:root {
  --night: #0e1726;
  --night-2: #16223a;
  --teal: #22d3b6;
  --teal-dark: #0f9e88;
  --orange: #f5a524;
  --paper: #ffffff;
  --mist: #f3f6f9;
  --ink: #0e1726;
  --muted: #5b6678;
  --line: #e1e6ee;
  --red: #e5484d;
  --radius: 16px;
  --max: 1160px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body { margin: 0; font-family: var(--font); font-size: 17px; line-height: 1.6; color: var(--ink); background: var(--paper); -webkit-font-smoothing: antialiased; }
img, svg { max-width: 100%; display: block; }
a { color: inherit; }
[hidden] { display: none !important; }

h1, h2, h3 { line-height: 1.06; margin: 0 0 .5em; font-weight: 800; letter-spacing: -0.03em; text-wrap: balance; }
h1 { font-size: clamp(2.4rem, 5.4vw, 4rem); }
h2 { font-size: clamp(1.8rem, 3.4vw, 2.5rem); }
h3 { font-size: 1.12rem; letter-spacing: -0.01em; line-height: 1.3; }
p { margin: 0 0 1em; }

.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 20px; }
.hl { color: var(--teal); }
.eyebrow { font-family: var(--mono); font-size: .78rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--teal); margin-bottom: .9em; }
.eyebrow-dark { color: var(--teal-dark); }
.lead { font-size: 1.12rem; color: var(--muted); max-width: 34em; }

.announce { margin: 0; background: var(--orange); color: var(--night); text-align: center; font-weight: 700; font-size: .84rem; padding: 8px 16px; }

.btn { display: inline-block; padding: .85em 1.6em; border-radius: 10px; background: var(--teal); color: var(--night); font: inherit; font-weight: 800; text-decoration: none; border: 2px solid var(--teal); cursor: pointer; transition: background .15s, transform .15s; }
.btn:hover { background: #4de2c9; border-color: #4de2c9; transform: translateY(-1px); }
.btn:disabled { background: #c9d2dd; border-color: #c9d2dd; color: #6b7686; cursor: not-allowed; transform: none; }
.btn-ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,.45); }
.btn-ghost:hover { background: rgba(255,255,255,.1); border-color: #fff; }
.btn-dark { background: var(--night); border-color: var(--night); color: #fff; }
.btn-dark:hover { background: var(--night-2); border-color: var(--night-2); }
.btn-small { padding: .5em 1.1em; font-size: .92rem; }
.btn-full { width: 100%; text-align: center; }
.btn:focus-visible, .algo:focus-visible, .chip:focus-visible, input:focus-visible, summary:focus-visible { outline: 3px solid var(--orange); outline-offset: 3px; }

.site-header { position: sticky; top: 0; z-index: 10; background: var(--night); color: #fff; border-bottom: 1px solid #22304a; }
.header-inner { display: flex; align-items: center; height: 70px; gap: 24px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.wordmark { font-size: 1.35rem; font-weight: 900; letter-spacing: .04em; }
.wordmark b { color: var(--teal); font-weight: 500; margin-left: .3em; letter-spacing: .18em; font-size: .9em; }
.nav { display: flex; gap: 24px; margin-left: auto; }
.nav a { text-decoration: none; font-weight: 600; font-size: .94rem; color: rgba(255,255,255,.72); }
.nav a:hover { color: var(--teal); }

.hero { padding: 64px 0 72px; color: #fff; background:
  linear-gradient(rgba(34,211,182,.06) 1px, transparent 1px) 0 0 / 32px 32px,
  linear-gradient(90deg, rgba(34,211,182,.06) 1px, transparent 1px) 0 0 / 32px 32px,
  radial-gradient(circle at 80% 30%, var(--night-2), var(--night) 65%); }
.hero-inner { display: grid; grid-template-columns: 1.15fr .85fr; align-items: center; gap: 48px; }
.hero .lead { color: rgba(255,255,255,.8); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.rack { display: grid; gap: 12px; background: #0a111d; border: 2px solid #22304a; border-radius: 18px; padding: 18px; box-shadow: 0 30px 60px rgba(0,0,0,.45); }
.unit { display: flex; align-items: center; gap: 10px; height: 58px; padding: 0 14px; border-radius: 10px; background: linear-gradient(180deg, #1c2a44, #142036); border: 1px solid #2a3a58; }
.led { width: 8px; height: 8px; border-radius: 50%; background: var(--teal); box-shadow: 0 0 8px var(--teal); animation: blink 1.6s infinite; }
.led + .led { background: var(--orange); box-shadow: 0 0 8px var(--orange); animation-delay: .6s; }
.unit:nth-child(2) .led { animation-delay: .3s; } .unit:nth-child(3) .led { animation-delay: .9s; } .unit:nth-child(4) .led { animation-delay: 1.2s; }
@keyframes blink { 50% { opacity: .35; } }
.fan { margin-left: auto; width: 38px; height: 38px; border-radius: 50%; border: 3px solid #2f4262; background: repeating-conic-gradient(#2f4262 0 30deg, #142036 30deg 60deg); animation: spin 2s linear infinite; }
.fan + .fan { margin-left: 0; }
@keyframes spin { to { transform: rotate(360deg); } }

.facts { background: var(--night-2); color: #fff; }
.facts-inner { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; padding-top: 24px; padding-bottom: 24px; }
.facts-inner > div { display: flex; flex-direction: column; border-left: 3px solid var(--teal); padding-left: 14px; }
.facts strong { font-size: 1.05rem; }
.facts span { font-size: .9rem; color: rgba(255,255,255,.7); }

.section { padding: 80px 0; }
.section-alt { background: var(--mist); }
.section-dark { background: var(--night); color: #fff; }
.section-dark .lead { color: rgba(255,255,255,.8); }

