/* ===== Design Tokens ===== */
:root {
  --color-bg: #f4f6f9;
  --color-surface: #ffffff;
  --color-dark: #080c14;
  --color-dark-2: #0f1520;
  --color-primary: #6b8cae;
  --color-primary-bright: #8eb4d4;
  --color-accent: #c4a574;
  --color-text: #0d1117;
  --color-text-muted: #5c6678;
  --color-text-on-dark: rgba(255, 255, 255, 0.92);
  --color-text-muted-on-dark: rgba(255, 255, 255, 0.55);
  --color-border: rgba(13, 17, 23, 0.08);
  --color-border-dark: rgba(255, 255, 255, 0.08);
  --font-sans: "Noto Sans SC", "PingFang SC", -apple-system, sans-serif;
  --radius: 12px;
  --radius-lg: 20px;
  --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: color var(--transition), opacity var(--transition); }
.container { width: min(1200px, 92vw); margin-inline: auto; }

/* ===== Header ===== */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  transition: background var(--transition), backdrop-filter var(--transition);
}

.site-header.scrolled {
  background: rgba(8, 12, 20, 0.92);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border-dark);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: #fff;
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.logo-img {
  width: 36px;
  height: 36px;
  object-fit: contain;
  filter: brightness(0) invert(1);
  opacity: 0.95;
}


.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}

.nav-links a {
  color: var(--color-text-muted-on-dark);
  font-size: 0.82rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.nav-links a:hover { color: #fff; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: #fff;
  transition: var(--transition);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.9rem 2rem;
  font-size: 0.88rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  border-radius: 2px;
  transition: all var(--transition);
}

.btn-primary {
  background: #fff;
  color: var(--color-dark);
  border: 1px solid #fff;
}

.btn-primary:hover {
  background: transparent;
  color: #fff;
}

.btn-ghost {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.35);
}

.btn-ghost:hover {
  border-color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

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

.hero-bg-image {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg,
      rgba(8, 12, 20, 0.3) 0%,
      rgba(8, 12, 20, 0.55) 40%,
      rgba(8, 12, 20, 0.85) 100%),
    linear-gradient(135deg,
      #0a1628 0%,
      #1a2d4a 25%,
      #2a4060 45%,
      #4a6888 60%,
      #8a6a50 75%,
      #c08060 85%,
      #d4a080 100%);
}

.hero-bg-image::before {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 55%;
  background:
    radial-gradient(ellipse 120% 80% at 50% 100%, rgba(180, 200, 220, 0.25) 0%, transparent 60%),
    linear-gradient(0deg, rgba(200, 210, 225, 0.15) 0%, transparent 50%);
}

.hero-bg-image::after {
  content: "";
  position: absolute;
  bottom: 15%;
  left: -10%;
  right: -10%;
  height: 40%;
  background:
    radial-gradient(ellipse 40% 60% at 20% 80%, rgba(60, 80, 110, 0.6) 0%, transparent 70%),
    radial-gradient(ellipse 35% 55% at 55% 70%, rgba(50, 70, 100, 0.5) 0%, transparent 70%),
    radial-gradient(ellipse 30% 50% at 80% 75%, rgba(40, 60, 90, 0.4) 0%, transparent 70%);
  filter: blur(2px);
}

.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: linear-gradient(180deg, transparent 0%, rgba(0,0,0,0.4) 50%, transparent 100%);
}

.hero-bg-glow {
  position: absolute;
  top: 20%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(110, 150, 190, 0.15) 0%, transparent 70%);
  animation: pulse 6s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.6; transform: translateX(-50%) scale(1); }
  50% { opacity: 1; transform: translateX(-50%) scale(1.1); }
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 140px 0 100px;
  max-width: 860px;
}

.hero-eyebrow {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.25em;
  color: var(--color-text-muted-on-dark);
  margin-bottom: 2rem;
}

.hero-title {
  font-size: clamp(2.4rem, 5.5vw, 4rem);
  font-weight: 300;
  letter-spacing: 0.06em;
  color: #fff;
  line-height: 1.3;
  margin-bottom: 1rem;
}

.hero-subtitle {
  font-size: clamp(0.9rem, 1.5vw, 1.1rem);
  font-weight: 300;
  letter-spacing: 0.12em;
  color: var(--color-text-muted-on-dark);
  margin-bottom: 2rem;
  text-transform: uppercase;
}

.hero-desc {
  font-size: 1rem;
  font-weight: 300;
  color: var(--color-text-muted-on-dark);
  max-width: 480px;
  margin: 0 auto 2.5rem;
  line-height: 1.9;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 4rem;
}

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2.5rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--color-border-dark);
}

.stat { text-align: center; }

.stat-num {
  display: block;
  font-size: 1.75rem;
  font-weight: 300;
  letter-spacing: 0.04em;
  color: #fff;
  margin-bottom: 0.25rem;
}

.stat-label {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--color-text-muted-on-dark);
  text-transform: uppercase;
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--color-border-dark);
}

