/* ════════════════════════════════════════════
   DESIGN TOKENS — single source of truth
════════════════════════════════════════════ */
:root {
  /* ── Core palette ── */
  --color-bg:            #0b1120;
  --color-bg-alt:        #0f1829;
  --color-surface:       #121e33;
  --color-border:        #1e3050;
  --color-primary:       #00d4ff;
  --color-primary-2:     #0094b3;
  --color-accent:        #0052cc;
  --color-text:          #cdd8f0;
  --color-text-muted:    #7a94bb;
  --color-white:         #ffffff;

  /* ── Light-section palette (Features & Pricing) ── */
  --color-light-bg:      #f0f6ff;
  --color-light-surface: #ffffff;
  --color-light-border:  #d0dff0;
  --color-light-text:    #1a2540;
  --color-light-muted:   #4a6080;

  /* ── Typography – families ── */
  --font-display: 'Exo 2', sans-serif;
  --font-mono:    'Space Mono', monospace;

  /* ── Typography – sizes ── */
  --font-size-base:        1rem;          /* 16px */
  --font-size-sm:          0.88rem;
  --font-size-xs:          0.82rem;
  --font-size-nav-link:    0.9rem;
  --font-size-nav-logo:    1.1rem;        /* logo text — kept separate */
  --font-size-section-intro: 1.05rem;
  --font-size-card-text:   0.95rem;
  --font-size-btn:         0.95rem;
  --font-size-footer:      0.85rem;

  /* ── Spacing ── */
  --section-py: 100px;
  --container:  1160px;

  /* ── Radius ── */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  /* ── Transitions ── */
  --transition: 0.25s ease;
}

/* ════════════════════════════════════════════
   RESET & BASE
════════════════════════════════════════════ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: var(--font-size-base);
  font-weight: 300;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a   { color: inherit; text-decoration: none; }
ul  { list-style: none; }

/* ════════════════════════════════════════════
   UTILITIES
════════════════════════════════════════════ */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: var(--section-py) 0;
}

.section__title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section__intro {
  color: var(--color-text-muted);
  /* max-width: 680px; */
  margin-bottom: 16px;
  font-size: var(--font-size-section-intro);
}

/* ════════════════════════════════════════════
   BUTTONS
════════════════════════════════════════════ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-size: var(--font-size-btn);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: 2px solid transparent;
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-bg);
}
.btn--primary:hover {
  background: #00eeff;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 212, 255, 0.3);
}

.btn--outline {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: transparent;
}
.btn--outline:hover {
  background: rgba(0, 212, 255, 0.1);
}

/* ════════════════════════════════════════════
   NAVIGATION
════════════════════════════════════════════ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 18px 0;
  transition: background var(--transition), padding var(--transition), box-shadow var(--transition);
}

.nav.scrolled {
  background: rgba(11, 17, 32, 0.95);
  backdrop-filter: blur(12px);
  padding: 12px 0;
  box-shadow: 0 2px 24px rgba(0,0,0,0.4);
}

.nav__inner {
  display: flex;
  align-items: center;
  gap: 40px;
}

/* Logo wrapper */
.nav__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  text-decoration: none;
}

/* Logo images — only one shown at a time */
.nav__logo img {
  height: 36px;
  width: auto;
  display: block;
}

.nav__logo-light { display: none; }

/* Logo text label */
.nav__logo-text {
  font-family: var(--font-display);
  font-size: var(--font-size-nav-logo);
  font-weight: 700;
  color: var(--color-white);
  white-space: nowrap;
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: 32px;
  margin-left: auto;
}

.nav__list { display: flex; gap: 28px; }

.nav__link {
  font-size: var(--font-size-nav-link);
  font-weight: 400;
  color: var(--color-text-muted);
  transition: color var(--transition);
  white-space: nowrap;
}
.nav__link:hover { color: var(--color-primary); }

