/* ============================================================
   Comsync — note.comsync.in
   Porcelain surfaces · waveform signature · two-voice colour
   System fonts only. Self-contained, no external requests.
   ============================================================ */

:root{
  /* surfaces */
  --bg:#F1F0EC;
  --surface:#FFFFFF;
  --surface-2:#FAF9F6;
  --surface-3:#F6F5F1;
  /* ink */
  --ink:#17201C;
  --ink-soft:#3D4642;
  --muted:#79817C;
  --line:#E7E5DE;
  --line-2:#DEDCD3;
  /* voice / accent */
  --accent:#0FAE7E;
  --accent-ink:#0A6B4E;
  --accent-wash:rgba(15,174,126,.10);
  --accent-line:rgba(15,174,126,.28);
  --slate:#5A6B78;
  --slate-wash:rgba(90,107,120,.10);
  --rec:#ED6A5E;
  /* elevation */
  --shadow-sm:0 1px 2px rgba(20,30,25,.05), 0 6px 16px -10px rgba(20,30,25,.14);
  --shadow:0 1px 2px rgba(20,30,25,.05), 0 20px 48px -24px rgba(20,30,25,.24);
  --shadow-lg:0 2px 4px rgba(20,30,25,.05), 0 44px 88px -40px rgba(20,30,25,.34);
  /* geometry */
  --r:16px; --r-sm:11px; --r-lg:22px;
  --maxw:1120px;
  --pad:clamp(20px,5vw,40px);
  /* type */
  --sans:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text","Segoe UI",system-ui,sans-serif;
  --mono:ui-monospace,"SF Mono","JetBrains Mono",Menlo,"Cascadia Code",monospace;
}

@media (prefers-color-scheme:dark){
  :root{
    --bg:#0F1310;
    --surface:#171C18;
    --surface-2:#141914;
    --surface-3:#1B211C;
    --ink:#ECEEE8;
    --ink-soft:#C3C8C0;
    --muted:#8C948B;
    --line:#262D26;
    --line-2:#2E362E;
    --accent:#19C793;
    --accent-ink:#8FE7CB;
    --accent-wash:rgba(25,199,147,.12);
    --accent-line:rgba(25,199,147,.34);
    --slate:#93A6B3;
    --slate-wash:rgba(147,166,179,.12);
    --shadow-sm:0 1px 2px rgba(0,0,0,.4), 0 8px 20px -12px rgba(0,0,0,.6);
    --shadow:0 1px 2px rgba(0,0,0,.5), 0 26px 54px -26px rgba(0,0,0,.7);
    --shadow-lg:0 2px 4px rgba(0,0,0,.5), 0 50px 96px -44px rgba(0,0,0,.8);
  }
  .brand-icon,.side-brand img,.win-side img{
    box-shadow:0 0 0 1px var(--line);border-radius:7px;
  }
}

/* ---------- reset ---------- */
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{
  background:var(--bg);color:var(--ink);
  font-family:var(--sans);line-height:1.55;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:none;cursor:pointer}
::selection{background:var(--accent-wash);color:var(--accent-ink)}

:focus-visible{outline:2.5px solid var(--accent);outline-offset:3px;border-radius:4px}

.wrap{max-width:var(--maxw);margin-inline:auto;padding-inline:var(--pad)}

.skip{
  position:absolute;left:-9999px;top:12px;z-index:100;
  background:var(--ink);color:var(--bg);padding:10px 16px;border-radius:10px;font-size:14px;font-weight:600;
}
.skip:focus{left:16px}

.eyebrow{
  font-family:var(--mono);font-size:12px;font-weight:500;
  letter-spacing:.13em;text-transform:uppercase;color:var(--muted);
}
.mono{font-family:var(--mono)}

