:root {
  --color-primary: #4da3ff;
  --color-bg: #ffffff;
  --color-text: #1d1d1f;
  --color-border: #d9e2ec;
  --color-muted-text: #5b6470;
  --color-surface: #f8fbff;
  --color-primary-hover: #2f90f3;
  --focus-ring: 0 0 0 3px rgba(77, 163, 255, 0.35);

  --font-sans:
    "Quicksand", "Inter", "Segoe UI", "SF Pro Text", "Helvetica Neue", Arial,
    sans-serif;
  --font-size-base: 16px;
  --line-height-base: 1.6;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;

  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
}

body {
  height: 100dvh;
  margin: 0;
  font-family: var(--font-sans);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background: var(--color-bg);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-primary);
  text-decoration-color: color-mix(in srgb, var(--color-primary) 55%, transparent);
  text-underline-offset: 0.15em;
}

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

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: var(--radius-sm);
}

#app {
  height: 100dvh;
  overflow-y: auto;
  scroll-snap-type: y mandatory;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  padding: var(--space-4) var(--space-5);
  background: var(--color-bg);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: 0;
  /* border-bottom: 1px solid var(--color-border); */
}

.brand {
  text-decoration: none;
}

/* Logo wordmark styling */
.logo {
  display: flex;
  align-items: center;
  font-size: 40px;
  letter-spacing: 1px;
}

.text {
  color: #1d1d1f;
  font-weight: 800;
}

/* Glowing O */
.glow-o {
  position: relative;
  margin: 0 1px;
  color: #4da3ff;
  -webkit-text-stroke: 2px #4da3ff;
  font-size: 40px;
  font-weight: 400;
  line-height: 1;
  text-shadow:
    0 0 6px rgba(77, 163, 255, 0.45),
    0 0 14px rgba(30, 144, 255, 0.35);
}

/* Outer glow */
/* .glow-o::before {
  content: "O";
  position: absolute;
  left: 0;
  top: 0;
  color: transparent;
  -webkit-text-stroke: 2px #4da3ff;
  filter: blur(4px);
  opacity: 0.65;
} */

/* Strong glow layer */
/* .glow-o::after {
  content: "O";
  position: absolute;
  left: 0;
  top: 0;
  color: transparent;
  -webkit-text-stroke: 3px #1e90ff;
  filter: blur(9px);
  opacity: 0.55;
} */

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-links a {
  color: var(--color-muted-text);
  text-decoration: none;
  font-weight: 600;
}

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

.page-section {
  position: relative;
  min-height: 100dvh;
  scroll-snap-align: start;
  scroll-snap-stop: always;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-7) var(--space-5);
  background: #ffffff;
}

.hero {
  gap: var(--space-4);
}

.hero-title {
  margin: 0;
  font-size: clamp(2rem, 4.3vw, 4rem);
  line-height: 1.2;
  font-weight: 700;
  color: var(--color-text);
}

.gradient-primary {
  background: linear-gradient(90deg, #4da3ff 0%, #5b4dff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.switch-wrap {
  display: inline-grid;
  margin-left: 0.2ch;
  vertical-align: baseline;
}

.switch-word {
  grid-area: 1 / 1;
  justify-self: start;
  width: max-content;
  text-align: left;
  white-space: nowrap;
  font-weight: 800;
  opacity: 0;
  filter: blur(2px);
  animation: switchWordPrimary 10s ease-in-out infinite;
}

.switch-word:nth-child(2) {
  animation-name: switchWordSecondary;
}

.hero-subtitle {
  margin: 0;
  font-size: clamp(1.5rem, 3vw, 2.4rem);
  line-height: 1.3;
  font-weight: 700;
  color: var(--color-text);
}

.hero-description {
  width: min(940px, 100%);
  margin: 0;
  font-size: clamp(1rem, 1.6vw, 1.2rem);
  color: var(--color-muted-text);
}

.hero-services {
  margin: var(--space-2) 0 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.55rem 0.7rem;
  font-size: clamp(1rem, 1.65vw, 1.22rem);
  font-weight: 600;
  color: var(--color-text);
}

.service-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.03em;
  padding: 0.32rem 0.78rem;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--color-primary) 20%, #ffffff 80%);
  background: color-mix(in srgb, var(--color-primary) 5%, #ffffff 95%);
}

.hero-icons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  margin-top: var(--space-2);
}

.hero-icon {
  width: 2.1rem;
  height: 2.1rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  font-size: 1.05rem;
  line-height: 1;
}

.hero-icon i {
  color: var(--color-primary);
  font-size: 0.95rem;
}

.service-o {
  font-size: 1em;
  -webkit-text-stroke: 1.4px #4da3ff;
  vertical-align: baseline;
  margin: 0 0.01em;
}

.mobile-section {
  text-align: left;
}

.software-section {
  text-align: left;
}

.ai-section {
  text-align: left;
}

.website-section {
  text-align: left;
}

.section-content {
  width: min(860px, 100%);
}

.section-eyebrow {
  margin: 0 0 0.45rem;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
}

.section-title {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.25rem);
  line-height: 1.2;
  color: var(--color-text);
}

.section-oneliner {
  margin: 0.85rem 0 0;
  font-size: clamp(1.06rem, 1.8vw, 1.3rem);
  color: var(--color-muted-text);
}

