/* ============================================================
   Valyn Platforms — single-page corporate site
   Design tokens
   ============================================================ */

@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
  src: url("assets/fonts/inter-var-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
    U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193,
    U+2212, U+2215, U+FEFF, U+FFFD;
}

:root {
  --navy: #0A1930;
  --navy-hover: #14263F;
  --ink: #0A1930;
  --text: #33415A;
  --muted: #5A6B84;
  --line: #E3E9F1;
  --line-strong: #C9D4E2;
  --tint: #F6F9FC;
  --tint-2: #EEF3F9;
  --bg: #FFFFFF;
  --on-navy-muted: #A7B7CD;

  --container: 1120px;
  --gutter: clamp(20px, 5vw, 32px);
  --section-pad: clamp(4.5rem, 9vw, 7.5rem);
  --radius: 16px;

  --shadow-card: 0 1px 2px rgba(10, 25, 48, 0.04), 0 12px 32px rgba(10, 25, 48, 0.06);
  --shadow-card-hover: 0 2px 4px rgba(10, 25, 48, 0.05), 0 18px 44px rgba(10, 25, 48, 0.1);

  --ease-out: cubic-bezier(0.22, 0.61, 0.36, 1);

  --fs-hero: clamp(2.4rem, 2.7vw + 1rem, 3.45rem);
  --fs-h2: clamp(1.85rem, 2.2vw + 0.9rem, 2.65rem);
  --fs-h3: 1.125rem;
  --fs-lead: clamp(1.05rem, 0.35vw + 1rem, 1.2rem);
}

/* ============================================================
   Base
   ============================================================ */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 92px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3 {
  margin: 0;
  color: var(--ink);
  line-height: 1.12;
  letter-spacing: -0.025em;
  text-wrap: balance;
}

p {
  margin: 0;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

a {
  color: var(--navy);
  text-decoration: none;
}

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

:focus-visible {
  outline: 2px solid var(--navy);
  outline-offset: 3px;
  border-radius: 4px;
}

.section-contact :focus-visible {
  outline-color: #ffffff;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--navy);
  color: #fff;
  border-radius: 0 0 10px 10px;
  font-weight: 600;
  font-size: 0.9rem;
  transition: top 0.2s var(--ease-out);
}

.skip-link:focus-visible {
  top: 0;
}

.container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ============================================================
   Shared elements
   ============================================================ */

.eyebrow {
  margin: 0 0 1.1rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.eyebrow-light {
  color: var(--on-navy-muted);
}

.section {
  padding-block: var(--section-pad);
}

.section-alt {
  background: var(--tint);
  border-block: 1px solid var(--line);
}

.section-head {
  max-width: 640px;
  margin-bottom: clamp(2.75rem, 6vw, 4.5rem);
}

.section-head h2 {
  font-size: var(--fs-h2);
}

.section-lead {
  margin-top: 1.25rem;
  font-size: var(--fs-lead);
  color: var(--muted);
  max-width: 56ch;
}

.section-head-split {
  max-width: none;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  align-items: end;
}

.section-head-split .section-lead {
  margin-top: 0;
}

/* Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 1.45rem;
  border: 1px solid transparent;
  border-radius: 10px;
  font-size: 0.96rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.2;
  cursor: pointer;
  transition: background-color 0.25s var(--ease-out), border-color 0.25s var(--ease-out),
    color 0.25s var(--ease-out), transform 0.25s var(--ease-out), box-shadow 0.25s var(--ease-out);
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--navy);
  color: #fff;
}

.btn-primary:hover {
  background: var(--navy-hover);
  transform: translateY(-1px);
  box-shadow: 0 10px 26px rgba(10, 25, 48, 0.22);
}

.btn-ghost {
  border-color: var(--line-strong);
  color: var(--navy);
  background: transparent;
}

.btn-ghost:hover {
  border-color: var(--navy);
  background: var(--tint);
  transform: translateY(-1px);
}

.btn-light {
  background: #fff;
  color: var(--navy);
}

.btn-light:hover {
  background: var(--tint-2);
  transform: translateY(-1px);
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.25);
}

.btn-sm {
  padding: 0.55rem 1.1rem;
  font-size: 0.9rem;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--navy);
}

.text-link svg {
  width: 15px;
  height: 15px;
  transition: transform 0.25s var(--ease-out);
}

.text-link:hover svg {
  transform: translate(2px, -2px);
}

.text-link:hover {
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* ============================================================
   Header
   ============================================================ */

.site-header {
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0);
  border-bottom: 1px solid transparent;
  transition: background-color 0.3s var(--ease-out), border-color 0.3s var(--ease-out),
    box-shadow 0.3s var(--ease-out);
}