.hero-scroll {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  color: var(--color-text-muted-on-dark);
  animation: bounce 2.5s ease-in-out infinite;
  z-index: 1;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* ===== Sections ===== */
.section { padding: 110px 0; }

.section-header { margin-bottom: 3.5rem; }

.section-header--center { text-align: center; }

.section-header--center p,
.section-lead {
  color: var(--color-text-muted);
  margin-top: 0.75rem;
  font-weight: 300;
}

.section-tag {
  display: block;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.section-header h2,
.product-copy h2,
.download-inner h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 300;
  letter-spacing: 0.04em;
  line-height: 1.4;
}

/* ===== Vision ===== */
.vision { background: var(--color-surface); }

.vision-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  grid-template-rows: auto auto;
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.vision-card {
  background: var(--color-surface);
  padding: 2.5rem;
  transition: background var(--transition);
}

.vision-card:hover { background: #fafbfc; }

.vision-card--main {
  grid-row: span 2;
  background: var(--color-dark);
  color: #fff;
  position: relative;
  overflow: hidden;
}

.vision-card--main:hover { background: var(--color-dark-2); }

.vision-card-glow {
  position: absolute;
  top: -50%;
  right: -30%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(107, 140, 174, 0.2) 0%, transparent 70%);
  pointer-events: none;
}

.vision-label {
  display: block;
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--color-primary-bright);
  margin-bottom: 1.5rem;
  text-transform: uppercase;
}

.vision-card--main h3 {
  font-size: 1.5rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

.vision-card--main p {
  font-size: 0.92rem;
  font-weight: 300;
  color: var(--color-text-muted-on-dark);
  line-height: 1.9;
}

.vision-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-primary);
  margin-bottom: 1.25rem;
}

.vision-card h4 {
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  margin-bottom: 0.5rem;
}

.vision-card p {
  font-size: 0.88rem;
  font-weight: 300;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ===== Product ===== */
.product { background: var(--color-bg); }

.product-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
}

.product-lead {
  font-size: 1rem;
  font-weight: 300;
  color: var(--color-text-muted);
  margin: 1.25rem 0 2.5rem;
  line-height: 1.9;
}

.product-lead strong {
  color: var(--color-text);
  font-weight: 500;
}

.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--color-border);
}

.feature-list li {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--color-border);
  transition: padding-left var(--transition);
}

.feature-list li:hover { padding-left: 0.5rem; }

.feature-num {
  flex-shrink: 0;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--color-primary);
  padding-top: 0.15rem;
}

.feature-list h4 {
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  margin-bottom: 0.3rem;
}

.feature-list p {
  font-size: 0.85rem;
  font-weight: 300;
  color: var(--color-text-muted);
}

.phone-mockup {
  position: relative;
  width: 280px;
  margin: 0 auto;
  padding: 10px;
  background: linear-gradient(160deg, #1a2030, #2a3548);
  border-radius: 40px;
  box-shadow:
    0 40px 80px rgba(8, 12, 20, 0.25),
    0 0 0 1px rgba(255, 255, 255, 0.06) inset;
}

.phone-glow {
  position: absolute;
  inset: -30%;
  background: radial-gradient(circle, rgba(107, 140, 174, 0.2) 0%, transparent 60%);
  pointer-events: none;
}

.phone-screen {
  background: var(--color-dark);
  border-radius: 32px;
  padding: 1.75rem 1.5rem;
  min-height: 440px;
}

.app-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.app-logo-img {
  width: 22px;
  height: 22px;
  filter: brightness(0) invert(1);
  opacity: 0.9;
}

.app-logo-text {
  font-size: 0.9rem;
  font-weight: 500;
  color: #fff;
  letter-spacing: 0.06em;
  flex: 1;
}

.app-status {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #4ade80;
  box-shadow: 0 0 8px rgba(74, 222, 128, 0.5);
}

.app-label {
  display: block;
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-muted-on-dark);
  margin-bottom: 0.5rem;
}

.app-card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1rem;
}

.app-greeting {
  font-size: 0.95rem;
  font-weight: 300;
  color: #fff;
  margin-bottom: 1rem;
}

.app-mood-bar {
  height: 3px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 2px;
  margin-bottom: 0.75rem;
  overflow: hidden;
}

.app-mood-bar span {
  display: block;
  height: 100%;
  width: var(--w, 70%);
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-bright));
  border-radius: 2px;
}

.app-mood {
  font-size: 0.78rem;
  color: var(--color-text-muted-on-dark);
  letter-spacing: 0.04em;
}

.app-practice-preview {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: rgba(107, 140, 174, 0.12);
  border: 1px solid rgba(107, 140, 174, 0.2);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
}

.app-practice-preview .app-label { margin: 0; flex: 1; }

.app-practice-preview strong {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--color-primary-bright);
  letter-spacing: 0.04em;
}

.app-practice-preview svg {
  color: var(--color-primary-bright);
  flex-shrink: 0;
}

