/* ==========================================================================
   InvoiceSense — landing page styles
   Design spec: DESIGN.md (dark, premium fintech)
   ========================================================================== */

:root {
  --bg: #05060a;
  --bg-soft: #0b0d14;
  --surface: #10131c;
  --surface-2: #161a26;
  --border: #1d2333;
  --text: #eef1f7;
  --text-soft: #9aa3b8;
  --text-faint: #5b6478;
  --accent: #6d5cff;
  --accent-2: #22d3a5;
  --accent-3: #ff5d8f;
  --gradient: linear-gradient(135deg, #7b6cff 0%, #22d3a5 55%, #ff5d8f 100%);
  --glow: rgba(109, 92, 255, 0.35);
  --radius: 16px;
  --radius-sm: 12px;
  --maxw: 1180px;
  --pad-x: clamp(20px, 5vw, 40px);
  --font: "Inter", -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

::selection { background: rgba(109, 92, 255, 0.4); color: #fff; }

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: 10px 16px;
  border-radius: 0 0 8px 0;
  z-index: 100;
}
.skip-link:focus { left: 0; }

/* ---------- Reusable ---------- */
.section { padding: clamp(80px, 12vh, 150px) var(--pad-x); max-width: var(--maxw); margin: 0 auto; }

.section-head { text-align: center; max-width: 720px; margin: 0 auto clamp(48px, 6vw, 72px); }

.eyebrow {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin-bottom: 14px;
}

.section-head h2 { font-size: clamp(1.9rem, 4vw, 2.75rem); font-weight: 700; letter-spacing: -0.03em; line-height: 1.15; }
.section-head p { color: var(--text-soft); margin-top: 14px; font-size: 1.0625rem; }

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 13px 22px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease, background 0.18s ease;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }

.btn-primary {
  background: linear-gradient(135deg, #7b6cff, #6d5cff);
  color: #fff;
  box-shadow: 0 8px 24px rgba(109, 92, 255, 0.35);
}
.btn-primary:hover { box-shadow: 0 12px 32px rgba(109, 92, 255, 0.5); }

.btn-ghost { background: var(--surface); border-color: var(--border); color: var(--text); }
.btn-ghost:hover { border-color: var(--accent); box-shadow: 0 0 0 1px rgba(109,92,255,.4); }

.btn-lg { padding: 16px 30px; font-size: 1.05rem; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text-soft);
  font-size: 0.85rem;
  font-weight: 500;
}
.badge .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent-2); box-shadow: 0 0 10px var(--accent-2); }

/* Reveal-on-scroll */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ---------- Nav ---------- */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  background: rgba(5, 6, 10, 0.72);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease;
}
.nav.scrolled { border-bottom-color: var(--border); }

.nav-inner { max-width: var(--maxw); margin: 0 auto; padding: 14px var(--pad-x); display: flex; align-items: center; justify-content: space-between; }

.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.05rem; }
.brand-mark { display: inline-flex; filter: drop-shadow(0 4px 14px var(--glow)); }
.brand-accent { background: var(--gradient); -webkit-background-clip: text; background-clip: text; color: transparent; }

.nav-links { display: flex; align-items: center; gap: 26px; font-size: 0.92rem; color: var(--text-soft); }
.nav-links a { transition: color 0.2s ease; }
.nav-links a:hover { color: var(--text); }
.nav-links .nav-cta {
  color: #fff;
  background: var(--accent);
  padding: 9px 18px;
  border-radius: 10px;
  font-weight: 600;
  box-shadow: 0 6px 18px var(--glow);
}
.nav-links .nav-cta:hover { color: #fff; box-shadow: 0 8px 24px rgba(109,92,255,.5); }

.nav-toggle { display: none; background: none; border: 1px solid var(--border); border-radius: 8px; padding: 9px 10px; cursor: pointer; flex-direction: column; gap: 4px; }
.nav-toggle span { width: 20px; height: 2px; background: var(--text); border-radius: 2px; transition: 0.25s ease; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero { position: relative; min-height: 100vh; display: grid; place-items: center; text-align: center; padding: 130px var(--pad-x) 70px; overflow: hidden; }

