/* =============================================================
   TANGO LAB — styles
   Palette inspired by modern ATC displays:
   deep slate bg, electric cyan accent, violet + amber for status.
   ============================================================= */

:root {
  --bg:           #0a0e1a;
  --bg-soft:      #0f1524;
  --bg-panel:    #131a2d;
  --bg-elev:     #1a2238;
  --line:        rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.14);

  --text:        #e6ecf4;
  --text-soft:   #a8b3c7;
  --text-dim:    #64748b;

  --cyan:        #22d3ee;
  --cyan-soft:   #67e8f9;
  --violet:      #a78bfa;
  --amber:       #fbbf24;
  --teal:        #2dd4bf;
  --pink:        #f472b6;

  --radius-sm:   6px;
  --radius:      10px;
  --radius-lg:   16px;

  --font-sans:   'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono:   'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(34, 211, 238, 0.08), transparent 60%),
    radial-gradient(ellipse 60% 40% at 100% 40%, rgba(167, 139, 250, 0.05), transparent 60%),
    var(--bg);
  min-height: 100vh;
}

a { color: var(--cyan); text-decoration: none; }
a:hover { color: var(--cyan-soft); }

h1, h2, h3, h4 {
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0;
}
h2 { font-size: clamp(28px, 3.2vw, 44px); line-height: 1.15; }
h4 { font-size: 16px; color: var(--text); margin-bottom: 4px; }
h5 {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--text-dim);
  text-transform: uppercase;
  margin: 0 0 12px 0;
}

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

/* ============================================================ */
/* TOP STRIP                                                    */
/* ============================================================ */
.topstrip {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(10, 14, 26, 0.75);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.topstrip-inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 14px 28px;
  display: flex;
  align-items: center;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--cyan);
}
.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border: 1px solid var(--cyan);
  border-radius: 6px;
  color: var(--cyan);
}
.brand-name {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--text);
}
.brand-dot { color: var(--cyan); margin: 0 2px; }
.topnav {
  margin-left: auto;
  display: flex;
  gap: 22px;
}
.topnav a {
  color: var(--text-soft);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.02em;
}
.topnav a:hover { color: var(--text); }
.topmeta { display: flex; align-items: center; }
.meta-chip {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--text-dim);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
}
.dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  display: inline-block;
}
.dot-live {
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan);
  animation: dot-pulse 2.2s ease-in-out infinite;
}
@keyframes dot-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.55; transform: scale(0.88); }
}

@media (max-width: 720px) {
  .topnav { display: none; }
  .topmeta { margin-left: auto; }
}

/* ============================================================ */
/* HERO                                                         */
/* ============================================================ */
.hero {
  position: relative;
  min-height: calc(100vh - 57px);
  overflow: hidden;
  display: flex;
  align-items: center;
}
.sector-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(10, 14, 26, 0.15) 0%, rgba(10, 14, 26, 0.55) 55%, rgba(10, 14, 26, 0.92) 100%),
    linear-gradient(90deg, rgba(10, 14, 26, 0.85) 0%, rgba(10, 14, 26, 0.25) 55%, rgba(10, 14, 26, 0.15) 100%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1240px;
  margin: 0 auto;
  padding: 56px 28px 140px;
  width: 100%;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  background: rgba(34, 211, 238, 0.08);
  border: 1px solid rgba(34, 211, 238, 0.3);
  padding: 8px 14px;
  border-radius: 999px;
  margin-bottom: 28px;
}
.eyebrow-tick { color: var(--cyan); }

.hero-title {
  font-size: clamp(40px, 6.5vw, 88px);
  line-height: 1.02;
  letter-spacing: -0.03em;
  font-weight: 700;
  margin-bottom: 24px;
  max-width: 900px;
}
.hero-title-accent {
  color: var(--cyan);
  background: linear-gradient(90deg, var(--cyan), var(--teal));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-lede {
  font-size: clamp(17px, 1.6vw, 20px);
  color: var(--text-soft);
  max-width: 620px;
  margin: 0 0 40px 0;
  line-height: 1.55;
}

.hero-cta { display: flex; gap: 12px; margin-bottom: 64px; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 22px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: all 0.15s ease;
  cursor: pointer;
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--cyan);
  color: #031018;
  font-weight: 600;
}
.btn-primary:hover {
  background: var(--cyan-soft);
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(34, 211, 238, 0.22);
}
.btn-ghost {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  border-color: var(--line-strong);
}
.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.22);
  color: var(--text);
}

