/* ==========================================================================
   Tensor Systems — "Engineered Editorial"
   ========================================================================== */

:root {
  /* Core brand */
  --navy-950: #0A1633;
  --navy-800: #14245C;
  --blue-600: #1B7FD4;
  --blue-500: #2E93EA;

  /* Neutrals */
  --paper:    #F7F9FC;
  --surface:  #FFFFFF;
  --ink-700:  #33415C;
  --ink-400:  #7C8AA5;
  --line:     #DCE4F0;

  /* Sharp accent — used sparingly */
  --signal:      #FF8A3D;
  --signal-deep: #F0762A;

  /* Dark sections */
  --dark-bg:          #0A1633;
  --dark-surface:     #122048;
  --dark-text:        #E8EEF9;
  --dark-muted:       #8FA0C6;
  --dark-line:        rgba(232, 238, 249, 0.12);
  --dark-line-strong: rgba(232, 238, 249, 0.28);

  /* Type */
  --font-display: "Archivo", sans-serif;
  --font-body: "Instrument Sans", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;

  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --container: 1200px;
}

/* ---------- Reset & base ---------- */

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--ink-700);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--font-display);
  color: var(--navy-800);
  line-height: 1.12;
  margin: 0 0 1rem;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

p { margin: 0 0 1rem; }

a { color: var(--blue-600); }

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

.container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 4vw, 2.5rem);
}

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  margin: -1px; padding: 0; border: 0;
  clip: rect(0 0 0 0); overflow: hidden; white-space: nowrap;
}

.skip-link {
  position: absolute; left: 1rem; top: -4rem; z-index: 100;
  background: var(--navy-800); color: #fff;
  padding: 0.6rem 1rem; font-family: var(--font-mono); font-size: 0.8rem;
  transition: top 0.2s var(--ease-out);
}
.skip-link:focus { top: 1rem; }

:focus-visible {
  outline: 2px solid var(--blue-600);
  outline-offset: 3px;
}

::selection { background: var(--blue-600); color: #fff; }

/* ---------- Shared type patterns ---------- */

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--blue-600);
  margin: 0 0 1rem;
}

.eyebrow-dark { color: var(--blue-500); }

.section-num { color: var(--ink-400); }

.lede, .section-lede {
  font-size: 1.125rem;
  max-width: 34em;
  color: var(--ink-700);
}

.svg-annot {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.1em;
}

.svg-stat {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
}

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

.btn {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  padding: 0.8rem 1.6rem;
  border: 1px solid transparent;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.2s var(--ease-out),
              border-color 0.2s var(--ease-out),
              color 0.2s var(--ease-out),
              transform 0.2s var(--ease-out);
}
.btn:active { transform: translateY(1px); }

.btn-signal {
  background: var(--signal);
  color: var(--navy-950);
}
.btn-signal:hover { background: var(--signal-deep); }

.btn-ghost {
  border-color: var(--navy-800);
  color: var(--navy-800);
  background: transparent;
}
.btn-ghost:hover {
  border-color: var(--blue-600);
  color: var(--blue-600);
}

.btn-outline-light {
  border-color: var(--dark-line-strong);
  color: var(--dark-text);
  background: transparent;
}
.btn-outline-light:hover {
  border-color: var(--blue-500);
  color: var(--blue-500);
}

.btn-wide { width: 100%; }

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease-out);
}
.site-header.is-scrolled { border-bottom-color: var(--line); }

.header-inner {
  max-width: var(--container);
  margin-inline: auto;
  padding: 0.9rem clamp(1.25rem, 4vw, 2.5rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--blue-600);
}

.brand-mark { width: 34px; height: 34px; }

.brand-word {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.05rem;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--navy-800);
}
.brand-word span { font-weight: 600; }

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-menu > li > a:not(.btn) {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--navy-800);
  text-decoration: none;
  padding-block: 0.4rem;
  background-image: linear-gradient(var(--blue-600), var(--blue-600));
  background-repeat: no-repeat;
  background-size: 0% 1.5px;
  background-position: left calc(100% - 0.15rem);
  transition: background-size 0.25s var(--ease-out), color 0.2s var(--ease-out);
}
.nav-menu > li > a:not(.btn):hover {
  color: var(--blue-600);
  background-size: 100% 1.5px;
}

