:root {
  color-scheme: light;
  --bg: #f6fbf9;
  --surface: #ffffff;
  --surface-soft: #eaf7f2;
  --surface-warm: #fff8e8;
  --text: #17332f;
  --muted: #647a74;
  --line: #d8e9e3;
  --accent: #1c8b7c;
  --accent-strong: #11695f;
  --accent-soft: #ddf4ed;
  --blue-soft: #eaf2ff;
  --sand-soft: #fff3d9;
  --violet-soft: #f1edff;
  --focus: #b65e18;
  --shadow: 0 14px 36px rgba(31, 83, 74, .10);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: linear-gradient(180deg, #fcfffe 0, var(--bg) 38rem); color: var(--text); line-height: 1.6; }
a { color: inherit; }
.shell { width: min(1120px, calc(100% - 2rem)); margin-inline: auto; }
.narrow { width: min(760px, calc(100% - 2rem)); }
.skip-link { position: absolute; left: -9999px; top: 0; background: var(--text); color: white; padding: .75rem 1rem; z-index: 10; border-radius: .6rem; }
.skip-link:focus { left: .75rem; top: .75rem; }
.site-header { border-bottom: 1px solid var(--line); background: rgba(255,255,255,.9); backdrop-filter: blur(12px); }
.header-row { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.brand { font-weight: 900; text-decoration: none; letter-spacing: -.03em; color: var(--accent-strong); }
nav { display: flex; flex-wrap: wrap; gap: .9rem; font-size: .95rem; }
nav a { text-underline-offset: .22em; }
.hero { padding-block: 4.8rem 4rem; }
.hero-grid { display: grid; gap: 3rem; align-items: center; }
.hero-copy { min-width: 0; }
.eyebrow { color: var(--accent); font-weight: 850; text-transform: uppercase; letter-spacing: .09em; font-size: .77rem; }
h1 { max-width: 860px; font-size: clamp(2.35rem, 7vw, 5.1rem); line-height: .98; letter-spacing: -.052em; margin: .55rem 0 1rem; }
h2 { font-size: clamp(1.6rem, 4vw, 2.35rem); line-height: 1.12; letter-spacing: -.03em; }
h3 { line-height: 1.2; }
.lead { max-width: 720px; font-size: 1.14rem; color: var(--muted); }
.button { display: inline-block; margin-top: 1rem; padding: .9rem 1.1rem; border-radius: .9rem; border: 1px solid transparent; background: var(--accent); color: white; font-weight: 800; text-decoration: none; cursor: pointer; box-shadow: 0 6px 18px rgba(28,139,124,.18); }
.button:hover { background: var(--accent-strong); }
.button-secondary { background: white; color: var(--accent-strong); border-color: var(--line); box-shadow: none; }
.button-secondary:hover { background: var(--accent-soft); }
.text-link { color: var(--accent-strong); font-weight: 800; text-decoration: none; }
.text-link:hover { text-decoration: underline; text-underline-offset: .2em; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem 1.2rem; margin-top: .4rem; }
.hero-actions .button { margin-top: 0; }
.trust-row { display: flex; flex-wrap: wrap; gap: .55rem; margin-top: 1.35rem; }
.trust-row span { padding: .42rem .65rem; border-radius: 999px; background: white; border: 1px solid var(--line); color: var(--muted); font-size: .86rem; font-weight: 700; }
.spool-visual { position: relative; min-height: 390px; border-radius: 2rem; background: radial-gradient(circle at 38% 30%, #ffffff 0 12%, transparent 13%), linear-gradient(145deg, #e8f7f1, #fdf8ea); border: 1px solid #d9ece6; box-shadow: 0 26px 70px rgba(30,79,69,.12); overflow: hidden; display: grid; place-items: center; }
.spool-shell { width: 215px; height: 215px; border-radius: 50%; background: linear-gradient(145deg, #f3f6f5, #cfd9d6); box-shadow: inset -12px -16px 25px rgba(30,66,60,.12), 0 18px 35px rgba(26,70,63,.14); display: grid; place-items: center; position: relative; }
.spool-shell::before, .spool-shell::after { content: ""; position: absolute; border-radius: 50%; }
.spool-shell::before { width: 165px; height: 165px; background: repeating-radial-gradient(circle, #5eb7a7 0 4px, #77c7b8 5px 8px); box-shadow: inset 0 0 0 9px rgba(255,255,255,.42); }
.spool-shell::after { width: 82px; height: 82px; background: #eff4f2; box-shadow: inset 0 0 0 14px #d1dcda; }
.spool-core { width: 28px; height: 28px; border-radius: 50%; background: #8d9f9a; position: relative; z-index: 2; }
.spool-label { position: absolute; z-index: 3; padding: .62rem .8rem; border-radius: .85rem; background: rgba(255,255,255,.94); box-shadow: var(--shadow); font-weight: 850; font-size: .9rem; }
.spool-label-a { top: 15%; left: 8%; transform: rotate(-4deg); }
.spool-label-b { top: 24%; right: 8%; transform: rotate(5deg); background: #fff7dc; }
.spool-caption { position: absolute; left: 1.2rem; right: 1.2rem; bottom: 1.2rem; display: flex; justify-content: space-between; gap: 1rem; align-items: center; padding: .9rem 1rem; border-radius: 1rem; background: rgba(255,255,255,.88); backdrop-filter: blur(8px); }
