/* ============================================================
   LEME — Laboratorio de Ensayos de Máquinas Eléctricas, UdeC
   Shared design system
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;1,400&family=IBM+Plex+Serif:ital,wght@0,400;0,500;0,600;1,400&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

:root{
  /* Brand */
  --navy:      #0E2A4E;   /* deep UDEC blue, brand anchor */
  --navy-900:  #081A31;   /* near-black blue */
  --navy-700:  #16406F;
  --navy-600:  #1E5FA8;   /* link / interactive blue */
  --blue-tint: #E8EEF5;

  --copper:    #B4622E;   /* winding-copper accent */
  --copper-600:#9C4F22;
  --copper-300:#E3B591;
  --copper-tint:#F6ECE3;

  --ink:       #0C1A2E;   /* primary text */
  --ink-70:    #3A4757;
  --ink-50:    #5E6976;
  --ink-30:    #8893A0;

  --paper:     #FAF8F4;   /* warm off-white bg */
  --paper-2:   #F1EEE7;   /* alt section bg */
  --paper-3:   #E9E5DC;
  --white:     #FEFDFB;

  --line:      rgba(12,26,46,0.12);
  --line-soft: rgba(12,26,46,0.07);
  --line-strong: rgba(12,26,46,0.22);

  --maxw: 1240px;
  --gutter: clamp(20px, 5vw, 64px);

  --serif: 'IBM Plex Serif', Georgia, serif;
  --sans:  'IBM Plex Sans', system-ui, sans-serif;
  --mono:  'IBM Plex Mono', ui-monospace, monospace;

  --ease: cubic-bezier(.22,.61,.36,1);
}

/* ---------- reset ---------- */
*,*::before,*::after{ box-sizing:border-box; }
html{ -webkit-text-size-adjust:100%; scroll-behavior:smooth; }
body{
  margin:0;
  font-family:var(--sans);
  color:var(--ink);
  background:var(--paper);
  font-size:17px;
  line-height:1.6;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
button{ font-family:inherit; }
h1,h2,h3,h4,h5,p{ margin:0; }

/* ---------- language toggle ---------- */
[data-lang]{ }
body:not(.en) [data-lang="en"]{ display:none !important; }
body.en [data-lang="es"]{ display:none !important; }

/* ---------- layout ---------- */
.wrap{ max-width:var(--maxw); margin:0 auto; padding-inline:var(--gutter); }
.wrap-wide{ max-width:1480px; margin:0 auto; padding-inline:var(--gutter); }
section{ position:relative; }
.section{ padding-block:clamp(64px,9vw,128px); }
.section-sm{ padding-block:clamp(48px,6vw,88px); }

/* ---------- type ---------- */
.eyebrow{
  font-family:var(--mono);
  font-size:12.5px;
  font-weight:500;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--copper-600);
  display:inline-flex;
  align-items:center;
  gap:10px;
}
.eyebrow::before{
  content:"";
  width:22px; height:1px; background:var(--copper);
  display:inline-block;
}
.eyebrow.no-tick::before{ display:none; }

.display{
  font-family:var(--serif);
  font-weight:500;
  line-height:1.04;
  letter-spacing:-0.015em;
  font-size:clamp(38px, 6vw, 76px);
}
h1,.h1{ font-family:var(--serif); font-weight:500; line-height:1.06; letter-spacing:-0.012em; font-size:clamp(34px,4.6vw,56px); }
h2,.h2{ font-family:var(--serif); font-weight:500; line-height:1.1; letter-spacing:-0.01em; font-size:clamp(28px,3.4vw,42px); }
h3,.h3{ font-family:var(--sans); font-weight:600; line-height:1.2; font-size:clamp(19px,1.6vw,23px); letter-spacing:-0.005em; }
.lede{ font-size:clamp(18px,1.5vw,21px); line-height:1.55; color:var(--ink-70); font-weight:400; }
.mono-label{ font-family:var(--mono); font-size:12px; letter-spacing:.1em; text-transform:uppercase; color:var(--ink-50); }
.serif-quote{ font-family:var(--serif); font-style:italic; }

.measure{ max-width:62ch; }
.measure-sm{ max-width:46ch; }

/* ---------- buttons ---------- */
.btn{
  display:inline-flex; align-items:center; gap:10px;
  font-family:var(--sans); font-weight:500; font-size:15px;
  padding:13px 22px; border-radius:2px; cursor:pointer;
  border:1px solid transparent; transition:all .25s var(--ease);
  letter-spacing:.01em;
}
.btn .arr{ transition:transform .25s var(--ease); }
.btn:hover .arr{ transform:translateX(4px); }
.btn-primary{ background:var(--navy); color:var(--white); }
.btn-primary:hover{ background:var(--navy-900); }
.btn-copper{ background:var(--copper); color:#fff; }
.btn-copper:hover{ background:var(--copper-600); }
.btn-ghost{ background:transparent; color:var(--ink); border-color:var(--line-strong); }
.btn-ghost:hover{ border-color:var(--ink); background:var(--ink); color:var(--white); }
.btn-light{ background:rgba(255,255,255,.1); color:#fff; border-color:rgba(255,255,255,.28); }
.btn-light:hover{ background:#fff; color:var(--navy); border-color:#fff; }