/* ============================================================
   Buttons
   ============================================================ */
.btn{
  display:inline-flex;align-items:center;gap:9px;
  font-family:var(--sans);font-weight:600;line-height:1;
  border-radius:11px;border:1px solid transparent;
  transition:transform .16s ease, box-shadow .16s ease, background .16s ease, border-color .16s ease;
  white-space:nowrap;
}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 1px 2px rgba(10,107,78,.3), 0 12px 26px -12px rgba(15,174,126,.6)}
.btn-primary:hover{transform:translateY(-1.5px);box-shadow:0 2px 4px rgba(10,107,78,.3), 0 18px 34px -14px rgba(15,174,126,.7)}
.btn-primary:active{transform:translateY(0)}
.btn-danger{background:var(--surface);border-color:rgba(237,106,94,.4);color:#C6483C;font-weight:600}
.btn-sm{font-size:13.5px;padding:9px 15px}
.btn-lg{font-size:16px;padding:15px 24px;border-radius:13px}
.btn-apple{width:19px;height:19px;margin-top:-2px}

/* ============================================================
   Nav
   ============================================================ */
.nav{
  position:sticky;top:0;z-index:50;
  background:color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter:saturate(1.6) blur(14px);
  -webkit-backdrop-filter:saturate(1.6) blur(14px);
  border-bottom:1px solid transparent;
  transition:border-color .2s ease, background .2s ease;
}
.nav.scrolled{border-bottom-color:var(--line);background:color-mix(in srgb, var(--bg) 92%, transparent)}
.nav-in{
  max-width:var(--maxw);margin-inline:auto;padding:13px var(--pad);
  display:flex;align-items:center;gap:20px;
}
.brand{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.brand-icon{border-radius:7px}
.brand-name{font-size:17px;font-weight:600;letter-spacing:-.02em}
.nav-links{display:flex;gap:26px;margin-inline:auto;font-size:14.5px;color:var(--ink-soft)}
.nav-links a{position:relative;font-weight:500;transition:color .15s}
.nav-links a:hover{color:var(--ink)}
.nav-links a::after{content:"";position:absolute;left:0;right:100%;bottom:-4px;height:1.5px;background:var(--accent);transition:right .2s ease}
.nav-links a:hover::after{right:0}
.nav-cta{display:flex;align-items:center;gap:14px;flex:0 0 auto}
.nav-plat{font-family:var(--mono);font-size:12px;color:var(--muted);letter-spacing:.04em}

/* ============================================================
   Hero
   ============================================================ */
.hero{padding-top:clamp(52px,9vw,104px);padding-bottom:clamp(20px,5vw,44px);position:relative}
.hero-in{display:flex;flex-direction:column;align-items:center;text-align:center}
.hero .eyebrow{margin-bottom:22px}
.hero-title{
  font-size:clamp(2.5rem,7.2vw,5rem);
  font-weight:600;letter-spacing:-.038em;line-height:1.02;
  max-width:16ch;
}
.ink-accent{
  color:var(--accent-ink);
  background:linear-gradient(transparent 62%, var(--accent-wash) 62%);
  padding:0 .08em;
}
.hero-sub{
  margin-top:26px;max-width:58ch;
  font-size:clamp(1.06rem,1.7vw,1.28rem);
  color:var(--ink-soft);line-height:1.55;
}
.hero-sub, .band-sub{text-wrap:balance}
.hero-actions{margin-top:32px;display:flex;flex-direction:column;align-items:center;gap:12px}
.hero-actions.center{margin-top:34px}
.hero-note{font-family:var(--mono);font-size:12.5px;color:var(--muted);letter-spacing:.02em}

