/* ===== Terravision — Satellite Intelligence for Mineral Exploration ===== */

:root {
  --navy: #0b1b2b;
  --navy-deep: #071320;
  --navy-light: #142a40;
  --slate: #3d4c5a;
  --slate-light: #8a99a8;
  --gold: #d4af37;
  --gold-bright: #e8c96b;
  --copper: #b87333;
  --off-white: #eef2f5;
  --line: rgba(212, 175, 55, 0.25);
  --serif: "Source Serif 4", Georgia, serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --max-w: 1180px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--navy);
  color: var(--off-white);
  font-family: var(--sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 700;
  line-height: 1.15;
  margin: 0;
}

p { margin: 0; }

a { color: inherit; text-decoration: none; }

.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 32px;
}

.eyebrow {
  font-family: var(--sans);
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
  font-weight: 600;
}

.grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(212, 175, 55, 0.14) 1px, transparent 1px),
    linear-gradient(90deg, rgba(212, 175, 55, 0.14) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

/* ===== Buttons ===== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 16px 32px;
  font-family: var(--sans);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-radius: 3px;
  cursor: pointer;
  border: none;
  transition: transform 0.15s ease, box-shadow 0.25s ease, background 0.2s ease;
  white-space: nowrap;
}

.btn-gold {
  background: linear-gradient(135deg, var(--gold-bright), var(--copper));
  color: var(--navy-deep);
  box-shadow: 0 0 0 rgba(212, 175, 55, 0);
}

.btn-gold:hover {
  box-shadow: 0 0 28px rgba(212, 175, 55, 0.55);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--gold);
  border: 1px solid var(--gold);
}

.btn-outline:hover {
  background: rgba(212, 175, 55, 0.1);
  box-shadow: 0 0 20px rgba(212, 175, 55, 0.25);
}

.btn-block { width: 100%; }

/* ===== Nav ===== */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(7, 19, 32, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.logo {
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--off-white);
}

.logo span { color: var(--gold); }

.nav-links {
  display: flex;
  gap: 36px;
  align-items: center;
}

.nav-links a {
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--slate-light);
  font-weight: 600;
  transition: color 0.2s ease;
}

.nav-links a:hover { color: var(--gold); }

.nav-cta { display: flex; }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--off-white);
  font-size: 1.6rem;
  cursor: pointer;
}

/* ===== Hero ===== */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: 76px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: url("../images/hero-satellite.jpg") center 30% / cover no-repeat;
  filter: saturate(1.1) contrast(1.05);
  animation: driftBg 40s ease-in-out infinite alternate;
}

@keyframes driftBg {
  0% { transform: scale(1.04) translate(0, 0); }
  100% { transform: scale(1.12) translate(-1.5%, -1%); }
}

.hero-scrim {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(7, 19, 32, 0.55) 0%, rgba(7, 19, 32, 0.86) 55%, var(--navy-deep) 100%),
    linear-gradient(100deg, rgba(11, 27, 43, 0.9) 15%, rgba(11, 27, 43, 0.35) 60%);
}

.hero .grid-overlay { opacity: 0.55; }

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 760px;
  padding: 120px 0 100px;
}

.hero-content h1 {
  font-size: clamp(2.4rem, 5vw, 3.9rem);
  color: var(--gold-bright);
  margin-bottom: 24px;
  text-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
}

.hero-sub {
  font-size: 1.15rem;
  color: var(--slate-light);
  max-width: 560px;
  margin-bottom: 40px;
}

.hero-actions {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 56px;
}

.hero-stats {
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
  border-top: 1px solid var(--line);
  padding-top: 28px;
}

.hero-stat .num {
  font-family: var(--serif);
  font-size: 1.9rem;
  color: var(--gold);
  display: block;
}

.hero-stat .label {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--slate-light);
}

/* ===== Section base ===== */

section { position: relative; }

.section-pad { padding: 120px 0; }

.section-head {
  max-width: 640px;
  margin-bottom: 64px;
}

.section-head h2 {
  font-size: clamp(1.9rem, 3.4vw, 2.7rem);
  color: var(--off-white);
  margin-top: 14px;
}

.section-head p {
  color: var(--slate-light);
  font-size: 1.05rem;
  margin-top: 18px;
}

.divider {
  width: 64px;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), var(--copper));
  margin: 20px 0;
}

