/* SurvyAI marketing site — mirrors desktop GUI (styles.py / branding.py) */

:root {
  --blue-50: #eff6ff;
  --blue-100: #dbeafe;
  --blue-200: #bfdbfe;
  --blue-400: #60a5fa;
  --blue-500: #3b82f6;
  --blue-600: #2563eb;
  --blue-700: #1d4ed8;
  --blue-800: #1e40af;
  --slate-50: #f8fafc;
  --slate-100: #f1f5f9;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-400: #94a3b8;
  --slate-500: #64748b;
  --slate-600: #475569;
  --slate-700: #334155;
  --slate-900: #0f172a;
  --bg: #f4f6fa;
  --surface: #ffffff;
  --radius: 12px;
  --radius-lg: 16px;
  --shadow: 0 1px 2px rgb(15 23 42 / 0.04), 0 12px 32px rgb(15 23 42 / 0.06);
  --font: "IBM Plex Sans", "Segoe UI Variable", "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", "Cascadia Mono", Consolas, monospace;
  --max: 1100px;
  --nav-h: 4.25rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--slate-900);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: var(--blue-700);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--blue-600);
}

:focus-visible {
  outline: 2px solid var(--blue-500);
  outline-offset: 3px;
}

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--surface);
  padding: 0.75rem 1rem;
  z-index: 100;
}

.skip:focus {
  left: 1rem;
  top: 1rem;
}

/* —— Nav —— */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  backdrop-filter: blur(12px);
  background: rgb(244 246 250 / 0.88);
  border-bottom: 1px solid var(--slate-200);
}

.nav__inner,
.wrap {
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: inherit;
  text-decoration: none;
}

.brand__mark {
  width: 2rem;
  height: 2rem;
  flex-shrink: 0;
}

.brand__word {
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
}

.brand__word span {
  color: var(--blue-600);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 0.25rem 1.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav__links a {
  color: var(--slate-600);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
}

.nav__links a:hover {
  color: var(--slate-900);
}

.nav__toggle {
  display: none;
  border: 1px solid var(--slate-300);
  background: var(--surface);
  border-radius: 10px;
  width: 2.5rem;
  height: 2.5rem;
  cursor: pointer;
}

.nav__toggle span {
  display: block;
  width: 1rem;
  height: 2px;
  margin: 0.28rem auto;
  background: var(--slate-700);
  border-radius: 1px;
}

/* —— Buttons —— */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 2.75rem;
  padding: 0.7rem 1.25rem;
  border-radius: 10px;
  border: 1px solid transparent;
  font: inherit;
  font-size: 0.9375rem;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.btn--primary {
  background: var(--blue-600);
  border-color: var(--blue-700);
  color: #fff;
}

.btn--primary:hover {
  background: var(--blue-700);
  color: #fff;
}

.btn--ghost {
  background: var(--surface);
  border-color: var(--slate-300);
  color: var(--slate-700);
}

.btn--ghost:hover {
  border-color: var(--slate-400);
  color: var(--slate-900);
}

.btn--lg {
  min-height: 3.15rem;
  padding-inline: 1.5rem;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* —— Hero —— */
.hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(3.5rem, 8vw, 6.5rem) 0 clamp(4rem, 9vw, 7rem);
  min-height: calc(100svh - var(--nav-h));
  display: flex;
  align-items: center;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 70% 55% at 78% 18%, rgb(37 99 235 / 0.16), transparent 60%),
    radial-gradient(ellipse 50% 40% at 12% 88%, rgb(59 130 246 / 0.1), transparent 55%),
    linear-gradient(180deg, #eef3fb 0%, var(--bg) 72%);
}

.hero__grid {
  position: absolute;
  inset: 0;
  z-index: -1;
  opacity: 0.35;
  background-image:
    linear-gradient(rgb(37 99 235 / 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgb(37 99 235 / 0.07) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 70% 65% at 70% 35%, #000 20%, transparent 75%);
}

.hero__crosshair {
  position: absolute;
  right: max(4%, calc(50% - 28rem));
  top: 18%;
  width: min(42vw, 22rem);
  aspect-ratio: 1;
  border: 1px solid rgb(37 99 235 / 0.18);
  border-radius: 50%;
  z-index: -1;
  pointer-events: none;
}

.hero__crosshair::before,
.hero__crosshair::after {
  content: "";
  position: absolute;
  background: rgb(37 99 235 / 0.2);
}

.hero__crosshair::before {
  left: 8%;
  right: 8%;
  top: 50%;
  height: 1px;
}

.hero__crosshair::after {
  top: 8%;
  bottom: 8%;
  left: 50%;
  width: 1px;
}

.hero__content {
  max-width: 38rem;
}

.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(2.75rem, 7vw, 4.25rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.05;
}

.hero h1 span {
  color: var(--blue-600);
}

.hero__lead {
  margin: 0 0 1.75rem;
  font-size: clamp(1.05rem, 2.2vw, 1.2rem);
  color: var(--slate-600);
  max-width: 32rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 1.25rem;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--blue-200);
  background: var(--blue-50);
  color: var(--blue-800);
  font-size: 0.8125rem;
  font-weight: 600;
}

.badge::before {
  content: "";
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: var(--blue-600);
}

/* —— Sections —— */
.section {
  padding: clamp(3.5rem, 7vw, 5.5rem) 0;
}

.section--alt {
  background: var(--surface);
  border-block: 1px solid var(--slate-200);
}

