/* Kelnode — hosting.mrsaitam.com. Mismos tokens, fuentes autoalojadas y animaciones que el portfolio. */
@font-face { font-family: 'Space Grotesk'; font-style: normal; font-weight: 400 700; font-display: swap; src: url(assets/fonts/space-grotesk-latin.woff2) format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: 'Manrope'; font-style: normal; font-weight: 400 800; font-display: swap; src: url(assets/fonts/manrope-latin.woff2) format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: 'DM Mono'; font-style: normal; font-weight: 400; font-display: swap; src: url(assets/fonts/dm-mono-400.woff2) format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: 'DM Mono'; font-style: normal; font-weight: 500; font-display: swap; src: url(assets/fonts/dm-mono-500.woff2) format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }

/* ==========================================================================
   COLORES. Para cambiar la marca a azul/violeta (como el logo), reemplazá los
   dos valores de --accent y --accent-strong del tema oscuro y del claro por:
   oscuro  → #7aa2ff / #9bb8ff      claro → #3a5fd0 / #2d4db3
   ========================================================================== */
:root {
  color-scheme: dark;
  --bg: #111210; --bg-soft: #171815; --surface: #1b1c18; --surface-2: #20211d;
  --text: #f0f0e9; --muted: #a0a197; --subtle: #787a70;
  --line: rgba(238,239,228,.12); --line-strong: rgba(238,239,228,.22);
  --accent: #ff7848; --accent-strong: #ff9068; --accent-wash: rgba(255,120,72,.09);
  --green: #b8d8a4;
  --heading: 'Space Grotesk', system-ui, sans-serif;
  --body: 'Manrope', system-ui, sans-serif;
  --mono: 'DM Mono', ui-monospace, monospace;
  --hdr: 4.4rem; --max: 80rem;
  --sal: env(safe-area-inset-left, 0px); --sar: env(safe-area-inset-right, 0px); --sab: env(safe-area-inset-bottom, 0px);
  --ease: cubic-bezier(.22,1,.36,1);
}
:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f2f1eb; --bg-soft: #eae9e1; --surface: #e5e4dc; --surface-2: #dcdbd2;
  --text: #191a17; --muted: #5d6057; --subtle: #74766d;
  --line: rgba(25,26,23,.12); --line-strong: rgba(25,26,23,.23);
  --accent: #bd4524; --accent-strong: #a9391c; --accent-wash: rgba(189,69,36,.08);
  --green: #3d7046;
}

* { box-sizing: border-box; }
html {
  background: var(--bg); color: var(--text); font-family: var(--body);
  font-size: clamp(15px, min(calc(15px + (100vw - 1500px) * .0075), calc(15px + (100vh - 900px) * .0125)), 21px);
  line-height: 1.7; -webkit-text-size-adjust: 100%; text-size-adjust: 100%; -webkit-tap-highlight-color: transparent;
  scroll-padding-top: calc(var(--hdr) + 1rem);
}
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }
html.menu-open { overflow: hidden; }
body { margin: 0; min-height: 100vh; overflow-x: hidden; background: var(--bg); }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }
h1, h2, h3, p, ul, ol, figure, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
::selection { background: var(--accent); color: #111210; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.mono { font-family: var(--mono); font-size: .7333rem; letter-spacing: .08em; }
.eyebrow { font: 500 .7333rem var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--accent); margin-bottom: 1.1rem; }
.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding-left: max(1.6rem, var(--sal)); padding-right: max(1.6rem, var(--sar)); }
.skip { position: absolute; left: -999px; top: .6rem; z-index: 100; background: var(--accent); color: #111210; padding: .5rem 1rem; font-weight: 700; }
.skip:focus { left: .6rem; }
.progress { position: fixed; top: 0; left: 0; right: 0; height: 2px; z-index: 80; background: var(--accent); transform-origin: 0 50%; transform: scaleX(0); pointer-events: none; }

