/* ─── Variables ─────────────────────────────────────────────────────────── */
:root {
  --bg:        #05080f;
  --surface:   #0d1117;
  --card:      #0f1623;
  --card-hover:#111d2e;
  --border:    #1e2d3d;
  --border-hi: #2d4a6b;

  --primary:   #6366f1;
  --primary-lo:rgba(99,102,241,0.12);
  --primary-glow:0 0 28px rgba(99,102,241,0.35);
  --cyan:      #22d3ee;
  --cyan-lo:   rgba(34,211,238,0.12);
  --green:     #34d399;
  --yellow:    #fbbf24;
  --red:       #f87171;

  --text:      #f1f5f9;
  --text-dim:  #94a3b8;
  --text-muted:#475569;

  --font:      -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --mono:      'JetBrains Mono', 'Fira Code', Consolas, monospace;

  --r:         12px;
  --r-lg:      20px;
  --nav-h:     68px;
}

/* ─── Reset ─────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}
img, svg { display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* ─── Utility ────────────────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}
.section-label {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 0.75rem;
}
.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}
.section-sub {
  color: var(--text-dim);
  font-size: 1.05rem;
  max-width: 560px;
  margin-bottom: 3rem;
}
.grad-text {
  background: linear-gradient(135deg, var(--primary) 0%, var(--cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Reveal animation */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.55s ease, transform 0.55s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ─── Buttons ─────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.7rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.2s;
  white-space: nowrap;
}
.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 0 0 0 rgba(99,102,241,0.4);
}
.btn-primary:hover {
  background: #4f52e8;
  box-shadow: var(--primary-glow);
  transform: translateY(-1px);
}
.btn-secondary {
  background: var(--primary-lo);
  color: var(--primary);
  border: 1px solid rgba(99,102,241,0.3);
}
.btn-secondary:hover {
  background: rgba(99,102,241,0.2);
  border-color: var(--primary);
}
.btn-outline {
  background: transparent;
  color: var(--text-dim);
  border: 1px solid var(--border);
}
.btn-outline:hover { border-color: var(--border-hi); color: var(--text); }

/* ─── Navigation ─────────────────────────────────────────────────────────── */
#nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 900;
  transition: background 0.3s, border-color 0.3s;
}
#nav.scrolled {
  background: rgba(5,8,15,0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex;
  align-items: center;
  height: 100%;
  gap: 2rem;
}
.nav-logo {
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, #fff 30%, var(--cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  flex-shrink: 0;
}
#nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  margin: 0 auto;
  list-style: none;
}
#nav-links a {
  font-size: 0.875rem;
  color: var(--text-dim);
  transition: color 0.2s;
}
#nav-links a:hover { color: var(--text); }
.nav-cta { margin-left: auto; }
#nav-burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  margin-left: auto;
  padding: 6px;
}
#nav-burger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-dim);
  border-radius: 2px;
  transition: all 0.25s;
}

/* ─── Hero ───────────────────────────────────────────────────────────────── */
#hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-h);
  overflow: hidden;
}
#neural-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}
.hero-radial {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 55% at 50% 40%, rgba(99,102,241,0.1) 0%, transparent 70%),
    radial-gradient(ellipse 40% 30% at 75% 20%, rgba(34,211,238,0.06) 0%, transparent 60%);
  pointer-events: none;
}
.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 5rem 0 4rem;
  width: 100%;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.85rem;
  background: var(--primary-lo);
  border: 1px solid rgba(99,102,241,0.25);
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--primary);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}
.hero-badge::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--primary);
  animation: blink 2s ease-in-out infinite;
}
.hero-h1 {
  font-size: clamp(2.4rem, 5.5vw, 4.2rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.04em;
  margin-bottom: 1.5rem;
}
.hero-sub {
  font-size: clamp(1rem, 1.8vw, 1.2rem);
  color: var(--text-dim);
  max-width: 640px;
  margin: 0 auto 2.5rem;
  line-height: 1.7;
}
.hero-cta {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}
.hero-code {
  display: inline-block;
  text-align: left;
  background: rgba(13,17,23,0.85);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 1.2rem 1.5rem;
  margin-bottom: 2.5rem;
  backdrop-filter: blur(8px);
}
.hero-code pre {
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--text-dim);
}
.hero-code .k  { color: var(--primary); }
.hero-code .s  { color: #a5d6ff; }
.hero-code .v  { color: var(--cyan); }
.hero-code .p  { color: var(--text-muted); }
.hero-voice-hint {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}
.hero-voice-hint svg { color: var(--cyan); }
.scroll-arrow {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  color: var(--text-muted);
  animation: bounce 2.2s ease-in-out infinite;
}

