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

:root {
  --primary: #00e5a0;
  --primary-dark: #00c98b;
  --secondary: #00b4d8;
  --accent: #7b61ff;
  --dark: #0d1117;
  --darker: #080b10;
  --card: #111820;
  --light: #e6edf3;
  --gray: #7d8590;
  --success: #00e5a0;
  --warning: #f0b429;
  --danger: #f85149;
  --border: rgba(48, 54, 61, 0.8);
  --glow: rgba(0, 229, 160, 0.15);
  --grid-color: rgba(48, 54, 61, 0.4);
  --font-mono: "JetBrains Mono", "Fira Code", "SF Mono", monospace;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--darker);
  color: var(--light);
  line-height: 1.6;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(var(--grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: 0;
  opacity: 0.5;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  position: relative;
  z-index: 1;
}

/* Header */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(8, 11, 16, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 0;
}

.logo {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
  transition: opacity 0.3s;
  letter-spacing: -0.5px;
}

.logo::before {
  content: ">";
  margin-right: 6px;
  opacity: 0.5;
}

.logo:hover {
  opacity: 0.8;
}

.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  color: var(--gray);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9rem;
  transition: color 0.3s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
}

.btn {
  display: inline-block;
  padding: 10px 22px;
  border-radius: 6px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.3s;
  cursor: pointer;
  border: none;
  font-size: 0.9rem;
  font-family: var(--font-mono);
}

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

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(0, 229, 160, 0.3);
}

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

.btn-outline:hover {
  background: rgba(0, 229, 160, 0.1);
  box-shadow: 0 0 20px rgba(0, 229, 160, 0.15);
}

/* Hero */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--primary) 0%, transparent 70%);
  opacity: 0.07;
  top: -150px;
  right: -150px;
  animation: pulse 6s ease-in-out infinite;
}

.hero::after {
  content: "";
  position: absolute;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--secondary) 0%, transparent 70%);
  opacity: 0.05;
  bottom: -100px;
  left: -100px;
  animation: pulse 6s ease-in-out infinite 3s;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.07; }
  50% { transform: scale(1.15); opacity: 0.12; }
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-text h1 {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 20px;
}

.hero-text h1 span {
  color: var(--primary);
  text-shadow: 0 0 40px rgba(0, 229, 160, 0.3);
}

.hero-text p {
  font-size: 1.15rem;
  color: var(--gray);
  margin-bottom: 30px;
}

.hero-buttons {
  display: flex;
  gap: 15px;
}

.hero-visual {
  position: relative;
}

/* Dashboard Preview Card */
.dashboard-preview {
  background: var(--card);
  border-radius: 12px;
  border: 1px solid var(--border);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  overflow: hidden;
}

.dash-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.3);
}

.dash-header-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.dash-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.dash-dot.green { background: var(--success); box-shadow: 0 0 8px var(--success); }
.dash-dot.yellow { background: var(--warning); }
.dash-dot.red { background: var(--danger); }

.dash-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--gray);
}

.dash-status {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.dash-status .pulse-dot {
  width: 6px;
  height: 6px;
  background: var(--primary);
  border-radius: 50%;
  animation: blink 2s infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.dash-body {
  padding: 20px;
}

.dash-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}

.metric-card {
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
}

.metric-label {
  font-size: 0.7rem;
  color: var(--gray);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 6px;
}

.metric-value {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}

.metric-value.secondary { color: var(--secondary); }
.metric-value.accent { color: var(--accent); }

.metric-change {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--success);
  margin-top: 4px;
}

.dash-chart {
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 16px;
}

.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.chart-title {
  font-size: 0.75rem;
  color: var(--gray);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.chart-legend {
  display: flex;
  gap: 12px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.7rem;
  color: var(--gray);
}

.legend-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
}

.chart-bars {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  height: 80px;
}

.chart-bar {
  flex: 1;
  border-radius: 2px 2px 0 0;
  min-height: 4px;
  transition: height 0.5s ease;
  animation: growBar 1s ease forwards;
}

