/* shared.css — Design System & Global Components for Traiky */
/* Premium Fitness & Nutrition aesthetic — Athletic Luxe dark theme */

/* ── DESIGN TOKENS ── */
:root{
  /* Brand palette */
  --blue:#0500fe;
  --blue-mid:#3a38ff;
  --blue-light:#6366f1;
  --aqua:#24fab0;
  --aqua-glow:rgba(36,250,176,.25);
  --aqua-dim:rgba(36,250,176,.08);
  --orange:#F97316;
  --orange-glow:rgba(249,115,22,.25);

  /* Surfaces */
  --bg:#040810;
  --bg-elevated:#0a1018;
  --bg-card:rgba(255,255,255,.035);
  --bg-card-hover:rgba(255,255,255,.06);
  --surface-glass:rgba(255,255,255,.04);
  --surface-glass-border:rgba(255,255,255,.08);

  /* Text */
  --text:#edf0f7;
  --text-secondary:#b0b8cc;
  --text-muted:#7a8499;
  --text-dim:rgba(174,180,194,.4);

  /* Functional */
  --stroke:rgba(255,255,255,.07);
  --stroke-hover:rgba(255,255,255,.14);
  --accent:var(--aqua);
  --cta:var(--blue);
  --cta-hover:var(--blue-mid);
  --danger:#ef4444;

  /* Spacing & shape */
  --radius:16px;
  --radius-sm:12px;
  --radius-lg:24px;
  --radius-xl:32px;

  /* Shadows */
  --shadow-sm:0 4px 12px rgba(0,0,0,.25);
  --shadow-md:0 12px 32px rgba(0,0,0,.4);
  --shadow-lg:0 24px 56px rgba(0,0,0,.55);
  --shadow-glow-aqua:0 0 40px rgba(36,250,176,.12);
  --shadow-glow-blue:0 0 40px rgba(5,0,254,.15);

  /* Typography */
  --font:'Barlow',system-ui,-apple-system,'Segoe UI',sans-serif;
  --font-display:'Outfit',system-ui,-apple-system,sans-serif;
  --font-condensed:'Barlow Condensed',var(--font);

  /* Layout */
  --container:1200px;
  --gap:24px;

  /* Transitions */
  --ease-out:cubic-bezier(.16,1,.3,1);
  --ease-spring:cubic-bezier(.34,1.56,.64,1);
  --duration-fast:150ms;
  --duration:250ms;
  --duration-slow:400ms;
}

/* ── RESET & BASE ── */
*{box-sizing:border-box}
html,body{height:100%}
html{scroll-behavior:smooth}

body{
  margin:0;
  font-family:var(--font);
  font-weight:400;
  color:var(--text);
  background:var(--bg);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}

/* Ambient background glow — replaces flat bg */
body::after{
  content:'';
  position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:
    radial-gradient(ellipse 1100px 500px at 75% -5%,rgba(5,0,254,.14),transparent 50%),
    radial-gradient(ellipse 800px 450px at -5% 15%,rgba(36,250,176,.08),transparent 45%),
    radial-gradient(ellipse 600px 400px at 50% 95%,rgba(5,0,254,.06),transparent 50%);
}

img{max-width:100%;height:auto;display:block}
a{color:var(--accent);text-decoration:none;transition:color var(--duration) ease}
a:hover{color:#5bffc8}

/* ── LAYOUT ── */
.container{width:100%;max-width:var(--container);margin:auto;padding:0 24px}

/* ── TYPOGRAPHY ── */
h1,h2,h3,h4{
  font-family:var(--font-display);
  line-height:1.1;
  margin:0 0 .6rem;
  letter-spacing:-.02em;
}
h1{font-size:clamp(2.6rem,5.5vw,4.4rem);font-weight:800}
h2{font-size:clamp(1.8rem,3vw,2.8rem);font-weight:700}
h3{font-size:1.15rem;font-weight:600}
h4{font-size:1rem;font-weight:600}
p{margin:0 0 .6rem}

