/* ═══════════════════════════════════════════════════
   SmartCandle — style.css
   Pre-launch validation landing page
   ═══════════════════════════════════════════════════ */

/* ─── TOKENS ─────────────────────────────────────── */
:root {
  --clr-bg:        #0d0b09;
  --clr-bg-alt:    #141210;
  --clr-surface:   #1c1814;
  --clr-surface2:  #231f1a;
  --clr-border:    rgba(255,255,255,0.08);
  --clr-flame:     #e8a045;
  --clr-flame-lt:  #f5c97a;
  --clr-flame-dk:  #b86e1a;
  --clr-text:      #f0ebe4;
  --clr-text-muted:#9e9188;
  --clr-white:     #ffffff;

  --ff-serif: 'Cormorant Garamond', Georgia, serif;
  --ff-sans:  'Inter', system-ui, sans-serif;

  --fs-xs:   0.75rem;
  --fs-sm:   0.875rem;
  --fs-base: 1rem;
  --fs-lg:   1.125rem;
  --fs-xl:   1.375rem;
  --fs-2xl:  1.75rem;
  --fs-3xl:  2.25rem;
  --fs-4xl:  3rem;
  --fs-5xl:  4rem;
  --fs-6xl:  5.5rem;

  --radius-sm: 4px;
  --radius:    8px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --shadow-sm: 0 2px 8px rgba(0,0,0,0.4);
  --shadow:    0 8px 32px rgba(0,0,0,0.5);
  --shadow-lg: 0 20px 60px rgba(0,0,0,0.6);

  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-w: 1160px;
}

/* ─── RESET ───────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  background: var(--clr-bg);
  color: var(--clr-text);
  font-family: var(--ff-sans);
  font-weight: 400;
  line-height: 1.7;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }
input, textarea, select {
  font: inherit;
  color: inherit;
  background: transparent;
  border: none;
  outline: none;
}
.hidden { display: none !important; }

/* ─── ACCESSIBILITY ──────────────────────────────── */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 999;
  padding: 0.6rem 1.25rem;
  background: var(--clr-flame);
  color: var(--clr-bg);
  border-radius: var(--radius);
  font-size: var(--fs-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: top 0.2s;
}
.skip-link:focus { top: 1rem; outline: 2px solid var(--clr-bg); outline-offset: 2px; }
:focus-visible {
  outline: 2px solid var(--clr-flame);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ─── TYPOGRAPHY ─────────────────────────────────── */
h1, h2, h3, h4 {
  font-family: var(--ff-serif);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.01em;
}
h1 { font-size: clamp(var(--fs-4xl), 8vw, var(--fs-6xl)); }
h2 { font-size: clamp(var(--fs-3xl), 5vw, var(--fs-4xl)); }
h3 { font-size: var(--fs-xl); }
h4 { font-size: var(--fs-lg); }
em { font-style: italic; color: var(--clr-flame-lt); text-shadow: 0 0 28px rgba(245,201,122,0.3); }
strong { font-weight: 600; color: var(--clr-white); }

/* ─── UTILITIES ──────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 5vw, 3rem);
}
.section { padding-block: clamp(4rem, 10vw, 8rem); }
.section--dark { background: var(--clr-bg-alt); }

.label {
  display: inline-block;
  font-family: var(--ff-sans);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--clr-flame);
  margin-bottom: 0.75rem;
}
.label--light { color: var(--clr-flame-lt); }

.section-header {
  text-align: center;
  max-width: 680px;
  margin-inline: auto;
  margin-bottom: clamp(2.5rem, 6vw, 5rem);
}
.section-header h2 { margin-bottom: 1rem; }
.section-header__sub {
  color: var(--clr-text-muted);
  font-size: var(--fs-lg);
}