.feature-list {
  margin: 1.3rem 0 0;
  padding-left: 1.2rem;
  display: grid;
  gap: 0.65rem;
  color: var(--color-text);
}

.feature-list li::marker {
  color: var(--color-primary);
}

.best-for {
  margin: 1.35rem 0 0;
  padding: 0.78rem 0.95rem;
  border-radius: var(--radius-md);
  border: 1px solid color-mix(in srgb, var(--color-primary) 22%, #ffffff 78%);
  background: color-mix(in srgb, var(--color-primary) 6%, #ffffff 94%);
  color: var(--color-text);
}

.best-for-label {
  font-weight: 700;
  color: var(--color-primary);
}

.scroll-indicator {
  position: absolute;
  left: 50%;
  bottom: var(--space-4);
  transform: translateX(-50%);
  display: inline-flex;
  pointer-events: none;
}

.scroll-pill {
  width: 1.6rem;
  height: 3.1rem;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--color-primary) 55%, #ffffff 45%);
  background: color-mix(in srgb, var(--color-primary) 8%, #ffffff 92%);
  display: inline-flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 0.45rem;
  box-shadow: 0 8px 18px rgba(77, 163, 255, 0.15);
}

.scroll-pill i {
  font-size: 0.72rem;
  color: var(--color-primary);
  animation: floatArrowDown 1.5s ease-in-out infinite;
}

@keyframes switchWordPrimary {
  0%,
  46% {
    opacity: 1;
    filter: blur(0);
  }
  52%,
  94% {
    opacity: 0;
    filter: blur(2px);
  }
  100% {
    opacity: 1;
    filter: blur(0);
  }
}

@keyframes switchWordSecondary {
  0%,
  46% {
    opacity: 0;
    filter: blur(2px);
  }
  52%,
  94% {
    opacity: 1;
    filter: blur(0);
  }
  100% {
    opacity: 0;
    filter: blur(2px);
  }
}

@keyframes floatArrowDown {
  0%,
  100% {
    transform: translateY(0);
    opacity: 0.7;
  }
  50% {
    transform: translateY(11px);
    opacity: 1;
  }
}

@media (max-width: 720px) {
  .site-header {
    padding: 0.75rem 1rem;
  }

  .navbar {
    justify-content: center;
  }

  .logo {
    font-size: 2rem;
  }

  .glow-o {
    font-size: 2rem;
    -webkit-text-stroke: 1.5px #4da3ff;
  }

  .nav-links {
    display: none;
  }

  .page-section {
    min-height: 100dvh;
    padding: 5.3rem 0.95rem 4.25rem;
  }

  .hero {
    gap: 0.9rem;
  }

  .hero-title {
    font-size: clamp(1.7rem, 8.4vw, 2.35rem);
    line-height: 1.18;
    max-width: 14ch;
  }

  .switch-wrap {
    margin-left: 0.12ch;
  }

  .hero-subtitle {
    font-size: clamp(1.15rem, 5.4vw, 1.45rem);
    line-height: 1.28;
    max-width: 20ch;
  }

  .hero-description {
    font-size: 0.94rem;
    line-height: 1.55;
    max-width: 35ch;
  }

  .hero-services {
    gap: 0.45rem 0.55rem;
    font-size: 0.9rem;
  }

  .service-pill {
    padding: 0.24rem 0.62rem;
  }

  .hero-icons {
    gap: 0.5rem;
    margin-top: 0.2rem;
  }

  .hero-icon {
    width: 1.9rem;
    height: 1.9rem;
  }

  .hero-icon i {
    font-size: 0.86rem;
  }

  .mobile-section,
  .software-section,
  .ai-section,
  .website-section {
    text-align: left;
    justify-content: flex-start;
  }

  .section-content {
    width: 100%;
    max-width: 34rem;
  }

  .section-title {
    font-size: clamp(1.38rem, 7.2vw, 1.95rem);
    line-height: 1.22;
  }

  .section-oneliner {
    margin-top: 0.55rem;
    font-size: 0.93rem;
    line-height: 1.5;
  }

  .feature-list {
    margin-top: 0.85rem;
    padding-left: 1rem;
    list-style-position: outside;
    gap: 0.42rem;
    font-size: 0.9rem;
    line-height: 1.4;
  }

  .best-for {
    margin-top: 0.95rem;
    font-size: 0.86rem;
    line-height: 1.4;
    padding: 0.66rem 0.72rem;
  }

  .scroll-indicator {
    bottom: 0.8rem;
  }

  .scroll-pill {
    width: 1.35rem;
    height: 2.5rem;
    padding-top: 0.3rem;
  }

  .scroll-pill i {
    font-size: 0.62rem;
  }
}

@media (max-width: 420px) {
  .hero-title {
    font-size: clamp(1.55rem, 9vw, 2rem);
    max-width: 12.5ch;
  }

  .hero-subtitle {
    font-size: 1.06rem;
  }

  .hero-description {
    font-size: 0.9rem;
    max-width: 32ch;
  }

  .hero-services {
    font-size: 0.84rem;
    gap: 0.4rem 0.5rem;
  }

  .service-pill {
    padding: 0.22rem 0.56rem;
  }

  .feature-list {
    font-size: 0.84rem;
    gap: 0.36rem;
  }

  .best-for {
    font-size: 0.8rem;
    padding: 0.58rem 0.64rem;
  }
}

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