@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700&family=JetBrains+Mono:wght@400;700&display=swap');

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

:root {
  --bg-main: #F9F8F6;
  --bg-card: #EFEBE0;
  --bg-white: #FFFFFF;
  --accent-olive: #5A624D;
  --accent-olive-hover: #4A513F;
  --accent-olive-light: #E8EBE0;
  --text-main: #2B2B2B;
  --text-muted: #6B7280;
  --text-light: rgba(255,255,255,0.8);
  --footer-bg: #1A1A1A;
  --border-light: rgba(0,0,0,0.06);
  --border-card: rgba(0,0,0,0.08);

  --font-sans: 'Plus Jakarta Sans', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 50px;

  --shadow-soft: 0 10px 30px rgba(0,0,0,0.04);
  --shadow-card: 0 4px 16px rgba(0,0,0,0.06);
  --shadow-hover: 0 12px 36px rgba(0,0,0,0.08);

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;

  --section-y: clamp(3rem, 6vw, 5rem);
  --section-y-tight: clamp(2rem, 4vw, 3.5rem);
  --section-y-compact: clamp(1.5rem, 3vw, 2.5rem);

  --max-width: 1200px;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.6;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.15;
  color: var(--text-main);
}
h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
}

a {
  text-decoration: none;
  color: inherit;
  transition: transform 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease, color 0.2s ease;
}

:focus-visible {
  outline: 2px solid var(--accent-olive);
  outline-offset: 4px;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

section {
  padding: var(--section-y) 0;
}

/* SKIP LINK */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 200;
  padding: 0.75rem 1.5rem;
  background-color: var(--accent-olive);
  color: #fff;
  font-weight: 600;
  border-radius: var(--radius-pill);
}
.skip-link:focus {
  top: 1rem;
}

/* BUTTONS */
.btn {
  display: inline-block;
  background-color: var(--accent-olive);
  color: #fff;
  padding: 0.9rem 2rem;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: 0.95rem;
  box-shadow: var(--shadow-soft);
  cursor: pointer;
  border: none;
}
.btn:hover {
  background-color: var(--accent-olive-hover);
  transform: translateY(-2px);
  color: #fff;
}
.btn:active {
  transform: scale(0.97);
}
.btn-outline {
  background-color: transparent;
  color: var(--text-main);
  border: 1px solid var(--text-main);
  padding: 0.85rem 1.95rem;
}
.btn-outline:hover {
  background-color: var(--text-main);
  color: #fff;
  transform: translateY(-2px);
}
.btn-outline:active {
  transform: scale(0.97);
}

/* TAGS / CHIPS */
.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-olive);
  background-color: var(--bg-card);
  padding: 0.3rem 0.8rem;
  border-radius: 4px;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.chip {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent-olive);
  background-color: var(--accent-olive-light);
  padding: 0.2rem 0.7rem;
  border-radius: var(--radius-pill);
  letter-spacing: 0.04em;
}

/* SECTION HEADER UTILITY */
.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 3rem;
}
.section-header .tag {
  margin-bottom: 1rem;
}
.section-header h2 {
  margin-bottom: 1rem;
}
.section-header p {
  font-size: 1.1rem;
  color: var(--text-muted);
}

/* SECTION SPACING CLASSES */
.section-hero {
  padding-top: clamp(2rem, 4vw, 4rem);
  padding-bottom: var(--section-y-tight);
}

.section-strip {
  padding: clamp(2rem, 4vw, 3rem) 0;
}

.section-standard {
  padding: var(--section-y) 0;
}

.section-feature {
  padding: var(--section-y-tight) 0;
}

.section-feature + .section-feature {
  padding-top: 0;
}

.section-dark {
  padding: var(--section-y) 0;
}

.section-security {
  padding: var(--section-y) 0;
}

/* NAVBAR */
.navbar {
  position: sticky;
  top: 1.5rem;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1.5rem;
  background-color: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-pill);
  margin: 0 auto;
  max-width: var(--max-width);
  box-shadow: var(--shadow-soft);
}
.nav-brand {
  font-weight: 700;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
}
.nav-links {
  display: flex;
  gap: 2.5rem;
  font-weight: 500;
  font-size: 0.9rem;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--accent-olive);
}
.nav-links a:active {
  transform: scale(0.97);
}

