/* Refined landing page styles */
/* Visual update only: no text/content logic changes */

:root {
  /* Core text */
  --color-primary-text: #111827;
  --color-secondary-text: #4b5563;
  --color-tertiary-text: #6b7280;

  /* Backgrounds */
  --color-bg-main: #f7f8fb;
  --color-bg-card: #ffffff;
  --color-bg-soft: #eef2f8;
  --color-bg-soft-2: #e8eef7;
  --color-bg-pattern: #edf2f7;
  --color-card-dark: #384556;
  --color-card-dark-2: #445163;

  /* Accent */
  --color-accent: #2f6fed;
  --color-accent-hover: #245ed0;
  --color-accent-soft: #dbe7ff;
  --color-accent-soft-2: #c9d9f2;
  --color-btn-dark: #111827;

  /* Borders */
  --color-border-light: #d6dde8;
  --color-border-subtle: #e5e9f0;
  --color-border-strong: #c8d1de;

  /* Typography */
  --font-family: 'Inter', system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --fs-base: 1rem;
  --fs-small: 0.875rem;
  --fs-h3: 1.375rem;
  --fs-h2: 2rem;
  --fs-h1: 3rem;

  /* Spacing */
  --space-0: 0;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 2.5rem;
  --space-8: 3rem;
  --space-9: 4rem;
  --space-10: 5rem;

  /* Radius */
  --radius-sm: 0.625rem;
  --radius-md: 1rem;
  --radius-lg: 1.25rem;
  --radius-xl: 1.5rem;
  --radius-pill: 999px;

  /* Shadows */
  --shadow-card: 0 8px 24px rgba(16, 24, 40, 0.05);
  --shadow-card-hover: 0 16px 36px rgba(16, 24, 40, 0.08);
  --shadow-soft: 0 2px 10px rgba(16, 24, 40, 0.04);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-family);
  font-size: var(--fs-base);
  line-height: 1.65;
  color: var(--color-secondary-text);
  background:
    radial-gradient(circle at top left, rgba(47, 111, 237, 0.05), transparent 26%),
    linear-gradient(180deg, #f9fbff 0%, var(--color-bg-main) 18%, var(--color-bg-main) 100%);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: inherit;
}

.container {
  width: 100%;
  max-width: 76rem;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

.section {
  padding-top: var(--space-9);
  padding-bottom: var(--space-9);
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  z-index: 50;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: rgba(255, 255, 255, 0.82);
  border-bottom: 1px solid rgba(214, 221, 232, 0.75);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  min-height: 3.25rem;
  padding-top: var(--space-2);
  padding-bottom: var(--space-2);
}

.brand {
  min-width: 0;
}

.brand-name {
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-primary-text);
  line-height: 1.2;
}

.brand-role {
  margin-top: 0.1rem;
  font-size: 0.75rem;
  color: var(--color-tertiary-text);
  line-height: 1.35;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.main-nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.25rem;
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius-pill);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-secondary-text);
  transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
  white-space: nowrap;
}

.main-nav a:hover,
.main-nav a:focus-visible {
  background: var(--color-accent-soft);
  color: var(--color-primary-text);
  transform: translateY(-1px);
  outline: none;
}

/* Hero */
.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at 50% 0%, rgba(47, 111, 237, 0.12), transparent 38%),
    linear-gradient(180deg, #eef4ff 0%, #f6f8fc 55%, #f7f8fb 100%);
}

.hero::before {
  content: "";
  position: absolute;
  inset: auto auto -8rem -8rem;
  width: 24rem;
  height: 24rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(47, 111, 237, 0.08) 0%, transparent 68%);
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  inset: -8rem -10rem auto auto;
  width: 26rem;
  height: 26rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(94, 143, 255, 0.08) 0%, transparent 65%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding-top: var(--space-8);
  padding-bottom: var(--space-8);
}

.hero-title {
  margin: 0 0 var(--space-4);
  max-width: 52rem;
  font-size: var(--fs-h1);
  line-height: 1.08;
  letter-spacing: -0.04em;
  color: var(--color-primary-text);
}

.hero-text {
  margin: 0;
  max-width: 58rem;
  font-size: 1.125rem;
  color: var(--color-secondary-text);
}