/* ---- signature waveform ---- */
.signature{
  width:100%;max-width:940px;margin-top:clamp(46px,6vw,76px);
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  box-shadow:var(--shadow);padding:22px clamp(18px,3vw,30px) 26px;
}
.sig-legend{
  display:flex;align-items:center;gap:18px;margin-bottom:16px;
  font-size:12px;font-weight:600;
}
.lg{display:inline-flex;align-items:center;gap:7px;letter-spacing:.01em}
.lg-dot{width:8px;height:8px;border-radius:50%}
.lg-you{color:var(--accent-ink)}.lg-you .lg-dot{background:var(--accent)}
.lg-them{color:var(--slate)}.lg-them .lg-dot{background:var(--slate)}
.lg-time{margin-left:auto;font-family:var(--mono);font-weight:500;color:var(--muted);letter-spacing:.06em;text-transform:uppercase;font-size:11px}

.wave-band{
  display:flex;align-items:center;gap:3px;
  height:clamp(64px,11vw,104px);width:100%;overflow:hidden;
  --mid:50%;
}
.wave-band .bar{
  flex:1 1 0;min-width:2px;border-radius:3px;
  height:22%;transform-origin:center;
  background:var(--slate);opacity:.85;
  animation:eq 1.25s ease-in-out infinite;
}
.wave-band .bar.you{background:var(--accent)}
@keyframes eq{0%,100%{transform:scaleY(.28)}50%{transform:scaleY(1)}}

/* mini wave in app window */
.mini-wave{display:inline-flex;align-items:center;gap:2px;height:22px;width:78px}
.mini-wave .bar{width:3px;border-radius:2px;height:30%;background:var(--accent);animation:eq 1.1s ease-in-out infinite}
.mini-wave .bar.you{background:var(--accent)}
.mini-wave .bar.them{background:var(--slate)}

/* ============================================================
   Section band heads
   ============================================================ */
.band-head{max-width:66ch}
.band-head .eyebrow{margin-bottom:16px}
.band-title{
  font-size:clamp(1.75rem,3.6vw,2.7rem);
  font-weight:600;letter-spacing:-.03em;line-height:1.08;
}
.band-sub{margin-top:16px;font-size:clamp(1.02rem,1.5vw,1.18rem);color:var(--ink-soft);max-width:60ch}

/* ============================================================
   Showcase — app window
   ============================================================ */
.showcase{padding-block:clamp(56px,9vw,112px)}
.showcase .band-head{margin-bottom:clamp(30px,4vw,48px)}

.win{
  background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--shadow-lg);
}
.win-bar{
  height:42px;display:flex;align-items:center;gap:8px;padding:0 16px;
  background:var(--surface-2);border-bottom:1px solid var(--line);position:relative;
}
.tl{width:11px;height:11px;border-radius:50%}
.tl.r{background:#ED6A5E}.tl.y{background:#F4BF4F}.tl.g{background:#61C554}
.win-title{
  position:absolute;left:50%;transform:translateX(-50%);
  font-size:12.5px;font-weight:500;color:var(--muted);letter-spacing:.01em;
}
.win-body{display:grid;grid-template-columns:210px 1fr;min-height:452px}

.win-side{
  background:var(--surface-2);border-right:1px solid var(--line);
  display:flex;flex-direction:column;padding:16px 13px;gap:4px;
}
.side-brand{display:flex;align-items:center;gap:9px;padding:4px 6px 16px}
.side-brand img{border-radius:6px}
.side-brand b{font-size:15px;font-weight:600;letter-spacing:-.01em}
.side-nav{display:flex;flex-direction:column;gap:2px}
.sn{display:flex;align-items:center;gap:11px;padding:9px 10px;border-radius:9px;font-size:13.5px;font-weight:500;color:var(--ink-soft)}
.sn svg{width:17px;height:17px;opacity:.65}
.sn.on{background:var(--surface);color:var(--ink);box-shadow:var(--shadow-sm)}
.sn.on svg{opacity:1;color:var(--accent)}
.side-foot{margin-top:auto;display:flex;align-items:center;gap:8px;padding:12px 8px 2px;border-top:1px solid var(--line);font-family:var(--mono);font-size:11.5px;color:var(--muted)}
.side-foot .pip{width:7px;height:7px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 3px var(--accent-wash)}

