/* === ISTANTIA DESIGN SYSTEM === */
/* Brand: istantia.com — AI-first rapid prototyping */
/* Fonts: Space Mono (display) + JetBrains Mono (body) */

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

:root {
  /* Istantia Palette */
  --bg: #0D0F12;
  --bg-elevated: #14171C;
  --nav-bg: rgba(13, 15, 18, 0.8);
  --nav-bg-scrolled: rgba(13, 15, 18, 0.95);
  --accent: #00D4AA;
  --accent-hover: #00E8BC;
  --accent-dim: #007A63;
  --success: #00D4AA;
  --error: #FF7A7A;
  --text: #E8ECEF;
  --text-dim: #6B7580;
  --border: #1F242B;
  --placeholder: #FFB547;
  --radius: 4px;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-weight: 300;
  font-size: 15px;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

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

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

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* === Navigation === */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: background 0.2s ease;
}

.nav.nav-scrolled {
  background: var(--nav-bg-scrolled);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: 'Space Mono', monospace;
  font-size: 1.15rem;
  font-weight: 400;
  letter-spacing: -0.04em;
  color: var(--text);
  position: relative;
}

.nav-logo .cursor {
  display: inline-block;
  width: 2px;
  height: 1.1em;
  background: var(--accent);
  margin-left: 2px;
  vertical-align: text-bottom;
  animation: cursorBlink 1.4s step-end infinite;
}

@keyframes cursorBlink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--text-dim);
  transition: color 0.2s;
  letter-spacing: 0.02em;
}

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

.nav-cta {
  background: var(--accent);
  color: var(--bg) !important;
  padding: 8px 20px;
  border-radius: var(--radius);
  font-weight: 500;
  transition: background 0.2s, transform 0.15s;
}

.nav-cta:hover {
  background: var(--accent-hover);
}

/* Mobile toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--text);
  border-radius: 1px;
  transition: transform 0.3s, opacity 0.3s;
}

.nav-toggle.active span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* === Hero === */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
  position: relative;
  overflow: hidden;
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero-eyebrow {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 24px;
}

.hero-title {
  font-family: 'Space Mono', monospace;
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.15;
  max-width: 750px;
  margin: 0 auto 24px;
  color: var(--text);
}

.hero-title .cursor {
  display: inline-block;
  width: 3px;
  height: 0.85em;
  background: var(--accent);
  margin-left: 4px;
  vertical-align: baseline;
  animation: cursorBlink 1.4s step-end infinite;
}

.hero-sub {
  font-family: 'JetBrains Mono', monospace;
  font-size: clamp(0.9rem, 1.5vw, 1.05rem);
  font-weight: 300;
  color: var(--text-dim);
  max-width: 560px;
  margin: 0 auto 48px;
  line-height: 1.7;
}

/* Discovery Arc */
.discovery-arc {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 48px;
  height: 32px;
  position: relative;
}

.arc-bar {
  width: 3px;
  height: 20px;
  background: var(--text-dim);
  border-radius: 1px;
  opacity: 0.4;
  transition: transform 1.2s cubic-bezier(0.2, 0.8, 0.2, 1),
              opacity 1.2s cubic-bezier(0.2, 0.8, 0.2, 1),
              background 0.6s ease;
}

.arc-bar.accent {
  background: var(--accent);
  opacity: 1;
}

.discovery-arc.resolved .arc-bar {
  transform: translateY(0) !important;
  opacity: 0.6;
}

.discovery-arc.resolved .arc-bar.accent {
  opacity: 1;
}

.arc-labels {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-bottom: 56px;
}

.arc-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-dim);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.arc-label.visible {
  opacity: 1;
  transform: translateY(0);
}

.arc-label span {
  color: var(--accent);
  margin-right: 6px;
}

/* === Buttons === */
.btn {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  font-weight: 500;
  border: none;
  cursor: pointer;
  border-radius: var(--radius);
  transition: background 0.2s, transform 0.15s;
  letter-spacing: 0.02em;
}

