:root {
  --bg: #07111f;
  --bg-deep: #030813;
  --surface: rgba(10, 21, 38, 0.84);
  --surface-strong: rgba(15, 28, 49, 0.96);
  --surface-soft: rgba(14, 23, 37, 0.72);
  --ink: #e8f1ff;
  --muted: #9db0cf;
  --line: rgba(157, 176, 207, 0.16);
  --accent: #53c5ff;
  --accent-strong: #1388ff;
  --accent-alt: #71ffd1;
  --glow: rgba(19, 136, 255, 0.3);
  --danger: #ff7a6b;
  --shadow: 0 30px 80px rgba(0, 0, 0, 0.45);
  --radius-lg: 30px;
  --radius-md: 22px;
  --radius-sm: 14px;
  --max-width: 1200px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: "IBM Plex Sans", sans-serif;
  background:
    radial-gradient(circle at 15% 20%, rgba(83, 197, 255, 0.18), transparent 24%),
    radial-gradient(circle at 82% 18%, rgba(113, 255, 209, 0.11), transparent 18%),
    radial-gradient(circle at 70% 78%, rgba(19, 136, 255, 0.14), transparent 22%),
    linear-gradient(180deg, #07111f 0%, #050c17 48%, #030813 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(135, 170, 226, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(135, 170, 226, 0.05) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.7), transparent 92%);
}

.page-glow {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 20% 10%, rgba(83, 197, 255, 0.12), transparent 25%),
    radial-gradient(circle at 80% 20%, rgba(113, 255, 209, 0.08), transparent 22%);
  filter: blur(24px);
}

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

.site-header,
.hero,
.section,
.site-footer {
  position: relative;
  z-index: 1;
  width: min(calc(100% - 2rem), var(--max-width));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1rem;
  padding: 1rem 1.4rem;
  border: 1px solid rgba(157, 176, 207, 0.12);
  border-radius: 999px;
  background: rgba(4, 10, 20, 0.72);
  backdrop-filter: blur(18px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.24);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 2.45rem;
  height: 2.45rem;
  border-radius: 50%;
  color: #03111e;
  background: linear-gradient(135deg, var(--accent-alt), var(--accent));
  box-shadow: 0 0 30px rgba(83, 197, 255, 0.35);
}

.site-nav {
  display: flex;
  gap: 1.25rem;
  color: var(--muted);
}

.site-header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.site-nav a {
  transition: color 180ms ease;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--ink);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  gap: 2rem;
  align-items: start;
  padding: 5rem 0 3.75rem;
}

.hero-visual {
  align-self: start;
  padding-top: 5.4rem;
}

.eyebrow,
.panel-label,
.contact-label,
.code-title {
  margin: 0 0 1rem;
  color: var(--accent-alt);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1,
h2,
h3,
.brand-text {
  font-family: "Space Grotesk", sans-serif;
}

h1 {
  margin: 0;
  max-width: 11ch;
  font-size: clamp(3.2rem, 7vw, 6.4rem);
  line-height: 0.95;
}

h2 {
  margin: 0;
  max-width: 15ch;
  font-size: clamp(2.2rem, 4.8vw, 3.7rem);
  line-height: 1;
}

h3 {
  margin: 0 0 0.75rem;
  font-size: 1.28rem;
}

.hero-text,
.feature-card p,
.workflow-step p,
.hybrid-panel p,
.analysis-card p,
.contact-copy p,
.contact-note,
.hero-metrics span,
.solver-card span,
.site-footer p,
pre {
  color: var(--muted);
  line-height: 1.75;
}

.hero-text {
  max-width: 62ch;
  margin: 1.5rem 0 0;
  font-size: 1.05rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 2rem 0;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3.25rem;
  padding: 0.95rem 1.45rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 600;
  transition:
    transform 180ms ease,
    box-shadow 180ms ease,
    border-color 180ms ease,
    background 180ms ease;
}

