/*
 * Beta teacher AI tools (see TeacherAiTools) and the AI Toolkit pages. Hand-written and scoped under .tai
 * so it needs no Tailwind build. Look: warm neutrals, teal primary, flat outlined cards, and frosted glass
 * on the result only. Light only for now. Uses the site's own fonts.
 */

.tai {
  --tai-bg: #f5f2ea;
  --tai-surface: #fffefb;
  --tai-surface-solid: #fffefb;
  --tai-surface-2: #f0ece1;
  --tai-border: #e4dfd1;
  --tai-text: #1b1a17;
  --tai-muted: #706c62;
  --tai-accent: #33c6c6;
  --tai-accent-text: #0f7f80;
  --tai-accent-fg: #062b2b;
  --tai-accent-soft: #d4f3f3;
  --tai-accent-soft-fg: #06383a;
  --tai-chip-border: #d9d3c2;
  --tai-good: #23794a;
  --tai-good-soft: #dcf1e3;
  --tai-warn: #8f5207;
  --tai-warn-soft: #fbebcc;
  --tai-bad: #b5342a;
  --tai-bad-soft: #fbe3df;
  --tai-glass: rgba(255, 255, 255, 0.5);
  --tai-glass-border: rgba(255, 255, 255, 0.85);
  --tai-glass-blur: blur(20px) saturate(1.5);
  --tai-radius: 18px;
  --tai-btn-radius: 10px;
  --tai-heading: "proxima-nova", "proxima-soft", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --tai-wash:
    radial-gradient(900px 480px at 8% -8%, #c6ecea, transparent 70%),
    radial-gradient(800px 480px at 100% 30%, #efe2c2, transparent 70%);
}

/* ---------- Base ---------- */

.tai, .tai *, .tai *::before, .tai *::after { box-sizing: border-box; }

.tai {
  position: relative;
  min-height: 100vh;
  background: var(--tai-wash), var(--tai-bg);
  color: var(--tai-text);
  font-family: "proxima-soft", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.55;
  overflow: hidden;
  container: tai / inline-size;
  width: 100%;
}

.tai a { color: inherit; }
.tai h1, .tai h2, .tai h3, .tai p { margin: 0; }
.tai h1, .tai h2, .tai h3 { font-family: var(--tai-heading); font-weight: 600; text-wrap: balance; }
.tai-mono { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; }

/* ---------- Hero ---------- */

.tai-hero { position: relative; padding: 28px 24px 40px; }
.tai-hero__inner, .tai-main { max-width: 1160px; margin: 0 auto; position: relative; }

.tai-topbar { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 28px; }

.tai-crumbs { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; font-size: 13px; color: var(--tai-muted); }
.tai-crumbs a { text-decoration: none; }
.tai-crumbs a:hover { color: var(--tai-accent-text); text-decoration: underline; }
.tai-crumbs span[aria-hidden] { opacity: 0.5; }

.tai-title-row { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }

.tai-icon {
  flex: none; display: grid; place-items: center;
  width: 52px; height: 52px; border-radius: 14px; font-size: 21px;
  color: var(--tai-accent-fg); background: var(--tai-accent);
}

.tai-title { font-size: clamp(28px, 3.8vw, 38px); letter-spacing: -0.02em; line-height: 1.12; animation: tai-rise 0.5s both; }
.tai-tagline { margin-top: 12px; max-width: 640px; font-size: 18px; color: var(--tai-muted); animation: tai-rise 0.5s 0.08s both; }
.tai-meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; animation: tai-rise 0.5s 0.16s both; }

.tai-pill {
  display: inline-flex; align-items: center; gap: 8px; padding: 4px 12px; border-radius: 999px;
  font-size: 12.5px; color: var(--tai-muted); border: 1px solid var(--tai-border);
}
.tai-pill--beta { color: var(--tai-accent-text); border-color: currentColor; text-transform: uppercase; letter-spacing: 0.08em; font-size: 11px; font-weight: 600; }
.tai-pill--beta::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: currentColor; animation: tai-pulse 1.8s ease-in-out infinite; }

/* ---------- Layout ---------- */

.tai-main { padding: 20px 24px 72px; display: grid; gap: 24px; grid-template-columns: minmax(0, 1fr); }
@container tai (min-width: 900px) { .tai-main--split { grid-template-columns: minmax(0, 1fr) 340px; align-items: start; } }

.tai-card {
  position: relative; border-radius: var(--tai-radius); padding: 28px;
  background: var(--tai-surface); border: 1px solid var(--tai-border);
  animation: tai-rise 0.5s 0.1s both;
}
.tai-card--side { padding: 22px; animation-delay: 0.2s; }
.tai-card--glass, .tai-mail {
  background: var(--tai-glass); border-color: var(--tai-glass-border);
  backdrop-filter: var(--tai-glass-blur); -webkit-backdrop-filter: var(--tai-glass-blur);
}
.tai-card + .tai-card { margin-top: 20px; }

