/* ==========================================================================
   Kin Kwan Engineering Co. Limited — style.css
   Computer Systems Design and Related Services
   Dark theme — near-black base with a purple-magenta accent
   ========================================================================== */

:root {
  --bg: #0B0E14;
  --bg-soft: #0F131D;
  --surface: #141826;
  --surface-2: #1A2033;
  --border: #272E42;
  --border-soft: #1C2233;
  --text: #E8EAED;
  --text-muted: #9BA5B8;
  --text-dim: #6C7590;
  --accent: #8B5CF6;
  --accent-deep: #7C3AED;
  --accent-magenta: #C026D3;
  --accent-soft: #B79CF8;
  --on-accent: #FFFFFF;
  --good: #34D399;
  --warn: #FBBF24;
  --radius: 16px;
  --radius-lg: 24px;
  --shadow: 0 18px 50px #00000066;
  --maxw: 1180px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-size: 16px;
  font-family: "Segoe UI", "Inter", "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

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

a {
  color: var(--accent-soft);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--accent);
}

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 28px;
}

/* ==========================================================================
   Scroll-reveal animation (safe without JavaScript)
   ========================================================================== */
.fade-up {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
  will-change: opacity, transform;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ==========================================================================
   Navigation — top-centered inline logo (links distributed left and right)
   ========================================================================== */
.logo-center-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: var(--bg);
  border-bottom: 1px solid var(--border-soft);
  transition: box-shadow 0.3s ease, background-color 0.3s ease;
}

.logo-center-nav.scrolled {
  box-shadow: 0 10px 30px #00000066;
}

.logo-center-nav .nav-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
  height: 78px;
}

.nav-side {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-side.nav-left {
  justify-content: flex-start;
}

.nav-side.nav-right {
  justify-content: flex-end;
}

.nav-side a {
  color: var(--text-muted);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.01em;
}

.nav-side a:hover {
  color: var(--text);
}

.logo-center-nav .brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 0.02em;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 11px;
  background: linear-gradient(135deg, var(--accent-deep), var(--accent-magenta));
  color: var(--on-accent);
  font-weight: 800;
  font-size: 18px;
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  padding: 10px 20px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent-deep), var(--accent-magenta));
  color: var(--on-accent);
  font-weight: 600;
  font-size: 14px;
  white-space: nowrap;
}

.nav-cta:hover {
  color: var(--on-accent);
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 26px;
  height: 2px;
  background-color: var(--text);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ==========================================================================
   Hero — left-aligned text + right visual split
   ========================================================================== */
.split-hero {
  position: relative;
  padding: 170px 0 110px;
  background:
    radial-gradient(1100px 520px at 85% -10%, #7C3AED33, transparent 60%),
    radial-gradient(900px 500px at -10% 30%, #C026D322, transparent 55%),
    var(--bg);
}

.split-hero .container {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 60px;
  align-items: center;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background-color: var(--surface);
  color: var(--accent-soft);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.hero-eyebrow .pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent);
  box-shadow: 0 0 0 0 var(--accent);
}

.split-hero h1 {
  margin-top: 26px;
  font-size: 54px;
  line-height: 1.08;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.split-hero h1 .grad {
  background: linear-gradient(120deg, var(--accent-soft), var(--accent-magenta));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--accent-soft);
}

.hero-lead {
  margin-top: 24px;
  max-width: 560px;
  font-size: 18px;
  color: var(--text-muted);
}

.hero-actions {
  margin-top: 34px;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 15px 30px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 16px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-deep), var(--accent-magenta));
  color: var(--on-accent);
  box-shadow: 0 12px 30px #7C3AED4D;
}

.btn-primary:hover {
  color: var(--on-accent);
  box-shadow: 0 16px 40px #7C3AED66;
}

.btn-ghost {
  background-color: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

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

.hero-note {
  margin-top: 22px;
  font-size: 14px;
  color: var(--text-dim);
}

/* Hero visual panel — system terminal mockup */
.hero-visual {
  position: relative;
}

.terminal {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.terminal-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 18px;
  background-color: var(--surface-2);
  border-bottom: 1px solid var(--border-soft);
}

.terminal-bar .dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.terminal-bar .dot-r { background-color: #F25F5C; }
.terminal-bar .dot-y { background-color: #F2B84B; }
.terminal-bar .dot-g { background-color: #3FBF7F; }

