.ai-page { background: var(--bg); }
.ai-page .nav-links { gap: 22px; }
.ai-page ::selection { background: var(--white); color: var(--bg); }

/* Overview */
.ai-overview-hero { padding: 154px 0 0; border-bottom: 1px solid var(--line); }
.ai-overview-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(360px, .63fr); gap: clamp(54px, 8vw, 138px); align-items: end; }
.ai-overview-title h1 { max-width: 10.5ch; margin-top: 34px; color: var(--white); font-family: var(--font-display); font-size: clamp(3.2rem, 5.7vw, 5.2rem); font-weight: 500; line-height: 1; letter-spacing: -.025em; text-wrap: balance; }
.ai-overview-intro { padding-bottom: 8px; }
.ai-overview-intro > p { max-width: 55ch; color: var(--zinc-300); font-size: 1.05rem; line-height: 1.7; }
.ai-overview-principles { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); margin-top: 72px; border-top: 1px solid var(--line-2); }
.ai-overview-principles p { margin: 0; padding: 22px 28px 28px 0; }
.ai-overview-principles p + p { padding-left: 28px; border-left: 1px solid var(--line-2); }
.ai-overview-principles strong, .ai-overview-principles span { display: block; }
.ai-overview-principles strong { color: var(--white); font-family: var(--font-display); font-size: 1.08rem; font-weight: 600; }
.ai-overview-principles span { max-width: 32ch; margin-top: 5px; color: var(--zinc-400); font-size: .82rem; line-height: 1.45; }

.ai-directory-heading { display: grid; grid-template-columns: minmax(0, .75fr) minmax(340px, .55fr); gap: 42px 96px; align-items: end; }
.ai-directory-heading > p { max-width: 55ch; color: var(--zinc-400); line-height: 1.7; }
.ai-directory-list { display: grid; gap: 14px; margin-top: 52px; }
.ai-directory-row { display: grid; grid-template-columns: 155px minmax(180px, .48fr) minmax(300px, 1fr) 36px; gap: 28px; align-items: center; min-height: 112px; padding: 0 24px; border: 1px solid var(--line-2); border-radius: 16px; background: var(--surface); color: var(--white); text-decoration: none; overflow: hidden; transition: border-color .28s, background-color .28s, transform .28s var(--ease); }
.ai-directory-row:hover { border-color: var(--zinc-600); background: #0e0e12; transform: translateY(-3px); }
.ai-directory-row:focus-visible { outline: 2px solid var(--white); outline-offset: 5px; }
.ai-directory-status { display: flex; align-items: center; gap: 8px; color: var(--zinc-400); font-size: .72rem; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; }
.ai-directory-status i { width: 7px; height: 7px; flex: 0 0 auto; border-radius: 50%; background: #72d39a; }
.ai-directory-name { font-family: var(--font-display); font-size: 1.6rem; font-weight: 600; }
.ai-directory-description { max-width: 62ch; color: var(--zinc-400); line-height: 1.6; }
.ai-directory-arrow { width: 24px; height: 24px; justify-self: end; color: var(--zinc-400); transition: color .28s, transform .28s var(--ease); }
.ai-directory-row:hover .ai-directory-arrow { color: var(--white); transform: translateX(5px); }
.ai-overview-cta .cta-inner > div { max-width: 720px; }
.ai-overview-cta p { max-width: 60ch; margin-top: 14px; color: var(--zinc-400); line-height: 1.6; }