.tai-notice {
  display: flex; gap: 12px; align-items: flex-start; padding: 14px 16px; margin-bottom: 24px; border-radius: 14px;
  font-size: 14px; color: var(--tai-text); background: var(--tai-warn-soft);
}
.tai-notice i { color: var(--tai-warn); margin-top: 3px; }

.tai-alert {
  padding: 14px 16px; margin-bottom: 24px; border-radius: 14px; font-size: 14px;
  color: var(--tai-text); background: var(--tai-bad-soft); border: 1px solid var(--tai-bad);
}
.tai-alert strong { display: block; color: var(--tai-bad); margin-bottom: 4px; }
.tai-alert ul { margin: 0; padding-left: 18px; }

/* ---------- Form ---------- */

.tai-field { margin-bottom: 24px; animation: tai-rise 0.5s both; }

.tai-label { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; font-size: 14px; font-weight: 600; color: var(--tai-muted); }
.tai-optional { font-size: 12px; font-weight: 400; color: var(--tai-muted); }

.tai-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.tai-chip { position: relative; cursor: pointer; }
.tai-chip input { position: absolute; opacity: 0; inset: 0; width: 100%; height: 100%; margin: 0; cursor: pointer; }
.tai-chip span {
  display: inline-flex; align-items: center; padding: 8px 15px; border-radius: var(--tai-btn-radius);
  font-size: 14px; color: var(--tai-text); border: 1px solid var(--tai-chip-border);
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.tai-chip:hover span { border-color: var(--tai-accent); }
.tai-chip input:checked + span { background: var(--tai-accent-soft); color: var(--tai-accent-soft-fg); border-color: transparent; }
.tai-chip input:checked + span::before { content: "\2713"; margin-right: 7px; font-size: 12px; }
.tai-chip input:focus-visible + span { outline: 2px solid var(--tai-accent); outline-offset: 2px; }

.tai-input {
  width: 100%; padding: 12px 14px; border-radius: 12px; font: inherit; font-size: 15px; color: var(--tai-text);
  background: transparent; border: 1px solid var(--tai-border); resize: vertical;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.tai-input::placeholder { color: var(--tai-muted); opacity: 0.8; }
.tai-input:focus { outline: none; border-color: var(--tai-accent); box-shadow: 0 0 0 3px var(--tai-accent-soft); }

.tai-fieldfoot { display: flex; justify-content: space-between; gap: 12px; margin-top: 8px; font-size: 12.5px; color: var(--tai-muted); }
.tai-count { font-variant-numeric: tabular-nums; white-space: nowrap; }
.tai-count.is-near { color: var(--tai-warn); }

.tai-btn {
  position: relative; display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  padding: 12px 22px; border: 0; border-radius: var(--tai-btn-radius); cursor: pointer;
  font: inherit; font-size: 15px; font-weight: 600; color: var(--tai-accent-fg); text-decoration: none;
  background: var(--tai-accent); transition: filter 0.15s, transform 0.15s;
}
.tai-btn:hover { filter: brightness(1.06); }
.tai-btn:active { transform: scale(0.98); }
.tai-btn:focus-visible { outline: 2px solid var(--tai-accent); outline-offset: 3px; }
.tai-btn[disabled] { cursor: progress; filter: saturate(0.6); }
.tai-btn .tai-spin { display: none; width: 16px; height: 16px; border-radius: 50%; border: 2px solid rgba(6, 43, 43, 0.3); border-top-color: var(--tai-accent-fg); animation: tai-spin 0.7s linear infinite; }
.tai-btn.is-loading .tai-spin { display: inline-block; }
.tai-btn.is-loading .tai-sparkle { display: none; }

.tai-btn--ghost { color: var(--tai-text); background: transparent; border: 1px solid var(--tai-chip-border); padding: 9px 16px; font-size: 14px; font-weight: 500; }
.tai-btn--ghost:hover { border-color: var(--tai-accent); background: var(--tai-accent-soft); filter: none; }

/* ---------- Side panel ---------- */

.tai-side-title { display: flex; align-items: center; gap: 8px; margin-bottom: 12px; font-size: 12px; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; color: var(--tai-muted); }
.tai-recent { list-style: none; margin: 0; padding: 0; }
.tai-recent li + li { border-top: 1px solid var(--tai-border); }
.tai-recent a { display: block; padding: 10px 6px; border-radius: 8px; text-decoration: none; font-size: 14px; font-weight: 600; transition: background 0.15s; }
.tai-recent a:hover { background: var(--tai-accent-soft); }
.tai-recent small { display: block; font-weight: 400; font-size: 12px; color: var(--tai-muted); }
.tai-empty { font-size: 14px; color: var(--tai-muted); }

