/* DiveScan marketing site — hand-written CSS, no framework */

:root {
  --ocean-900: #062a3f;
  --ocean-800: #0a3a56;
  --ocean-700: #0f4c6e;
  --ocean-600: #156088;
  --teal-500: #14b8c4;
  --teal-400: #3fd2dc;
  --sand-50: #f8f5ec;
  --sand-100: #f0ead9;
  --ink-900: #0b1f2a;
  --ink-600: #3c5566;
  --white: #ffffff;
  --danger: #c94b3f;

  --bg: var(--sand-50);
  --surface: var(--white);
  --text: var(--ink-900);
  --text-muted: var(--ink-600);
  --border: rgba(11, 31, 42, 0.1);
  --accent: var(--teal-500);
  --hero-from: var(--ocean-900);
  --hero-to: var(--ocean-700);

  --max-width: 1120px;
  --radius: 16px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #071a24;
    --surface: #0d2531;
    --text: #eef5f7;
    --text-muted: #a9c0c9;
    --border: rgba(238, 245, 247, 0.12);
    --hero-from: #041420;
    --hero-to: #0a3346;
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  * {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--teal-500);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--surface);
  color: var(--text);
  padding: 12px 20px;
  border-radius: 0 0 8px 0;
  z-index: 100;
}

.skip-link:focus {
  left: 0;
}

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
}

.brand:hover {
  text-decoration: none;
}

.brand__mark {
  width: 30px;
  height: 30px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.main-nav a:not(.button) {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.95rem;
}

.main-nav a:not(.button):hover {
  color: var(--text);
}

.nav-toggle {
  display: none;
}

/* ---------- Buttons ---------- */

.button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.button:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.button--primary {
  background: var(--teal-500);
  color: #04262b;
  box-shadow: 0 8px 20px -8px rgba(20, 184, 196, 0.7);
}

.button--primary:hover {
  background: var(--teal-400);
}

.button--ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}

.button--on-dark {
  background: rgba(255, 255, 255, 0.08);
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.25);
}

.button--on-dark:hover {
  background: rgba(255, 255, 255, 0.16);
}

/* ---------- Hero ---------- */

.hero {
  position: relative;
  background: linear-gradient(160deg, var(--hero-from), var(--hero-to) 70%);
  color: var(--white);
  overflow: hidden;
  padding-top: 64px;
}

.hero .container {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  align-items: center;
  padding-bottom: 96px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--teal-400);
  background: rgba(20, 184, 196, 0.12);
  border: 1px solid rgba(63, 210, 220, 0.35);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 20px;
}

.eyebrow__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--teal-400);
}

.hero h1 {
  font-size: clamp(2.2rem, 4.2vw, 3.4rem);
  line-height: 1.1;
  margin: 0 0 20px;
  letter-spacing: -0.01em;
}

.hero h1 em {
  font-style: normal;
  color: var(--teal-400);
}

.hero p.lede {
  font-size: 1.15rem;
  color: rgba(238, 245, 247, 0.85);
  max-width: 46ch;
  margin: 0 0 32px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 28px;
}

.hero-note {
  font-size: 0.85rem;
  color: rgba(238, 245, 247, 0.6);
}

.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
}

.bubbles {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  overflow: hidden;
}

.bubble {
  position: absolute;
  bottom: -60px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.55), rgba(255, 255, 255, 0.05));
  animation: rise 14s infinite ease-in;
}

@keyframes rise {
  0% {
    transform: translateY(0) scale(1);
    opacity: 0;
  }
  10% {
    opacity: 0.8;
  }
  100% {
    transform: translateY(-620px) scale(1.1);
    opacity: 0;
  }
}

.wave-divider {
  display: block;
  width: 100%;
  line-height: 0;
  margin-top: -2px;
}

.wave-divider svg {
  width: 100%;
  height: auto;
}

/* ---------- Phone mock ---------- */

.phone-mock {
  position: relative;
  z-index: 2;
  width: 260px;
  background: var(--ink-900);
  border-radius: 36px;
  padding: 14px;
  box-shadow: 0 30px 60px -20px rgba(0, 0, 0, 0.55), 0 0 0 1px rgba(255, 255, 255, 0.08);
}

.phone-mock__notch {
  width: 90px;
  height: 18px;
  background: var(--ink-900);
  border-radius: 0 0 14px 14px;
  margin: 0 auto 6px;
}

.phone-mock__screen {
  background: var(--sand-50);
  border-radius: 22px;
  padding: 18px 16px 20px;
  color: var(--ink-900);
}

.phone-mock__header {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-600);
  margin-bottom: 12px;
}

.phone-mock .field {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  padding: 9px 0;
  border-bottom: 1px solid rgba(11, 31, 42, 0.08);
  font-size: 0.85rem;
}

.phone-mock .field span {
  color: var(--ink-600);
}

.phone-mock .field strong {
  font-weight: 600;
  text-align: right;
}

.phone-mock .field.flagged strong {
  color: #b4790a;
  position: relative;
}

.phone-mock .field.flagged strong::after {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #e2a12e;
  margin-left: 6px;
  vertical-align: middle;
}