.button-small {
  min-height: 2.75rem;
  padding: 0.7rem 1rem;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-2px);
}

.button-primary {
  color: #021019;
  background: linear-gradient(135deg, var(--accent-alt), var(--accent));
  box-shadow: 0 16px 36px rgba(83, 197, 255, 0.28);
}

.button-secondary {
  border-color: rgba(157, 176, 207, 0.18);
  background: rgba(15, 28, 49, 0.64);
  color: var(--ink);
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  padding: 0;
  margin: 2.4rem 0 0;
  list-style: none;
}

.hero-metrics li,
.feature-card,
.workflow-step,
.hybrid-panel,
.analysis-card,
.contact-card,
.console-shell,
.auth-card,
.auth-shell {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(12, 24, 43, 0.84), rgba(8, 17, 31, 0.92));
  box-shadow: var(--shadow);
}

.hero-metrics li {
  padding: 1.3rem;
}

.hero-metrics strong {
  display: block;
  margin-bottom: 0.4rem;
  font-family: "Space Grotesk", sans-serif;
  font-size: 1rem;
}

.console-shell {
  padding: 1rem;
  overflow: hidden;
  width: 100%;
  margin-top: 0;
}

.console-topbar {
  display: flex;
  gap: 0.45rem;
  margin-bottom: 1rem;
}

.console-topbar span {
  width: 0.78rem;
  height: 0.78rem;
  border-radius: 50%;
  background: rgba(157, 176, 207, 0.35);
}

.solver-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.solver-card {
  min-height: 180px;
  padding: 1.3rem;
  border-radius: 20px;
  background:
    linear-gradient(180deg, rgba(9, 17, 30, 0.95), rgba(13, 26, 45, 0.94));
  border: 1px solid rgba(157, 176, 207, 0.14);
}

.solver-card p {
  margin: 0 0 0.45rem;
  color: var(--accent);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.solver-card strong {
  display: block;
  margin-bottom: 0.5rem;
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.45rem;
}

.solver-card-emphasis {
  background:
    linear-gradient(135deg, rgba(19, 136, 255, 0.28), rgba(9, 17, 30, 0.92)),
    linear-gradient(180deg, rgba(9, 17, 30, 0.98), rgba(13, 26, 45, 0.96));
}

.solver-card-wide {
  grid-column: span 2;
}

.cad-preview {
  position: relative;
  height: 110px;
  margin: 1rem 0;
  overflow: hidden;
  border: 1px solid rgba(83, 197, 255, 0.12);
  border-radius: 16px;
  background:
    radial-gradient(circle at 20% 20%, rgba(83, 197, 255, 0.08), transparent 30%),
    linear-gradient(180deg, rgba(7, 14, 25, 0.92), rgba(4, 10, 18, 0.96));
}

.cad-grid,
.cad-waveguide,
.cad-waveguide-face,
.cad-hub,
.cad-hub-top,
.cad-plate,
.cad-plate-top,
.cad-plate-axis,
.cad-bolt {
  position: absolute;
  display: block;
}

.cad-grid {
  inset: 0;
  background-image:
    linear-gradient(rgba(83, 197, 255, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(83, 197, 255, 0.08) 1px, transparent 1px);
  background-size: 18px 18px;
}

.cad-waveguide,
.cad-hub {
  background: linear-gradient(180deg, rgba(138, 147, 166, 0.9), rgba(90, 102, 122, 0.92));
  border: 1px solid rgba(212, 224, 255, 0.22);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.08),
    0 10px 20px rgba(0, 0, 0, 0.22);
}

.cad-waveguide-left,
.cad-waveguide-right {
  top: 44px;
  width: 108px;
  height: 42px;
}

.cad-waveguide-left {
  left: 20px;
}

.cad-waveguide-right {
  right: 20px;
}

.cad-waveguide-top {
  top: 8px;
  left: 50%;
  width: 42px;
  height: 62px;
  transform: translateX(-50%);
}

