/* ─────────────────────────────────────────────────────────────────────────────
   ∆-Hi! — Paper Kit-inspired custom styles
   Slick, minimal, professional. Light theme. Purple accent only.
───────────────────────────────────────────────────────────────────────────── */

:root {
  --bg:           #fafaf7;
  --surface:      #ffffff;
  --ink:          #0f0f12;
  --ink-soft:     #2a2a32;
  --muted:        #707082;
  --line:         #ececea;
  --line-strong:  #d8d8d4;
  --purple:       #5a4ab7;
  --purple-hover: #6e5dd4;
  --purple-soft:  rgba(90, 74, 183, 0.08);
  --teal:         #00a86b;
  --rose:         #d94f5c;
  --radius:       14px;
  --radius-lg:    20px;
  --shadow-sm:    0 2px 10px rgba(15, 15, 18, 0.04);
  --shadow-md:    0 8px 32px rgba(15, 15, 18, 0.06);
  --shadow-lg:    0 24px 64px rgba(15, 15, 18, 0.10);
  --font-display: 'Montserrat', -apple-system, sans-serif;
  --font-body:    -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono:    'SF Mono', 'JetBrains Mono', ui-monospace, monospace;
}

* { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.6;
  margin: 0;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink);
  line-height: 1.15;
}

a { color: var(--purple); text-decoration: none; transition: color 0.15s; }
a:hover { color: var(--purple-hover); }

/* ── Navbar ──────────────────────────────────────────────────────────────── */
.nav-bar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  padding: 18px 0;
  background: rgba(250, 250, 247, 0.85);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s, background 0.2s;
}
.nav-bar.scrolled { border-bottom-color: var(--line); background: rgba(250, 250, 247, 0.96); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.nav-brand { font-family: var(--font-display); font-weight: 800; font-size: 1.35rem; letter-spacing: -0.04em; color: var(--ink); }
.nav-brand .delta { color: var(--purple); }
.nav-brand:hover { color: var(--ink); }
.nav-links { display: flex; align-items: center; gap: 32px; list-style: none; padding: 0; margin: 0; }
.nav-links a { color: var(--ink-soft); font-size: 0.93rem; font-weight: 500; }
.nav-links a:hover { color: var(--purple); }
.nav-links a.active { color: var(--purple); }
.nav-cta { display: flex; align-items: center; gap: 12px; }
@media (max-width: 768px) { .nav-links { display: none; } }

/* ── Buttons ─────────────────────────────────────────────────────────────── */
.btn-pk {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 22px;
  font-family: var(--font-display); font-size: 0.9rem; font-weight: 600;
  letter-spacing: 0.01em;
  border-radius: 100px; border: 1px solid transparent;
  cursor: pointer; transition: all 0.18s ease; text-decoration: none;
  white-space: nowrap;
}
.btn-primary-pk { background: var(--purple); color: #fff; }
.btn-primary-pk:hover { background: var(--purple-hover); color: #fff; transform: translateY(-1px); box-shadow: 0 8px 24px rgba(90, 74, 183, 0.25); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line-strong); }
.btn-ghost:hover { border-color: var(--ink); color: var(--ink); transform: translateY(-1px); }
.btn-ink { background: var(--ink); color: #fff; }
.btn-ink:hover { background: var(--ink-soft); color: #fff; transform: translateY(-1px); }
.btn-link-pk { background: transparent; color: var(--purple); padding: 11px 0; }
.btn-link-pk:hover { color: var(--purple-hover); gap: 12px; }
.btn-large { padding: 14px 28px; font-size: 0.95rem; }
.btn-small { padding: 8px 14px; font-size: 0.83rem; }

/* ── Layout ──────────────────────────────────────────────────────────────── */
.section { padding: 96px 0; }
.section-tight { padding: 64px 0; }
.section-flush { padding: 120px 0; }
.container-pk { width: 100%; max-width: 1180px; margin: 0 auto; padding: 0 32px; }
.container-narrow { max-width: 880px; margin: 0 auto; padding: 0 32px; }
@media (max-width: 768px) {
  .section { padding: 64px 0; }
  .section-flush { padding: 80px 0; }
  .container-pk, .container-narrow { padding: 0 20px; }
}

