/* HelloNavi — a small, sunny corner of the internet. */
:root {
  color-scheme: light;
  --ink: #174c64;
  --muted: #386278;
  --blue: #0877a9;
  --sans: "Trebuchet MS", Tahoma, "PingFang SC", "Microsoft YaHei", sans-serif;
  --focus: #064c7d;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 28px; }
body {
  margin: 0;
  min-width: 280px;
  color: var(--ink);
  background: #d9f0ed;
  font: 15px/1.7 var(--sans);
  -webkit-font-smoothing: antialiased;
  isolation: isolate;
}
body::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 1180px;
  z-index: -2;
  background: linear-gradient(180deg, #e6faff12 0%, #eafbf02e 66%, #d9f0ed 100%),
    url("./assets/aero-landscape.webp") center top / cover no-repeat;
  pointer-events: none;
}
h1, h2, h3, p { margin: 0; }
a { color: inherit; text-decoration: none; -webkit-tap-highlight-color: transparent; }
a:focus-visible { outline: 3px solid var(--focus); outline-offset: 5px; }
::selection { color: #103b52; background: #b5eaaa; }
.page-shell { width: min(1120px, calc(100% - 80px)); margin: 32px auto 0; }
.skip-link { position: fixed; z-index: 10; top: 12px; left: 12px; padding: 10px 18px; border-radius: 12px; background: #fff; color: var(--ink); transform: translateY(-170%); }
.skip-link:focus { transform: none; }

/* Opaque fallbacks remain legible without backdrop-filter. */
.site-header {
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  min-height: 76px; padding: 12px 25px 12px 20px;
  border: 1px solid #ffffffec; border-radius: 22px;
  background: linear-gradient(#f9ffff, #dff3f8);
  box-shadow: 0 10px 30px #17628b16, inset 0 1px 0 #fff, inset 0 -1px 0 #9bc6d964;
}
.wordmark { display: inline-flex; align-items: center; gap: 11px; font-size: 23px; font-weight: 700; letter-spacing: -1.1px; border-radius: 8px; }
.wordmark-dot { color: #3c8548; }
.brand-mark {
  position: relative; display: flex; align-items: center; justify-content: center;
  width: 44px; height: 44px; border: 1px solid #fff; border-radius: 50%; color: #fff;
  background: radial-gradient(ellipse at 35% 12%, #fff 0%, #d7fbff 10%, transparent 43%), linear-gradient(145deg, #a4ebbd 5%, #2195b7 50%, #005a9a 77%, #7ad8ea);
  box-shadow: inset 0 -3px 5px #064f8b66, 0 2px 4px #255b7a36;
  font: italic 700 31px/1 Georgia, serif; padding: 0 4px 5px 0; text-shadow: 0 1px 3px #0b5b7d;
}
.brand-mark span { color: #ddffb6; }
.site-header nav { display: flex; align-items: center; gap: 10px; font-size: 13px; font-weight: 700; }
.site-header nav a { display: inline-flex; align-items: center; gap: 9px; padding: 8px 17px; border-radius: 18px; transition: background 180ms, box-shadow 180ms; }
.site-header nav .nav-home { background: linear-gradient(#fff, #d8edf5); box-shadow: inset 0 0 0 1px #b7d5e2, 0 1px 0 #fff; }
.site-header nav a:hover { background: #fff; box-shadow: inset 0 0 0 1px #8db8c9; }

.hero {
  display: grid; grid-template-columns: 1fr 1fr; align-items: center; position: relative;
  min-height: 563px; margin-top: 22px; padding: 47px 55px 49px;
  border: 1px solid #fffffff0; border-radius: 30px;
  background: linear-gradient(105deg, #f3fcff 0%, #e2f5fb 58%, #d4eef1 100%);
  box-shadow: 0 14px 50px #206b8b19, inset 0 1px 0 #fff, inset 0 -1px 0 #a2d4dc80;
}
.hero-copy { position: relative; z-index: 1; }
.eyebrow { display: flex; align-items: center; gap: 10px; font-size: 11px; font-weight: 700; letter-spacing: 2.2px; color: var(--muted); }
.little-spark { width: 9px; height: 9px; border-radius: 50%; background: radial-gradient(circle at 32% 24%, #efffe4 3%, #8ecf56 35%, #437c33); box-shadow: 0 0 0 4px #e4f4dd; }
h1 { font-size: clamp(74px, 7.8vw, 108px); line-height: .99; letter-spacing: -6px; font-weight: 700; margin-top: 24px; color: #145674; text-shadow: 0 2px 0 #fff; }
