/* ============================================================
   cdnaptica — styles.css
   ============================================================ */

/* 1. Reset & Base
   ---------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--ink);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul, ol { list-style: none; }

/* 2. Design Tokens
   ---------------------------------------------------------- */
:root {
  --ink:         #0c1a2e;
  --ink-mid:     #334155;
  --steel:       #5a6e82;
  --blue:        #1a50cc;
  --blue-dark:   #1440aa;
  --blue-light:  #eef3ff;
  --blue-rule:   #c5d5f0;
  --rule:        #dde6f0;
  --surface:     #f4f7fb;
  --surface-mid: #e8edf5;
  --white:       #ffffff;

  --font-mono: 'SF Mono', 'Fira Code', ui-monospace, 'Courier New', monospace;

  --max-w:            1080px;
  --container-pad:    clamp(1.25rem, 5vw, 3rem);

  --radius-sm: 4px;
  --radius:    8px;
  --radius-lg: 14px;

  --shadow-sm: 0 1px 4px rgba(10,26,60,0.07);
  --shadow:    0 4px 16px rgba(10,26,60,0.09);
  --shadow-lg: 0 10px 40px rgba(10,26,60,0.12);

  --nav-h:    64px;
  --trans:    180ms ease;
}

/* 3. Layout Helpers
   ---------------------------------------------------------- */
.container {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.section {
  padding-block: clamp(3rem, 8vw, 6rem);
}

.section--alt   { background: var(--surface); }
.section--dark  { background: var(--ink); color: var(--white); }

/* 4. Typography
   ---------------------------------------------------------- */
h1, h2, h3, h4, h5 {
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-weight: 600;
  color: var(--ink);
}

.section--dark h1,
.section--dark h2,
.section--dark h3 { color: var(--white); }

.display {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.1;
}

h1 { font-size: clamp(1.8rem, 3.5vw, 2.5rem); }
h2 { font-size: clamp(1.4rem, 2.5vw, 1.9rem); }
h3 { font-size: clamp(1rem, 1.8vw, 1.2rem); }

p {
  color: var(--ink-mid);
  max-width: 68ch;
}

.section--dark p { color: #a0bcd4; }

.lead {
  font-size: clamp(1rem, 1.5vw, 1.1rem);
  color: var(--steel);
  line-height: 1.75;
  max-width: 54ch;
}

.label {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--blue);
}

.label--muted { color: var(--steel); }

/* 5. Buttons
   ---------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 0.65em 1.4em;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: background var(--trans), color var(--trans),
              border-color var(--trans), box-shadow var(--trans);
  text-decoration: none !important;
  border: 1.5px solid transparent;
  white-space: nowrap;
  line-height: 1.4;
}

.btn--primary {
  background: var(--blue);
  color: var(--white);
  border-color: var(--blue);
}
.btn--primary:hover {
  background: var(--blue-dark);
  border-color: var(--blue-dark);
  box-shadow: 0 4px 14px rgba(26,80,204,0.28);
}

.btn--outline {
  background: transparent;
  color: var(--blue);
  border-color: var(--blue);
}
.btn--outline:hover { background: var(--blue-light); }

.btn--ghost {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,0.35);
}
.btn--ghost:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.55);
}

.btn--lg { padding: 0.8em 2em; font-size: 1rem; }

/* 6. Navigation
   ---------------------------------------------------------- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(255,255,255,0.93);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--rule);
}

.site-nav .container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.nav-logo {
  font-size: 1.18rem;
  font-weight: 700;
  letter-spacing: -0.045em;
  color: var(--ink) !important;
  text-decoration: none !important;
  flex-shrink: 0;
  user-select: none;
}

.nav-logo .dot { color: var(--blue); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.2rem;
}

.nav-links a {
  display: block;
  padding: 0.4em 0.8em;
  font-size: 0.875rem;
  color: var(--ink-mid);
  border-radius: var(--radius-sm);
  transition: color var(--trans), background var(--trans);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--ink);
  background: var(--surface);
  text-decoration: none;
}

.nav-links .nav-cta {
  background: var(--blue);
  color: var(--white) !important;
  border-radius: var(--radius-sm);
  margin-left: 0.4rem;
  padding: 0.4em 1.1em;
}

.nav-links .nav-cta:hover {
  background: var(--blue-dark);
}

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: var(--radius-sm);
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: transform var(--trans), opacity var(--trans);
}

.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* 7. Footer
   ---------------------------------------------------------- */
.site-footer {
  background: var(--ink);
  padding-block: clamp(3rem, 6vw, 5rem) 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid rgba(255,255,255,0.07);
}

.footer-brand .nav-logo {
  color: var(--white) !important;
  margin-bottom: 0.85rem;
  display: inline-block;
  font-size: 1.1rem;
}

.footer-brand p {
  color: #6a8aa6;
  max-width: 32ch;
  font-size: 0.875rem;
  line-height: 1.65;
  max-width: none;
}

.footer-col h4 {
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-weight: 600;
  color: #7a9ab8;
  margin-bottom: 1rem;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.footer-col a {
  color: #5a7a96;
  font-size: 0.875rem;
  transition: color var(--trans);
}