/* ── Eyebrow / kicker ────────────────────────────────────────────────────── */
.eyebrow {
  display: inline-block;
  font-size: 0.78rem; font-weight: 600;
  letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--purple); margin-bottom: 16px;
}
.eyebrow-muted { color: var(--muted); }

/* ── Hero (home only) ────────────────────────────────────────────────────── */
.hero { padding: 160px 0 100px; position: relative; overflow: hidden; }
.hero::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse 800px 600px at 80% 0%, var(--purple-soft) 0%, transparent 60%);
  pointer-events: none;
}
.hero-grid { display: grid; grid-template-columns: 1.05fr 1fr; gap: 80px; align-items: center; position: relative; z-index: 1; }
@media (max-width: 900px) { .hero-grid { grid-template-columns: 1fr; gap: 48px; } }
.hero h1 { font-size: clamp(2.5rem, 5.5vw, 4.5rem); font-weight: 800; letter-spacing: -0.045em; margin: 16px 0 24px; }
.hero h1 .accent { color: var(--purple); }
.hero .lead { font-size: 1.15rem; color: var(--ink-soft); line-height: 1.65; margin-bottom: 32px; max-width: 480px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 24px; }
.hero-note { color: var(--muted); font-size: 0.85rem; }
.hero-note .dot { color: var(--line-strong); margin: 0 8px; }
.hero-mockup {
  position: relative; border-radius: var(--radius-lg);
  background: var(--surface); box-shadow: var(--shadow-lg);
  overflow: hidden; border: 1px solid var(--line);
}
.hero-mockup-bg {
  position: absolute; top: -40px; right: -40px; bottom: -40px; left: 60px;
  background: linear-gradient(135deg, var(--purple) 0%, #b69dff 100%);
  border-radius: var(--radius-lg); z-index: -1; opacity: 0.18; filter: blur(40px);
}

/* ── Sub-page header (showcase / pricing / downloads) ────────────────────── */
.page-header { padding: 160px 0 60px; text-align: center; position: relative; overflow: hidden; }
.page-header::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse 800px 400px at 50% 0%, var(--purple-soft) 0%, transparent 60%);
  pointer-events: none;
}
.page-header h1 { font-size: clamp(2.5rem, 5vw, 4rem); margin: 8px 0 20px; position: relative; }
.page-header .lead {
  font-size: 1.2rem; color: var(--ink-soft);
  max-width: 640px; margin: 0 auto 24px; line-height: 1.6; position: relative;
}
.page-header .hero-note { position: relative; }

/* ── Trust strip ─────────────────────────────────────────────────────────── */
.trust-strip { padding: 32px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.trust-list {
  display: flex; flex-wrap: wrap; justify-content: center; align-items: center;
  gap: 48px; list-style: none; padding: 0; margin: 0;
  color: var(--muted); font-size: 0.85rem;
}
.trust-list li { display: flex; align-items: center; gap: 8px; }
.trust-list i { font-size: 1rem; color: var(--ink-soft); }
@media (max-width: 700px) { .trust-list { gap: 24px; } }

/* ── Section heading ─────────────────────────────────────────────────────── */
.section-heading { text-align: center; margin-bottom: 64px; }
.section-heading h2 { font-size: clamp(2rem, 4vw, 2.75rem); margin: 0 0 16px; }
.section-heading p { font-size: 1.1rem; color: var(--muted); max-width: 580px; margin: 0 auto; line-height: 1.6; }

/* ── Feature grid (showcase) ─────────────────────────────────────────────── */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
@media (max-width: 900px) { .feature-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .feature-grid { grid-template-columns: 1fr; } }
.feature-card {
  padding: 32px 28px; background: var(--surface);
  border: 1px solid var(--line); border-radius: var(--radius);
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}
.feature-card:hover { transform: translateY(-3px); border-color: var(--line-strong); box-shadow: var(--shadow-md); }
.feature-card .icon {
  width: 44px; height: 44px; border-radius: 12px;
  background: var(--purple-soft); color: var(--purple);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 1.2rem; margin-bottom: 20px;
}
.feature-card h3 { font-size: 1.15rem; margin: 0 0 10px; }
.feature-card p { color: var(--muted); margin: 0; font-size: 0.95rem; line-height: 1.6; }
.feature-card .pro-tag {
  display: inline-block; margin-left: 8px; padding: 2px 8px;
  background: var(--purple); color: #fff; font-size: 0.65rem; font-weight: 700;
  letter-spacing: 0.08em; text-transform: uppercase; border-radius: 100px;
  vertical-align: middle; position: relative; top: -2px;
}