.rent { display: grid; grid-template-columns: 1.2fr .8fr; gap: 40px; align-items: start; }
fieldset { border: 0; padding: 0; margin: 0 0 24px; }
legend { font-weight: 800; font-size: .95rem; margin-bottom: 10px; padding: 0; }
.algos { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.algo { font: inherit; text-align: left; display: flex; flex-direction: column; padding: 16px 18px; border-radius: 12px; border: 2px solid var(--line); background: #fff; color: var(--ink); cursor: pointer; }
.algo strong { font-family: var(--mono); font-size: 1.05rem; }
.algo span { color: var(--muted); font-size: .92rem; }
.algo:hover { border-color: var(--teal-dark); }
.algo.is-active { border-color: var(--teal-dark); background: #e8fbf7; box-shadow: inset 5px 0 0 var(--teal); }
.slider-row { display: flex; align-items: center; gap: 16px; }
input[type=range] { flex: 1; accent-color: var(--teal-dark); height: 32px; }
output { min-width: 112px; text-align: right; font-family: var(--mono); font-weight: 700; font-size: 1.1rem; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { font: inherit; font-weight: 700; padding: .6em 1.15em; border-radius: 10px; border: 2px solid var(--line); background: #fff; color: var(--ink); cursor: pointer; }
.chip:hover { border-color: var(--night); }
.chip.is-active { background: var(--night); border-color: var(--night); color: #fff; }

.summary { position: sticky; top: 92px; background: var(--night); color: #fff; border-radius: 18px; padding: 24px; }
.summary-head { margin: 0 0 12px; font-family: var(--mono); font-size: .78rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--teal); }
.summary dl { margin: 0; display: grid; gap: 8px; }
.summary dl div { display: flex; justify-content: space-between; gap: 10px; padding-bottom: 8px; border-bottom: 1px dashed #2a3a58; font-size: .93rem; }
.summary dt { color: rgba(255,255,255,.65); }
.summary dd { margin: 0; font-weight: 700; text-align: right; font-family: var(--mono); font-size: .88rem; }
.summary-total { display: flex; justify-content: space-between; align-items: baseline; margin: 16px 0 4px; }
.summary-total span { font-weight: 700; }
.summary-total strong { font-size: 2rem; font-weight: 900; color: var(--teal); font-family: var(--mono); }
.summary-incl { color: rgba(255,255,255,.65); font-size: .86rem; }
.warn { background: rgba(245,165,36,.12); border: 1px solid rgba(245,165,36,.45); border-radius: 12px; padding: 12px 14px; font-size: .88rem; color: rgba(255,255,255,.88); margin-bottom: 14px; }
.warn strong { display: block; color: var(--orange); margin-bottom: 2px; }
.ack { display: flex; gap: 10px; align-items: flex-start; font-size: .9rem; margin-bottom: 14px; cursor: pointer; }
.ack input { width: 18px; height: 18px; margin-top: 2px; accent-color: var(--teal); flex: none; }

.steps { list-style: none; margin: 30px 0 0; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.steps li { background: #fff; border-radius: var(--radius); padding: 22px 20px; }
.steps p { margin: 0; color: var(--muted); }
.step-num { display: grid; place-items: center; width: 42px; height: 42px; border-radius: 10px; background: var(--night); color: var(--teal); font-family: var(--mono); font-weight: 700; margin-bottom: 12px; }
.dual { margin-top: 22px; background: #fff; border-left: 4px solid var(--orange); border-radius: 0 var(--radius) var(--radius) 0; padding: 20px 22px; }
.dual p { margin: 0; color: var(--muted); }

.risks { display: grid; grid-template-columns: .9fr 1.1fr; gap: 56px; align-items: start; }
.risk-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.risk-list li { display: flex; flex-direction: column; background: var(--night-2); border-left: 4px solid var(--red); border-radius: 0 14px 14px 0; padding: 16px 20px; }
.risk-list strong { font-size: 1.05rem; }
.risk-list span { color: rgba(255,255,255,.75); }

.faq { display: grid; grid-template-columns: .9fr 1.1fr; gap: 56px; align-items: start; }
.faq .lead { margin-bottom: 1.4em; }
.faq-list { display: grid; gap: 10px; }
.faq-list details { background: var(--mist); border-radius: 14px; padding: 2px 20px; }
.faq-list summary { cursor: pointer; font-weight: 800; padding: 15px 0; list-style: none; display: flex; justify-content: space-between; gap: 12px; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; font-size: 1.4rem; line-height: 1; color: var(--teal-dark); }
.faq-list details[open] summary::after { content: "–"; }
.faq-list p { margin: 0 0 16px; color: var(--muted); }

.site-footer { background: var(--night); color: rgba(255,255,255,.72); font-size: .88rem; border-top: 1px solid #22304a; }
.footer-inner { display: flex; align-items: flex-start; gap: 16px; padding-top: 24px; padding-bottom: 24px; }
.footer-inner img { flex: none; }
.footer-inner p { margin: 0 0 .5em; }
.legal { font-size: .82rem; color: rgba(255,255,255,.55); max-width: 62em; margin: 0 !important; }

@media (max-width: 1000px) {
  .nav { display: none; }
  .header-inner .btn-small { margin-left: auto; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .facts-inner { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 880px) {
  .hero-inner, .rent, .risks, .faq { grid-template-columns: 1fr; gap: 34px; }
  .rack { max-width: 420px; width: 100%; }
  .summary { position: static; }
  .section { padding: 60px 0; }
}
@media (max-width: 600px) {
  .container { padding: 0 16px; }
  .announce { font-size: .76rem; }
  .algos, .steps { grid-template-columns: 1fr; }
  output { min-width: 96px; font-size: 1rem; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; animation: none !important; }
}