/* ============================================================
   Knowell — About (关于我们) page
   ============================================================ */

/* hero */
.about-hero { position: relative; min-height: 52vh; display: flex; align-items: center; background: var(--navy-900); color: #fff; overflow: hidden; padding: calc(var(--nav-h) + 50px) 0 56px; }
.about-hero .mesh { position: absolute; inset: -20%; background: radial-gradient(46% 50% at 24% 32%, rgba(0,114,255,.4), transparent 60%), radial-gradient(40% 46% at 84% 20%, rgba(0,198,255,.3), transparent 60%), radial-gradient(52% 60% at 68% 96%, rgba(121,40,202,.24), transparent 60%); filter: blur(16px); animation: meshDrift 24s ease-in-out infinite alternate; }
.about-hero .grid-tex { position: absolute; inset: 0; background-image: linear-gradient(rgba(120,190,255,.06) 1px, transparent 1px), linear-gradient(90deg, rgba(120,190,255,.06) 1px, transparent 1px); background-size: 54px 54px; mask-image: radial-gradient(120% 100% at 40% 25%, #000 30%, transparent 80%); }
.about-hero .veil { position: absolute; inset: 0; background: linear-gradient(180deg, rgba(10,25,47,.35), rgba(10,25,47,.78)); }
.about-hero .wrap { position: relative; z-index: 2; max-width: 860px; }
.about-hero .crumb { font-family: var(--mono); font-size: 12.5px; color: rgba(255,255,255,.55); margin-bottom: 20px; letter-spacing: .5px; }
.about-hero .crumb a:hover { color: var(--cyan); }
.about-hero h1 { font-size: clamp(36px, 5.4vw, 64px); font-weight: 800; letter-spacing: -1.4px; line-height: 1.05; }
.about-hero .lead { margin-top: 22px; font-size: 19px; color: rgba(255,255,255,.8); max-width: 680px; line-height: 1.7; }

/* mission / vision */
.mv-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; }
.mv-card { position: relative; border-radius: var(--r-card-lg); padding: 40px; overflow: hidden; color: #fff; min-height: 240px; display: flex; flex-direction: column; justify-content: flex-end; }
.mv-card .gradlayer { position: absolute; inset: 0; z-index: 0; }
.mv-card .grid-tex { position: absolute; inset: 0; z-index: 1; background-image: linear-gradient(rgba(255,255,255,.08) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.08) 1px, transparent 1px); background-size: 40px 40px; mask-image: radial-gradient(120% 120% at 80% 0%, #000, transparent 75%); }
.mv-card > * { position: relative; z-index: 2; }
.mv-card .mv-ic { width: 56px; height: 56px; border-radius: 15px; background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.25); backdrop-filter: blur(6px); display: grid; place-items: center; margin-bottom: auto; }
.mv-card .mv-ic svg { width: 28px; height: 28px; }
.mv-card .label { font-family: var(--mono); font-size: 13px; letter-spacing: 2px; text-transform: uppercase; opacity: .85; margin-top: 24px; }
.mv-card h3 { font-size: 26px; font-weight: 800; line-height: 1.3; margin-top: 12px; letter-spacing: -.4px; text-wrap: balance; }

/* team */
.team-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.member { background: #fff; border: 1px solid var(--ink-100); border-radius: var(--r-card); padding: 30px; box-shadow: var(--sh-card); transition: transform .3s, box-shadow .3s; display: flex; flex-direction: column; }
.member:hover { transform: translateY(-4px); box-shadow: var(--sh-card-hover); }
.member-top { display: flex; align-items: center; gap: 16px; }
.avatar { width: 60px; height: 60px; border-radius: 16px; display: grid; place-items: center; color: #fff; font-family: var(--mono); font-weight: 700; font-size: 22px; flex-shrink: 0; box-shadow: 0 6px 16px rgba(0,114,255,.3); }
.member-name b { display: block; font-size: 19px; font-weight: 800; letter-spacing: -.3px; }
.member-name .title { font-size: 13px; color: var(--blue); font-weight: 600; margin-top: 3px; }
.member-school { margin-top: 16px; display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--ink-700); }
.member-school svg { width: 15px; height: 15px; color: var(--ink-grey); flex-shrink: 0; }
.member-tags { margin-top: 12px; display: flex; flex-wrap: wrap; gap: 7px; }
.member-tags span { font-size: 11.5px; color: var(--blue); background: var(--grad-soft); padding: 5px 11px; border-radius: var(--r-pill); font-weight: 500; }
.member-bio { margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--ink-100); display: flex; flex-direction: column; gap: 9px; }
.member-bio li { display: flex; gap: 9px; font-size: 13px; color: var(--ink-700); line-height: 1.55; }
.member-bio li svg { width: 14px; height: 14px; color: var(--blue); flex-shrink: 0; margin-top: 3px; }