.tai-privacy { display: flex; gap: 12px; font-size: 13.5px; color: var(--tai-muted); }
.tai-privacy i { color: var(--tai-accent-text); font-size: 18px; margin-top: 2px; }
.tai-privacy strong { color: var(--tai-text); }

/* ---------- Generating ---------- */

.tai-working { text-align: center; padding: 48px 24px; overflow: hidden; }
.tai-orbit { position: relative; width: 84px; height: 84px; margin: 0 auto 24px; }
.tai-orbit i { position: absolute; inset: 0; display: grid; place-items: center; font-size: 26px; color: var(--tai-accent-text); animation: tai-pulse 1.8s ease-in-out infinite; }
.tai-orbit::before, .tai-orbit::after { content: ""; position: absolute; inset: 0; border-radius: 50%; border: 2px solid transparent; }
.tai-orbit::before { border-top-color: var(--tai-accent); animation: tai-spin 1.3s linear infinite; }
.tai-orbit::after { inset: 10px; border-bottom-color: var(--tai-chip-border); animation: tai-spin 1.9s linear infinite reverse; }
.tai-working h2 { font-size: 22px; letter-spacing: -0.01em; }
.tai-stage { min-height: 24px; margin-top: 8px; color: var(--tai-muted); font-size: 15px; }
.tai-stage::after { content: "_"; animation: tai-blink 1s steps(1) infinite; }
.tai-bar { height: 4px; max-width: 320px; margin: 22px auto 0; border-radius: 4px; background: var(--tai-accent-soft); overflow: hidden; }
.tai-bar::before { content: ""; display: block; height: 100%; width: 40%; border-radius: 4px; background: var(--tai-accent); animation: tai-indeterminate 1.4s ease-in-out infinite; }
.tai-skeleton { max-width: 520px; margin: 32px auto 0; text-align: left; }
.tai-skeleton span { display: block; height: 12px; margin-bottom: 12px; border-radius: 6px; background: linear-gradient(90deg, var(--tai-surface-2) 25%, var(--tai-accent-soft) 50%, var(--tai-surface-2) 75%); background-size: 200% 100%; animation: tai-shimmer 1.6s linear infinite; }
.tai-skeleton span:nth-child(2) { width: 92%; }
.tai-skeleton span:nth-child(3) { width: 78%; }
.tai-skeleton span:nth-child(4) { width: 55%; }

/* ---------- Results ---------- */

.tai-toolbar { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 18px; }
.tai-btn.is-done { background: var(--tai-good-soft); color: var(--tai-good); }

.tai-reveal > * { animation: tai-rise 0.5s both; }
.tai-reveal > *:nth-child(2) { animation-delay: 0.06s; }
.tai-reveal > *:nth-child(3) { animation-delay: 0.12s; }
.tai-reveal > *:nth-child(4) { animation-delay: 0.18s; }
.tai-reveal > *:nth-child(5) { animation-delay: 0.24s; }

.tai-mail { border-radius: var(--tai-radius); overflow: hidden; border: 1px solid var(--tai-glass-border); }
.tai-mail__bar { display: flex; align-items: center; gap: 7px; padding: 11px 22px; border-bottom: 1px solid var(--tai-border); }
.tai-mail__bar i { display: none; }
.tai-mail__bar span { font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--tai-muted); }
.tai-mail__row { display: flex; gap: 14px; padding: 11px 22px; border-bottom: 1px solid var(--tai-border); font-size: 14px; }
.tai-mail__row dt { flex: none; width: 64px; color: var(--tai-muted); }
.tai-mail__row dd { margin: 0; font-weight: 600; }
.tai-mail__body { padding: 22px; font-size: 16px; line-height: 1.7; }
.tai-mail__body p { margin-bottom: 14px; white-space: pre-line; }

.tai-token { padding: 1px 7px; border-radius: 6px; font-weight: 600; color: var(--tai-warn); background: var(--tai-warn-soft); }
.tai-token--filled { color: var(--tai-accent-soft-fg); background: var(--tai-accent-soft); }

.tai-comment { font-size: 18px; line-height: 1.75; }
.tai-namebox { margin-bottom: 22px; padding: 16px; border-radius: 14px; background: var(--tai-accent-soft); color: var(--tai-accent-soft-fg); }
.tai-namebox label { display: block; margin-bottom: 8px; font-size: 14px; font-weight: 600; }
.tai-namebox small { display: flex; gap: 8px; align-items: center; margin-top: 8px; font-size: 12.5px; opacity: 0.85; }
.tai-namebox .tai-input { color: var(--tai-text); background: var(--tai-surface); }
.tai-stats { display: flex; align-items: center; gap: 14px; margin-top: 22px; padding-top: 16px; border-top: 1px solid var(--tai-border); font-size: 13px; color: var(--tai-muted); }
.tai-stats b { color: var(--tai-text); font-variant-numeric: tabular-nums; }