.section__head {
  max-width: 36rem;
  margin-bottom: 2rem;
}

.section__eyebrow {
  margin: 0 0 0.5rem;
  color: var(--blue-700);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.section h2 {
  margin: 0 0 0.65rem;
  font-size: clamp(1.75rem, 3.5vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.section__head p {
  margin: 0;
  color: var(--slate-500);
}

/* Capability strip — not cards in hero; interaction-adjacent list */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.feature {
  padding: 0.25rem 0;
}

.feature h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.feature p {
  margin: 0;
  color: var(--slate-500);
  font-size: 0.95rem;
}

/* Download / Updates panels — interaction containers */
.panel {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 1.5rem;
  padding: 1.75rem;
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.panel--invert {
  background: linear-gradient(145deg, #0f172a 0%, #172554 55%, #1e3a8a 100%);
  border-color: transparent;
  color: #f8fafc;
}

.panel--invert .muted,
.panel--invert .meta {
  color: rgb(226 232 240 / 0.78);
}

.panel h3 {
  margin: 0 0 0.5rem;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.panel p {
  margin: 0 0 1.25rem;
}

.muted {
  color: var(--slate-500);
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  margin: 0 0 1.25rem;
  font-size: 0.875rem;
  color: var(--slate-500);
}

.meta code,
.code {
  font-family: var(--mono);
  font-size: 0.8125rem;
  padding: 0.15rem 0.4rem;
  border-radius: 6px;
  background: var(--slate-100);
  color: var(--slate-700);
  border: 1px solid var(--slate-200);
}

.panel--invert .code {
  background: rgb(255 255 255 / 0.08);
  border-color: rgb(255 255 255 / 0.14);
  color: #e2e8f0;
}

.panel__aside {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.75rem;
  padding: 1.25rem;
  border-radius: var(--radius);
  background: var(--slate-50);
  border: 1px solid var(--slate-200);
}

.panel--invert .panel__aside {
  background: rgb(255 255 255 / 0.06);
  border-color: rgb(255 255 255 / 0.12);
}

.kv {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.35rem 0.85rem;
  margin: 0;
  font-size: 0.875rem;
}

.kv dt {
  color: var(--slate-500);
  font-weight: 500;
}

.panel--invert .kv dt {
  color: rgb(226 232 240 / 0.65);
}

.kv dd {
  margin: 0;
  font-weight: 600;
}

.note {
  margin-top: 1rem;
  padding: 0.9rem 1rem;
  border-radius: 10px;
  border: 1px solid var(--blue-200);
  background: var(--blue-50);
  color: var(--blue-800);
  font-size: 0.9rem;
}

.note strong {
  font-weight: 700;
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 2rem;
  align-items: start;
}

.about-grid p {
  margin: 0 0 1rem;
  color: var(--slate-600);
}

.about-grid p:last-child {
  margin-bottom: 0;
}

.stat-list {
  margin: 0;
  padding: 1.25rem 1.35rem;
  list-style: none;
  border-left: 3px solid var(--blue-600);
  background: var(--blue-50);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.stat-list li + li {
  margin-top: 0.85rem;
}

.stat-list strong {
  display: block;
  font-size: 0.95rem;
  color: var(--slate-900);
}

.stat-list span {
  color: var(--slate-500);
  font-size: 0.875rem;
}

/* Contact */
.contact-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  align-items: center;
}

.contact-mail {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.85rem 1.15rem;
  border-radius: var(--radius);
  border: 1px solid var(--slate-200);
  background: var(--surface);
  color: var(--slate-900);
  text-decoration: none;
  font-weight: 600;
  box-shadow: var(--shadow);
}

.contact-mail:hover {
  border-color: var(--blue-200);
  color: var(--blue-700);
}

.contact-mail small {
  display: block;
  font-weight: 500;
  color: var(--slate-500);
  font-size: 0.8rem;
}

/* Footer */
.footer {
  padding: 2rem 0 2.5rem;
  border-top: 1px solid var(--slate-200);
  color: var(--slate-500);
  font-size: 0.875rem;
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
}

.footer a {
  color: var(--slate-600);
  text-decoration: none;
}

.footer a:hover {
  color: var(--blue-700);
}

/* Motion */
@media (prefers-reduced-motion: no-preference) {
  .hero__content {
    animation: rise 0.7s ease both;
  }

  .hero__crosshair {
    animation: pulse-ring 8s ease-in-out infinite;
  }

  .badge {
    animation: rise 0.55s ease both;
  }

  @keyframes rise {
    from {
      opacity: 0;
      transform: translateY(12px);
    }
    to {
      opacity: 1;
      transform: none;
    }
  }

  @keyframes pulse-ring {
    0%,
    100% {
      transform: scale(1);
      opacity: 1;
    }
    50% {
      transform: scale(1.03);
      opacity: 0.75;
    }
  }
}

/* Responsive */
@media (max-width: 860px) {
  .features,
  .panel,
  .about-grid {
    grid-template-columns: 1fr;
  }

  .nav__toggle {
    display: inline-block;
  }

  .nav__links {
    display: none;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.75rem 1.25rem 1rem;
    background: var(--surface);
    border-bottom: 1px solid var(--slate-200);
  }

  .nav__links.is-open {
    display: flex;
  }

  .nav__links a {
    padding: 0.75rem 0.25rem;
  }

  .nav__links .btn {
    margin-top: 0.35rem;
    width: 100%;
  }

  .hero {
    min-height: auto;
    padding-top: 3rem;
  }

  .hero__crosshair {
    opacity: 0.45;
    right: -10%;
    top: 8%;
  }
}