/* ---------------------------------------------------------------
   Design tokens
   Subject: SMS reaching basic phones. Signal bars, message bubbles,
   and monospace numerics carry that through the whole page.
------------------------------------------------------------------ */
:root {
  --navy: #12213A;
  --navy-soft: #1B3050;
  --parchment: #F7F5EF;
  --ink: #16202C;
  --ink-soft: #4B5768;
  --signal-green: #3DDC84;
  --ochre: #E8A33D;
  --teal: #1F6F78;
  --line: rgba(22, 32, 44, 0.12);
  --line-dark: rgba(247, 245, 239, 0.14);

  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'IBM Plex Sans', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--parchment);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.55;
}

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

h1, h2, h3, .wordmark {
  font-family: var(--font-display);
  letter-spacing: -0.01em;
  margin: 0;
}

a { color: inherit; }

/* ---------------------------------------------------------------
   Topbar
------------------------------------------------------------------ */
.topbar {
  background: var(--navy);
  color: var(--parchment);
}
.topbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  padding-bottom: 16px;
}
.wordmark { font-size: 1.15rem; font-weight: 700; }
.wordmark__dot { color: var(--signal-green); }

.signal-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: rgba(247,245,239,0.75);
}

.bars { display: inline-flex; align-items: flex-end; gap: 2px; height: 12px; }
.bars i {
  display: block;
  width: 3px;
  background: rgba(247,245,239,0.35);
  border-radius: 1px;
}
.bars i:nth-child(1) { height: 4px; }
.bars i:nth-child(2) { height: 7px; }
.bars i:nth-child(3) { height: 10px; }
.bars i:nth-child(4) { height: 13px; }
.bars.is-live i { background: var(--signal-green); }
.bars--lg i { width: 4px; }
.bars--lg i:nth-child(1) { height: 6px; }
.bars--lg i:nth-child(2) { height: 10px; }
.bars--lg i:nth-child(3) { height: 14px; }
.bars--lg i:nth-child(4) { height: 18px; }

/* ---------------------------------------------------------------
   Hero
------------------------------------------------------------------ */
.hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
  padding: 72px 24px 64px;
}
.eyebrow {
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.75rem;
  color: var(--teal);
  margin: 0 0 14px;
}
.hero h1 {
  font-size: clamp(2rem, 4vw, 2.9rem);
  line-height: 1.1;
  margin-bottom: 20px;
}
.hero__sub {
  color: var(--ink-soft);
  font-size: 1.05rem;
  max-width: 46ch;
  margin: 0 0 28px;
}
.hero__cta { display: flex; gap: 12px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 13px 22px;
  border-radius: 8px;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn--primary {
  background: var(--navy);
  color: var(--parchment);
}
.btn--primary:hover { box-shadow: 0 6px 18px rgba(18,33,58,0.25); }
.btn--ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--ink);
}
.btn--sm { padding: 10px 16px; font-size: 0.85rem; }

/* Phone mockup - the signature element */
.hero__phone { display: flex; justify-content: center; }
.phone {
  width: 280px;
  background: var(--navy);
  border-radius: 22px;
  padding: 18px 16px 22px;
  box-shadow: 0 24px 48px rgba(18,33,58,0.28);
  color: var(--parchment);
}
.phone__signal {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 14px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--line-dark);
}
.phone__carrier { font-family: var(--font-mono); font-size: 0.7rem; color: rgba(247,245,239,0.6); }
.phone__thread { display: flex; flex-direction: column; gap: 8px; }
.bubble {
  background: var(--navy-soft);
  border-left: 3px solid var(--signal-green);
  border-radius: 4px 12px 12px 12px;
  padding: 14px;
  font-size: 0.85rem;
  line-height: 1.5;
}
.bubble__meta {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--signal-green);
  padding-left: 4px;
}

/* ---------------------------------------------------------------
   Sections shared
------------------------------------------------------------------ */
.section-title {
  font-size: 1.5rem;
  margin-bottom: 6px;
}
.section-sub {
  color: var(--ink-soft);
  margin: 0 0 24px;
  font-size: 0.95rem;
}

.how { padding: 56px 24px; }
.steps {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.step {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 22px;
  background: #fff;
}
.step__n {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--navy);
  color: var(--signal-green);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  margin-bottom: 12px;
}
.step h3 { font-size: 1.05rem; margin-bottom: 6px; }
.step p { color: var(--ink-soft); font-size: 0.9rem; margin: 0; }

.panel {
  padding: 48px 24px;
  border-top: 1px solid var(--line);
}
.panel--send { background: var(--navy); color: var(--parchment); }
.panel--send .section-title,
.panel--send .send-label { color: var(--parchment); }
.panel--send .section-sub { color: rgba(247,245,239,0.65); }

/* ---------------------------------------------------------------
   Contacts
------------------------------------------------------------------ */
.row-form {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.row-form input, .row-form select, .tip-select, textarea {
  font-family: var(--font-body);
  font-size: 0.9rem;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
}
.row-form input { flex: 1; min-width: 160px; }

.contact-list { display: flex; flex-direction: column; gap: 8px; }
.contact-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  font-size: 0.9rem;
}
.contact-row__phone { font-family: var(--font-mono); color: var(--ink-soft); }
.contact-row__cat {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--teal);
  background: rgba(31,111,120,0.1);
  padding: 3px 8px;
  border-radius: 4px;
}
.icon-btn {
  background: none;
  border: none;
  color: var(--ink-soft);
  cursor: pointer;
  font-size: 1rem;
}
.icon-btn:hover { color: #C0392B; }
.empty-note { color: var(--ink-soft); font-size: 0.9rem; font-style: italic; }

/* ---------------------------------------------------------------
   Tip library
------------------------------------------------------------------ */
.tip-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px;
}
.tip-card {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 16px;
  background: #fff;
}
.tip-card__cat {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ochre);
  margin-bottom: 8px;
  display: block;
}
.tip-card p { margin: 0; font-size: 0.88rem; }

/* ---------------------------------------------------------------
   Send panel
------------------------------------------------------------------ */
.send-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 32px;
}
.send-label { font-size: 0.95rem; margin-bottom: 10px; }
.picker {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 260px;
  overflow-y: auto;
}
.picker label {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--navy-soft);
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 0.88rem;
  cursor: pointer;
}
.picker span.p-phone { font-family: var(--font-mono); color: rgba(247,245,239,0.6); font-size: 0.78rem; }

.tip-select { width: 100%; margin-bottom: 10px; }
textarea { width: 100%; resize: vertical; margin-bottom: 12px; }

.send-result {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
}
.send-result.ok { color: var(--signal-green); }
.send-result.err { color: #E8615A; }

/* ---------------------------------------------------------------
   Footer
------------------------------------------------------------------ */
.footer {
  background: var(--navy);
  color: rgba(247,245,239,0.6);
  padding: 28px 24px;
  font-size: 0.82rem;
}

/* ---------------------------------------------------------------
   Responsive
------------------------------------------------------------------ */
@media (max-width: 780px) {
  .hero { grid-template-columns: 1fr; padding-top: 48px; }
  .hero__phone { order: -1; }
  .steps { grid-template-columns: 1fr; }
  .send-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; }
}