.spool-caption span { color: var(--muted); font-size: .9rem; }
.section { padding-block: 3.5rem; }
.section-muted { padding-block: 3.2rem; background: var(--surface-soft); border-block: 1px solid var(--line); }
.section-heading { display: flex; justify-content: space-between; align-items: end; gap: 1.2rem; margin-bottom: 1.5rem; }
.section-heading h2 { margin: .25rem 0 0; }
.section-heading > p { max-width: 430px; color: var(--muted); margin: 0; }
.cards { display: grid; gap: 1rem; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 1.2rem; padding: 1.35rem; box-shadow: var(--shadow); }
.card h3 { margin: 0 0 .42rem; }
.card p { margin: 0; color: var(--muted); }
.card-link { display: block; text-decoration: none; transition: transform .16s ease, border-color .16s ease, box-shadow .16s ease; }
.card-link:hover { transform: translateY(-3px); border-color: #a6d7cc; box-shadow: 0 18px 42px rgba(27,78,69,.14); }
.tool-cards .card { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 1rem; min-height: 140px; }
.card-icon { width: 3.25rem; height: 3.25rem; border-radius: 1rem; display: grid; place-items: center; font-size: 1.45rem; font-weight: 900; background: var(--accent-soft); color: var(--accent-strong); }
.card-backing .card-icon { background: var(--sand-soft); color: #9d6418; }
.card-decoder .card-icon { background: var(--blue-soft); color: #4266a9; }
.card-winding .card-icon { background: var(--violet-soft); color: #6954a7; }
.card-arrow { font-size: 1.35rem; color: var(--muted); transition: transform .16s ease; }
.card-link:hover .card-arrow { transform: translateX(4px); }
.compact-cards .card { min-height: 120px; }
.compact-cards h3 { margin-top: .7rem; }
.mini-tag { display: inline-block; padding: .3rem .55rem; border-radius: 999px; background: var(--accent-soft); color: var(--accent-strong); font-size: .76rem; font-weight: 800; }
.journey { overflow: hidden; }
.journey-grid { display: grid; gap: .8rem; align-items: center; }
.journey-step { display: grid; grid-template-columns: auto 1fr; gap: .1rem .8rem; align-items: center; padding: .9rem 1rem; background: rgba(255,255,255,.75); border: 1px solid rgba(203,228,220,.9); border-radius: 1rem; }
.journey-step > span { grid-row: 1 / 3; width: 2.25rem; height: 2.25rem; border-radius: 50%; display: grid; place-items: center; background: var(--accent); color: white; font-weight: 900; }
.journey-step small { color: var(--muted); }
.journey-line { display: none; height: 2px; background: linear-gradient(90deg, var(--accent), #b8ddd4); }
.method-section { padding-block: 4rem; }
.principle-grid { display: grid; gap: 1rem; }
.principle-grid article { padding: 1.3rem; border-radius: 1.2rem; border: 1px solid var(--line); background: white; }
.principle-grid h3 { margin: .8rem 0 .35rem; }
.principle-grid p { margin: 0; color: var(--muted); }
.principle-icon { width: 2.4rem; height: 2.4rem; display: grid; place-items: center; border-radius: .8rem; background: var(--accent-soft); color: var(--accent-strong); font-weight: 900; }
.note { border-left: 4px solid var(--accent); padding: .8rem 1rem; background: var(--surface-warm); border-radius: 0 .7rem .7rem 0; }
.site-footer { border-top: 1px solid var(--line); color: var(--muted); padding-block: 1.7rem; font-size: .9rem; background: rgba(255,255,255,.65); }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }
@media (min-width: 720px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
  .hero-grid { grid-template-columns: minmax(0, 1.1fr) minmax(360px, .9fr); }
  .journey-grid { grid-template-columns: 1fr 70px 1fr 70px 1fr; }
  .journey-line { display: block; }
  .principle-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 640px) {
  .header-row { align-items: flex-start; padding-block: .8rem; flex-direction: column; }
  .hero { padding-block: 3.2rem 2.8rem; }
  .spool-visual { min-height: 320px; }
  .spool-shell { width: 175px; height: 175px; }
  .spool-shell::before { width: 135px; height: 135px; }
  .spool-shell::after { width: 68px; height: 68px; }
  .section-heading { align-items: flex-start; flex-direction: column; }
  .tool-cards .card { grid-template-columns: auto 1fr; min-height: 124px; }
  .tool-cards .card-arrow { display: none; }
  .spool-caption { flex-direction: column; align-items: flex-start; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .card-link, .card-arrow { transition: none; } }