/* ==========================================================================
   telemeSYNC landing page
   Order: fonts → variables → reset/base → layout → components → utilities → media queries
   ========================================================================== */

/* Fonts (Inter, SIL Open Font License, see assets/fonts/LICENSE.txt) */
@font-face { font-family: 'Inter'; font-weight: 400; font-display: swap; src: url('assets/fonts/Inter-400.woff2') format('woff2'); }
@font-face { font-family: 'Inter'; font-weight: 600; font-display: swap; src: url('assets/fonts/Inter-600.woff2') format('woff2'); }
@font-face { font-family: 'Inter'; font-weight: 700; font-display: swap; src: url('assets/fonts/Inter-700.woff2') format('woff2'); }
@font-face { font-family: 'Inter'; font-weight: 800; font-display: swap; src: url('assets/fonts/Inter-800.woff2') format('woff2'); }

/* Variables */
:root {
  --color-bg: #0b0f14;
  --color-bg-alt: #11171e;
  --color-panel: #161e27;
  --color-border: #263241;
  --color-text: #e8edf2;
  --color-muted: #94a3b2;
  --color-accent: #ff7a1a;
  --color-accent-2: #ffc400;
  --color-coffee: #ffdd00;
  --color-ok: #4cc38a;
  --gradient-accent: linear-gradient(90deg, var(--color-accent-2), #ff3d00);

  --font-base: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2.5rem;
  --spacing-xl: 4.5rem;
  --container: 1180px;
  --header-h: 64px;
}

/* Reset / base */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 12px); }
body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-base);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--color-accent-2); }
h1, h2, h3 { line-height: 1.15; margin: 0 0 var(--spacing-sm); letter-spacing: -0.01em; }
h1 { font-size: clamp(2rem, 6vw, 3.4rem); font-weight: 800; }
h2 { font-size: clamp(1.6rem, 4vw, 2.3rem); font-weight: 800; }
h3 { font-size: 1.15rem; font-weight: 700; }
p { margin: 0 0 var(--spacing-sm); }
:focus-visible { outline: 3px solid var(--color-accent-2); outline-offset: 3px; border-radius: 4px; }

.skip-link { position: absolute; left: -9999px; top: 0; background: var(--color-accent); color: #000; padding: 8px 14px; z-index: 100; }
.skip-link:focus { left: 12px; top: 12px; }

/* Layout */
.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 1rem; }
.container--narrow { max-width: 860px; }
.section { padding: var(--spacing-xl) 0; }
.section--alt { background: var(--color-bg-alt); border-top: 1px solid var(--color-border); border-bottom: 1px solid var(--color-border); }
.section__lead { color: var(--color-muted); font-size: 1.08rem; max-width: 62ch; margin-bottom: var(--spacing-md); }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50; height: var(--header-h);
  background: rgba(11, 15, 20, 0.86); backdrop-filter: blur(10px); border-bottom: 1px solid var(--color-border);
}
.site-header__inner { height: 100%; display: flex; align-items: center; justify-content: space-between; gap: var(--spacing-md); }
.brand { font-weight: 800; font-size: 1.3rem; color: var(--color-text); text-decoration: none; letter-spacing: -0.02em; }
.brand em { font-style: normal; color: var(--color-accent); }
.brand:hover { color: var(--color-text); }

/* Language flags (script.js translates the page) */
.lang-switch { display: flex; align-items: center; gap: 6px; margin-left: auto; }
.lang-switch__flag {
  display: block; width: 26px; height: 18px; padding: 0; border: 0; border-radius: 3px; overflow: hidden; cursor: pointer;
  background: none; opacity: 0.5; box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.18); transition: opacity 0.15s, box-shadow 0.15s;
}
.lang-switch__flag svg { display: block; width: 100%; height: 100%; }
.lang-switch__flag:hover, .lang-switch__flag:focus-visible { opacity: 0.9; }
.lang-switch__flag[aria-pressed='true'] { opacity: 1; box-shadow: 0 0 0 2px var(--color-accent); }
.i18n-loading body { visibility: hidden; }
@media (max-width: 420px) {
  .site-header__inner { gap: 10px; }
  .brand { font-size: 1.1rem; }
  .lang-switch { gap: 4px; }
  .lang-switch__flag { width: 21px; height: 15px; }
  .nav-toggle { padding: 8px 4px 8px 8px; }
}

