style.css

:root {
  color-scheme: dark;
  --bg: #071114;
  --shell: rgba(13, 19, 22, 0.86);
  --panel: rgba(23, 42, 46, 0.82);
  --panel-strong: rgba(27, 55, 60, 0.92);
  --text: #f7fbff;
  --muted: #b8c2ca;
  --soft: rgba(255, 255, 255, 0.08);
  --line: rgba(94, 242, 226, 0.35);
  --brand: #55eee1;
  --brand-2: #68a5ff;
  --brand-3: #c37aff;
  --bubble-user: #244b6a;
  --bubble-bot: #253b44;
  --shadow: 0 28px 90px rgba(0, 0, 0, 0.42);
}

[data-theme="light"] {
  color-scheme: light;
  --bg: #eef7fb;
  --shell: rgba(255, 255, 255, 0.78);
  --panel: rgba(245, 252, 255, 0.88);
  --panel-strong: rgba(255, 255, 255, 0.94);
  --text: #102027;
  --muted: #52636c;
  --soft: rgba(14, 60, 80, 0.08);
  --line: rgba(39, 168, 180, 0.38);
  --brand: #0db7bd;
  --brand-2: #3d73ff;
  --brand-3: #9c4dcb;
  --bubble-user: #dff0ff;
  --bubble-bot: #eef7f7;
  --shadow: 0 24px 80px rgba(28, 82, 104, 0.22);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  background: radial-gradient(
      circle at 15% 8%,
      rgba(80, 238, 225, 0.23),
      transparent 28rem
    ),
    radial-gradient(
      circle at 88% 18%,
      rgba(195, 122, 255, 0.18),
      transparent 26rem
    ),
    linear-gradient(135deg, #091318 0%, var(--bg) 55%, #10191d 100%);
  color: var(--text);
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  transition: background-color 0.35s ease, color 0.35s ease;
}

[data-theme="light"] body {
  background: radial-gradient(
      circle at 15% 8%,
      rgba(29, 195, 195, 0.22),
      transparent 28rem
    ),
    radial-gradient(
      circle at 88% 18%,
      rgba(117, 126, 255, 0.16),
      transparent 26rem
    ),
    linear-gradient(135deg, #f5fbff 0%, var(--bg) 58%, #e8f5f7 100%);
}

.background-orbit {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
}

.background-orbit span {
  position: absolute;
  width: 34rem;
  aspect-ratio: 1;
  border: 1px solid rgba(85, 238, 225, 0.16);
  border-radius: 44% 56% 58% 42%;
  filter: blur(1px);
  animation: floatSpin 18s linear infinite;
}

.background-orbit span:nth-child(1) {
  left: -12rem;
  top: 12rem;
}

.background-orbit span:nth-child(2) {
  right: -14rem;
  top: 4rem;
  animation-duration: 23s;
}

.background-orbit span:nth-child(3) {
  bottom: -16rem;
  left: 35%;
  animation-duration: 28s;
}

.site-shell {
  width: min(96vw, 1480px);
  min-height: calc(100vh - 32px);
  margin: 16px auto;
  padding: clamp(18px, 3vw, 46px);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: clamp(22px, 4vw, 44px);
  background: linear-gradient(180deg, var(--shell), rgba(9, 15, 18, 0.82));
  box-shadow: var(--shadow);
  backdrop-filter: blur(22px);
  position: relative;
  overflow: hidden;
}

[data-theme="light"] .site-shell {
  background: linear-gradient(180deg, var(--shell), rgba(231, 247, 251, 0.78));
}

.site-shell::after {
  content: "";
  position: absolute;
  inset: 48% 0 0;
  z-index: -1;
  background: linear-gradient(180deg, transparent, rgba(68, 133, 169, 0.18));
}

.app-nav {
  min-height: 48px;
}

.app-nav .container-fluid {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 16px;
}

.navbar-brand {
  color: var(--brand);
  font-size: clamp(1.3rem, 2vw, 1.9rem);
  font-weight: 800;
  letter-spacing: 0;
  text-shadow: 0 0 22px rgba(85, 238, 225, 0.34);
}