/* ── HEADER / NAV ── */
.header{
  position:sticky;top:0;z-index:100;
  background:rgba(4,8,16,.6);
  backdrop-filter:saturate(160%) blur(16px);
  -webkit-backdrop-filter:saturate(160%) blur(16px);
  border-bottom:1px solid var(--stroke);
  transition:background var(--duration) ease,box-shadow var(--duration) ease;
}
.header.scrolled{
  background:rgba(4,8,16,.88);
  box-shadow:0 4px 40px rgba(0,0,0,.5);
  border-bottom-color:rgba(255,255,255,.04);
}
.header .container{
  display:flex;align-items:center;justify-content:space-between;
  padding-top:14px;padding-bottom:14px;
}
.logo{height:30px;transition:opacity var(--duration) ease}
.logo:hover{opacity:.85}

.nav{display:flex;gap:8px;align-items:center}
.nav a{
  color:var(--text-secondary);font-size:.9rem;font-weight:500;
  padding:.45rem .75rem;border-radius:var(--radius-sm);
  transition:color var(--duration) ease,background var(--duration) ease;
  letter-spacing:.01em;
}
.nav a:hover{color:#fff;background:rgba(255,255,255,.06);text-decoration:none}
.nav a.btn{color:#fff;text-decoration:none;padding:.6rem 1.2rem}
.nav a.btn:hover{background:var(--cta-hover)}

/* Hamburger */
.nav-toggle{
  display:none;flex-direction:column;gap:5px;
  background:transparent;border:0;cursor:pointer;padding:6px;
  z-index:201;
}
.nav-toggle span{
  display:block;width:22px;height:2px;background:#eaf0ff;border-radius:2px;
  transition:transform var(--duration) var(--ease-out),opacity var(--duration) ease;
}

/* ── BUTTONS ── */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  padding:.75rem 1.5rem;border-radius:var(--radius-sm);border:1px solid transparent;
  font-family:var(--font-display);font-weight:600;font-size:.95rem;
  letter-spacing:.02em;cursor:pointer;
  transition:transform var(--duration) var(--ease-out),
             background var(--duration) ease,
             box-shadow var(--duration) ease,
             border-color var(--duration) ease;
  text-decoration:none;position:relative;overflow:hidden;
}
.btn:hover{text-decoration:none;transform:translateY(-2px)}
.btn:active{transform:translateY(0) scale(.98)}

.btn--primary{
  background:linear-gradient(135deg,var(--blue),var(--blue-mid));
  color:#fff;
  box-shadow:0 8px 24px rgba(5,0,254,.3),inset 0 1px 0 rgba(255,255,255,.1);
}
.btn--primary:hover{
  box-shadow:0 12px 32px rgba(5,0,254,.4),0 0 0 1px rgba(99,102,241,.3),inset 0 1px 0 rgba(255,255,255,.15);
  background:linear-gradient(135deg,var(--blue-mid),var(--blue-light));
}

.btn--accent{
  background:linear-gradient(135deg,var(--aqua),#5bffc8);
  color:#001a10;font-weight:700;
  box-shadow:0 8px 24px rgba(36,250,176,.2);
}
.btn--accent:hover{
  box-shadow:0 12px 32px rgba(36,250,176,.3),0 0 0 1px rgba(36,250,176,.2);
}

.btn--outline{
  background:transparent;
  border-color:var(--stroke-hover);
  color:#fff;
  backdrop-filter:blur(8px);
}
.btn--outline:hover{
  background:rgba(255,255,255,.06);
  border-color:rgba(255,255,255,.2);
}

.btn--ghost{background:transparent;color:var(--text-secondary)}
.btn--ghost:hover{color:#fff;background:rgba(255,255,255,.04)}

/* Button shimmer effect */
.btn--primary::before{
  content:'';position:absolute;top:0;left:-100%;width:60%;height:100%;
  background:linear-gradient(90deg,transparent,rgba(255,255,255,.08),transparent);
  transform:skewX(-15deg);transition:left .6s ease;
}
.btn--primary:hover::before{left:120%}

