/* ============================================================
   HP AI Academy — home.css (HOMEPAGE ONLY)
   Hero, pyramid, streams, programme cards, impact, faculty.
   Loaded by index.html after css/styles.css.
   ============================================================ */
/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; background: var(--ink); color: var(--white); padding: 130px 0 110px; }
.hero::before { /* aurora glow */
  content: ""; position: absolute; inset: -40% -20% auto; height: 130%;
  background:
    radial-gradient(38% 55% at 22% 38%, rgba(2,74,216,.55), transparent 70%),
    radial-gradient(30% 45% at 68% 24%, rgba(244,105,78,.32), transparent 70%),
    radial-gradient(26% 40% at 86% 62%, rgba(0,150,214,.28), transparent 70%);
  filter: blur(48px); pointer-events: none;
}
.hero::after { /* fine grid */
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,.045) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.045) 1px, transparent 1px);
  background-size: 56px 56px; pointer-events: none;
  mask-image: radial-gradient(80% 90% at 50% 10%, #000 30%, transparent 100%);
}
.hero__inner { position: relative; z-index: 1; max-width: 860px; }
.hero .eyebrow { color: #9DBCFF; }
.hero h1 { color: var(--white); text-wrap: balance; }
.hero h1 em { font-style: normal; color: #9DBCFF; }
.hero__lede { color: #C9D2E6; font-size: clamp(17px, 2vw, 20px); max-width: 56ch; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 26px; }
.hero__tagline { display: inline-flex; gap: 0; align-items: center; border: 1px solid rgba(255,255,255,.25); font-size: 13px; letter-spacing: 2.5px; text-transform: uppercase; font-weight: 700; margin-bottom: 26px; }
.hero__tagline span { padding: 8px 16px; }
.hero__tagline span + span { border-left: 1px solid rgba(255,255,255,.25); }
.hero__tagline .t-learn { color: #9FC2D8; }
.hero__tagline .t-lead  { color: #FFA593; }
.hero__tagline .t-shape { color: #9DBCFF; }

/* ---------- Stats strip ---------- */
.facts { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.stat { text-align: center; padding: 34px 8px; border-right: 1px solid var(--line); }
.stat:last-child { border-right: 0; }
.stat strong { display: block; font-size: 46px; font-weight: 700; line-height: 1; color: var(--accent); }
.stat span { font-size: 12px; text-transform: uppercase; letter-spacing: 2px; color: var(--gray); }

/* ---------- Pyramid ---------- */
.pyramid-wrap { position: relative; max-width: 1060px; margin: 0 auto; }
.pyramid-svg { width: 100%; height: auto; display: block; }

.py-seg { cursor: pointer; transition: filter .2s var(--ease), opacity .2s; }
.py-seg:hover .py-fill, .py-seg:focus-visible .py-fill, .py-seg.is-active .py-fill { filter: brightness(1.14); }
.py-seg:hover, .py-seg:focus-visible { outline: none; }
.py-seg .py-fill { transition: filter .2s var(--ease); }

.py-label   { font-family: var(--font); font-weight: 700; fill: #fff; }
.py-sub     { font-family: var(--font); font-weight: 400; font-style: italic; fill: rgba(255,255,255,.85); }
.py-tier    { font-family: var(--font); font-weight: 700; fill: var(--black); letter-spacing: .5px; }
.py-side    { font-family: var(--font); font-weight: 500; fill: var(--gray); }

/* Bubble / popover */
.py-bubble {
  position: absolute; z-index: 20; width: min(360px, 88vw);
  background: var(--white); border: 1px solid var(--line);
  box-shadow: 0 24px 60px -12px rgba(10,15,40,.25);
  padding: 22px 24px; opacity: 0; visibility: hidden; transform: translateY(8px);
  transition: opacity .22s var(--ease), transform .22s var(--ease), visibility .22s;
}
.py-bubble.is-open { opacity: 1; visibility: visible; transform: translateY(0); }
.py-bubble::before { content: ""; position: absolute; top: -7px; left: var(--arrow-x, 32px); width: 12px; height: 12px; background: var(--white); border-left: 1px solid var(--line); border-top: 1px solid var(--line); transform: rotate(45deg); }
.py-bubble .eyebrow { margin-bottom: 6px; font-size: 11px; }
.py-bubble h4 { margin: 0 0 6px; font-size: 19px; font-weight: 700; }
.py-bubble p { font-size: 14.5px; margin: 0 0 10px; }
.py-bubble .py-bubble__meta { display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; color: var(--gray-2); margin-bottom: 4px; }
.py-bubble a.py-bubble__link { font-weight: 700; font-size: 14px; color: var(--accent); }
.py-bubble a.py-bubble__link::after { content: " →"; }
.py-bubble .py-bubble__soon { font-size: 13px; color: var(--gray-2); font-style: italic; }
.py-bubble__close { position: absolute; top: 8px; right: 10px; border: 0; background: none; font-size: 20px; line-height: 1; cursor: pointer; color: var(--gray-2); padding: 4px; }
.py-bubble__close:hover { color: var(--black); }