.btn:active {
  transform: scale(0.98);
}

.btn:disabled {
  cursor: not-allowed;
  opacity: 0.7;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg);
  padding: 14px 32px;
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-secondary {
  background: transparent;
  color: var(--accent);
  padding: 14px 32px;
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--accent);
}

/* === Sections === */
.section {
  padding: 100px 0;
}

.section-elevated {
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-title {
  font-family: 'Space Mono', monospace;
  font-size: clamp(1.6rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
  text-align: center;
  color: var(--text);
}

.section-eyebrow {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  text-align: center;
  margin-bottom: 12px;
}

.section-eyebrow-left {
  text-align: left;
}

.section-sub {
  font-size: 0.95rem;
  font-weight: 300;
  color: var(--text-dim);
  max-width: 600px;
  margin: 0 auto 56px;
  text-align: center;
  line-height: 1.7;
}

/* === Card Grid === */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: border-color 0.3s, transform 0.25s;
}

.card:hover {
  border-color: var(--accent-dim);
  transform: translateY(-2px);
}

.card-icon {
  color: var(--accent);
  margin-bottom: 20px;
}

.card h3 {
  font-family: 'Space Mono', monospace;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.card p {
  font-size: 0.88rem;
  font-weight: 300;
  color: var(--text-dim);
  line-height: 1.7;
}

/* === Industries === */
.industries {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 48px;
  margin-bottom: 80px;
}

.industry-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--text-dim);
  border: 1px solid var(--border);
  border-radius: 2px;
  padding: 6px 16px;
  letter-spacing: 0.04em;
  transition: border-color 0.2s, color 0.2s;
}

.industry-tag:hover {
  border-color: var(--accent);
  color: var(--text);
}

/* === How It Works (Steps) === */
.how-it-works {
  padding-top: 20px;
}

.steps {
  display: flex;
  align-items: flex-start;
  gap: 0;
  margin-top: 16px;
}

.step {
  flex: 1;
  text-align: center;
  padding: 32px 20px;
}

.step-number {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1.5px solid var(--accent);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Space Mono', monospace;
  font-size: 1rem;
  font-weight: 400;
  margin: 0 auto 16px;
}

.step-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}

.step h3 {
  font-family: 'Space Mono', monospace;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.step p {
  font-size: 0.88rem;
  font-weight: 300;
  color: var(--text-dim);
  line-height: 1.7;
}

.step strong {
  color: var(--accent);
  font-weight: 500;
}

.step-connector {
  width: 48px;
  height: 1.5px;
  background: var(--border);
  margin-top: 52px;
  flex-shrink: 0;
}

/* === Case Studies === */
.case-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: border-color 0.3s, transform 0.25s;
  display: flex;
  flex-direction: column;
}

.case-card:hover {
  border-color: var(--accent-dim);
  transform: translateY(-2px);
}

.case-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: 16px;
}

.case-card h3 {
  font-family: 'Space Mono', monospace;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
  line-height: 1.4;
}

.case-card p {
  font-size: 0.88rem;
  font-weight: 300;
  color: var(--text-dim);
  line-height: 1.7;
  flex-grow: 1;
}

.case-card a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.case-card a:hover {
  color: var(--accent-hover);
}

.case-result {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.result-metric {
  display: block;
  font-family: 'Space Mono', monospace;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 4px;
}

.result-label {
  font-size: 0.8rem;
  font-weight: 300;
  color: var(--text-dim);
}

/* === Value Section === */
.value-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.value-card {
  padding: 28px 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  transition: border-color 0.3s;
}

.value-card:hover {
  border-color: var(--accent-dim);
}

.value-card h3 {
  font-family: 'Space Mono', monospace;
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.value-card p {
  font-size: 0.85rem;
  font-weight: 300;
  color: var(--text-dim);
  line-height: 1.7;
}

/* === Why Section (Bottom CTA-like) === */
.why-section {
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
}

.why-section p {
  font-size: 0.95rem;
  font-weight: 300;
  color: var(--text-dim);
  line-height: 1.8;
  margin-bottom: 40px;
}

.why-stats {
  display: flex;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
}

.why-stat {
  text-align: center;
}

.why-stat .stat-label {
  display: block;
  font-family: 'Space Mono', monospace;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 4px;
}