.cad-waveguide-face,
.cad-plate-axis,
.cad-bolt {
  border: 1px solid rgba(212, 224, 255, 0.2);
}

.cad-waveguide-face {
  background: linear-gradient(180deg, rgba(114, 123, 143, 0.98), rgba(85, 95, 112, 0.98));
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.04);
}

.cad-waveguide-face-left,
.cad-waveguide-face-right {
  top: 38px;
  width: 18px;
  height: 54px;
}

.cad-waveguide-face-left {
  left: 10px;
}

.cad-waveguide-face-right {
  right: 10px;
}

.cad-waveguide-face-top {
  top: 2px;
  left: calc(50% - 12px);
  width: 24px;
  height: 18px;
}

.cad-hub {
  top: 34px;
  left: 50%;
  width: 134px;
  height: 56px;
  border-radius: 16px;
  transform: translateX(-50%);
}

.cad-hub-top {
  top: 28px;
  left: 50%;
  width: 106px;
  height: 34px;
  border-radius: 14px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, rgba(184, 191, 205, 0.72), rgba(120, 132, 154, 0.88));
  border: 1px solid rgba(230, 235, 255, 0.16);
}

.cad-plate,
.cad-plate-top {
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.18);
}

.cad-plate {
  top: 18px;
  left: calc(50% + 14px);
  width: 74px;
  height: 44px;
  border-radius: 12px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, rgba(174, 139, 76, 0.92), rgba(140, 104, 41, 0.96));
  border: 1px solid rgba(255, 224, 157, 0.24);
}

.cad-plate-top {
  top: 12px;
  left: calc(50% + 16px);
  width: 58px;
  height: 20px;
  border-radius: 999px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, rgba(223, 192, 132, 0.96), rgba(183, 143, 76, 0.96));
  border: 1px solid rgba(255, 233, 180, 0.26);
}

.cad-plate-axis {
  top: 6px;
  left: calc(50% + 16px);
  width: 8px;
  height: 16px;
  border-radius: 4px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, rgba(144, 187, 92, 0.95), rgba(92, 128, 54, 0.95));
}

.cad-bolt {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: rgba(217, 224, 240, 0.72);
  box-shadow: 0 0 10px rgba(255, 255, 255, 0.08);
}

.cad-bolt-a {
  top: 31px;
  left: calc(50% - 42px);
}

.cad-bolt-b {
  top: 31px;
  left: calc(50% - 5px);
}

.cad-bolt-c {
  top: 58px;
  right: calc(50% - 39px);
}

.section {
  padding: 2rem 0 4rem;
  scroll-margin-top: 7rem;
}

.manual-main {
  width: min(calc(100% - 2rem), 1320px);
  margin: 0 auto;
  padding: 4rem 0 4.5rem;
}

.manual-header {
  max-width: 920px;
  margin-bottom: 2rem;
}

.manual-header h1 {
  max-width: 15ch;
  font-size: clamp(2.8rem, 5vw, 4.8rem);
}

.manual-intro,
.manual-paragraph,
.manual-subsection p,
.manual-table,
.manual-list,
.manual-note {
  color: var(--muted);
  line-height: 1.8;
}

.manual-layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 1.5rem;
  align-items: start;
}

.manual-toc {
  position: sticky;
  top: 6.6rem;
  padding: 1.25rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(8, 17, 31, 0.82);
  box-shadow: var(--shadow);
}

.manual-toc nav {
  display: grid;
  gap: 0.7rem;
}

.manual-toc a {
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.45;
  transition: color 180ms ease;
}

.manual-toc a:hover,
.manual-toc a:focus-visible {
  color: var(--ink);
}

.manual-content {
  display: grid;
  gap: 1.25rem;
}

.manual-section {
  padding: 1.5rem 1.6rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(9, 18, 32, 0.96), rgba(7, 14, 25, 0.98));
  box-shadow: var(--shadow);
  scroll-margin-top: 7rem;
}

.manual-section-heading {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
  margin-bottom: 1rem;
}

