/* STV website · premium dark, electric blue and soft violet
   Fonts: Inter and IBM Plex Sans Arabic, both SIL OFL 1.1 (licence files in assets/fonts) */
@font-face { font-family: 'Inter'; src: url('assets/fonts/Inter-VF.ttf') format('truetype'); font-weight: 100 900; font-display: swap;
  unicode-range: U+0000-024F, U+2000-206F, U+20AC, U+2190-21FF, U+2212; }
@font-face { font-family: 'Plex Arabic'; src: url('assets/fonts/IBMPlexSansArabic-Regular.ttf') format('truetype'); font-weight: 300 450; font-display: swap;
  unicode-range: U+0600-06FF, U+0750-077F, U+08A0-08FF, U+FB50-FDFF, U+FE70-FEFF; }
@font-face { font-family: 'Plex Arabic'; src: url('assets/fonts/IBMPlexSansArabic-SemiBold.ttf') format('truetype'); font-weight: 451 800; font-display: swap;
  unicode-range: U+0600-06FF, U+0750-077F, U+08A0-08FF, U+FB50-FDFF, U+FE70-FEFF; }

:root {
  --bg: #04060d;
  --bg-2: #070b17;
  --panel: rgba(14, 20, 40, 0.72);
  --panel-solid: #0b1122;
  --line: rgba(130, 160, 255, 0.14);
  --line-strong: rgba(130, 170, 255, 0.32);
  --text: #eef2ff;
  --text-2: #b6c0de;
  --text-3: #7f8bb0;
  --blue: #4d8dff;
  --blue-2: #2f6bff;
  --cyan: #63d4ff;
  --violet: #9b7bff;
  --glow: 0 0 0 1px rgba(110, 150, 255, 0.25), 0 20px 60px -20px rgba(60, 110, 255, 0.55);
  --radius: 22px;
  --font: 'Inter', 'Plex Arabic', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --wrap: 1180px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; -webkit-text-size-adjust: 100%; }
html[lang='ar'] { --font: 'Plex Arabic', 'Inter', system-ui, 'Segoe UI', sans-serif; }
body {
  margin: 0; background: var(--bg); color: var(--text); font-family: var(--font); font-size: 17px; line-height: 1.6;
  overflow-x: hidden; -webkit-font-smoothing: antialiased;
  background-image:
    radial-gradient(900px 520px at 12% -6%, rgba(47, 107, 255, 0.22), transparent 60%),
    radial-gradient(800px 600px at 95% 18%, rgba(155, 123, 255, 0.16), transparent 60%),
    radial-gradient(1000px 700px at 50% 120%, rgba(47, 107, 255, 0.12), transparent 60%);
  background-repeat: no-repeat;
}
html[lang='ar'] body { line-height: 1.8; }
img, video { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
svg { width: 20px; height: 20px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
svg .fill, svg path.fill { fill: currentColor; stroke: none; }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 10px; }
.skip { position: absolute; inset-inline-start: 16px; top: -60px; z-index: 50; background: var(--blue); color: #fff; padding: 10px 16px; border-radius: 10px; }
.skip:focus { top: 12px; }

/* nav */
.nav {
  position: sticky; top: 0; z-index: 20; display: flex; align-items: center; gap: 24px;
  max-width: calc(var(--wrap) + 48px); margin: 0 auto; padding: 14px 24px;
  background: linear-gradient(to bottom, rgba(4, 6, 13, 0.92), rgba(4, 6, 13, 0.7)); backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
}
.nav.scrolled { border-bottom-color: var(--line); }
.brand img { height: 40px; width: auto; }
.links { display: flex; gap: 6px; margin-inline-start: auto; }
.links a { color: var(--text-2); font-size: 15px; padding: 8px 12px; border-radius: 10px; transition: color .2s, background .2s; }
.links a:hover { color: var(--text); background: rgba(255, 255, 255, 0.05); }
.nav-actions { display: flex; align-items: center; gap: 10px; }
.lang {
  display: inline-flex; align-items: center; gap: 8px; height: 40px; padding: 0 14px; border-radius: 999px; cursor: pointer;
  background: rgba(255, 255, 255, 0.04); border: 1px solid var(--line-strong); color: var(--text); font: inherit; font-size: 14px;
}
.lang svg { width: 18px; height: 18px; }
.lang:hover { background: rgba(255, 255, 255, 0.08); }

/* buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px; height: 52px; padding: 0 22px; border-radius: 14px;
  font-weight: 600; font-size: 16px; transition: transform .2s, box-shadow .2s, background .2s; white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: linear-gradient(135deg, var(--blue) 0%, var(--violet) 100%); color: #fff; box-shadow: 0 12px 34px -12px rgba(77, 141, 255, 0.8); }
.btn-primary:hover { box-shadow: 0 16px 44px -12px rgba(110, 140, 255, 0.95); }
.btn-ghost { background: rgba(255, 255, 255, 0.04); border: 1px solid var(--line-strong); color: var(--text); }
.btn-ghost:hover { background: rgba(255, 255, 255, 0.08); }
.btn-small { height: 40px; padding: 0 16px; font-size: 14px; border-radius: 12px; }
.btn-large { height: 60px; padding: 0 30px; font-size: 18px; }
.muted { color: var(--text-3); font-weight: 500; }