/* ---------- HEADER ---------- */
.hdr { position: fixed; top: 0; left: 0; right: 0; z-index: 60; height: var(--hdr); border-bottom: 1px solid transparent; transition: border-color .3s, background .3s; }
.hdr.is-scrolled, .menu-open .hdr { border-bottom-color: var(--line); background: color-mix(in srgb, var(--bg) 84%, transparent); backdrop-filter: blur(1.2rem); -webkit-backdrop-filter: blur(1.2rem); }
.hdr .wrap { height: 100%; display: flex; align-items: center; gap: 2rem; }
.brand { display: inline-flex; align-items: center; gap: .7rem; font: 700 1.2rem var(--heading); letter-spacing: -.045em; }
.logo { width: 2.1rem; height: 2.1rem; flex: none; transition: transform .6s var(--ease); }
.brand:hover .logo { transform: rotate(180deg); }
.logo .ring { fill: none; stroke: url(#kg); stroke-width: 3.5; }
.logo .k { fill: none; stroke: var(--text); stroke-width: 4.2; stroke-linecap: square; }
.nav { margin-left: auto; display: flex; align-items: center; gap: 1.9rem; font-size: .9rem; color: var(--muted); }
.nav a:not(.btn) { position: relative; padding: .3rem 0; transition: color .2s; }
.nav a:not(.btn)::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 1px; background: var(--accent); transform: scaleX(0); transform-origin: 0 50%; transition: transform .35s var(--ease); }
.nav a:not(.btn):hover, .nav a[aria-current] { color: var(--text); }
.nav a:not(.btn):hover::after, .nav a[aria-current]::after { transform: scaleX(1); }
.icon-btn { background: transparent; border: 1px solid var(--line); width: 2.4rem; height: 2.4rem; display: grid; place-items: center; cursor: pointer; flex: none; transition: border-color .2s, transform .4s var(--ease); }
.icon-btn:hover { border-color: var(--accent); }
#themeBtn:hover { transform: rotate(-14deg); }
.icon-btn svg { width: 1.0667rem; height: 1.0667rem; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
.moon-icon { display: none; }
:root[data-theme="light"] .sun-icon { display: none; }
:root[data-theme="light"] .moon-icon { display: block; }
.menu-btn { display: none; flex-direction: column; gap: 4px; }
.menu-btn span { display: block; width: 1rem; height: 1.5px; background: currentColor; transition: transform .3s var(--ease), opacity .2s; }
.menu-open .menu-btn span:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
.menu-open .menu-btn span:nth-child(2) { opacity: 0; }
.menu-open .menu-btn span:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }

/* ---------- BOTONES ---------- */
.btn { display: inline-flex; align-items: center; gap: .7rem; height: 2.9rem; padding: 0 1.4rem; border: 1px solid var(--line-strong); background: transparent; font: 600 .9rem var(--body); cursor: pointer; white-space: nowrap; transition: border-color .25s, background .25s, color .25s, transform .35s var(--ease); }
.btn span[aria-hidden] { transition: transform .35s var(--ease); }
.btn:hover { border-color: var(--accent); }
.btn:hover span[aria-hidden] { transform: translateX(4px); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #111210; }
:root[data-theme="light"] .btn-primary { color: #fff; }
.btn-primary:hover { background: var(--accent-strong); border-color: var(--accent-strong); transform: translateY(-2px); }
.btn-sm { height: 2.3rem; padding: 0 1.1rem; font-size: .8333rem; }

