/* ============================================================
   iOPCPlayer — landing page
   Self-contained, no external requests. System font stack.
   ============================================================ */

:root {
  --navy-900: #061331;
  --navy-800: #0a1b3d;
  --navy-700: #0f2350;
  --navy-600: #16306b;
  --blue-500: #2f6bff;
  --blue-400: #4d8bff;
  --cyan-400: #5bc8ff;
  --cyan-300: #8fe0ff;

  --ink: #eef3fb;
  --ink-soft: #aebbd2;
  --ink-mute: #7f8eab;

  --glass: rgba(255, 255, 255, 0.055);
  --glass-strong: rgba(255, 255, 255, 0.09);
  --hair: rgba(255, 255, 255, 0.10);
  --hair-soft: rgba(255, 255, 255, 0.06);

  --radius: 18px;
  --radius-sm: 12px;
  --maxw: 1120px;
  --shadow: 0 24px 60px -24px rgba(0, 0, 0, 0.65);
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
    "Helvetica Neue", Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--navy-900);
  background-image:
    radial-gradient(1200px 700px at 75% -10%, rgba(47, 107, 255, 0.20), transparent 60%),
    radial-gradient(900px 600px at 10% 5%, rgba(91, 200, 255, 0.12), transparent 55%),
    linear-gradient(180deg, var(--navy-800), var(--navy-900) 60%);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  line-height: 1.6;
}

a { color: var(--cyan-300); text-decoration: none; }
a:hover { color: #fff; }

code, kbd, pre { font-family: var(--mono); }
code {
  font-size: 0.86em;
  background: rgba(91, 200, 255, 0.12);
  border: 1px solid rgba(91, 200, 255, 0.18);
  padding: 0.08em 0.4em;
  border-radius: 6px;
  color: var(--cyan-300);
}
kbd {
  font-size: 0.8em;
  background: var(--glass-strong);
  border: 1px solid var(--hair);
  border-bottom-width: 2px;
  border-radius: 6px;
  padding: 0.1em 0.45em;
  color: var(--ink);
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--blue-500);
  color: #fff;
  padding: 10px 16px;
  border-radius: 0 0 10px 0;
  z-index: 200;
}
.skip-link:focus { left: 0; }

.ic { width: 18px; height: 18px; display: block; }
.ic--lg { width: 26px; height: 26px; }

/* ============ NAV ============ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: saturate(160%) blur(18px);
  -webkit-backdrop-filter: saturate(160%) blur(18px);
  background: rgba(8, 18, 42, 0.55);
  border-bottom: 1px solid var(--hair-soft);
}
.nav__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  gap: 24px;
}
.nav__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-weight: 650;
  letter-spacing: -0.01em;
  font-size: 17px;
}
.nav__logo { border-radius: 8px; }
.nav__links {
  display: flex;
  gap: 26px;
  margin-left: 8px;
  font-size: 14.5px;
}
.nav__links a { color: var(--ink-soft); }
.nav__links a:hover { color: #fff; }
.nav__actions { margin-left: auto; }

/* ============ BUTTONS ============ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-weight: 600;
  font-size: 15px;
  padding: 11px 20px;
  border-radius: 12px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.16s ease, background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn--primary {
  background: linear-gradient(180deg, var(--blue-400), var(--blue-500));
  color: #fff;
  box-shadow: 0 10px 28px -10px rgba(47, 107, 255, 0.8);
}
.btn--primary:hover { color: #fff; box-shadow: 0 14px 34px -10px rgba(47, 107, 255, 0.95); }
.btn--ghost {
  background: var(--glass);
  border-color: var(--hair);
  color: var(--ink);
}
.btn--ghost:hover { background: var(--glass-strong); color: #fff; }
.btn--appstore {
  background: #000;
  border-color: rgba(255, 255, 255, 0.16);
  color: #fff;
  padding: 9px 20px;
}
.btn--appstore:hover { color: #fff; border-color: rgba(255,255,255,0.3); }
.btn__stack { display: flex; flex-direction: column; line-height: 1.1; text-align: left; }
.btn__stack small { font-size: 10px; font-weight: 500; color: #c9d2e3; letter-spacing: 0.02em; }
.btn__stack strong { font-size: 16px; font-weight: 600; }