.pyramid-hint { text-align: center; font-size: 13px; letter-spacing: 1.5px; text-transform: uppercase; color: var(--gray-2); margin-top: 18px; }

/* ---------- Streams (Learn AI) ---------- */
.streams { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.stream { background: var(--white); border: 1px solid var(--line); border-top: 4px solid var(--accent); padding: 0 0 24px; display: flex; flex-direction: column; transition: transform .25s var(--ease), box-shadow .25s var(--ease); }
.stream:hover { transform: translateY(-6px); box-shadow: 0 24px 48px -18px rgba(10,15,40,.18); }
.stream__head { background: var(--accent); color: var(--white); padding: 16px 22px; }
.stream__head h3 { color: var(--white); margin: 0; font-size: 19px; letter-spacing: .3px; text-transform: uppercase; }
.stream__meta { padding: 14px 22px 0; font-size: 12.5px; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; color: var(--gray-2); }
.stream__tagline { padding: 10px 22px 0; margin: 0; font-size: 14.5px; font-style: italic; color: var(--gray); }
.stream ul { list-style: none; margin: 10px 0 0; padding: 0 22px; flex: 1; }
.stream li { padding: 11px 0; border-bottom: 1px solid var(--line); font-size: 15px; font-weight: 500; color: #222; }
.stream li:last-child { border-bottom: 0; }
.stream__foot { padding: 16px 22px 0; }
.stream__foot .py-bubble__soon { font-size: 13px; }

/* ---------- Programme tiers overview ---------- */
.tiers { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.tier { border: 1px solid var(--line); background: var(--white); padding: 28px; position: relative; overflow: hidden; }
.tier::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 4px; }
.tier--learn::before { background: var(--learn); }
.tier--lead::before  { background: var(--lead); }
.tier--shape::before { background: var(--shape); }
.tier h3 { font-size: 26px; }
.tier .tier__kind { font-size: 12px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase; color: var(--gray-2); display: block; margin-bottom: 12px; }
.tier p { font-size: 15px; }

/* ---------- Faculty ---------- */
.faculty-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 22px 18px; }
.fac { text-align: center; }
.fac__avatar { width: 92px; height: 92px; margin: 0 auto 12px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 26px; color: var(--white); background: linear-gradient(135deg, var(--accent), #0096D6); border: 3px solid var(--white); box-shadow: 0 0 0 1px var(--line), 0 10px 24px -10px rgba(10,15,40,.35); overflow: hidden; }
.fac__avatar img { width: 100%; height: 100%; object-fit: cover; border-radius: 50%; }
.fac:nth-child(3n+2) .fac__avatar { background: linear-gradient(135deg, #F4694E, #C2472F); }
.fac:nth-child(3n)   .fac__avatar { background: linear-gradient(135deg, #45718C, #27455A); }
.fac strong { display: block; font-size: 14.5px; line-height: 1.25; }
.fac span { display: block; font-size: 12.5px; color: var(--gray); font-style: italic; margin-top: 3px; }

/* ---------- CTA band ---------- */
.cta-band { text-align: center; }
.cta-band h2 { max-width: 20ch; margin: 0 auto .4em; }
.cta-band p { max-width: 58ch; margin: 0 auto 1.6em; }

/* ---------- Editorial split (image + copy) ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(36px, 5vw, 72px); align-items: center; }
.split--rev .split__media { order: 2; }
.split__media { position: relative; }
.split__media .frame { position: relative; overflow: hidden; display: block; }
.split__media .frame img { width: 100%; aspect-ratio: 4/3; object-fit: cover; transition: transform .9s var(--ease); }
.split__media:hover .frame img { transform: scale(1.06); }
.split__media::before { content: ""; position: absolute; inset: 18px -18px -18px 18px; border: 2px solid var(--accent); z-index: -1; }
.split--lead .split__media::before { border-color: var(--lead); }
.split--learn .split__media::before { border-color: var(--learn); }
.split__media .frame::after { content: ""; position: absolute; inset: 0; background: linear-gradient(160deg, rgba(2,74,216,.14), transparent 45%); pointer-events: none; }
.split__caption { position: absolute; left: 0; bottom: 0; background: var(--black); color: var(--white); font-size: 11.5px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase; padding: 9px 16px; }

