/* ============================================
   Soulmark Homepage — Premium Minimal Design
   Palette: warm ivory + deep brown, low saturation
   ============================================ */

:root {
  --color-white:     #FFFFFF;

  --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', Arial, sans-serif;
  --font-display: var(--font-body);
  --content-max: 1400px;
  --page-gutter: clamp(24px, 5vw, 96px);

  --nav-height: 72px;
  --radius-sm:  8px;
  --radius-md:  16px;
  --radius-lg:  24px;
  --transition:  cubic-bezier(0.22, 1, 0.36, 1);
  --transition-fast: cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  overflow-x: hidden;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: none; background: none; }

.container {
  width: min(var(--content-max), calc(100% - var(--page-gutter) - var(--page-gutter)));
  margin-inline: auto;
}

/* ── Navigation ── */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-height);
  transition: background 0.5s var(--transition),
              box-shadow 0.5s var(--transition),
              backdrop-filter 0.5s var(--transition);
}

.nav--scrolled {
  background: rgba(var(--rgb-nav), 0.82);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  box-shadow: 0 1px 0 rgba(var(--rgb-text), 0.06);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  width: min(var(--content-max), calc(100% - var(--page-gutter) - var(--page-gutter)));
  margin-inline: auto;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--color-brown-800);
  transition: opacity 0.3s;
}
.nav__logo:hover { opacity: 0.7; }

.nav__logo-mark {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav__link {
  position: relative;
  font-size: 0.875rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  transition: color 0.3s var(--transition-fast);
  padding: 4px 0;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  width: 0;
  height: 1px;
  background: var(--color-brown-700);
  transition: width 0.4s var(--transition), left 0.4s var(--transition);
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-brown-800);
}

.nav__link:hover::after,
.nav__link--active::after {
  width: 100%;
  left: 0;
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav__lang {
  padding: 8px 14px;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--color-brown-700);
  border: 1px solid rgba(var(--rgb-accent), 0.35);
  border-radius: 100px;
  background: rgba(var(--rgb-surface), 0.6);
  transition: background 0.3s var(--transition-fast),
              border-color 0.3s,
              color 0.3s,
              transform 0.3s var(--transition);
}

.nav__lang:hover {
  background: var(--color-surface);
  border-color: var(--color-brown-500);
  color: var(--color-brown-900);
  transform: translateY(-1px);
}

.nav__cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--color-bg-warm);
  background: var(--accent-bg);
  border-radius: 100px;
  transition: transform 0.35s var(--transition),
              box-shadow 0.35s var(--transition),
              background 0.35s;
}

.nav__cta svg {
  width: 14px;
  height: 14px;
  transition: transform 0.35s var(--transition);
}

.nav__cta:hover {
  background: var(--accent-bg-hover);
  box-shadow: 0 6px 24px rgba(var(--rgb-theme), 0.22);
  transform: translateY(-1px);
}

.nav__cta:hover svg {
  transform: translateY(2px);
}

.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 36px;
  height: 36px;
  padding: 6px;
}

.nav__toggle span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--color-brown-800);
  transition: transform 0.4s var(--transition), opacity 0.3s;
  transform-origin: center;
}

.nav__toggle.is-open span:first-child {
  transform: translateY(3.75px) rotate(45deg);
}
.nav__toggle.is-open span:last-child {
  transform: translateY(-3.75px) rotate(-45deg);
}

.nav__mobile {
  position: fixed;
  inset: 0;
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 28px;
  background: rgba(var(--rgb-bg), 0.97);
  backdrop-filter: blur(24px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.5s var(--transition), visibility 0.5s;
}

.nav__mobile.is-open {
  opacity: 1;
  visibility: visible;
}

.nav__mobile a {
  font-family: var(--font-display);
  font-size: 1.75rem;
  color: var(--color-brown-800);
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.4s var(--transition), transform 0.4s var(--transition), color 0.3s;
}