.footer-col a:hover {
  color: var(--white);
  text-decoration: none;
}

.footer-bottom {
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-bottom p {
  color: #3a5870;
  font-size: 0.8rem;
  max-width: none;
}

/* 8. Hero
   ---------------------------------------------------------- */
.hero {
  padding-block: clamp(4rem, 10vw, 8rem);
  position: relative;
  overflow: hidden;
}

.hero__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  margin-bottom: 1.5rem;
}

.hero__eyebrow::before {
  content: '';
  display: inline-block;
  width: 20px;
  height: 2px;
  background: var(--blue);
  border-radius: 2px;
  flex-shrink: 0;
}

.hero__title { margin-bottom: 1.25rem; }

.hero__lead {
  font-size: 1.05rem;
  color: var(--steel);
  line-height: 1.75;
  max-width: 50ch;
  margin-bottom: 2rem;
}

.hero__actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.hero__visual {
  display: flex;
  justify-content: flex-end;
  align-items: center;
}

/* 9. Section Headers
   ---------------------------------------------------------- */
.section-header {
  margin-bottom: clamp(2rem, 4vw, 3rem);
}

.section-header--center {
  text-align: center;
}

.section-header--center p {
  margin-inline: auto;
}

.section-header .label {
  display: block;
  margin-bottom: 0.6rem;
}

.section-header h2 {
  margin-bottom: 0.75rem;
}

/* 10. Cards
    ---------------------------------------------------------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.card-grid--3 {
  grid-template-columns: repeat(3, 1fr);
}

.card-grid--2 {
  grid-template-columns: repeat(2, 1fr);
}

.card {
  background: var(--white);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: box-shadow var(--trans), border-color var(--trans), transform var(--trans);
}

.card:hover {
  box-shadow: var(--shadow);
  border-color: var(--blue-rule);
  transform: translateY(-2px);
}

.card__icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background: var(--blue-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.1rem;
}

.card__icon svg {
  width: 20px;
  height: 20px;
}

.card h3 {
  margin-bottom: 0.5rem;
  font-size: 1.05rem;
}

.card p {
  font-size: 0.875rem;
  color: var(--steel);
  line-height: 1.65;
  max-width: none;
}

/* Service card tags */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 1.25rem;
}

.tag {
  display: inline-block;
  padding: 0.2em 0.65em;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 100px;
  font-size: 0.72rem;
  color: var(--steel);
  font-weight: 500;
}

/* 11. Stats
    ---------------------------------------------------------- */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 2rem;
  padding: 2.5rem 2.75rem;
  background: var(--white);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.stat__num {
  font-size: 2.1rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--blue);
  line-height: 1;
  margin-bottom: 0.3rem;
}

.stat p {
  font-size: 0.82rem;
  color: var(--steel);
  max-width: none;
}

/* 12. Principles
    ---------------------------------------------------------- */
.principles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2.25rem;
}

.principle {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.principle__num {
  flex-shrink: 0;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 1.5px solid var(--blue-rule);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--blue);
  margin-top: 0.1rem;
  font-variant-numeric: tabular-nums;
}

.principle__body h3 {
  font-size: 0.95rem;
  margin-bottom: 0.35rem;
}

.principle__body p {
  font-size: 0.85rem;
  color: var(--steel);
  max-width: none;
}

/* 13. Timeline
    ---------------------------------------------------------- */
.timeline {
  position: relative;
  padding-left: 2rem;
  max-width: 720px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 1.5px;
  background: var(--rule);
}

.timeline-item {
  position: relative;
  padding-bottom: 2.25rem;
}

.timeline-item:last-child { padding-bottom: 0; }

.timeline-item::before {
  content: '';
  position: absolute;
  left: -2.37rem;
  top: 0.5rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--blue);
  border: 2.5px solid var(--white);
  outline: 2px solid var(--blue-rule);
}

.timeline-year {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--blue);
  text-transform: uppercase;
  margin-bottom: 0.3rem;
}

.timeline-item h3 {
  font-size: 0.975rem;
  margin-bottom: 0.3rem;
}

.timeline-item p {
  font-size: 0.86rem;
  color: var(--steel);
  max-width: 58ch;
}

/* 14. Infrastructure Sections
    ---------------------------------------------------------- */
.infra-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  padding-block: clamp(2.5rem, 5vw, 4rem);
  border-bottom: 1px solid var(--rule);
}

.infra-pair:last-child { border-bottom: none; }

.infra-pair--rev { direction: rtl; }
.infra-pair--rev > * { direction: ltr; }

.infra-content h2 {
  margin-bottom: 0.75rem;
  font-size: clamp(1.25rem, 2vw, 1.6rem);
}

.infra-content p {
  font-size: 0.925rem;
  color: var(--steel);
  margin-bottom: 1.25rem;
}

.infra-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.infra-list li {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  font-size: 0.875rem;
  color: var(--ink-mid);
}

.infra-list li::before {
  content: '';
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--blue);
  flex-shrink: 0;
  margin-top: 0.55rem;
}