.hero-bg { position: absolute; inset: 0; z-index: -1; }
.glow { position: absolute; border-radius: 50%; filter: blur(90px); opacity: 0.45; }
.glow-a { width: 640px; height: 640px; top: -220px; left: 50%; transform: translateX(-50%); background: radial-gradient(circle, rgba(109,92,255,.5), transparent 65%); }
.glow-b { width: 520px; height: 520px; top: 140px; left: -180px; background: radial-gradient(circle, rgba(34,211,165,.28), transparent 65%); }
.glow-c { width: 520px; height: 520px; top: 220px; right: -180px; background: radial-gradient(circle, rgba(255,93,143,.22), transparent 65%); }
.grid-overlay {
  position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,.035) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255,255,255,.035) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, #000 20%, transparent 70%);
  mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, #000 20%, transparent 70%);
}

.hero-inner { max-width: 900px; display: flex; flex-direction: column; align-items: center; gap: 26px; }

.hero h1 { font-size: clamp(2.6rem, 6.4vw, 4.75rem); font-weight: 800; letter-spacing: -0.035em; line-height: 1.05; }

.lead { color: var(--text-soft); font-size: clamp(1.05rem, 1.6vw, 1.25rem); max-width: 640px; }

.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; justify-content: center; margin-top: 8px; }

.hero-meta { display: flex; gap: 22px; flex-wrap: wrap; justify-content: center; font-size: 0.9rem; color: var(--text-faint); margin-top: 18px; }
.hero-meta li { color: var(--text-soft); }

/* ---------- Metrics strip ---------- */
.metrics { border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); background: var(--bg-soft); }
.metrics-inner { max-width: var(--maxw); margin: 0 auto; padding: 40px var(--pad-x); display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.metric { display: flex; flex-direction: column; gap: 6px; }
.metric-num { font-size: clamp(1.6rem, 3vw, 2.2rem); font-weight: 800; letter-spacing: -0.02em; }
.metric-label { color: var(--text-faint); font-size: 0.9rem; }

/* ---------- Features grid ---------- */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 26px;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  position: relative;
}
.card:hover { transform: translateY(-4px); border-color: rgba(109, 92, 255, 0.55); box-shadow: 0 18px 40px rgba(0,0,0,.4), 0 0 0 1px rgba(109,92,255,.25); }

.card-icon { display: inline-flex; align-items: center; justify-content: center; width: 46px; height: 46px; border-radius: 12px; font-size: 1.3rem; background: color-mix(in srgb, var(--ic, var(--accent)) 14%, transparent); border: 1px solid color-mix(in srgb, var(--ic, var(--accent)) 30%, transparent); margin-bottom: 16px; }

.card h3 { font-size: 1.125rem; font-weight: 700; margin-bottom: 8px; letter-spacing: -0.01em; }
.card p { color: var(--text-soft); font-size: 0.95rem; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.chips span { font-family: var(--mono); font-size: 0.76rem; color: var(--text-soft); background: var(--bg-soft); border: 1px solid var(--border); border-radius: 999px; padding: 5px 11px; }

/* ---------- Industries ---------- */
.industries-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.industries-list li { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 18px 20px; display: flex; align-items: center; gap: 12px; font-weight: 600; font-size: 0.97rem; transition: transform 0.2s ease, border-color 0.2s ease; }
.industries-list li:hover { transform: translateY(-2px); border-color: rgba(109, 92, 255, 0.55); }
.industries-list li span { font-size: 1.4rem; }

/* ---------- Steps ---------- */
.steps { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-bottom: 70px; }
.step { display: flex; gap: 18px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; }
.step-num { font-family: var(--mono); font-size: 1rem; color: var(--accent-2); font-weight: 700; padding-top: 2px; }
.step h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 6px; }
.step p { color: var(--text-soft); font-size: 0.93rem; }

