/* FlashStacks — marketing site. Design tokens mirror the app's DesignSystem.swift */

:root {
  --bg:            #0A0A1A;
  --bg-raised:     rgba(255, 255, 255, 0.08);
  --bg-raised-2:   rgba(255, 255, 255, 0.12);
  --border:        rgba(255, 255, 255, 0.15);
  --text:          #FFFFFF;
  --text-2:        rgba(255, 255, 255, 0.72);
  --text-3:        rgba(255, 255, 255, 0.5);
  --lavender:      #6C5CE7;
  --ultraviolet:   #7C4DFF;
  --mint:          #00CC99;
  --blue:          #2684FF;
  --coral:         #FF5A45;
  --radius:        16px;
  --radius-lg:     24px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-rounded: ui-rounded, "SF Pro Rounded", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* ── Layout ────────────────────────────────────────── */
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
section { padding: 72px 0; }

/* ── Header ────────────────────────────────────────── */
header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(10, 10, 26, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.nav-brand {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-rounded); font-weight: 700; font-size: 19px;
  color: var(--text); text-decoration: none;
}
.nav-brand img { width: 32px; height: 32px; border-radius: 8px; }
.nav-links { display: flex; gap: 28px; align-items: center; }
.nav-links a {
  color: var(--text-2); text-decoration: none; font-size: 15px; font-weight: 500;
}
.nav-links a:hover { color: var(--text); }
.nav-cta {
  background: var(--text); color: var(--bg) !important;
  padding: 8px 18px; border-radius: 999px; font-weight: 600 !important;
}
@media (max-width: 720px) { .nav-links a:not(.nav-cta) { display: none; } }

/* ── Hero ──────────────────────────────────────────── */
.hero {
  position: relative; overflow: hidden;
  padding: 96px 0 80px;
  text-align: center;
}
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background:
    radial-gradient(ellipse 60% 50% at 20% 10%, rgba(108, 92, 231, 0.35), transparent 60%),
    radial-gradient(ellipse 50% 45% at 80% 20%, rgba(124, 77, 255, 0.28), transparent 60%),
    radial-gradient(ellipse 55% 40% at 50% 90%, rgba(0, 204, 153, 0.12), transparent 65%);
}
.hero h1 {
  font-family: var(--font-rounded);
  font-size: clamp(38px, 6vw, 62px);
  font-weight: 800; line-height: 1.12; letter-spacing: -0.02em;
  max-width: 800px; margin: 0 auto 20px;
}
.hero .accent {
  background: linear-gradient(120deg, #A78BFA, var(--ultraviolet));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p.sub {
  font-size: clamp(17px, 2.4vw, 21px);
  color: var(--text-2); max-width: 620px; margin: 0 auto 36px;
}

/* ── Buttons ───────────────────────────────────────── */
.btn-row { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 28px; border-radius: 999px;
  font-weight: 600; font-size: 16px; text-decoration: none;
  transition: transform 0.15s ease, opacity 0.15s ease;
}
.btn:hover { transform: scale(1.03); }
.btn-primary { background: var(--text); color: var(--bg); }
.btn-ghost {
  color: var(--text); border: 1px solid var(--border);
  background: var(--bg-raised);
}

/* ── Phone mockup ──────────────────────────────────── */
.phone {
  width: 300px; margin: 64px auto 0;
  border: 10px solid #1c1c2e; border-radius: 44px;
  background: linear-gradient(160deg, #171730, #0d0d20);
  padding: 22px 16px; box-shadow: 0 40px 100px rgba(108, 92, 231, 0.25);
}
.widget-card {
  background: linear-gradient(140deg, var(--lavender), var(--ultraviolet));
  border-radius: 20px; padding: 20px; text-align: left;
  font-family: var(--font-rounded);
}
.widget-card .deck { font-size: 11px; opacity: 0.75; font-weight: 600; letter-spacing: 0.4px; }
.widget-card .q { font-size: 17px; font-weight: 700; margin: 8px 0 14px; line-height: 1.35; }
.widget-card .hint {
  display: inline-block; font-size: 12px; font-weight: 600;
  background: rgba(255,255,255,0.22); padding: 5px 12px; border-radius: 999px;
}
.phone .icon-row { display: flex; gap: 14px; margin-top: 20px; justify-content: center; }
.phone .app-dot { width: 44px; height: 44px; border-radius: 11px; background: var(--bg-raised-2); }

