/* =========================================
   Base Reset & Tokens (Google-like polish)
   ========================================= */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  /* Surfaces */
  --bg: #ffffff;
  --elev-1: #ffffff;     /* cards */
  --elev-2: #fafbff;     /* subtle surfaces */

  /* Text */
  --text: #1f1f1f;
  --text-secondary: #5f6368; /* Google-like neutral */

  /* Brand / Accent */
  --primary: #1a73e8;         /* Google blue */
  --primary-strong: #185abc;  /* hover/active */
  --gradient: linear-gradient(90deg, #1a73e8, #7b61ff);

  /* Borders & Dividers */
  --border: #e6e7eb;

  /* Effects */
  --radius: 16px;
  --radius-sm: 12px;
  --shadow-1: 0 1px 2px rgba(0,0,0,.06), 0 2px 8px rgba(0,0,0,.04);
  --shadow-2: 0 8px 30px rgba(0,0,0,.08);
  --shadow-focus: 0 0 0 3px rgba(26,115,232,.25);
  --transition: 220ms cubic-bezier(.2,.6,.2,1);

  /* Typography scale */
  --font-sans: Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  --step--1: clamp(13px, .88vw, 14px);
  --step-0: clamp(15px, 1vw, 16px);
  --step-1: clamp(18px, 1.8vw, 20px);
  --step-2: clamp(24px, 3vw, 32px);
  --step-3: clamp(32px, 4vw, 44px);

  /* Spacing scale (8pt-ish) */
  --sp-1: 8px;
  --sp-2: 12px;
  --sp-3: 16px;
  --sp-4: 20px;
  --sp-5: 28px;
  --sp-6: 36px;
  --sp-7: 48px;
  --sp-8: 72px;
}

/* Dark mode (auto) */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --elev-1: #14171d;
    --elev-2: #101319;
    --text: #eef2f7;
    --text-secondary: #aab2bf;
    --border: #232834;
    --shadow-1: 0 1px 2px rgba(0,0,0,.5), 0 2px 8px rgba(0,0,0,.35);
    --shadow-2: 0 14px 40px rgba(0,0,0,.45);
    --shadow-focus: 0 0 0 3px rgba(104,154,255,.35);
  }
}

html { scroll-behavior: smooth; }
body {
  background:
    radial-gradient(1200px 800px at 80% -10%, rgba(26,115,232,.08), transparent 60%),
    radial-gradient(900px 600px at -10% 20%, rgba(123,97,255,.08), transparent 50%),
    var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-family: var(--font-sans);
  font-size: var(--step-0);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Respect reduced motion users */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

/* ==========================
   Header / Navigation
   ========================== */
header {
  position: fixed;
  inset: 0 0 auto 0;
  background: color-mix(in oklab, var(--bg), transparent 20%);
  backdrop-filter: saturate(1.1) blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
}

nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--sp-3) var(--sp-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 700;
  letter-spacing: -0.3px;
  color: var(--text);
  /* subtle brand accent underline */
  position: relative;
}
.logo::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 28%;
  height: 2px;
  background: var(--gradient);
  border-radius: 2px;
  opacity: .75;
}

nav ul {
  list-style: none;
  display: flex;
  gap: clamp(18px, 3vw, 32px);
}

nav ul a {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  padding: 8px 12px;
  border-radius: 999px;            /* pill */
  transition: color var(--transition), background var(--transition), box-shadow var(--transition), transform var(--transition);
  position: relative;
}

nav ul a:hover {
  color: var(--primary);
  background: color-mix(in oklab, var(--primary) 12%, transparent);
}

nav ul a:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
  background: color-mix(in oklab, var(--primary) 15%, transparent);
}

nav ul a[aria-current="page"],
nav ul a.active {
  color: var(--primary);
  background: color-mix(in oklab, var(--primary) 18%, transparent);
}

/* ==========================
   Sections & Typography
   ========================== */
section {
  max-width: 1000px;
  margin: 0 auto;
  padding: clamp(120px, 22vh, 180px) var(--sp-4) var(--sp-7);
  text-align: center;
}

#home { padding-top: clamp(160px, 28vh, 220px); }

h2 {
  font-size: var(--step-2);
  font-weight: 750;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: var(--sp-3);
  color: transparent;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  text-wrap: balance;
}

p {
  font-size: var(--step-0);
  color: var(--text-secondary);
  max-width: 720px;
  margin: 0 auto var(--sp-5);
  text-wrap: pretty;
}