.chart-bar.primary { background: var(--primary); opacity: 0.8; }
.chart-bar.secondary { background: var(--secondary); opacity: 0.6; }

@keyframes growBar {
  from { height: 0; }
}

.dash-log {
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--gray);
  line-height: 1.8;
}

.log-line .time {
  color: var(--gray);
  opacity: 0.6;
}

.log-line .status-ok { color: var(--success); }
.log-line .status-info { color: var(--secondary); }
.log-line .status-warn { color: var(--warning); }

/* Badge */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  background: rgba(0, 229, 160, 0.1);
  border: 1px solid rgba(0, 229, 160, 0.25);
  color: var(--primary);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 20px;
}

/* Features */
.features {
  padding: 100px 0;
  position: relative;
  z-index: 1;
}

.section-title {
  text-align: center;
  margin-bottom: 60px;
}

.section-title h2 {
  font-size: 2.3rem;
  margin-bottom: 15px;
}

.section-title p {
  color: var(--gray);
  font-size: 1.05rem;
}

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

.feature-card {
  background: var(--card);
  padding: 28px;
  border-radius: 8px;
  border: 1px solid var(--border);
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}

.feature-card:hover {
  border-color: var(--primary);
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(0, 229, 160, 0.08);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: rgba(0, 229, 160, 0.1);
  border: 1px solid rgba(0, 229, 160, 0.2);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}

.feature-icon svg {
  width: 24px;
  height: 24px;
  stroke: var(--primary);
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.feature-card h3 {
  font-size: 1.15rem;
  margin-bottom: 8px;
  font-family: var(--font-mono);
}

.feature-card p {
  color: var(--gray);
  font-size: 0.9rem;
}

.feature-card .feature-stat {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--primary);
}

/* Pricing */
.pricing {
  padding: 100px 0;
  background: var(--dark);
  position: relative;
  z-index: 1;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 40px;
}

.pricing-card {
  background: var(--card);
  padding: 36px;
  border-radius: 8px;
  border: 1px solid var(--border);
  text-align: center;
  position: relative;
  transition: all 0.3s;
}

.pricing-card.popular {
  border-color: var(--primary);
  box-shadow: 0 0 40px rgba(0, 229, 160, 0.08);
  transform: scale(1.03);
}

.pricing-card.popular::before {
  content: "RECOMMENDED";
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary);
  color: var(--darker);
  padding: 4px 16px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 1px;
}

.pricing-card h3 {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  margin-bottom: 8px;
}

.price {
  font-family: var(--font-mono);
  font-size: 2.8rem;
  font-weight: 700;
  margin: 20px 0;
  color: var(--light);
}

.price span {
  font-size: 0.9rem;
  color: var(--gray);
  font-weight: 400;
}

.pricing-features {
  list-style: none;
  margin: 28px 0;
  text-align: left;
}

.pricing-features li {
  padding: 8px 0;
  color: var(--gray);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
}

.pricing-features li::before {
  content: "[+]";
  font-family: var(--font-mono);
  color: var(--primary);
  font-size: 0.75rem;
  font-weight: 700;
}

/* Coming Soon / Notify */
.coming-soon {
  padding: 100px 0;
  text-align: center;
  background: linear-gradient(135deg, rgba(0, 229, 160, 0.03), rgba(0, 180, 216, 0.03));
  position: relative;
  z-index: 1;
}

.notify-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  height: 72px;
  background: rgba(0, 229, 160, 0.1);
  border: 1px solid rgba(0, 229, 160, 0.25);
  border-radius: 12px;
  margin-bottom: 30px;
  animation: float 3s ease-in-out infinite;
}

.notify-icon svg {
  stroke: var(--primary);
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.coming-soon h2 {
  font-size: 2.3rem;
  margin-bottom: 20px;
}