.nav-toggle { display: inline-flex; flex-direction: column; gap: 5px; background: none; border: 0; padding: 10px; cursor: pointer; }
.nav-toggle span { width: 22px; height: 2px; background: var(--color-text); border-radius: 2px; transition: transform 0.2s, opacity 0.2s; }
.nav-toggle[aria-expanded='true'] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded='true'] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded='true'] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.site-nav {
  position: absolute; top: var(--header-h); left: 0; right: 0;
  display: flex; flex-direction: column; gap: 4px; padding: var(--spacing-sm) 1rem var(--spacing-md);
  background: var(--color-bg); border-bottom: 1px solid var(--color-border);
  transform: translateY(-8px); opacity: 0; pointer-events: none; transition: opacity 0.2s, transform 0.2s;
}
.site-nav.is-open { transform: none; opacity: 1; pointer-events: auto; }
.site-nav a { color: var(--color-text); text-decoration: none; padding: 10px 4px; font-weight: 600; }
.site-nav a:hover { color: var(--color-accent); }
.site-nav .btn { margin-top: var(--spacing-xs); text-align: center; }
.site-nav a.btn--primary, .site-nav a.btn--primary:hover { color: #140a00; }
.site-nav a.btn--coffee, .site-nav a.btn--coffee:hover { color: #1b1300; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 0.7rem 1.2rem; border-radius: 999px; border: 1px solid transparent;
  font-weight: 700; text-decoration: none; cursor: pointer; transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
}
.btn:hover { transform: translateY(-1px); }
.btn--primary { background: var(--gradient-accent); color: #140a00; box-shadow: 0 6px 24px rgba(255, 90, 0, 0.28); }
.btn--primary:hover { color: #140a00; box-shadow: 0 8px 30px rgba(255, 90, 0, 0.4); }
.btn--ghost { border-color: var(--color-border); color: var(--color-text); background: rgba(255, 255, 255, 0.03); }
.btn--ghost:hover { border-color: var(--color-accent); color: var(--color-text); }
.btn--coffee { background: var(--color-coffee); color: #1b1300; }
.btn--coffee:hover { color: #1b1300; box-shadow: 0 8px 30px rgba(255, 221, 0, 0.3); }
.btn--big { padding: 0.95rem 1.6rem; font-size: 1.05rem; }
.btn--small { padding: 0.45rem 1rem; font-size: 0.92rem; }

/* Hero */
.hero { padding: var(--spacing-lg) 0 var(--spacing-xl); background: radial-gradient(900px 500px at 85% 0%, rgba(255, 122, 26, 0.16), transparent 70%); }
.hero__grid { display: grid; gap: var(--spacing-lg); align-items: center; }
.eyebrow { color: var(--color-accent); font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; font-size: 0.82rem; }
.accent { background: var(--gradient-accent); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { color: var(--color-muted); font-size: 1.12rem; max-width: 56ch; }
.hero__actions { display: flex; flex-wrap: wrap; gap: var(--spacing-sm); margin: var(--spacing-md) 0; }
.checks { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; color: var(--color-muted); }
.checks li::before { content: '✔'; color: var(--color-ok); margin-right: 8px; }

.hero__frame { margin: 0; }
.hero__frame img {
  width: 100%; aspect-ratio: 16 / 9; border-radius: var(--radius-md); border: 1px solid var(--color-border);
  background: url('assets/images/cena.svg') center / cover no-repeat, #1d2a35;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.55);
}
.hero__frame figcaption { color: var(--color-muted); font-size: 0.82rem; margin-top: var(--spacing-xs); text-align: center; }