.navbar-brand:hover,
.nav-link,
.nav-link:focus {
  color: var(--text);
}

.navbar-nav {
  gap: clamp(10px, 2vw, 38px);
}

.nav-link {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 600;
  transition: color 0.2s ease, transform 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text) !important;
  transform: translateY(-1px);
}

.navbar-toggler {
  grid-column: 3;
  border-color: var(--soft);
}

.navbar-toggler:focus {
  box-shadow: 0 0 0 3px rgba(85, 238, 225, 0.24);
}

.navbar-toggler-icon {
  filter: invert(1);
}

[data-theme="light"] .navbar-toggler-icon {
  filter: none;
}

.nav-actions {
  grid-column: 3;
  display: flex;
  align-items: center;
  gap: 10px;
}

.navbar-collapse {
  grid-column: 1 / -1;
}

.icon-btn,
.send-btn,
.clear-btn,
.demo-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--soft);
  color: var(--text);
  background: rgba(255, 255, 255, 0.05);
  transition: transform 0.22s ease, border-color 0.22s ease,
    background 0.22s ease, box-shadow 0.22s ease;
}

.icon-btn {
  width: 42px;
  height: 42px;
  border-radius: 50%;
}

.icon-btn:hover,
.send-btn:hover,
.clear-btn:hover,
.demo-btn:hover {
  border-color: var(--brand);
  box-shadow: 0 0 26px rgba(85, 238, 225, 0.2);
  transform: translateY(-2px);
}

.icon-btn svg,
.send-btn svg,
.clear-btn svg,
.feature-strip svg {
  width: 18px;
  height: 18px;
}

.hero-section {
  display: grid;
  place-items: center;
  gap: clamp(34px, 5vw, 76px);
  padding: clamp(44px, 3vw, 100px) 0 clamp(26px, 5vw, 60px);
}

.hero-copy {
  width: min(720px, 100%);
  text-align: center;
}

.eyebrow {
  display: inline-block;
  margin-bottom: 16px;
  color: var(--brand);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}

.hero-copy h1 {
  margin: 0;
  font-size: clamp(3rem, 9vw, 6.9rem);
  font-weight: 800;
  line-height: 0.96;
  letter-spacing: 0;
}

.hero-copy h1 span {
  color: var(--brand);
  text-shadow: 0 0 38px rgba(85, 238, 225, 0.42);
}

.hero-copy p {
  width: min(560px, 100%);
  margin: 22px auto 24px;
  color: var(--muted);
  font-size: clamp(0.95rem, 2vw, 1.08rem);
}

.demo-btn {
  min-height: 42px;
  padding: 0 24px;
  border-radius: 999px;
  color: var(--brand);
  font-size: 0.88rem;
  font-weight: 800;
  text-decoration: none;
}

.chat-card {
  width: min(890px, 100%);
  min-height: clamp(500px, 58vh, 660px);
  display: grid;
  grid-template-rows: auto 1fr auto;
  padding: clamp(18px, 2.6vw, 30px);
  border: 1px solid var(--line);
  border-radius: 22px;
  background: linear-gradient(145deg, var(--panel-strong), var(--panel)),
    rgba(10, 24, 28, 0.82);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.28),
    inset 0 0 0 1px rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(18px);
}

.chat-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 16px;
}

.chat-kicker {
  margin: 0 0 4px;
  color: var(--brand);
  font-size: 1.15rem;
  font-weight: 800;
}

.chat-top h2 {
  margin: 0;
  color: var(--text);
  font-size: 1rem;
  font-weight: 700;
}

.clear-btn {
  min-height: 36px;
  gap: 8px;
  padding: 0 14px;
  border-radius: 999px;
  color: var(--brand);
  font-size: 0.82rem;
  font-weight: 700;
}

.chat-messages {
  min-height: 0;
  max-height: 430px;
  padding: 8px 6px 18px;
  overflow-y: auto;
  scrollbar-color: var(--brand) transparent;
}

.message-row {
  display: flex;
  align-items: flex-end;
  gap: 12px;
  margin: 14px 0;
  animation: messageIn 0.36s ease both;
}

.message-row.user {
  justify-content: flex-end;
}

.avatar {
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  color: #052526;
  background: linear-gradient(135deg, var(--brand), #ffffff);
  box-shadow: 0 8px 24px rgba(85, 238, 225, 0.24);
}

