/* ===================================================================
   TenbaMail — marketing site styles
   Brand colors & fonts live in :root — tweak once, applies everywhere.
   =================================================================== */

:root {
  --accent:        #4f46e5;   /* indigo */
  --accent-dark:   #4338ca;
  --accent-soft:   #c7d2fe;
  --ink:           #0f172a;   /* near-black text */
  --ink-soft:      #475569;   /* secondary text */
  --surface:       #f1f5f9;   /* light section bg */
  --surface-2:     #e2e8f0;
  --border:        #e2e8f0;
  --bg:            #ffffff;
  --radius:        14px;
  --shadow:        0 10px 30px -12px rgb(15 23 42 / .15);
  --font: "Segoe UI", system-ui, -apple-system, Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

.container {
  width: min(1140px, 100% - 2.5rem);
  margin-inline: auto;
}

/* ---------- typography ---------- */
h1 { font-size: clamp(2rem, 4.2vw, 3.2rem); line-height: 1.15; letter-spacing: -0.02em; }
h2 { font-size: clamp(1.6rem, 3vw, 2.3rem); line-height: 1.2; letter-spacing: -0.01em; }
h3 { font-size: 1.15rem; }

.eyebrow {
  display: inline-block;
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: .75rem;
}

.accent { color: var(--accent); }

.lead { font-size: 1.15rem; color: var(--ink-soft); }

/* ---------- buttons ---------- */
.btn {
  display: inline-block;
  padding: .65rem 1.4rem;
  border-radius: 10px;
  font-weight: 600;
  font-size: .95rem;
  text-decoration: none;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease, color .15s ease;
  border: 2px solid transparent;
  cursor: pointer;
}
.btn:hover { transform: translateY(-2px); }
.btn-lg { padding: .85rem 1.9rem; font-size: 1.05rem; }

.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 6px 18px -6px rgb(79 70 229 / .5); }
.btn-primary:hover { background: var(--accent-dark); }

.btn-outline { border-color: var(--accent); color: var(--accent); background: transparent; }
.btn-outline:hover { background: var(--accent); color: #fff; }

.btn-ghost { color: var(--ink); background: transparent; }
.btn-ghost:hover { color: var(--accent); }

.btn-light { background: #fff; color: var(--accent); }
.btn-outline-light { border-color: rgb(255 255 255 / .7); color: #fff; }
.btn-outline-light:hover { background: rgb(255 255 255 / .12); }

/* ===================================================================
   Header
   =================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgb(255 255 255 / .92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding-block: .8rem;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  text-decoration: none;
  color: var(--ink);
}
.logo-mark { width: 30px; height: 30px; flex-shrink: 0; }
.logo-text { font-size: 1.25rem; font-weight: 400; letter-spacing: -.01em; }
.logo-text strong { font-weight: 800; color: var(--accent); }
.logo-text-light { color: #fff; }
.logo-text-light strong { color: var(--accent-soft); }

.main-nav {
  display: flex;
  align-items: center;
  gap: 1.4rem;
}
.main-nav > a {
  text-decoration: none;
  color: var(--ink-soft);
  font-weight: 500;
  font-size: .95rem;
  transition: color .15s ease;
}
.main-nav > a:hover { color: var(--accent); }

.nav-auth { display: flex; align-items: center; gap: .5rem; margin-left: .5rem; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  padding: .4rem;
  cursor: pointer;
}
.nav-toggle span {
  width: 24px; height: 2.5px;
  background: var(--ink);
  border-radius: 2px;
  transition: transform .2s ease, opacity .2s ease;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

/* ===================================================================
   Hero
   =================================================================== */
.hero {
  padding-block: clamp(3rem, 7vw, 6rem);
  background:
    radial-gradient(60% 80% at 85% 10%, rgb(79 70 229 / .08), transparent 60%),
    radial-gradient(50% 70% at 5% 90%, rgb(79 70 229 / .06), transparent 60%);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 3rem;
  align-items: center;
}

.hero-copy .lead { margin-top: 1.1rem; max-width: 34rem; }

.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 1.8rem; }

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 2.2rem;
  list-style: none;
  margin-top: 2.4rem;
}
.hero-stats li { display: flex; flex-direction: column; }
.hero-stats strong { font-size: 1.5rem; color: var(--ink); }
.hero-stats span { font-size: .85rem; color: var(--ink-soft); }

.hero-visual svg { width: 100%; height: auto; filter: drop-shadow(0 20px 35px rgb(15 23 42 / .12)); }

.float { animation: float 4s ease-in-out infinite; }
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-10px); }
}

/* ===================================================================
   Sections
   =================================================================== */
.section { padding-block: clamp(3.5rem, 6vw, 5.5rem); }
.section-alt { background: var(--surface); }

.section-head {
  max-width: 42rem;
  margin-inline: auto;
  text-align: center;
  margin-bottom: 3rem;
}
.section-head p { margin-top: .8rem; color: var(--ink-soft); }