.terminal-bar .terminal-title {
  margin-left: 10px;
  font-size: 13px;
  color: var(--text-dim);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

.terminal-body {
  padding: 26px 24px;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 14px;
  line-height: 1.9;
}

.terminal-body .prompt {
  color: var(--accent-soft);
  font-weight: 700;
  margin-right: 8px;
}

.terminal-body .cmd {
  color: var(--text);
}

.terminal-body .ok {
  color: var(--good);
}

.terminal-body .muted {
  color: var(--text-dim);
}

.terminal-body .cursor {
  display: inline-block;
  width: 9px;
  height: 18px;
  background-color: var(--accent);
  vertical-align: middle;
  margin-left: 4px;
}

/* Floating stat card cluster beside terminal */
.hero-stat-card {
  position: absolute;
  bottom: -28px;
  left: -36px;
  background-color: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px 22px;
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  gap: 14px;
}

.hero-stat-card .big {
  font-size: 30px;
  font-weight: 800;
  background: linear-gradient(120deg, var(--accent-soft), var(--accent-magenta));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--accent-soft);
}

.hero-stat-card .lbl {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.4;
}

/* ==========================================================================
   Metrics band — full-width strip of counters
   ========================================================================== */
.metrics-band {
  padding: 90px 0;
  background-color: var(--bg-soft);
  border-top: 1px solid var(--border-soft);
  border-bottom: 1px solid var(--border-soft);
}

.metrics-band .metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.metric {
  text-align: center;
  padding: 28px 18px;
  border-radius: var(--radius);
  background-color: var(--surface);
  border: 1px solid var(--border-soft);
}

.metric .number {
  font-size: 44px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
  background: linear-gradient(120deg, var(--accent-soft), var(--accent-magenta));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--accent-soft);
}

.metric .label {
  margin-top: 12px;
  font-size: 14px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ==========================================================================
   Comparison section — table contrasting approaches
   ========================================================================== */
.comparison-section {
  padding: 110px 0;
  background-color: var(--bg);
}

.section-head {
  max-width: 720px;
  margin-bottom: 56px;
}

.section-head.centered {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.section-head .kicker {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-soft);
  margin-bottom: 14px;
}

.section-head h2 {
  font-size: 38px;
  line-height: 1.15;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.section-head p {
  margin-top: 16px;
  color: var(--text-muted);
  font-size: 17px;
}

.comparison-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background-color: var(--surface);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
}

.comparison-table th,
.comparison-table td {
  padding: 20px 24px;
  text-align: left;
  border-bottom: 1px solid var(--border-soft);
  font-size: 15px;
}

.comparison-table thead th {
  background-color: var(--surface-2);
  font-weight: 700;
  color: var(--text);
  font-size: 15px;
}

.comparison-table thead th.highlight-col {
  background: linear-gradient(135deg, var(--accent-deep), var(--accent-magenta));
  color: var(--on-accent);
}

.comparison-table tbody tr:last-child td {
  border-bottom: 0;
}

.comparison-table td.col-label {
  font-weight: 600;
  color: var(--text);
  background-color: var(--surface);
}

.comparison-table td.col-a {
  color: var(--text-muted);
}

.comparison-table td.col-b {
  background-color: #1A1730;
  color: var(--text);
}

.check {
  color: var(--good);
  font-weight: 700;
}

.cross {
  color: #F25F5C;
  font-weight: 700;
}

/* ==========================================================================
   Numbered list — ordered process
   ========================================================================== */
.numbered-list {
  padding: 110px 0;
  background-color: var(--bg-soft);
  border-top: 1px solid var(--border-soft);
}

.numbered-list .steps {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  counter-reset: step;
}

.step-card {
  position: relative;
  padding: 30px 30px 30px 96px;
  background-color: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.step-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}

.step-card .step-num {
  position: absolute;
  top: 26px;
  left: 26px;
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--accent-deep), var(--accent-magenta));
  color: var(--on-accent);
  font-size: 22px;
  font-weight: 800;
}

.step-card h3 {
  font-size: 20px;
  font-weight: 700;
}

.step-card p {
  margin-top: 10px;
  color: var(--text-muted);
  font-size: 15px;
}

/* ==========================================================================
   Capability grid — bento style service cards
   ========================================================================== */
.capability-section {
  padding: 110px 0;
  background-color: var(--bg);
}

.bento-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.bento-card {
  padding: 30px;
  background-color: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.bento-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}