.hero-stats {
  display: flex;
  gap: 48px;
  margin: 0;
  flex-wrap: wrap;
}
.hero-stats > div { display: flex; flex-direction: column; gap: 2px; }
.hero-stats dt {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--text-dim);
  text-transform: uppercase;
}
.hero-stats dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--text);
  font-weight: 500;
}

.hero-bottombar {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  z-index: 3;
  padding: 14px 28px;
  border-top: 1px solid var(--line);
  background: rgba(10, 14, 26, 0.65);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: 0.08em;
  overflow-x: auto;
}
.hero-bottombar .hr {
  flex: 0 0 1px;
  height: 10px;
  background: var(--line-strong);
}

/* ============================================================ */
/* SECTIONS                                                     */
/* ============================================================ */
.section {
  padding: 120px 0;
  position: relative;
}
.section-inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 28px;
}
.section-head { margin-bottom: 56px; max-width: 760px; }
.section-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--cyan);
  text-transform: uppercase;
  display: block;
  margin-bottom: 14px;
}
.section-dek {
  color: var(--text-soft);
  font-size: 17px;
  max-width: 560px;
  margin-top: 16px;
}

/* ============================================================ */
/* PROBLEM                                                      */
/* ============================================================ */
.section-problem { border-top: 1px solid var(--line); }
.problem-grid { display: grid; grid-template-columns: 1fr 1.4fr; gap: 72px; align-items: start; }
.problem-lede {
  font-size: clamp(18px, 1.6vw, 22px);
  line-height: 1.5;
  color: var(--text);
}
.problem-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 28px; }
.problem-list li {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 16px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
}
.problem-list li:first-child { border-top: none; padding-top: 0; }
.problem-num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cyan);
  font-weight: 500;
  letter-spacing: 0.08em;
}
.problem-list h4 { font-size: 18px; margin-bottom: 4px; }
.problem-list p { color: var(--text-soft); margin: 0; font-size: 15px; }

@media (max-width: 900px) {
  .problem-grid { grid-template-columns: 1fr; gap: 40px; }
}

/* ============================================================ */
/* USE CASE (shared)                                            */
/* ============================================================ */
.usecase-grid {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 72px;
  align-items: start;
}
.usecase-grid-reverse { grid-template-columns: 1.15fr 1fr; }
.usecase-grid-reverse .usecase-copy { order: 2; }
.usecase-grid-reverse .usecase-media { order: 1; }

.section-usecase { border-top: 1px solid var(--line); }
.section-lab { background: linear-gradient(180deg, transparent, rgba(167, 139, 250, 0.04)); }

.usecase-copy h2 { margin-top: 14px; }
.usecase-lede {
  font-size: 18px;
  color: var(--text-soft);
  margin: 20px 0 28px 0;
  line-height: 1.55;
}
.feature-list { list-style: none; padding: 0; margin: 0 0 32px 0; display: flex; flex-direction: column; gap: 12px; }
.feature-list li {
  display: grid;
  grid-template-columns: 22px 1fr;
  gap: 8px;
  font-size: 15px;
  color: var(--text);
}
.fl-tick {
  color: var(--cyan);
  font-family: var(--font-mono);
  font-weight: 500;
}

.audience { margin-top: 32px; }
.audience-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.audience-tags span {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  padding: 6px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--text-soft);
}

/* Media frame (browser-chrome-style) */
.media-frame {
  background: var(--bg-panel);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow:
    0 24px 60px rgba(0, 0, 0, 0.45),
    0 0 0 1px rgba(34, 211, 238, 0.08);
}
.media-frame-dark { border-color: rgba(167, 139, 250, 0.24); }
.media-frame-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.02);
}
.mf-dot {
  width: 10px; height: 10px;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 50%;
}
.mf-label {
  margin-left: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: 0.06em;
}
.media-frame img {
  width: 100%;
  display: block;
  background: #000;
}
.media-caption {
  margin: 12px 2px 0 2px;
  font-size: 13px;
  color: var(--text-dim);
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