.name { display: inline-block; margin-top: 3px; color: #087cac; }
.title-dot { color: #458344; }
.hero-subtitle { margin-top: 23px; font-size: 23px; font-weight: 700; letter-spacing: 2px; }
.hero-description { margin-top: 12px; color: var(--muted); font-size: 14px; line-height: 1.9; letter-spacing: .3px; }
.explore-link {
  display: inline-flex; align-items: center; gap: 28px; position: relative;
  margin-top: 25px; padding: 10px 12px 10px 23px; border: 1px solid #0875a1; border-radius: 28px;
  background: linear-gradient(#ffffff6b, #ffffff00 50%), linear-gradient(#087cae 0%, #05658f 49%, #00547e 50%, #0875a0 100%);
  color: #fff; box-shadow: inset 0 1px 0 #d8faff, inset 0 -1px 1px #004571, 0 4px 8px #125c8326;
  font-size: 13px; font-weight: 700; text-shadow: 0 1px 1px #003d64; transition: transform 180ms, box-shadow 180ms;
}
.explore-link > span { display: grid; place-items: center; width: 26px; height: 26px; border-radius: 50%; border: 1px solid #bdebf68a; background: #07567c6b; font-size: 18px; line-height: 1; }
.explore-link:hover { transform: translateY(-2px); box-shadow: inset 0 1px 0 #fff, 0 6px 14px #125c8340; }

/* Code-native glass sculpture: no canvas, script, or animated background. */
.aero-art { position: relative; width: 100%; aspect-ratio: 1; max-width: 445px; justify-self: end; isolation: isolate; }
.orb-halo { position: absolute; width: 80%; height: 16%; border-radius: 50%; bottom: 7%; left: 8%; background: radial-gradient(ellipse, #0c94bf26, #67cedc0a 55%, transparent 70%); border: 1px solid #ffffff8c; transform: rotate(-8deg); }
.glass-orb {
  position: absolute; inset: 8% 11% 14% 11%; overflow: hidden;
  border: 1px solid #ffffffdc; border-radius: 50%;
  background: radial-gradient(ellipse at 46% 78%, #bdffd3a8, transparent 45%), radial-gradient(circle at 37% 28%, #d3faff7a 5%, #98e4ed42 34%, #23a1c96b 69%, #86ebed 95%);
  box-shadow: inset 10px 6px 16px #ffffffa8, inset -11px -10px 22px #137caa7d, inset 1px -6px 5px #cbffff, 12px 25px 28px #15738c26;
}
.orb-grid { position: absolute; inset: 8%; border-radius: 50%; border: 1px solid #ffffff7a; transform: rotate(-22deg) scaleX(.56); box-shadow: 0 0 10px #e7ffff40; }
.orb-grid::before, .orb-grid::after { content: ""; position: absolute; border: 1px solid #ffffff70; border-radius: 50%; inset: 15% -38%; }
.orb-grid::after { inset: 32% -40%; }
.orb-leaf { position: absolute; box-shadow: inset -7px -8px 14px #287b454f, inset 4px 5px 8px #e4ffb994; }
.leaf-one { width: 50%; height: 37%; left: 19%; bottom: 23%; border-radius: 5% 90% 5% 90%; transform: rotate(12deg); background: linear-gradient(150deg, #edffb3cc, #97db5ccd 48%, #398854c9); }
.leaf-two { width: 36%; height: 28%; right: 11%; bottom: 39%; border-radius: 90% 5% 90% 5%; transform: rotate(-9deg); background: linear-gradient(145deg, #eaffbddd, #a2e477aa 40%, #3e9f73d9); }
.orb-leaf::after { content: ""; position: absolute; width: 85%; height: 1px; background: #edffd4a6; top: 51%; left: 8%; transform: rotate(31deg); }
.leaf-two::after { transform: rotate(-35deg); }
.orb-shine { position: absolute; top: 5%; left: 11%; width: 75%; height: 44%; border-radius: 50%; transform: rotate(-19deg); background: linear-gradient(#fffffff5, #ffffff48 55%, #ffffff00); }
.orb-glint { position: absolute; width: 40%; height: 10%; bottom: 6%; left: 27%; border-radius: 50%; background: #dcffffb5; filter: blur(5px); transform: rotate(-12deg); }
.small-orb { position: absolute; border-radius: 50%; border: 1px solid #ffffffd9; }
.green-orb { width: 76px; height: 76px; bottom: 17%; left: 0; background: radial-gradient(ellipse at 35% 17%, #fff 1%, #edffd4 13%, #92d44c 45%, #318754 77%, #a5ef99); box-shadow: inset 0 -3px 6px #257b6a7d, 3px 9px 12px #265c5c25; }