.site-header.is-scrolled,
.nav-open .site-header {
  background: rgba(255, 255, 255, 0.85);
  -webkit-backdrop-filter: blur(14px) saturate(1.6);
  backdrop-filter: blur(14px) saturate(1.6);
  border-bottom-color: rgba(10, 25, 48, 0.08);
  box-shadow: 0 6px 24px rgba(10, 25, 48, 0.05);
}

.header-inner {
  height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--ink);
}

.wordmark-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 9px;
  background: var(--navy);
  color: #fff;
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1;
}

.wordmark-text {
  font-size: 1.05rem;
  font-weight: 400;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.wordmark-text strong {
  font-weight: 700;
}

.site-nav ul {
  display: flex;
  align-items: center;
  gap: clamp(1.25rem, 3vw, 2.25rem);
}

.site-nav a {
  position: relative;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
  padding-block: 0.4rem;
  transition: color 0.2s var(--ease-out);
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--navy);
  transition: right 0.28s var(--ease-out);
}

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

.site-nav a:hover::after {
  right: 0;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.9rem;
}

.nav-toggle {
  display: none;
  position: relative;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: #fff;
  cursor: pointer;
}

.nav-toggle-line {
  position: absolute;
  left: 12px;
  right: 12px;
  height: 2px;
  border-radius: 2px;
  background: var(--navy);
  transition: transform 0.3s var(--ease-out), top 0.3s var(--ease-out);
}

.nav-toggle-line:nth-child(1) {
  top: 16px;
}

.nav-toggle-line:nth-child(2) {
  top: 24px;
}

.nav-open .nav-toggle-line:nth-child(1) {
  top: 20px;
  transform: rotate(45deg);
}

.nav-open .nav-toggle-line:nth-child(2) {
  top: 20px;
  transform: rotate(-45deg);
}

/* ============================================================
   Hero
   ============================================================ */

.hero {
  position: relative;
  padding-top: clamp(9rem, 16vh, 11.5rem);
  padding-bottom: clamp(4rem, 8vw, 6.5rem);
  background:
    radial-gradient(52rem 30rem at 82% 6%, rgba(10, 25, 48, 0.05), transparent 68%),
    linear-gradient(180deg, #FBFCFE 0%, #FFFFFF 78%);
  overflow: hidden;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  align-items: center;
  gap: clamp(2.5rem, 5vw, 4.5rem);
}

.hero h1 {
  font-size: var(--fs-hero);
  line-height: 1.04;
  letter-spacing: -0.032em;
  font-weight: 700;
}

.hero-lead {
  margin-top: 1.6rem;
  max-width: 50ch;
  font-size: var(--fs-lead);
  color: var(--muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 2.4rem;
}

.hero-visual {
  min-width: 0;
}

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

.hv-parent-letter {
  font-family: inherit;
  font-size: 46px;
  font-weight: 700;
  fill: #ffffff;
  letter-spacing: -0.02em;
}

.hv-card {
  filter: drop-shadow(0 14px 22px rgba(10, 25, 48, 0.09));
}

.hv-line {
  stroke: #D8E1EC;
  stroke-width: 1.5;
}

.hv-flow {
  stroke: var(--navy);
  stroke-opacity: 0.35;
  stroke-width: 1.6;
  stroke-dasharray: 3 12;
  animation: hv-flow 3.2s linear infinite;
}

.hv-flow-2 {
  animation-delay: 0.5s;
}

.hv-flow-3 {
  animation-delay: 1s;
}

@keyframes hv-flow {
  to {
    stroke-dashoffset: -60;
  }
}

.hv-pulse {
  transform-box: fill-box;
  transform-origin: center;
  animation: hv-pulse 3.4s var(--ease-out) infinite;
}

@keyframes hv-pulse {
  0% {
    transform: scale(1);
    opacity: 0.4;
  }
  70%,
  100% {
    transform: scale(3.4);
    opacity: 0;
  }
}

/* CSS transforms override the SVG groups' transform attributes, so the
   float keyframes must carry each card's base translation with them. */
.hv-float-a {
  animation: hv-float 9s ease-in-out infinite alternate;
}

.hv-float-b,
.hv-float-c,
.hv-float-d {
  transform: translate(var(--hv-x, 0), var(--hv-y, 0));
  animation: hv-float-soft 8s ease-in-out infinite alternate;
}

.hv-float-b {
  --hv-x: 30px;
  --hv-y: 336px;
  animation-delay: 0.8s;
}

.hv-float-c {
  --hv-x: 205px;
  --hv-y: 322px;
  animation-duration: 10s;
}

.hv-float-d {
  --hv-x: 380px;
  --hv-y: 336px;
  animation-delay: 1.6s;
  animation-duration: 9s;
}

