/* ============================================================
   DESIGN TOKENS — Chirag Patel / Mobile Architect Portfolio
   Signature concept: the "build manifest" — every section reads
   like output from a build system (Gradle/Xcode), because that's
   literally what a decade of mobile-architecture work looks like.
   ============================================================ */

:root{
  /* ---- color: dark (default) ---- */
  --bg: #0A0C11;
  --bg-elevated: #10131B;
  --surface: rgba(255,255,255,0.045);
  --surface-strong: rgba(255,255,255,0.075);
  --border: rgba(255,255,255,0.09);
  --border-strong: rgba(255,255,255,0.16);

  --text-primary: #ECEEF5;
  --text-secondary: #A6ABBD;
  --text-tertiary: #6C7186;

  --primary: #6C5CE7;      /* indigo/purple */
  --primary-2: #4361EE;    /* blue */
  --accent: #22D3EE;       /* cyan */
  --accent-warm: #F5A623;  /* used sparingly for "warning/build" states */
  --ok: #34D399;

  --grad-primary: linear-gradient(135deg, var(--primary) 0%, var(--primary-2) 55%, var(--accent) 100%);
  --grad-radial: radial-gradient(circle at 20% -10%, rgba(108,92,231,0.35), transparent 55%),
                 radial-gradient(circle at 85% 10%, rgba(34,211,238,0.16), transparent 45%);

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.4);
  --shadow-md: 0 8px 30px rgba(0,0,0,0.45);
  --shadow-glow: 0 0 0 1px rgba(108,92,231,0.25), 0 20px 60px rgba(108,92,231,0.18);

  /* ---- type ---- */
  --font-display: 'Space Grotesk', 'Inter', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  --fs-h1: clamp(2.6rem, 5.4vw, 5rem);
  --fs-h2: clamp(2rem, 3.6vw, 3.1rem);
  --fs-h3: clamp(1.35rem, 2vw, 1.8rem);
  --fs-body: 1.05rem;
  --fs-small: 0.88rem;
  --fs-micro: 0.76rem;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-pill: 999px;

  --ease: cubic-bezier(.16,.84,.44,1);
  --dur-fast: .18s;
  --dur-med: .5s;
  --dur-slow: .9s;

  --maxw: 1180px;
  --gutter: clamp(20px, 5vw, 64px);
}

[data-theme="light"]{
  --bg: #F7F7FB;
  --bg-elevated: #FFFFFF;
  --surface: rgba(16,19,27,0.035);
  --surface-strong: rgba(16,19,27,0.06);
  --border: rgba(16,19,27,0.10);
  --border-strong: rgba(16,19,27,0.18);

  --text-primary: #12141C;
  --text-secondary: #4A4E5E;
  --text-tertiary: #7B7F91;

  --grad-radial: radial-gradient(circle at 20% -10%, rgba(108,92,231,0.14), transparent 55%),
                 radial-gradient(circle at 85% 10%, rgba(34,211,238,0.10), transparent 45%);

  --shadow-glow: 0 0 0 1px rgba(108,92,231,0.15), 0 20px 50px rgba(108,92,231,0.10);
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *,*::before,*::after{ animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important; scroll-behavior:auto !important; }
}

body{
  margin:0;
  background:var(--bg);
  background-image:var(--grad-radial);
  background-attachment:fixed;
  color:var(--text-primary);
  font-family:var(--font-body);
  font-size:var(--fs-body);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  transition:background-color var(--dur-med) var(--ease), color var(--dur-med) var(--ease);
}

h1,h2,h3,h4{
  font-family:var(--font-display);
  line-height:1.08;
  letter-spacing:-0.02em;
  margin:0;
  font-weight:600;
}

p{ margin:0; color:var(--text-secondary); }

a{ color:inherit; text-decoration:none; }

img{ max-width:100%; display:block; }

::selection{ background:var(--primary); color:#fff; }

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

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

.eyebrow{
  font-family:var(--font-mono);
  font-size:var(--fs-micro);
  letter-spacing:0.08em;
  text-transform:uppercase;
  color:var(--accent);
  display:inline-flex;
  align-items:center;
  gap:8px;
}
.eyebrow::before{
  content:'';
  width:6px; height:6px;
  border-radius:50%;
  background:var(--accent);
  box-shadow:0 0 0 3px rgba(34,211,238,0.18);
}

.section{
  padding-block: clamp(72px, 10vw, 140px);
  position:relative;
}

.section-head{
  max-width:640px;
  margin-bottom:clamp(36px, 6vw, 64px);
}
.section-head h2{ margin-top:14px; }
.section-head p{ margin-top:16px; font-size:1.05rem; }

.grad-text{
  background:var(--grad-primary);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}

.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:13px 24px;
  border-radius:var(--radius-pill);
  font-family:var(--font-body);
  font-weight:600;
  font-size:0.95rem;
  cursor:pointer;
  border:1px solid transparent;
  transition:transform var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
  white-space:nowrap;
}
.btn:active{ transform:scale(0.97); }
.btn-primary{
  background:var(--grad-primary);
  color:#fff;
  box-shadow:var(--shadow-glow);
}
.btn-primary:hover{ transform:translateY(-2px); box-shadow:0 0 0 1px rgba(108,92,231,0.35), 0 26px 70px rgba(108,92,231,0.28); }
.btn-ghost{
  background:var(--surface);
  border-color:var(--border);
  color:var(--text-primary);
  backdrop-filter:blur(12px);
}
.btn-ghost:hover{ border-color:var(--border-strong); background:var(--surface-strong); transform:translateY(-2px); }
.btn-sm{ padding:9px 16px; font-size:0.85rem; }

.card{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius-lg);
  backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  transition:border-color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}

.tag{
  font-family:var(--font-mono);
  font-size:var(--fs-micro);
  padding:5px 10px;
  border-radius:var(--radius-sm);
  background:var(--surface-strong);
  border:1px solid var(--border);
  color:var(--text-secondary);
}

.reveal{
  opacity:0;
  transform:translateY(24px);
  transition:opacity .7s var(--ease), transform .7s var(--ease);
}
.reveal.is-visible{ opacity:1; transform:translateY(0); }

.skip-link{
  position:absolute; left:-999px; top:0;
  background:var(--primary); color:#fff; padding:12px 18px;
  z-index:999; border-radius:0 0 8px 0;
}
.skip-link:focus{ left:0; }

.visually-hidden{
  position:absolute; width:1px; height:1px; overflow:hidden;
  clip:rect(0,0,0,0); white-space:nowrap;
}