/* ============ HERO ============ */
.hero {
  position: relative;
  overflow: hidden;
  padding: 86px 24px 96px;
  text-align: center;
}
.hero__canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.55;
  pointer-events: none;
}
.hero__glow {
  position: absolute;
  width: 720px;
  height: 720px;
  left: 50%;
  top: -260px;
  transform: translateX(-50%);
  background: radial-gradient(circle, rgba(91, 200, 255, 0.22), transparent 62%);
  filter: blur(20px);
  pointer-events: none;
}
.hero__content {
  position: relative;
  max-width: 820px;
  margin: 0 auto;
}
.hero__icon {
  border-radius: 26px;
  box-shadow: var(--shadow), 0 0 0 1px var(--hair-soft);
  margin-bottom: 26px;
}
.hero__eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 12px;
  font-weight: 600;
  color: var(--cyan-300);
  margin: 0 0 14px;
}
.hero__title {
  font-size: clamp(34px, 6vw, 62px);
  line-height: 1.04;
  letter-spacing: -0.025em;
  font-weight: 700;
  margin: 0 0 20px;
  color: #fff;
}
.hero__sub {
  font-size: clamp(16px, 2.2vw, 20px);
  color: var(--ink-soft);
  max-width: 660px;
  margin: 0 auto 32px;
}
.hero__sub strong { color: var(--ink); font-weight: 650; }
.hero__cta {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}
.hero__note {
  margin: 22px auto 0;
  max-width: 520px;
  font-size: 13.5px;
  color: var(--ink-mute);
}

/* ============ STRIP ============ */
.strip {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* ============ INTENDED-USE NOTICE ============ */
.notice {
  max-width: var(--maxw);
  margin: 40px auto 0;
  padding: 0 24px;
}
.notice__inner {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  padding: 22px 26px;
  border-radius: var(--radius);
  background: rgba(255, 184, 77, 0.07);
  border: 1px solid rgba(255, 184, 77, 0.35);
}
.notice__icon { flex: none; width: 26px; height: 26px; margin-top: 2px; color: #ffb84d; }
.notice h2 { margin: 0 0 6px; font-size: 18px; line-height: 1.3; color: #fff; text-align: left; }
.notice p { margin: 0; color: var(--ink-soft); font-size: 15px; line-height: 1.6; }
.notice strong { color: #fff; }
.strip__list {
  list-style: none;
  margin: 0;
  padding: 22px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  background: var(--glass);
  border: 1px solid var(--hair-soft);
  border-radius: var(--radius);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}
.strip__list li { text-align: center; }
.strip__list strong {
  display: block;
  font-size: 22px;
  color: #fff;
  letter-spacing: -0.01em;
}
.strip__list span { font-size: 13px; color: var(--ink-mute); }

/* ============ SECTIONS ============ */
.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 96px 24px;
}
.section__head { max-width: 720px; margin: 0 auto 52px; text-align: center; }
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 12px;
  font-weight: 650;
  color: var(--cyan-400);
  margin: 0 0 12px;
}
.section h2 {
  font-size: clamp(27px, 4vw, 40px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  font-weight: 700;
  color: #fff;
  margin: 0 0 14px;
}
.lede { font-size: 17px; color: var(--ink-soft); margin: 0; }

/* ============ GRID + CARDS ============ */
.grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.grid--3 { grid-template-columns: repeat(3, 1fr); }

.card {
  background: var(--glass);
  border: 1px solid var(--hair-soft);
  border-radius: var(--radius);
  padding: 24px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}
.card:hover { transform: translateY(-4px); border-color: var(--hair); background: var(--glass-strong); }
.card h3 { margin: 4px 0 8px; font-size: 17px; color: #fff; letter-spacing: -0.01em; }
.card p { margin: 0; font-size: 14.5px; color: var(--ink-soft); }
.card--plain { background: transparent; }
.card--plain:hover { transform: none; background: var(--glass); }

.card__icon {
  width: 42px;
  height: 42px;
  border-radius: 11px;
  background: linear-gradient(160deg, rgba(91, 200, 255, 0.22), rgba(47, 107, 255, 0.16));
  border: 1px solid rgba(91, 200, 255, 0.25);
  margin-bottom: 16px;
  background-repeat: no-repeat;
  background-position: center;
  background-size: 22px 22px;
}