.nav__burger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  margin-left: auto;
}
.nav__burger img { width: 28px; height: 28px; filter: invert(1); }
.nav__burger .icon-close { display: none; }

/* ════════════════════════════════════════════
   HERO
════════════════════════════════════════════ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background-image: url(/images/main.png);
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
}

/* Animated particles via pseudo-element */
.hero__bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(1px 1px at 20% 30%, rgba(0,212,255,0.5) 0%, transparent 100%),
    radial-gradient(1px 1px at 40% 70%, rgba(0,212,255,0.3) 0%, transparent 100%),
    radial-gradient(1px 1px at 60% 20%, rgba(255,255,255,0.3) 0%, transparent 100%),
    radial-gradient(1px 1px at 80% 50%, rgba(0,212,255,0.4) 0%, transparent 100%),
    radial-gradient(1px 1px at 10% 80%, rgba(255,255,255,0.2) 0%, transparent 100%),
    radial-gradient(1px 1px at 90% 90%, rgba(0,212,255,0.3) 0%, transparent 100%);
  background-size: 400px 400px;
}

.hero__content {
  position: relative;
  z-index: 1;
  padding-top: 100px;
  padding-bottom: 80px;
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 7vw, 5.5rem);
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: -0.04em;
  line-height: 1.05;
  margin-bottom: 24px;
}

.hero__title::after {
  content: '';
  display: block;
  width: 80px;
  height: 4px;
  background: var(--color-primary);
  margin-top: 20px;
  border-radius: 2px;
}

.hero__subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--color-text-muted);
  max-width: 560px;
  margin-bottom: 40px;
}

/* ════════════════════════════════════════════
   FEATURES  — light section
════════════════════════════════════════════ */
.features {
  background: var(--color-light-bg);
}

.features .section__title {
  color: var(--color-light-text);
}

.features .section__intro {
  color: var(--color-light-muted);
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--color-light-surface);
  border: 1px solid var(--color-light-border);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  display: flex;
  gap: 20px;
  align-items: flex-start;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.feature-card:hover {
  border-color: var(--color-primary-2);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0, 82, 204, 0.12);
}

.feature-card__icon {
  flex-shrink: 0;
  width: 72px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-card__icon img {
  width: 72px;
  height: 72px;
  object-fit: contain;
  /* Recolor icons to primary blue on light bg */
  filter: brightness(0) saturate(100%) invert(35%) sepia(80%) saturate(600%) hue-rotate(175deg);
}

.feature-card__text {
  font-size: var(--font-size-card-text);
  color: var(--color-light-text);
  line-height: 1.6;
}

/* ════════════════════════════════════════════
   ARCHITECTURE
════════════════════════════════════════════ */
.architecture {
  background: var(--color-bg);
}

.arch-layer {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  margin-bottom: 80px;
  padding-bottom: 80px;
  border-bottom: 1px solid var(--color-border);
}

.arch-layer:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.arch-layer:nth-child(even) .arch-layer__visual { order: 2; }
.arch-layer:nth-child(even) .arch-layer__body   { order: 1; }

.arch-layer__visual img {
  border-radius: var(--radius-lg);
  box-shadow: 0 24px 64px rgba(0,0,0,0.5);
  width: 100%;
}

.arch-layer__title {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 20px;
  padding-left: 16px;
  border-left: 3px solid var(--color-primary);
}

.arch-layer__text {
  color: var(--color-text-muted);
  line-height: 1.8;
  font-size: 0.98rem;
}

.arch-layer__text a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.arch-layer__text strong {
  color: var(--color-white);
  font-weight: 600;
}

/* ════════════════════════════════════════════
   PRICING  — light section
════════════════════════════════════════════ */
.pricing {
  background: var(--color-light-bg);
}