/* Steps */
.steps { list-style: none; padding: 0; margin: var(--spacing-md) 0 0; display: grid; gap: var(--spacing-sm); }
.step { background: var(--color-panel); border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: var(--spacing-md); }
.step__n {
  display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 50%;
  background: var(--gradient-accent); color: #140a00; font-weight: 800; margin-bottom: var(--spacing-sm);
}
.step p { color: var(--color-muted); margin: 0; }

/* Gallery */
.gallery__title { margin-top: var(--spacing-lg); font-size: 1.3rem; }
.gallery { display: grid; gap: var(--spacing-md); grid-template-columns: 1fr; margin-top: var(--spacing-md); }
.shot { margin: 0; display: flex; flex-direction: column; gap: var(--spacing-xs); }
.shot img {
  width: 100%; object-fit: contain; padding: 14px; border-radius: var(--radius-md); border: 1px solid var(--color-border);
  /* Checkerboard: shows the images are transparent */
  background: repeating-conic-gradient(#2b3742 0% 25%, #222c35 0% 50%) 0 0 / 22px 22px;
}
.gallery:not(.gallery--wide) .shot img { aspect-ratio: 16 / 10; }
.shot figcaption { color: var(--color-muted); font-size: 0.9rem; }

/* Video */
.video { position: relative; aspect-ratio: 16 / 9; border-radius: var(--radius-lg); overflow: hidden; border: 1px solid var(--color-border); background: url('assets/images/cena.svg') center / cover no-repeat, #1d2a35; }
.video__poster { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.video iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.video__play {
  position: absolute; inset: 0; width: 100%; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: var(--spacing-sm);
  background: linear-gradient(rgba(0, 0, 0, 0.25), rgba(0, 0, 0, 0.55)); border: 0; color: var(--color-text); font: inherit; cursor: pointer;
}
.video__play:disabled { cursor: default; }
.video__icon { width: 78px; height: 78px; border-radius: 50%; background: var(--gradient-accent); position: relative; box-shadow: 0 10px 40px rgba(255, 90, 0, 0.45); transition: transform 0.15s; }
.video__icon::after { content: ''; position: absolute; left: 31px; top: 24px; border-left: 24px solid #140a00; border-top: 15px solid transparent; border-bottom: 15px solid transparent; }
.video__play:not(:disabled):hover .video__icon { transform: scale(1.06); }
.video__play:disabled .video__icon { opacity: 0.45; }
.video__label { font-weight: 700; }
.video-credit { margin-top: var(--spacing-sm); color: var(--color-muted); font-size: 0.9rem; text-align: center; }
.video-credit strong { color: var(--color-text); }

/* Download */
.download { display: grid; gap: var(--spacing-md); align-items: center; }
.download__steps { color: var(--color-muted); padding-left: 1.2rem; margin: 0; }
.download__actions { display: flex; flex-direction: column; align-items: flex-start; gap: var(--spacing-sm); }

/* Roadmap */
.roadmap { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--spacing-sm); }
.roadmap__item { background: var(--color-panel); border: 1px solid var(--color-border); border-left: 4px solid var(--color-accent); border-radius: var(--radius-md); padding: var(--spacing-md); }
.roadmap__item p { color: var(--color-muted); margin: 0; }
.tag { display: inline-block; font-size: 0.75rem; font-weight: 800; text-transform: uppercase; letter-spacing: 0.06em; padding: 3px 10px; border-radius: 999px; margin-bottom: var(--spacing-xs); }
.tag--progress { background: rgba(255, 122, 26, 0.15); color: var(--color-accent); }