/* ---------- HERO ---------- */
.hero { position: relative; padding: calc(var(--hdr) + 4.5rem) 0 4.5rem; overflow: hidden; }
.hero::before { content: ""; position: absolute; inset: 0; background-image: radial-gradient(color-mix(in srgb, var(--text) 16%, transparent) 1px, transparent 1.5px); background-size: 2.1333rem 2.1333rem; -webkit-mask-image: radial-gradient(ellipse 80% 70% at 70% 40%, #000 20%, transparent 75%); mask-image: radial-gradient(ellipse 80% 70% at 70% 40%, #000 20%, transparent 75%); pointer-events: none; }
.hero .wrap { position: relative; display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr); gap: 3rem; align-items: center; }
.chip { display: inline-flex; align-items: center; gap: .6rem; padding: .35rem .8rem; border: 1px solid var(--line-strong); font: .7333rem var(--mono); letter-spacing: .06em; color: var(--muted); }
.chip i { position: relative; width: .45rem; height: .45rem; border-radius: 50%; background: var(--accent); }
.chip i::after { content: ""; position: absolute; inset: 0; border-radius: 50%; background: inherit; animation: ping 2.4s ease-out infinite; }
h1 { font: 600 clamp(2.5rem, 5.6vw, 4.4rem)/1.02 var(--heading); letter-spacing: -.06em; margin-top: 1.4rem; }
h1 em, h2 em { font-style: normal; color: var(--accent); }
.lead { margin-top: 1.5rem; max-width: 36rem; font-size: 1.1333rem; line-height: 1.7; color: var(--muted); }
.cta-row { display: flex; flex-wrap: wrap; gap: .9rem; margin-top: 2.2rem; }
.hero-note { margin-top: 1.4rem; font-size: .8667rem; color: var(--subtle); max-width: 32rem; }

/* rack decorativo */
.rack { width: 100%; max-width: 27rem; margin-left: auto; display: block; overflow: visible; }
.rk-frame { fill: var(--bg-soft); stroke: var(--line-strong); stroke-width: 1.2; }
.rk-rail { stroke: var(--line); stroke-width: 1; }
.rk-unit { fill: var(--surface); stroke: var(--line-strong); stroke-width: 1; transition: stroke .3s; }
.rack .u:hover .rk-unit { stroke: var(--accent); }
.rk-vent { stroke: var(--line-strong); stroke-width: 1.4; }
.rk-bay { fill: none; stroke: var(--line); stroke-width: 1; }
.rk-txt { font: 500 9px var(--mono); letter-spacing: .1em; fill: var(--subtle); }
.led { fill: var(--accent); animation: blink 2.6s steps(1, end) infinite; animation-delay: var(--d, 0s); }
.led.g { fill: var(--green); animation-name: blink-g; }
.rk-scan { fill: url(#scan); opacity: .55; animation: scan 6s linear infinite; }
.rack .u { animation: rise .8s var(--ease) both; animation-delay: calc(var(--i) * 120ms + 300ms); }
.rk-float { animation: float 7s ease-in-out infinite; }

/* tira de tecnologías */
.strip { border-block: 1px solid var(--line); overflow: hidden; background: var(--bg-soft); }
.strip-track { display: flex; width: max-content; animation: marquee 38s linear infinite; }
.strip:hover .strip-track { animation-play-state: paused; }
.strip-track span { padding: 1rem 2.2rem; font: .8rem var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--muted); white-space: nowrap; }
.strip-track span::before { content: "/"; color: var(--accent); margin-right: 1.1rem; }

/* ---------- SECCIONES ---------- */
section { position: relative; }
.sec { padding: 6rem 0 0; }
.sec-head { max-width: 40rem; }
h2 { font: 600 clamp(1.9rem, 3.6vw, 2.8rem)/1.08 var(--heading); letter-spacing: -.055em; }
.sec-lead { margin-top: 1rem; color: var(--muted); font-size: 1.0667rem; }

