/* ==========================================================================
   RIVULINE Media — shared site shell
   Tokens, animated underwater backdrop, nav, buttons, prose.
   ========================================================================== */

:root{
  --deep:#04121f;
  --deep-2:#061a2b;
  --text:#eef6f8;
  --muted:rgba(238,246,248,.62);
  --faint:rgba(238,246,248,.38);
  --accent:#7fe0d8;
  --accent-dim:#6fd8d2;
  --line:rgba(127,224,216,.16);
  --panel:rgba(8,32,48,.52);
  --nav-h:64px;
  --measure:68ch;
}

*,*::before,*::after{box-sizing:border-box}

html{scroll-behavior:smooth}

body{
  margin:0;
  min-height:100%;
  background:var(--deep);
  color:var(--text);
  font-family:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

/* Home page is a fixed, non-scrolling splash. */
body.home{height:100vh;height:100dvh;overflow:hidden}

a{color:var(--accent);text-decoration-color:rgba(127,224,216,.35);text-underline-offset:3px}
a:hover{text-decoration-color:var(--accent)}

:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:3px;
  border-radius:4px;
}

/* --------------------------------------------------------------------------
   Backdrop: depth gradient + drifting caustics + flowing current lines
   -------------------------------------------------------------------------- */
.backdrop{
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  isolation:isolate;
}
.backdrop::before{
  content:"";
  position:absolute;inset:0;z-index:0;
  background:
    radial-gradient(120% 78% at 50% -12%, #10425a 0%, #0a2a40 34%, #061a2b 62%, #04121f 100%),
    linear-gradient(180deg,#062033 0%,#04121f 70%,#020b14 100%);
}
.backdrop::after{
  content:"";
  position:absolute;inset:0;z-index:3;
  background:radial-gradient(78% 62% at 50% 46%, rgba(0,0,0,0) 42%, rgba(2,9,16,.55) 100%);
}

.caustics{
  position:absolute;inset:-15%;z-index:1;
  filter:blur(46px);
  opacity:.5;
}
.caustics i{
  position:absolute;
  display:block;
  border-radius:50%;
  mix-blend-mode:screen;
}
.c1{
  width:62vw;height:52vw;left:2%;top:-14%;
  background:radial-gradient(circle at 50% 50%, rgba(74,196,196,.42), rgba(74,196,196,0) 68%);
  animation:drift1 26s ease-in-out infinite alternate;
}
.c2{
  width:54vw;height:46vw;right:-6%;top:6%;
  background:radial-gradient(circle at 50% 50%, rgba(56,128,214,.38), rgba(56,128,214,0) 68%);
  animation:drift2 32s ease-in-out infinite alternate;
}
.c3{
  width:70vw;height:40vw;left:14%;bottom:-18%;
  background:radial-gradient(circle at 50% 50%, rgba(30,150,160,.3), rgba(30,150,160,0) 70%);
  animation:drift3 38s ease-in-out infinite alternate;
}
@keyframes drift1{
  from{transform:translate3d(0,0,0) scale(1)}
  to{transform:translate3d(7vw,5vh,0) scale(1.14)}
}
@keyframes drift2{
  from{transform:translate3d(0,0,0) scale(1.08)}
  to{transform:translate3d(-8vw,7vh,0) scale(.94)}
}
@keyframes drift3{
  from{transform:translate3d(0,0,0) scale(1)}
  to{transform:translate3d(-6vw,-5vh,0) scale(1.12)}
}

#waves{
  position:absolute;inset:0;z-index:2;
  width:100%;height:100%;
}

/* Subpages need the copy to stay readable over the moving water. */
body:not(.home) .caustics{opacity:.34}
body:not(.home) #waves{opacity:.6}

/* --------------------------------------------------------------------------
   Nav
   -------------------------------------------------------------------------- */
.nav{
  position:fixed;
  top:0;left:0;right:0;
  z-index:20;
  min-height:var(--nav-h);
  display:flex;
  align-items:center;
  gap:16px;
  flex-wrap:wrap;
  padding:12px clamp(16px,4vw,40px);
  background:linear-gradient(180deg, rgba(4,18,31,.78) 0%, rgba(4,18,31,.34) 62%, rgba(4,18,31,0) 100%);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
}

.nav-brand{
  font-size:14px;
  font-weight:600;
  letter-spacing:.24em;
  text-indent:.24em;
  color:var(--text);
  text-decoration:none;
  white-space:nowrap;
  opacity:.92;
  transition:opacity .2s ease;
}
.nav-brand:hover{opacity:1}
.nav-brand .m{font-weight:300;color:var(--muted)}

.nav-tabs{
  display:flex;
  align-items:center;
  gap:4px;
  margin-left:auto;
  flex-wrap:wrap;
}
.nav-tabs a{
  position:relative;
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:8px 14px;
  border-radius:999px;
  font-size:14px;
  font-weight:400;
  letter-spacing:.04em;
  color:var(--muted);
  text-decoration:none;
  white-space:nowrap;
  transition:color .2s ease, background-color .2s ease;
}
.nav-tabs a:hover{color:var(--text);background:rgba(127,224,216,.09)}
.nav-tabs a[aria-current="page"]{
  color:var(--text);
  background:rgba(127,224,216,.13);
  box-shadow:inset 0 0 0 1px var(--line);
}
.nav-tabs .ext{
  width:11px;height:11px;
  flex:none;
  opacity:.6;
  transform:translateY(-1px);
}
.nav-tabs a:hover .ext{opacity:.95}

