/* ============================================
   Zimu Technology - Global Stylesheet
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif&family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --color-bg: #fafaf7;
  --color-bg-alt: #f3f3ee;
  --color-ink: #14140f;
  --color-ink-soft: #4a4a45;
  --color-ink-faint: #8b8b85;
  --color-line: #e3e3dc;
  --color-accent: #c5532e;

  --font-display: 'Instrument Serif', 'Times New Roman', serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;

  --container: 1200px;
  --container-narrow: 880px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-ink);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: inherit;
  text-decoration: none;
  transition: opacity 0.2s ease;
}

a:hover {
  opacity: 0.65;
}

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

/* ============================================
   Typography
   ============================================ */

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--color-ink);
}

h1 {
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-style: italic;
}

h2 {
  font-size: clamp(2rem, 4vw, 3.25rem);
}

h3 {
  font-size: clamp(1.4rem, 2.2vw, 1.85rem);
}

h4 {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
}

p {
  color: var(--color-ink-soft);
  line-height: 1.7;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  margin-bottom: 1.25rem;
  display: inline-block;
}

.lead {
  font-size: 1.2rem;
  line-height: 1.55;
  color: var(--color-ink-soft);
  max-width: 640px;
}

/* ============================================
   Layout
   ============================================ */

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 2rem;
}

.container-narrow {
  max-width: var(--container-narrow);
  margin: 0 auto;
  padding: 0 2rem;
}

section {
  padding: 6rem 0;
}

.section-divider {
  border: 0;
  border-top: 1px solid var(--color-line);
  margin: 0;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 250, 247, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-line);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 2rem;
  max-width: var(--container);
  margin: 0 auto;
}

.nav-brand {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-style: italic;
  letter-spacing: -0.01em;
}

.nav-brand-mark {
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-ink-faint);
  border: 1px solid var(--color-line);
  padding: 2px 6px;
  border-radius: 2px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2.25rem;
  list-style: none;
}

.nav-menu a {
  font-size: 0.92rem;
  color: var(--color-ink-soft);
}

.nav-menu a.active,
.nav-menu a:hover {
  color: var(--color-ink);
  opacity: 1;
}

.nav-cta {
  font-size: 0.88rem;
  padding: 0.55rem 1.1rem;
  background: var(--color-ink);
  color: var(--color-bg) !important;
  border-radius: 100px;
  transition: transform 0.2s ease, background 0.2s ease;
}

.nav-cta:hover {
  background: var(--color-accent);
  opacity: 1 !important;
}

@media (max-width: 768px) {
  .nav-menu {
    gap: 1.2rem;
  }
  .nav-menu li:not(:last-child):not(.always-show) {
    display: none;
  }
}

/* ============================================
   Buttons
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.6rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: 100px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-primary {
  background: var(--color-ink);
  color: var(--color-bg);
}

.btn-primary:hover {
  background: var(--color-accent);
  opacity: 1;
  transform: translateY(-1px);
}

.btn-secondary {
  border-color: var(--color-line);
  color: var(--color-ink);
  background: transparent;
}

.btn-secondary:hover {
  border-color: var(--color-ink);
  opacity: 1;
}

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

.hero {
  padding: 7rem 0 6rem;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: center;
}

@media (min-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1.3fr 1fr;
    gap: 5rem;
  }
}

.hero-headline {
  margin-bottom: 1.5rem;
}

.hero-headline em {
  font-style: italic;
  color: var(--color-accent);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 2.25rem;
}

.hero-visual {
  position: relative;
  padding: 2rem;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-line);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--color-ink-soft);
}

.hero-visual-label {
  position: absolute;
  top: -10px;
  left: 1.5rem;
  background: var(--color-bg);
  padding: 0 0.6rem;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-ink-faint);
}

.metric-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 0.6rem 0;
  border-bottom: 1px dashed var(--color-line);
}

.metric-row:last-child {
  border-bottom: 0;
}

.metric-row .key {
  color: var(--color-ink-faint);
}

.metric-row .val {
  color: var(--color-ink);
  font-weight: 500;
}

.metric-row .val.up {
  color: #2d7a4f;
}

/* ============================================
   Trust strip
   ============================================ */

.trust-strip {
  padding: 2.25rem 0;
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  background: var(--color-bg-alt);
}

.trust-items {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 2.5rem 4rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-ink-faint);
}

.trust-items span:not(:last-child)::after {
  content: '·';
  margin-left: 4rem;
  color: var(--color-line);
}

@media (max-width: 768px) {
  .trust-items span::after {
    display: none !important;
  }
}

/* ============================================
   Capabilities cards
   ============================================ */

.section-heading {
  max-width: 720px;
  margin-bottom: 4rem;
}

.capabilities-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .capabilities-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.cap-card {
  padding: 2.5rem 2rem;
  background: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: 4px;
  transition: border-color 0.3s ease, transform 0.3s ease;
  position: relative;
  overflow: hidden;
}

.cap-card:hover {
  border-color: var(--color-ink);
  transform: translateY(-2px);
}

.cap-card .index {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-accent);
  margin-bottom: 2rem;
  display: block;
}

.cap-card h3 {
  margin-bottom: 1rem;
}

.cap-card p {
  font-size: 0.95rem;
}

/* ============================================
   Two column section
   ============================================ */

.two-col {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
}

@media (min-width: 900px) {
  .two-col {
    grid-template-columns: 1fr 1.5fr;
    gap: 5rem;
  }
}

.two-col-sticky h2 {
  position: sticky;
  top: 100px;
}

/* ============================================
   What We Do section
   ============================================ */