/* Product detail */
.ai-detail-hero { min-height: 760px; padding: 150px 0 88px; display: grid; align-items: center; border-bottom: 1px solid var(--line); }
.ai-detail-grid { display: grid; grid-template-columns: minmax(0, .92fr) minmax(430px, .78fr); gap: clamp(54px, 7vw, 118px); align-items: center; }
.ai-detail-copy h1 { max-width: 10.8ch; margin-top: 30px; color: var(--white); font-family: var(--font-display); font-size: clamp(3.2rem, 5.8vw, 5.35rem); font-weight: 500; line-height: .99; letter-spacing: -.025em; text-wrap: balance; }
.ai-detail-copy > p { max-width: 58ch; margin-top: 26px; color: var(--zinc-300); font-size: 1.05rem; line-height: 1.7; }
.ai-detail-facts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); margin: 48px 0 0; padding: 0; border-top: 1px solid var(--line-2); list-style: none; }
.ai-detail-facts li { padding: 18px 18px 0 0; }
.ai-detail-facts li + li { padding-left: 18px; border-left: 1px solid var(--line-2); }
.ai-detail-facts strong, .ai-detail-facts span { display: block; }
.ai-detail-facts strong { color: var(--white); font-family: var(--font-display); font-size: 1.06rem; font-weight: 600; }
.ai-detail-facts span { margin-top: 4px; color: var(--zinc-400); font-size: .78rem; line-height: 1.4; }

.ai-conversation-stage { overflow: hidden; border-radius: 16px; background: var(--surface); box-shadow: 0 30px 80px rgba(0, 0, 0, .36); }
.ai-stage-bar { display: flex; align-items: center; gap: 11px; padding: 15px 17px; border-bottom: 1px solid var(--line); background: #111114; }
.ai-stage-brand { display: grid; width: 36px; height: 36px; place-items: center; border-radius: 8px; background: var(--white); color: var(--bg); font-family: var(--font-display); font-size: .76rem; font-weight: 700; }
.ai-stage-bar > div { min-width: 0; }
.ai-stage-bar strong, .ai-stage-bar div span { display: block; }
.ai-stage-bar strong { color: var(--white); font-size: .88rem; }
.ai-stage-bar div span { margin-top: 2px; color: var(--zinc-400); font-size: .68rem; }
.ai-stage-bar i { display: inline-block; width: 6px; height: 6px; margin-right: 5px; border-radius: 50%; background: #72d39a; }
.ai-stage-live { margin-left: auto; color: var(--zinc-400); font-size: .72rem; font-variant-numeric: tabular-nums; }
.ai-stage-thread { min-height: 318px; padding: 28px 22px; display: flex; flex-direction: column; justify-content: center; gap: 18px; }
.ai-stage-message { width: fit-content; max-width: 84%; padding: 13px 15px; border-radius: 12px; font-size: .92rem; line-height: 1.55; overflow-wrap: anywhere; }
.ai-stage-message.user { align-self: flex-end; border-bottom-right-radius: 4px; background: var(--white); color: var(--bg); font-weight: 500; }
.ai-stage-message.assistant { align-self: flex-start; border-bottom-left-radius: 4px; background: #17171b; color: var(--zinc-200); }
.ai-stage-message.is-changing { animation: aiMessageChange .32s var(--ease); }
@keyframes aiMessageChange { from { opacity: .3; transform: translateY(8px); filter: blur(4px); } to { opacity: 1; transform: none; filter: none; } }
.ai-language-switch { display: flex; flex-wrap: wrap; gap: 7px; padding: 0 18px 16px; }
.ai-language-switch button { min-height: 36px; padding: 8px 12px; border: 1px solid var(--line-2); border-radius: 999px; background: transparent; color: var(--zinc-400); font: 500 .75rem/1 var(--font); cursor: pointer; transition: color .18s, border-color .18s, background .18s; }
.ai-language-switch button:hover { border-color: var(--zinc-500); color: var(--white); }
.ai-language-switch button[aria-selected="true"] { border-color: var(--white); background: var(--white); color: var(--bg); }
.ai-language-switch button:focus-visible { outline: 2px solid var(--white); outline-offset: 3px; }
.ai-stage-note { margin: 0; padding: 12px 18px; border-top: 1px solid var(--line); color: var(--zinc-500); font-size: .67rem; text-align: center; }