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

.bento-card .card-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--surface-2);
  border: 1px solid var(--border);
  font-size: 24px;
}

.bento-card h3 {
  margin-top: 20px;
  font-size: 20px;
  font-weight: 700;
}

.bento-card p {
  margin-top: 10px;
  color: var(--text-muted);
  font-size: 15px;
}

.bento-card .tag-row {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  padding: 5px 12px;
  border-radius: 999px;
  background-color: var(--surface-2);
  border: 1px solid var(--border-soft);
  color: var(--accent-soft);
  font-size: 12px;
  font-weight: 600;
}

/* ==========================================================================
   Contact section
   ========================================================================== */
.contact-section {
  padding: 110px 0;
  background:
    radial-gradient(800px 400px at 50% 120%, #7C3AED2E, transparent 60%),
    var(--bg-soft);
  border-top: 1px solid var(--border-soft);
}

.contact-section .contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

.contact-list {
  list-style: none;
  margin-top: 26px;
}

.contact-list li {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 18px 0;
  border-bottom: 1px solid var(--border-soft);
}

.contact-list li:last-child {
  border-bottom: 0;
}

.contact-list .ci-icon {
  width: 44px;
  height: 44px;
  flex: none;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--surface);
  border: 1px solid var(--border);
  font-size: 20px;
}

.contact-list .ci-label {
  font-size: 13px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.contact-list .ci-value {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
}

.contact-form {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 34px;
}

.contact-form .field {
  margin-bottom: 20px;
}

.contact-form label {
  display: block;
  margin-bottom: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 14px 16px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background-color: var(--bg-soft);
  color: var(--text);
  font-size: 15px;
  font-family: inherit;
}

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

.contact-form textarea {
  resize: vertical;
  min-height: 130px;
}

.form-status {
  margin-top: 16px;
  padding: 12px 16px;
  border-radius: 10px;
  font-size: 14px;
  display: none;
}

.form-status.show {
  display: block;
}

.form-status.ok {
  background-color: #0E2A22;
  border: 1px solid #1E5C48;
  color: var(--good);
}

.form-status.err {
  background-color: #2A1412;
  border: 1px solid #5C2A24;
  color: #F25F5C;
}

/* ==========================================================================
   Footer — compact single row
   ========================================================================== */
.footer-row {
  background-color: var(--bg);
  border-top: 1px solid var(--border-soft);
  padding: 30px 0;
}

.footer-row .footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-row .foot-brand {
  font-weight: 700;
  color: var(--text);
  font-size: 15px;
}

.footer-row .foot-links {
  display: flex;
  gap: 24px;
  list-style: none;
  align-items: center;
}

.footer-row .foot-links a {
  color: var(--text-muted);
  font-size: 14px;
}

.footer-row .foot-links a:hover {
  color: var(--text);
}

.footer-row .foot-copy {
  color: var(--text-dim);
  font-size: 13px;
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 980px) {
  .split-hero .container {
    grid-template-columns: 1fr;
    gap: 70px;
  }

  .hero-stat-card {
    left: 10px;
    bottom: -22px;
  }

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

  .metrics-band .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .contact-section .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .numbered-list .steps {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .logo-center-nav .nav-inner {
    grid-template-columns: 1fr auto;
    height: 66px;
  }

  .nav-side {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .logo-center-nav .nav-inner.open .nav-side {
    display: flex;
    position: absolute;
    top: 66px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background-color: var(--bg);
    border-bottom: 1px solid var(--border-soft);
    padding: 12px 28px 24px;
    box-shadow: 0 20px 40px #00000066;
  }

  .logo-center-nav .nav-inner.open .nav-side.nav-left {
    grid-column: 1 / -1;
  }

  .logo-center-nav .nav-inner.open .nav-side.nav-right {
    grid-column: 1 / -1;
  }

  .logo-center-nav .nav-inner.open .nav-side a {
    padding: 12px 0;
    width: 100%;
  }

  .split-hero {
    padding: 130px 0 90px;
  }

  .split-hero h1 {
    font-size: 38px;
  }

  .hero-lead {
    font-size: 16px;
  }

  .section-head h2 {
    font-size: 30px;
  }

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

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

  .metrics-band .metrics-grid {
    grid-template-columns: 1fr 1fr;
    gap: 14px;
  }

  .metric .number {
    font-size: 34px;
  }

  .footer-row .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}