/* Sapphire Echo — Data Science Nest */
:root {
  --sapphire: #0d2470;
  --sapphire-mid: #1a3a8f;
  --sapphire-soft: #2a4fb0;
  --cyan: #5ec8d8;
  --cyan-bright: #7dd3e1;
  --cyan-glass: rgba(94, 200, 216, 0.28);
  --white-hl: #f0f7ff;
  --indigo: #1a1540;
  --indigo-mid: #2a2460;
  --ink: #12102a;
  --ink-soft: #3a3560;
  --muted: #5c5780;
  --surface: rgba(240, 247, 255, 0.72);
  --surface-deep: rgba(26, 21, 64, 0.06);
  --line: rgba(13, 36, 112, 0.14);
  --font-display: "Noto Serif Thai", "Georgia", serif;
  --font-body: "Sarabun", "Segoe UI", sans-serif;
  --space: clamp(1rem, 2.2vw, 1.85rem);
  --max: 70rem;
  --header-h: 4.15rem;
  --ease-crystal: cubic-bezier(0.22, 1, 0.36, 1);
  --radius: 0.35rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 1.05rem;
  line-height: 1.7;
  letter-spacing: 0.01em;
  color: var(--ink);
  background:
    radial-gradient(ellipse 50% 40% at 8% 0%, rgba(94, 200, 216, 0.22), transparent 55%),
    radial-gradient(ellipse 45% 35% at 92% 12%, rgba(42, 79, 176, 0.18), transparent 50%),
    radial-gradient(ellipse 55% 45% at 50% 100%, rgba(26, 21, 64, 0.12), transparent 55%),
    linear-gradient(165deg, #e8f0fb 0%, #d5e2f5 40%, #c4d0ec 100%);
  background-attachment: fixed;
}

body::before {
  content: "";
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 0;
  opacity: 0.45;
  background:
    repeating-linear-gradient(
      118deg,
      transparent 0,
      transparent 18px,
      rgba(125, 211, 225, 0.04) 18px,
      rgba(125, 211, 225, 0.04) 19px
    ),
    linear-gradient(
      100deg,
      transparent 0%,
      rgba(94, 200, 216, 0.12) 30%,
      rgba(13, 36, 112, 0.08) 55%,
      rgba(240, 247, 255, 0.2) 72%,
      transparent 100%
    );
  background-size: auto, 220% 100%;
  animation: sapphireShift 22s ease-in-out infinite alternate;
}

@keyframes sapphireShift {
  from { background-position: 0 0, 0% 50%; }
  to { background-position: 0 0, 100% 50%; }
}

main,
.site-header,
.site-footer,
.cookie-banner {
  position: relative;
  z-index: 1;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--sapphire-mid);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
  transition: color 0.25s var(--ease-crystal);
}

a:hover {
  color: var(--cyan);
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--indigo);
}

h1 { font-size: clamp(1.85rem, 4.5vw, 3rem); font-weight: 700; }
h2 { font-size: clamp(1.35rem, 2.6vw, 1.95rem); }
h3 { font-size: 1.18rem; }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(18px) saturate(1.2);
  background: rgba(232, 240, 251, 0.78);
  border-bottom: 1px solid var(--line);
}

.site-header__inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0.75rem var(--space);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  text-decoration: none;
  color: var(--indigo);
}

.brand__mark {
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 50%;
  background:
    radial-gradient(circle at 35% 30%, var(--white-hl), transparent 45%),
    radial-gradient(circle at 70% 70%, var(--cyan), var(--sapphire));
  box-shadow: 0 0 0 1px rgba(94, 200, 216, 0.35);
}

.brand__text {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  cursor: pointer;
}

.nav-toggle__bar {
  display: block;
  width: 1.15rem;
  height: 2px;
  margin: 0 auto;
  background: var(--sapphire);
  transition: transform 0.3s var(--ease-crystal);
}

.site-nav ul {
  display: flex;
  align-items: center;
  gap: 1.35rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a {
  text-decoration: none;
  font-weight: 500;
  font-size: 0.98rem;
  color: var(--ink-soft);
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--sapphire);
}

@media (max-width: 820px) {
  .nav-toggle { display: flex; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(232, 240, 251, 0.96);
    border-bottom: 1px solid var(--line);
    padding: 0.75rem var(--space) 1.25rem;
    display: none;
  }

  .site-nav.is-open { display: block; }

  .site-nav ul {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.85rem;
  }
}

/* Buttons */
.btn {
  position: relative;
  overflow: hidden;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.78rem 1.35rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.35s var(--ease-crystal), box-shadow 0.35s var(--ease-crystal), background 0.3s ease;
}

