:root {
  --ink: #10243a;
  --muted: #617286;
  --brand: #1a6b85;
  --brand-deep: #124d66;
  --accent: #e58a55;
  --mint: #cce9e5;
  --surface: #ffffff;
  --surface-soft: #f4f8f8;
  --line: #dce7e8;
  --shadow: 0 24px 70px rgba(21, 67, 80, 0.12);
  --radius-lg: 32px;
  --radius-md: 22px;
  --radius-sm: 14px;
  --max-width: 1160px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--surface-soft);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", "Noto Sans JP", sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -2;
  content: "";
  background:
    radial-gradient(circle at 10% 5%, rgba(143, 209, 201, 0.28), transparent 28rem),
    radial-gradient(circle at 90% 14%, rgba(229, 138, 85, 0.14), transparent 24rem),
    linear-gradient(180deg, #f8fbfa 0%, #eef5f5 100%);
}

a {
  color: var(--brand);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

a:hover {
  color: var(--brand-deep);
}

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

button,
select {
  font: inherit;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  padding: 9px 14px;
  color: #fff;
  background: var(--brand-deep);
  border-radius: 10px;
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(220, 231, 232, 0.82);
  background: rgba(248, 251, 250, 0.9);
  backdrop-filter: blur(18px);
}

.nav-shell,
.content-shell {
  width: min(calc(100% - 40px), var(--max-width));
  margin-inline: auto;
}

.nav-shell {
  min-height: 76px;
  display: flex;
  align-items: center;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  font-size: 1.04rem;
  font-weight: 760;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  box-shadow: 0 8px 22px rgba(21, 67, 80, 0.18);
}

.brand small {
  display: block;
  margin-top: -5px;
  color: var(--muted);
  font-size: 0.67rem;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}

.main-nav a {
  padding: 8px 12px;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 650;
  text-decoration: none;
  border-radius: 10px;
}

.main-nav a:hover,
.main-nav a[aria-current="page"] {
  color: var(--brand-deep);
  background: rgba(204, 233, 229, 0.58);
}

.language-select {
  min-width: 118px;
  padding: 8px 32px 8px 11px;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 11px;
  cursor: pointer;
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 9px;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 11px;
}

.menu-toggle span {
  display: block;
  height: 2px;
  margin: 4px 0;
  background: currentColor;
  border-radius: 2px;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 82px 0 72px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.04fr 0.96fr;
  align-items: center;
  gap: clamp(44px, 8vw, 96px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 18px;
  padding: 7px 12px;
  color: var(--brand-deep);
  background: rgba(204, 233, 229, 0.66);
  border: 1px solid rgba(26, 107, 133, 0.15);
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 750;
  letter-spacing: 0.035em;
}

.eyebrow::before {
  width: 7px;
  height: 7px;
  content: "";
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(229, 138, 85, 0.15);
}

.hero h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(2.7rem, 6vw, 5rem);
  line-height: 1.04;
  letter-spacing: -0.055em;
}

.hero h1 span {
  color: var(--brand);
}

.hero-copy {
  max-width: 650px;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.22rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 11px 18px;
  color: #fff;
  background: var(--brand-deep);
  border: 1px solid var(--brand-deep);
  border-radius: 13px;
  font-weight: 740;
  text-decoration: none;
  box-shadow: 0 10px 24px rgba(18, 77, 102, 0.17);
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.button:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(18, 77, 102, 0.23);
}

.button.secondary {
  color: var(--brand-deep);
  background: rgba(255, 255, 255, 0.72);
  border-color: var(--line);
  box-shadow: none;
}

.hero-note {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 0.84rem;
}

.app-visual {
  position: relative;
  min-height: 470px;
  display: grid;
  place-items: center;
}

.app-visual::before {
  position: absolute;
  width: 430px;
  height: 430px;
  content: "";
  background: linear-gradient(145deg, rgba(204, 233, 229, 0.96), rgba(229, 138, 85, 0.18));
  border-radius: 47% 53% 63% 37% / 44% 42% 58% 56%;
  filter: drop-shadow(0 28px 44px rgba(31, 88, 99, 0.15));
  animation: float-shape 9s ease-in-out infinite alternate;
}

.app-icon-large {
  position: relative;
  z-index: 2;
  width: min(66vw, 286px);
  border: 10px solid rgba(255, 255, 255, 0.62);
  border-radius: 30%;
  box-shadow: 0 34px 65px rgba(29, 72, 84, 0.26);
  transform: rotate(-3deg);
}

.visual-chip {
  position: absolute;
  z-index: 3;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 14px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.95);
  border-radius: 15px;
  font-size: 0.85rem;
  font-weight: 720;
  box-shadow: 0 14px 35px rgba(28, 72, 82, 0.14);
  backdrop-filter: blur(12px);
}

.visual-chip::before {
  width: 9px;
  height: 9px;
  content: "";
  background: var(--accent);
  border-radius: 50%;
}

.chip-one { top: 52px; right: 6px; }
.chip-two { bottom: 58px; left: 0; }

@keyframes float-shape {
  to { transform: rotate(5deg) scale(1.025); }
}

.section {
  padding: 80px 0;
}

.section-heading {
  max-width: 720px;
  margin-bottom: 36px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.25rem);
  line-height: 1.12;
  letter-spacing: -0.04em;
}