/* inline SVG icons via data-URI masks would need CSS; use background images */
.card__icon[data-i="link"]        { background-image: url("assets/i-link.svg"); }
.card__icon[data-i="tree"]        { background-image: url("assets/i-tree.svg"); }
.card__icon[data-i="pencil"]      { background-image: url("assets/i-pencil.svg"); }
.card__icon[data-i="fx"]          { background-image: url("assets/i-fx.svg"); }
.card__icon[data-i="bell"]        { background-image: url("assets/i-bell.svg"); }
.card__icon[data-i="alarm"]       { background-image: url("assets/i-alarm.svg"); }
.card__icon[data-i="history"]     { background-image: url("assets/i-history.svg"); }
.card__icon[data-i="shield-check"]{ background-image: url("assets/i-shield.svg"); }
.card__icon[data-i="bug"]         { background-image: url("assets/i-bug.svg"); }
.card__icon[data-i="spark"]       { background-image: url("assets/i-spark.svg"); }
.card__icon[data-i="chat"]        { background-image: url("assets/i-chat.svg"); }
.card__icon[data-i="warn"]        { background-image: url("assets/i-warn.svg"); }
.card__icon[data-i="db"]          { background-image: url("assets/i-db.svg"); }
.card__icon[data-i="search"]      { background-image: url("assets/i-search.svg"); }
.card__icon[data-i="gauge"]       { background-image: url("assets/i-gauge.svg"); }
.card__icon[data-i="server"]      { background-image: url("assets/i-server.svg"); }
.card__icon[data-i="node-add"]    { background-image: url("assets/i-node-add.svg"); }
.card__icon[data-i="lock"]        { background-image: url("assets/i-lock.svg"); }
.card__icon[data-i="globe"]       { background-image: url("assets/i-globe.svg"); }

/* ============ SCREENSHOTS ============ */
.shots {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 44px 32px;
}
.shot { margin: 0; }
.shot a { display: block; }
.shot img {
  display: block;
  width: 100%;
  height: auto;
  filter: drop-shadow(0 26px 55px rgba(0, 0, 0, 0.55));
  transition: transform 0.25s ease;
}
.shot a:hover img { transform: translateY(-5px); }
.shot figcaption {
  margin-top: 18px;
  color: var(--ink-soft);
  font-size: 14.5px;
  line-height: 1.5;
}
.shot figcaption strong { color: #fff; font-weight: 650; }
@media (max-width: 760px) { .shots { grid-template-columns: 1fr; gap: 34px; } }

/* ============ FEATURE (NodeSet) ============ */
.section--feature { padding-top: 40px; }
.feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.feature__text h2 { text-align: left; }
.feature__text .eyebrow { text-align: left; }
.ticks { list-style: none; padding: 0; margin: 22px 0 0; }
.ticks--center { max-width: 760px; margin: 0 auto; }
.ticks li {
  position: relative;
  padding-left: 30px;
  margin-bottom: 14px;
  color: var(--ink-soft);
  font-size: 15px;
}
.ticks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 3px;
  width: 19px;
  height: 19px;
  border-radius: 50%;
  background: rgba(91, 200, 255, 0.15) url("assets/i-check.svg") center / 12px no-repeat;
  border: 1px solid rgba(91, 200, 255, 0.35);
}

.codeglass {
  background: rgba(4, 12, 30, 0.7);
  border: 1px solid var(--hair);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.codeglass__bar {
  display: flex;
  gap: 7px;
  padding: 13px 16px;
  border-bottom: 1px solid var(--hair-soft);
  background: rgba(255, 255, 255, 0.03);
}
.codeglass__bar span { width: 11px; height: 11px; border-radius: 50%; background: #3a4258; }
.codeglass__bar span:nth-child(1) { background: #ff5f57; }
.codeglass__bar span:nth-child(2) { background: #febc2e; }
.codeglass__bar span:nth-child(3) { background: #28c840; }
.codeglass__body {
  margin: 0;
  padding: 20px 22px;
  font-size: 13px;
  line-height: 1.7;
  overflow-x: auto;
  color: var(--ink-soft);
}
.c-tag { color: #7ea2ff; }
.c-attr { color: var(--cyan-300); }
.c-str { color: #9be7a0; }
.c-cmt { color: var(--ink-mute); font-style: italic; }
.c-key { color: #c792ea; }
.c-fn { color: #82d8ff; }