/* 15. Contact
    ---------------------------------------------------------- */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.7fr;
  gap: 5rem;
  align-items: start;
}

.contact-info h2 {
  margin-bottom: 0.75rem;
}

.contact-info > p {
  font-size: 0.925rem;
  color: var(--steel);
  margin-bottom: 2.5rem;
  max-width: 38ch;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.contact-detail {
  display: flex;
  gap: 0.85rem;
  align-items: flex-start;
}

.icon-box {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--blue-light);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.icon-box svg {
  width: 16px;
  height: 16px;
  color: var(--blue);
}

.contact-detail h4 {
  font-size: 0.7rem;
  color: var(--steel);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
  margin-bottom: 0.2rem;
}

.contact-detail p {
  font-size: 0.875rem;
  color: var(--ink-mid);
  max-width: none;
  margin: 0;
}

.form-card {
  background: var(--white);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  box-shadow: var(--shadow);
}

.form-card h3 {
  font-size: 1rem;
  margin-bottom: 1.5rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.form-group label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--ink-mid);
}

.form-group input,
.form-group select,
.form-group textarea {
  font-family: inherit;
  font-size: 0.9rem;
  color: var(--ink);
  background: var(--white);
  border: 1.5px solid var(--rule);
  border-radius: var(--radius-sm);
  padding: 0.6em 0.85em;
  transition: border-color var(--trans), box-shadow var(--trans);
  width: 100%;
  -webkit-appearance: none;
  appearance: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(26,80,204,0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 110px;
  line-height: 1.55;
}

.form-group select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='7' viewBox='0 0 12 7'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%235a6e82' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.85em center;
  padding-right: 2.4em;
  cursor: pointer;
}

.form-notice {
  font-size: 0.76rem;
  color: var(--steel);
  margin-top: 0.6rem;
}

/* 16. 404
    ---------------------------------------------------------- */
.error-page {
  min-height: calc(100vh - var(--nav-h) - 220px);
  display: flex;
  align-items: center;
  padding-block: 5rem;
}

.error-code {
  font-size: clamp(5rem, 18vw, 9rem);
  font-weight: 800;
  letter-spacing: -0.07em;
  color: var(--surface-mid);
  line-height: 1;
  display: block;
  margin-bottom: 0.5rem;
}

/* 17. Highlight Band
    ---------------------------------------------------------- */
.highlight-band {
  background: var(--blue);
  padding-block: clamp(3rem, 6vw, 5rem);
}

.highlight-band h2 { color: var(--white); }
.highlight-band p  { color: rgba(255,255,255,0.72); }

/* 18. Visual / SVG frames
    ---------------------------------------------------------- */
.visual-frame {
  width: 100%;
  max-width: 480px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--rule);
  padding: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.visual-frame svg {
  width: 100%;
  height: auto;
}

/* 19. Responsive
    ---------------------------------------------------------- */
@media (max-width: 900px) {
  .hero__inner { grid-template-columns: 1fr; gap: 0; }
  .hero__visual { display: none; }

  .infra-pair,
  .infra-pair--rev {
    grid-template-columns: 1fr;
    direction: ltr;
    gap: 2rem;
  }

  .contact-layout {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .footer-brand { grid-column: 1 / -1; }

  .card-grid--3 { grid-template-columns: repeat(2, 1fr); }
  .card-grid--2 { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--rule);
    flex-direction: column;
    align-items: flex-start;
    padding: 1rem var(--container-pad) 1.5rem;
    gap: 0.15rem;
    box-shadow: var(--shadow);
  }

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

  .nav-links a { width: 100%; }

  .nav-links .nav-cta {
    margin-left: 0;
    margin-top: 0.5rem;
    width: fit-content;
  }

  .nav-toggle { display: flex; }

  .form-row { grid-template-columns: 1fr; }

  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }

  .card-grid--3,
  .card-grid--2 { grid-template-columns: 1fr; }

  .stats-row { grid-template-columns: 1fr 1fr; }
}

.page-header {
  padding-block: clamp(3rem, 7vw, 5rem);
}

.stats-row--plain .stat__num {
  font-size: 1.1rem;
  letter-spacing: 0;
}

.feature-split {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 4rem;
  align-items: center;
}

.surface-panel {
  background: var(--white);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.surface-panel--dark {
  background: rgba(255,255,255,0.06);
  border-color: rgba(255,255,255,0.12);
}

.surface-panel__row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--rule);
  font-size: 0.92rem;
  color: var(--ink-mid);
}

.surface-panel--dark .surface-panel__row {
  border-bottom-color: rgba(255,255,255,0.12);
  color: rgba(255,255,255,0.82);
}

.surface-panel__row:last-child {
  border-bottom: none;
}

.cta-row {
  display:flex;
  align-items:center;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:2rem;
}

.two-col-copy {
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:4rem;
  align-items:start;
}

.code-block {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--ink-mid);
  overflow-x: auto;
  white-space: pre-wrap;
  margin-bottom: 1.25rem;
}

@media (max-width: 900px) {
  .feature-split,
  .two-col-copy {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}