.cards { margin-top: 2.6rem; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.card { position: relative; overflow: hidden; padding: 1.8rem; border: 1px solid var(--line); background: var(--surface); transition: border-color .3s, transform .45s var(--ease); }
.card::before { content: ""; position: absolute; inset: 0; background: radial-gradient(18rem circle at var(--mx, 50%) var(--my, 0%), var(--accent-wash), transparent 70%); opacity: 0; transition: opacity .35s; pointer-events: none; }
.card:hover { border-color: var(--accent); transform: translateY(-4px); }
.card:hover::before { opacity: 1; }
.card > * { position: relative; }
.card .num { color: var(--accent); }
.card h3 { margin-top: 1.4rem; font: 600 1.4rem/1.15 var(--heading); letter-spacing: -.045em; }
.card p { margin-top: .7rem; color: var(--muted); font-size: .95rem; line-height: 1.7; }
.card .ico { position: absolute; top: 1.6rem; right: 1.6rem; width: 1.9rem; height: 1.9rem; fill: none; stroke: var(--subtle); stroke-width: 1.4; stroke-linecap: round; stroke-linejoin: round; transition: stroke .3s, transform .5s var(--ease); }
.card:hover .ico { stroke: var(--accent); transform: translateY(-3px) rotate(-6deg); }
.note { margin-top: 1rem; display: flex; gap: .9rem; align-items: flex-start; padding: 1rem 1.2rem; border: 1px dashed var(--line-strong); color: var(--muted); font-size: .9333rem; }
.note b { color: var(--text); }
.note svg { flex: none; width: 1.15rem; height: 1.15rem; margin-top: .2rem; fill: none; stroke: var(--accent); stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }

/* proceso */
.steps { margin-top: 3rem; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1.6rem; counter-reset: s; position: relative; }
.steps li { position: relative; padding-top: 3.6rem; counter-increment: s; }
.steps li::before { content: counter(s, decimal-leading-zero); position: absolute; top: 0; left: 0; display: grid; place-items: center; width: 2.5rem; height: 2.5rem; border: 1px solid var(--accent); background: var(--bg); color: var(--accent); font: 500 .8rem var(--mono); z-index: 1; }
.steps li::after { content: ""; position: absolute; top: 1.25rem; left: 2.5rem; right: -1.6rem; height: 1px; background: var(--line-strong); transform: scaleX(0); transform-origin: 0 50%; transition: transform 1s var(--ease); transition-delay: calc(var(--i, 0) * 180ms); }
.steps li:last-child::after { display: none; }
.steps.in li::after { transform: scaleX(1); }
.steps h3 { font: 600 1.15rem/1.2 var(--heading); letter-spacing: -.035em; }
.steps p { margin-top: .5rem; color: var(--muted); font-size: .9rem; line-height: 1.65; }

/* por qué */
.why { display: grid; grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr); gap: 4rem; align-items: start; }
.why .sec-head { position: sticky; top: calc(var(--hdr) + 2rem); }
.about { margin-top: 2rem; padding: 1.3rem; border: 1px solid var(--line); background: var(--surface); font-size: .9333rem; color: var(--muted); }
.about b { color: var(--text); font-family: var(--heading); letter-spacing: -.02em; }
.about a { color: var(--accent); border-bottom: 1px solid color-mix(in srgb, var(--accent) 35%, transparent); }
.points li { padding: 1.6rem 0; border-top: 1px solid var(--line); display: grid; grid-template-columns: 3rem 1fr; gap: 1rem; }
.points li:last-child { border-bottom: 1px solid var(--line); }
.points .mono { color: var(--accent); padding-top: .3rem; }
.points h3 { font: 600 1.25rem/1.2 var(--heading); letter-spacing: -.04em; }
.points p { margin-top: .5rem; color: var(--muted); font-size: .95rem; }

/* faq */
.faq { margin-top: 2.4rem; max-width: 50rem; border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary { display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; padding: 1.3rem 0; cursor: pointer; list-style: none; font: 600 1.1rem var(--heading); letter-spacing: -.03em; transition: color .2s; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary:hover { color: var(--accent); }
.faq summary::after { content: "+"; flex: none; font: 400 1.4rem var(--mono); color: var(--accent); transition: transform .35s var(--ease); }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { padding: 0 3rem 1.4rem 0; color: var(--muted); animation: fade .4s ease-out; }
.faq a { color: var(--accent); border-bottom: 1px solid color-mix(in srgb, var(--accent) 35%, transparent); }