.win-main{display:flex;flex-direction:column;min-width:0}
.win-top{height:54px;display:flex;align-items:center;gap:13px;padding:0 20px;border-bottom:1px solid var(--line)}
.rec{width:9px;height:9px;border-radius:50%;background:var(--rec);box-shadow:0 0 0 4px rgba(237,106,94,.16);animation:recpulse 1.7s ease-in-out infinite;flex:0 0 auto}
@keyframes recpulse{0%,100%{opacity:1}50%{opacity:.4}}
.win-clock{font-family:var(--mono);font-size:13.5px;color:var(--ink);font-variant-numeric:tabular-nums}
.grow{flex:1}

.panes{flex:1;display:grid;grid-template-columns:1fr 1fr;min-height:0}
.pane{padding:22px 24px;min-width:0}
.pane-notes{border-right:1px solid var(--line)}
.pane-tx{background:var(--surface-2)}
.pane-h{font-family:var(--mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:16px}
.pn-lead{font-size:15px;font-weight:600;margin-bottom:11px}
.pn-list{list-style:none;display:flex;flex-direction:column;gap:8px;margin-bottom:16px}
.pn-list li{font-size:14px;color:var(--ink-soft);padding-left:16px;position:relative;line-height:1.5}
.pn-list li::before{content:"–";position:absolute;left:0;color:var(--muted)}
.pn-ghost{font-size:13.5px;color:var(--muted);font-style:italic}

.seg{display:grid;grid-template-columns:44px 1fr;gap:11px;margin-bottom:16px}
.seg .ts{font-family:var(--mono);font-size:11.5px;color:var(--muted);padding-top:2px}
.who{display:inline-block;font-size:10.5px;font-weight:700;text-transform:uppercase;letter-spacing:.05em;margin-bottom:4px}
.seg.you .who{color:var(--accent-ink)}
.seg.them .who{color:var(--slate)}
.tx{font-size:13.5px;line-height:1.55;color:var(--ink)}
.seg.interim .tx{color:var(--muted);font-style:italic}

.win-cap{
  margin-top:22px;max-width:64ch;font-size:14.5px;color:var(--muted);line-height:1.55;
}
.win-cap .mono{color:var(--accent-ink);font-weight:600;font-size:12px;letter-spacing:.06em}

/* ============================================================
   Features — tabs
   ============================================================ */
.features{padding-block:clamp(56px,9vw,112px);border-top:1px solid var(--line)}
.features .band-head{margin-bottom:clamp(28px,4vw,44px)}

.tablist{
  display:inline-flex;gap:6px;padding:5px;
  background:var(--surface-3);border:1px solid var(--line);border-radius:14px;
  margin-bottom:36px;max-width:100%;
}
.tab{
  display:inline-flex;align-items:baseline;gap:9px;
  padding:11px 20px;border-radius:10px;
  font-size:15px;font-weight:600;color:var(--muted);letter-spacing:-.01em;
  transition:color .15s ease, background .15s ease, box-shadow .15s ease;
}
.tab .tab-n{font-family:var(--mono);font-size:11px;font-weight:500;opacity:.7}
.tab:hover{color:var(--ink-soft)}
.tab[aria-selected="true"]{
  background:var(--surface);color:var(--ink);box-shadow:var(--shadow-sm);
}
.tab[aria-selected="true"] .tab-n{color:var(--accent);opacity:1}

.panel{animation:fade .3s ease}
.panel[hidden]{display:none}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.panel-intro{
  font-size:clamp(1.1rem,1.8vw,1.35rem);color:var(--ink);font-weight:500;
  letter-spacing:-.01em;max-width:52ch;margin-bottom:30px;line-height:1.4;
}

