-close svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.6; }
.auth-brand { display: block; width: 120px; height: auto; margin: 0 0 20px; }
.auth-dialog h2 { margin: 0 0 12px; font-size: clamp(19px, 5.5vw, 36px); font-weight: 620; line-height: 1.15; letter-spacing: -.045em; white-space: nowrap; }
.auth-dialog h2 em { color: var(--color-primary); font-family: "Times New Roman", Times, serif; font-size: 1.12em; font-weight: 400; letter-spacing: -.035em; }
.auth-description { margin: 0 0 24px; color: var(--color-muted); font-size: 13px; line-height: 1.6; }
.auth-dialog h2, .auth-description { text-align: center; }
.auth-modes { display: flex; gap: 28px; margin-bottom: 24px; border-bottom: 1px solid var(--color-border); }
.auth-modes button { position: relative; min-height: 42px; padding: 0 0 12px; border: 0; background: transparent; color: var(--color-muted); font-size: 13px; cursor: pointer; }
.auth-modes button[aria-pressed="true"] { color: var(--color-navy); font-weight: 600; }
.auth-modes button[aria-pressed="true"]::after { content: ""; position: absolute; inset: auto 0 -1px; height: 2px; background: var(--color-primary); }
.auth-dialog form { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); column-gap: 16px; row-gap: 18px; }
.auth-dialog form > * { grid-column: 1 / -1; }
.auth-dialog[data-mode="signup"] .auth-name, .auth-dialog[data-mode="signup"] .auth-email { grid-column: auto; }
.auth-field { display: grid; gap: 8px; font-size: 12px; font-weight: 550; }
.auth-field[hidden] { display: none; }
.auth-confirm { display: grid; grid-template-rows: 1fr; }
.auth-confirm[hidden] { display: none; }
.auth-confirm > .auth-field { min-height: 0; overflow: hidden; }
.auth-confirm:not([hidden]) { animation: auth-confirm-in 320ms cubic-bezier(.22, 1, .36, 1) both; }
@keyframes auth-confirm-in {
  from { grid-template-rows: 0fr; margin-top: -18px; opacity: 0; }
  to { grid-template-rows: 1fr; margin-top: 0; opacity: 1; }
}
.auth-field input { width: 100%; min-width: 0; height: 48px; padding: 0 14px; border: 1px solid var(--color-border); border-radius: 10px; background: var(--color-surface); color: var(--color-navy); font-size: 13px; font-weight: 400; transition: border-color var(--duration-fast); }
.auth-field input::placeholder { color: var(--color-muted); opacity: 1; }
.auth-field input:focus { border-color: #8a8a8a; outline: none; }
.auth-submit { position: relative; width: 100%; min-height: 48px; margin-top: 6px; cursor: pointer; font-weight: 550; }
.auth-submit::after { content: "\2192"; position: absolute; right: 22px; font-size: 20px; font-weight: 400; }
.auth-status { margin: 20px 0 0; color: var(--color-muted); font-size: 11px; line-height: 1.6; text-align: center; }
.auth-status { margin: 0; color: var(--color-navy); }
@media (max-width: 1000px) {
  .auth-close { width: 44px; height: 44px; top: 12px; right: 12px; }
  .auth-modes button { min-height: 44px; font-size: 14px; }
  .auth-field input { font-size: 16px; }
}
@media (max-width: 700px) {
  .auth-dialog { width: min(640px, calc(100% - var(--landing-mobile-gutter) * 2)); padding: 0; border-radius: 20px; }
  .auth-content { padding: 28px 20px 20px; }
  .auth-ad-area { border-radius: 0 0 19px 19px; }
  .auth-ad-placeholder { min-height: 74px; font-size: 11px; }
  .auth-dialog h2 { font-size: clamp(24px, 6vw, 32px); white-space: normal; text-wrap: balance; }
  .auth-brand { margin-bottom: 24px; }
  .auth-dialog[data-mode="signup"] .auth-name, .auth-dialog[data-mode="signup"] .auth-email { grid-column: 1 / -1; }
}
@media (prefers-reduced-motion: reduce) {
  .auth-field input { transition: none; }
  .auth-confirm:not([hidden]) { animation: none; }
  .auth-dialog[open], .auth-dialog[open]::backdrop { animation: none; }
}

.auth-links { display: flex; flex-wrap: wrap; gap: 12px 20px; justify-content: space-between; }
.auth-links button { border: 0; padding: 4px 0; font: inherit; font-size: 12px; color: var(--color-primary); background: transparent; cursor: pointer; }
.auth-demo-link { font-size: 12px; color: var(--color-muted); text-align: center; }
.auth-submit:disabled { opacity: .6; cursor: wait; }

.auth-google { display:flex;align-items:center;justify-content:center;gap:12px;width:100%;min-height:48px;padding:10px 18px;border:1px solid var(--color-border);border-radius:10px;background:var(--color-surface);color:var(--color-navy);font:inherit;font-size:13px;font-weight:550;cursor:pointer; }
.auth-google span {font-size:20px;font-weight:650;color:#4285f4;}
.auth-google:disabled{opacity:.55;cursor:not-allowed;}
.auth-divider{display:flex;align-items:center;gap:14px;margin:22px 0;color:var(--color-muted);font-size:11px;}
.auth-divider::before,.auth-divider::after{content:"";height:1px;background:var(--color-border);flex:1;}
.account-security-challenge {grid-column:1/-1;display:flex;justify-content:center;max-width:100%;margin:8px 0;}