/* MOBILE NAV TOGGLE */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  color: var(--text-main);
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
}
.nav-toggle:hover {
  background-color: var(--bg-card);
}

/* MOBILE CONTACT LINK IN DROPDOWN */
.nav-mobile-contact {
  display: none;
}

/* DESKTOP NAV CTA */
.nav-cta {
  white-space: nowrap;
}

/* 1. HERO */
.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}
.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}
.hero p {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  max-width: 480px;
}
.hero-btns {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}
.hero-status {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 2rem;
}
.hero-img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
}

/* 2. STACK */
.stack {
  background-color: var(--bg-card);
  text-align: center;
}
.stack h3 {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 2rem;
}
.stack-items {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: clamp(1rem, 4vw, 3rem);
  flex-wrap: wrap;
  opacity: 0.6;
}
.stack-items span {
  font-weight: 700;
  font-size: 1.25rem;
  font-family: var(--font-mono);
}

/* 3. CHALLENGE */
.challenge-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}
.challenge-item {
  background-color: var(--bg-card);
  padding: clamp(1.25rem, 3vw, 2rem);
  border-radius: var(--radius-lg);
}
.challenge-item h3 {
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.challenge-item p {
  color: var(--text-muted);
  font-size: 0.95rem;
}
.challenge-outcome {
  text-align: center;
  margin-top: 2.5rem;
  padding: 2rem;
  background-color: var(--accent-olive);
  color: #fff;
  border-radius: var(--radius-lg);
}
.challenge-outcome p {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.9);
  max-width: 600px;
  margin: 0 auto;
}

/* 4. MODULES */
.modules-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}
.module-card {
  background-color: var(--bg-card);
  padding: clamp(1.5rem, 4vw, 2.5rem);
  border-radius: var(--radius-lg);
  border: 1px solid transparent;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}
.module-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--border-card);
}
.module-card h3 {
  font-size: 1.4rem;
  margin-bottom: 0.75rem;
}
.module-card p {
  color: var(--text-muted);
}
.icon-box {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background-color: var(--accent-olive-light);
  margin-bottom: 1.5rem;
}
.icon-box svg {
  display: block;
}

/* 5 & 6. FEATURES */
.feature-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}
.feature-split.reverse {
  direction: rtl;
}
.feature-split.reverse > * {
  direction: ltr;
}
.feature-img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius-lg);
}
.feature-split p {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

/* 7. WORKFLOW / ARCHITECTURE */
.architecture {
  background-color: var(--accent-olive);
  color: var(--bg-white);
}
.architecture h2 {
  color: var(--bg-white);
}
.architecture p {
  color: var(--text-light);
}
.arch-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}
.arch-steps {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.arch-step {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background-color: rgba(255,255,255,0.08);
  border-radius: var(--radius-md);
}
.arch-step:hover {
  background-color: rgba(255,255,255,0.12);
}
.step-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  min-width: 32px;
  border-radius: 50%;
  background-color: rgba(255,255,255,0.15);
  font-weight: 700;
  font-size: 0.85rem;
  color: #fff;
}
.step-content h4 {
  font-size: 1rem;
  color: #fff;
  margin-bottom: 0.2rem;
}
.step-content p {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.7);
}
.arch-code {
  background-color: rgba(0, 0, 0, 0.25);
  padding: 2rem;
  border-radius: var(--radius-lg);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: #EFEBE0;
  overflow-x: auto;
  white-space: pre;
}
.arch-code code {
  font-family: inherit;
}

/* 8. SECURITY / COMPLIANCE */
.compliance {
  background-color: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: clamp(2rem, 5vw, 4rem) clamp(1.25rem, 4vw, 3rem);
  text-align: center;
}
.compliance-content {
  max-width: 700px;
  margin: 0 auto;
}
.compliance p {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 3rem;
}
.compliance-data {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1.5rem;
  text-align: left;
}
.data-point {
  display: flex;
  flex-direction: column;
}
.data-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.data-value {
  font-size: 1.25rem;
  font-weight: 700;
}

