/* ============================================================
   Nytel Design System
   Colors: Deep Navy + Muted Teal on White
   Typography: IBM Plex Sans + IBM Plex Mono
   ============================================================ */

:root {
  --navy: #0A1628;
  --navy-light: #162035;
  --teal: #2D8B8B;
  --teal-light: #E8F4F4;
  --teal-dark: #1F6B6B;
  --white: #FFFFFF;
  --bg: #F7F8FA;
  --bg-alt: #EEF0F4;
  --border: rgba(10, 22, 40, 0.10);
  --border-strong: rgba(10, 22, 40, 0.20);
  --text: #0A1628;
  --text-secondary: rgba(10, 22, 40, 0.90);
  --text-tertiary: rgba(10, 22, 40, 0.40);
  --mono: 'IBM Plex Mono', monospace;
  --sans: 'IBM Plex Mono', monospace;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--sans);
  font-weight: 400;
  line-height: 1.6;
  color: var(--text);
  background: var(--white);
}

/* ---- Typography ---- */

h1, h2, h3, h4 {
  font-weight: 500;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.25rem, 1.5rem + 3.75vw, 4rem); }
h2 { font-size: clamp(1.5rem, 1.1rem + 2vw, 2.5rem); }
h3 { font-size: clamp(1.125rem, 1rem + 0.5vw, 1.5rem); }

p {
  max-width: 68ch;
  color: var(--text-secondary);
}

a {
  color: var(--teal-dark);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

.label {
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--teal);
}

.mono {
  font-family: var(--mono);
}

/* ---- Layout ---- */

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

@media (min-width: 768px) {
  .container { padding: 0 2.5rem; }
}

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

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: 3.5rem;
  background: var(--white);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  backdrop-filter: blur(12px);
  background: rgba(255,255,255,0.92);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.header-logo {
  text-decoration: none;
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.header-logo img {
  height: 20px;
  width: auto;
}

@media (min-width: 768px) {
  .header-logo img { height: 28px; }
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

@media (min-width: 768px) {
  .header-nav { gap: 2rem; }
}

.header-nav a {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.15s;
  white-space: nowrap;
}

@media (min-width: 768px) {
  .header-nav a { font-size: 0.8125rem; }
}

.header-nav a:hover {
  color: var(--text);
  text-decoration: none;
}

.header-nav .hide-mobile {
  display: none;
}

@media (min-width: 640px) {
  .header-nav .hide-mobile { display: inline; }
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--mono);
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 0.625rem 1.25rem;
  border: none;
  cursor: pointer;
  transition: all 0.15s;
  text-decoration: none;
}

.btn-primary {
  background: var(--navy);
  color: var(--white);
}
.btn-primary:hover {
  background: var(--navy-light);
  text-decoration: none;
  color: var(--white);
}

.btn-outline {
  background: transparent;
  color: var(--navy);
  border: 1px solid var(--border-strong);
}
.btn-outline:hover {
  border-color: var(--navy);
  text-decoration: none;
}

.btn-teal {
  background: var(--teal);
  color: var(--white);
}
.btn-teal:hover {
  background: var(--teal-dark);
  text-decoration: none;
  color: var(--white);
}

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

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 3.5rem;
  background: var(--white);
  border-bottom: 1px solid var(--border);
}

.hero-inner {
  padding: 4rem 0;
}

.hero h1 {
  color: var(--navy);
  margin-bottom: 1.5rem;
  max-width: 18ch;
}

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

.hero-sub {
  font-size: clamp(1rem, 0.9rem + 0.5vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 52ch;
  margin-bottom: 2.5rem;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  margin-top: 4rem;
}

.hero-stat {
  background: var(--white);
  padding: 1.5rem;
  text-align: center;
}

.hero-stat .stat-number {
  font-family: var(--sans);
  font-size: clamp(1.5rem, 1.2rem + 1.5vw, 2.5rem);
  font-weight: 500;
  color: var(--navy);
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 0.375rem;
}

.hero-stat .stat-label {
  font-family: var(--mono);
  font-size: 0.6875rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

@media (max-width: 640px) {
  .hero-stats {
    grid-template-columns: 1fr;
  }
}

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

.section {
  padding: 5rem 0;
  border-bottom: 1px solid var(--border);
}

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

.section-number {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--teal);
  letter-spacing: 0.08em;
  margin-bottom: 0.75rem;
  display: block;
}

.section h2 {
  color: var(--navy);
  margin-bottom: 1rem;
}

.section-lead {
  font-size: clamp(1rem, 0.9rem + 0.5vw, 1.125rem);
  color: var(--text-secondary);
  max-width: 60ch;
  margin-bottom: 3rem;
  line-height: 1.7;
}

/* ---- Problem Grid ---- */

.problem-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}

@media (min-width: 768px) {
  .problem-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.problem-card {
  background: var(--white);
  padding: 2rem;
}