/* ── FOCUS STATES ── */
:focus-visible{
  outline:2px solid var(--aqua);outline-offset:3px;border-radius:4px;
}

/* ── SKIP LINK ── */
.skip-link{
  position:absolute;left:-9999px;top:4px;z-index:999;
  padding:.5rem 1rem;background:var(--aqua);color:#001118;
  border-radius:8px;font-weight:700;text-decoration:none;
}
.skip-link:focus{left:4px}

/* ── TOUCH OPTIMIZATION ── */
.btn,.nav a,.store-badge{touch-action:manipulation}

/* ── EYEBROW / SECTION LABEL ── */
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-condensed);
  font-size:.8rem;font-weight:600;letter-spacing:.16em;
  text-transform:uppercase;color:var(--aqua);
  margin-bottom:.7rem;
}
.eyebrow::before{
  content:'';display:block;width:24px;height:2px;
  background:linear-gradient(90deg,var(--aqua),transparent);
  border-radius:2px;
}

/* ── SECTION HEADER ── */
.section-header{margin-bottom:40px}
.section-header h2{
  max-width:600px;
}
.section-header p{
  color:var(--text-secondary);font-size:1.05rem;max-width:540px;
  margin-top:.5rem;
}

/* ── SCROLL REVEAL ── */
[data-reveal]{
  opacity:0;
  transform:translateY(32px);
  transition:opacity .7s var(--ease-out),transform .7s var(--ease-out);
}
[data-reveal].revealed{opacity:1;transform:translateY(0)}
[data-reveal][data-delay="1"]{transition-delay:.08s}
[data-reveal][data-delay="2"]{transition-delay:.16s}
[data-reveal][data-delay="3"]{transition-delay:.24s}
[data-reveal][data-delay="4"]{transition-delay:.32s}
[data-reveal][data-delay="5"]{transition-delay:.4s}

/* ── MOBILE NAV ── */
@media(max-width:860px){
  .nav{
    position:fixed;inset:0;z-index:200;
    flex-direction:column;justify-content:center;gap:6px;
    background:rgba(4,8,16,.98);
    backdrop-filter:blur(24px);
    -webkit-backdrop-filter:blur(24px);
    padding:24px;
    opacity:0;visibility:hidden;
    transition:opacity var(--duration-slow) var(--ease-out),
               visibility var(--duration-slow) ease;
  }
  .nav[aria-expanded="true"]{opacity:1;visibility:visible}
  .nav a{
    font-size:1.4rem;font-family:var(--font-display);font-weight:700;
    text-align:center;padding:12px;color:var(--text);
    transform:translateY(12px);opacity:0;
    transition:transform .4s var(--ease-out),opacity .4s ease,color var(--duration) ease,background var(--duration) ease;
  }
  .nav[aria-expanded="true"] a{transform:translateY(0);opacity:1}
  .nav[aria-expanded="true"] a:nth-child(1){transition-delay:.05s}
  .nav[aria-expanded="true"] a:nth-child(2){transition-delay:.1s}
  .nav[aria-expanded="true"] a:nth-child(3){transition-delay:.15s}
  .nav[aria-expanded="true"] a:nth-child(4){transition-delay:.2s}
  .nav[aria-expanded="true"] a:nth-child(5){transition-delay:.25s}
  .nav[aria-expanded="true"] a:nth-child(6){transition-delay:.3s}
  .nav-toggle{display:flex}
  .header .btn{width:100%}
}

/* ── REDUCED MOTION ── */
@media(prefers-reduced-motion:reduce){
  *{
    animation-duration:.01ms!important;
    animation-iteration-count:1!important;
    transition-duration:.01ms!important;
  }
  .skip-link{transition:none}
  [data-reveal]{opacity:1;transform:none;transition:none}
  .btn--primary::before{display:none}
}