.manual-section-heading h2 {
  max-width: none;
  margin-bottom: 0.55rem;
  font-size: clamp(1.6rem, 2.6vw, 2.35rem);
}

.manual-section-heading p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}

.manual-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  min-height: 72px;
  border: 1px solid rgba(83, 197, 255, 0.18);
  border-radius: 18px;
  color: var(--accent-alt);
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.3rem;
  font-weight: 700;
  background: rgba(10, 21, 38, 0.8);
}

.manual-note {
  margin: 1rem 0;
  padding: 1rem 1.1rem;
  border-left: 3px solid var(--accent);
  border-radius: 0 14px 14px 0;
  background: rgba(12, 25, 43, 0.7);
}

.manual-note strong {
  color: var(--ink);
}

.manual-table {
  width: 100%;
  margin-top: 1rem;
  border-collapse: collapse;
  font-size: 0.96rem;
}

.manual-table th,
.manual-table td {
  padding: 0.95rem 0.85rem;
  border: 1px solid rgba(157, 176, 207, 0.14);
  text-align: left;
  vertical-align: top;
}

.manual-table th {
  color: var(--ink);
  font-weight: 600;
  background: rgba(15, 28, 49, 0.88);
}

.manual-table td {
  background: rgba(8, 17, 31, 0.45);
}

.manual-subsection + .manual-subsection {
  margin-top: 1.2rem;
}

.manual-subsection h3 {
  margin-bottom: 0.5rem;
}

.manual-list {
  margin: 0.7rem 0 0;
  padding-left: 1.3rem;
}

.manual-list-numbered {
  padding-left: 1.45rem;
}

.manual-list li + li {
  margin-top: 0.45rem;
}

.manual-diagram {
  display: grid;
  gap: 0.9rem;
  margin-top: 1rem;
  padding: 1.2rem;
  border: 1px solid rgba(83, 197, 255, 0.14);
  border-radius: 18px;
  background: rgba(8, 17, 31, 0.68);
}

.manual-diagram-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
}

.manual-diagram-row span,
.manual-diagram-arrow {
  padding: 0.85rem 0.95rem;
  border: 1px solid rgba(157, 176, 207, 0.14);
  border-radius: 14px;
  color: var(--ink);
  background: rgba(12, 24, 43, 0.8);
}

.manual-diagram-arrow {
  text-align: center;
  color: var(--accent-alt);
  font-weight: 600;
}

.auth-main {
  width: min(calc(100% - 2rem), var(--max-width));
  margin: 0 auto;
  padding: 5rem 0 4rem;
}

.auth-shell {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  gap: 1.5rem;
  align-items: stretch;
  padding: 1.5rem;
}

.auth-copy,
.auth-card {
  min-width: 0;
}

.auth-card {
  padding: 1.5rem;
}

.auth-form {
  display: grid;
  gap: 0.9rem;
}

.auth-label {
  color: var(--ink);
  font-size: 0.95rem;
  font-weight: 600;
}

.auth-input {
  width: 100%;
  min-height: 3.2rem;
  padding: 0.85rem 1rem;
  border: 1px solid rgba(157, 176, 207, 0.18);
  border-radius: 14px;
  color: var(--ink);
  font: inherit;
  background: rgba(4, 10, 20, 0.78);
}

.auth-input:focus {
  outline: 2px solid rgba(83, 197, 255, 0.35);
  outline-offset: 2px;
}

.auth-submit {
  margin-top: 0.6rem;
}

.auth-note,
.auth-error {
  margin: 1rem 0 0;
  line-height: 1.7;
}

.auth-note {
  color: var(--muted);
}

.auth-error {
  color: #ffb3ad;
}

.section-alt {
  padding: 3rem 0 4rem;
}

.section-heading {
  margin-bottom: 2rem;
}

.feature-grid,
.workflow-grid,
.hybrid-layout,
.analysis-layout,
.contact-section {
  display: grid;
  gap: 1.2rem;
}