/* hero */
.hero { max-width: calc(var(--wrap) + 48px); margin: 0 auto; padding: 56px 24px 40px; text-align: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 10px; margin: 0 0 18px; padding: 6px 14px; border-radius: 999px;
  border: 1px solid var(--line); background: rgba(255, 255, 255, 0.03); color: var(--text-2); font-size: 13px; letter-spacing: .04em; }
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 12px var(--cyan); }
h1 { margin: 0; }
.hero-logo { width: min(520px, 78vw); height: auto; margin: 0 auto; filter: drop-shadow(0 10px 40px rgba(60, 120, 255, 0.35)); }
.tagline { margin: 8px 0 0; font-size: clamp(30px, 4.6vw, 52px); font-weight: 700; letter-spacing: -0.02em;
  background: linear-gradient(90deg, #fff 0%, #cfe0ff 45%, #b7a6ff 100%); -webkit-background-clip: text; background-clip: text; color: transparent; }
html[lang='ar'] .tagline { letter-spacing: 0; }
.lead { max-width: 640px; margin: 14px auto 0; color: var(--text-2); font-size: clamp(17px, 1.8vw, 20px); }
.actions { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-top: 28px; }
.meta { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 6px 10px; margin: 22px 0 0; color: var(--text-3); font-size: 14px; }
.sep { opacity: .5; }
.badge { display: inline-block; padding: 2px 10px; border-radius: 999px; font-size: 12px; font-weight: 600; letter-spacing: .03em;
  color: #bff0d6; background: rgba(60, 200, 140, 0.12); border: 1px solid rgba(90, 220, 160, 0.35); }
.tv { position: relative; margin: 0; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line-strong); box-shadow: var(--glow); background: var(--panel-solid); }
.tv img { width: 100%; height: auto; aspect-ratio: 16 / 9; object-fit: cover; }
.hero-shot { max-width: 1040px; margin: 48px auto 0; transform: perspective(1600px) rotateX(4deg); transform-origin: 50% 0; }
.hero-shot::after { content: ''; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(to bottom, transparent 70%, rgba(4, 6, 13, 0.35)); }

/* sections */
.section { max-width: calc(var(--wrap) + 48px); margin: 0 auto; padding: 72px 24px; }
.section-head { max-width: 720px; margin-bottom: 34px; }
.label { display: inline-block; font-size: 12px; letter-spacing: .16em; color: var(--cyan); font-weight: 600; margin-bottom: 10px; }
html[lang='ar'] .label { letter-spacing: .04em; }
h2 { margin: 0; font-size: clamp(30px, 4vw, 46px); line-height: 1.12; letter-spacing: -0.02em; font-weight: 700; }
html[lang='ar'] h2 { letter-spacing: 0; line-height: 1.35; }
.section-head p { margin: 14px 0 0; color: var(--text-2); }

.tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.tabs button, .custom-list button { font: inherit; cursor: pointer; color: var(--text-2); background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--line); border-radius: 12px; transition: background .2s, color .2s, border-color .2s; }
.tabs button { padding: 9px 16px; font-size: 15px; }
.tabs button[aria-selected='true'], .custom-list button[aria-selected='true'] { color: #fff; border-color: var(--line-strong);
  background: linear-gradient(135deg, rgba(77, 141, 255, 0.22), rgba(155, 123, 255, 0.18)); }
.tabs button:hover, .custom-list button:hover { color: var(--text); }
.showcase-frame img, .custom-frame img { transition: opacity .25s; }
.swap { opacity: 0; }

.grid { display: grid; gap: 16px; }
.features { grid-template-columns: repeat(3, 1fr); }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; backdrop-filter: blur(6px);
  transition: border-color .25s, transform .25s; }
.card:hover { border-color: var(--line-strong); transform: translateY(-2px); }
.card h3 { margin: 14px 0 6px; font-size: 19px; }
.card p { margin: 0; color: var(--text-2); font-size: 15.5px; }
.ico { display: inline-grid; place-items: center; width: 44px; height: 44px; border-radius: 13px; color: #cfe0ff;
  background: linear-gradient(135deg, rgba(77, 141, 255, 0.25), rgba(155, 123, 255, 0.2)); border: 1px solid var(--line-strong); }
.ico svg { width: 22px; height: 22px; }

.custom { display: grid; grid-template-columns: 320px 1fr; gap: 20px; align-items: start; }
.custom-list { display: grid; gap: 10px; }
.custom-list button { display: grid; gap: 2px; text-align: start; padding: 14px 16px; }
.custom-list b { color: var(--text); font-size: 16px; }
.custom-list span { font-size: 14px; color: var(--text-3); }