.clear-orb { width: 39px; height: 39px; right: 3%; bottom: 23%; background: radial-gradient(circle at 30% 20%, #fff 2%, #ffffff18 35%, #32a4d333 60%, #cffbff 97%); box-shadow: inset -3px -3px 5px #1a98b74d, 2px 4px 8px #236a8b1a; }
.water-drop { position: absolute; width: 44px; height: 60px; right: 7%; top: 2%; border-radius: 70% 30% 60% 40% / 65% 30% 70% 35%; transform: rotate(-25deg); border: 1px solid #ffffffdb; background: radial-gradient(ellipse at 30% 28%, #fff 2%, #d6faff70 23%, #1da6ce80 70%, #d1fffa); box-shadow: inset -4px -4px 7px #1e83b666, 3px 6px 8px #24687f1a; }
.art-spark { position: absolute; width: 20px; height: 20px; background: #fff; clip-path: polygon(50% 0, 58% 42%, 100% 50%, 58% 58%, 50% 100%, 42% 58%, 0 50%, 42% 42%); }
.spark-one { top: 21%; left: 6%; }
.spark-two { right: 11%; bottom: 13%; width: 12px; height: 12px; }
.art-caption { position: absolute; bottom: -1%; left: 0; right: 0; text-align: center; font-size: 9px; font-weight: 700; letter-spacing: 2.8px; color: #315e72; }

.space-section { padding: 30px 0 0; scroll-margin-top: 20px; }
.section-heading { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; margin-bottom: 17px; padding: 18px 25px; border: 1px solid #ffffffe8; border-radius: 18px; background: #f1fbf5; box-shadow: 0 4px 20px #276b7810; }
.section-heading .eyebrow { font-size: 9px; letter-spacing: 2.5px; }
h2 { font-size: 23px; font-weight: 700; letter-spacing: 1px; margin-top: 2px; }
.section-caption { font-size: 12px; padding-bottom: 3px; color: var(--muted); }
.space-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; }
.space-card { position: relative; display: flex; flex-direction: column; min-width: 0; padding: 22px 26px 18px; border: 1px solid #ffffffed; border-radius: 23px; background: linear-gradient(135deg, #f6fdff, #dceff8); box-shadow: inset 0 1px 0 #fff, inset 0 -1px 0 #8ec9de70, 0 8px 25px #246e8a1c; transition: transform 180ms, box-shadow 180ms; }
.tasks-card { background: linear-gradient(135deg, #fcfff7, #e2f1d4); box-shadow: inset 0 1px 0 #fff, inset 0 -1px 0 #adc88b80, 0 8px 25px #2769401a; }
.space-card::before { content: ""; position: absolute; top: 1px; left: 14px; right: 14px; height: 1px; background: linear-gradient(90deg, transparent, #fff 30%, #fff 70%, transparent); }
.space-card:hover { transform: translateY(-3px); box-shadow: inset 0 1px 0 #fff, 0 12px 26px #246e8a30; }
.card-top { display: flex; align-items: center; justify-content: space-between; gap: 15px; }
.card-category { font-size: 10px; font-weight: 700; letter-spacing: 1.3px; color: var(--muted); }
.card-number { color: #4b7182; font-size: 12px; letter-spacing: 1px; }
.card-content { display: flex; align-items: center; gap: 25px; padding: 24px 0 25px; }
.card-icon { position: relative; flex: 0 0 74px; width: 74px; height: 74px; border: 1px solid #efffff; border-radius: 19px; box-shadow: inset 0 1px 2px #fff, inset 0 -4px 7px #00568766, 0 4px 7px #1a648133; }
.card-icon::after { content: ""; position: absolute; top: 3px; left: 4px; right: 4px; height: 35px; border-radius: 15px 15px 45% 45%; background: linear-gradient(#fffffff2, #ffffff26); pointer-events: none; }
.math-icon { background: linear-gradient(145deg, #7ce4ff, #087ebc 62%, #00558b); }
.math-icon span { position: absolute; inset: -3px 0 0; text-align: center; color: #fff; font: italic 65px/1.1 Georgia, serif; text-shadow: 0 2px 3px #006190; z-index: 1; }
.math-icon i { position: absolute; width: 40px; height: 1px; left: 16px; bottom: 14px; background: #c0f4ffb3; transform: rotate(-14deg); }