.tai-footer-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }

/* ---------- Toolkit index and tiles ---------- */

.tai-page { background: #f5f2ea; color: #1b1a17; }
.tai-page-footer { padding: 28px 16px 36px; text-align: center; font-size: 13px; color: #706c62; background: #f5f2ea; }
.tai-section { margin-bottom: 36px; }
.tai-section-head { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.tai-section-head h2 { font-size: 22px; letter-spacing: -0.01em; }
.tai-section-head p { font-size: 14px; color: var(--tai-muted); }
.tai-tiles { display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.tai-tile {
  --mx: 50%; --my: 50%;
  position: relative; display: flex; flex-direction: column; padding: 22px; border-radius: var(--tai-radius); text-decoration: none; overflow: hidden;
  color: var(--tai-text); background: var(--tai-surface); border: 1px solid var(--tai-border);
  transition: border-color 0.15s, background 0.15s; animation: tai-rise 0.5s both;
}
.tai-tile::before { content: ""; position: absolute; inset: 0; pointer-events: none; opacity: 0; transition: opacity 0.3s; background: radial-gradient(240px circle at var(--mx) var(--my), rgba(51, 198, 198, 0.14), transparent 70%); }
.tai-tile:hover { border-color: var(--tai-accent); }
.tai-tile:hover::before { opacity: 1; }
.tai-tile .tai-icon { width: 44px; height: 44px; border-radius: 12px; font-size: 18px; margin-bottom: 14px; }
.tai-tile h3 { display: flex; align-items: center; gap: 10px; font-size: 18px; letter-spacing: -0.01em; }
.tai-tile p { margin-top: 6px; font-size: 14px; color: var(--tai-muted); }
.tai-tile__cta { display: inline-flex; align-items: center; gap: 8px; margin-top: auto; padding-top: 16px; font-size: 14px; font-weight: 600; color: var(--tai-accent-text); }
.tai-tile__cta i { transition: transform 0.2s; }
.tai-tile:hover .tai-tile__cta i { transform: translateX(4px); }

/* ---------- Motion ---------- */

@keyframes tai-rise { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
@keyframes tai-pulse { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: 0.55; transform: scale(0.88); } }
@keyframes tai-spin { to { transform: rotate(360deg); } }
@keyframes tai-shimmer { to { background-position: -200% 0; } }
@keyframes tai-indeterminate { 0% { transform: translateX(-110%); } 100% { transform: translateX(280%); } }
@keyframes tai-blink { 50% { opacity: 0; } }

@media (prefers-reduced-motion: reduce) {
  .tai *, .tai *::before, .tai *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}

/* ---------- Small screens and print ---------- */

@container tai (max-width: 640px) {
  .tai-hero { padding: 20px 16px 28px; }
  .tai-main { padding: 16px 16px 56px; }
  .tai-card { padding: 20px; }
  .tai-mail__row, .tai-mail__bar { padding-left: 16px; padding-right: 16px; }
}

@media print {
  .tai { background: #fff; color: #000; overflow: visible; }
  .tai-hero, .tai-toolbar, .tai-footer-actions, .tai-notice, .tai-side { display: none !important; }
  .tai-card, .tai-mail { background: #fff; backdrop-filter: none; border-color: #ccc; animation: none; }
  .tai-main { padding: 0; }
}

/* Toolkit page: locked tiles and the subscription banner */
.tai-tile--locked { cursor: not-allowed; filter: grayscale(0.6); background: var(--tai-surface-2); }
.tai-tile--locked .tai-icon { opacity: 0.55; }
.tai-tile--locked:hover { transform: none; box-shadow: none; }
.tai-banner {
  display: flex; flex-wrap: wrap; align-items: center; gap: 14px; margin-bottom: 24px; padding: 14px 18px;
  background: var(--tai-warn-soft); color: var(--tai-warn); border: 1px solid var(--tai-chip-border); border-radius: var(--tai-radius);
}
.tai-banner > div { flex: 1 1 240px; display: flex; flex-direction: column; gap: 2px; }
.tai-banner .tai-banner__cta {
  background: var(--tai-accent-text); color: #fff; padding: 8px 16px; border-radius: var(--tai-btn-radius);
  font-weight: 600; text-decoration: none; transition: background 0.2s;
}
.tai-banner .tai-banner__cta:hover, .tai-banner .tai-banner__cta:focus-visible { background: var(--tai-accent-soft-fg); color: #fff; }