.link-arrow{
  display:inline-flex; align-items:center; gap:8px;
  font-weight:500; font-size:15px; color:var(--navy-600);
  border-bottom:1px solid transparent; padding-bottom:2px;
  transition:all .2s var(--ease);
}
.link-arrow .arr{ transition:transform .2s var(--ease); }
.link-arrow:hover{ border-color:var(--navy-600); }
.link-arrow:hover .arr{ transform:translateX(3px); }

/* ---------- header / nav ---------- */
.site-header{
  position:sticky; top:0; z-index:60;
  background:rgba(250,248,244,0.82);
  backdrop-filter:blur(14px) saturate(1.2);
  -webkit-backdrop-filter:blur(14px) saturate(1.2);
  border-bottom:1px solid var(--line-soft);
}
.nav{
  display:flex; align-items:center; justify-content:space-between;
  height:72px; gap:24px;
}
.brand{ display:flex; align-items:center; gap:13px; flex-shrink:0; }
.brand .mark{ width:34px; height:34px; flex-shrink:0; }
.brand .brand-txt{ display:flex; flex-direction:column; line-height:1; }
.brand .brand-name{ font-family:var(--mono); font-weight:600; font-size:18px; letter-spacing:.16em; color:var(--navy); }
.brand .brand-sub{ font-size:10.5px; letter-spacing:.04em; color:var(--ink-50); margin-top:4px; max-width:200px; }

.nav-links{ display:flex; align-items:center; gap:4px; }
.nav-links a{
  font-size:14.5px; font-weight:450; color:var(--ink-70);
  padding:9px 13px; border-radius:2px; position:relative;
  transition:color .2s var(--ease);
}
.nav-links a:hover{ color:var(--navy); }
.nav-links a.active{ color:var(--navy); font-weight:600; }
.nav-links a.active::after{
  content:""; position:absolute; left:13px; right:13px; bottom:2px;
  height:2px; background:var(--copper);
}
.nav-right{ display:flex; align-items:center; gap:14px; flex-shrink:0; }

.lang-toggle{
  display:inline-flex; align-items:center; border:1px solid var(--line-strong);
  border-radius:2px; overflow:hidden; font-family:var(--mono); font-size:12px;
}
.lang-toggle button{
  border:0; background:transparent; padding:7px 10px; cursor:pointer;
  color:var(--ink-50); font-weight:500; letter-spacing:.06em; transition:all .2s var(--ease);
}
.lang-toggle button.on{ background:var(--navy); color:#fff; }

.nav-toggle{
  display:none; width:42px; height:42px; border:1px solid var(--line-strong);
  background:transparent; border-radius:2px; cursor:pointer; padding:0;
  position:relative;
}
.nav-toggle span,.nav-toggle span::before,.nav-toggle span::after{
  content:""; position:absolute; left:11px; width:18px; height:1.6px; background:var(--ink);
  transition:.25s var(--ease);
}
.nav-toggle span{ top:50%; transform:translateY(-50%); }
.nav-toggle span::before{ top:-6px; left:0; }
.nav-toggle span::after{ top:6px; left:0; }
body.menu-open .nav-toggle span{ background:transparent; }
body.menu-open .nav-toggle span::before{ top:0; transform:rotate(45deg); }
body.menu-open .nav-toggle span::after{ top:0; transform:rotate(-45deg); }

/* ---------- footer ---------- */
.site-footer{ background:var(--navy-900); color:#C9D4E2; }
.site-footer a{ color:#C9D4E2; }
.footer-top{ display:grid; grid-template-columns:1.5fr 1fr 1fr 1fr; gap:40px; padding-block:64px; }
.footer-brand .mark{ width:40px; height:40px; margin-bottom:18px; }
.footer-col h4{ font-family:var(--mono); font-size:11.5px; letter-spacing:.16em; text-transform:uppercase; color:#6E8199; margin-bottom:16px; font-weight:600; }
.footer-col a, .footer-col p{ display:block; font-size:14.5px; line-height:1.5; margin-bottom:10px; color:#AFBDCE; transition:color .2s; }
.footer-col a:hover{ color:#fff; }
.footer-bottom{ border-top:1px solid rgba(255,255,255,.1); padding-block:22px; display:flex; justify-content:space-between; gap:16px; flex-wrap:wrap; font-size:12.5px; color:#6E8199; font-family:var(--mono); letter-spacing:.04em; }