/* Section headings */
.section-heading {
  margin-bottom: var(--space-5);
}

.section-heading--wide p,
.diagram-heading--wide p {
  max-width: 60rem;
}

.section-heading h2 {
  margin: 0 0 var(--space-3);
  font-size: var(--fs-h2);
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--color-primary-text);
}

.section-heading p {
  margin: 0;
  font-size: 1.0625rem;
  color: var(--color-tertiary-text);
}

.diagram-heading h3 {
  margin: 0 0 var(--space-2);
  font-size: var(--fs-h3);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--color-primary-text);
}

.diagram-heading p {
  margin: 0;
  font-size: 1rem;
  color: var(--color-tertiary-text);
}



.action-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-4);
  list-style: none;
  padding: 0;
  margin: 0;
}

.action-list li {
  position: relative;
  display: flex;
  align-items: flex-start;
  min-height: 100%;
  padding: 1.25rem 1.1rem 1.15rem 1.1rem;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  color: var(--color-secondary-text);
  font-size: 0.98rem;
  line-height: 1.55;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}


.action-list li {
  padding-left: 1.25rem 1.2rem;
}

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

/* Systems overview */
.systems-overview {
  position: relative;
  background:
    linear-gradient(180deg, var(--color-bg-soft) 0%, var(--color-bg-soft-2) 100%);
  border-top: 1px solid var(--color-border-subtle);
  border-bottom: 1px solid var(--color-border-subtle);
}

.systems-overview.section {
  padding-top: var(--space-8);
  padding-bottom: var(--space-8);
}

.diagram-block {
  margin-top: var(--space-6);
}

.diagram-block:first-of-type {
  margin-top: var(--space-5);
}

/* Translation diagram */
.translation-diagram,
.capability-diagram {
  padding: 1.6rem;
  border: 1px solid rgba(214, 221, 232, 0.95);
  border-radius: 1.5rem;
  background: rgba(255, 255, 255, 0.46);
  box-shadow: var(--shadow-soft);
  overflow: visible;
}

.translation-flow {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  grid-auto-rows: 1fr;
  gap: 3rem;
  max-width: 70rem;
  margin: var(--space-5) auto 0;
  justify-content: stretch;
}

.translation-flow .flow-arrow {
  display: none !important;
}

.flow-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  height: 100%;
  min-height: 19rem;
  padding: 1.35rem 1.25rem 1.25rem;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.flow-card:not(:last-child)::after {
  content: "→";
  position: absolute;
  top: 50%;
  right: -36px;
  transform: translateY(-50%);
  font-size: 16px;
  line-height: 1;
  color: #8fa2c2;
  font-weight: 300;
  z-index: 3;
}

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

.flow-card--infra {
  border-top: 4px solid #c7d2e3;
}

.flow-card--platform {
  border-top: 4px solid #8fa6c8;
}

.flow-card--product {
  border-top: 4px solid #c7d2e3;
}

.flow-card h4 {
  margin: 0 0 var(--space-2);
  font-size: 1.1rem;
  line-height: 1.25;
  color: var(--color-primary-text);
}

.flow-group + .flow-group {
  padding-top: var(--space-2);
  border-top: 1px solid #edf1f6;
}

.flow-card h5 {
  margin: 0 0 0.3rem;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--color-secondary-text);
  line-height: 1.4;
}

.flow-card p,
.flow-card ul li {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.55;
  color: var(--color-tertiary-text);
}

.flow-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.6rem;
}

.flow-card ul li {
  position: relative;
  padding-left: 1rem;
}

.flow-card ul li::before {
  content: "";
  position: absolute;
  top: 0.62rem;
  left: 0;
  width: 0.38rem;
  height: 0.38rem;
  border-radius: 50%;
  background: #a6b4c8;
}

/* Capability grid */
.capability-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-5);
}

.capability-card {
  background:
    linear-gradient(180deg, var(--color-card-dark) 0%, var(--color-card-dark-2) 100%);
  color: #ffffff;
  padding: 1.4rem 1.35rem 1.3rem;
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 20px rgba(12, 18, 28, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.08);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.capability-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 32px rgba(9, 14, 23, 0.2);
}

.capability-card h4 {
  margin: 0 0 var(--space-3);
  font-size: 1.15rem;
  line-height: 1.25;
  color: #ffffff;
  letter-spacing: -0.01em;
}