@keyframes hv-float {
  from {
    transform: translateY(0);
  }
  to {
    transform: translateY(-9px);
  }
}

@keyframes hv-float-soft {
  from {
    transform: translate(var(--hv-x, 0), var(--hv-y, 0)) translateY(0);
  }
  to {
    transform: translate(var(--hv-x, 0), var(--hv-y, 0)) translateY(-6px);
  }
}

/* Hero entrance sequence */

@keyframes hero-rise {
  from {
    opacity: 0;
    transform: translateY(26px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-seq {
  animation: hero-rise 0.85s var(--ease-out) both;
}

.hero-seq-1 { animation-delay: 0.05s; }
.hero-seq-2 { animation-delay: 0.15s; }
.hero-seq-3 { animation-delay: 0.28s; }
.hero-seq-4 { animation-delay: 0.4s; }
.hero-seq-5 { animation-delay: 0.3s; }

/* ============================================================
   Pillars (What Valyn Platforms Does)
   ============================================================ */

.pillar-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1rem, 2.5vw, 1.75rem);
}

.pillar-card {
  padding: clamp(1.6rem, 3vw, 2.25rem);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  transition: transform 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out),
    border-color 0.3s var(--ease-out);
}

.pillar-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--line-strong);
}

.pillar-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 13px;
  background: var(--tint-2);
  color: var(--navy);
  margin-bottom: 1.4rem;
}

.pillar-icon svg {
  width: 24px;
  height: 24px;
}

.pillar-card h3 {
  font-size: var(--fs-h3);
  margin-bottom: 0.5rem;
}

.pillar-card p {
  font-size: 0.98rem;
  color: var(--muted);
}

/* ============================================================
   Platform model diagram
   ============================================================ */

.model-flow {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 2.4rem;
  counter-reset: step;
}

.model-step {
  position: relative;
  padding: 1.5rem 1.35rem 1.6rem;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
}

.model-step:not(:first-child)::before {
  content: "";
  position: absolute;
  top: 50%;
  left: -1.65rem;
  width: 11px;
  height: 11px;
  margin-top: -6px;
  border-top: 2px solid var(--line-strong);
  border-right: 2px solid var(--line-strong);
  transform: rotate(45deg);
}

.model-num {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  margin-bottom: 0.9rem;
}

.model-step h3 {
  font-size: 1.02rem;
  margin-bottom: 0.45rem;
}

.model-step p {
  font-size: 0.88rem;
  line-height: 1.55;
  color: var(--muted);
}

.model-step-root {
  background: var(--navy);
  border-color: var(--navy);
}

.model-step-root h3 {
  color: #fff;
}

.model-step-root p,
.model-step-root .model-num {
  color: var(--on-navy-muted);
}

/* ============================================================
   Featured platform
   ============================================================ */

.platform-card {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  align-items: center;
  gap: clamp(2rem, 5vw, 4.5rem);
  padding: clamp(2rem, 4.5vw, 3.5rem);
  background: linear-gradient(135deg, #FBFCFE 0%, #F4F7FB 100%);
  border: 1px solid var(--line);
  border-radius: 22px;
  box-shadow: var(--shadow-card);
}

.platform-badge {
  display: inline-block;
  padding: 0.35rem 0.85rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: #fff;
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1.5rem;
}

.platform-name {
  font-size: clamp(1.7rem, 3vw, 2.2rem);
  margin-bottom: 0.9rem;
}

.platform-desc {
  max-width: 46ch;
  color: var(--muted);
  margin-bottom: 1.75rem;
}

.platform-card-visual {
  padding: clamp(1rem, 2vw, 1.5rem);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
}

/* ============================================================
   Principles
   ============================================================ */

.principles-list {
  border-top: 1px solid var(--line);
}

.principle {
  display: grid;
  grid-template-columns: 72px minmax(220px, 320px) 1fr;
  gap: clamp(1rem, 3vw, 2.5rem);
  align-items: baseline;
  padding-block: 1.7rem;
  border-bottom: 1px solid var(--line);
}

.principle-num {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.principle h3 {
  font-size: var(--fs-h3);
}

.principle p {
  color: var(--muted);
  font-size: 1rem;
}

/* ============================================================
   Contact
   ============================================================ */

.section-contact {
  background: var(--navy);
  background-image:
    radial-gradient(48rem 26rem at 50% -12%, rgba(255, 255, 255, 0.07), transparent 65%),
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: auto, 44px 44px, 44px 44px;
}