/* ---------- image placeholders ---------- */
.ph{
  position:relative; overflow:hidden; background:var(--paper-3);
  background-image:repeating-linear-gradient(135deg,
     rgba(14,42,78,.06) 0, rgba(14,42,78,.06) 1px,
     transparent 1px, transparent 11px);
  border:1px solid var(--line); border-radius:3px;
  display:flex; align-items:center; justify-content:center;
}
.ph.dark{
  background:var(--navy); border-color:rgba(255,255,255,.12);
  background-image:repeating-linear-gradient(135deg,
     rgba(255,255,255,.05) 0, rgba(255,255,255,.05) 1px,
     transparent 1px, transparent 11px);
}
.ph::after{
  content:attr(data-label);
  font-family:var(--mono); font-size:11.5px; letter-spacing:.06em;
  color:var(--ink-50); text-transform:uppercase; text-align:center;
  padding:8px 14px; max-width:80%; line-height:1.5;
  border:1px dashed var(--line-strong); border-radius:2px; background:rgba(255,255,255,.4);
}
.ph.dark::after{ color:#9DB0C7; border-color:rgba(255,255,255,.22); background:rgba(8,26,49,.4); }

/* ---------- cards ---------- */
.card{
  background:var(--white); border:1px solid var(--line);
  border-radius:4px; overflow:hidden; transition:all .3s var(--ease);
}
.card-hover:hover{ transform:translateY(-4px); box-shadow:0 18px 40px -20px rgba(12,26,46,.35); border-color:var(--line-strong); }

/* ---------- chip ---------- */
.chip{
  display:inline-flex; align-items:center; gap:7px; font-family:var(--mono);
  font-size:11.5px; letter-spacing:.06em; text-transform:uppercase;
  padding:5px 11px; border:1px solid var(--line); border-radius:100px;
  color:var(--ink-70); background:var(--white);
}
.chip.copper{ color:var(--copper-600); border-color:var(--copper-300); background:var(--copper-tint); }
.chip.navy{ color:var(--navy); border-color:rgba(14,42,78,.2); background:var(--blue-tint); }

/* ---------- rotor motif (allowed simple geometry) ---------- */
.rotor{ display:block; }
.rotor circle, .rotor line{ vector-effect:non-scaling-stroke; }
.mark .ring-poles{ stroke:var(--copper); fill:none; }
img.mark{ display:block; object-fit:contain; }
.mark .ring-core{ stroke:var(--navy); fill:none; }
.mark .hub{ fill:var(--navy); }
.mark .shaft{ fill:var(--copper); }
.site-footer .mark .ring-core{ stroke:#8FA3BC; }
.site-footer .mark .hub{ fill:#DCE5F0; }
.on-navy .mark .ring-core{ stroke:#B9C8DC; }
.on-navy .mark .hub{ fill:#fff; }
@keyframes spin{ to{ transform:rotate(360deg); } }
.rotor-spin{ transform-origin:50% 50%; animation:spin 36s linear infinite; }
@media (prefers-reduced-motion:reduce){ .rotor-spin{ animation:none; } }

/* ---------- reveal anim ---------- */
.reveal{ opacity:0; transform:translateY(18px); transition:opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in{ opacity:1; transform:none; }
@media (prefers-reduced-motion:reduce){ .reveal{ opacity:1; transform:none; } }

/* ---------- dividers / misc ---------- */
.hr{ height:1px; background:var(--line); border:0; }
.kicker-num{ font-family:var(--mono); font-size:12px; color:var(--copper-600); letter-spacing:.1em; }

/* ============================================================
   responsive
   ============================================================ */
@media (max-width:1080px){
  .footer-top{ grid-template-columns:1fr 1fr; gap:36px; }
}
@media (max-width:1024px){
  .nav-links, .nav-right .lang-toggle.desk{ display:none; }
  .nav-toggle{ display:block; }
  .mobile-menu{ display:flex; }
}
@media (min-width:1025px){
  .mobile-menu{ display:none !important; }
}

/* mobile menu panel */
.mobile-menu{
  position:fixed; inset:72px 0 0 0; z-index:55;
  background:var(--paper); flex-direction:column;
  padding:24px var(--gutter) 40px; gap:2px;
  transform:translateY(-12px); opacity:0; pointer-events:none;
  transition:opacity .3s var(--ease), transform .3s var(--ease);
  overflow-y:auto;
}
body.menu-open .mobile-menu{ opacity:1; transform:none; pointer-events:auto; }
.mobile-menu a{
  font-family:var(--serif); font-size:26px; color:var(--navy);
  padding:16px 0; border-bottom:1px solid var(--line-soft);
}
.mobile-menu a.active{ color:var(--copper-600); }
.mobile-menu .mm-lang{ margin-top:24px; }

@media (max-width:680px){
  .footer-top{ grid-template-columns:1fr 1fr; }
  .brand .brand-sub{ display:none; }
  body{ font-size:16px; }
}
@media (max-width:460px){
  .footer-top{ grid-template-columns:1fr; }
}