/* ---------- features ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.4rem;
}

.feature-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.8rem 1.5rem;
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  border-color: var(--accent-soft);
}
.feature-card h3 { margin-block: 1rem .5rem; }
.feature-card p { font-size: .93rem; color: var(--ink-soft); }

.feature-icon {
  width: 52px; height: 52px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: rgb(79 70 229 / .1);
  color: var(--accent);
}
.feature-icon svg { width: 26px; height: 26px; }

/* ---------- steps ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1.2rem;
  list-style: none;
  counter-reset: step;
}

.step {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.6rem 1.3rem;
  position: relative;
}
.step h3 { font-size: 1rem; margin-block: .9rem .4rem; }
.step p { font-size: .88rem; color: var(--ink-soft); }

.step-num {
  display: grid;
  place-items: center;
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  font-size: 1.05rem;
}

/* ---------- integrations / api ---------- */
.integration-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: .8rem;
  margin-bottom: 2.5rem;
}

.badge-chip {
  padding: .55rem 1.2rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  font-weight: 600;
  font-size: .9rem;
  color: var(--ink-soft);
}

.code-sample {
  max-width: 620px;
  margin-inline: auto;
  background: #0f172a;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow-x: auto;
}
.code-sample pre {
  padding: 1.6rem 1.8rem;
  font-family: "Cascadia Code", Consolas, "Courier New", monospace;
  font-size: .88rem;
  line-height: 1.7;
  color: #e2e8f0;
}
.code-sample .c { color: #64748b; }
.code-sample .k { color: #818cf8; font-weight: 700; }
.code-sample .s { color: #6ee7b7; }

/* ---------- services grid ---------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.2rem;
}

.service {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem 1.3rem;
  transition: border-color .2s ease, box-shadow .2s ease;
}
.service:hover { border-color: var(--accent-soft); box-shadow: var(--shadow); }
.service h3 { font-size: 1rem; color: var(--accent-dark); }
.service p { font-size: .88rem; color: var(--ink-soft); margin-top: .35rem; }

/* ---------- FAQ ---------- */
.faq-inner { max-width: 760px; }

.faq-item {
  border: 1px solid var(--border);
  border-radius: 12px;
  margin-bottom: .8rem;
  background: var(--bg);
  overflow: hidden;
}
.faq-item summary {
  padding: 1.1rem 1.3rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 3rem;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 1.3rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.4rem;
  color: var(--accent);
  transition: transform .2s ease;
}
.faq-item[open] summary::after { transform: translateY(-50%) rotate(45deg); }
.faq-item p { padding: 0 1.3rem 1.2rem; color: var(--ink-soft); font-size: .95rem; }

/* ---------- CTA banner ---------- */
.cta-banner {
  background: linear-gradient(135deg, var(--accent) 0%, #7c3aed 100%);
  color: #fff;
  padding-block: clamp(3rem, 6vw, 4.5rem);
  text-align: center;
}
.cta-inner p { margin-top: .6rem; opacity: .9; font-size: 1.1rem; }
.cta-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: .9rem; margin-top: 1.8rem; }

/* ===================================================================
   Footer
   =================================================================== */
.site-footer {
  background: var(--ink);
  color: #cbd5e1;
  padding-top: 3.5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2.5rem;
  padding-bottom: 2.5rem;
}

.footer-brand p { margin-top: 1rem; font-size: .92rem; max-width: 20rem; color: #94a3b8; }

.socials { display: flex; gap: .9rem; margin-top: 1.2rem; }
.socials a { color: #94a3b8; transition: color .15s ease; }
.socials a:hover { color: #fff; }
.socials svg { width: 20px; height: 20px; }

.footer-col h4 {
  color: #fff;
  font-size: .9rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  margin-bottom: 1rem;
}
.footer-col a {
  display: block;
  color: #94a3b8;
  text-decoration: none;
  font-size: .92rem;
  margin-bottom: .55rem;
  transition: color .15s ease;
}
.footer-col a:hover { color: #fff; }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: .5rem;
  padding-block: 1.4rem;
  border-top: 1px solid rgb(255 255 255 / .1);
  font-size: .82rem;
  color: #64748b;
}

/* ===================================================================
   Reveal-on-scroll animation
   =================================================================== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .6s ease, transform .6s ease;
}
.reveal.visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .float { animation: none; }
}

/* ===================================================================
   Responsive
   =================================================================== */
@media (max-width: 980px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { max-width: 560px; margin-inline: auto; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 760px) {
  .main-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: #fff;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
    padding: .6rem 1.25rem 1rem;
    display: none;
  }
  .main-nav.open { display: flex; }
  .main-nav > a { padding: .7rem 0; border-bottom: 1px solid var(--surface); }
  .nav-auth { margin: .9rem 0 0; }
  .nav-toggle { display: flex; }
}

@media (max-width: 560px) {
  .feature-grid,
  .steps,
  .services-grid,
  .footer-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 1.4rem; }
}