.nav-toggle { display: none; }

/* Mobile nav */
@media (max-width: 860px) {
  .nav-toggle {
    display: grid;
    place-items: center;
    width: 44px; height: 44px;
    background: none;
    border: 1px solid var(--line);
    border-radius: 4px;
    cursor: pointer;
  }
  .nav-toggle-box {
    display: grid; gap: 6px; width: 18px;
  }
  .nav-toggle-box span {
    height: 2px; background: var(--navy-800);
    transition: transform 0.25s var(--ease-out);
  }
  .nav-toggle[aria-expanded="true"] .nav-toggle-box span:first-child {
    transform: translateY(4px) rotate(45deg);
  }
  .nav-toggle[aria-expanded="true"] .nav-toggle-box span:last-child {
    transform: translateY(-4px) rotate(-45deg);
  }

  .nav-menu {
    position: absolute;
    top: 100%; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--line);
    padding: 0.5rem 1.25rem 1.25rem;
    display: none;
  }
  .nav-menu.is-open { display: flex; }
  .nav-menu > li > a:not(.btn) {
    display: block;
    padding: 0.85rem 0.25rem;
    border-bottom: 1px solid var(--line);
    background-image: none;
  }
  .nav-cta-item { padding-top: 1rem; }
  .nav-cta-item .btn { display: block; text-align: center; }
}

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

.hero {
  position: relative;
  overflow: hidden;
  background-image:
    repeating-linear-gradient(60deg,
      color-mix(in srgb, var(--navy-800) 4%, transparent) 0 1px, transparent 1px 56px),
    repeating-linear-gradient(-60deg,
      color-mix(in srgb, var(--navy-800) 4%, transparent) 0 1px, transparent 1px 56px);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 6.5fr) minmax(0, 5.5fr);
  align-items: center;
  gap: clamp(2rem, 5vw, 4rem);
  padding-block: clamp(3.5rem, 9vh, 7rem);
}

.hero h1 {
  font-size: clamp(2.75rem, 6vw, 4.5rem);
  font-weight: 800;
  font-stretch: 112%;
  text-transform: uppercase;
  letter-spacing: -0.015em;
  line-height: 1.04;
  color: var(--navy-950);
}
.hero h1 em {
  font-style: normal;
  color: var(--blue-600);
}

.hero .lede { margin-bottom: 2rem; }

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-bottom: 2.25rem;
}

.hero-meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-400);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0;
}
.meta-dot {
  width: 7px; height: 7px;
  background: var(--signal);
  border-radius: 50%;
  animation: pulse-dot 2.6s ease-in-out infinite;
}

.hero-visual {
  /* deliberately breaks the container edge on wide screens */
  margin-right: clamp(-3rem, -2vw, 0rem);
}

.hero-illustration { width: 100%; height: auto; }

/* Hero load choreography */
.hero-anim {
  opacity: 0;
  transform: translateY(18px);
  animation: rise-in 0.55s var(--ease-out) forwards;
  animation-delay: calc(var(--i, 0) * 80ms + 100ms);
}

@keyframes rise-in {
  to { opacity: 1; transform: none; }
}

@keyframes pulse-dot {
  0%, 100% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--signal) 45%, transparent); }
  55%      { box-shadow: 0 0 0 7px transparent; }
}

/* Ambient motion inside the hero illustration */
.cube-float { animation: floaty 7s ease-in-out infinite; }
.cube-float-b { animation-delay: -2.4s; }
.cube-float-c { animation-delay: -4.6s; }

@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-9px); }
}

.node { animation: node-pulse 3.2s ease-in-out infinite; transform-box: fill-box; transform-origin: center; }
.node-2 { animation-delay: -1.1s; }
.node-3 { animation-delay: -2.2s; }

@keyframes node-pulse {
  0%, 100% { opacity: 0.55; transform: scale(1); }
  50%      { opacity: 1;    transform: scale(1.35); }
}

/* ---------- Sections (shared) ---------- */

.section { padding-block: clamp(4rem, 9vh, 6.5rem); }

.section:not(.section-dark) .container > .section-head,
.section .section-head {
  border-top: 1px solid var(--line);
  padding-top: 2rem;
  margin-bottom: 3rem;
}
.section-dark .section-head { border-top-color: var(--dark-line); }