/* cta final */
.cta { margin: 6rem 0 0; }
.cta-box { position: relative; padding: 3.6rem 2.4rem; border: 1px solid var(--line-strong); background: var(--surface); text-align: center; overflow: hidden; }
.cta-box::before { content: ""; position: absolute; inset: 0; background-image: radial-gradient(color-mix(in srgb, var(--text) 14%, transparent) 1px, transparent 1.5px); background-size: 1.8rem 1.8rem; -webkit-mask-image: radial-gradient(ellipse at center, #000 10%, transparent 70%); mask-image: radial-gradient(ellipse at center, #000 10%, transparent 70%); }
.cta-box > * { position: relative; }
.cta-box p { margin: 1rem auto 0; max-width: 32rem; color: var(--muted); }
.cta-box .btn { margin-top: 1.8rem; }

/* ---------- FOOTER ---------- */
.ftr { margin-top: 6rem; border-top: 1px solid var(--line); padding: 2.6rem 0 calc(2.6rem + var(--sab)); }
.ftr .wrap { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1.4rem 2rem; }
.ftr-links { display: flex; flex-wrap: wrap; gap: .6rem 1.8rem; font-size: .8667rem; color: var(--muted); }
.ftr-links a { transition: color .2s; } .ftr-links a:hover { color: var(--accent); }
.ftr small { font: .7333rem var(--mono); letter-spacing: .05em; color: var(--subtle); }

/* ---------- CONTACTO ---------- */
.page-hero { padding: calc(var(--hdr) + 4rem) 0 0; }
.page-hero h1 { margin-top: 0; font-size: clamp(2.3rem, 5vw, 3.6rem); }
.contact { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: 4rem; margin-top: 3.4rem; align-items: start; }
.mail-card { padding: 1.4rem; border: 1px solid var(--line-strong); background: var(--surface); }
.mail-card .mono { color: var(--subtle); text-transform: uppercase; }
.mail-row { display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; margin-top: .6rem; }
.mail-row a { font: 600 1.3rem var(--heading); letter-spacing: -.04em; transition: color .2s; word-break: break-all; }
.mail-row a:hover { color: var(--accent); }
.copy { background: transparent; border: 1px solid var(--line); padding: .35rem .7rem; font: .7333rem var(--mono); letter-spacing: .06em; color: var(--muted); cursor: pointer; transition: color .2s, border-color .2s; }
.copy:hover, .copy.ok { color: var(--accent); border-color: var(--accent); }
.tips { margin-top: 2.2rem; }
.tips h2 { font-size: 1.3rem; letter-spacing: -.04em; }
.tips ul { margin-top: 1rem; display: grid; gap: .6rem; }
.tips li { position: relative; padding-left: 1.4rem; color: var(--muted); }
.tips li::before { content: ""; position: absolute; left: .1rem; top: .8em; width: .5rem; height: 1px; background: var(--accent); box-shadow: 0 0 0 .5px var(--accent); }
.form { display: grid; gap: 1.2rem; padding: 1.8rem; border: 1px solid var(--line); background: var(--surface); }
.field { display: grid; gap: .45rem; }
.field label { font: 500 .7333rem var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--subtle); }
.field input, .field select, .field textarea { width: 100%; padding: .8rem .9rem; background: var(--bg); border: 1px solid var(--line-strong); border-radius: 0; outline: 0; font-size: .95rem; transition: border-color .2s, box-shadow .2s; }
.field textarea { min-height: 9rem; resize: vertical; line-height: 1.6; }
.field select { appearance: none; -webkit-appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--muted) 50%), linear-gradient(135deg, var(--muted) 50%, transparent 50%); background-position: calc(100% - 1.15rem) 55%, calc(100% - .8rem) 55%; background-size: .35rem .35rem; background-repeat: no-repeat; padding-right: 2.4rem; }
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-wash); }
.field input::placeholder, .field textarea::placeholder { color: var(--subtle); }
.field [aria-invalid="true"] { border-color: #ef7b6b; }
.form-foot { display: flex; align-items: center; flex-wrap: wrap; gap: 1rem 1.4rem; }
.form-msg { font-size: .8667rem; color: var(--muted); min-height: 1.4em; }
.form-fallback { font-size: .8667rem; color: var(--subtle); }
.form-fallback a { color: var(--accent); border-bottom: 1px solid color-mix(in srgb, var(--accent) 35%, transparent); }