.nav__mobile.is-open a {
  opacity: 1;
  transform: translateY(0);
}

.nav__mobile.is-open a:nth-child(1) { transition-delay: 0.05s; }
.nav__mobile.is-open a:nth-child(2) { transition-delay: 0.10s; }
.nav__mobile.is-open a:nth-child(3) { transition-delay: 0.15s; }
.nav__mobile.is-open a:nth-child(4) { transition-delay: 0.20s; }
.nav__mobile.is-open a:nth-child(5) { transition-delay: 0.25s; }
.nav__mobile.is-open a:nth-child(6) { transition-delay: 0.30s; }
.nav__mobile.is-open a:nth-child(7) { transition-delay: 0.35s; }

.nav__mobile a:hover { color: var(--color-brown-500); }

.nav__mobile-lang {
  margin-top: 8px;
  padding: 10px 28px;
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--color-brown-700);
  border: 1px solid rgba(var(--rgb-accent), 0.35);
  border-radius: 100px;
  background: rgba(var(--rgb-surface), 0.8);
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.4s var(--transition), transform 0.4s var(--transition);
}

.nav__mobile.is-open .nav__mobile-lang {
  opacity: 1;
  transform: translateY(0);
  transition-delay: 0.32s;
}

.nav__mobile-cta {
  margin-top: 12px;
  padding: 14px 36px !important;
  font-family: var(--font-body) !important;
  font-size: 0.9375rem !important;
  background: var(--accent-bg);
  color: var(--color-bg-warm) !important;
  border-radius: 100px;
}

/* ── Hero ── */

.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero__bg-img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 72% center;
  transform: scale(1.06);
  transition: transform 0.1s linear;
  will-change: transform;
}

.hero__bg-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(
      100deg,
      rgba(var(--rgb-bg), 0.94) 0%,
      rgba(var(--rgb-bg), 0.82) 38%,
      rgba(var(--rgb-bg-warm), 0.45) 62%,
      rgba(var(--rgb-bg-warm), 0.12) 100%
    );
}

.hero__grain {
  position: absolute;
  inset: 0;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 180px;
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 1;
  width: min(var(--content-max), calc(100% - var(--page-gutter) - var(--page-gutter)));
  margin-inline: auto;
  padding: calc(var(--nav-height) + 60px) 0 120px;
}

.hero__copy {
  max-width: 780px;
}

.hero__eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-brown-500);
  margin-bottom: 28px;
  padding: 6px 16px;
  border: 1px solid rgba(var(--rgb-accent), 0.25);
  border-radius: 100px;
  background: rgba(var(--rgb-surface), 0.5);
  backdrop-filter: blur(8px);
}

.hero__title {
  font-family: var(--font-display);
  font-size: 4.5rem;
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: 0;
  color: var(--color-brown-900);
  margin-bottom: 28px;
}

.hero__title em {
  font-style: normal;
  color: var(--color-brown-700);
}

.hero__title,
.hero__subtitle,
.cta-section__title {
  max-width: 760px;
}

.hero__subtitle {
  font-size: 1.2rem;
  font-weight: 300;
  color: var(--color-text-muted);
  margin: 0 0 44px;
  letter-spacing: 0.02em;
  line-height: 1.85;
}

.hero__actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-start;
  gap: 18px 24px;
}

/* ── Buttons ── */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 32px;
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  border-radius: 100px;
  transition: transform 0.4s var(--transition),
              box-shadow 0.4s var(--transition),
              background 0.4s;
  position: relative;
  overflow: hidden;
}

.btn svg {
  width: 18px;
  height: 18px;
  transition: transform 0.4s var(--transition);
}

.btn--primary {
  color: var(--color-bg-warm);
  background: var(--accent-bg);
  box-shadow: 0 4px 20px rgba(var(--rgb-theme), 0.18);
}

.btn--primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 30%, rgba(255,255,255,0.08) 50%, transparent 70%);
  transform: translateX(-100%);
  transition: transform 0.6s;
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 36px rgba(var(--rgb-theme), 0.26);
  background: var(--accent-bg-hover);
}