.tasks-icon { display: flex; flex-direction: column; justify-content: center; gap: 9px; padding-left: 33px; background: linear-gradient(145deg, #ceef83, #71b636 57%, #358352); box-shadow: inset 0 1px 2px #fff, inset 0 -4px 7px #246a466e, 0 4px 7px #33764733; }
.tasks-icon i { position: relative; z-index: 1; width: 23px; height: 3px; border-radius: 2px; background: #f9ffec; box-shadow: 0 1px 1px #477d46; }
.tasks-icon i:last-child { width: 17px; }
.tasks-icon i::before { content: ""; position: absolute; left: -15px; top: -3px; width: 8px; height: 8px; border: 1.5px solid #fff; border-radius: 2px; }
.tasks-icon i:first-child::before { height: 5px; border-top: 0; border-right: 0; border-radius: 0; transform: rotate(-45deg); }
.card-copy { min-width: 0; }
.card-content h3 { font-size: 23px; font-weight: 700; letter-spacing: .6px; }
.tasks-card h3 { color: #315d3b; }
.card-content p { margin-top: 7px; font-size: 12px; line-height: 1.9; color: var(--muted); }
.card-bottom { margin-top: auto; display: flex; align-items: center; justify-content: space-between; gap: 14px; border-top: 1px solid #adcbd5; padding-top: 12px; font-size: 12px; color: #2f6079; }
.tasks-card .card-bottom { border-color: #b7cfac; color: #385d3d; }
.card-arrow { display: grid; place-items: center; flex: 0 0 30px; width: 30px; height: 30px; border: 1px solid #a5cad9; border-radius: 50%; background: linear-gradient(#fff, #daedf5); box-shadow: 0 1px 2px #28668313; font-size: 18px; line-height: 1; transition: transform 180ms; }
.tasks-card .card-arrow { border-color: #a9c391; background: linear-gradient(#fff, #dfefce); }
.space-card:hover .card-arrow { transform: translate(2px, -2px); }
.site-footer { display: flex; align-items: center; justify-content: space-between; gap: 20px; min-height: 105px; padding: 23px 8px; color: #325e6b; font-size: 11px; }
.footer-name { color: #1e5265; font-size: 17px; font-weight: 700; letter-spacing: -.5px; }
.site-footer p { letter-spacing: 1px; }
.site-footer a { padding: 8px 6px; border-radius: 8px; }
.site-footer a:hover { background: #ffffff80; }
.site-footer a span { margin-left: 10px; }

@supports ((backdrop-filter: blur(10px)) or (-webkit-backdrop-filter: blur(10px))) {
  .site-header { background: linear-gradient(#ffffffeb, #e7f6f9d9); -webkit-backdrop-filter: blur(18px); backdrop-filter: blur(18px); }
  .hero { background: linear-gradient(105deg, #f4fcfff5 0%, #f0fcffed 39%, #e4f8fba8 69%, #dbf6ed80 100%); -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px); }
  .section-heading { background: #f5fcf5e8; -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px); }
  .space-card { background: linear-gradient(135deg, #f8fefff5, #e0f2f9ed); -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px); }
  .tasks-card { background: linear-gradient(135deg, #fdfff6f5, #e5f3d8ed); }
}
@media (min-width: 1600px) { body::before { background-size: 100% auto; } }
@media (max-width: 1000px) {
  .page-shell { width: calc(100% - 48px); margin-top: 24px; }
  .hero { padding: 42px 36px; min-height: 530px; gap: 6px; }
  h1 { font-size: 86px; letter-spacing: -5px; }
  .card-content { gap: 17px; }
  .space-card { padding: 20px 21px 16px; }
  .card-icon { width: 62px; height: 62px; flex-basis: 62px; border-radius: 16px; }
  .card-icon::after { height: 29px; border-radius: 13px 13px 45% 45%; }
  .math-icon span { font-size: 56px; }
  .math-icon i { width: 34px; left: 13px; bottom: 12px; }
  .tasks-icon { padding-left: 28px; gap: 8px; }
  .tasks-icon i { width: 20px; height: 2px; }
  .tasks-icon i::before { left: -13px; width: 7px; height: 7px; }
  .card-content h3 { font-size: 21px; }
  .card-content p { font-size: 11px; }
  .green-orb { width: 61px; height: 61px; }
  .water-drop { width: 34px; height: 48px; }