/* --------------------------------------------------------------------------
   Home hero
   -------------------------------------------------------------------------- */
.hero{
  position:relative;
  z-index:4;
  height:100vh;
  height:100dvh;
  display:grid;
  place-items:center;
}
.mark{
  margin:0;
  padding:0 24px;
  text-align:center;
  font-size:clamp(22px,7vw,82px);
  font-weight:600;
  letter-spacing:.2em;
  text-indent:.2em;            /* balance the trailing letter-space */
  line-height:1.25;
  white-space:nowrap;
  color:var(--text);
  text-shadow:0 2px 40px rgba(4,18,31,.7);
  opacity:0;
  transform:translateY(14px);
  animation:rise 1.8s cubic-bezier(.2,.7,.25,1) .25s forwards;
}
.mark .m{
  font-weight:300;
  color:rgba(238,246,248,.72);
}
@keyframes rise{to{opacity:1;transform:none}}

/* --------------------------------------------------------------------------
   Subpage layout
   -------------------------------------------------------------------------- */
.page-wrap{
  position:relative;
  z-index:4;
  min-height:100vh;
  min-height:100dvh;
  display:flex;
  flex-direction:column;
  padding:calc(var(--nav-h) + 28px) clamp(16px,5vw,40px) 0;
}
.page-wrap > main{flex:1 0 auto;width:100%}

.site-foot{
  flex:none;
  width:100%;
  max-width:var(--measure);
  margin:72px auto 0;
  padding:22px 0 40px;
  border-top:1px solid rgba(127,224,216,.12);
  display:flex;
  flex-wrap:wrap;
  gap:8px 20px;
  align-items:center;
  font-size:13px;
  color:var(--faint);
}
.site-foot a{color:var(--muted);text-decoration:none}
.site-foot a:hover{color:var(--accent)}
.site-foot .spacer{margin-left:auto}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:14px 24px;
  border:1px solid var(--line);
  border-radius:12px;
  background:rgba(8,32,48,.5);
  color:var(--text);
  font:inherit;
  font-size:15px;
  font-weight:400;
  line-height:1.2;
  text-decoration:none;
  cursor:pointer;
  transition:transform .18s ease, border-color .2s ease, background-color .2s ease;
}
.btn:hover{
  transform:translateY(-1px);
  border-color:rgba(127,224,216,.34);
  background:rgba(12,44,62,.62);
}
.btn:active{transform:none}

.btn-store{
  padding:12px 24px;
  border-color:rgba(127,224,216,.3);
  background:linear-gradient(180deg, rgba(127,224,216,.16), rgba(127,224,216,.06));
  text-align:left;
}
.btn-store .apple{width:22px;height:26px;flex:none;fill:var(--text);opacity:.92}
.btn-store .lines{display:flex;flex-direction:column;gap:1px}
.btn-store .small{font-size:10px;letter-spacing:.09em;text-transform:uppercase;color:var(--muted)}
.btn-store .big{font-size:17px;font-weight:600;letter-spacing:.01em}

/* --------------------------------------------------------------------------
   Prose (privacy policy)
   -------------------------------------------------------------------------- */
.prose{
  max-width:var(--measure);
  margin:0 auto;
  font-size:16px;
  line-height:1.75;
  color:rgba(238,246,248,.84);
}
.prose h1{
  margin:0 0 10px;
  font-size:clamp(28px,5vw,42px);
  font-weight:600;
  letter-spacing:-.01em;
  line-height:1.15;
  color:var(--text);
}
.prose h2{
  margin:44px 0 12px;
  font-size:19px;
  font-weight:600;
  letter-spacing:.01em;
  color:var(--text);
}
.prose h3{
  margin:28px 0 8px;
  font-size:16px;
  font-weight:600;
  color:var(--text);
}
.prose p{margin:0 0 16px}
.prose ul{margin:0 0 16px;padding-left:22px}
.prose li{margin:0 0 8px}
.prose li::marker{color:rgba(127,224,216,.5)}
.prose strong{color:var(--text);font-weight:600}
.prose hr{
  margin:40px 0;
  border:0;
  border-top:1px solid rgba(127,224,216,.12);
}
.eyebrow{
  margin:0 0 14px;
  font-size:12px;
  font-weight:600;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--accent-dim);
}
.dateline{
  margin:0 0 34px;
  font-size:14px;
  color:var(--faint);
}

.callout{
  margin:0 0 32px;
  padding:20px 22px;
  border:1px solid var(--line);
  border-left:2px solid var(--accent-dim);
  border-radius:12px;
  background:var(--panel);
}
.callout p:last-child{margin-bottom:0}