/* ─── BUTTONS ─────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.75rem;
  border-radius: var(--radius);
  font-family: var(--ff-sans);
  font-size: var(--fs-sm);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  transition: all var(--transition);
  white-space: nowrap;
}
.btn--primary {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--clr-flame), var(--clr-flame-dk));
  color: var(--clr-bg);
  box-shadow: 0 4px 20px rgba(232,160,69,0.35);
}
.btn--primary::before {
  content: '';
  position: absolute;
  top: -50%; left: -75%;
  width: 50%; height: 200%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.18), transparent);
  transform: skewX(-20deg);
  transition: left 0.55s ease;
  pointer-events: none;
}
.btn--primary:hover::before { left: 160%; }
.btn--primary:hover {
  background: linear-gradient(135deg, var(--clr-flame-lt), var(--clr-flame));
  box-shadow: 0 6px 28px rgba(232,160,69,0.55);
  transform: translateY(-1px);
}
.btn--ghost {
  background: rgba(255,255,255,0.06);
  color: var(--clr-text);
  border: 1px solid var(--clr-border);
  backdrop-filter: blur(8px);
}
.btn--ghost:hover {
  background: rgba(255,255,255,0.12);
  border-color: rgba(255,255,255,0.2);
}
.btn--outline {
  background: transparent;
  color: var(--clr-flame);
  border: 1.5px solid var(--clr-flame);
}
.btn--outline:hover {
  background: rgba(232,160,69,0.1);
  border-color: var(--clr-flame-lt);
  color: var(--clr-flame-lt);
}
.btn--large { padding: 1rem 2.25rem; font-size: var(--fs-base); }
.btn--full { width: 100%; justify-content: center; }
.btn__arrow { width: 1em; height: 1em; transition: transform 0.2s ease; flex-shrink: 0; }
.btn:hover .btn__arrow { transform: translateX(4px); }

/* ─── REVEAL ANIMATION ───────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ─── NAV ─────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 1.25rem 0;
  transition: background var(--transition), padding var(--transition), box-shadow var(--transition);
}
.nav.scrolled {
  background: rgba(13,11,9,0.92);
  backdrop-filter: blur(16px);
  padding: 0.75rem 0;
  box-shadow: 0 2px 20px rgba(0,0,0,0.5);
}
.nav__inner {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 5vw, 3rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}
.nav__logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--ff-serif);
  font-size: var(--fs-xl);
  letter-spacing: 0.06em;
  color: var(--clr-white);
}
.nav__logo-flame { color: var(--clr-flame); font-size: 0.9em; }
.nav__links {
  display: flex;
  align-items: center;
  gap: 2rem;
}
.nav__links a {
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--clr-text-muted);
  transition: color var(--transition);
}
.nav__links a:hover { color: var(--clr-text); }
.nav__cta {
  padding: 0.55rem 1.25rem;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--clr-flame), var(--clr-flame-dk));
  color: var(--clr-bg) !important;
  font-weight: 600 !important;
  transition: opacity var(--transition), transform var(--transition) !important;
}
.nav__cta:hover { opacity: 0.9; transform: translateY(-1px); }
.nav__burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}
.nav__burger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--clr-text);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ─── HERO ─────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero__bg img {
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: center;
}
.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(13,11,9,0.55) 0%,
    rgba(13,11,9,0.35) 40%,
    rgba(13,11,9,0.75) 80%,
    rgba(13,11,9,1)    100%
  );
}
.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding-inline: clamp(1.25rem, 5vw, 3rem);
  max-width: 820px;
  animation: heroFadeUp 1.2s ease both;
}
@keyframes heroFadeUp {
  from { opacity: 0; transform: translateY(40px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes badgePulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(232,160,69,0); }
  50%       { box-shadow: 0 0 16px 3px rgba(232,160,69,0.18); }
}
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 1.1rem;
  border-radius: 100px;
  background: rgba(232,160,69,0.15);
  border: 1px solid rgba(232,160,69,0.4);
  color: var(--clr-flame-lt);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 1.75rem;
  animation: badgePulse 4s ease-in-out infinite;
}
.hero__badge-icon { width: 0.8rem; height: 0.8rem; flex-shrink: 0; }
.hero__title {
  color: var(--clr-white);
  margin-bottom: 1.25rem;
  text-shadow: 0 2px 20px rgba(0,0,0,0.5);
}
.hero__subtitle {
  font-size: clamp(var(--fs-lg), 2.5vw, var(--fs-xl));
  color: rgba(240,235,228,0.85);
  max-width: 600px;
  margin-inline: auto;
  margin-bottom: 2.5rem;
  line-height: 1.6;
}
.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}
.hero__scroll {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  opacity: 0.5;
  transition: opacity var(--transition);
  animation: scrollBounce 2s ease-in-out infinite;
}
.hero__scroll:hover { opacity: 1; }
.hero__scroll-line {
  display: block;
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, transparent, var(--clr-text));
}
@keyframes scrollBounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(8px); }
}