/* Changelog */
.changelog { display: grid; gap: var(--spacing-md); }
.release { background: var(--color-panel); border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: var(--spacing-md); }
.release__head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: var(--spacing-xs); margin-bottom: var(--spacing-xs); }
.release__head h3 { margin: 0; }
.release time { color: var(--color-muted); font-size: 0.9rem; }
.release ul { margin: 0; padding-left: 1.2rem; display: grid; gap: 6px; }
.release li::marker { color: var(--color-accent); }

/* Support & sponsors (highlighted band) */
.backers {
  position: relative;
  background:
    radial-gradient(700px 380px at 15% 10%, rgba(255, 221, 0, 0.14), transparent 70%),
    radial-gradient(700px 380px at 90% 90%, rgba(255, 90, 0, 0.16), transparent 70%),
    var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}
.backers::before {
  content: ''; position: absolute; left: 0; right: 0; top: 0; height: 3px; background: var(--gradient-accent);
}
.backers__intro { text-align: center; max-width: 760px; margin: 0 auto var(--spacing-lg); }
.backers__intro .section__lead { margin-left: auto; margin-right: auto; }
.backers__grid { display: grid; gap: var(--spacing-md); }
.backer-card {
  position: relative; display: flex; flex-direction: column; align-items: flex-start; gap: var(--spacing-sm);
  padding: var(--spacing-lg) var(--spacing-md) var(--spacing-md); border-radius: var(--radius-lg);
  /* Gradient border: padding-box fill + border-box gradient */
  border: 2px solid transparent;
  background: linear-gradient(var(--color-panel), var(--color-panel)) padding-box, var(--card-border) border-box;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
}
.backer-card--coffee { --card-border: linear-gradient(135deg, #ffdd00, rgba(255, 221, 0, 0.15)); }
.backer-card--sponsor { --card-border: linear-gradient(135deg, #ff7a1a, rgba(255, 61, 0, 0.15)); }
.backer-card h3 { font-size: 1.5rem; margin: 0; }
.backer-card p { color: var(--color-muted); margin: 0; }
.backer-card .fine { margin-top: calc(var(--spacing-xs) * -1); }
.backer-card__icon {
  display: grid; place-items: center; width: 58px; height: 58px; border-radius: 16px; font-size: 1.8rem;
  background: rgba(255, 221, 0, 0.12);
}
.backer-card--sponsor .backer-card__icon { background: rgba(255, 122, 26, 0.14); color: var(--color-accent); }
.backer-card .sponsor-stat {
  display: flex; align-items: baseline; flex-wrap: wrap; gap: var(--spacing-xs) var(--spacing-sm); width: 100%;
  padding: var(--spacing-sm) var(--spacing-md); border-radius: var(--radius-md);
  border: 1px solid rgba(255, 122, 26, 0.3); background: rgba(255, 122, 26, 0.08);
}
.sponsor-stat b { font-size: 2rem; font-weight: 800; line-height: 1; color: var(--color-accent); }
.sponsor-stat span { color: var(--color-text); font-weight: 600; }

.supporters { width: 100%; margin-top: var(--spacing-sm); padding-top: var(--spacing-md); border-top: 1px solid var(--color-border); }
.supporters h4 { margin: 0 0 var(--spacing-xs); font-size: 1rem; }
.supporters__list { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--spacing-xs); }
.supporter { display: flex; align-items: center; gap: var(--spacing-sm); padding: var(--spacing-xs) 0; border-bottom: 1px solid var(--color-border); }
.supporter:last-child { border-bottom: 0; }
.supporter__cup { font-size: 1.3rem; }
.supporter__name { font-weight: 700; }
.supporter__meta { color: var(--color-muted); font-size: 0.85rem; }
.supporters__empty { color: var(--color-muted); }