.alt-bg { background: var(--navy-light); }

/* ===== The Science ===== */

.science {
  background: var(--navy-deep);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.science-texture {
  position: absolute;
  top: 0;
  right: 0;
  width: 42%;
  height: 100%;
  opacity: 0.16;
  background: url("../images/hyperspectral-texture.jpg") center / cover no-repeat;
  mask-image: linear-gradient(90deg, transparent, black 35%);
  -webkit-mask-image: linear-gradient(90deg, transparent, black 35%);
}

.science-body {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 44px;
  max-width: 780px;
}

.science-block {
  padding-left: 24px;
  border-left: 2px solid var(--line);
}

.science-block h4 {
  font-family: var(--sans);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 12px;
}

.science-block p {
  color: var(--slate-light);
  font-size: 1.02rem;
}

.layer-list {
  list-style: none;
  margin: 18px 0 18px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.layer-list li {
  font-size: 0.92rem;
  color: var(--off-white);
  background: rgba(212, 175, 55, 0.07);
  border: 1px solid var(--line);
  padding: 12px 14px;
  border-radius: 4px;
}

.layer-list li b { color: var(--gold); display: block; font-size: 0.7rem; letter-spacing: 0.05em; text-transform: uppercase; margin-bottom: 4px; }

.fusion-note {
  margin-top: 18px;
  font-size: 0.92rem;
  color: var(--slate-light);
  font-style: italic;
  border-top: 1px dashed var(--line);
  padding-top: 16px;
}

/* ===== How It Works ===== */

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.step {
  position: relative;
  padding: 36px 28px;
  background: var(--navy-light);
  border: 1px solid var(--line);
  border-radius: 6px;
}

.step-num {
  font-family: var(--serif);
  font-size: 2.6rem;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--gold);
  margin-bottom: 18px;
  display: block;
}

.step h3 {
  font-size: 1.25rem;
  color: var(--off-white);
  margin-bottom: 12px;
}

.step p {
  color: var(--slate-light);
  font-size: 0.96rem;
}

/* ===== Why Terravision ===== */

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
}

.card {
  padding: 40px 32px;
  border-left: 1px solid var(--line);
}

.cards .card:first-child { border-left: none; padding-left: 0; }
.cards .card:last-child { padding-right: 0; }

.card-line {
  width: 40px;
  height: 2px;
  background: var(--gold);
  margin-bottom: 22px;
}

.card h3 {
  font-size: 1.3rem;
  color: var(--gold-bright);
  margin-bottom: 14px;
}

.card p {
  color: var(--slate-light);
  font-size: 0.98rem;
}

/* ===== Case Study ===== */

.case-study {
  background: var(--navy-deep);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.case-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}

.case-copy .eyebrow { margin-bottom: 18px; display: block; }

.case-copy h2 {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  margin-bottom: 22px;
}

.case-copy p {
  color: var(--slate-light);
  font-size: 1.02rem;
  margin-bottom: 16px;
}

.case-facts {
  display: flex;
  gap: 32px;
  margin-top: 28px;
  flex-wrap: wrap;
}

.case-fact .num { font-family: var(--serif); color: var(--gold); font-size: 1.5rem; display: block; }
.case-fact .label { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--slate-light); }

.case-visual {
  position: relative;
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
  background: var(--navy-light);
}

.case-visual img {
  width: 100%;
  display: block;
}

.case-visual .grid-overlay { opacity: 0.35; }

.case-caption {
  padding: 16px 20px;
  font-size: 0.82rem;
  color: var(--slate-light);
  border-top: 1px solid var(--line);
  background: rgba(0,0,0,0.25);
}

.case-caption b { color: var(--gold); }

/* ===== Pricing ===== */

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 36px;
}

.plan {
  padding: 44px 40px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--navy-light);
  position: relative;
}

.plan.featured {
  border-color: var(--gold);
  background: linear-gradient(165deg, var(--navy-light), var(--navy-deep));
}

.plan-badge {
  position: absolute;
  top: -13px;
  right: 32px;
  background: linear-gradient(135deg, var(--gold-bright), var(--copper));
  color: var(--navy-deep);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 6px 14px;
  border-radius: 3px;
}

.plan-tier {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--slate-light);
  margin-bottom: 10px;
}

.plan h3 {
  font-size: 1.4rem;
  color: var(--off-white);
  margin-bottom: 8px;
}