/* ─── CONCEPT ─────────────────────────────────────── */
.concept__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 6vw, 5rem);
  align-items: center;
}
.concept__image {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.concept__image img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  transition: transform 0.6s ease;
}
.concept__image:hover img { transform: scale(1.03); }
.concept__tag {
  position: absolute;
  bottom: 1rem;
  left: 1rem;
  padding: 0.35rem 0.85rem;
  border-radius: 100px;
  background: rgba(13,11,9,0.75);
  border: 1px solid var(--clr-border);
  backdrop-filter: blur(8px);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--clr-flame-lt);
}
.concept__copy { display: flex; flex-direction: column; gap: 1rem; }
.concept__copy h2 { margin-bottom: 0.25rem; }
.concept__copy p { color: var(--clr-text-muted); line-height: 1.8; }
.concept__note {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  margin-top: 0.5rem;
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
  background: rgba(232,160,69,0.07);
  border: 1px solid rgba(232,160,69,0.2);
}
.concept__note-icon { width: 1.1rem; height: 1.1rem; flex-shrink: 0; margin-top: 0.15rem; color: var(--clr-flame); }
.concept__note p { color: var(--clr-text-muted); font-size: var(--fs-sm); margin: 0; }

/* ─── FEATURES ────────────────────────────────────── */
.features__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.feature-card {
  padding: 2rem 1.75rem;
  border-radius: var(--radius-lg);
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}
.feature-card:hover {
  border-color: rgba(232,160,69,0.35);
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(0,0,0,0.5), inset 0 1px 0 rgba(232,160,69,0.25);
}
.feature-card__icon {
  width: 2rem;
  height: 2rem;
  margin-bottom: 1rem;
  display: block;
  color: var(--clr-flame);
  transition: transform 0.25s ease, filter 0.25s ease;
}
.feature-card:hover .feature-card__icon {
  transform: scale(1.18) translateY(-2px);
  filter: drop-shadow(0 0 8px rgba(232,160,69,0.55));
}
.feature-card h3 {
  font-size: var(--fs-lg);
  margin-bottom: 0.6rem;
  color: var(--clr-white);
}
.feature-card p { color: var(--clr-text-muted); font-size: var(--fs-sm); line-height: 1.7; }

/* ─── LIFESTYLE ───────────────────────────────────── */
.lifestyle__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 6vw, 5rem);
  align-items: center;
}
.lifestyle__copy { display: flex; flex-direction: column; gap: 1rem; }
.lifestyle__copy h2 { margin-bottom: 0.25rem; }
.lifestyle__copy p { color: var(--clr-text-muted); line-height: 1.8; }
.lifestyle__image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.lifestyle__image img {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  transition: transform 0.6s ease;
}
.lifestyle__image:hover img { transform: scale(1.03); }

/* ─── USE CASES ───────────────────────────────────── */
.usecases__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.usecase-card {
  padding: 2rem 1.5rem;
  border-radius: var(--radius-lg);
  background: var(--clr-surface2);
  border: 1px solid var(--clr-border);
  text-align: center;
  transition: border-color var(--transition), transform var(--transition);
}
.usecase-card:hover {
  border-color: rgba(232,160,69,0.3);
  transform: translateY(-3px);
  box-shadow: 0 10px 36px rgba(0,0,0,0.4);
  background: var(--clr-surface);
}
.usecase-card__icon { width: 2.25rem; height: 2.25rem; margin-bottom: 0.75rem; display: block; margin-inline: auto; color: var(--clr-flame); transition: transform 0.25s ease, filter 0.25s ease; }
.usecase-card:hover .usecase-card__icon {
  transform: scale(1.12);
  filter: drop-shadow(0 0 7px rgba(232,160,69,0.5));
}
.usecase-card h3 { font-size: var(--fs-base); font-weight: 600; margin-bottom: 0.5rem; color: var(--clr-white); }
.usecase-card p { color: var(--clr-text-muted); font-size: var(--fs-sm); line-height: 1.6; }

/* ─── PARTICIPATE ─────────────────────────────────── */
.participate { background: var(--clr-bg); }
.participate__layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-top: 1rem;
}
.participate__card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-xl);
  padding: clamp(1.75rem, 4vw, 2.75rem);
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}
.participate__card--alt {
  background: var(--clr-surface2);
  border-color: rgba(232,160,69,0.15);
}
.participate__card-header { text-align: center; }
.participate__card-icon { width: 2.5rem; height: 2.5rem; display: block; margin-bottom: 0.75rem; margin-inline: auto; color: var(--clr-flame); }
.participate__card-header h3 {
  font-size: var(--fs-2xl);
  margin-bottom: 0.5rem;
  color: var(--clr-white);
}
.participate__card-header p { color: var(--clr-text-muted); font-size: var(--fs-sm); }