.capability-card ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.capability-card li {
  position: relative;
  padding-left: 1rem;
  font-size: 0.92rem;
  line-height: 1.55;
  color: #e3e8f0;
}

.capability-card li::before {
  content: "";
  position: absolute;
  top: 0.62rem;
  left: 0;
  width: 0.38rem;
  height: 0.38rem;
  border-radius: 50%;
  background: #a6bddf;
}

/* Example areas */
.example-areas {
  background:
    linear-gradient(180deg, #f4f7fb 0%, var(--color-bg-pattern) 100%);
}

.example-areas.section {
  padding-top: var(--space-8);
  padding-bottom: var(--space-8);
}

.cards-grid {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-5);
}

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

.info-card {
  height: 100%;
  padding: 1.4rem 1.35rem 1.3rem;
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

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

.info-card h3 {
  margin: 0 0 var(--space-3);
  font-size: 1.15rem;
  line-height: 1.25;
  color: var(--color-primary-text);
}

.info-card p {
  margin: 0;
  font-size: 0.98rem;
  color: var(--color-secondary-text);
  line-height: 1.6;
}

/* Footer */
.site-footer {
  background:
    radial-gradient(circle at top right, rgba(82, 132, 255, 0.10), transparent 30%),
    linear-gradient(180deg, #3a4758 0%, #2f3b4b 100%);
  color: #cfd6e2;
  padding-top: var(--space-8);
  padding-bottom: var(--space-8);
}

.footer-top {
  margin-bottom: var(--space-5);
}

.footer-profile {
  max-width: 60rem;
}

.footer-title-row {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-bottom: var(--space-2);
}

.footer-name {
  margin: 0;
  font-size: 1.75rem;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: #ffffff;
}

.footer-role {
  margin: 0 0 var(--space-3);
  font-size: 1rem;
  color: #aeb8c7;
}

.footer-text {
  margin: 0;
  max-width: 60rem;
  font-size: 0.96rem;
  line-height: 1.7;
  color: #c7cfdb;
}

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

.footer-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: 0.72rem 1rem;
  border-radius: var(--radius-pill);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1;
  color: #ffffff;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  transition: background-color 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}

.footer-btn:hover,
.footer-btn:focus-visible {
  background: rgba(255,255,255,0.20);
  border-color: rgba(255,255,255,0.32);
  transform: translateY(-2px);
  outline: none;
}

.footer-bottom {
  margin-top: var(--space-5);
  padding-top: var(--space-4);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-keywords {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.6;
  color: #a3adbc;
}

.footer-note {
  margin: 0;
  font-size: 0.85rem;
  color: #667084;
}

/* Responsive */
@media (max-width: 1100px) {
  .action-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .capability-grid,
  .cards-grid--areas {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .translation-flow {
    grid-template-columns: 1fr;
  }

  .flow-card {
    min-height: auto;
  }

  .flow-card::after {
    display: none;
  }
}

@media (max-width: 820px) {
  .header-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .main-nav {
    width: 100%;
    justify-content: flex-start;
  }

  .hero-title {
    font-size: 2.45rem;
  }

  .section {
    padding-top: var(--space-7);
    padding-bottom: var(--space-7);
  }

  .translation-diagram,
  .capability-diagram {
    padding: 1.2rem;
    overflow: visible;
  }

  .footer-title-row {
    align-items: flex-start;
    justify-content: flex-start;
  }
}

@media (max-width: 640px) {
  .container {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .hero-inner {
    padding-top: var(--space-7);
    padding-bottom: var(--space-7);
  }

  .hero-title {
    font-size: 2rem;
    line-height: 1.12;
  }

  .hero-text,
  .section-heading p {
    font-size: 1rem;
  }

  .section-heading h2 {
    font-size: 1.7rem;
  }

  .diagram-heading h3 {
    font-size: 1.2rem;
  }

  .action-list,
  .capability-grid,
  .cards-grid--areas {
    grid-template-columns: 1fr;
  }

  .main-nav {
    gap: 0.3rem;
  }

  .main-nav a {
    font-size: 0.92rem;
  }

  .footer-actions {
    width: 100%;
  }

  .footer-btn {
    flex: 1 1 auto;
  }
}