.problem-card h3 {
  color: var(--navy);
  margin-bottom: 0.5rem;
}

.problem-card p {
  font-size: 0.9375rem;
  line-height: 1.6;
}

.problem-card .stat-highlight {
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--teal);
  margin-top: 0.75rem;
  display: block;
}

/* ---- Approach / Pipeline ---- */

.pipeline {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border: 1px solid var(--border);
}

@media (min-width: 768px) {
  .pipeline {
    grid-template-columns: repeat(5, 1fr);
  }
}

.pipeline-step {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border);
  position: relative;
}

@media (min-width: 768px) {
  .pipeline-step {
    border-bottom: none;
    border-right: 1px solid var(--border);
  }
  .pipeline-step:last-child {
    border-right: none;
  }
}

.pipeline-step .step-number {
  font-family: var(--mono);
  font-size: 0.6875rem;
  color: var(--teal);
  margin-bottom: 0.75rem;
  display: block;
}

.pipeline-step h3 {
  font-size: 1rem;
  color: var(--navy);
  margin-bottom: 0.375rem;
}

.pipeline-step p {
  font-size: 0.8125rem;
  line-height: 1.5;
}

/* ---- Founder ---- */

.founder-section {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
}

@media (min-width: 768px) {
  .founder-section {
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
  }
}

.founder-bio h3 {
  color: var(--navy);
  margin-bottom: 0.5rem;
}

.founder-bio .founder-title {
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--teal);
  margin-bottom: 1rem;
}

.founder-bio p {
  font-size: 0.9375rem;
  line-height: 1.7;
  margin-bottom: 1rem;
}

.credentials {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}

.credential {
  background: var(--white);
  padding: 1.25rem 1.5rem;
}

.credential .cred-label {
  font-family: var(--mono);
  font-size: 0.6875rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.25rem;
}

.credential .cred-value {
  font-size: 0.9375rem;
  color: var(--navy);
  font-weight: 500;
}

/* ---- Whitepaper CTA ---- */

.cta-section {
  background: var(--navy);
  color: var(--white);
  padding: 5rem 0;
  border-bottom: none;
}

.cta-section h2 {
  color: var(--white);
  margin-bottom: 1rem;
}

.cta-section p {
  color: rgba(255,255,255,0.65);
  margin-bottom: 2rem;
}

.cta-section .btn-teal:hover {
  background: var(--teal-dark);
}

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

.footer {
  padding: 2.5rem 0;
  border-top: 1px solid var(--border);
}

.footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-left {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

.footer-right {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.footer-right a {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* ============================================================
   Whitepaper Page
   ============================================================ */

.wp-header {
  padding-top: 7rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

.wp-header .label {
  margin-bottom: 1rem;
}

.wp-header h1 {
  margin-bottom: 0.75rem;
  max-width: 24ch;
}

.wp-header p {
  font-size: 1.0625rem;
  max-width: 56ch;
}

.wp-body {
  padding: 3rem 0 5rem;
}

.wp-content {
  max-width: 720px;
}

.wp-content h2 {
  color: var(--navy);
  margin-top: 3rem;
  margin-bottom: 1rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.wp-content h2:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.wp-content h3 {
  color: var(--navy);
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.wp-content p {
  margin-bottom: 1rem;
  font-size: 0.9375rem;
  line-height: 1.8;
  max-width: none;
  color: var(--text-secondary);
}

.wp-content strong {
  color: var(--text);
  font-weight: 600;
}

.wp-content .table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 1.5rem 0;
}

.wp-content table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  min-width: 400px;
}

@media (max-width: 640px) {
  .wp-content table { font-size: 0.8125rem; }
}

.wp-content th {
  font-family: var(--mono);
  font-size: 0.6875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-tertiary);
  text-align: left;
  padding: 0.625rem 0.75rem;
  border-bottom: 1px solid var(--border-strong);
}

.wp-content td {
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
  vertical-align: top;
}

.wp-content .col-narrow {
  width: 5rem;
}

.wp-content td strong {
  font-weight: 500;
  color: var(--text);
}

.wp-toc {
  position: sticky;
  top: 5rem;
  font-size: 0.8125rem;
}

.wp-toc-title {
  font-family: var(--mono);
  font-size: 0.6875rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 1rem;
}

.wp-toc ul {
  list-style: none;
}

.wp-toc li {
  margin-bottom: 0.5rem;
}

.wp-toc a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.15s;
}
.wp-toc a:hover {
  color: var(--teal);
}

@media (min-width: 1024px) {
  .wp-layout {
    display: grid;
    grid-template-columns: 720px 1fr;
    gap: 4rem;
  }
}

@media (max-width: 1023px) {
  .wp-toc { display: none; }
}