/* Fundamentos científicos — complementa styles.css y estudios.css */
.fu-index{display:flex;flex-wrap:wrap;gap:8px;padding:22px 7%;border-bottom:1px solid var(--line);background:#fff}
.fu-index a{font-size:.82rem;text-decoration:none;border:1px solid var(--line);border-radius:999px;padding:7px 14px;min-height:36px;display:inline-flex;align-items:center}
.fu-index a:hover{background:var(--mist);color:var(--green)}
.fu-conv{padding:64px 7%;background:var(--lime)}
.fu-conv .eyebrow{color:var(--green)}
.fu-conv h2{font-size:clamp(2rem,3.2vw,3.2rem);margin-bottom:18px}
.fu-conv h2 em{color:var(--green)}
.fu-conv-head{max-width:900px;margin-bottom:34px}
.fu-conv-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.fu-conv-grid article{background:#fffef6;padding:22px;border-top:3px solid var(--green)}
.fu-conv-grid span{font-size:.7rem;letter-spacing:.14em;font-weight:700;text-transform:uppercase;color:var(--green)}
.fu-conv-grid h3{font:1.25rem/1.25 var(--serif);margin:10px 0 8px}
.fu-conv-grid p{font-size:.92rem;color:var(--muted);margin:0}
@media(max-width:1050px){.fu-conv-grid{grid-template-columns:1fr 1fr}}
@media(max-width:760px){.fu-conv{padding:48px 7%}.fu-conv-grid{grid-template-columns:1fr}}
.fu-time{padding:64px 7%;background:var(--deep);color:#fff}
.fu-time .eyebrow,.fu-time h2 em{color:var(--lime)}
.fu-time h2{font-size:clamp(2rem,3.2vw,3.2rem);margin-bottom:18px}
.fu-time .fu-claim{color:#e0e8df}
.fu-timeline{list-style:none;margin:0;padding:0;border-left:2px solid #6d8b78;max-width:900px}
.fu-timeline li{position:relative;padding:0 0 22px 28px}
.fu-timeline li::before{content:"";position:absolute;left:-7px;top:6px;width:12px;height:12px;border-radius:50%;background:var(--lime)}
.fu-timeline b{font:1.5rem var(--serif);color:var(--lime);display:block;margin-bottom:2px}
.fu-timeline p{margin:0;color:#e0e8df;font-size:.97rem}
.fu-timeline a{color:#fff;font-weight:650}
@media(max-width:760px){.fu-time{padding:48px 7%}}
.fu-safety{margin:40px 7% 0;padding:20px 24px;background:#fbf6ea;border-left:4px solid #b98900;font-size:.95rem;color:#4a3608}
.fu-safety strong{color:#3b2a04}
.fu-block{display:grid;grid-template-columns:200px 1fr;gap:40px;padding:56px 7%;border-bottom:1px solid var(--line);scroll-margin-top:100px}
.fu-block:nth-of-type(even){background:#f7f8f4}
.fu-num{font:3.4rem/1 var(--serif);color:#79906b}
.fu-num small{display:block;font:650 .72rem/1.4 var(--sans);letter-spacing:.14em;color:var(--muted);margin-top:12px;text-transform:uppercase}
.fu-block h2{font-size:clamp(1.9rem,2.8vw,2.7rem);margin-bottom:18px}
.fu-claim{font-size:1.15rem;line-height:1.6;max-width:820px;margin-bottom:26px}
.fu-cols{display:grid;grid-template-columns:1fr;gap:28px;max-width:900px}
.fu-cols h3{font-size:.74rem;letter-spacing:.14em;text-transform:uppercase;margin-bottom:12px}
.fu-ev h3{color:var(--green)}
.fu-ev ul{margin:0;padding:0;list-style:none}
.fu-ev li{border-top:1px solid var(--line);padding:12px 0;font-size:.94rem}
.fu-ev li:last-child{border-bottom:1px solid var(--line)}
.fu-ev li a{font-weight:650}
.fu-ev .lvl{display:inline-block;font-size:.66rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;padding:2px 7px;border-radius:3px;background:var(--mist);margin-right:6px;vertical-align:1px}
.fu-not{background:#fff;border:1px solid var(--line);border-top:4px solid #b4553d;padding:20px 22px;align-self:start}
.fu-not h3{color:#8a3a26}
.fu-not p{font-size:.94rem;color:var(--muted);margin:0 0 10px}
.fu-not p:last-child{margin:0}
@media(max-width:1050px){.fu-block{grid-template-columns:1fr;gap:10px}.fu-cols{grid-template-columns:1fr}}
@media(max-width:760px){.fu-block{padding:44px 7%}.fu-num{font-size:2.6rem}.fu-safety{margin:30px 7% 0}}