/* Quote (lab section) */
.quote {
  margin-top: 8px;
  padding: 20px 22px;
  border-left: 2px solid var(--violet);
  background: rgba(167, 139, 250, 0.05);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.quote blockquote {
  margin: 0;
  font-size: 18px;
  font-weight: 500;
  color: var(--text);
  line-height: 1.4;
  letter-spacing: -0.01em;
}
.quote cite {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  font-style: normal;
  letter-spacing: 0.08em;
  margin-top: 10px;
  display: block;
}

/* Experiment list (lab section) */
.experiment-list { margin-top: 28px; }
.experiments { display: flex; flex-direction: column; gap: 1px; background: var(--line); border-radius: var(--radius-sm); overflow: hidden; }
.experiment {
  display: grid;
  grid-template-columns: 96px 1fr auto;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  background: var(--bg-panel);
  font-size: 13px;
}
.exp-status {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.1em;
  padding: 3px 8px;
  border-radius: 3px;
  text-align: center;
  white-space: nowrap;
}
.exp-shipped  { background: rgba(45, 212, 191, 0.15); color: var(--teal); }
.exp-progress { background: rgba(251, 191, 36, 0.15); color: var(--amber); }
.exp-next     { background: rgba(167, 139, 250, 0.18); color: var(--violet); }
.exp-research { background: rgba(255, 255, 255, 0.06); color: var(--text-dim); }
.exp-name { color: var(--text); font-weight: 500; }
.exp-note { color: var(--text-dim); font-size: 12px; text-align: right; }

@media (max-width: 900px) {
  .usecase-grid,
  .usecase-grid-reverse {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .usecase-grid-reverse .usecase-copy { order: 1; }
  .usecase-grid-reverse .usecase-media { order: 2; }
  .experiment { grid-template-columns: 90px 1fr; }
  .exp-note { grid-column: 1 / -1; text-align: left; }
}

/* ============================================================ */
/* STACK                                                        */
/* ============================================================ */
.section-stack { border-top: 1px solid var(--line); background: rgba(255, 255, 255, 0.015); }
.stack-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
}
.stack-col { background: var(--bg-panel); padding: 28px 24px; }
.stack-col h4 {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--cyan);
  text-transform: uppercase;
  margin: 0 0 18px 0;
  font-weight: 500;
}
.stack-col ul { list-style: none; padding: 0; margin: 0; }
.stack-col li {
  padding: 12px 0;
  border-top: 1px solid var(--line);
  font-size: 14px;
  color: var(--text);
}
.stack-col li:first-child { border-top: none; padding-top: 0; }
.stack-col li strong { font-weight: 500; color: var(--text); }
.stack-col li .muted { display: block; font-size: 12px; color: var(--text-dim); margin-top: 2px; }

@media (max-width: 820px) {
  .stack-grid { grid-template-columns: 1fr; }
}

/* ============================================================ */
/* CONTACT                                                      */
/* ============================================================ */
.section-contact { border-top: 1px solid var(--line); }
.contact-inner { display: grid; grid-template-columns: 1.2fr 1fr; gap: 60px; align-items: center; }
.contact-lede { color: var(--text-soft); font-size: 17px; margin-top: 20px; max-width: 520px; }

.contact-card {
  background: var(--bg-panel);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.contact-row {
  display: grid;
  grid-template-columns: 90px 1fr;
  align-items: center;
  padding: 6px 0;
  border-top: 1px solid var(--line);
  gap: 12px;
}
.contact-row:first-child { border-top: none; padding-top: 0; }
.contact-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--text-dim);
  text-transform: uppercase;
}
.contact-row a, .contact-row span:last-child {
  font-size: 15px;
  color: var(--text);
}

@media (max-width: 820px) {
  .contact-inner { grid-template-columns: 1fr; }
}

/* ============================================================ */
/* FOOTER                                                       */
/* ============================================================ */
.footer {
  border-top: 1px solid var(--line);
  padding: 30px 0;
}
.footer-inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--text-dim);
}
.footer-brand { color: var(--text-soft); }
.footer-meta { display: flex; gap: 10px; flex-wrap: wrap; }
.footer-meta .sep { opacity: 0.4; }

@media (max-width: 600px) {
  .footer-inner { flex-direction: column; align-items: flex-start; }
}

/* ============================================================ */
/* REDUCED MOTION                                               */
/* ============================================================ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0s !important;
    transition-duration: 0s !important;
  }
}