/* ─── FORMS ───────────────────────────────────────── */
.participate__form { display: flex; flex-direction: column; gap: 1.25rem; }
.form__group { display: flex; flex-direction: column; gap: 0.4rem; }
.form__group label {
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--clr-text-muted);
}
.form__optional { font-weight: 400; opacity: 0.6; }
.form__group input,
.form__group textarea,
.form__group select {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--clr-border);
  color: var(--clr-text);
  font-size: var(--fs-sm);
  transition: border-color var(--transition), background var(--transition);
  -webkit-appearance: none;
  appearance: none;
}
.form__group input:focus,
.form__group textarea:focus,
.form__group select:focus {
  border-color: rgba(232,160,69,0.6);
  background: rgba(255,255,255,0.07);
  outline: none;
  box-shadow: 0 0 0 3px rgba(232,160,69,0.15);
}
.form__group input::placeholder,
.form__group textarea::placeholder { color: rgba(158,145,136,0.5); }
.form__group select option { background: var(--clr-surface); color: var(--clr-text); }
.form__group textarea { resize: vertical; min-height: 120px; }
.form__group--check { flex-direction: row; align-items: flex-start; gap: 0; }
.form__checkbox {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  cursor: pointer;
  font-size: var(--fs-sm);
  color: var(--clr-text-muted);
}
.form__checkbox input[type="checkbox"] {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  margin-top: 2px;
  accent-color: var(--clr-flame);
  cursor: pointer;
  padding: 0;
  border: none;
  background: transparent;
}
.form__privacy {
  text-align: center;
  font-size: var(--fs-xs);
  color: var(--clr-text-muted);
  opacity: 0.6;
  margin-top: -0.5rem;
}
.form__privacy a { color: inherit; text-decoration: underline; text-underline-offset: 2px; }
.form__privacy a:hover { color: var(--clr-flame-lt); opacity: 1; }

/* ─── SUCCESS STATE ───────────────────────────────── */
.participate__success {
  text-align: center;
  padding: 2rem 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  animation: fadeIn 0.5s ease;
}
@keyframes fadeIn { from { opacity: 0; transform: scale(0.95); } to { opacity: 1; transform: scale(1); } }
.participate__success-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(232,160,69,0.15);
  border: 2px solid var(--clr-flame);
  color: var(--clr-flame);
  font-size: 1.5rem;
  font-weight: 700;
}
.participate__success h4 { font-size: var(--fs-xl); color: var(--clr-white); }
.participate__success p { color: var(--clr-text-muted); font-size: var(--fs-sm); max-width: 280px; }

/* ─── FOOTER ──────────────────────────────────────── */
.footer {
  background: var(--clr-bg-alt);
  border-top: 1px solid var(--clr-border);
  padding-block: 3rem;
}
.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  text-align: center;
}
.footer__brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
}
.footer__brand-name {
  font-family: var(--ff-serif);
  font-size: var(--fs-xl);
  letter-spacing: 0.06em;
  color: var(--clr-white);
}
.footer__tagline { font-size: var(--fs-sm); color: var(--clr-text-muted); }
.footer__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: center;
}
.footer__nav a {
  font-size: var(--fs-sm);
  color: var(--clr-text-muted);
  transition: color var(--transition);
}
.footer__nav a:hover { color: var(--clr-flame); }
.footer__copy { font-size: var(--fs-xs); color: var(--clr-text-muted); opacity: 0.5; }

/* ─── LANGUAGE SWITCHER ──────────────────────────── */
.nav__lang {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: 0.5rem;
  padding-left: 1rem;
  border-left: 1px solid var(--clr-border);
}
.lang-btn {
  padding: 0.3rem 0.55rem;
  border-radius: var(--radius-sm);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--clr-text-muted);
  background: transparent;
  border: 1px solid transparent;
  transition: all var(--transition);
  cursor: pointer;
  line-height: 1;
}
.lang-btn:hover {
  color: var(--clr-text);
  border-color: var(--clr-border);
}
.lang-btn.active {
  color: var(--clr-flame);
  border-color: rgba(232,160,69,0.4);
  background: rgba(232,160,69,0.08);
}