.btn--primary:hover::before {
  transform: translateX(100%);
}

.btn--primary:hover svg {
  transform: translateX(4px);
}

.btn--secondary {
  color: var(--color-brown-800);
  border: 1px solid var(--border-medium);
  background: rgba(var(--rgb-surface), 0.72);
  box-shadow: none;
}

.btn--secondary:hover {
  color: var(--color-brown-900);
  border-color: var(--color-brown-500);
  background: var(--color-surface);
  transform: translateY(-2px);
}

.hero__actions .btn {
  min-height: 56px;
  justify-content: center;
}

.btn--large {
  padding: 18px 40px;
  font-size: 1rem;
}

/* ── Scroll hint ── */

.hero__scroll-hint {
  position: absolute;
  bottom: 40px;
  left: max(24px, calc((100% - 1120px) / 2 + 24px));
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
  opacity: 0;
  animation: fade-in 1s var(--transition) 2s forwards;
}

.hero__scroll-hint span {
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-text-light);
}

.hero__scroll-line {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, var(--color-brown-300), transparent);
  animation: scroll-pulse 2.4s ease-in-out infinite;
}

@keyframes scroll-pulse {
  0%, 100% { transform: scaleY(1); opacity: 0.6; }
  50% { transform: scaleY(0.5); opacity: 1; }
}

@keyframes fade-in {
  to { opacity: 1; }
}

/* ── Features ── */

.features {
  padding: 120px 0 100px;
  background: var(--color-bg-warm);
  position: relative;
}

.features__intro {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.65fr);
  align-items: end;
  gap: 72px;
  margin-bottom: 56px;
}

.section-label {
  margin-bottom: 14px;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-brown-500);
}

.features__intro h2,
.intelligence__intro h2 {
  max-width: 680px;
  font-family: var(--font-display);
  font-size: 3.15rem;
  font-weight: 500;
  line-height: 1.15;
  letter-spacing: 0;
  color: var(--color-brown-900);
}

.features__intro > p,
.intelligence__intro > p:last-child {
  max-width: 460px;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--color-text-muted);
}

.features::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-brown-100), transparent);
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-card {
  position: relative;
  padding: 44px 36px 40px;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-soft);
  transition: transform 0.5s var(--transition),
              box-shadow 0.5s var(--transition),
              border-color 0.5s;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-brown-300), var(--color-brown-500));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.6s var(--transition);
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-medium);
}

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-card__icon {
  width: 52px;
  height: 52px;
  margin-bottom: 28px;
  color: var(--color-brown-800);
  transition: transform 0.5s var(--transition);
}

.feature-card__number {
  position: absolute;
  top: 28px;
  right: 30px;
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--color-text-light);
}

.feature-card:hover .feature-card__icon {
  transform: scale(1.08) rotate(-3deg);
}

.feature-card__title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 500;
  color: var(--color-brown-900);
  margin-bottom: 12px;
  line-height: 1.35;
}

.feature-card__text {
  font-size: 0.9375rem;
  font-weight: 300;
  color: var(--color-text-muted);
  line-height: 1.8;
}

.feature-card__line {
  position: absolute;
  bottom: 0;
  left: 36px;
  right: 36px;
  height: 1px;
  background: linear-gradient(90deg, var(--color-brown-100), transparent);
  opacity: 0;
  transition: opacity 0.5s;
}

.feature-card:hover .feature-card__line {
  opacity: 1;
}

/* ── Relationship intelligence loop ── */

.intelligence {
  position: relative;
  overflow: hidden;
  padding: 128px 0;
  background: var(--color-bg);
}

.intelligence::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(var(--rgb-text), 0.035) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(var(--rgb-text), 0.035) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(to bottom, transparent, #000 18%, #000 82%, transparent);
  pointer-events: none;
}

.intelligence__intro {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.56fr);
  align-items: end;
  gap: 72px;
  margin-bottom: 64px;
}

.intelligence__intro .section-label,
.intelligence__intro h2 {
  grid-column: 1;
}

