/* =========================================================================
   📁 FILE: /static/css/landing/phone.css
   🧿 BRISTLE · PHONE LANDING · iOS VISION PRO GLASS (LIGHT · SINGLE MODE)
   ========================================================================= */


/* ========================================================================
   TOKENS & FALLBACK
   ======================================================================== */
:root{
  --font-ui: -apple-system, BlinkMacSystemFont, "SF Pro Text","SF Pro Display","Helvetica Neue", Arial, system-ui, sans-serif;

  --fg-1: #0b0c0f;
  --fg-2: #444;
  --fg-3: #777;

  --glass-soft: rgba(255,255,255,.78);
  --glass-bold: rgba(255,255,255,.94);
  --glass-shadow: 0 18px 36px rgba(10,10,10,.08);

  --accent: #2d6bff;
  --accent-soft: #7aa7ff;

  --r-sm: 14px;
  --r: 22px;
  --r-lg: 28px;

  --blur: 18px;
  --ease: cubic-bezier(.22,.61,.36,1);
  --dur: .26s;

  --bg-image: url("https://bristle.cloud/static/img/background/bg-2.webp");

  --phone-w: clamp(300px, 90vw, 420px);
}


/* ========================================================================
   BASE & CANVAS
   ======================================================================== */
*{box-sizing:border-box}
html, body { height:100svh; overscroll-behavior:none }
html{ font-size:12px }
body{
  margin:0;
  color:var(--fg-1);
  font-family:var(--font-ui);
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
  display:grid; place-items:center;
  background:
    radial-gradient(1200px 720px at 12% 8%, rgba(255,255,255,.55), transparent 60%),
    radial-gradient(1000px 560px at 88% 16%, rgba(255,255,255,.40), transparent 70%),
    radial-gradient(1200px 760px at 50% 115%, rgba(180,210,255,.26), transparent 78%);
}


/* ========================================================================
   BLURRED BACKGROUND PHOTO (GLASSY BUT CLEAR)
   ======================================================================== */
.bg{
  position:fixed; inset:0; z-index:-1; overflow:hidden;
}
.bg::before{
  content:""; position:absolute; inset:-4vmax;
  background: var(--bg-image) center/cover fixed no-repeat;
  filter: blur(14px) saturate(110%);
  transform: scale(1.03);
}
.bg::after{
  content:""; position:absolute; inset:-2vmax;
  background:
    radial-gradient(120% 120% at 50% 50%, transparent 58%, rgba(255,255,255,.38) 100%),
    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='120' height='120'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2'/><feComponentTransfer><feFuncA type='table' tableValues='0 0 .02 .05 .06 .08 .1 .12 .14 .16 .18 .2'/></feComponentTransfer></filter><rect width='100%' height='100%' filter='url(%23n)' opacity='.08'/></svg>") repeat;
  mix-blend-mode:soft-light;
  -webkit-mask-image: radial-gradient(120% 120% at 50% 50%, #000 72%, transparent 100%);
          mask-image: radial-gradient(120% 120% at 50% 50%, #000 72%, transparent 100%);
}


/* ========================================================================
   PHONE BLOCK (TRANSPARENT)
   ======================================================================== */
.phone{
  width:var(--phone-w);
  border-radius:var(--r-lg);
  padding:22px 28px;
  background: transparent;
  border: none;
  box-shadow: none;
  position:relative; z-index:1; isolation:isolate;
}
.hero{text-align:center}
.avatar{width:100%;display:grid;place-items:center;margin-bottom:12px}
.avatar img{width:250px;height:250px;object-fit:contain;opacity:.98}
.phone.compact{padding:18px 22px;border-radius:var(--r)}


/* ========================================================================
   BUTTONS · TRANSPARENT WITH SOFT BORDER
   ======================================================================== */
.links{display:grid;gap:10px}
.btn{
  display:flex;align-items:center;justify-content:center;gap:10px;
  text-decoration:none;color:var(--fg-1);
  font-weight:700;letter-spacing:.025em;font-size:.92rem;
  padding:12px 14px;border-radius:999px;
  background:transparent;
  border:1px solid rgba(255,255,255,.58);
  box-shadow:0 8px 20px rgba(0,0,0,.06);
  transition:border-color var(--dur) var(--ease), color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.btn i{font-size:12px;opacity:.95}
.btn:hover{border-color:rgba(255,255,255,.82);box-shadow:0 12px 26px rgba(0,0,0,.08)}
.btn:focus-visible{outline:0;box-shadow:0 0 0 3px rgba(45,107,255,.15),0 8px 20px rgba(0,0,0,.06)}
.btn.primary{color:#0b0c0f;border-color:rgba(45,107,255,.55);box-shadow:0 10px 22px rgba(45,107,255,.12)}
.btn.primary:hover{border-color:rgba(27,80,214,.72)}
.btn.ghost{opacity:.95}
.btn.ghost:hover{opacity:1}