.contact-inner {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.section-contact h2 {
  color: #fff;
  font-size: var(--fs-h2);
}

.contact-copy {
  margin-top: 1.25rem;
  max-width: 46ch;
  color: var(--on-navy-muted);
  font-size: var(--fs-lead);
}

.contact-email {
  margin-top: 2.2rem;
  font-size: clamp(1.3rem, 3vw, 1.9rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: #fff;
  text-decoration: underline;
  text-decoration-color: rgba(255, 255, 255, 0.28);
  text-underline-offset: 7px;
  transition: text-decoration-color 0.25s var(--ease-out);
}

.contact-email:hover {
  text-decoration-color: #fff;
}

.contact-actions {
  margin-top: 2.4rem;
}

/* ============================================================
   Footer
   ============================================================ */

.site-footer {
  padding-top: clamp(3rem, 6vw, 4.5rem);
  background: #fff;
}

.footer-inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
  padding-bottom: 2.5rem;
}

.footer-tag {
  margin-top: 0.85rem;
  font-size: 0.92rem;
  color: var(--muted);
}

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

.footer-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
  transition: color 0.2s var(--ease-out);
}

.footer-links a:hover {
  color: var(--navy);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.footer-base {
  border-top: 1px solid var(--line);
  padding-block: 1.6rem;
}

.footer-base p {
  font-size: 0.88rem;
  color: var(--muted);
}

/* ============================================================
   Scroll reveal
   ============================================================ */

.js [data-reveal] {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
  transition-delay: var(--d, 0s);
}

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

/* ============================================================
   Responsive
   ============================================================ */

@media (max-width: 1000px) {
  .model-flow {
    grid-template-columns: minmax(0, 1fr);
    max-width: 520px;
    margin-inline: auto;
    gap: 2.1rem;
  }

  .model-step:not(:first-child)::before {
    top: -1.5rem;
    left: 50%;
    margin-top: 0;
    margin-left: -6px;
    transform: rotate(135deg);
  }
}

@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero {
    padding-top: clamp(7.5rem, 14vh, 9.5rem);
  }

  .hero-visual {
    max-width: 470px;
    margin-inline: auto;
    width: 100%;
  }

  .section-head-split {
    grid-template-columns: minmax(0, 1fr);
    align-items: start;
  }

  .pillar-grid {
    grid-template-columns: minmax(0, 1fr);
    max-width: 560px;
  }

  .platform-card {
    grid-template-columns: minmax(0, 1fr);
  }

  .platform-card-visual {
    max-width: 420px;
  }

  .principle {
    grid-template-columns: 48px minmax(0, 1fr);
    row-gap: 0.4rem;
  }

  .principle p {
    grid-column: 2;
  }
}

@media (max-width: 760px) {
  .nav-toggle {
    display: block;
  }

  .js .site-nav {
    position: fixed;
    top: 74px;
    left: 0;
    right: 0;
    z-index: 99;
    background: #fff;
    border-bottom: 1px solid var(--line);
    box-shadow: 0 18px 34px rgba(10, 25, 48, 0.08);
    padding: 0.75rem var(--gutter) 1.4rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.3s var(--ease-out), transform 0.3s var(--ease-out),
      visibility 0.3s;
  }

  .nav-open .site-nav {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .js .site-nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .js .site-nav a {
    display: block;
    padding: 0.85rem 0;
    font-size: 1.05rem;
    border-bottom: 1px solid var(--line);
  }

  .js .site-nav li:last-child a {
    border-bottom: 0;
  }

  .js .site-nav a::after {
    content: none;
  }

  /* Without JS the toggle can't work, so keep the inline nav visible. */
  html:not(.js) .site-nav ul {
    gap: 1rem;
  }

  html:not(.js) .site-nav a {
    font-size: 0.88rem;
  }

  html:not(.js) .nav-toggle {
    display: none;
  }
}

@media (max-width: 520px) {
  .header-actions .btn {
    display: none;
  }

  .hero-actions .btn {
    flex: 1 1 auto;
    min-width: 100%;
  }

  .platform-card {
    padding: 1.5rem;
  }
}

/* ============================================================
   Reduced motion
   ============================================================ */

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

  .hero-seq,
  .hv-flow,
  .hv-pulse,
  .hv-float-a,
  .hv-float-b,
  .hv-float-c,
  .hv-float-d {
    animation: none;
  }

  .hv-pulse {
    opacity: 0;
  }

  .js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .btn,
  .pillar-card,
  .text-link svg,
  .site-nav a::after {
    transition: none;
  }

  .btn:hover,
  .pillar-card:hover {
    transform: none;
  }
}