/* research strength */
.research-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.rstat { text-align: center; background: rgba(255,255,255,.04); border: 1px solid var(--navy-line); border-radius: var(--r-card); padding: 34px 20px; transition: transform .3s, border-color .3s; }
.rstat:hover { transform: translateY(-4px); border-color: rgba(0,198,255,.4); }
.rstat .v { font-family: var(--mono); font-weight: 700; font-size: 52px; line-height: 1; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; font-variant-numeric: tabular-nums; }
.rstat .l { color: rgba(255,255,255,.72); font-size: 15px; margin-top: 12px; }
.uni-wall { margin-top: 56px; }
.uni-wall .uw-head { text-align: center; font-family: var(--mono); font-size: 13px; letter-spacing: 2px; text-transform: uppercase; color: rgba(255,255,255,.5); margin-bottom: 26px; }
.uni-logos { display: flex; flex-wrap: wrap; justify-content: center; gap: 16px; }
.uni { display: flex; align-items: center; gap: 12px; padding: 16px 26px; border-radius: var(--r-card); border: 1px solid var(--navy-line); background: rgba(255,255,255,.03); transition: border-color .2s, transform .2s, background .2s; }
.uni:hover { border-color: rgba(0,198,255,.45); transform: translateY(-2px); background: rgba(0,198,255,.05); }
.uni .crest { width: 44px; height: 44px; border-radius: 12px; background: var(--grad); display: grid; place-items: center; color: #fff; font-weight: 800; font-size: 17px; flex-shrink: 0; }
.uni div b { display: block; color: #fff; font-size: 15px; font-weight: 700; }
.uni div span { font-size: 11.5px; color: rgba(255,255,255,.5); font-family: var(--mono); }

/* values */
.values-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.value { background: #fff; border: 1px solid var(--ink-100); border-radius: var(--r-card); padding: 30px 26px; box-shadow: var(--sh-card); transition: transform .3s, box-shadow .3s; position: relative; overflow: hidden; }
.value::before { content: ""; position: absolute; inset: 0 0 auto 0; height: 4px; background: var(--grad); transform: scaleX(0); transform-origin: left; transition: transform .3s; }
.value:hover { transform: translateY(-4px); box-shadow: var(--sh-card-hover); }
.value:hover::before { transform: scaleX(1); }
.value .vc-ic { width: 54px; height: 54px; border-radius: 15px; background: var(--grad-soft); color: var(--blue); display: grid; place-items: center; margin-bottom: 18px; }
.value .vc-ic svg { width: 28px; height: 28px; }
.value h3 { font-size: 19px; font-weight: 800; }
.value p { margin-top: 10px; font-size: 14.5px; color: var(--ink-700); line-height: 1.6; }
.value .vc-num { position: absolute; top: 20px; right: 22px; font-family: var(--mono); font-size: 40px; font-weight: 700; color: var(--ink-100); line-height: 1; }

/* CTA */
.about-cta { background: var(--grad); color: #fff; text-align: center; position: relative; overflow: hidden; }
.about-cta .grid-tex2 { position: absolute; inset: 0; background-image: linear-gradient(rgba(255,255,255,.1) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.1) 1px, transparent 1px); background-size: 40px 40px; mask-image: radial-gradient(120% 120% at 50% 50%, #000, transparent 75%); }
.about-cta .wrap { position: relative; z-index: 1; }
.about-cta h2 { font-size: clamp(28px, 4vw, 44px); font-weight: 800; letter-spacing: -1px; text-wrap: balance; }
.about-cta p { margin-top: 14px; font-size: 18px; opacity: .92; }
.about-cta .acts { margin-top: 30px; display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

@media (max-width: 980px) {
  .team-grid { grid-template-columns: repeat(2, 1fr); }
  .research-stats, .values-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .mv-grid { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .team-grid, .research-stats, .values-grid { grid-template-columns: 1fr; }
}