/* Sponsors */
.sponsors__title { margin-top: var(--spacing-lg); text-align: center; color: var(--color-muted); text-transform: uppercase; letter-spacing: 0.1em; font-size: 0.9rem; }
.sponsors { display: grid; gap: var(--spacing-md); grid-template-columns: 1fr; }
.sponsor-slot {
  min-height: 140px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 6px;
  border: 2px dashed var(--color-border); border-radius: var(--radius-md); color: var(--color-muted); text-decoration: none; font-weight: 600;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}
.sponsor-slot:hover { border-color: var(--color-accent); color: var(--color-text); background: rgba(255, 122, 26, 0.05); }
.sponsor-slot__plus { font-size: 2rem; line-height: 1; color: var(--color-accent); }

/* Author */
.author { display: grid; gap: var(--spacing-md); align-items: start; }
.author__avatar {
  width: 96px; height: 96px; border-radius: 50%; display: grid; place-items: center;
  background: var(--gradient-accent); color: #140a00; font-weight: 800; font-size: 2rem;
}
.author__role { color: var(--color-accent); font-weight: 700; }
.author p { color: var(--color-muted); }
.author__actions { display: flex; flex-wrap: wrap; gap: var(--spacing-sm); margin-top: var(--spacing-md); }

/* Footer */
.site-footer { padding: var(--spacing-lg) 0; border-top: 1px solid var(--color-border); color: var(--color-muted); font-size: 0.92rem; }
.site-footer__inner { display: grid; gap: var(--spacing-sm); }
.visits { display: inline-flex; align-items: center; gap: 8px; }
.visits__dot { width: 8px; height: 8px; border-radius: 50%; background: var(--color-ok); box-shadow: 0 0 0 4px rgba(76, 195, 138, 0.18); }
.visits b { color: var(--color-text); }

/* Legal page */
.legal { padding: var(--spacing-lg) 0 var(--spacing-xl); }
.legal h1 { font-size: clamp(1.8rem, 5vw, 2.6rem); }
.legal h2 { font-size: 1.35rem; margin-top: var(--spacing-lg); }
.legal p, .legal li { color: var(--color-muted); }
.legal ul { padding-left: 1.2rem; }
.legal strong { color: var(--color-text); }
.legal__toc { background: var(--color-panel); border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: var(--spacing-md); }
.legal__toc ol { margin: 0; padding-left: 1.2rem; display: grid; gap: 4px; }

/* Utilities */
.muted { color: var(--color-muted); }
.fine { color: var(--color-muted); font-size: 0.8rem; }
[hidden] { display: none !important; }

/* Reveal on scroll (class toggled by script.js) */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

/* Media queries */
@media (min-width: 640px) {
  .container { padding: 0 1.5rem; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .gallery { grid-template-columns: repeat(2, 1fr); }
  .gallery--wide { grid-template-columns: 1fr; }
  .sponsors { grid-template-columns: repeat(3, 1fr); }
  .author { grid-template-columns: auto 1fr; }
}

@media (min-width: 900px) {
  .nav-toggle { display: none; }
  .lang-switch { order: 3; margin-left: 0; }
  .site-nav { margin-left: auto; }
  .site-nav {
    position: static; flex-direction: row; align-items: center; gap: var(--spacing-md); padding: 0;
    background: none; border: 0; transform: none; opacity: 1; pointer-events: auto;
  }
  .site-nav a { padding: 0; }
  .site-nav .btn { margin: 0; padding: 0.45rem 1rem; }
  .hero { padding-top: var(--spacing-xl); }
  .hero__grid { grid-template-columns: 1fr 1.15fr; }
  .steps { grid-template-columns: repeat(4, 1fr); }
  .gallery { grid-template-columns: repeat(3, 1fr); }
  .gallery--wide { grid-template-columns: repeat(2, 1fr); }
  .download { grid-template-columns: 1.4fr 1fr; }
  .download__actions { align-items: stretch; }
  .backers__grid { grid-template-columns: 1fr 1fr; }
  .site-footer__inner { grid-template-columns: 1fr auto; align-items: center; }
  .site-footer__inner .fine { grid-column: 1 / -1; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .btn, .video__icon { transition: none; }
}