.phone-mock__save {
  width: 100%;
  margin-top: 16px;
  padding: 10px;
  border: none;
  border-radius: 12px;
  background: var(--teal-500);
  color: #04262b;
  font-weight: 700;
  font-size: 0.9rem;
}

/* ---------- Sections ---------- */

section {
  padding: 88px 0;
}

.section-head {
  max-width: 640px;
  margin: 0 auto 56px;
  text-align: center;
}

.section-head .eyebrow {
  color: var(--ocean-700);
  background: rgba(20, 184, 196, 0.1);
  border-color: rgba(20, 184, 196, 0.25);
}

@media (prefers-color-scheme: dark) {
  .section-head .eyebrow {
    color: var(--teal-400);
  }
}

.section-head h2 {
  font-size: clamp(1.7rem, 3vw, 2.3rem);
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}

.section-head p {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin: 0;
}

/* ---------- How it works ---------- */

.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  counter-reset: step;
}

.step {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 22px;
}

.step::before {
  counter-increment: step;
  content: counter(step);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--teal-500);
  color: #04262b;
  font-weight: 800;
  margin-bottom: 16px;
}

.step h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
}

.step p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.94rem;
}

/* ---------- Features ---------- */

.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
}

.feature-card__icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: rgba(20, 184, 196, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.feature-card__icon svg {
  width: 22px;
  height: 22px;
  stroke: var(--teal-500);
}

.feature-card h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
}

.feature-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.94rem;
}

/* ---------- Pricing ---------- */

.pricing-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 24px;
  align-items: stretch;
}

.price-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 26px;
  display: flex;
  flex-direction: column;
}

.price-card--highlight {
  border-color: var(--teal-500);
  box-shadow: 0 20px 40px -24px rgba(20, 184, 196, 0.5);
  position: relative;
}

.price-card__badge {
  position: absolute;
  top: -13px;
  left: 26px;
  background: var(--teal-500);
  color: #04262b;
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 5px 12px;
  border-radius: 999px;
}

.price-card h3 {
  margin: 0 0 6px;
  font-size: 1.1rem;
}

.price-card .price {
  font-size: 2.1rem;
  font-weight: 800;
  margin: 6px 0 14px;
}

.price-card .price span {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-muted);
}

.price-card ul {
  list-style: none;
  padding: 0;
  margin: 0 0 20px;
  flex: 1;
}

.price-card li {
  padding: 6px 0;
  color: var(--text-muted);
  font-size: 0.92rem;
  display: flex;
  gap: 8px;
}

.price-card li::before {
  content: "✓";
  color: var(--teal-500);
  font-weight: 700;
}

.pricing-footnote {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 32px;
}

/* ---------- CTA banner ---------- */

.cta-banner {
  background: linear-gradient(160deg, var(--hero-from), var(--hero-to) 80%);
  color: var(--white);
  border-radius: 28px;
  padding: 56px 40px;
  text-align: center;
  margin: 0 24px;
}

.cta-banner h2 {
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  margin: 0 0 12px;
}

.cta-banner p {
  color: rgba(238, 245, 247, 0.8);
  max-width: 52ch;
  margin: 0 auto 28px;
}

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 48px 0 32px;
  margin-top: 40px;
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
  margin-bottom: 28px;
}

.footer-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.92rem;
}

.footer-fine {
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ---------- Legal / simple content pages ---------- */

.content-page {
  padding: 56px 0 96px;
}

.content-page .container {
  max-width: 760px;
}

.content-page h1 {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  margin: 0 0 6px;
}

.content-page .updated {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 40px;
}

.content-page h2 {
  font-size: 1.3rem;
  margin: 40px 0 12px;
}

.content-page h3 {
  font-size: 1.05rem;
  margin: 24px 0 8px;
}

.content-page p,
.content-page li {
  color: var(--text-muted);
  font-size: 0.98rem;
}

.content-page ul,
.content-page ol {
  padding-left: 22px;
}

.content-page address {
  font-style: normal;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 20px;
  display: inline-block;
  margin: 8px 0 24px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 24px;
  font-size: 0.92rem;
  font-weight: 600;
}

/* ---------- Responsive ---------- */

@media (max-width: 900px) {
  .hero .container {
    grid-template-columns: 1fr;
    padding-bottom: 64px;
  }

  .hero-visual {
    order: -1;
  }

  .phone-mock {
    width: 220px;
  }

  .steps,
  .features,
  .pricing-wrap {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 720px) {
  .main-nav {
    position: fixed;
    inset: 68px 0 0 0;
    background: var(--bg);
    flex-direction: column;
    align-items: flex-start;
    padding: 24px;
    gap: 18px;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s ease, transform 0.15s ease;
  }

  .main-nav.is-open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text);
  }

  .steps,
  .features,
  .pricing-wrap {
    grid-template-columns: 1fr;
  }

  .cta-banner {
    margin: 0 16px;
    padding: 40px 24px;
  }

  section {
    padding: 64px 0;
  }
}