/* ==========================================================================
   Lidora Linux — Design Tokens
   Palette: near-black indigo hero, cool light content, signal-violet accent
   Type: Space Grotesk (display) / IBM Plex Sans (body) / IBM Plex Mono (labels)
   ========================================================================== */

:root {
  /* Color */
  --bg-dark: #0a0b12;
  --bg-dark-2: #12131f;
  --bg-light: #eef0f4;
  --ink: #f5f4f2;
  --ink-muted: #a9adc0;
  --text-dark: #14151c;
  --text-muted: #5c6072;
  --accent: #6c63ff;
  --accent-strong: #857cff;
  --accent-soft: rgba(108, 99, 255, 0.12);
  --accent-soft-border: rgba(108, 99, 255, 0.35);
  --warm: #ffb454;
  --line: rgba(255, 255, 255, 0.12);
  --line-dark: rgba(20, 21, 28, 0.12);

  /* Type */
  --font-display: "Space Grotesk", sans-serif;
  --font-body: "IBM Plex Sans", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;

  /* Layout */
  --nav-height: 76px;
  --container: 760px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  * {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

body {
  margin: 0;
  background: var(--bg-light);
  color: var(--text-dark);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

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

button {
  font-family: inherit;
}

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

/* ==========================================================================
   Nav
   ========================================================================== */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background 0.35s ease, border-color 0.35s ease, backdrop-filter 0.35s ease;
}

.nav--scrolled {
  background: rgba(10, 11, 18, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.nav--on-light.nav--scrolled {
  background: rgba(238, 240, 244, 0.9);
  border-bottom: 1px solid var(--line-dark);
}

.nav__inner {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
  opacity: 0;
  transform: translateY(-4px);
  pointer-events: none;
  transition: opacity 0.35s ease, transform 0.35s ease;
}

.nav--on-light .nav__brand {
  color: var(--text-dark);
}

.nav--scrolled .nav__brand {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.nav__logo {
  height: 28px;
  width: auto;
  max-width: 150px;
  object-fit: contain;
}

.nav--on-light .nav__logo {
  filter: invert(1);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-left: auto;
}

.nav__link {
  font-size: 0.92rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--ink);
  opacity: 0.85;
  transition: opacity 0.2s ease;
}

.nav--on-light .nav__link {
  color: var(--text-dark);
}

.nav__link:hover {
  opacity: 1;
}

.nav__lang {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--ink-muted);
}

.nav--on-light .nav__lang {
  color: var(--text-muted);
}

.nav__lang-link {
  text-decoration: none;
  color: inherit;
  padding: 2px 4px;
}

.nav__lang-link[aria-current="true"] {
  color: var(--accent-strong);
  font-weight: 600;
}

/* ==========================================================================
   Hero
   ========================================================================== */

.hero {
  position: relative;
  height: 100vh;
  min-height: 560px;
  overflow: hidden;
  background: var(--bg-dark);
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero__canvas {
  position: absolute;
  inset: 0;
  background: radial-gradient(120% 100% at 50% 30%, #1a1c33 0%, #0a0b12 70%);
}

.hero__canvas canvas {
  display: block;
  mix-blend-mode: luminosity;
  opacity: 0.6;
  filter: contrast(1.03);
}

.hero__content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 0 24px;
  max-width: 720px;
}

.hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.02em;
  color: var(--ink-muted);
  margin: 0 0 24px;
}

.hero__logo {
  width: min(420px, 78vw);
  height: auto;
  margin: 0 auto;
  object-fit: contain;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.hero__tagline {
  display: inline-block;
  margin-top: 24px;
  padding: 10px 22px;
  border-radius: 999px;
  background: var(--accent-soft);
  border: 1px solid var(--accent-soft-border);
  color: var(--ink);
  font-size: 1rem;
  font-weight: 500;
}

.hero__scroll-cue {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 32px;
  border: 1.5px solid var(--ink-muted);
  border-radius: 10px;
  z-index: 2;
}

.hero__scroll-cue span {
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  width: 3px;
  height: 6px;
  border-radius: 2px;
  background: var(--ink-muted);
  animation: scroll-cue 1.8s ease infinite;
}

@keyframes scroll-cue {
  0% { opacity: 1; top: 6px; }
  70% { opacity: 0; top: 16px; }
  100% { opacity: 0; top: 6px; }
}

/* ==========================================================================
   Content sections (Who / Survey)
   ========================================================================== */

.content {
  background: var(--bg-light);
  padding: 96px 24px 120px;
}

.content__inner {
  max-width: var(--container);
  margin: 0 auto;
}

.content--tight .content__inner {
  max-width: 560px;
}

.content h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 4vw, 2.6rem);
  letter-spacing: -0.01em;
  margin: 0 0 40px;
}

.content p {
  font-size: 1.05rem;
  color: var(--text-dark);
  margin: 0 0 22px;
}

.content p:last-of-type {
  margin-bottom: 0;
}

.content__cta {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--line-dark);
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--text-dark);
  color: var(--bg-light);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 13px 24px;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.15s ease;
}

.button:hover {
  background: var(--accent);
  transform: translateY(-1px);
}

.button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}

/* ==========================================================================
   Survey
   ========================================================================== */

.survey-intro {
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.survey-sub {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 32px;
}

.tag-field {
  border: 1.5px solid var(--line-dark);
  border-radius: 14px;
  background: #fff;
  padding: 14px 16px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  transition: border-color 0.2s ease;
}

.tag-field:focus-within {
  border-color: var(--accent);
}

.tag-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent-soft);
  border: 1px solid var(--accent-soft-border);
  color: var(--text-dark);
  font-family: var(--font-mono);
  font-size: 0.86rem;
  padding: 5px 6px 5px 12px;
  border-radius: 999px;
}

.tag-chip__remove {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1;
  padding: 4px 6px;
  border-radius: 999px;
}

.tag-chip__remove:hover {
  background: rgba(0, 0, 0, 0.08);
  color: var(--text-dark);
}

.tag-field__input {
  flex: 1 1 160px;
  min-width: 140px;
  border: none;
  outline: none;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  padding: 8px 4px;
  background: transparent;
  color: var(--text-dark);
}

.survey-hint {
  margin-top: 10px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.survey-error {
  margin-top: 16px;
  font-size: 0.9rem;
  color: #b3261e;
}

.survey-error[hidden],
.survey-thanks[hidden] {
  display: none;
}

.survey-thanks {
  padding: 28px;
  background: var(--accent-soft);
  border: 1px solid var(--accent-soft-border);
  border-radius: 14px;
  font-size: 1rem;
}

.survey-form__submit {
  margin-top: 24px;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
  background: var(--bg-light);
  border-top: 1px solid var(--line-dark);
  padding: 24px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.footer__based-on {
  display: inline-flex;
  align-items: center;
  gap: 14px;
}

.footer__suse-logo {
  height: 32px;
  width: auto;
  object-fit: contain;
  vertical-align: middle;
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 640px) {
  .nav__inner {
    gap: 16px;
    padding: 0 16px;
  }
  .nav__links {
    gap: 16px;
  }
  .content {
    padding: 72px 20px 88px;
  }
}