/* ─── Services ───────────────────────────────────────────────────────────── */
#services { padding: 6rem 0; }
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}
.service-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 1.75rem;
  transition: border-color 0.25s, background 0.25s, transform 0.25s, box-shadow 0.25s;
  cursor: default;
}
.service-card:hover {
  border-color: rgba(99,102,241,0.45);
  background: var(--card-hover);
  transform: translateY(-3px);
  box-shadow: 0 16px 40px rgba(0,0,0,0.4), 0 0 0 1px rgba(99,102,241,0.2);
}
.service-icon {
  width: 44px;
  height: 44px;
  background: var(--primary-lo);
  border: 1px solid rgba(99,102,241,0.2);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  color: var(--primary);
}
.service-card h3 {
  font-size: 0.975rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
  line-height: 1.3;
}
.service-card p {
  font-size: 0.845rem;
  color: var(--text-dim);
  line-height: 1.65;
  margin-bottom: 1rem;
}
.service-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
}
.service-tags li {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  background: var(--primary-lo);
  color: var(--primary);
  border-radius: 4px;
}

/* ─── How it works ───────────────────────────────────────────────────────── */
#how-it-works { padding: 5rem 0; background: var(--surface); }
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: 1rem;
}
.step {
  text-align: center;
  padding: 2rem;
}
.step-num {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--primary-lo);
  border: 1px solid rgba(99,102,241,0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--primary);
  margin: 0 auto 1rem;
}
.step h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 0.5rem; }
.step p  { font-size: 0.875rem; color: var(--text-dim); }

/* ─── Tech stack ─────────────────────────────────────────────────────────── */
#tech-stack { padding: 5rem 0; }
.tech-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.tech-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.9rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-dim);
  transition: border-color 0.2s, color 0.2s;
}
.tech-badge:hover { border-color: var(--border-hi); color: var(--text); }
.tech-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  flex-shrink: 0;
}

/* ─── Use cases ──────────────────────────────────────────────────────────── */
#use-cases { padding: 5rem 0; background: var(--surface); }
.cases-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}
.case-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 2rem;
  transition: border-color 0.25s;
}
.case-card:hover { border-color: rgba(34,211,238,0.4); }
.case-icon {
  font-size: 1.8rem;
  margin-bottom: 0.75rem;
}
.case-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 0.5rem; }
.case-card p  { font-size: 0.875rem; color: var(--text-dim); line-height: 1.65; }

/* ─── About ──────────────────────────────────────────────────────────────── */
#about { padding: 5rem 0; }
.about-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}
.about-text h2 { margin-bottom: 1rem; }
.about-text p  { color: var(--text-dim); line-height: 1.8; margin-bottom: 1rem; }
.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}
.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 1.5rem;
  text-align: center;
}
.stat-num  { font-size: 2rem; font-weight: 800; display: block; }
.stat-label{ font-size: 0.8rem; color: var(--text-muted); }

/* ─── Contact ────────────────────────────────────────────────────────────── */
#contact { padding: 6rem 0; background: var(--surface); }
.contact-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}
.contact-info h2  { margin-bottom: 1rem; }
.contact-info p   { color: var(--text-dim); margin-bottom: 1.5rem; }
.contact-email {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--cyan);
  transition: opacity 0.2s;
}
.contact-email:hover { opacity: 0.8; }
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form-group { display: flex; flex-direction: column; gap: 0.4rem; }
.form-group label { font-size: 0.8rem; font-weight: 600; color: var(--text-dim); }
.form-group input,
.form-group textarea,
.form-group select {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.7rem 0.9rem;
  font-family: var(--font);
  font-size: 0.9rem;
  color: var(--text);
  transition: border-color 0.2s;
  outline: none;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus { border-color: var(--primary); }
.form-group select option { background: var(--card); }
.form-group textarea { resize: vertical; min-height: 120px; }

/* ─── Footer ─────────────────────────────────────────────────────────────── */
footer {
  padding: 2rem 0;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}
footer a { color: var(--text-dim); transition: color 0.2s; }
footer a:hover { color: var(--text); }

/* ─── Voice widget ───────────────────────────────────────────────────────── */
#voice-widget {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 950;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.75rem;
}
.voice-label {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.8rem;
  background: rgba(5,8,15,0.85);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.75rem;
  color: var(--text-dim);
  backdrop-filter: blur(8px);
  white-space: nowrap;
  pointer-events: none;
  animation: fadeIn 0.6s ease 2s both;
}
.voice-label::before {
  content: '';
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--cyan);
  animation: blink 2s ease-in-out infinite;
}
#voice-panel {
  width: 320px;
  background: rgba(13,17,23,0.95);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  backdrop-filter: blur(20px);
  overflow: hidden;
  display: none;
  flex-direction: column;
  box-shadow: 0 24px 60px rgba(0,0,0,0.6);
}
#voice-panel.open { display: flex; animation: slideUp 0.25s ease; }

