/* ==========================================================================
   Numeriga — Brand & Static Foundation (Sprint N1)
   main.css — design tokens, base styles, layout primitives
   ========================================================================== */

/* 1. Design tokens
   ------------------------------------------------------------------------ */
:root {
  /* Color — dark-first, aligned to the Numeriga mark
     (deep navy base + strong blue + bright cyan highlights) */
  --color-bg: #060b16;
  --color-bg-deep: #03060d;
  --color-surface: #0a1322;
  --color-surface-soft: #0e1a2e;

  --color-text: #eaf1fb;
  --color-text-muted: #8fa0b8;

  --color-primary: #0084ff;
  --color-primary-strong: #0066cc;
  --color-accent: #00c8ff;

  --color-border: rgba(143, 160, 184, 0.16);
  --color-border-strong: rgba(143, 160, 184, 0.3);

  --gradient-accent: linear-gradient(120deg, var(--color-primary) 0%, var(--color-accent) 100%);

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "Noto Sans", sans-serif;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-md: 1.125rem;
  --text-lg: 1.25rem;

  /* Layout */
  --container-width: 1120px;
  --container-padding: clamp(1rem, 4vw, 2rem);
  --header-height: 68px;
  --section-space: clamp(4.5rem, 9vw, 7.5rem);

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  /* Spacing scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;
  --space-10: 8rem;

  /* Motion */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --duration-fast: 160ms;
  --duration: 240ms;
}

/* 2. Reset & base
   ------------------------------------------------------------------------ */
*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

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

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

main {
  flex: 1 0 auto;
}

main:focus-visible {
  outline: none;
}

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

ul,
ol {
  list-style: none;
}

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.15;
}

::selection {
  background: rgba(0, 200, 255, 0.25);
  color: var(--color-text);
}

/* 3. Accessibility primitives
   ------------------------------------------------------------------------ */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: var(--space-4);
  z-index: 200;
  transform: translateY(-200%);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  background: var(--color-surface-soft);
  color: var(--color-text);
  border: 1px solid var(--color-border-strong);
  font-size: var(--text-sm);
  transition: transform var(--duration-fast) var(--ease);
}

.skip-link:focus-visible {
  transform: translateY(0);
}

/* 4. Layout primitives
   ------------------------------------------------------------------------ */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

/* Anchor targets clear the sticky header when navigated to */
[id] {
  scroll-margin-top: calc(var(--header-height) + var(--space-3));
}

/* 5. Header & navigation
   ------------------------------------------------------------------------ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(6, 11, 22, 0.78);
  -webkit-backdrop-filter: blur(12px) saturate(140%);
  backdrop-filter: blur(12px) saturate(140%);
  border-bottom: 1px solid var(--color-border);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3) var(--space-4);
  min-height: var(--header-height);
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  border-radius: var(--radius-sm);
}

.site-brand__mark {
  height: 32px;
  width: auto;
}

.site-brand__name {
  font-size: var(--text-lg);
  font-weight: 700;
  letter-spacing: 0.14em;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.site-nav__link {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--color-text-muted);
  transition: color var(--duration-fast) var(--ease),
    background-color var(--duration-fast) var(--ease);
}

.site-nav__link:hover {
  color: var(--color-text);
  background-color: rgba(143, 160, 184, 0.08);
}

/* Mobile navigation toggle (progressive enhancement) */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 11px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

.nav-toggle__bar {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--duration) var(--ease),
    opacity var(--duration) var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile layout (no-JS fallback: nav wraps below the brand) */
@media (max-width: 768px) {
  .site-nav {
    flex-basis: 100%;
    order: 3;
  }

  .site-nav__list {
    flex-wrap: wrap;
    gap: var(--space-2) var(--space-4);
  }
}

/* JS-enhanced mobile menu */
@media (max-width: 768px) {
  .js .nav-toggle {
    display: inline-flex;
  }

  .js .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex-basis: auto;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 24px 48px -24px rgba(0, 0, 0, 0.55);
    padding: var(--space-4) var(--container-padding) var(--space-5);
  }

  .js .site-nav.is-open {
    display: block;
  }

  .js .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
  }

  .js .site-nav__link {
    display: flex;
    padding: var(--space-3);
    font-size: var(--text-md);
  }
}

/* 6. Hero
   ------------------------------------------------------------------------ */
.hero {
  position: relative;
  isolation: isolate;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-9) 0 var(--space-6);
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(to right, rgba(143, 160, 184, 0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(143, 160, 184, 0.06) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(ellipse 60% 60% at 50% 40%, #000 30%, transparent 75%);
  mask-image: radial-gradient(ellipse 60% 60% at 50% 40%, #000 30%, transparent 75%);
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 55% 45% at 50% 36%, rgba(0, 132, 255, 0.16), transparent 70%),
    radial-gradient(ellipse 42% 40% at 50% 62%, rgba(0, 200, 255, 0.1), transparent 70%);
}