.intelligence__intro h2 {
  margin-top: -56px;
}

.intelligence__intro > p:last-child {
  grid-column: 2;
  grid-row: 1 / span 2;
}

.intelligence__visual {
  position: relative;
  display: grid;
  grid-template-columns: minmax(180px, 0.45fr) minmax(80px, 0.2fr) minmax(380px, 1fr);
  align-items: center;
  min-height: 320px;
  margin-bottom: 56px;
  padding: 48px;
  border-top: 1px solid var(--border-medium);
  border-bottom: 1px solid var(--border-medium);
}

.signal-card--message {
  position: relative;
  padding-left: 22px;
}

.signal-card--message::before {
  content: '';
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: var(--color-brown-500);
}

.signal-card span,
.signal-analysis__item span {
  display: block;
  margin-bottom: 8px;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-light);
}

.signal-card strong {
  font-family: var(--font-display);
  font-size: 4.2rem;
  font-weight: 500;
  color: var(--color-brown-900);
}

.signal-rail {
  position: relative;
  height: 1px;
  margin-inline: 28px;
  overflow: hidden;
  background: var(--border-medium);
}

.signal-rail span {
  position: absolute;
  inset: 0;
  background: var(--color-brown-500);
  transform: translateX(-100%);
}

.intelligence__visual.is-playing .signal-rail span {
  animation: signal-travel 2.8s var(--transition) infinite;
}

.signal-analysis {
  display: grid;
  gap: 10px;
}

.signal-analysis__item {
  position: relative;
  display: grid;
  grid-template-columns: 110px 1fr;
  align-items: center;
  gap: 20px;
  padding: 18px 22px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  background: rgba(var(--rgb-surface), 0.66);
  opacity: 0.5;
  transform: translateX(16px);
  transition: opacity 0.55s var(--transition), transform 0.55s var(--transition), border-color 0.55s;
}

.signal-analysis__item span {
  margin: 0;
}

.signal-analysis__item p {
  font-size: 0.875rem;
  line-height: 1.55;
  color: var(--color-text-muted);
}

.intelligence__visual.is-playing .signal-analysis__item {
  opacity: 1;
  transform: translateX(0);
}

.intelligence__visual.is-playing .signal-analysis__item--thought { transition-delay: 0.2s; }
.intelligence__visual.is-playing .signal-analysis__item--pattern {
  border-color: var(--border-medium);
  transition-delay: 0.4s;
}

.loop-steps {
  position: relative;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  list-style: none;
}

.loop-steps::before {
  content: '';
  position: absolute;
  top: 17px;
  left: 10%;
  right: 10%;
  height: 1px;
  background: var(--border-medium);
}

.loop-step {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.loop-step > span {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  margin-bottom: 16px;
  border: 1px solid var(--border-medium);
  border-radius: 50%;
  background: var(--color-bg);
  font-size: 0.6875rem;
  color: var(--color-text-light);
  transition: color 0.4s, background 0.4s, border-color 0.4s, transform 0.4s var(--transition);
}

.loop-step strong {
  margin-bottom: 3px;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color 0.4s;
}

.loop-step small {
  font-size: 0.75rem;
  color: var(--color-text-light);
}

.loop-step.is-active > span {
  color: var(--color-bg-warm);
  border-color: var(--color-brown-800);
  background: var(--accent-bg);
  transform: scale(1.08);
}

.loop-step.is-active strong {
  color: var(--color-brown-900);
}

@keyframes signal-travel {
  0% { transform: translateX(-100%); }
  45%, 100% { transform: translateX(100%); }
}

/* ── CTA Section ── */

.cta-section {
  padding: 120px 0 160px;
  background: var(--color-bg);
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 600px;
  height: 600px;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(var(--rgb-mid), 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.cta-section__inner {
  text-align: left;
  position: relative;
}

.cta-section__label {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-brown-500);
  margin-bottom: 20px;
}

.cta-section__title {
  font-family: var(--font-display);
  font-size: 2.8rem;
  font-weight: 500;
  color: var(--color-brown-900);
  line-height: 1.3;
  margin-bottom: 44px;
}