.btn--sapphire {
  color: var(--white-hl);
  background:
    linear-gradient(135deg, var(--sapphire-soft), var(--sapphire) 55%, var(--indigo-mid));
  box-shadow:
    0 0 0 1px rgba(125, 211, 225, 0.25),
    0 10px 28px rgba(13, 36, 112, 0.28);
}

.btn--sapphire:hover {
  color: var(--white-hl);
  transform: translateY(-1px);
  box-shadow:
    0 0 0 1px rgba(125, 211, 225, 0.45),
    0 14px 34px rgba(13, 36, 112, 0.35);
}

.btn--ghost {
  color: var(--sapphire);
  background: rgba(240, 247, 255, 0.55);
  border-color: rgba(13, 36, 112, 0.22);
}

.btn--ghost:hover {
  color: var(--indigo);
  background: rgba(240, 247, 255, 0.9);
}

.crystal-wave {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  background:
    radial-gradient(circle, rgba(240, 247, 255, 0.55) 0%, rgba(94, 200, 216, 0.35) 35%, transparent 70%);
  animation: crystalWave 0.9s var(--ease-crystal) forwards;
}

@keyframes crystalWave {
  from { transform: scale(0.15); opacity: 0.9; }
  to { transform: scale(1); opacity: 0; }
}

.text-link {
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid rgba(94, 200, 216, 0.6);
}

/* Hero — asymmetric resonance layout */
.hero--resonance {
  position: relative;
  min-height: min(92vh, 54rem);
  display: grid;
  align-items: end;
  overflow: hidden;
}

.hero__plane {
  position: absolute;
  inset: 0;
}

.hero__plane img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero__crystal {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(105deg, rgba(13, 36, 112, 0.82) 0%, rgba(26, 21, 64, 0.55) 42%, rgba(26, 58, 143, 0.35) 68%, rgba(94, 200, 216, 0.2) 100%),
    repeating-linear-gradient(
      -12deg,
      transparent 0,
      transparent 28px,
      rgba(125, 211, 225, 0.05) 28px,
      rgba(125, 211, 225, 0.05) 29px
    );
  animation: crystalPulse 10s ease-in-out infinite alternate;
}

@keyframes crystalPulse {
  from { opacity: 1; }
  to { opacity: 0.88; }
}

.hero__copy {
  position: relative;
  z-index: 2;
  max-width: 38rem;
  margin: 0 0 clamp(2.5rem, 8vh, 5rem) clamp(1rem, 6vw, 5rem);
  padding: clamp(1.5rem, 3vw, 2.25rem);
  background: linear-gradient(145deg, rgba(240, 247, 255, 0.14), rgba(13, 36, 112, 0.28));
  border: 1px solid rgba(125, 211, 225, 0.28);
  backdrop-filter: blur(10px);
  color: var(--white-hl);
  animation: heroRise 1s var(--ease-crystal) both;
}

@keyframes heroRise {
  from { opacity: 0; transform: translateY(1.25rem); }
  to { opacity: 1; transform: translateY(0); }
}

.hero__brand {
  margin: 0 0 0.65rem;
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 3.5vw, 2.35rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--cyan-bright);
  text-shadow: 0 0 24px rgba(94, 200, 216, 0.35);
}

.hero__copy h1 {
  margin: 0 0 0.85rem;
  color: var(--white-hl);
  font-size: clamp(1.45rem, 3.2vw, 2.15rem);
  font-weight: 600;
}

.hero__lead {
  margin: 0 0 1.35rem;
  color: rgba(240, 247, 255, 0.88);
  font-size: 1.05rem;
  max-width: 32rem;
}

@media (max-width: 640px) {
  .hero--resonance { min-height: 85vh; }
  .hero__copy {
    margin: 0 var(--space) 1.75rem;
  }
}

/* Sections */
.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(2.5rem, 6vw, 4.5rem) var(--space);
}

.section--glass {
  background: linear-gradient(160deg, rgba(240, 247, 255, 0.55), rgba(94, 200, 216, 0.08));
  border-block: 1px solid var(--line);
  max-width: none;
  padding-inline: max(var(--space), calc((100% - var(--max)) / 2 + var(--space)));
}

.section--indigo {
  background:
    linear-gradient(135deg, rgba(26, 21, 64, 0.92), rgba(13, 36, 112, 0.88));
  color: var(--white-hl);
  max-width: none;
  padding-inline: max(var(--space), calc((100% - var(--max)) / 2 + var(--space)));
}