/* ---------- Mockup ---------- */
.mockup {
  background: linear-gradient(180deg, var(--surface-2), var(--surface));
  border: 1px solid var(--border);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 40px 90px rgba(0,0,0,.5), 0 0 60px rgba(109,92,255,.08);
}
.mockup-bar { display: flex; align-items: center; gap: 8px; padding: 12px 16px; border-bottom: 1px solid var(--border); }
.mock-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--border); }
.mock-dot:nth-child(1) { background: #ff5d5d; }
.mock-dot:nth-child(2) { background: #f5b342; }
.mock-dot:nth-child(3) { background: #22d3a5; }
.mock-title { margin-left: 12px; font-family: var(--mono); font-size: 0.72rem; color: var(--text-faint); }
.mockup-body { display: grid; grid-template-columns: 64px 1fr; min-height: 340px; }
.mock-side { border-right: 1px solid var(--border); padding: 16px 10px; display: flex; flex-direction: column; gap: 10px; }
.mock-menu { height: 8px; border-radius: 4px; background: var(--border); }
.mock-menu.active { background: var(--accent); box-shadow: 0 0 12px var(--glow); }
.mock-main { padding: 20px; display: flex; flex-direction: column; gap: 18px; }
.mock-kpis { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.mock-kpi { border: 1px solid var(--border); border-radius: 12px; padding: 14px; display: flex; flex-direction: column; gap: 10px; background: var(--bg-soft); }
.kpi-bar { height: 8px; width: 60%; border-radius: 4px; background: var(--border); }
.kpi-num { height: 14px; width: 70%; border-radius: 4px; background: linear-gradient(90deg, var(--accent), var(--accent-2)); opacity: .7; }
.mock-chart { border: 1px solid var(--border); border-radius: 12px; padding: 18px; display: flex; align-items: flex-end; gap: 10px; height: 150px; background: var(--bg-soft); }
.chart-line { flex: 1; border-radius: 6px 6px 0 0; background: linear-gradient(180deg, rgba(109,92,255,.9), rgba(109,92,255,.15)); }
.chart-line:nth-child(1) { height: 40%; }
.chart-line:nth-child(2) { height: 65%; }
.chart-line:nth-child(3) { height: 50%; }
.chart-line:nth-child(4) { height: 85%; }
.chart-line:nth-child(5) { height: 70%; background: linear-gradient(180deg, rgba(34,211,165,.9), rgba(34,211,165,.15)); }
.mock-rows { display: flex; flex-direction: column; gap: 10px; }
.mock-row { height: 12px; border-radius: 4px; background: var(--border); }
.mock-row:nth-child(2) { width: 85%; }
.mock-row:nth-child(3) { width: 60%; }

/* ---------- Pricing ---------- */
.price-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; align-items: stretch; }
.price-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 28px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  position: relative;
}
.price-card.featured { border-color: rgba(109, 92, 255, 0.6); box-shadow: 0 20px 60px rgba(109, 92, 255, 0.18); background: linear-gradient(180deg, rgba(109,92,255,.08), var(--surface) 45%); }
.featured-tag { position: absolute; top: -13px; left: 50%; transform: translateX(-50%); font-family: var(--mono); font-size: 0.7rem; text-transform: uppercase; letter-spacing: .1em; padding: 5px 12px; border-radius: 999px; background: var(--gradient); color: #05060a; font-weight: 700; white-space: nowrap; }

.price-card h3 { font-size: 1.15rem; font-weight: 700; }
.price { display: flex; align-items: baseline; gap: 4px; flex-wrap: wrap; }
.price .cur { font-size: 1.2rem; color: var(--text-soft); }
.price .per { color: var(--text-faint); font-size: 0.9rem; margin-left: 4px; white-space: normal; }
.price-card ul { display: flex; flex-direction: column; gap: 10px; margin: 4px 0 10px; flex: 1; }
.price-card li { color: var(--text-soft); font-size: 0.95rem; padding-left: 24px; position: relative; }
.price-card li::before { content: "✓"; position: absolute; left: 0; color: var(--accent-2); font-weight: 700; }