/* ============ OPEN SOURCE STEPS ============ */
.steps {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  counter-reset: step;
}
.step {
  background: var(--glass);
  border: 1px solid var(--hair-soft);
  border-radius: var(--radius);
  padding: 24px;
  position: relative;
}
.step__n {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: linear-gradient(160deg, var(--cyan-400), var(--blue-500));
  color: #fff;
  font-weight: 700;
  margin-bottom: 14px;
}
.step h3 { margin: 0 0 6px; font-size: 16px; color: #fff; }
.step p { margin: 0; font-size: 14px; color: var(--ink-soft); }
.os__cta { display: flex; gap: 14px; justify-content: center; margin-top: 40px; flex-wrap: wrap; }

/* ============ SUPPORT ============ */
.section--support .card--action { display: block; }
.card--action {
  cursor: pointer;
}
.card--action h3 { color: #fff; }
.card__cue {
  display: inline-block;
  margin-top: 14px;
  font-size: 14px;
  font-weight: 600;
  color: var(--cyan-300);
}
.card--action:hover .card__cue { color: #fff; }

/* ============ FOOTER ============ */
.footer {
  border-top: 1px solid var(--hair-soft);
  margin-top: 40px;
  background: rgba(4, 12, 30, 0.5);
}
.footer__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 44px 24px 26px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}
.footer__brand { display: flex; align-items: center; gap: 14px; }
.footer__brand img { border-radius: 10px; }
.footer__brand strong { display: block; color: #fff; font-size: 16px; }
.footer__brand span { font-size: 13px; color: var(--ink-mute); }
.footer__links { display: flex; gap: 24px; flex-wrap: wrap; font-size: 14.5px; }
.footer__links a { color: var(--ink-soft); }
.footer__links a:hover { color: #fff; }
.footer__legal {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px 40px;
  border-top: 1px solid var(--hair-soft);
  padding-top: 22px;
}
.footer__legal p { margin: 4px 0; font-size: 12.5px; color: var(--ink-mute); }

/* ============ LEGAL / PROSE ============ */
.legal {
  max-width: 760px;
  margin: 0 auto;
  padding: 72px 24px 64px;
}
.legal h1 {
  font-size: clamp(30px, 5vw, 46px);
  letter-spacing: -0.025em;
  font-weight: 700;
  color: #fff;
  margin: 6px 0 8px;
}
.legal__meta { color: var(--ink-mute); font-size: 14px; margin: 0 0 28px; }
.legal__lead {
  font-size: 18px;
  color: var(--ink-soft);
  background: var(--glass);
  border: 1px solid var(--hair-soft);
  border-radius: var(--radius);
  padding: 20px 22px;
  margin: 0 0 36px;
}
.legal__lead strong { color: #fff; }
.legal h2 {
  font-size: 19px;
  color: #fff;
  letter-spacing: -0.01em;
  margin: 34px 0 10px;
}
.legal p { color: var(--ink-soft); margin: 0 0 14px; }
.legal ul { margin: 0 0 16px; padding-left: 22px; }
.legal li { color: var(--ink-soft); margin-bottom: 9px; }
.legal strong { color: var(--ink); }
.legal__sign {
  margin-top: 40px;
  padding-top: 22px;
  border-top: 1px solid var(--hair-soft);
  font-size: 13.5px;
  color: var(--ink-mute);
}
.legal__back { font-weight: 600; }

/* ============ REVEAL ANIMATION ============ */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .btn:hover, .card:hover { transform: none; }
}

/* ============ RESPONSIVE ============ */
@media (max-width: 940px) {
  .grid, .grid--3, .steps { grid-template-columns: repeat(2, 1fr); }
  .strip__list { grid-template-columns: repeat(2, 1fr); }
  .feature { grid-template-columns: 1fr; gap: 32px; }
  .nav__links { display: none; }
}
@media (max-width: 560px) {
  .grid, .grid--3, .steps, .strip__list { grid-template-columns: 1fr; }
  .section { padding: 64px 20px; }
  .hero { padding: 60px 20px 72px; }
  .footer__inner { flex-direction: column; align-items: flex-start; }
}