/* ── Showcase / alternating screenshots ──────────────────────────────────── */
.showcase-row {
  display: grid; grid-template-columns: 1fr 1.15fr; gap: 80px; align-items: center;
  margin-bottom: 120px;
}
.showcase-row:nth-child(even) .showcase-text { order: 2; }
.showcase-row:nth-child(even) .showcase-image { order: 1; }
.showcase-row:last-child { margin-bottom: 0; }
@media (max-width: 900px) {
  .showcase-row { grid-template-columns: 1fr; gap: 32px; margin-bottom: 80px; }
  .showcase-row:nth-child(even) .showcase-text,
  .showcase-row:nth-child(even) .showcase-image { order: unset; }
}
.showcase-text h3 { font-size: clamp(1.6rem, 3vw, 2.2rem); margin: 0 0 20px; }
.showcase-text p { color: var(--ink-soft); font-size: 1.05rem; margin-bottom: 24px; }
.showcase-text ul { list-style: none; padding: 0; margin: 0 0 24px; }
.showcase-text ul li {
  padding: 8px 0; padding-left: 28px; position: relative;
  color: var(--ink-soft); font-size: 0.97rem;
}
.showcase-text ul li::before {
  content: '✓'; position: absolute; left: 0; top: 8px;
  color: var(--purple); font-weight: 700;
}
.showcase-image {
  border-radius: var(--radius-lg); overflow: hidden;
  box-shadow: var(--shadow-md); border: 1px solid var(--line);
  background: var(--surface);
}
.showcase-image svg { display: block; width: 100%; height: auto; }

/* ── Steps ───────────────────────────────────────────────────────────────── */
.steps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 48px; }
@media (max-width: 768px) { .steps-grid { grid-template-columns: 1fr; gap: 40px; } }
.step-card { position: relative; padding-top: 64px; }
.step-card .num {
  position: absolute; top: 0; left: 0;
  font-family: var(--font-display); font-weight: 800; font-size: 3rem;
  color: var(--line-strong); letter-spacing: -0.04em; line-height: 1;
}
.step-card h4 { font-size: 1.15rem; margin: 0 0 10px; }
.step-card p { color: var(--muted); margin: 0; font-size: 0.95rem; }

/* ── Pricing — 4-card grid ───────────────────────────────────────────────── */
.pricing-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
  max-width: 1180px; margin: 0 auto;
}
@media (max-width: 1100px) { .pricing-grid { grid-template-columns: repeat(2, 1fr); max-width: 720px; gap: 24px; } }
@media (max-width: 640px)  { .pricing-grid { grid-template-columns: 1fr; max-width: 480px; } }

.price-card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 32px 22px;
  position: relative; transition: transform 0.2s, box-shadow 0.2s;
  display: flex; flex-direction: column;
}
.price-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.price-card.featured {
  border-color: var(--purple);
  background: linear-gradient(180deg, #ffffff 0%, #f9f7ff 100%);
  box-shadow: 0 16px 48px rgba(90, 74, 183, 0.12);
}
.price-card .badge {
  position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
  background: var(--purple); color: #fff;
  font-size: 0.7rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase;
  padding: 5px 14px; border-radius: 100px; white-space: nowrap;
}
.price-card .plan-name {
  font-family: var(--font-display); font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.14em;
  font-size: 0.78rem; color: var(--muted); margin-bottom: 24px;
}
.price-card .plan-price { display: flex; align-items: baseline; gap: 8px; margin-bottom: 8px; }
.price-card .plan-price .amount {
  font-family: var(--font-display); font-weight: 800; font-size: 2.4rem;
  color: var(--ink); letter-spacing: -0.04em; line-height: 1;
}
.price-card .plan-price .amount.txt { font-size: 1.5rem; }
.price-card .plan-price .period { color: var(--muted); font-size: 0.85rem; }
.price-card .plan-tagline {
  color: var(--muted); font-size: 0.88rem; margin-bottom: 22px;
  min-height: 2.4em; line-height: 1.5;
}
.price-card ul.features {
  list-style: none; padding: 0; margin: 0 0 24px;
  flex-grow: 1;
}
.price-card ul.features li {
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.86rem; color: var(--ink-soft);
  display: flex; align-items: flex-start; gap: 9px;
  line-height: 1.45;
}
.price-card ul.features li:last-child { border-bottom: none; }
.price-card ul.features li i.check { color: var(--teal); margin-top: 3px; font-size: 0.85rem; }
.price-card ul.features li i.lock { color: var(--line-strong); margin-top: 3px; font-size: 0.85rem; }
.price-card ul.features li.dim { color: var(--muted); }
.price-card .btn-pk { width: 100%; justify-content: center; }