/* 9. FOOTER */
footer {
  background-color: var(--footer-bg);
  color: var(--bg-main);
  padding: 5rem 0 2rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4rem;
  align-items: end;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  padding-bottom: 3rem;
  margin-bottom: 2rem;
}
.footer-logo {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
}
.footer-desc {
  color: rgba(255,255,255,0.6);
  max-width: 400px;
}
.footer-contact {
  text-align: right;
}
.footer-contact p {
  color: rgba(255,255,255,0.6);
  margin-bottom: 0.5rem;
}
.footer-email {
  font-size: 2rem;
  font-weight: 700;
  color: #fff;
  overflow-wrap: anywhere;
  word-break: break-all;
}
.footer-email:hover {
  color: var(--bg-card);
}
.footer-bottom {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.7);
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* SCROLL MARGINS FOR STICKY NAV */
#challenge, #modules, #architecture, #security {
  scroll-margin-top: 6rem;
}

/* RESPONSIVE */
@media (max-width: 900px) {
  .hero, .feature-split, .arch-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  .feature-split.reverse {
    direction: ltr;
  }
  .hero-img, .feature-img {
    height: auto;
    max-height: none;
  }
  .nav-links {
    display: none;
  }
  .nav-toggle {
    display: flex;
  }
  .nav-cta {
    display: none;
  }
  .nav-mobile-contact {
    display: block;
    background: var(--accent-olive);
    color: #fff;
    text-align: center;
    margin-top: 0.5rem;
  }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: calc(100% + 0.5rem);
    left: 0;
    right: 0;
    background-color: rgba(255,255,255,0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    padding: 1rem;
    gap: 0.5rem;
    box-shadow: var(--shadow-hover);
  }
  .nav-links.open a {
    display: block;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 1rem;
  }
  .nav-links.open a:hover {
    background-color: var(--bg-card);
  }
  .navbar {
    max-width: calc(100% - 2rem);
  }
  .modules-grid {
    grid-template-columns: 1fr;
  }
  .challenge-grid {
    grid-template-columns: 1fr;
  }
  .compliance-data {
    text-align: center;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    align-items: start;
    gap: 2rem;
  }
  .footer-contact {
    text-align: left;
  }
  .section-header {
    margin-bottom: 2rem;
  }
}

@media (max-width: 640px) {
  .hero {
    gap: 2rem;
  }
  .hero h1 {
    font-size: clamp(2rem, 8vw, 2.8rem);
  }
  .hero p {
    font-size: 1rem;
  }
  .hero-btns {
    flex-direction: column;
  }
  .hero-btns .btn {
    text-align: center;
  }
  .hero-img, .feature-img {
    height: auto;
    max-height: none;
  }
  .module-card {
    padding: clamp(1.5rem, 4vw, 2.5rem);
  }
  .compliance {
    padding: clamp(2rem, 5vw, 4rem) clamp(1.25rem, 4vw, 3rem);
  }
  .footer-email {
    font-size: 1.4rem;
  }
  .arch-code {
    font-size: 0.75rem;
    padding: 1.25rem;
  }
  .arch-grid {
    gap: 2rem;
  }
  .navbar {
    padding: 0.6rem 1rem;
  }
  .nav-brand {
    font-size: 0.95rem;
  }
  .container {
    padding: 0 1.25rem;
  }
  .challenge-item {
    padding: clamp(1.25rem, 3vw, 2rem);
  }
}

@media (max-width: 420px) {
  .hero h1 {
    font-size: 1.75rem;
  }
  .hero-img, .feature-img {
    height: auto;
    max-height: none;
  }
  .stack-items {
    gap: 1.5rem;
  }
  .stack-items span {
    font-size: 1rem;
  }
  .footer-email {
    font-size: 1.15rem;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  .module-card {
    padding: 1.5rem;
  }
}

/* ACCESSIBILITY */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .module-card:hover {
    transform: none;
  }
}