.section h2 { font-size: clamp(1.75rem, 3.2vw, 2.25rem); font-weight: 700; }

.section-tint {
  background:
    repeating-linear-gradient(60deg,
      color-mix(in srgb, var(--navy-800) 3%, transparent) 0 1px, transparent 1px 56px),
    var(--surface);
  border-block: 1px solid var(--line);
}

/* Scroll reveals */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
  transition-delay: calc(var(--d, 0) * 90ms);
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- Services ---------- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

@media (max-width: 1080px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 620px) {
  .card-grid { grid-template-columns: 1fr; }
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1.6rem 1.4rem;
  transition: transform 0.25s var(--ease-out),
              border-color 0.25s var(--ease-out),
              box-shadow 0.25s var(--ease-out);
}
.card:hover {
  transform: translateY(-2px);
  border-color: var(--blue-600);
  box-shadow: 0 10px 28px -14px color-mix(in srgb, var(--navy-800) 30%, transparent);
}

.card-icon {
  width: 52px; height: 52px;
  color: var(--blue-600);
  margin-bottom: 1.25rem;
}

.card h3 { font-size: 1.25rem; font-weight: 700; margin-bottom: 0.6rem; }
.card p { margin: 0; font-size: 0.98rem; }

/* ---------- TensorShift dark band ---------- */

.section-dark {
  background: linear-gradient(180deg, var(--navy-950), var(--navy-800) 160%);
  color: var(--dark-text);
}
.section-dark h2 { color: var(--dark-text); }
.section-dark .section-lede { color: var(--dark-muted); }

.ts-grid {
  display: grid;
  grid-template-columns: minmax(0, 5.5fr) minmax(0, 6.5fr);
  gap: clamp(2.5rem, 5vw, 4.5rem);
  align-items: center;
}

.feature-list {
  list-style: none;
  margin: 0 0 2.25rem;
  padding: 0;
  display: grid;
  gap: 1.1rem;
}
.feature-list li {
  padding-left: 1.4rem;
  position: relative;
  color: var(--dark-muted);
  font-size: 0.98rem;
}
.feature-list li::before {
  content: "";
  position: absolute;
  left: 0; top: 0.42em;
  width: 8px; height: 8px;
  border: 1.5px solid var(--blue-500);
  transform: rotate(45deg);
}
.feature-list strong {
  display: block;
  color: var(--dark-text);
  font-weight: 600;
  margin-bottom: 0.1rem;
}

.ts-illustration {
  width: 100%; height: auto;
  filter: drop-shadow(0 24px 48px rgba(0, 0, 0, 0.35));
}

.section-dark .reveal.is-visible .bar {
  transform-box: fill-box;
  transform-origin: bottom;
  animation: bar-grow 0.7s var(--ease-out) backwards;
}
.section-dark .reveal.is-visible .bar-2 { animation-delay: 0.06s; }
.section-dark .reveal.is-visible .bar-3 { animation-delay: 0.12s; }
.section-dark .reveal.is-visible .bar-4 { animation-delay: 0.18s; }
.section-dark .reveal.is-visible .bar-5 { animation-delay: 0.24s; }
.section-dark .reveal.is-visible .bar-6 { animation-delay: 0.30s; }
.section-dark .reveal.is-visible .bar-7 { animation-delay: 0.36s; }

@keyframes bar-grow {
  from { transform: scaleY(0); }
}

/* ---------- Process timeline ---------- */

.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  position: relative;
}
.timeline::before {
  content: "";
  position: absolute;
  top: 5px;
  left: 6px; right: 6px;
  height: 1px;
  background: var(--line);
}

.timeline-step { position: relative; padding-top: 1.9rem; }

.timeline-node {
  position: absolute;
  top: 0; left: 0;
  width: 11px; height: 11px;
  background: var(--paper);
  border: 2px solid var(--blue-600);
  border-radius: 50%;
}
.timeline-step:first-child .timeline-node {
  background: var(--signal);
  border-color: var(--signal);
}