.ai-feature-grid, .ai-standard-grid { display: grid; grid-template-columns: minmax(0, .72fr) minmax(440px, 1fr); gap: clamp(56px, 8vw, 132px); align-items: start; }
.ai-feature-list, .ai-standard-list { margin: 0; border-top: 1px solid var(--zinc-500); }
.ai-feature-list > div, .ai-standard-list > div { display: grid; grid-template-columns: minmax(150px, .4fr) 1fr; gap: 28px; padding: 19px 0; border-bottom: 1px solid var(--line-2); }
.ai-feature-list dt, .ai-standard-list dt { color: var(--white); font-weight: 600; }
.ai-feature-list dd, .ai-standard-list dd { margin: 0; color: var(--zinc-400); line-height: 1.6; }
.ai-section-heading { display: grid; grid-template-columns: minmax(0, .85fr) minmax(340px, .55fr); gap: 42px 96px; align-items: end; }
.ai-section-heading > p { max-width: 55ch; color: var(--zinc-400); line-height: 1.7; }
.ai-faq-section .faq { margin-top: 42px; }
.ai-detail-cta .cta-inner > div { max-width: 780px; }
.ai-detail-cta p { max-width: 62ch; margin-top: 14px; color: var(--zinc-400); line-height: 1.6; }

@media (max-width: 1120px) {
  .ai-page .nav-links { gap: 15px; }
  .ai-page .nav-links a { font-size: .82rem; }
  .ai-directory-row { grid-template-columns: 132px 180px minmax(240px, 1fr) 32px; gap: 20px; }
  .ai-detail-grid { grid-template-columns: minmax(0, 1fr) minmax(390px, .8fr); gap: 44px; }
}
@media (max-width: 900px) {
  .ai-overview-hero { padding-top: 134px; }
  .ai-overview-grid, .ai-detail-grid, .ai-feature-grid, .ai-standard-grid { grid-template-columns: 1fr; }
  .ai-overview-grid { gap: 30px; align-items: start; }
  .ai-overview-intro { max-width: 650px; padding: 0; }
  .ai-directory-heading, .ai-section-heading { grid-template-columns: 1fr; gap: 16px; align-items: start; }
  .ai-detail-hero { min-height: auto; padding: 134px 0 76px; }
  .ai-detail-grid { gap: 52px; }
  .ai-conversation-stage { width: min(100%, 620px); }
  .ai-feature-grid, .ai-standard-grid { gap: 40px; }
}
@media (max-width: 700px) {
  .ai-directory-row { grid-template-columns: 1fr 30px; gap: 8px 18px; padding: 20px; }
  .ai-directory-status, .ai-directory-name, .ai-directory-description { grid-column: 1; }
  .ai-directory-arrow { grid-column: 2; grid-row: 1 / span 3; align-self: center; }
}
@media (max-width: 560px) {
  .ai-overview-hero { padding-top: 116px; }
  .ai-overview-title h1 { max-width: 11ch; margin-top: 24px; font-size: clamp(2.65rem, 13vw, 3.8rem); }
  .ai-overview-principles { grid-template-columns: 1fr; margin-top: 44px; }
  .ai-overview-principles p, .ai-overview-principles p + p { padding: 15px 0; border-left: 0; border-bottom: 1px solid var(--line-2); }
  .ai-directory-list { margin-top: 36px; }
  .ai-detail-copy h1 { max-width: 11ch; margin-top: 24px; font-size: clamp(2.7rem, 13.5vw, 4rem); }
  .ai-detail-facts { grid-template-columns: 1fr; margin-top: 38px; }
  .ai-detail-facts li, .ai-detail-facts li + li { padding: 14px 0; border-left: 0; border-bottom: 1px solid var(--line-2); }
  .ai-stage-thread { min-height: 286px; padding: 23px 15px; }
  .ai-stage-message { max-width: 92%; }
  .ai-language-switch { padding: 0 14px 14px; }
  .ai-language-switch button { flex: 1 1 calc(50% - 7px); }
  .ai-feature-list > div, .ai-standard-list > div { grid-template-columns: 1fr; gap: 5px; }
}
@media (prefers-reduced-motion: reduce) {
  .ai-stage-message.is-changing { animation: none; }
  .ai-directory-row, .ai-directory-arrow { transition: none; }
}