/* ---------- FAQ ---------- */
.faq-list { max-width: 760px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 0 20px; }
.faq-item summary { cursor: pointer; padding: 18px 0; font-weight: 600; font-size: 1.02rem; list-style: none; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; font-size: 1.3rem; color: var(--accent); transition: transform 0.25s ease; }
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item p { color: var(--text-soft); padding: 0 0 20px; font-size: 0.95rem; }
.faq-item a { color: var(--accent-2); text-decoration: underline; }

/* ---------- CTA band ---------- */
.cta-band { text-align: center; background: var(--bg-soft); border: 1px solid var(--border); border-radius: 24px; }
.cta-band h2 { font-size: clamp(1.9rem, 4vw, 2.6rem); font-weight: 700; letter-spacing: -0.03em; margin-bottom: 12px; }
.cta-band p { color: var(--text-soft); margin-bottom: 26px; }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--border); background: var(--bg-soft); margin-top: 60px; }
.footer-inner { max-width: var(--maxw); margin: 0 auto; padding: 60px var(--pad-x) 30px; display: grid; grid-template-columns: 1.4fr 1fr; gap: 40px; }
.footer-brand p { color: var(--text-soft); font-size: 0.95rem; margin-top: 12px; max-width: 320px; }
.footer-brand .contact { margin-top: 16px; }
.footer-brand .contact a { color: var(--accent-2); font-weight: 600; }
.footer-cols { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.footer-cols h4 { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.14em; color: var(--text-faint); margin-bottom: 14px; }
.footer-cols a { display: block; color: var(--text-soft); font-size: 0.93rem; margin-bottom: 10px; transition: color 0.2s ease; }
.footer-cols a:hover { color: var(--text); }
.footer-bottom { max-width: var(--maxw); margin: 0 auto; padding: 22px var(--pad-x); border-top: 1px solid var(--border); display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: 0.85rem; color: var(--text-faint); }
.mono { font-family: var(--mono); }

/* ---------- Floating WhatsApp ---------- */
.wa-float {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 60;
  width: 58px;
  height: 58px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #25d366, #128c7e);
  color: #fff;
  box-shadow: 0 10px 26px rgba(37, 211, 102, 0.45);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.wa-float:hover { transform: translateY(-3px) scale(1.05); box-shadow: 0 14px 34px rgba(37, 211, 102, 0.6); }
.wa-pulse { position: absolute; inset: 0; border-radius: 50%; background: rgba(37, 211, 102, 0.35); z-index: -1; animation: wa-pulse 2s ease-out infinite; }
@keyframes wa-pulse { 0% { transform: scale(1); opacity: 0.8; } 100% { transform: scale(1.7); opacity: 0; } }

@media (prefers-reduced-motion: reduce) {
  .wa-pulse { animation: none; }
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 1120px) {
  .price-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 980px) {
  .grid { grid-template-columns: repeat(2, 1fr); }
  .industries-list { grid-template-columns: repeat(2, 1fr); }
  .metrics-inner { grid-template-columns: repeat(2, 1fr); gap: 30px; }
}

@media (max-width: 820px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed;
    top: 62px; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 14px var(--pad-x) 22px;
    background: rgba(5, 6, 10, 0.96);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    transform: translateY(-120%);
    transition: transform 0.3s ease;
  }
  .nav-links.open { transform: none; }
  .nav-links a { padding: 12px 4px; border-bottom: 1px solid var(--border); }
  .nav-links .nav-cta { text-align: center; border: none; }
  .steps { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  .grid { grid-template-columns: 1fr; }
  .price-grid { grid-template-columns: 1fr; }
  .industries-list { grid-template-columns: 1fr; }
  .hero-meta { flex-direction: column; gap: 8px; }
  .mockup-body { grid-template-columns: 44px 1fr; }
  .footer-cols { grid-template-columns: 1fr; }
}

/* ==========================================================================
   Reduced motion
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}