/* ── Mascot (火柴人) ── */

.mascot {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 900;
  cursor: pointer;
  transition: transform 0.5s var(--transition);
  outline: none;
}

.mascot:hover {
  transform: scale(1.05);
}

.mascot:focus-visible {
  outline: 2px solid var(--color-brown-500);
  outline-offset: 6px;
  border-radius: 8px;
}

.mascot__figure {
  width: 96px;
  height: 120px;
  position: relative;
  z-index: 1;
  animation: mascot-float 4s ease-in-out infinite;
}

.mascot.is-waving .mascot__figure {
  animation: mascot-wave 0.5s ease-in-out;
}

.mascot__shadow {
  width: 60px;
  height: 8px;
  background: rgba(var(--rgb-text), 0.08);
  border-radius: 50%;
  margin: -4px auto 0;
  animation: shadow-pulse 4s ease-in-out infinite;
}

@keyframes shadow-pulse {
  0%, 100% { transform: scaleX(1); opacity: 0.6; }
  50% { transform: scaleX(0.85); opacity: 0.4; }
}

.mascot__bubble {
  position: absolute;
  bottom: calc(100% + 12px);
  right: 0;
  padding: 12px 18px;
  background: var(--color-surface);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px) scale(0.92);
  transition: opacity 0.4s var(--transition),
              transform 0.4s var(--transition),
              visibility 0.4s;
}

.mascot__bubble span {
  font-family: var(--font-display);
  font-size: 1rem;
  font-style: normal;
  color: var(--color-brown-800);
  letter-spacing: 0.02em;
}

.mascot__bubble-tail {
  position: absolute;
  bottom: -7px;
  right: 24px;
  width: 14px;
  height: 14px;
  background: var(--color-surface);
  border-right: 1px solid var(--border-medium);
  border-bottom: 1px solid var(--border-medium);
  transform: rotate(45deg);
}

.mascot__bubble.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

@keyframes mascot-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

@keyframes mascot-wave {
  0%, 100% { transform: translateY(0) rotate(0); }
  25% { transform: translateY(-8px) rotate(-5deg); }
  75% { transform: translateY(-4px) rotate(3deg); }
}

/* ── Footer ── */

.footer {
  position: relative;
  overflow: hidden;
  color: var(--color-bg-warm);
  background: var(--color-brown-900);
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-brown-300), transparent);
  opacity: 0.65;
}

.footer__main {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(300px, 0.8fr);
  gap: 96px;
  padding-top: 72px;
  padding-bottom: 56px;
}

.footer__identity {
  max-width: 500px;
}

.footer__logo {
  display: flex;
  align-items: center;
  gap: 12px;
  width: fit-content;
  margin-bottom: 26px;
}

.footer__logo img {
  width: 44px;
  height: 44px;
  object-fit: contain;
  filter: brightness(1.5);
}

.footer__logo span {
  font-family: var(--font-display);
  font-size: 1.55rem;
  font-weight: 500;
  color: var(--color-bg-warm);
}

.footer__tagline {
  max-width: 460px;
  margin-bottom: 28px;
  font-family: var(--font-display);
  font-size: 2rem;
  line-height: 1.35;
  color: var(--color-bg-warm);
}

.footer__download {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding-bottom: 5px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.42);
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.82);
  transition: color 0.25s, gap 0.25s, border-color 0.25s;
}

.footer__download:hover {
  gap: 18px;
  color: #fff;
  border-color: #fff;
}

.footer__links {
  display: grid;
  grid-template-columns: repeat(2, minmax(120px, 1fr));
  gap: 48px;
}

.footer__group {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
}

.footer__group-title {
  margin-bottom: 5px;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.45);
}

.footer__group a {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.72);
  transition: color 0.25s, transform 0.25s;
}

.footer__group a:hover {
  color: #fff;
  transform: translateX(3px);
}

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding-top: 22px;
  padding-bottom: 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.footer__copy,
.footer__note {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.48);
}