.section--indigo h2,
.section--indigo h3 {
  color: var(--white-hl);
}

.section--indigo p {
  color: rgba(240, 247, 255, 0.86);
}

.section__kicker {
  margin: 0 0 0.4rem;
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cyan);
}

.section__head {
  max-width: 40rem;
  margin-bottom: 2rem;
}

.section__head p {
  color: var(--muted);
}

.section__grid--split {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: center;
}

@media (max-width: 800px) {
  .section__grid--split { grid-template-columns: 1fr; }
}

.section__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 1.75rem;
}

.price-line {
  font-weight: 600;
  color: var(--sapphire-mid);
}

.section--indigo .price-line { color: var(--cyan-bright); }

/* Quote */
.quote {
  margin: 0;
  padding: 1.75rem 1.5rem 1.75rem 1.75rem;
  border-left: 3px solid var(--cyan);
  background: var(--surface);
  box-shadow: inset 0 0 40px rgba(94, 200, 216, 0.08);
}

.quote p {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2.2vw, 1.4rem);
  line-height: 1.55;
  color: var(--indigo);
}

.quote footer {
  color: var(--muted);
  font-size: 0.95rem;
}

/* Media */
.media-frame {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid rgba(125, 211, 225, 0.35);
  box-shadow:
    0 18px 40px rgba(13, 36, 112, 0.18),
    inset 0 0 0 1px rgba(240, 247, 255, 0.25);
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 5 / 4;
}

.media-frame--sm img { aspect-ratio: 4 / 3; }

/* Offers */
.offer-rail {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.offer-rail a {
  display: grid;
  grid-template-columns: 7.5rem 1fr auto;
  gap: 1rem;
  align-items: start;
  padding: 1.1rem 1.15rem;
  text-decoration: none;
  color: inherit;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.25s ease, transform 0.3s var(--ease-crystal);
}

.offer-rail a:hover {
  border-color: rgba(94, 200, 216, 0.55);
  transform: translateX(4px);
}

.offer-rail__meta {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--cyan);
}

.offer-rail__title {
  display: block;
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--indigo);
  margin-bottom: 0.25rem;
}

.offer-rail__short {
  display: block;
  color: var(--muted);
  font-size: 0.95rem;
}

.offer-rail__price {
  font-weight: 600;
  color: var(--sapphire-mid);
  white-space: nowrap;
}

@media (max-width: 700px) {
  .offer-rail a {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }
}

/* Evidence */
.evidence {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  counter-reset: evid;
}

.evidence li {
  counter-increment: evid;
  padding-top: 0.5rem;
}

.evidence li::before {
  content: counter(evid, decimal-leading-zero);
  display: block;
  margin-bottom: 0.55rem;
  font-family: var(--font-display);
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  color: var(--cyan-bright);
}

.evidence h3 { margin: 0 0 0.4rem; }

@media (max-width: 800px) {
  .evidence { grid-template-columns: 1fr; }
}

/* Team */
.team-rail {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.team-rail img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: var(--radius);
  margin-bottom: 0.85rem;
  border: 1px solid rgba(125, 211, 225, 0.3);
}

.team-rail h3 { margin: 0 0 0.2rem; }

.team-rail__role {
  margin: 0 0 0.5rem;
  font-weight: 600;
  color: var(--sapphire-mid);
  font-size: 0.95rem;
}

.team-rail p:last-child {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

@media (max-width: 800px) {
  .team-rail { grid-template-columns: 1fr; max-width: 22rem; }
}

/* Page hero */
.page-hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(2.25rem, 5vw, 3.5rem) var(--space) 0.5rem;
}

.page-hero--media {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2rem;
  align-items: center;
  padding-bottom: 1rem;
}

.eyebrow {
  margin: 0 0 0.4rem;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--cyan);
}

@media (max-width: 800px) {
  .page-hero--media { grid-template-columns: 1fr; }
}

/* Services / blog index */
.service-index {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.service-index__row {
  display: grid;
  grid-template-columns: 16rem 1fr;
  gap: 1.5rem;
  align-items: center;
}

.service-index__row h2 { margin: 0 0 0.4rem; }
.service-index__row h2 a { text-decoration: none; color: inherit; }

@media (max-width: 700px) {
  .service-index__row { grid-template-columns: 1fr; }
}

.blog-index {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.blog-index__item a {
  display: grid;
  grid-template-columns: 14rem 1fr;
  gap: 1.35rem;
  text-decoration: none;
  color: inherit;
}