.pricing .section__title {
  color: var(--color-light-text);
}

.pricing .section__intro {
  color: var(--color-light-muted);
}

.pricing__highlight {
  /* background: linear-gradient(135deg, rgba(0,148,179,0.1), rgba(0,82,204,0.1));
  border: 1px solid rgba(0, 148, 179, 0.35);
  border-radius: var(--radius-md);
  padding: 20px 24px; */
  color: var(--color-light-text);
  font-size: var(--font-size-base);
  margin-bottom: 16px;
  /* max-width: 680px; */
  font-weight: 700;
}

.pricing__slider {
  position: relative;
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 40px;
}

.pricing__track-wrapper {
  overflow: hidden;
  flex: 1;
}

.pricing__track {
  display: flex;
  gap: 24px;
  transition: transform 0.4s cubic-bezier(0.25, 1, 0.5, 1);
}

.pricing-card {
  flex-shrink: 0;
  width: 280px;
  background: var(--color-light-surface);
  border: 1px solid var(--color-light-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
  cursor: pointer;
}

.pricing-card:hover {
  border-color: var(--color-primary-2);
  box-shadow: 0 8px 32px rgba(0, 82, 204, 0.14);
}

.pricing-card--free {
  border-color: rgba(0, 148, 179, 0.5);
}

.pricing-card__image {
  background: linear-gradient(135deg, #dceeff, #c8e0ff);
  padding: 24px;
  display: flex;
  justify-content: center;
  min-height: 180px;
  align-items: center;
}

.pricing-card__image img {
  max-height: 130px;
  width: auto;
  margin: 0 auto;
  object-fit: contain;
}

.pricing-card__body {
  padding: 24px;
}

.pricing-card__name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-light-text);
  margin-bottom: 6px;
}

.pricing-card__tagline {
  font-size: var(--font-size-sm);
  color: var(--color-light-muted);
  margin-bottom: 20px;
  min-height: 40px;
}

.pricing-card__specs {
  margin-bottom: 20px;
}

.pricing-card__specs li {
  font-size: var(--font-size-sm);
  color: var(--color-light-text);
  padding: 6px 0;
  border-bottom: 1px solid var(--color-light-border);
}

.pricing-card__specs li:last-child { border-bottom: none; }

.spec-label {
  color: var(--color-light-muted);
  margin-right: 6px;
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.pricing-card__price {
  margin-bottom: 20px;
}

.pricing-card__price--free {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  color: var(--color-accent);
  font-weight: 700;
}

.price-monthly {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.6rem;
  color: var(--color-light-text);
  font-weight: 700;
}

.price-monthly small {
  font-size: 0.85rem;
  color: var(--color-light-muted);
}

.price-yearly {
  display: block;
  font-size: var(--font-size-xs);
  color: var(--color-light-muted);
  margin-top: 4px;
}

/* ════════════════════════════════════════════
   SLIDER ARROWS
════════════════════════════════════════════ */
.slider__arrow {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  z-index: 2;
}

.slider__arrow:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* Light-section slider arrows (pricing) */
.pricing .slider__arrow {
  border-color: var(--color-light-border);
  background: var(--color-light-surface);
  color: var(--color-light-text);
}
.pricing .slider__arrow:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.slider__arrow--dark {
  border-color: rgba(0,0,0,0.2);
  background: rgba(255,255,255,0.08);
  color: #333;
}
.slider__arrow--dark:hover {
  border-color: #333;
  color: #000;
}

/* ════════════════════════════════════════════
   HOW TO USE
════════════════════════════════════════════ */
.howto {
  background: var(--color-bg);
}

.howto__steps {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-bottom: 64px;
  max-width: 760px;
  position: relative;
  padding-left: 32px;
}

.howto__steps::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 28px;
  bottom: 28px;
  width: 2px;
  background: linear-gradient(180deg, var(--color-primary), transparent);
}

.howto__step {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  padding: 20px 0;
  position: relative;
}

.step-number {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-bg);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 1;
  margin-left: -52px;
}