.section-heading p {
  margin: 15px 0 0;
  color: var(--muted);
  font-size: 1.06rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.feature-card {
  min-height: 220px;
  padding: 26px;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(220, 231, 232, 0.92);
  border-radius: var(--radius-md);
  box-shadow: 0 12px 35px rgba(31, 78, 89, 0.06);
}

.feature-icon {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  color: var(--brand-deep);
  background: var(--mint);
  border-radius: 14px;
  font-size: 1.28rem;
  font-weight: 800;
}

.feature-card:nth-child(2n) .feature-icon {
  color: #8b4d2d;
  background: #f7ddcc;
}

.feature-card h3 {
  margin: 20px 0 8px;
  font-size: 1.12rem;
  line-height: 1.3;
}

.feature-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
}

.privacy-band {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 36px;
  align-items: center;
  padding: clamp(30px, 6vw, 60px);
  color: #fff;
  background: var(--brand-deep);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.privacy-band h2 {
  margin: 0;
  font-size: clamp(1.9rem, 4vw, 3rem);
  line-height: 1.15;
  letter-spacing: -0.04em;
}

.privacy-band p {
  margin: 15px 0 0;
  color: rgba(255, 255, 255, 0.76);
}

.privacy-points {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.privacy-points li {
  position: relative;
  padding: 13px 15px 13px 42px;
  color: #eaf8f6;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 13px;
}

.privacy-points li::before {
  position: absolute;
  top: 13px;
  left: 14px;
  content: "✓";
  color: #9dded5;
  font-weight: 900;
}

.notice {
  margin-top: 48px;
  padding: 22px 24px;
  background: #fff7ee;
  border: 1px solid #f0d3bd;
  border-radius: var(--radius-sm);
}

.notice strong {
  display: block;
  color: #7c4326;
}

.notice p {
  margin: 6px 0 0;
  color: #745c4f;
}

.site-footer {
  margin-top: 60px;
  padding: 38px 0;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.footer-grid {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.footer-links a {
  color: var(--muted);
  font-size: 0.9rem;
  text-decoration: none;
}

/* Policy pages */
.policy-main {
  padding: 54px 0 20px;
}

.policy-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 28px;
  align-items: start;
}

.policy-card {
  padding: clamp(28px, 6vw, 64px);
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.policy-card h1 {
  margin: 0;
  font-size: clamp(2.4rem, 6vw, 4.25rem);
  line-height: 1.08;
  letter-spacing: -0.05em;
}

.policy-intro {
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 1.08rem;
}

.updated {
  display: inline-block;
  margin: 22px 0 14px;
  padding: 6px 11px;
  color: var(--brand-deep);
  background: var(--mint);
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 720;
}

.policy-card h2 {
  margin: 44px 0 12px;
  padding-top: 8px;
  font-size: 1.45rem;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

.policy-card p,
.policy-card li {
  color: #3f5367;
}

.policy-card ul {
  padding-left: 1.35rem;
}

.policy-card li + li {
  margin-top: 8px;
}

.policy-callout {
  margin: 26px 0 0;
  padding: 18px 20px;
  background: #fff7ee;
  border-left: 4px solid var(--accent);
  border-radius: 6px 14px 14px 6px;
}

.policy-callout p {
  margin: 0;
}

.policy-toc {
  position: sticky;
  top: 104px;
  padding: 21px;
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  backdrop-filter: blur(16px);
}

.policy-toc strong {
  display: block;
  margin-bottom: 10px;
  font-size: 0.83rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.policy-toc a {
  display: block;
  padding: 5px 0;
  color: var(--muted);
  font-size: 0.87rem;
  text-decoration: none;
}

.policy-toc a:hover {
  color: var(--brand-deep);
}

@media (max-width: 900px) {
  .hero-grid,
  .privacy-band,
  .policy-layout {
    grid-template-columns: 1fr;
  }

  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .app-visual {
    min-height: 390px;
  }

  .policy-toc {
    display: none;
  }
}

@media (max-width: 720px) {
  .nav-shell,
  .content-shell {
    width: min(calc(100% - 28px), var(--max-width));
  }

  .nav-shell {
    min-height: 68px;
    flex-wrap: wrap;
  }

  .menu-toggle {
    display: block;
    margin-left: auto;
  }

  .main-nav {
    order: 3;
    width: 100%;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 0 0 14px;
  }

  .main-nav[data-open="true"] {
    display: flex;
  }

  .language-select {
    width: 100%;
    margin-top: 5px;
  }

  .hero {
    padding: 54px 0 48px;
  }

  .hero h1 {
    font-size: clamp(2.55rem, 13vw, 4rem);
  }

  .app-visual::before {
    width: min(84vw, 370px);
    height: min(84vw, 370px);
  }

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

  .feature-card {
    min-height: auto;
  }

  .section {
    padding: 58px 0;
  }

  .footer-grid {
    align-items: flex-start;
    flex-direction: column;
  }

  .policy-main {
    padding-top: 28px;
  }

  .policy-card {
    border-radius: 24px;
  }

  .chip-one { top: 34px; right: 0; }
  .chip-two { bottom: 35px; left: 0; }
}

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