/* Login page — standalone pre-auth view.
 * Uses tokens from /static/css/tokens.css (default --hue: 295 violet).
 * Layout: single centered translucent card on an ambient purple aurora. */

body {
  margin: 0;
  min-height: 100dvh;
  font-family: var(--font-ui);
  color: var(--ink);
  background: oklch(0.08 0.022 var(--hue));
  display: grid;
  place-items: center;
  padding: 24px;
  position: relative;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Ambient gradient background — two soft purple radial glows on a deep base.
 * Static, no animation per user preference. */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(60% 50% at 18% 22%, oklch(0.50 0.22 var(--hue) / 0.55), transparent 65%),
    radial-gradient(55% 50% at 82% 78%, oklch(0.38 0.22 calc(var(--hue) + 10) / 0.48), transparent 65%),
    radial-gradient(40% 40% at 50% 50%, oklch(0.31 0.11 var(--hue) / 0.28), transparent 70%),
    linear-gradient(180deg, oklch(0.08 0.022 var(--hue)), oklch(0.04 0.02 var(--hue)));
  z-index: 0;
  pointer-events: none;
}

/* Card */
.login-card {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 380px;
  padding: 36px 30px 28px;
  background: oklch(0.22 0.020 var(--hue) / 0.55);
  backdrop-filter: blur(28px) saturate(140%);
  -webkit-backdrop-filter: blur(28px) saturate(140%);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-3);
  box-shadow:
    0 24px 72px -20px oklch(0 0 0 / 0.75),
    inset 0 1px 0 oklch(1 0 0 / 0.08);
}
/* Subtle top sheen so the translucent panel reads as "lit" */
.login-card::before {
  content: '';
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, oklch(1 0 0 / 0.22), transparent);
  border-top-left-radius: var(--r-3);
  border-top-right-radius: var(--r-3);
  pointer-events: none;
}

/* Brand */
.login-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 28px;
}
.login-brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), oklch(0.58 0.22 calc(var(--hue) + 10)));
  box-shadow: 0 6px 18px var(--accent-glow);
}
.login-brand-mark svg { width: 20px; height: 20px; flex: 0 0 auto; }
.login-brand-name {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--ink);
}

/* Headings */
h1 {
  font-size: 24px;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin: 0 0 8px;
  color: var(--ink);
}
.login-sub {
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink-3);
  margin: 0 0 28px;
}

/* Sign-in CTA */
.login-button {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  height: 50px;
  padding: 0 22px;
  border: 0;
  border-radius: var(--r-pill);
  background: linear-gradient(135deg, var(--accent), oklch(0.58 0.22 calc(var(--hue) + 8)));
  color: var(--on-accent);
  font: 500 15px/1 var(--font-ui);
  letter-spacing: 0.005em;
  cursor: pointer;
  text-decoration: none;
  box-shadow:
    0 8px 26px var(--accent-glow),
    inset 0 1px 0 oklch(1 0 0 / 0.28),
    inset 0 -1px 0 oklch(0 0 0 / 0.18);
  transition: transform 160ms ease, box-shadow 160ms ease;
}
.login-button:hover {
  transform: translateY(-1px);
  box-shadow:
    0 10px 32px var(--accent-glow),
    inset 0 1px 0 oklch(1 0 0 / 0.32),
    inset 0 -1px 0 oklch(0 0 0 / 0.18);
}
.login-button:active { transform: translateY(0); }
.login-button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}
.login-button svg { width: 16px; height: 16px; flex: 0 0 auto; }

/* Notice (errors / signed-out) */
.login-alert {
  display: none;
  margin-bottom: 22px;
  padding: 12px 14px;
  border-radius: var(--r-2);
  font-size: 13px;
  line-height: 1.4;
  align-items: flex-start;
  gap: 10px;
}
.login-alert[data-visible="true"] { display: flex; }
.login-alert[data-tone="error"] {
  background: oklch(0.68 0.20 25 / 0.14);
  border: 1px solid oklch(0.68 0.20 25 / 0.36);
  color: oklch(0.88 0.10 25);
}
.login-alert[data-tone="info"] {
  background: var(--accent-soft);
  border: 1px solid oklch(0.72 0.17 var(--hue) / 0.32);
  color: var(--ink);
}
[data-theme="light"] .login-alert[data-tone="info"] {
  color: var(--accent);
}

/* Light theme — keep the purple aurora identity. The base is a soft lavender
 * (not pure white) so saturated purple gradients can read against it instead
 * of washing out. Card stays frosted white. */
[data-theme="light"] body {
  background: oklch(0.94 0.018 var(--hue));
}
[data-theme="light"] body::before {
  background:
    radial-gradient(60% 50% at 18% 22%, oklch(0.62 0.22 var(--hue) / 0.55), transparent 60%),
    radial-gradient(55% 50% at 82% 78%, oklch(0.55 0.25 calc(var(--hue) - 18) / 0.55), transparent 60%),
    radial-gradient(45% 35% at 50% 95%, oklch(0.70 0.18 calc(var(--hue) + 12) / 0.40), transparent 70%),
    linear-gradient(180deg, oklch(0.96 0.014 var(--hue)), oklch(0.90 0.020 var(--hue)));
}
[data-theme="light"] .login-card {
  background: oklch(0.99 0.005 var(--hue) / 0.72);
  border-color: oklch(0 0 0 / 0.10);
  box-shadow:
    0 24px 72px -20px oklch(0.30 0.15 var(--hue) / 0.45),
    inset 0 1px 0 oklch(1 0 0 / 0.6);
}
[data-theme="light"] .login-brand-name { color: var(--ink-3); }
[data-theme="light"] .login-sub { color: var(--ink-2); }

/* Utility row — theme + language sit outside the card so they stay
   discreet on this single-action page. Same frosted treatment as the
   card so they read as one design language. */
.login-utility {
  position: fixed;
  top: 14px; left: 14px; right: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  z-index: 5;
}
.login-utility-spacer { flex: 1; }
.login-util-btn {
  width: 32px;
  height: 32px;
  padding: 0;
  background: oklch(0.22 0.020 var(--hue) / 0.55);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-pill);
  color: var(--ink-2);
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: color .15s, border-color .15s;
}
.login-util-btn:hover { color: var(--accent); border-color: var(--accent); }
.login-util-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.login-util-icon { width: 14px; height: 14px; }
.login-lang {
  display: inline-flex;
  gap: 2px;
  padding: 2px;
  background: oklch(0.22 0.020 var(--hue) / 0.55);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-pill);
}
.login-lang button {
  font: inherit;
  font-size: 11px;
  padding: 4px 12px;
  border: 0;
  background: none;
  color: var(--ink-2);
  border-radius: var(--r-pill);
  cursor: pointer;
}
.login-lang button[aria-pressed="true"] {
  background: var(--accent-soft);
  color: var(--accent);
}

/* Light-theme variants for the utility row */
[data-theme="light"] .login-util-btn,
[data-theme="light"] .login-lang {
  background: oklch(0.99 0.005 var(--hue) / 0.65);
  border-color: oklch(0 0 0 / 0.10);
}

/* Responsive */
@media (max-width: 480px) {
  .login-card { padding: 30px 24px 24px; }
  h1 { font-size: 22px; }
  .login-sub { font-size: 13.5px; margin-bottom: 24px; }
}

@media (prefers-reduced-motion: reduce) {
  .login-button { transition: none; }
}