.blog-index__item time {
  display: block;
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 0.3rem;
}

.blog-index__item h2 {
  margin: 0 0 0.4rem;
  font-size: 1.25rem;
}

.blog-index__item p {
  margin: 0;
  color: var(--muted);
}

@media (max-width: 700px) {
  .blog-index__item a { grid-template-columns: 1fr; }
}

/* Process */
.process-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.process-steps li {
  counter-increment: step;
  padding: 1.35rem 1.35rem 1.35rem 4.5rem;
  position: relative;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.process-steps li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 1.1rem;
  top: 1.35rem;
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--cyan);
}

.process-steps h2 {
  margin: 0 0 0.45rem;
  font-size: 1.2rem;
}

.process-steps p { margin: 0; color: var(--muted); }

/* Prose / legal */
.prose {
  max-width: 44rem;
}

.prose p { margin: 0 0 1rem; }

.legal h2 {
  margin: 2rem 0 0.65rem;
  font-size: 1.2rem;
}

.check-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding: 0.45rem 0 0.45rem 1.5rem;
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.85rem;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--cyan-bright), var(--sapphire));
}

/* Forms */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: inset 0 0 30px rgba(94, 200, 216, 0.06);
}

.form-field label {
  display: block;
  margin-bottom: 0.35rem;
  font-weight: 600;
  font-size: 0.95rem;
}

.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  padding: 0.7rem 0.8rem;
  border: 1px solid rgba(13, 36, 112, 0.22);
  border-radius: var(--radius);
  background: rgba(240, 247, 255, 0.85);
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--ink);
}

.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  outline: 2px solid rgba(94, 200, 216, 0.55);
  outline-offset: 1px;
}

.form-field input[aria-invalid="true"],
.form-field select[aria-invalid="true"],
.form-field textarea[aria-invalid="true"] {
  border-color: #b33a5a;
}

.field-error {
  margin: 0.35rem 0 0;
  font-size: 0.88rem;
  color: #9b2c48;
}

.form-status {
  margin: 0.35rem 0 0;
  padding: 0.7rem 0.85rem;
  border-radius: var(--radius);
  font-weight: 500;
}

.form-status--success {
  background: rgba(94, 200, 216, 0.18);
  color: var(--sapphire);
}

.form-status--error {
  background: rgba(179, 58, 90, 0.12);
  color: #9b2c48;
}

/* Footer */
.site-footer {
  margin-top: 2rem;
  padding: 3rem var(--space) 1.5rem;
  background: linear-gradient(180deg, rgba(26, 21, 64, 0.94), rgba(13, 36, 112, 0.96));
  color: rgba(240, 247, 255, 0.85);
}

.site-footer a { color: var(--cyan-bright); }
.site-footer a:hover { color: var(--white-hl); }

.site-footer__grid {
  max-width: var(--max);
  margin: 0 auto 2rem;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 2rem;
}

.footer-brand {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--white-hl);
}

.footer-tagline,
.footer-address {
  margin: 0 0 0.5rem;
  color: rgba(240, 247, 255, 0.72);
}

.footer-heading {
  margin: 0 0 0.75rem;
  font-weight: 600;
  color: var(--cyan-bright);
}

.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-links li { margin-bottom: 0.4rem; }
.footer-links a { text-decoration: none; }

.site-footer__bottom {
  max-width: var(--max);
  margin: 0 auto;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(125, 211, 225, 0.2);
  font-size: 0.9rem;
  color: rgba(240, 247, 255, 0.55);
}

@media (max-width: 800px) {
  .site-footer__grid { grid-template-columns: 1fr; }
}

/* Cookie banner */
.cookie-banner {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 60;
  padding: 1rem var(--space);
  background: linear-gradient(135deg, rgba(26, 21, 64, 0.96), rgba(13, 36, 112, 0.94));
  border-top: 1px solid rgba(125, 211, 225, 0.3);
  box-shadow: 0 -12px 40px rgba(13, 36, 112, 0.35);
  color: var(--white-hl);
}

.cookie-banner__inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.cookie-banner p { margin: 0; max-width: 42rem; }
.cookie-banner a { color: var(--cyan-bright); }

.cookie-banner__actions {
  display: flex;
  gap: 0.65rem;
}

/* 404 */
.error-page {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(4rem, 12vw, 7rem) var(--space);
  text-align: center;
}

.error-page h1 { margin-bottom: 0.75rem; }
.error-page p { color: var(--muted); }