.coming-soon p {
  color: var(--gray);
  font-size: 1.1rem;
  margin-bottom: 30px;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.coming-soon .btn-lg {
  padding: 14px 30px;
  font-size: 1rem;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.launch-date {
  margin-top: 25px;
  font-family: var(--font-mono);
  font-size: 0.85rem !important;
  color: var(--gray) !important;
  margin-bottom: 0 !important;
}

/* Footer */
footer {
  padding: 80px 0 40px;
  background: var(--dark);
  border-top: 1px solid var(--border);
  position: relative;
  z-index: 1;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand {
  max-width: 280px;
}

.footer-brand .logo {
  display: inline-block;
  margin-bottom: 15px;
}

.footer-brand p {
  color: var(--gray);
  font-size: 0.9rem;
  line-height: 1.7;
}

.footer-links h4 {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--light);
  text-transform: uppercase;
  letter-spacing: 1px;
}

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

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  color: var(--gray);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.3s;
}

.footer-links a:hover {
  color: var(--primary);
}

.footer-bottom {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid var(--border);
  color: var(--gray);
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

/* Main Chat Window on Hero */
.main-chat-window {
  background: var(--card);
  border-radius: 12px;
  border: 1px solid var(--border);
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.5);
  display: flex;
  flex-direction: column;
  height: 500px;
  overflow: hidden;
}

.main-chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  background: rgba(0, 0, 0, 0.4);
  border-bottom: 1px solid var(--border);
}

.chat-header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.chat-avatar-main {
  width: 40px;
  height: 40px;
  background: rgba(0, 229, 160, 0.15);
  border: 1px solid rgba(0, 229, 160, 0.3);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.chat-avatar-main svg {
  width: 22px;
  height: 22px;
  stroke: var(--primary);
}

.chat-header-info h4 {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 2px;
}

.chat-status-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--gray);
}

.status-indicator {
  width: 6px;
  height: 6px;
  background: var(--warning);
  border-radius: 50%;
  animation: blink 2s infinite;
}

.main-chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.main-chat-messages::-webkit-scrollbar {
  width: 4px;
}

.main-chat-messages::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 2px;
}

.chat-welcome {
  text-align: center;
  padding: 30px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
}

.welcome-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 60px;
  background: rgba(0, 229, 160, 0.1);
  border: 1px solid rgba(0, 229, 160, 0.2);
  border-radius: 12px;
  margin-bottom: 18px;
}

.welcome-icon svg {
  width: 28px;
  height: 28px;
  stroke: var(--primary);
}

.chat-welcome h3 {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  margin-bottom: 8px;
}

.chat-welcome p {
  color: var(--gray);
  font-size: 0.9rem;
  max-width: 280px;
  line-height: 1.5;
}

.welcome-suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
  justify-content: center;
}

.suggestion-btn {
  padding: 8px 14px;
  background: rgba(0, 229, 160, 0.08);
  border: 1px solid rgba(0, 229, 160, 0.2);
  border-radius: 4px;
  color: var(--light);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  cursor: pointer;
  transition: all 0.2s;
}

.suggestion-btn:hover {
  background: rgba(0, 229, 160, 0.15);
  border-color: var(--primary);
}

/* Chat Messages */
.main-chat-message {
  max-width: 80%;
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 0.9rem;
  line-height: 1.6;
  animation: messageSlide 0.3s ease;
}

@keyframes messageSlide {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.main-chat-message.user {
  background: var(--primary);
  color: var(--darker);
  align-self: flex-end;
  border-bottom-right-radius: 2px;
}

.main-chat-message.bot {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  color: var(--light);
  align-self: flex-start;
  border-bottom-left-radius: 2px;
}

.main-chat-message .msg-time {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  opacity: 0.5;
  margin-top: 6px;
  display: block;
}

.main-chat-message.bot.typing-indicator {
  display: flex;
  gap: 5px;
  padding: 16px 20px;
}