.plan-price {
  font-family: var(--serif);
  font-size: 2.6rem;
  color: var(--gold);
  margin: 18px 0 26px;
}

.plan-price span {
  font-family: var(--sans);
  font-size: 0.95rem;
  color: var(--slate-light);
  font-weight: 400;
}

.plan-features {
  list-style: none;
  padding: 0;
  margin: 0 0 32px;
  display: flex;
  flex-direction: column;
  gap: 13px;
}

.plan-features li {
  color: var(--slate-light);
  font-size: 0.95rem;
  padding-left: 24px;
  position: relative;
}

.plan-features li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  background: var(--gold);
  border-radius: 1px;
  transform: rotate(45deg);
}

/* ===== FAQ ===== */

.faq-list { max-width: 780px; }

.faq-item {
  border-bottom: 1px solid var(--line);
}

.faq-q {
  width: 100%;
  background: none;
  border: none;
  text-align: left;
  padding: 26px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  color: var(--off-white);
  font-family: var(--serif);
  font-size: 1.08rem;
  cursor: pointer;
}

.faq-q .icon {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border: 1px solid var(--gold);
  border-radius: 50%;
  position: relative;
  transition: transform 0.25s ease;
}

.faq-q .icon::before, .faq-q .icon::after {
  content: "";
  position: absolute;
  background: var(--gold);
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
}

.faq-q .icon::before { width: 10px; height: 1.5px; }
.faq-q .icon::after { width: 1.5px; height: 10px; transition: opacity 0.2s ease; }

.faq-item.open .faq-q .icon::after { opacity: 0; }

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.faq-a p {
  color: var(--slate-light);
  padding-bottom: 24px;
  max-width: 640px;
}

/* ===== Final CTA ===== */

.final-cta {
  text-align: center;
  padding: 140px 0;
  position: relative;
  overflow: hidden;
  background: radial-gradient(ellipse at 50% 0%, rgba(212, 175, 55, 0.12), transparent 60%), var(--navy-deep);
  border-top: 1px solid var(--line);
}

.final-cta h2 {
  font-size: clamp(2.1rem, 4vw, 3.1rem);
  color: var(--gold-bright);
  margin-bottom: 18px;
}

.final-cta p {
  color: var(--slate-light);
  font-size: 1.1rem;
  margin-bottom: 40px;
}

/* ===== Footer ===== */

footer {
  padding: 48px 0;
  border-top: 1px solid var(--line);
  background: var(--navy-deep);
}

.footer-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-row .logo { font-size: 1.05rem; }

.footer-note {
  color: var(--slate-light);
  font-size: 0.82rem;
}

/* ===== Form ===== */

.survey-form {
  max-width: 640px;
  margin: 0 auto;
  text-align: left;
  background: var(--navy-light);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 40px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-bottom: 18px;
}

.form-field { display: flex; flex-direction: column; gap: 8px; }
.form-field.full { grid-column: 1 / -1; }

.form-field label {
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--slate-light);
}

.form-field input,
.form-field select,
.form-field textarea {
  background: var(--navy-deep);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 12px 14px;
  color: var(--off-white);
  font-family: var(--sans);
  font-size: 0.95rem;
}

.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--gold);
}

.form-note {
  margin-top: 16px;
  font-size: 0.78rem;
  color: var(--slate-light);
}

/* ===== Utility / responsive ===== */

.visually-hidden {
  position: absolute;
  left: -9999px;
}

@media (max-width: 980px) {
  .steps, .cards, .pricing-grid { grid-template-columns: 1fr; }
  .cards .card { border-left: none; border-top: 1px solid var(--line); padding-left: 0; padding-top: 32px; }
  .cards .card:first-child { border-top: none; padding-top: 0; }
  .case-grid { grid-template-columns: 1fr; }
  .layer-list { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .nav-links, .nav-cta { display: none; }
  .nav-links.mobile-open, .nav-cta.mobile-open {
    display: flex;
    position: absolute;
    top: 76px;
    left: 0;
    right: 0;
    background: var(--navy-deep);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    padding: 20px 22px;
    gap: 20px;
  }
  .nav-toggle { display: block; }
  .hero-content { padding: 90px 0 70px; }
  .hero-stats { gap: 30px; }
  .section-pad { padding: 84px 0; }
  .wrap { padding: 0 22px; }
}