/* ===== Practices ===== */
.practices { background: var(--color-surface); }

.practice-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.practice-card {
  background: var(--color-surface);
  padding: 2rem 1.5rem;
  transition: background var(--transition);
}

.practice-card:hover {
  background: var(--color-dark);
  color: #fff;
}

.practice-card:hover .practice-index { color: var(--color-primary-bright); }
.practice-card:hover p { color: var(--color-text-muted-on-dark); }

.practice-index {
  display: block;
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  color: var(--color-primary);
  margin-bottom: 1.5rem;
}

.practice-card h3 {
  font-size: 1.1rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  margin-bottom: 0.75rem;
}

.practice-card p {
  font-size: 0.82rem;
  font-weight: 300;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ===== Download ===== */
.download {
  background: var(--color-dark);
  color: #fff;
}

.download-inner { text-align: center; }

.download .section-tag { color: var(--color-primary-bright); }

.download-inner h2 {
  color: #fff;
  margin: 0.5rem 0 1rem;
}

.download-inner > p {
  font-weight: 300;
  color: var(--color-text-muted-on-dark);
  margin-bottom: 2.5rem;
}

.download-buttons,
.wecom-trial {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  width: 100%;
  margin-bottom: 1.5rem;
}

.wecom-qr-card {
  padding: 1rem;
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.18);
  flex-shrink: 0;
  margin-inline: auto;
}

.wecom-qr {
  display: block;
  width: 220px;
  height: 220px;
  margin-inline: auto;
  object-fit: contain;
}

.wecom-steps {
  list-style: none;
  padding: 0;
  margin: 0;
  width: fit-content;
  max-width: 100%;
}

.wecom-steps li {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  margin-bottom: 0.75rem;
  color: rgba(255, 255, 255, 0.88);
  font-weight: 300;
  line-height: 1.5;
  text-align: left;
}

.wecom-steps li:last-child {
  margin-bottom: 0;
}

.wecom-step-num {
  flex-shrink: 0;
  width: 1.75rem;
  height: 1.75rem;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 50%;
  font-size: 0.75rem;
  line-height: 1.75rem;
  text-align: center;
  color: var(--color-primary-bright);
}

.store-btn {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1.75rem;
  border: 1px solid var(--color-border-dark);
  border-radius: 2px;
  color: #fff;
  transition: all var(--transition);
}

.store-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.3);
}

.store-btn span {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  text-align: left;
}

.store-btn small {
  font-size: 0.6rem;
  letter-spacing: 0.05em;
  opacity: 0.6;
  text-transform: uppercase;
}

.store-btn strong {
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.download-hint {
  font-size: 0.72rem;
  color: var(--color-text-muted-on-dark);
  opacity: 0.5;
}

/* ===== Contact ===== */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.contact-card {
  background: var(--color-surface);
  text-align: center;
  padding: 3rem 1.5rem;
  transition: background var(--transition);
}

.contact-card:hover { background: #fafbfc; }

.contact-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  color: var(--color-primary);
  margin-bottom: 1.25rem;
}

.contact-card h4 {
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  margin-bottom: 0.5rem;
}

.contact-card p,
.contact-card a {
  font-size: 0.88rem;
  font-weight: 300;
  color: var(--color-text-muted);
}

.contact-card a:hover { color: var(--color-primary); }

/* ===== Footer ===== */
.site-footer {
  background: var(--color-dark);
  color: var(--color-text-muted-on-dark);
  padding: 3.5rem 0;
  text-align: center;
  border-top: 1px solid var(--color-border-dark);
}

.footer-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: #fff;
  margin-bottom: 0.75rem;
}

.logo-img--footer {
  filter: brightness(0) invert(1);
  opacity: 0.85;
}

.footer-tagline {
  font-size: 0.85rem;
  font-weight: 300;
  letter-spacing: 0.08em;
  color: var(--color-text-muted-on-dark);
  margin-bottom: 2rem;
}

.footer-copy {
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  opacity: 0.4;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .vision-grid { grid-template-columns: 1fr 1fr; }
  .vision-card--main { grid-column: span 2; grid-row: span 1; }
  .product-layout { grid-template-columns: 1fr; gap: 3rem; }
  .product-visual { order: -1; }
  .practice-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
  .nav-toggle { display: flex; }

  .nav-links {
    position: fixed;
    top: 76px;
    left: 0;
    right: 0;
    background: rgba(8, 12, 20, 0.97);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 1.5rem 2rem;
    gap: 0;
    border-bottom: 1px solid var(--color-border-dark);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition);
  }

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

  .nav-links li { border-bottom: 1px solid var(--color-border-dark); }
  .nav-links a { display: block; padding: 1rem 0; }

  .nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
  .nav-toggle.active span:nth-child(2) { opacity: 0; }
  .nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

  .hero-stats { flex-direction: column; gap: 1.5rem; }
  .stat-divider { width: 40px; height: 1px; }

  .section { padding: 80px 0; }

  .vision-grid,
  .practice-grid,
  .contact-grid { grid-template-columns: 1fr; }

  .vision-card--main { grid-column: span 1; }
}