.voice-panel-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.9rem 1rem;
  border-bottom: 1px solid var(--border);
}
.voice-panel-title {
  font-size: 0.875rem;
  font-weight: 700;
  flex: 1;
}
.voice-panel-sub {
  font-size: 0.75rem;
  color: var(--text-dim);
}
#voice-close {
  width: 26px; height: 26px;
  border-radius: 50%;
  background: rgba(255,255,255,0.05);
  color: var(--text-dim);
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}
#voice-close:hover { background: rgba(255,255,255,0.1); color: var(--text); }

.voice-status-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1rem;
  font-size: 0.78rem;
  color: var(--text-dim);
  border-bottom: 1px solid var(--border);
}
#voice-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--primary);
  flex-shrink: 0;
  transition: background 0.3s;
}
#voice-dot.pulse { animation: dotPulse 1.2s ease-in-out infinite; }

#voice-waveform {
  width: 100%;
  height: 72px;
  display: block;
  padding: 0 1rem;
}

#voice-transcript {
  max-height: 160px;
  overflow-y: auto;
  padding: 0.75rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}
.transcript-item {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}
.transcript-who {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}
.transcript-user .transcript-who  { color: var(--cyan); }
.transcript-assistant .transcript-who { color: var(--primary); }
.transcript-text {
  font-size: 0.82rem;
  color: var(--text-dim);
  line-height: 1.5;
}

.voice-panel-footer {
  padding: 0.75rem 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.72rem;
  color: var(--text-muted);
  text-align: center;
}

#voice-btn {
  position: relative;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(99,102,241,0.5);
  transition: transform 0.2s, box-shadow 0.2s, background 0.3s;
  flex-shrink: 0;
}
#voice-btn:hover {
  transform: scale(1.07);
  box-shadow: 0 6px 28px rgba(99,102,241,0.65);
}
#voice-btn::before {
  content: '';
  position: absolute;
  inset: -8px;
  border-radius: 50%;
  border: 1px solid rgba(99,102,241,0.3);
  animation: ringPulse 2.5s ease-out infinite;
}
#voice-btn[data-state="listening"] { background: #22d3ee; box-shadow: 0 4px 20px rgba(34,211,238,0.5); }
#voice-btn[data-state="speaking"]  { background: #818cf8; box-shadow: 0 4px 20px rgba(129,140,248,0.5); }
#voice-btn[data-state="connecting"]{ background: #f59e0b; box-shadow: 0 4px 20px rgba(245,158,11,0.5); }
#voice-btn[data-state="error"]     { background: var(--red); box-shadow: 0 4px 20px rgba(248,113,113,0.5); }

/* ─── Keyframes ──────────────────────────────────────────────────────────── */
@keyframes blink     { 0%,100%{ opacity:1 } 50%{ opacity:0.3 } }
@keyframes bounce    { 0%,100%{ transform:translateX(-50%) translateY(0) } 50%{ transform:translateX(-50%) translateY(8px) } }
@keyframes ringPulse { 0%{ transform:scale(1); opacity:0.6 } 100%{ transform:scale(1.7); opacity:0 } }
@keyframes dotPulse  { 0%,100%{ transform:scale(1); opacity:1 } 50%{ transform:scale(1.5); opacity:0.6 } }
@keyframes slideUp   { from{ opacity:0; transform:translateY(12px) } to{ opacity:1; transform:none } }
@keyframes fadeIn    { from{ opacity:0 } to{ opacity:1 } }

/* ─── Responsive ─────────────────────────────────────────────────────────── */
@media (max-width: 900px) {
  .services-grid    { grid-template-columns: repeat(2, 1fr); }
  .about-inner      { grid-template-columns: 1fr; }
  .contact-inner    { grid-template-columns: 1fr; }
  .steps            { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  #nav-links {
    display: none;
    position: fixed;
    top: var(--nav-h); left: 0; right: 0;
    background: rgba(5,8,15,0.97);
    flex-direction: column;
    gap: 0;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border);
  }
  #nav-links.open { display: flex; }
  #nav-links li   { width: 100%; }
  #nav-links a    { display: block; padding: 0.75rem 1.5rem; font-size: 1rem; }
  .nav-cta        { display: none; }
  #nav-burger     { display: flex; }

  .services-grid  { grid-template-columns: 1fr; }
  .cases-grid     { grid-template-columns: 1fr; }
  .about-stats    { grid-template-columns: 1fr 1fr; }
  .form-row       { grid-template-columns: 1fr; }

  #voice-widget   { bottom: 1.5rem; right: 1.5rem; }
  #voice-panel    { width: calc(100vw - 3rem); }
  .voice-label    { display: none; }
}

@media (max-width: 480px) {
  .hero-h1 { font-size: 2.1rem; }
  .hero-code { display: none; }
}