.feature-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.feature-card,
.workflow-step,
.hybrid-panel,
.analysis-card,
.contact-card {
  padding: 1.5rem;
}

.workflow-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.step-number {
  display: inline-flex;
  margin-bottom: 1rem;
  color: var(--accent);
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.8rem;
  font-weight: 700;
}

.hybrid-layout {
  grid-template-columns: 1fr 1fr;
}

.hybrid-panel-accent {
  background:
    linear-gradient(135deg, rgba(113, 255, 209, 0.12), rgba(8, 17, 31, 0.96)),
    linear-gradient(180deg, rgba(12, 24, 43, 0.84), rgba(8, 17, 31, 0.92));
}

.analysis-layout {
  grid-template-columns: 1fr 1fr 0.82fr;
  align-items: stretch;
}

.code-card {
  background:
    linear-gradient(180deg, rgba(7, 15, 27, 0.98), rgba(5, 11, 20, 0.98));
  max-width: 420px;
}

pre {
  margin: 0;
  padding: 1rem;
  overflow: auto;
  border: 1px solid rgba(157, 176, 207, 0.12);
  border-radius: var(--radius-sm);
  background: rgba(2, 8, 16, 0.92);
  font-family: "IBM Plex Sans", sans-serif;
  font-size: 0.95rem;
}

.contact-section {
  grid-template-columns: 1.2fr 0.8fr;
  align-items: center;
  padding-bottom: 5rem;
}

.contact-card {
  background:
    linear-gradient(180deg, rgba(15, 28, 49, 0.96), rgba(9, 17, 31, 0.98));
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0 0 2.5rem;
}

.site-footer p {
  margin: 0;
}

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity 700ms ease,
    transform 700ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1100px) {
  .hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 1.5rem;
  }

  .hero-metrics {
    grid-template-columns: 1fr;
  }

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

  .solver-card-wide {
    grid-column: span 1;
  }

  h1 {
    max-width: 12ch;
    font-size: clamp(2.8rem, 8vw, 5rem);
  }
}

@media (max-width: 1280px) {
  .hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 1.75rem;
  }

  .hero-copy {
    max-width: 860px;
  }

  .hero-visual {
    width: 100%;
    padding-top: 0;
  }

  .console-shell {
    margin-top: 0;
  }

  h1 {
    max-width: 11ch;
    font-size: clamp(2.9rem, 7vw, 5.2rem);
  }
}

@media (min-width: 1281px) and (max-width: 1500px) {
  .hero {
    grid-template-columns: minmax(0, 1.08fr) minmax(430px, 0.8fr);
    gap: 3rem;
  }

  h1 {
    font-size: clamp(2.7rem, 5.1vw, 4.8rem);
    max-width: 9ch;
  }

  .solver-grid {
    gap: 0.9rem;
  }

  .solver-card {
    min-width: 0;
    padding: 1.15rem;
  }

  .solver-card strong {
    font-size: 1.2rem;
  }
}

@media (max-width: 1100px) {
  .feature-grid,
  .workflow-grid,
  .hybrid-layout,
  .analysis-layout,
  .contact-section,
  .auth-shell,
  .manual-layout,
  .manual-section-heading,
  .manual-diagram-row {
    grid-template-columns: 1fr;
  }

  .manual-toc {
    position: static;
  }

  .manual-number {
    width: auto;
    min-height: 52px;
  }
}

@media (max-width: 720px) {
  .site-header {
    flex-direction: column;
    gap: 1rem;
    border-radius: 26px;
  }

  .site-nav {
    flex-wrap: wrap;
    justify-content: center;
  }

  .site-header-actions {
    flex-direction: column;
  }

  .hero {
    padding-top: 3rem;
  }

  h1,
  h2 {
    max-width: none;
  }

  .solver-card {
    min-height: 160px;
  }

  .site-footer {
    flex-direction: column;
  }
}

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

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .button,
  .site-nav a {
    transition: none;
  }
}