.why-stat .stat-desc {
  font-size: 0.75rem;
  color: var(--text-dim);
  letter-spacing: 0.02em;
}

/* === Contact === */
.contact-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.contact-text .section-title {
  text-align: left;
}

.contact-text .section-sub {
  text-align: left;
  margin: 0 0 32px;
}

.contact-email {
  font-family: 'Space Mono', monospace;
  font-size: 1.05rem;
  color: var(--accent);
  font-weight: 400;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
  letter-spacing: -0.02em;
}

.contact-email:hover {
  border-bottom-color: var(--accent);
}

.contact-arrow {
  display: inline-block;
  margin-left: 6px;
  transition: transform 0.2s;
}

.contact-email:hover .contact-arrow {
  transform: translateX(4px);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.contact-form input,
.contact-form textarea {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.88rem;
  font-weight: 300;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  color: var(--text);
  transition: border-color 0.2s;
  outline: none;
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: var(--accent);
}

.contact-form input[aria-invalid="true"],
.contact-form textarea[aria-invalid="true"] {
  border-color: var(--error);
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: var(--text-dim);
  opacity: 0.5;
}

.contact-form textarea {
  resize: vertical;
  min-height: 100px;
}

.contact-form .btn {
  align-self: flex-start;
}

.contact-status {
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--text-dim);
}

.contact-status.is-success {
  color: var(--success);
}

.contact-status.is-error {
  color: var(--error);
}

/* === Footer === */
.footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  background: var(--bg);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.78rem;
  color: var(--text-dim);
  font-weight: 300;
}

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

.footer-links a {
  color: var(--text-dim);
  transition: color 0.2s;
  font-size: 0.78rem;
}

.footer-links a:hover {
  color: var(--text);
}

.footer-location {
  font-size: 0.78rem;
  color: var(--text-dim);
}

/* === Privacy Page === */
.legal-page {
  min-height: 100vh;
  padding: 120px 0 72px;
}

.legal-shell {
  max-width: 760px;
}

.legal-back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent);
  margin-bottom: 24px;
  font-size: 0.82rem;
}

.legal-content {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
}

.legal-content h1,
.legal-content h2 {
  font-family: 'Space Mono', monospace;
  letter-spacing: -0.03em;
}

.legal-content h1 {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  margin-bottom: 12px;
}

.legal-content h2 {
  font-size: 1rem;
  margin: 32px 0 12px;
}

.legal-content p,
.legal-content li {
  color: var(--text-dim);
  font-size: 0.9rem;
}

.legal-content a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.legal-content ul {
  padding-left: 20px;
}

.legal-meta {
  color: var(--text-dim);
  font-size: 0.78rem;
}

/* === Fade-in Animation === */
.fade-in {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* === Responsive === */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(13, 15, 18, 0.97);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-cta {
    text-align: center;
    width: 100%;
    display: block;
  }

  .card-grid,
  .value-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .steps {
    flex-direction: column;
    align-items: center;
  }

  .step-connector {
    width: 1.5px;
    height: 28px;
    margin: 0;
  }

  .step {
    padding: 20px;
  }

  .contact-container {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .contact-text .section-title,
  .contact-text .section-sub {
    text-align: center;
  }

  .section-eyebrow-left {
    text-align: center;
  }

  .contact-email {
    display: block;
    text-align: center;
  }

  .contact-form .btn {
    align-self: stretch;
  }

  .hero {
    padding: 100px 24px 60px;
  }

  .section {
    padding: 72px 0;
  }

  .industries {
    margin-bottom: 60px;
  }

  .footer-inner {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  .arc-labels {
    gap: 24px;
    flex-wrap: wrap;
  }

  .why-stats {
    gap: 24px;
  }

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

  .legal-content {
    padding: 24px 20px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.75rem;
  }

  .section-title {
    font-size: 1.4rem;
  }

  .arc-labels {
    gap: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }

  .fade-in {
    opacity: 1;
    transform: none;
  }

  .arc-label {
    opacity: 1;
    transform: none;
  }
}