/* ── Comparison table ────────────────────────────────────────────────────── */
.compare-table {
  width: 100%; max-width: 920px; margin: 64px auto 0;
  border-collapse: separate; border-spacing: 0;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden;
}
.compare-table th, .compare-table td {
  padding: 16px 20px; text-align: left; border-bottom: 1px solid var(--line);
  font-size: 0.93rem;
}
.compare-table thead th {
  background: #f6f5f1; font-family: var(--font-display); font-size: 0.78rem;
  font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted);
}
.compare-table thead th:nth-child(3) { color: var(--purple); }
.compare-table tbody tr:last-child td { border-bottom: none; }
.compare-table td.cell-yes { color: var(--teal); }
.compare-table td.cell-no { color: var(--line-strong); }
.compare-table td.feature { color: var(--ink); font-weight: 500; }

/* ── FAQ ─────────────────────────────────────────────────────────────────── */
.faq-list { max-width: 760px; margin: 0 auto; }
.faq-item {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px 28px; margin-bottom: 12px;
}
.faq-item summary {
  list-style: none; cursor: pointer; display: flex; justify-content: space-between; align-items: center;
  font-family: var(--font-display); font-weight: 600; font-size: 1.02rem; color: var(--ink);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+'; font-size: 1.5rem; color: var(--muted); transition: transform 0.2s; line-height: 1;
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item .answer { margin-top: 14px; color: var(--ink-soft); font-size: 0.97rem; line-height: 1.65; }

/* ── Downloads — platform cards ──────────────────────────────────────────── */
.download-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
  max-width: 1120px; margin: 0 auto;
}
@media (max-width: 900px) { .download-grid { grid-template-columns: 1fr; max-width: 480px; } }

.download-card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 36px 32px; text-align: center;
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
  display: flex; flex-direction: column;
}
.download-card:hover {
  transform: translateY(-4px); box-shadow: var(--shadow-md);
  border-color: var(--line-strong);
}
.download-card .platform-icon {
  width: 64px; height: 64px; margin: 0 auto 20px;
  border-radius: 16px;
  background: var(--purple-soft); color: var(--purple);
  display: flex; align-items: center; justify-content: center;
  font-size: 2rem;
}
.download-card h3 {
  font-family: var(--font-display); font-size: 1.3rem;
  margin: 0 0 6px; color: var(--ink);
}
.download-card .download-sub { color: var(--muted); font-size: 0.9rem; margin-bottom: 24px; }
.download-card .download-meta {
  font-family: var(--font-mono); font-size: 0.82rem; color: var(--muted);
  background: var(--bg); padding: 10px 14px; border-radius: 8px;
  border: 1px solid var(--line);
  margin-bottom: 24px; flex-grow: 1;
  display: flex; align-items: center; justify-content: center;
}
.download-card .btn-pk { width: 100%; justify-content: center; }

.build-info {
  max-width: 760px; margin: 64px auto 0;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 28px 32px;
}
.build-info .info-title {
  font-family: var(--font-display); font-weight: 700;
  font-size: 1.05rem; margin: 0 0 12px;
  display: flex; align-items: center; gap: 10px;
}
.build-info .info-title i { color: var(--purple); }
.build-info p { color: var(--ink-soft); margin: 0 0 14px; font-size: 0.95rem; line-height: 1.6; }
.build-info p:last-child { margin-bottom: 0; }
.build-info code {
  font-family: var(--font-mono); font-size: 0.88em;
  background: var(--bg); padding: 1px 7px; border-radius: 4px;
  color: var(--purple);
}