/* ── Feature grid ──────────────────────────────────── */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
.card {
  background: var(--bg-raised); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 28px;
}
.card .emoji-tile {
  width: 48px; height: 48px; border-radius: 13px;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; margin-bottom: 16px;
  background: linear-gradient(140deg, rgba(108,92,231,0.35), rgba(124,77,255,0.2));
}
.card h3 { font-family: var(--font-rounded); font-size: 20px; margin-bottom: 8px; }
.card p { color: var(--text-2); font-size: 15.5px; }

/* ── Section headings ──────────────────────────────── */
.kicker {
  display: block; font-size: 13px; font-weight: 700; letter-spacing: 1.6px;
  text-transform: uppercase; color: #A78BFA; margin-bottom: 12px;
}
h2 {
  font-family: var(--font-rounded);
  font-size: clamp(28px, 4vw, 40px); font-weight: 800;
  letter-spacing: -0.015em; line-height: 1.2; margin-bottom: 16px;
}
.section-head { max-width: 640px; margin-bottom: 44px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head p { color: var(--text-2); font-size: 18px; }

/* ── Prose (long-form SEO pages) ───────────────────── */
.prose { max-width: 720px; margin: 0 auto; }
.prose h1 {
  font-family: var(--font-rounded);
  font-size: clamp(32px, 5vw, 48px); font-weight: 800;
  line-height: 1.15; letter-spacing: -0.02em; margin-bottom: 18px;
}
.prose h2 { font-size: clamp(24px, 3.4vw, 32px); margin: 48px 0 14px; }
.prose h3 { font-family: var(--font-rounded); font-size: 21px; margin: 32px 0 10px; }
.prose p { color: var(--text-2); margin-bottom: 18px; }
.prose ul, .prose ol { color: var(--text-2); margin: 0 0 18px 24px; }
.prose li { margin-bottom: 8px; }
.prose strong { color: var(--text); }
.prose a { color: #A78BFA; }
.prose .lead { font-size: 20px; color: var(--text-2); }

/* ── Comparison table ──────────────────────────────── */
.compare { width: 100%; border-collapse: collapse; margin: 24px 0; font-size: 15px; }
.compare th, .compare td { padding: 13px 16px; text-align: left; border-bottom: 1px solid var(--border); }
.compare th { font-family: var(--font-rounded); font-size: 14px; color: var(--text-3); text-transform: uppercase; letter-spacing: 0.8px; }
.compare td:first-child { color: var(--text); font-weight: 500; }
.compare td { color: var(--text-2); }
.compare .yes { color: var(--mint); font-weight: 600; }
.compare .no { color: var(--text-3); }
.table-scroll { overflow-x: auto; }

/* ── FAQ ───────────────────────────────────────────── */
.faq details {
  background: var(--bg-raised); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px 24px; margin-bottom: 12px;
}
.faq summary {
  font-family: var(--font-rounded); font-weight: 600; font-size: 17px;
  cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center;
}
.faq summary::after { content: "+"; font-size: 22px; color: var(--text-3); }
.faq details[open] summary::after { content: "–"; }
.faq details p { color: var(--text-2); margin-top: 12px; font-size: 15.5px; }

/* ── CTA band ──────────────────────────────────────── */
.cta-band {
  text-align: center; border-radius: var(--radius-lg);
  padding: 64px 32px; position: relative; overflow: hidden;
  background:
    radial-gradient(ellipse 70% 90% at 50% 0%, rgba(124, 77, 255, 0.4), transparent 70%),
    var(--bg-raised);
  border: 1px solid var(--border);
}
.cta-band h2 { margin-bottom: 12px; }
.cta-band p { color: var(--text-2); margin-bottom: 28px; }

/* ── Footer ────────────────────────────────────────── */
footer {
  border-top: 1px solid rgba(255,255,255,0.07);
  padding: 48px 0; margin-top: 40px;
  color: var(--text-3); font-size: 14px;
}
.foot { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.foot a { color: var(--text-3); text-decoration: none; margin-right: 20px; }
.foot a:hover { color: var(--text); }

/* ── Breadcrumb ────────────────────────────────────── */
.crumb { font-size: 14px; color: var(--text-3); margin-bottom: 24px; }
.crumb a { color: var(--text-3); }