.main-chat-message.bot.typing-indicator span {
  width: 8px;
  height: 8px;
  background: var(--gray);
  border-radius: 50%;
  animation: typingBounce 1.4s infinite;
}

.main-chat-message.bot.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.main-chat-message.bot.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typingBounce {
  0%, 100% { transform: translateY(0); opacity: 0.4; }
  50% { transform: translateY(-6px); opacity: 1; }
}

/* Chat Input */
.main-chat-input {
  display: flex;
  gap: 10px;
  padding: 14px 20px;
  background: rgba(0, 0, 0, 0.3);
  border-top: 1px solid var(--border);
}

.main-chat-input input {
  flex: 1;
  padding: 12px 18px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--darker);
  color: var(--light);
  font-size: 0.9rem;
  font-family: inherit;
  outline: none;
  transition: border-color 0.3s;
}

.main-chat-input input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(0, 229, 160, 0.1);
}

.main-chat-input input::placeholder {
  color: var(--gray);
}

.main-chat-send {
  width: 44px;
  height: 44px;
  border-radius: 6px;
  background: var(--primary);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  color: var(--darker);
}

.main-chat-send:hover {
  box-shadow: 0 0 20px rgba(0, 229, 160, 0.3);
}

.main-chat-send:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.main-chat-send svg {
  width: 20px;
  height: 20px;
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 8px;
  position: relative;
  z-index: 1001;
}

.menu-toggle span {
  width: 22px;
  height: 2px;
  background: var(--light);
  transition: all 0.3s;
  border-radius: 1px;
}

.menu-toggle.active span:nth-child(1) { transform: rotate(45deg) translateY(10px); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: rotate(-45deg) translateY(-10px); }

.menu-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 998;
  backdrop-filter: blur(2px);
}

.menu-overlay.active {
  display: block;
}

/* Responsive */
@media (max-width: 968px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
  }

  .hero-text h1 { font-size: 2.6rem; }
  .hero-buttons { justify-content: center; flex-wrap: wrap; }
  .main-chat-window, .dashboard-preview { max-width: 500px; margin: 0 auto; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .pricing-grid { grid-template-columns: 1fr; gap: 20px; }
  .pricing-card.popular { transform: none; }
  .footer-content { grid-template-columns: repeat(2, 1fr); }
  .section-title h2 { font-size: 1.9rem; }

  .menu-toggle { display: flex; }
  .nav-links {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 260px;
    height: 100vh;
    background: var(--dark);
    flex-direction: column;
    padding: 90px 30px 30px;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    box-shadow: -5px 0 30px rgba(0, 0, 0, 0.4);
    z-index: 999;
    border-left: 1px solid var(--border);
  }
  .nav-links.open { transform: translateX(0); }
  .nav-links a { padding: 14px 0; font-size: 1rem; border-bottom: 1px solid var(--border); }
  nav > .btn { display: none; }
}

@media (max-width: 640px) {
  .hero { padding-top: 100px; min-height: auto; padding-bottom: 60px; }
  .hero-text h1 { font-size: 1.9rem; }
  .hero-buttons { flex-direction: column; width: 100%; }
  .hero-buttons .btn { width: 100%; text-align: center; }
  .main-chat-window { height: 380px; }
  .dashboard-preview { border-radius: 8px; }
  .dash-metrics { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .features, .pricing { padding: 60px 0; }
  .coming-soon { padding: 60px 0; }
  .coming-soon h2 { font-size: 1.9rem; }
  .coming-soon .btn-lg { width: 100%; justify-content: center; }
  footer { padding: 50px 0 30px; }
  .footer-content { grid-template-columns: 1fr; text-align: center; }
  .footer-brand { max-width: 100%; }
  .nav-links { width: 100%; }
}

@media (max-width: 380px) {
  .hero-text h1 { font-size: 1.5rem; }
  .main-chat-window { height: 340px; }
  .btn { padding: 10px 18px; font-size: 0.85rem; }
}