/* ---------- Programme cards (rich) ---------- */
.prog-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; margin-top: 44px; }
.prog { background: var(--white); border: 1px solid var(--line); padding: 30px 30px 26px; position: relative; overflow: hidden; transition: transform .25s var(--ease), box-shadow .25s var(--ease); }
.prog:hover { transform: translateY(-5px); box-shadow: 0 26px 52px -20px rgba(10,15,40,.2); }
.prog::before { content: ""; position: absolute; top: 0; left: 0; bottom: 0; width: 4px; background: var(--accent); }
.prog--lead::before { background: var(--lead); }
.prog--shape::before { background: var(--shape); }
.prog--learn::before { background: var(--learn); }
.prog h3 { font-size: 24px; margin-bottom: 2px; }
.prog .prog__tag { display: block; font-size: 13px; font-weight: 700; color: var(--accent); margin-bottom: 12px; }
.prog--lead .prog__tag { color: #D24A2F; }
.prog--learn .prog__tag { color: #35617C; }
.prog p { font-size: 15px; }
.prog__dur { position: absolute; top: 26px; right: 26px; font-size: 11.5px; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; color: var(--gray-2); border: 1px solid var(--line); padding: 5px 10px; }

/* ---------- Fact chips ---------- */
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.chip { border: 1px solid var(--line); background: var(--bg-soft); padding: 6px 12px; font-size: 12px; font-weight: 700; letter-spacing: .8px; text-transform: uppercase; color: #333; }
.chip b { color: var(--accent); }

/* ---------- Impact band (dark, big numbers) ---------- */
.impact { display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; margin-top: 12px; }
.impact__item { border-top: 2px solid rgba(255,255,255,.18); padding-top: 22px; }
.impact__item strong { display: block; font-size: clamp(44px, 5vw, 68px); font-weight: 700; line-height: 1; color: var(--white); letter-spacing: -.02em; }
.impact__item strong em { font-style: normal; color: #7EA4FF; }
.impact__item span { display: block; margin-top: 10px; font-size: 13px; letter-spacing: 1.5px; text-transform: uppercase; color: #9aa0ad; }

/* ---------- Quote / photo band ---------- */
.photo-band { position: relative; color: var(--white); padding: 140px 0; background-size: cover; background-position: center 30%; }
.photo-band::before { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(8,10,20,.88) 0%, rgba(8,10,20,.55) 55%, rgba(8,10,20,.25) 100%); }
.photo-band .container { position: relative; }
.photo-band blockquote { margin: 0; max-width: 720px; font-size: clamp(24px, 3.4vw, 40px); font-weight: 700; line-height: 1.2; color: var(--white); text-wrap: balance; }
.photo-band cite { display: block; margin-top: 22px; font-style: normal; font-size: 14px; letter-spacing: 2px; text-transform: uppercase; color: #B8C2D8; }

/* ---------- Endorsement / logos strip ---------- */
.endorse { display: flex; flex-wrap: wrap; gap: 10px 28px; align-items: baseline; margin-top: 18px; }
.endorse span { font-size: 14px; font-weight: 500; color: var(--gray); }
.endorse span::before { content: "◆"; color: var(--accent); font-size: 9px; margin-right: 8px; vertical-align: 2px; }

/* ---------- Scroll reveal ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.is-visible { opacity: 1; transform: none; }
.reveal[data-delay="1"] { transition-delay: .12s; }
.reveal[data-delay="2"] { transition-delay: .24s; }
.reveal[data-delay="3"] { transition-delay: .36s; }

/* ---------- Responsive (home) ---------- */
@media (max-width: 980px) {
  .streams, .tiers { grid-template-columns: 1fr 1fr; }
  .split { grid-template-columns: 1fr; }
  .split--rev .split__media { order: 0; }
  .prog-grid { grid-template-columns: 1fr; }
  .impact { grid-template-columns: 1fr 1fr; }
  .faculty-grid { grid-template-columns: repeat(4, 1fr); }
  .facts { grid-template-columns: repeat(2, 1fr); }
  .stat { border-bottom: 1px solid var(--line); }
}
@media (max-width: 720px) {
  .hero { padding: 90px 0 70px; }
  .streams, .tiers { grid-template-columns: 1fr; }
  .faculty-grid { grid-template-columns: repeat(3, 1fr); }
  .photo-band { padding: 96px 0; }
}
@media (max-width: 480px) {
  .faculty-grid { grid-template-columns: repeat(2, 1fr); }
  .facts { grid-template-columns: 1fr 1fr; }
  .hero__tagline { flex-direction: column; align-items: stretch; text-align: center; }
  .hero__tagline span + span { border-left: 0; border-top: 1px solid rgba(255,255,255,.25); }
}