/* Cronología sencilla de Python 2 - Diseño responsivo */
:root{color-scheme:light;--ink:#172335;--muted:#586779;--line:#e1e6ed;--accent:#24588a;--canvas:#fff;--panel:#f6f8fb}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--canvas);color:var(--ink);font:16px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
a{color:var(--accent)}a:hover{text-decoration:none}
button{font:inherit;cursor:pointer}
.container{width:min(1120px,calc(100% - 40px));margin-inline:auto}
.header{background:#fff;border-bottom:1px solid var(--line)}
.header-row{min-height:68px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.logo{font-size:1.3rem;font-weight:750;color:var(--ink);text-decoration:none;letter-spacing:-.04em}
.logo strong{color:var(--accent)}
.header nav{display:flex;gap:24px}
.header nav a{color:var(--muted);font-size:.94rem;text-decoration:none}
.header nav a:hover{color:var(--ink)}
.intro{padding-block:52px 38px}
.eyebrow{margin:0 0 10px;color:var(--accent);font-size:.8rem;font-weight:700;letter-spacing:.07em;text-transform:uppercase}
h1{margin:0;font-size:clamp(2rem,5vw,3.25rem);line-height:1.18;letter-spacing:-.045em}
.intro-text{max-width:750px;margin:18px 0 23px;color:var(--muted);font-size:1.08rem}
.metadata{display:flex;flex-wrap:wrap;gap:10px}
.metadata span{background:var(--panel);padding:5px 12px;border:1px solid var(--line);border-radius:50px;font-size:.82rem;color:var(--muted)}
.timeline-section{padding-bottom:20px}
.section-title{display:flex;justify-content:space-between;align-items:end;gap:15px;margin:0 0 16px}
h2{font-size:1.45rem;line-height:1.25;letter-spacing:-.02em;margin:0}
.section-title p{color:var(--muted);margin:8px 0 0;font-size:.94rem}
.controls{display:flex;border:1px solid var(--line);border-radius:7px;padding:3px;gap:3px;background:#fff;white-space:nowrap}
.controls button{background:none;border:0;color:var(--muted);padding:7px 12px;border-radius:5px;font-size:.85rem}
.controls button.selected{background:var(--accent);color:#fff}
.timeline-frame{border:1px solid var(--line);border-radius:8px;overflow:hidden;background:var(--panel)}
#timeline-embed{height:640px;width:100%}
.list-view{border:1px solid var(--line);border-radius:8px;padding:10px 22px;background:var(--panel)}
.status{color:var(--muted);margin:15px 0}
.event-list details{border-bottom:1px solid var(--line);background:var(--canvas)}
.event-list details:first-child{border-top:1px solid var(--line)}
.event-list details:last-child{border-bottom:0}
.event-list summary{list-style:none;display:flex;gap:15px;align-items:baseline;padding:15px;cursor:pointer}
.event-list summary::-webkit-details-marker{display:none}
.event-list summary::after{content:'+';margin-left:auto;color:var(--accent);font-weight:700}
.event-list details[open] summary::after{content:'−'}
.event-year{font-size:.85rem;color:var(--accent);font-weight:700;min-width:48px}
.event-heading{font-weight:650}
.event-content{padding:0 20px 22px 78px}
.event-content img{width:min(360px,100%);border-radius:5px;display:block;margin-bottom:15px;border:1px solid var(--line)}
.event-content p{margin:8px 0}
.event-category{color:var(--muted);font-size:.84rem}
.note{margin:14px 0;color:var(--muted);font-size:.84rem}
.references{padding-block:20px 56px}
.references details{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:16px 0}
.references summary{cursor:pointer;display:flex;justify-content:space-between;font-weight:650;font-size:1.05rem;list-style:none}
.references summary::-webkit-details-marker{display:none}
.references details[open] summary span{transform:rotate(45deg)}
.references details p{color:var(--muted)}
.references ol{padding-left:22px}
.references li{padding:6px 0;overflow-wrap:anywhere}
.footer{border-top:1px solid var(--line);padding:22px 0;color:var(--muted);font-size:.85rem}
[hidden]{display:none!important}
@media(max-width:750px){.container{width:min(100% - 28px,1120px)}.intro{padding-block:34px 32px}.section-title{align-items:start;flex-direction:column}.list-view{padding:8px}.event-content{padding:0 14px 18px 14px}.event-list summary{gap:8px;padding:14px 10px}.event-year{min-width:42px}#timeline-embed{height:630px}.header-row{min-height:60px}}