.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r);
  padding:26px 24px 28px;box-shadow:var(--shadow-sm);
  transition:transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}
.card:hover{transform:translateY(-3px);border-color:var(--accent-line);box-shadow:var(--shadow)}
.card-ic{
  display:inline-grid;place-items:center;width:42px;height:42px;
  border-radius:12px;background:var(--accent-wash);color:var(--accent-ink);
  margin-bottom:18px;
}
.card-ic svg{width:22px;height:22px}
.card h3{font-size:1.12rem;font-weight:600;letter-spacing:-.01em;margin-bottom:9px}
.card p{font-size:14.5px;color:var(--ink-soft);line-height:1.58}

/* ============================================================
   Private by default
   ============================================================ */
.private{
  padding-block:clamp(56px,9vw,112px);
  background:var(--surface-2);border-top:1px solid var(--line);
}
.private-in{
  display:grid;grid-template-columns:1.15fr .85fr;gap:clamp(32px,5vw,64px);align-items:center;
}
.private-list{list-style:none;display:flex;flex-direction:column;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;box-shadow:var(--shadow-sm)}
.private-list li{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:16px 20px;border-bottom:1px solid var(--line);
}
.private-list li:last-child{border-bottom:none}
.pl-k{font-family:var(--mono);font-size:11.5px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.pl-v{font-size:14.5px;font-weight:500;color:var(--ink);text-align:right}

/* ============================================================
   Closer
   ============================================================ */
.closer{padding-block:clamp(64px,10vw,128px);text-align:center}
.closer-in{display:flex;flex-direction:column;align-items:center}
.closer-mark{color:var(--accent);margin-bottom:26px}
.closer-mark .wm{width:76px;height:38px}
.closer-title{
  font-size:clamp(2rem,4.6vw,3.4rem);font-weight:600;letter-spacing:-.032em;line-height:1.05;max-width:18ch;
}
.closer-sub{margin-top:20px;max-width:52ch;font-size:clamp(1.05rem,1.6vw,1.22rem);color:var(--ink-soft);text-wrap:balance}

/* ============================================================
   Footer
   ============================================================ */
.foot{border-top:1px solid var(--line);background:var(--surface-2);padding-block:40px}
.foot-in{display:flex;flex-wrap:wrap;align-items:center;gap:24px}
.foot-brand{display:flex;align-items:center;gap:11px}
.foot-brand .brand-icon{border-radius:7px}
.foot-brand b{font-size:15px;font-weight:600;display:block;letter-spacing:-.01em}
.foot-dom{font-family:var(--mono);font-size:12px;color:var(--muted)}
.foot-nav{display:flex;gap:22px;margin-inline:auto;font-size:14px;color:var(--ink-soft)}
.foot-nav a{font-weight:500;transition:color .15s}
.foot-nav a:hover{color:var(--accent-ink)}
.foot-fine{font-size:13px;color:var(--muted);flex-basis:100%;text-align:left;padding-top:6px;border-top:1px solid var(--line);margin-top:4px}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width:900px){
  .nav-links{display:none}
  .cards{grid-template-columns:1fr;gap:14px}
  .private-in{grid-template-columns:1fr;gap:30px}
}
@media (max-width:720px){
  .win-body{grid-template-columns:1fr}
  .win-side{display:none}
  .panes{grid-template-columns:1fr}
  .pane-notes{border-right:none;border-bottom:1px solid var(--line)}
  .win-title{display:none}
}
@media (max-width:560px){
  .nav-plat{display:none}
  .tablist{display:flex;width:100%}
  .tab{flex:1;justify-content:center;padding:11px 8px}
  .tab .tab-l{font-size:14px}
  .hero-actions{width:100%}
  .btn-lg{width:100%;justify-content:center}
  .foot-nav{margin-inline:0;flex-basis:100%;flex-wrap:wrap;gap:16px}
}

/* ============================================================
   Reduced motion
   ============================================================ */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;scroll-behavior:auto!important}
  .wave-band .bar,.mini-wave .bar{animation:none}
  .rec{animation:none;opacity:.85}
}

html{scroll-behavior:smooth}