/* ─── RESPONSIVE ──────────────────────────────────── */
@media (max-width: 900px) {
  .features__grid,
  .usecases__grid { grid-template-columns: repeat(2, 1fr); }
  .concept__grid,
  .lifestyle__grid { grid-template-columns: 1fr; }
  .lifestyle__copy { order: 2; }
  .lifestyle__image { order: 1; }
  .participate__layout { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .nav__links {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(13,11,9,0.97);
    backdrop-filter: blur(16px);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2.5rem;
    z-index: 99;
  }
  .nav__links.open { display: flex; }
  .nav__links a { font-size: var(--fs-xl); }
  .nav__burger { display: flex; z-index: 101; }
  .nav__lang {
    border-left: none;
    padding-left: 0;
    margin-left: 0;
    gap: 6px;
  }
  .lang-btn { font-size: var(--fs-sm); padding: 0.45rem 0.8rem; }
  .nav__burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav__burger.open span:nth-child(2) { opacity: 0; }
  .nav__burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  .features__grid,
  .usecases__grid { grid-template-columns: 1fr; }
  .hero__actions { flex-direction: column; align-items: center; }
  .hero__actions .btn { width: 100%; max-width: 320px; justify-content: center; }
}

/* ─── DESKTOP CAROUSEL ───────────────────────────── */
@media (min-width: 641px) {
  /* Lock body scroll — the carousel handles all scrolling */
  html, body { overflow: hidden; height: 100%; }

  .carousel {
    width: 100vw;
    height: 100svh;
    height: 100vh; /* fallback */
    overflow: hidden;
  }

  .carousel__track {
    display: flex;
    height: 100%;
    /* Transition is controlled via JS — set here as default */
    transition: transform 0.75s cubic-bezier(0.77, 0, 0.175, 1);
    will-change: transform;
  }

  /* Each section becomes a full-viewport slide */
  .carousel__slide {
    flex: 0 0 100vw;
    width: 100vw;
    height: 100svh;
    height: 100vh; /* fallback */
    overflow-y: auto;
    overflow-x: hidden;
    /* Thin scrollbar for slides that overflow vertically */
    scrollbar-width: thin;
    scrollbar-color: rgba(232,160,69,0.3) transparent;
  }
  .carousel__slide::-webkit-scrollbar { width: 4px; }
  .carousel__slide::-webkit-scrollbar-thumb { background: rgba(232,160,69,0.3); border-radius: 2px; }
  .carousel__slide::-webkit-scrollbar-track { background: transparent; }

  /* Hero: override min-height so it's exactly one viewport */
  .carousel__slide.hero { min-height: unset; }

  /* Hide the hero's vertical scroll hint on desktop */
  .hero__scroll { display: none; }

  /* ── Dot navigation (right side, vertical) ─────── */
  .carousel__dots {
    position: fixed;
    right: 1.5rem;
    top: 50%;
    transform: translateY(-50%);
    z-index: 150;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    align-items: center;
  }

  .carousel__dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: rgba(240,235,228,0.22);
    border: 1px solid rgba(240,235,228,0.18);
    cursor: pointer;
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    padding: 0;
  }

  .carousel__dot:hover:not(.active) {
    background: rgba(240,235,228,0.45);
    border-color: rgba(240,235,228,0.4);
  }

  .carousel__dot.active {
    background: var(--clr-flame);
    border-color: var(--clr-flame);
    height: 26px;
    border-radius: 4px;
  }

  /* Tooltip label on hover */
  .carousel__dot[data-label]::before {
    content: attr(data-label);
    position: absolute;
    right: calc(100% + 0.75rem);
    top: 50%;
    transform: translateY(-50%);
    background: rgba(13,11,9,0.88);
    border: 1px solid var(--clr-border);
    color: var(--clr-text-muted);
    font-family: var(--ff-sans);
    font-size: var(--fs-xs);
    font-weight: 500;
    letter-spacing: 0.06em;
    white-space: nowrap;
    padding: 0.3rem 0.65rem;
    border-radius: var(--radius-sm);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
    backdrop-filter: blur(8px);
  }

  .carousel__dot[data-label]:hover::before { opacity: 1; }

  /* Slide counter badge (bottom-left) */
  .carousel__counter {
    position: fixed;
    bottom: 1.75rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 150;
    font-family: var(--ff-sans);
    font-size: var(--fs-xs);
    font-weight: 500;
    letter-spacing: 0.12em;
    color: var(--clr-text-muted);
    opacity: 0.55;
    user-select: none;
    pointer-events: none;
  }
}

/* ─── REDUCED MOTION ─────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1 !important; transform: none !important; }
  .hero__content { animation: none; }
  .hero__scroll { animation: none; }
}