.step-content { padding-top: 8px; }
.step-content p { font-size: var(--font-size-base); color: var(--color-text); }
.step-content a { color: var(--color-primary); text-decoration: underline; text-underline-offset: 3px; }

.step-note {
  margin-top: 8px !important;
  font-size: var(--font-size-sm) !important;
  color: var(--color-text-muted) !important;
  background: var(--color-surface);
  border-left: 3px solid var(--color-border);
  padding: 12px 16px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* Screenshots Slider */
.screenshots {
  display: flex;
  align-items: center;
  gap: 16px;
}

.screenshots__track-wrapper {
  overflow: hidden;
  flex: 1;
  border-radius: var(--radius-md);
}

.screenshots__track {
  display: flex;
  gap: 24px;
  transition: transform 0.4s cubic-bezier(0.25, 1, 0.5, 1);
}

.screenshot {
  flex-shrink: 0;
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
}

.screenshot img {
  width: 100%;
  border-radius: var(--radius-md);
  box-shadow: 0 16px 48px rgba(0,0,0,0.6);
  border: 1px solid var(--color-border);
}

/* ════════════════════════════════════════════
   FEEDBACK
════════════════════════════════════════════ */
.feedback {
  background: var(--color-light-bg);
  border-top: 1px solid var(--color-light-border);
}

.feedback__inner {
  text-align: center;
}

.feedback__inner .section__title {
  color: var(--color-light-text);
  margin-bottom: 12px;
}

.feedback__inner .section__intro {
  color: var(--color-light-muted);
  margin: 0 auto 40px;
}

.feedback__links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: center;
}

.feedback__link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  border: 1px solid var(--color-light-border);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-card-text);
  font-weight: 600;
  transition: var(--transition);
  color: var(--color-light-text);
  background: var(--color-light-surface);
}

.feedback__link:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-2px);
}

.feedback__link img {
  width: 20px;
  height: 20px;
  filter: invert(0) brightness(0.4);
  transition: filter var(--transition);
}

.feedback__link:hover img { filter: invert(20%) sepia(80%) saturate(600%) hue-rotate(200deg); }

/* ════════════════════════════════════════════
   FOOTER
════════════════════════════════════════════ */
.footer {
  background: var(--color-bg);
  padding: 32px 0;
  border-top: 1px solid var(--color-border);
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.footer__copy {
  font-size: var(--font-size-footer);
  color: var(--color-text-muted);
}

.footer__links {
  display: flex;
  gap: 24px;
}

.footer__links a {
  font-size: var(--font-size-footer);
  color: var(--color-text-muted);
  transition: color var(--transition);
}
.footer__links a:hover { color: var(--color-primary); }

/* ════════════════════════════════════════════
   RESPONSIVE
════════════════════════════════════════════ */
@media (max-width: 900px) {
  .arch-layer {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .arch-layer:nth-child(even) .arch-layer__visual,
  .arch-layer:nth-child(even) .arch-layer__body {
    order: unset;
  }
}

@media (max-width: 768px) {
  :root { --section-py: 72px; }

  .nav__burger { display: flex; }

  .nav__menu {
    position: fixed;
    inset: 0;
    background: rgba(11, 17, 32, 0.97);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 40px;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    backdrop-filter: blur(12px);
  }

  .nav__menu.open {
    transform: translateX(0);
  }

  .nav__list {
    flex-direction: column;
    align-items: center;
    gap: 28px;
  }

  .nav__link { font-size: 1.2rem; }

  .nav__burger.open .icon-menu  { display: none; }
  .nav__burger.open .icon-close { display: block; z-index: 1000;}

  .features__grid {
    grid-template-columns: 1fr;
  }

  .pricing-card { width: 260px; }

  .screenshot { max-width: 100%; }
}

@media (max-width: 480px) {
  .footer__inner { flex-direction: column; text-align: center; }
  .footer__links { flex-direction: column; align-items: center; gap: 12px; }
}