/* Spots that still need a real value before launch. */
.ph{
  padding:1px 7px;
  border:1px dashed rgba(127,224,216,.45);
  border-radius:5px;
  background:rgba(127,224,216,.08);
  font-size:.92em;
  letter-spacing:.02em;
  color:var(--accent);
  white-space:nowrap;
}

/* --------------------------------------------------------------------------
   Motion preferences
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .caustics i{animation:none}
  .mark{animation:none;opacity:1;transform:none}
  .btn:hover{transform:none}
}

/* Visually hidden, still announced by screen readers. */
.sr-only{
  position:absolute;
  width:1px;height:1px;
  margin:-1px;padding:0;
  overflow:hidden;
  clip:rect(0 0 0 0);
  clip-path:inset(50%);
  white-space:nowrap;
  border:0;
}

/* --------------------------------------------------------------------------
   thoughtbubbl product page
   -------------------------------------------------------------------------- */
.product{
  max-width:620px;
  margin:0 auto;
  padding:clamp(24px,7vh,72px) 0 0;
  text-align:center;
}

.app-icon{
  width:clamp(104px,26vw,132px);
  height:clamp(104px,26vw,132px);
  margin:0 auto 26px;
  display:block;
  border-radius:24%;
  /* The icon is a raster image, so the hairline ring sits outside it — an
     inset shadow would paint behind the bitmap and never show. */
  object-fit:cover;
  box-shadow:
    0 18px 50px rgba(2,9,16,.62),
    0 0 0 1px rgba(127,224,216,.22);
}

.product h1{
  margin:0 0 12px;
  font-size:clamp(30px,7vw,46px);
  font-weight:600;
  letter-spacing:-.015em;
  line-height:1.1;
}
.tagline{
  max-width:42ch;
  margin:0 auto 34px;
  font-size:clamp(15px,2.4vw,17px);
  line-height:1.7;
  color:var(--muted);
}

.actions{
  display:flex;
  flex-wrap:wrap;
  gap:14px;
  justify-content:center;
  align-items:stretch;
}
.actions .btn{flex:0 1 auto}

.note{
  margin:20px 0 0;
  font-size:13px;
  line-height:1.6;
  color:var(--faint);
}

/* --------------------------------------------------------------------------
   Narrow screens: the nav wraps to two rows, so content needs more clearance.
   -------------------------------------------------------------------------- */
@media (max-width:560px){
  :root{--nav-h:96px}
  .nav{gap:10px;justify-content:center;padding-bottom:10px}
  .nav-brand{width:100%;text-align:center;font-size:13px}
  .nav-tabs{margin:0 auto;justify-content:center}
  .nav-tabs a{padding:7px 12px;font-size:13.5px}
  .prose{font-size:15.5px}
  .actions .btn{width:100%;max-width:320px}
  .site-foot{margin-top:56px}
}

/* --------------------------------------------------------------------------
   Tables in prose — scroll horizontally rather than squeezing on phones.
   -------------------------------------------------------------------------- */
.table-wrap{
  margin:0 0 24px;
  overflow-x:auto;
  border:1px solid var(--line);
  border-radius:12px;
  background:var(--panel);
  -webkit-overflow-scrolling:touch;
}
.table-wrap table{
  width:100%;
  min-width:440px;
  border-collapse:collapse;
  font-size:14.5px;
  line-height:1.55;
}
.table-wrap th,
.table-wrap td{
  padding:12px 16px;
  text-align:left;
  vertical-align:top;
  border-bottom:1px solid rgba(127,224,216,.1);
}
.table-wrap thead th{
  font-size:11.5px;
  font-weight:600;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--accent-dim);
  background:rgba(127,224,216,.05);
  white-space:nowrap;
}
.table-wrap tbody tr:last-child td{border-bottom:0}
.table-wrap td:first-child{color:var(--text)}

/* Yes/no answers in the "leaves your device" column. */
.never{color:var(--accent);white-space:nowrap}
.maybe{color:rgba(238,246,248,.72)}

/* --------------------------------------------------------------------------
   Contact card — the support page's primary call to action
   -------------------------------------------------------------------------- */
.contact-card{
  margin:0 0 36px;
  padding:24px 26px;
  border:1px solid rgba(127,224,216,.24);
  border-radius:14px;
  background:linear-gradient(180deg, rgba(127,224,216,.1), rgba(8,32,48,.5));
  text-align:center;
}
.contact-label{
  margin:0 0 8px !important;
  font-size:11.5px;
  font-weight:600;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--accent-dim);
}
.contact-value{
  margin:0 0 8px !important;
  font-size:clamp(18px,4.2vw,24px);
  font-weight:600;
  line-height:1.3;
  word-break:break-word;
}
.contact-value a{
  color:var(--text);
  text-decoration:none;
  border-bottom:1px solid rgba(127,224,216,.4);
  padding-bottom:2px;
  transition:color .2s ease, border-color .2s ease;
}
.contact-value a:hover{color:var(--accent);border-color:var(--accent)}
.contact-meta{
  margin:0 !important;
  font-size:13px;
  color:var(--faint);
}