/* ── Scroll Reveal ── */

.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.9s var(--transition),
              transform 0.9s var(--transition);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.12s; }
.reveal-delay-2 { transition-delay: 0.24s; }
.reveal-delay-3 { transition-delay: 0.36s; }

/* ── Responsive ── */

@media (max-width: 960px) {
  .nav__links,
  .nav__actions { display: none; }
  .nav__toggle { display: flex; }

  .hero__content {
    width: calc(100% - 48px);
    grid-template-columns: 1fr;
    gap: 44px;
    padding-left: 0;
    padding-right: 0;
  }

  .hero__title {
    font-size: 4.25rem;
  }

  .features__intro h2,
  .intelligence__intro h2 {
    font-size: 2.6rem;
  }

  .signal-card strong {
    font-size: 3.3rem;
  }

  .hero__scroll-hint {
    left: 24px;
  }

  .features__grid {
    grid-template-columns: 1fr;
    gap: 20px;
    max-width: 480px;
    margin-inline: auto;
  }

  .features__intro,
  .intelligence__intro {
    grid-template-columns: 1fr;
    gap: 22px;
  }

  .intelligence__intro .section-label,
  .intelligence__intro h2,
  .intelligence__intro > p:last-child {
    grid-column: 1;
    grid-row: auto;
  }

  .intelligence__intro h2 {
    margin-top: 0;
  }

  .intelligence__visual {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .signal-rail {
    width: 1px;
    height: 48px;
    margin: 0 0 0 20px;
  }

  .signal-rail span {
    transform: translateY(-100%);
  }

  .intelligence__visual.is-playing .signal-rail span {
    animation-name: signal-travel-vertical;
  }

  .feature-card {
    padding: 36px 28px 32px;
  }

  .mascot {
    bottom: 12px;
    right: 12px;
  }

  .mascot__figure {
    width: 80px;
    height: 100px;
  }

  .footer__main {
    grid-template-columns: 1fr;
    gap: 48px;
    padding-top: 56px;
  }

  .footer__links {
    max-width: 420px;
  }
}

@media (max-width: 480px) {
  .hero__content {
    gap: 34px;
    padding-bottom: 80px;
  }

  .hero__title {
    font-size: 2.65rem;
  }

  .hero__subtitle {
    font-size: 1rem;
  }

  .features__intro h2,
  .intelligence__intro h2 {
    font-size: 2.1rem;
  }

  .signal-card strong {
    font-size: 2.8rem;
  }

  .cta-section__title {
    font-size: 2.1rem;
  }

  .footer__tagline {
    font-size: 1.5rem;
  }

  .features,
  .intelligence {
    padding: 88px 0;
  }

  .features__intro {
    margin-bottom: 36px;
  }

  .intelligence__visual {
    min-height: 0;
    padding: 36px 0;
  }

  .signal-analysis__item {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .loop-steps {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .loop-steps::before {
    top: 16px;
    bottom: 16px;
    left: 16px;
    right: auto;
    width: 1px;
    height: auto;
  }

  .loop-step {
    display: grid;
    grid-template-columns: 34px 72px 1fr;
    align-items: center;
    gap: 14px;
    text-align: left;
  }

  .loop-step > span {
    margin-bottom: 0;
  }

  .loop-step strong {
    margin-bottom: 0;
  }

  .hero__scroll-hint {
    display: none;
  }

  .cta-section {
    padding: 80px 0 120px;
  }

  .footer__main {
    gap: 40px;
    padding-top: 48px;
    padding-bottom: 40px;
  }

  .footer__links {
    gap: 28px;
  }

  .footer__bottom {
    flex-direction: column;
    align-items: flex-start;
    padding-top: 20px;
    padding-bottom: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .hero__bg-img {
    transform: none !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }

  .intelligence__visual.is-playing .signal-rail span {
    animation: none;
  }
}

@keyframes signal-travel-vertical {
  0% { transform: translateY(-100%); }
  45%, 100% { transform: translateY(100%); }
}