/* Soft section divider vibe */
section + section {
  position: relative;
}
section + section::before {
  content: "";
  position: absolute;
  top: 0; left: 50%;
  transform: translateX(-50%);
  width: min(82%, 880px);
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
  opacity: .8;
}

/* ==========================
   Buttons (CTA)
   ========================== */
.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  font-weight: 600;
  font-size: var(--step-0);
  text-decoration: none;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), filter var(--transition);
  box-shadow: 0 6px 18px rgba(26,115,232,.28);
  will-change: transform;
}
.btn:hover {
  transform: translateY(-2px);
  background: var(--primary-strong);
  box-shadow: 0 12px 28px rgba(26,115,232,.33);
}
.btn:active {
  transform: translateY(0);
  filter: brightness(.98);
}
.btn:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus), 0 8px 22px rgba(26,115,232,.25);
}

/* Secondary / ghost style (if you apply .btn.btn--ghost in HTML) */
.btn.btn--ghost {
  background: transparent;
  color: var(--primary);
  border: 1px solid color-mix(in oklab, var(--primary) 35%, var(--border));
  box-shadow: none;
}
.btn.btn--ghost:hover {
  background: color-mix(in oklab, var(--primary) 12%, transparent);
}

/* ==========================
   Feature Grid (Cards)
   ========================== */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: clamp(18px, 3vw, 32px);
  margin-top: var(--sp-6);
}

.feature {
  padding: clamp(24px, 3.5vw, 36px);
  border-radius: var(--radius);
  background: var(--elev-1);
  border: 1px solid var(--border);
  text-align: left;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  box-shadow: var(--shadow-1);
  transform: translateZ(0);
}

.feature:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-2);
  border-color: color-mix(in oklab, var(--primary) 24%, var(--border));
}

.feature i {
  font-size: clamp(22px, 2.2vw, 26px);
  color: var(--primary);
  margin-bottom: var(--sp-2);
}

.feature h3 {
  font-size: var(--step-1);
  font-weight: 650;
  margin-bottom: var(--sp-2);
  letter-spacing: -0.015em;
}

/* Optional subtle badge style if you place <small> inside .feature */
.feature small {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 999px;
  background: color-mix(in oklab, var(--primary) 12%, transparent);
  color: var(--primary);
  font-size: var(--step--1);
  font-weight: 600;
}

/* ==========================
   Download section links
   ========================== */
#download a {
  margin-top: var(--sp-1);
}

#download p a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
  border-bottom: 1px dashed color-mix(in oklab, var(--primary) 45%, transparent);
  transition: color var(--transition), border-color var(--transition);
}
#download p a:hover {
  color: var(--primary-strong);
  border-color: var(--primary-strong);
}

/* ==========================
   Footer
   ========================== */
footer {
  border-top: 1px solid var(--border);
  padding: var(--sp-5);
  text-align: center;
  font-size: var(--step--1);
  color: color-mix(in oklab, var(--text-secondary) 92%, var(--text));
  background: var(--elev-2);
}

.social-icons {
  margin-top: var(--sp-2);
}

.social-icons a {
  margin: 0 12px;
  color: var(--text-secondary);
  font-size: 20px;
  transition: transform var(--transition), color var(--transition), text-shadow var(--transition);
}
.social-icons a:hover {
  color: var(--primary);
  transform: translateY(-2px);
  text-shadow: 0 6px 18px rgba(26,115,232,.25);
}

/* ==========================
   Responsive
   ========================== */
@media (max-width: 768px) {
  nav ul { display: none; }
  section { padding: 120px var(--sp-3) var(--sp-6); }
  h2 { font-size: clamp(24px, 7vw, 34px); }
}

/* ==========================
   Bonus: subtle reveal on scroll
   (applies automatically once added class .reveal)
   ========================== */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 500ms ease, transform 600ms ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ==========================
   Optional: Search-like input style
   (If you add <input class="search"> in your HTML)
   ========================== */
.search {
  width: min(680px, 92%);
  margin: 0 auto var(--sp-5);
  padding: 12px 16px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--elev-1);
  color: var(--text);
  box-shadow: var(--shadow-1);
  transition: box-shadow var(--transition), border-color var(--transition), background var(--transition);
}
.search::placeholder { color: var(--text-secondary); }
.search:focus {
  outline: none;
  border-color: color-mix(in oklab, var(--primary) 30%, var(--border));
  box-shadow: var(--shadow-focus), var(--shadow-1);
}