.hero__inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
}

.hero__mark {
  width: clamp(150px, 26vw, 240px);
  height: auto;
  margin-bottom: var(--space-3);
  filter: drop-shadow(0 0 44px rgba(0, 200, 255, 0.22));
  animation: fade-up 0.7s var(--ease) both;
}

.hero__title {
  font-size: clamp(2.75rem, 9vw, 5.25rem);
  line-height: 1.02;
  letter-spacing: 0.03em;
  animation: fade-up 0.7s var(--ease) 0.08s both;
}

.hero__tagline {
  font-size: clamp(1.25rem, 3.5vw, 1.75rem);
  font-weight: 500;
  letter-spacing: 0.01em;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: fade-up 0.7s var(--ease) 0.16s both;
}

.hero__copy {
  max-width: 46ch;
  font-size: var(--text-md);
  line-height: 1.7;
  color: var(--color-text-muted);
  text-wrap: balance;
  animation: fade-up 0.7s var(--ease) 0.24s both;
}

/* 7. Page sections
   ------------------------------------------------------------------------ */
.section {
  padding: var(--section-space) 0;
}

.section--surface {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section-header {
  margin-bottom: var(--space-7);
}

.eyebrow {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  max-width: 30ch;
}

.section-intro {
  margin-top: var(--space-4);
  color: var(--color-text-muted);
  font-size: var(--text-md);
  line-height: 1.7;
  max-width: 60ch;
}

/* 8. Prose & thesis
   ------------------------------------------------------------------------ */
.prose {
  max-width: 68ch;
  color: var(--color-text-muted);
  font-size: var(--text-md);
  line-height: 1.7;
}

.prose p + p {
  margin-top: var(--space-5);
}

.prose .lead {
  color: var(--color-text);
  font-size: clamp(1.125rem, 2.4vw, 1.375rem);
  line-height: 1.6;
}

.thesis {
  margin-top: var(--space-7);
  padding-left: var(--space-5);
  border-left: 2px solid var(--color-accent);
  font-size: var(--text-lg);
  line-height: 1.5;
  font-weight: 500;
  color: var(--color-text);
  max-width: 44ch;
}

/* 9. Buttons
   ------------------------------------------------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.01em;
  line-height: 1.4;
  border: 1px solid transparent;
  transition: background-color var(--duration-fast) var(--ease),
    border-color var(--duration-fast) var(--ease),
    color var(--duration-fast) var(--ease);
}

.btn--primary {
  background: var(--color-primary-strong);
  color: #ffffff;
}

.btn--primary:hover {
  background: #0057a8;
}

.btn--ghost {
  border-color: var(--color-border-strong);
  color: var(--color-text);
}

.btn--ghost:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-3);
  margin-top: var(--space-2);
}

/* 10. Approach flow
   ------------------------------------------------------------------------ */
.flow {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
  position: relative;
}

.flow::before {
  content: "";
  position: absolute;
  top: 22px;
  left: 12.5%;
  right: 12.5%;
  height: 1px;
  background: var(--gradient-accent);
  opacity: 0.35;
}

.flow__step {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.flow__index {
  position: relative;
  z-index: 1;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--color-border-strong);
  background: var(--color-surface);
  color: var(--color-accent);
  font-size: var(--text-sm);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.flow__body {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.flow__title {
  font-size: var(--text-lg);
  font-weight: 600;
  letter-spacing: 0.01em;
}

.flow__copy {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  line-height: 1.6;
}

@media (max-width: 768px) {
  .flow {
    grid-template-columns: 1fr;
    gap: var(--space-5);
  }

  .flow::before {
    top: 0;
    bottom: 0;
    left: 22px;
    right: auto;
    width: 1px;
    height: auto;
    background: var(--gradient-accent);
    opacity: 0.35;
  }

  .flow__step {
    flex-direction: row;
    gap: var(--space-4);
  }

  .flow__index {
    flex-shrink: 0;
  }

  .flow__body {
    padding-top: var(--space-1);
  }
}

/* 11. Principles
   ------------------------------------------------------------------------ */
.principles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-7) var(--space-6);
}

.principle::before {
  content: "";
  display: block;
  width: 32px;
  height: 2px;
  border-radius: 2px;
  background: var(--gradient-accent);
  margin-bottom: var(--space-4);
}

.principle__title {
  font-size: var(--text-md);
  font-weight: 600;
  letter-spacing: 0.01em;
  margin-bottom: var(--space-2);
}

.principle__copy {
  color: var(--color-text-muted);
  font-size: var(--text-base);
  line-height: 1.6;
}

@media (max-width: 768px) {
  .principles {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
}

/* 12. Products
   ------------------------------------------------------------------------ */
.product {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-areas: "content visual";
  gap: var(--space-8);
  align-items: center;
}

.product--reverse {
  grid-template-areas: "visual content";
}

.product__content {
  grid-area: content;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-3);
}

.product__visual {
  grid-area: visual;
}

.product + .product {
  margin-top: var(--space-7);
  padding-top: var(--space-7);
  border-top: 1px solid var(--color-border);
}