.bg-dark {
  background: var(--color-ink);
  color: var(--color-bg);
}

.bg-dark h1,
.bg-dark h2,
.bg-dark h3,
.bg-dark h4 {
  color: var(--color-bg);
}

.bg-dark p {
  color: rgba(250, 250, 247, 0.72);
}

.bg-dark .eyebrow {
  color: #e0916e;
}

.service-block {
  padding: 3rem 0;
  border-top: 1px solid rgba(250, 250, 247, 0.1);
}

.service-block:last-child {
  border-bottom: 1px solid rgba(250, 250, 247, 0.1);
}

.service-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: start;
}

@media (min-width: 768px) {
  .service-grid {
    grid-template-columns: 1fr 2fr;
    gap: 4rem;
  }
}

.service-num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: rgba(250, 250, 247, 0.5);
  letter-spacing: 0.1em;
}

.service-title {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  margin-top: 0.5rem;
  color: var(--color-bg);
}

.service-list {
  list-style: none;
  margin-top: 1.5rem;
}

.service-list li {
  padding: 0.6rem 0;
  padding-left: 1.5rem;
  position: relative;
  color: rgba(250, 250, 247, 0.78);
  border-bottom: 1px dashed rgba(250, 250, 247, 0.1);
}

.service-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: #e0916e;
}

/* ============================================
   Technology / API section (key for review)
   ============================================ */

.tech-section {
  background: var(--color-bg-alt);
}

.tech-card {
  background: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: 4px;
  padding: 3rem;
  margin-top: 2rem;
}

@media (max-width: 768px) {
  .tech-card {
    padding: 2rem 1.5rem;
  }
}

.tech-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-top: 2.5rem;
}

@media (min-width: 768px) {
  .tech-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 2.5rem 3rem;
  }
}

.tech-item h4 {
  margin-bottom: 0.6rem;
  color: var(--color-accent);
}

.tech-item p {
  font-size: 0.95rem;
}

.callout {
  margin-top: 2.5rem;
  padding: 1.5rem;
  border-left: 3px solid var(--color-accent);
  background: var(--color-bg-alt);
  font-size: 0.95rem;
  color: var(--color-ink-soft);
}

/* ============================================
   About page hero
   ============================================ */

.page-hero {
  padding: 6rem 0 4rem;
  border-bottom: 1px solid var(--color-line);
}

.page-hero .eyebrow {
  margin-bottom: 1.5rem;
}

.page-hero h1 {
  max-width: 900px;
  margin-bottom: 2rem;
}

.page-hero .lead {
  max-width: 700px;
}

/* ============================================
   Stats
   ============================================ */

.stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  margin-top: 4rem;
}

@media (min-width: 768px) {
  .stats {
    grid-template-columns: repeat(4, 1fr);
    gap: 3rem;
  }
}

.stat .num {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(2.5rem, 4vw, 3.5rem);
  color: var(--color-ink);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.stat .label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-ink-faint);
}

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

.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4rem;
}

@media (min-width: 900px) {
  .contact-grid {
    grid-template-columns: 1fr 1.4fr;
  }
}

.contact-info-block {
  margin-bottom: 2rem;
}

.contact-info-block h4 {
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.contact-info-block p,
.contact-info-block a {
  font-size: 1rem;
  color: var(--color-ink);
}

.contact-info-block a {
  border-bottom: 1px solid var(--color-line);
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-ink-faint);
  margin-bottom: 0.6rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.85rem 1rem;
  font-family: var(--font-body);
  font-size: 1rem;
  border: 1px solid var(--color-line);
  background: var(--color-bg);
  color: var(--color-ink);
  border-radius: 4px;
  transition: border-color 0.2s ease;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-ink);
}

.form-group textarea {
  min-height: 140px;
  resize: vertical;
}

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

.footer {
  background: var(--color-ink);
  color: rgba(250, 250, 247, 0.7);
  padding: 4rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 1.5fr 1fr 1fr;
  }
}

.footer-brand h3 {
  color: var(--color-bg);
  font-style: italic;
  margin-bottom: 1rem;
}

.footer-brand p {
  color: rgba(250, 250, 247, 0.55);
  font-size: 0.92rem;
  line-height: 1.6;
  max-width: 320px;
}

.footer-col h5 {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(250, 250, 247, 0.5);
  margin-bottom: 1.25rem;
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 0.6rem;
}

.footer-col a {
  color: rgba(250, 250, 247, 0.75);
  font-size: 0.95rem;
}

.footer-col a:hover {
  color: var(--color-bg);
}

.footer-bottom {
  border-top: 1px solid rgba(250, 250, 247, 0.1);
  padding-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: rgba(250, 250, 247, 0.45);
}

/* ============================================
   Legal pages (Privacy / Terms)
   ============================================ */

.legal-doc {
  padding: 5rem 0 6rem;
}

.legal-doc h1 {
  margin-bottom: 0.5rem;
}

.legal-doc .updated {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-ink-faint);
  margin-bottom: 3rem;
  display: block;
}

.legal-doc h2 {
  font-size: 1.5rem;
  margin: 3rem 0 1rem;
  font-style: normal;
  font-family: var(--font-body);
  font-weight: 600;
}

.legal-doc h2:first-of-type {
  margin-top: 0;
}

.legal-doc p {
  margin-bottom: 1rem;
  color: var(--color-ink);
  line-height: 1.75;
}

/* ============================================
   Animations
   ============================================ */

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-up {
  animation: fadeUp 0.8s ease forwards;
}

.fade-up-delay-1 {
  animation: fadeUp 0.8s ease 0.1s forwards;
  opacity: 0;
}

.fade-up-delay-2 {
  animation: fadeUp 0.8s ease 0.2s forwards;
  opacity: 0;
}

.fade-up-delay-3 {
  animation: fadeUp 0.8s ease 0.3s forwards;
  opacity: 0;
}