/* ==========================================================================
   Sl4tex Activity — Design Tokens
   ========================================================================== */

:root {
  /* Brand colors */
  --color-primary: #00A8FF;
  --color-primary-soft: #4FC3FF;
  --color-accent: #FF8A00;
  --color-accent-soft: #FFB35C;

  /* Background system (very dark blue) */
  --color-bg-0: #05070D;
  --color-bg-1: #0A0F1C;
  --color-bg-2: #101828;
  --color-bg-glass: rgba(16, 24, 40, 0.55);

  /* Borders / glass */
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-strong: rgba(0, 168, 255, 0.35);

  /* Text */
  --color-text-primary: #F3F6FB;
  --color-text-secondary: #A9B4C6;
  --color-text-muted: #6B7590;

  /* Glow */
  --glow-primary: 0 0 24px rgba(0, 168, 255, 0.45);
  --glow-accent: 0 0 24px rgba(255, 138, 0, 0.4);

  /* Radii */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-pill: 999px;

  /* Shadows */
  --shadow-soft: 0 8px 30px rgba(0, 0, 0, 0.35);
  --shadow-deep: 0 20px 60px rgba(0, 0, 0, 0.5);

  /* Spacing scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2.5rem;
  --space-6: 4rem;
  --space-7: 6rem;

  /* Typography */
  --font-display: "Space Grotesk", "Inter", system-ui, sans-serif;
  --font-body: "Inter", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", monospace;

  /* Motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 150ms;
  --duration-base: 300ms;
  --duration-slow: 600ms;

  /* Layout */
  --max-width: 1200px;
  --header-height: 76px;
}

/* ==========================================================================
   Reset
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  font-family: var(--font-body);
  background-color: var(--color-bg-0);
  color: var(--color-text-primary);
  line-height: 1.5;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
}

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

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

ul,
ol {
  list-style: none;
}

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* ==========================================================================
   Base typography
   ========================================================================== */

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
}

p {
  color: var(--color-text-secondary);
}

/* ==========================================================================
   Layout primitives
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.section {
  padding-block: var(--space-7);
}

main {
  flex: 1;
}

/* ==========================================================================
   Reusable surfaces
   ========================================================================== */

.glass-panel {
  background: var(--color-bg-glass);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  box-shadow: var(--shadow-soft);
}

.ambient-glow {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(600px circle at 20% 10%, rgba(0, 168, 255, 0.12), transparent 60%),
    radial-gradient(500px circle at 80% 30%, rgba(255, 138, 0, 0.10), transparent 60%);
  z-index: 0;
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
  transition: transform var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-base) var(--ease-out),
              background-color var(--duration-base) var(--ease-out);
  white-space: nowrap;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn--primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-soft));
  color: #04121F;
  box-shadow: var(--glow-primary);
}

.btn--primary:hover {
  box-shadow: 0 0 32px rgba(0, 168, 255, 0.65);
}

.btn--secondary {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
}

.btn--secondary:hover {
  border-color: var(--color-border-strong);
  background: rgba(0, 168, 255, 0.08);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-height);
  display: flex;
  align-items: center;
  background: rgba(5, 7, 13, 0.6);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.brand__mark {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  box-shadow: var(--glow-primary);
}

.brand__name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.site-nav__link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--duration-fast) var(--ease-out);
}

.site-nav__link:hover {
  color: var(--color-text-primary);
}

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

.hero {
  position: relative;
  padding-block: var(--space-7) var(--space-7);
  overflow: hidden;
}

.hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
  gap: var(--space-6);
  min-height: calc(100vh - var(--header-height) - 6rem);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-pill);
  background: rgba(0, 168, 255, 0.08);
  border: 1px solid var(--color-border-strong);
  color: var(--color-primary-soft);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  margin-bottom: var(--space-4);
}

.eyebrow__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: var(--glow-accent);
}

.hero__title {
  font-size: clamp(2.75rem, 6vw, 4.5rem);
  margin-bottom: var(--space-4);
}

.hero__subtitle {
  max-width: 42ch;
  font-size: clamp(1.05rem, 1.6vw, 1.2rem);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-5);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.download-notice {
  margin-top: var(--space-3);
  max-width: 42ch;
  font-size: 0.85rem;
  font-family: var(--font-mono);
  color: var(--color-accent-soft);
  opacity: 0;
  height: 0;
  overflow: hidden;
  transition: opacity var(--duration-base) var(--ease-out);
}

.download-notice.is-visible {
  opacity: 1;
  height: auto;
}

/* ---- Presence preview card (signature element) ---- */

.hero__visual {
  position: relative;
  display: flex;
  justify-content: center;
}

.presence-card {
  width: 100%;
  max-width: 360px;
  padding: var(--space-4);
  animation: float 6s ease-in-out infinite;
}

.presence-card__header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border);
}

.presence-card__status {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #23D18B;
  box-shadow: 0 0 10px rgba(35, 209, 139, 0.7);
}

.presence-card__label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.presence-card__body {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.presence-card__icon {
  position: relative;
  width: 56px;
  height: 56px;
  flex-shrink: 0;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
}

.presence-card__icon-glow {
  position: absolute;
  inset: -6px;
  border-radius: calc(var(--radius-md) + 6px);
  background: inherit;
  filter: blur(14px);
  opacity: 0.55;
  z-index: -1;
}

.presence-card__title {
  color: var(--color-text-primary);
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 0.15rem;
}

.presence-card__detail {
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  margin-bottom: 0.3rem;
}

.presence-card__timer {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-primary-soft);
}

.presence-card__bar {
  height: 4px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.06);
  overflow: hidden;
}

.presence-card__bar-fill {
  display: block;
  height: 100%;
  width: 35%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
}

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

/* ==========================================================================
   Contact page
   ========================================================================== */

.contact {
  position: relative;
  padding-block: var(--space-7);
  overflow: hidden;
}

.contact__inner {
  position: relative;
  z-index: 1;
  max-width: 640px;
}

.contact__title {
  font-size: clamp(2.25rem, 4.5vw, 3rem);
  margin-bottom: var(--space-3);
}

.contact__subtitle {
  margin-bottom: var(--space-5);
}

.contact-card {
  padding: var(--space-5);
}

.contact-card__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding-block: var(--space-3);
}

.contact-card__row + .contact-card__row {
  border-top: 1px solid var(--color-border);
}

.contact-card__label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.contact-card__value {
  font-weight: 600;
  font-size: 0.95rem;
}

.contact-card__value--link {
  color: var(--color-primary-soft);
  transition: color var(--duration-fast) var(--ease-out);
}

.contact-card__value--link:hover {
  color: var(--color-primary);
}

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

.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-4);
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.site-footer__links {
  display: flex;
  gap: var(--space-4);
}

.site-footer__links a {
  transition: color var(--duration-fast) var(--ease-out);
}

.site-footer__links a:hover {
  color: var(--color-primary-soft);
}

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

@media (max-width: 900px) {
  .hero__inner {
    grid-template-columns: 1fr;
    min-height: auto;
    text-align: center;
  }

  .hero__subtitle {
    margin-inline: auto;
  }

  .hero__actions {
    justify-content: center;
  }

  .download-notice {
    margin-inline: auto;
  }

  .hero__visual {
    margin-top: var(--space-5);
  }

  .contact-card__row {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-1);
  }
}

@media (max-width: 600px) {
  .site-footer__inner {
    flex-direction: column;
    align-items: flex-start;
  }
}