.product__meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-2);
}

.product__index {
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}

.product__status {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.product__status::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
}

.product__status--operational::before {
  background: var(--color-accent);
}

.product__status--dev::before {
  border: 1.5px solid var(--color-text-muted);
}

.product__name {
  font-size: clamp(2.5rem, 6vw, 4rem);
  line-height: 1;
  letter-spacing: 0.02em;
}

.product__full {
  font-size: var(--text-md);
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--color-text);
}

.product__by {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-text-muted);
}

.product__copy {
  margin-top: var(--space-2);
  max-width: 48ch;
  font-size: var(--text-md);
  line-height: 1.7;
  color: var(--color-text-muted);
}

.product__caps {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3) var(--space-5);
  margin-top: var(--space-4);
}

.product__caps li {
  position: relative;
  padding-left: var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--color-text);
}

.product__caps li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 10px;
  height: 2px;
  border-radius: 2px;
  background: var(--gradient-accent);
}

.product__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-3);
  padding: var(--space-2) 0;
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--color-accent);
  transition: color var(--duration-fast) var(--ease);
}

.product__link__arrow {
  transition: transform var(--duration-fast) var(--ease);
}

.product__link:hover {
  color: var(--color-text);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-color: var(--color-accent);
}

.product__link:hover .product__link__arrow {
  transform: translateX(3px);
}

/* Product visual panels */
.panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding: var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
}

.panel__label {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.panel__foot {
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
}

/* SOIE ranking motif */
.rank-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.rank-row {
  display: grid;
  grid-template-columns: 24px 1fr;
  align-items: center;
  gap: var(--space-3);
}

.rank-row__num {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}

.rank-row__bar {
  display: block;
  justify-self: start;
  height: 8px;
  border-radius: 999px;
  background: var(--gradient-accent);
  opacity: 0.85;
}

.rank-row:nth-child(1) .rank-row__bar { width: 92%; }
.rank-row:nth-child(2) .rank-row__bar { width: 74%; }
.rank-row:nth-child(3) .rank-row__bar { width: 58%; }
.rank-row:nth-child(4) .rank-row__bar { width: 40%; }

/* COIE multi-factor motif */
.factor-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.factor {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.factor__name {
  font-size: var(--text-xs);
  letter-spacing: 0.02em;
  color: var(--color-text-muted);
}

.factor__bar {
  display: block;
  height: 6px;
  border-radius: 999px;
  background: var(--gradient-accent);
  opacity: 0.7;
}

.factor:nth-child(1) .factor__bar { width: 92%; }
.factor:nth-child(2) .factor__bar { width: 78%; }
.factor:nth-child(3) .factor__bar { width: 64%; }
.factor:nth-child(4) .factor__bar { width: 82%; }
.factor:nth-child(5) .factor__bar { width: 48%; }

.factor-result {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-top: var(--space-2);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}

.factor-result__label {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text);
}

.factor-result__bar {
  display: block;
  height: 8px;
  width: 100%;
  border-radius: 999px;
  background: var(--gradient-accent);
}

@media (max-width: 768px) {
  .product {
    grid-template-columns: 1fr;
    grid-template-areas:
      "content"
      "visual";
    gap: var(--space-6);
  }

  .product + .product {
    margin-top: var(--space-6);
    padding-top: var(--space-6);
  }
}

/* 13. Contact
   ------------------------------------------------------------------------ */
.contact__copy {
  max-width: 60ch;
  color: var(--color-text-muted);
  font-size: var(--text-md);
  line-height: 1.7;
}

.contact__email {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-4);
  font-size: clamp(1.25rem, 4vw, 1.75rem);
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--color-accent);
  overflow-wrap: anywhere;
  transition: color var(--duration-fast) var(--ease);
}

.contact__email__arrow {
  transition: transform var(--duration-fast) var(--ease);
}

.contact__email:hover {
  color: var(--color-text);
}

.contact__email:hover .contact__email__arrow {
  transform: translateX(4px);
}

/* 14. Footer
   ------------------------------------------------------------------------ */
.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-deep);
  padding: var(--space-7) 0 var(--space-6);
}

.footer__inner {
  display: grid;
  gap: var(--space-5);
}

.footer__name {
  display: block;
  font-size: var(--text-lg);
  font-weight: 700;
  letter-spacing: 0.14em;
}

.footer__tagline {
  display: block;
  margin-top: var(--space-1);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.footer__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-4);
}

.footer__link {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  transition: color var(--duration-fast) var(--ease);
}

.footer__link:hover {
  color: var(--color-text);
}

.footer__copyright {
  margin-top: var(--space-2);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
}

@media (min-width: 769px) {
  .footer__inner {
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "brand nav"
      "copyright copyright";
    align-items: start;
  }

  .footer__brand { grid-area: brand; }
  .footer__nav { grid-area: nav; }
  .footer__copyright { grid-area: copyright; }
}

/* 15. Motion
   ------------------------------------------------------------------------ */
@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}