/* ── CTA banner ──────────────────────────────────────────────────────────── */
.cta-banner {
  background: var(--ink); color: #fff;
  border-radius: var(--radius-lg);
  padding: 72px 48px; text-align: center;
  position: relative; overflow: hidden;
}
.cta-banner::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse 600px 400px at 50% 0%, rgba(90, 74, 183, 0.35) 0%, transparent 70%);
  pointer-events: none;
}
.cta-banner h2 { color: #fff; font-size: clamp(1.8rem, 3.5vw, 2.5rem); margin: 0 0 12px; position: relative; }
.cta-banner p { color: rgba(255, 255, 255, 0.65); margin: 0 0 32px; font-size: 1.05rem; position: relative; }
.cta-banner .btn-cta-group { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; position: relative; }
.cta-banner .btn-primary-pk { background: #fff; color: var(--ink); }
.cta-banner .btn-primary-pk:hover { background: rgba(255, 255, 255, 0.9); color: var(--ink); }
.cta-banner .btn-ghost { color: #fff; border-color: rgba(255, 255, 255, 0.25); }
.cta-banner .btn-ghost:hover { border-color: #fff; color: #fff; }

/* ── Contact ─────────────────────────────────────────────────────────────── */
.contact-grid { display: grid; grid-template-columns: 0.85fr 1fr; gap: 64px; align-items: flex-start; }
@media (max-width: 768px) { .contact-grid { grid-template-columns: 1fr; gap: 40px; } }
.contact-info h3 { font-size: 1.5rem; margin: 0 0 16px; }
.contact-info p { color: var(--ink-soft); margin: 0 0 24px; }
.contact-info .info-row { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; color: var(--ink-soft); font-size: 0.95rem; }
.contact-info .info-row i { color: var(--purple); width: 20px; text-align: center; }
.contact-form { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 32px; }
.contact-form label {
  display: block; font-size: 0.8rem; font-weight: 600;
  letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted);
  margin-bottom: 8px;
}
.contact-form input, .contact-form select, .contact-form textarea {
  width: 100%; padding: 12px 14px; font-family: inherit; font-size: 0.95rem;
  border: 1px solid var(--line); border-radius: 10px; background: var(--bg);
  color: var(--ink); transition: border-color 0.15s, box-shadow 0.15s;
}
.contact-form input:focus, .contact-form select:focus, .contact-form textarea:focus {
  outline: none; border-color: var(--purple); box-shadow: 0 0 0 3px var(--purple-soft);
}
.contact-form .field { margin-bottom: 20px; }
.contact-form textarea { resize: vertical; min-height: 120px; }
.contact-form button[type="submit"] { width: 100%; justify-content: center; }

/* ── Footer ──────────────────────────────────────────────────────────────── */
.footer { border-top: 1px solid var(--line); padding: 48px 0 32px; background: var(--bg); }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 40px; }
@media (max-width: 768px) { .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; } }
.footer-brand { font-family: var(--font-display); font-weight: 800; font-size: 1.4rem; letter-spacing: -0.04em; margin-bottom: 8px; }
.footer-brand .delta { color: var(--purple); }
.footer-tagline { color: var(--muted); font-size: 0.9rem; margin-bottom: 16px; max-width: 280px; }
.footer-col h5 { font-size: 0.78rem; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); margin: 0 0 16px; }
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { color: var(--ink-soft); font-size: 0.93rem; }
.footer-col ul li a:hover { color: var(--purple); }
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 24px; border-top: 1px solid var(--line);
  color: var(--muted); font-size: 0.85rem;
}
.footer-bottom a { color: var(--muted); margin-left: 20px; }
.footer-bottom a:hover { color: var(--purple); }
@media (max-width: 600px) { .footer-bottom { flex-direction: column; gap: 10px; text-align: center; } }

/* ── Subtle stagger animation on load ────────────────────────────────────── */
.fade-up { opacity: 0; transform: translateY(16px); animation: fadeUp 0.7s cubic-bezier(0.2, 0.7, 0.2, 1) forwards; }
.fade-up-1 { animation-delay: 0.05s; }
.fade-up-2 { animation-delay: 0.15s; }
.fade-up-3 { animation-delay: 0.25s; }
.fade-up-4 { animation-delay: 0.35s; }
@keyframes fadeUp { to { opacity: 1; transform: translateY(0); } }