/* ---------- ANIMACIONES ---------- */
.js .rv { opacity: 0; transform: translateY(1.4rem); transition: opacity .8s var(--ease), transform .8s var(--ease); transition-delay: calc(var(--i, 0) * 90ms); }
.js .rv.in { opacity: 1; transform: none; }
@keyframes rise { from { opacity: 0; transform: translateY(1rem); } to { opacity: 1; transform: none; } }
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }
@keyframes ping { 0% { transform: scale(1); opacity: .6; } 80%, 100% { transform: scale(3.2); opacity: 0; } }
@keyframes blink { 0%, 100% { opacity: 1; } 45% { opacity: .15; } 55% { opacity: 1; } 70% { opacity: .3; } }
@keyframes blink-g { 0%, 100% { opacity: 1; } 60% { opacity: .35; } 72% { opacity: 1; } }
@keyframes scan { from { transform: translateY(-40px); } to { transform: translateY(380px); } }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }
@keyframes marquee { to { transform: translateX(-50%); } }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .js .rv { opacity: 1; transform: none; }
  .steps li::after { transform: scaleX(1); }
}

/* ---------- RESPONSIVE ---------- */
@media (max-width: 960px) {
  .hero .wrap, .why, .contact { grid-template-columns: minmax(0, 1fr); gap: 2.6rem; }
  .rack { margin: 0 auto; max-width: 22rem; }
  .why .sec-head { position: static; }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2.4rem 1.4rem; }
  .steps li:nth-child(2)::after { display: none; }
}
@media (max-width: 760px) {
  :root { --hdr: 4rem; }
  .menu-btn { display: flex; }
  .nav { position: fixed; top: var(--hdr); left: 0; right: 0; bottom: 0; flex-direction: column; align-items: flex-start; gap: 0; padding: 1rem max(1.6rem, var(--sal)) calc(2rem + var(--sab)); background: var(--bg); font-size: 1.4rem; font-family: var(--heading); letter-spacing: -.04em; transform: translateY(-1rem); opacity: 0; visibility: hidden; transition: opacity .3s, transform .4s var(--ease), visibility 0s .4s; margin-left: 0; overflow-y: auto; }
  .menu-open .nav { opacity: 1; transform: none; visibility: visible; transition: opacity .3s, transform .4s var(--ease); }
  .nav a:not(.btn) { width: 100%; padding: 1.1rem 0; border-bottom: 1px solid var(--line); }
  .nav a:not(.btn)::after { display: none; }
  .nav .btn { margin-top: 1.4rem; font: 600 1rem var(--body); letter-spacing: 0; }
  .hdr .wrap { gap: 1rem; } #themeBtn { margin-left: auto; }
  .hero { padding-top: calc(var(--hdr) + 2.6rem); padding-bottom: 3rem; }
  .sec { padding-top: 4.4rem; }
  .cards { grid-template-columns: minmax(0, 1fr); }
  .steps { grid-template-columns: minmax(0, 1fr); gap: 1.8rem; }
  .steps li { padding: 0 0 0 3.6rem; min-height: 2.5rem; }
  .steps li::after { display: none; }
  .cta-box { padding: 2.6rem 1.4rem; }
  .faq details p { padding-right: 0; }
  .form { padding: 1.3rem; }
}

/* el menú móvil es "fixed": el header no puede tener backdrop-filter mientras está abierto (crearía un contenedor propio y lo recortaría) */
.menu-open .hdr, .menu-open .hdr.is-scrolled { backdrop-filter: none; -webkit-backdrop-filter: none; background: var(--bg); }