.message-row.user .avatar {
  order: 2;
  color: var(--brand);
  background: rgba(255, 255, 255, 0.9);
}

.bubble {
  max-width: min(72%, 660px);
  padding: 13px 15px;
  border-radius: 14px;
  color: var(--text);
  background: var(--bubble-bot);
  border: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 0.92rem;
  line-height: 1.55;
}

.message-row.user .bubble {
  background: var(--bubble-user);
}

.typing {
  display: inline-flex;
  gap: 5px;
  align-items: center;
}

.typing span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--brand);
  animation: typingPulse 1s infinite ease-in-out;
}

.typing span:nth-child(2) {
  animation-delay: 0.14s;
}

.typing span:nth-child(3) {
  animation-delay: 0.28s;
}

.chat-form {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 58px;
  padding: 7px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.1);
  border: 2px solid var(--soft);
}

.chat-form input {
  flex: 1;
  min-width: 0;
  height: 42px;
  border: 0;
  outline: 0;
  color: var(--text);
  background: transparent;
  padding: 0 12px;
  font-size: 0.95rem;
}

.chat-form input::placeholder {
  color: var(--muted);
}

.send-btn {
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
  border-radius: 12px;
  color: #052526;
  border-color: transparent;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
}

.feature-strip {
  width: min(960px, 100%);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 20px auto 0;
}

.feature-strip article {
  min-height: 142px;
  padding: 20px;
  border: 1px solid var(--soft);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.05);
}

.feature-strip svg {
  color: var(--brand);
}

.feature-strip h3 {
  margin: 14px 0 8px;
  font-size: 1rem;
  font-weight: 800;
}

.feature-strip p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

@keyframes floatSpin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes messageIn {
  from {
    opacity: 0;
    transform: translateY(16px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes typingPulse {
  0%,
  80%,
  100% {
    opacity: 0.35;
    transform: translateY(0);
  }
  40% {
    opacity: 1;
    transform: translateY(-4px);
  }
}

@media (max-width: 991px) {
  .app-nav .container-fluid {
    grid-template-columns: 1fr auto auto;
  }

  .nav-actions {
    grid-column: 2;
  }

  .navbar-toggler {
    grid-column: 3;
  }

  .navbar-collapse {
    grid-column: 1 / -1;
    padding-top: 18px;
  }

  .navbar-nav {
    gap: 2px;
  }

  .icon-btn {
    width: 40px;
    height: 40px;
  }
}

@media (max-width: 767px) {
  .site-shell {
    width: min(100vw - 16px, 100%);
    margin: 8px auto;
    min-height: calc(100vh - 16px);
    border-radius: 24px;
  }

  .hero-section {
    padding-top: 34px;
  }

  .chat-card {
    min-height: 560px;
    border-radius: 18px;
  }

  .chat-top {
    align-items: stretch;
    flex-direction: column;
  }

  .clear-btn {
    width: fit-content;
  }

  .bubble {
    max-width: 82%;
    font-size: 0.88rem;
  }

  .avatar {
    width: 30px;
    height: 30px;
  }

  .feature-strip {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 420px) {
  .site-shell {
    padding: 16px;
  }

  .hero-copy h1 {
    font-size: 2.75rem;
  }

  .nav-actions {
    gap: 6px;
  }

  .icon-btn,
  .navbar-toggler {
    width: 36px;
    height: 36px;
  }

  .message-row {
    gap: 8px;
  }

  .bubble {
    max-width: 86%;
    padding: 11px 12px;
  }

  .chat-form input {
    font-size: 0.85rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

.ai-footer {
  position: relative;
  overflow: hidden;
  margin-top: clamp(40px, 8vw, 90px);
  padding: clamp(34px, 6vw, 72px);
  border-radius: 28px;
  background: radial-gradient(
      circle at 20% 90%,
      rgba(85, 238, 225, 0.16),
      transparent 28rem
    ),
    radial-gradient(
      circle at 70% 10%,
      rgba(104, 165, 255, 0.13),
      transparent 24rem
    ),
    linear-gradient(145deg, rgba(8, 14, 17, 0.96), rgba(17, 28, 32, 0.94));
  border: 1px solid rgba(85, 238, 225, 0.18);
  color: var(--text, #f7fbff);
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.3);
}