  .art-caption { font-size: 8px; letter-spacing: 2px; }
}
@media (max-width: 700px) {
  body::before { height: 1330px; background-position: center top; }
  .page-shell { width: calc(100% - 32px); margin-top: 16px; }
  .site-header { min-height: 68px; border-radius: 18px; padding: 10px 13px; gap: 10px; }
  .wordmark { font-size: 20px; gap: 8px; }
  .brand-mark { width: 37px; height: 37px; font-size: 27px; }
  .site-header nav { gap: 4px; font-size: 11px; }
  .site-header nav a { gap: 4px; padding: 8px 10px; }
  .hero { display: flex; flex-direction: column; align-items: stretch; min-height: 0; padding: 33px 27px 20px; margin-top: 16px; border-radius: 25px; gap: 11px; }
  .eyebrow { font-size: 10px; letter-spacing: 1.5px; }
  h1 { font-size: 87px; line-height: .98; margin-top: 24px; }
  .hero-subtitle { font-size: 21px; letter-spacing: 1.5px; margin-top: 21px; }
  .hero-description { font-size: 13px; margin-top: 11px; }
  .explore-link { margin-top: 22px; font-size: 12px; }
  .aero-art { align-self: center; max-width: 310px; width: 95%; margin: 4px auto 8px; }
  .green-orb { width: 54px; height: 54px; }
  .clear-orb { width: 30px; height: 30px; }
  .art-caption { bottom: -2%; font-size: 8px; letter-spacing: 2px; }
  .space-section { padding-top: 20px; }
  .section-heading { padding: 18px 20px; margin-bottom: 14px; border-radius: 17px; align-items: flex-start; flex-direction: column; gap: 5px; }
  h2 { font-size: 22px; }
  .section-caption { font-size: 11px; padding: 0; }
  .space-grid { grid-template-columns: 1fr; gap: 16px; }
  .space-card { padding: 21px 23px 17px; border-radius: 21px; }
  .card-content { gap: 22px; padding: 23px 0; }
  .card-content h3 { font-size: 22px; }
  .card-content p { font-size: 12px; }
  .card-category { font-size: 9px; letter-spacing: 1px; }
  .card-bottom { font-size: 11px; }
  .site-footer { padding: 25px 5px 24px; min-height: 0; flex-wrap: wrap; gap: 10px; }
  .site-footer p { flex-basis: 100%; order: 3; font-size: 10px; }
  .site-footer a { margin-left: auto; }
  @supports ((backdrop-filter: blur(10px)) or (-webkit-backdrop-filter: blur(10px))) {
    .hero { background: linear-gradient(155deg, #f3fcfff5 0%, #f1fcfff0 43%, #e5f8fbc9 76%, #def4edaa); }
  }
}
@media (max-width: 360px) {
  .page-shell { width: calc(100% - 24px); margin-top: 12px; }
  .site-header { padding: 10px; gap: 4px; }
  .wordmark { font-size: 18px; gap: 6px; }
  .brand-mark { width: 31px; height: 31px; font-size: 23px; }
  .site-header nav { font-size: 10px; gap: 0; }
  .site-header nav a { padding: 8px 7px; }
  .hero { padding: 30px 22px 18px; }
  h1 { font-size: 77px; }
  .hero-description { font-size: 12px; }
  .space-card { padding: 20px 18px 15px; }
  .card-content { gap: 17px; }
  .card-content p { font-size: 11px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
  .space-card:hover, .space-card:hover .card-arrow, .explore-link:hover { transform: none; }
}
@media print {
  body { background: #fff; color: #173f50; }
  body::before, .skip-link, .aero-art, .explore-link, .site-header nav, .site-footer a { display: none; }
  .page-shell { width: 100%; margin: 0; }
  .site-header, .hero, .section-heading, .space-card { background: #fff; border: 1px solid #bccbd0; box-shadow: none; -webkit-backdrop-filter: none; backdrop-filter: none; }
  .site-header { padding: 12px 20px; }
  .hero { display: block; min-height: 0; padding: 28px; }
  h1 { font-size: 60px; letter-spacing: -3px; line-height: 1; }
  h1 br { display: none; }
  .hero-subtitle { margin-top: 12px; }
  .space-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
  .space-card { break-inside: avoid; }
  .card-content { gap: 15px; }
  .card-arrow { display: none; }
}