.timeline-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--ink-400);
  display: block;
  margin-bottom: 0.4rem;
}

.timeline-step h3 { font-size: 1.15rem; margin-bottom: 0.5rem; }
.timeline-step p { margin: 0; font-size: 0.95rem; }

/* ---------- About ---------- */

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}
.about-grid .section-head { margin-bottom: 0; }
.about-body { padding-top: 2rem; }
.about-body p { max-width: 38em; }

/* ---------- Contact ---------- */

.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: start;
}
.contact-grid .section-head { margin-bottom: 0; }

.contact-direct {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  margin-top: 1.5rem;
}
.contact-direct a { color: var(--blue-600); }

.contact-form {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: clamp(1.5rem, 3vw, 2.25rem);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.1rem;
}

.field { margin-bottom: 1.1rem; }

.field label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--navy-800);
  margin-bottom: 0.45rem;
}
.field .optional { color: var(--ink-400); text-transform: none; letter-spacing: 0; }

.field input,
.field textarea {
  width: 100%;
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--ink-700);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 0.7rem 0.85rem;
  transition: border-color 0.2s var(--ease-out), background-color 0.2s var(--ease-out);
}
.field textarea { resize: vertical; }

.field input:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--blue-600);
  background: var(--surface);
}

.field.has-error input,
.field.has-error textarea { border-color: var(--signal-deep); }

.field-error {
  font-size: 0.82rem;
  color: var(--signal-deep);
  margin: 0.35rem 0 0;
}

.form-success {
  margin: 1.1rem 0 0;
  padding: 0.85rem 1rem;
  border: 1px solid var(--blue-600);
  border-radius: 4px;
  background: color-mix(in srgb, var(--blue-600) 8%, transparent);
  color: var(--navy-800);
  font-size: 0.95rem;
}

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

.site-footer {
  position: relative;
  overflow: hidden;
  background: var(--navy-950);
  color: var(--dark-muted);
  padding-block: 3.5rem 2rem;
}

.footer-watermark {
  position: absolute;
  right: -60px; bottom: -80px;
  width: 380px; height: 380px;
  color: var(--dark-text);
  opacity: 0.05;
  pointer-events: none;
}

.footer-inner {
  position: relative;
  display: grid;
  grid-template-columns: 2fr 1fr 1.4fr;
  gap: 2.5rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--dark-line);
}

.brand-mark-light { color: var(--blue-500); width: 40px; height: 40px; margin-bottom: 0.9rem; }

.footer-word {
  font-family: var(--font-display);
  font-weight: 800;
  text-transform: uppercase;
  color: var(--dark-text);
  margin-bottom: 0.25rem;
}
.footer-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  margin: 0;
}

.footer-nav ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.55rem; }
.footer-nav a,
.footer-contact a {
  color: var(--dark-muted);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.2s var(--ease-out);
}
.footer-nav a:hover,
.footer-contact a:hover { color: var(--blue-500); }

.footer-contact a { font-family: var(--font-mono); font-size: 0.85rem; }

.footer-legal {
  position: relative;
  padding-top: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
}
.footer-legal p { margin: 0; }

/* ---------- Responsive ---------- */

@media (max-width: 980px) {
  .hero-grid,
  .ts-grid,
  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .hero-visual { margin-right: 0; max-width: 480px; }
  .ts-visual { max-width: 560px; }
  .timeline { grid-template-columns: 1fr; gap: 2.25rem; }
  .timeline::before {
    top: 6px; bottom: 6px; left: 5px;
    width: 1px; height: auto; right: auto;
  }
  .timeline-step { padding-top: 0; padding-left: 2rem; }
  .about-body { padding-top: 0; }
  .footer-inner { grid-template-columns: 1fr; gap: 2rem; }
}

@media (max-width: 480px) {
  .form-row { grid-template-columns: 1fr; }
  .hero-ctas .btn { width: 100%; text-align: center; }
}

/* ---------- Reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-anim,
  .reveal {
    animation: none;
    transition: none;
    opacity: 1;
    transform: none;
  }
  .cube-float,
  .node,
  .meta-dot,
  .section-dark .reveal.is-visible .bar {
    animation: none;
  }
  * { transition-duration: 0.01ms !important; }
}