/* ========================================================================
   FOOTER · TAGLINE · SOCIAL
   ======================================================================== */
.foot{text-align:center;margin-top:32px}
.social{display:flex;justify-content:center;gap:10px;margin-bottom:32px}
.social a{
  width:34px;height:34px;display:grid;place-items:center;border-radius:999px;
  color:var(--fg-1);text-decoration:none;
  background: var(--glass-soft);
  border:none;
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  box-shadow: 0 10px 22px rgba(0,0,0,.06);
  transition:background var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
}
.social a:hover{background:var(--glass-bold);box-shadow:0 14px 30px rgba(0,0,0,.08)}


/* ========================================================================
   CTA INLINE
   ======================================================================== */
.cta-inline{
  display:inline-flex;align-items:center;margin-left:6px;text-decoration:none;
  text-transform:uppercase;letter-spacing:.06em;font-weight:800;font-size:11px;line-height:1;color:var(--fg-1)
}
.cta-inline:hover{text-decoration:underline}


/* ========================================================================
   TAGLINE · BRANDED SHEEN (SUBTLE)
   ======================================================================== */
.tagline{
  margin:.4rem 0 12px;
  background-image: linear-gradient(90deg, var(--accent) 0%, var(--accent-soft) 50%, var(--accent) 100%);
  background-size: 220% 100%;
  -webkit-background-clip:text; background-clip:text;
  -webkit-text-fill-color:transparent;
  text-shadow: 0 1px 1px rgba(255,255,255,.18);
  font-weight:600; letter-spacing:.005em;
}
.tagline .cta-inline{ -webkit-text-fill-color: var(--fg-1); color:var(--fg-1) }
@keyframes bristleSheen{ 0%{background-position:0% 50%} 100%{background-position:220% 50%} }
@media (prefers-reduced-motion:no-preference){ .tagline{ animation:bristleSheen 8s linear infinite } }
@media (prefers-reduced-motion:reduce){ .tagline{ animation:none; background-position:50% 50% } }


/* ========================================================================
   PAGE-LOAD ANIMATIONS
   ======================================================================== */
@media (prefers-reduced-motion:no-preference){
  .bg{opacity:0;transform:scale(1.02);animation:bgFade 900ms ease-out forwards}
  .phone{opacity:0;transform:translateY(12px) scale(.992);animation:cardIn 620ms var(--ease) 120ms forwards;will-change:transform,opacity,filter}
  .avatar img{opacity:0;transform:translateY(-6px) scale(.96);filter:blur(6px);animation:dropIn 600ms var(--ease) 200ms forwards}
  .links .btn{opacity:0;transform:translateY(6px);animation:itemIn 520ms var(--ease) forwards}
  .links .btn:nth-child(1){animation-delay:260ms}
  .links .btn:nth-child(2){animation-delay:320ms}
  .links .btn:nth-child(3){animation-delay:380ms}
  .links .btn:nth-child(4){animation-delay:440ms}
  .foot{opacity:0;transform:translateY(6px);animation:itemIn 520ms var(--ease) 420ms forwards}
}
@keyframes bgFade{from{opacity:0;transform:scale(1.02)}to{opacity:1;transform:scale(1)}}
@keyframes cardIn{from{opacity:0;transform:translateY(12px) scale(.992)}to{opacity:1;transform:translateY(0) scale(1)}}
@keyframes dropIn{from{opacity:0;transform:translateY(-6px) scale(.96);filter:blur(6px)}to{opacity:1;transform:translateY(0) scale(1);filter:blur(0)}}
@keyframes itemIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}
@media (prefers-reduced-motion:reduce){
  .bg,.phone,.avatar img,.links .btn,.foot{animation:none!important;opacity:1!important;transform:none!important;filter:none!important}
}


/* ========================================================================
   RESPONSIVE · TABLET
   ======================================================================== */
@media (max-width:1024px){
  .phone{width:min(480px,94vw);padding:20px 18px;border-radius:var(--r)}
  .avatar img{width:200px;height:200px}
  .btn{padding:12px 14px}
  .social{margin-bottom:26px}
}


/* ========================================================================
   RESPONSIVE · MOBILE
   ======================================================================== */
@media (max-width:480px){
  .phone{width:92vw;padding:16px 14px;border-radius:var(--r-sm)}
  .avatar img{width:160px;height:160px}
  .btn{font-size:.9rem}
  .tagline{font-size:11px}
}