.video { margin: 0; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line-strong); box-shadow: var(--glow); background: #000; }
.video video { width: 100%; height: auto; aspect-ratio: 16 / 9; }

.download-card { display: grid; grid-template-columns: 1.4fr 1fr; gap: 32px; align-items: center; padding: 36px; border-radius: 28px;
  background: linear-gradient(135deg, rgba(47, 107, 255, 0.16), rgba(155, 123, 255, 0.12)), var(--panel-solid); border: 1px solid var(--line-strong); box-shadow: var(--glow); }
.facts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px 20px; margin: 24px 0 0; }
.facts div { min-width: 0; }
.facts dt { font-size: 13px; color: var(--text-3); }
.facts dd { margin: 2px 0 0; font-weight: 600; }
.sha { margin: 22px 0 0; display: grid; gap: 4px; font-size: 13px; color: var(--text-3); }
.sha code { font-family: ui-monospace, Consolas, monospace; font-size: 12.5px; color: var(--text-2); overflow-wrap: anywhere; direction: ltr; text-align: start; }
.dl-actions { display: grid; justify-items: center; gap: 14px; text-align: center; }
.text-link { color: #cfe0ff; border-bottom: 1px solid var(--line-strong); padding-bottom: 2px; }
.note { margin: 0; color: var(--text-3); font-size: 14px; max-width: 320px; }

.steps { grid-template-columns: repeat(4, 1fr); }
.num { display: inline-grid; place-items: center; width: 36px; height: 36px; border-radius: 50%; font-weight: 700; color: #fff;
  background: linear-gradient(135deg, var(--blue), var(--violet)); }
.adb { margin-top: 20px; padding: 18px 22px; border-radius: 18px; border: 1px dashed var(--line-strong); background: rgba(255, 255, 255, 0.02); }
.adb p { margin: 0 0 10px; color: var(--text-2); }
.adb pre { margin: 0; overflow-x: auto; padding: 12px 14px; border-radius: 12px; background: #060a16; border: 1px solid var(--line); text-align: left; }
.adb code { font-family: ui-monospace, Consolas, monospace; font-size: 14px; color: #cfe0ff; }

.faq { display: grid; gap: 10px; max-width: 860px; }
.faq details { background: var(--panel); border: 1px solid var(--line); border-radius: 16px; padding: 0 20px; }
.faq details[open] { border-color: var(--line-strong); }
.faq summary { cursor: pointer; list-style: none; padding: 18px 0; font-weight: 600; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; color: var(--cyan); font-size: 22px; line-height: 1; transition: transform .2s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq p { margin: 0 0 18px; color: var(--text-2); }

.support-card { text-align: center; padding: 48px 24px; border-radius: 28px; border: 1px solid var(--line);
  background: radial-gradient(600px 240px at 50% 0%, rgba(155, 123, 255, 0.18), transparent 70%), var(--panel-solid); }
.support-card p { color: var(--text-2); max-width: 560px; margin: 12px auto 0; }

.footer { max-width: calc(var(--wrap) + 48px); margin: 0 auto; padding: 40px 24px 48px; border-top: 1px solid var(--line);
  display: grid; grid-template-columns: 1fr auto; gap: 20px 32px; align-items: center; }
.foot-brand img { height: 30px; width: auto; }
.foot-brand p { margin: 8px 0 0; color: var(--text-3); font-size: 14px; }
.foot-links { display: flex; flex-wrap: wrap; gap: 6px 18px; }
.foot-links a { color: var(--text-2); font-size: 15px; }
.foot-links a:hover { color: #fff; }
.copy { grid-column: 1 / -1; display: flex; flex-wrap: wrap; gap: 6px 10px; margin: 0; color: var(--text-3); font-size: 13px; }

/* reveal on scroll (only when motion is allowed and JS is running) */
.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s ease, transform .7s ease; }
.js .reveal.in { opacity: 1; transform: none; }

@media (max-width: 1020px) {
  .links { display: none; }
  .nav-actions { margin-inline-start: auto; }
  .features { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .custom { grid-template-columns: 1fr; }
  .custom-list { grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); }
  .download-card { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  body { font-size: 16px; }
  .nav { padding: 10px 16px; gap: 10px; }
  .brand img { height: 32px; }
  .lang { height: 36px; padding: 0 10px; }
  .hero { padding: 36px 16px 24px; }
  .hero-shot { margin-top: 32px; transform: none; }
  .actions .btn { width: 100%; }
  .section { padding: 52px 16px; }
  .features, .steps { grid-template-columns: 1fr; }
  .custom-list { grid-template-columns: 1fr 1fr; }
  .custom-list span { display: none; }
  .download-card { padding: 24px 18px; }
  .facts { grid-template-columns: repeat(2, 1fr); }
  .footer { grid-template-columns: 1fr; padding: 32px 16px 40px; }
  .btn-large { width: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
  .js .reveal { opacity: 1; transform: none; }
  .hero-shot { transform: none; }
}