[data-theme="light"] .ai-footer {
  background: radial-gradient(
      circle at 20% 90%,
      rgba(13, 183, 189, 0.14),
      transparent 28rem
    ),
    radial-gradient(
      circle at 70% 10%,
      rgba(61, 115, 255, 0.12),
      transparent 24rem
    ),
    linear-gradient(145deg, rgba(246, 253, 255, 0.96), rgba(226, 244, 248, 0.9));
}

.footer-glow {
  position: absolute;
  inset: auto 10% -40px;
  height: 120px;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(85, 238, 225, 0.22),
    transparent
  );
  filter: blur(34px);
  pointer-events: none;
}

.footer-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.5fr 0.75fr 0.75fr 1fr;
  gap: clamp(28px, 5vw, 70px);
}

.footer-logo {
  display: inline-block;
  margin-bottom: 10px;
  color: var(--brand, #55eee1);
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1;
  text-decoration: none;
  text-shadow: 0 0 26px rgba(85, 238, 225, 0.35);
}

.footer-brand p,
.footer-contact p {
  max-width: 260px;
  margin: 0;
  color: var(--muted, #b8c2ca);
  line-height: 1.55;
}

.footer-links {
  display: grid;
  gap: 18px;
  align-content: start;
}

.footer-links a,
.footer-contact a {
  width: fit-content;
  color: var(--muted, #b8c2ca);
  font-weight: 600;
  text-decoration: none;
  transition: color 0.25s ease, transform 0.25s ease;
}

.footer-links a:hover,
.footer-contact a:hover {
  color: var(--brand, #55eee1);
  transform: translateX(4px);
}

.footer-bottom {
  position: relative;
  display: grid;
  grid-template-columns: 1.1fr 1.4fr 1fr;
  align-items: end;
  gap: clamp(28px, 5vw, 70px);
  margin-top: clamp(70px, 11vw, 150px);
}

.back-to-top {
  width: fit-content;
  display: inline-flex;
  align-items: center;
  gap: 18px;
  min-height: 58px;
  padding: 8px 10px 8px 24px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text, #f7fbff);
  font-weight: 700;
  transition: transform 0.25s ease, border-color 0.25s ease,
    box-shadow 0.25s ease;
}

.back-to-top i {
  width: 42px;
  height: 42px;
  padding: 10px;
  border-radius: 50%;
  background: #ffffff;
  color: #091318;
}

.back-to-top:hover {
  border-color: var(--brand, #55eee1);
  box-shadow: 0 0 30px rgba(85, 238, 225, 0.18);
  transform: translateY(-3px);
}

.footer-newsletter label {
  display: block;
  margin-bottom: 18px;
  color: var(--text, #f7fbff);
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.08;
}

.newsletter-input {
  display: flex;
  align-items: center;
  max-width: 430px;
  padding: 7px;
  border-radius: 999px;
  background: #ffffff;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.18);
}

.newsletter-input input {
  flex: 1;
  min-width: 0;
  height: 46px;
  border: 0;
  outline: 0;
  padding: 0 18px;
  background: transparent;
  color: #122127;
  font-size: 1rem;
}

.newsletter-input button {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 50%;
  background: #101719;
  color: #ffffff;
  transition: transform 0.25s ease, background 0.25s ease;
}

.newsletter-input button:hover {
  background: linear-gradient(
    135deg,
    var(--brand, #55eee1),
    var(--brand-2, #68a5ff)
  );
  color: #061416;
  transform: rotate(-18deg) scale(1.05);
}

.footer-contact {
  display: grid;
  gap: 36px;
  justify-items: start;
}

@media (max-width: 900px) {
  .footer-grid,
  .footer-bottom {
    grid-template-columns: 1fr 1fr;
  }

  .footer-policy,
  .footer-contact {
    justify-self: start;
  }

  .footer-newsletter {
    grid-column: 1 / -1;
  }
}

@media (max-width: 560px) {
  .ai-footer {
    padding: 28px 22px;
    border-radius: 22px;
  }

  .footer-grid,
  .footer-bottom {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    margin-top: 56px;
  }

  .back-to-top {
    width: 100%;
    justify-content: space-between;
  }

  .newsletter-input {
    max-width: 100%;
  }
}