:root {
  color-scheme: light;
  --paper: #fbf7ef;
  --paper-deep: #f2eadb;
  --ink: #27231f;
  --muted: #6e675d;
  --line: rgba(82, 70, 54, 0.14);
  --glass: rgba(255, 255, 255, 0.62);
  --blue: #658db5;
  --green: #79a89e;
  --violet: #9a91ba;
  --coral: #e28c73;
  --gold: #e4ad58;
  --shadow: 0 24px 70px rgba(96, 73, 38, 0.13);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 4%, rgba(228, 173, 88, 0.15), transparent 28rem),
    radial-gradient(circle at 92% 28%, rgba(101, 141, 181, 0.13), transparent 26rem),
    linear-gradient(145deg, var(--paper), #fffdf8 48%, var(--paper-deep));
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Hiragino Sans", "Yu Gothic", sans-serif;
  font-size: 16px;
  line-height: 1.65;
}

a { color: inherit; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: rgba(251, 247, 239, 0.78);
  backdrop-filter: blur(22px) saturate(145%);
}

.nav {
  width: min(1120px, calc(100% - 32px));
  min-height: 68px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 720;
  letter-spacing: -0.02em;
}

.brand img {
  width: 38px;
  height: 38px;
  border-radius: 11px;
  box-shadow: 0 7px 18px rgba(90, 69, 35, 0.16);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-left: auto;
}

.nav-links a {
  color: var(--muted);
  font-size: 0.92rem;
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] { color: var(--ink); }

.language {
  min-height: 38px;
  padding: 0 30px 0 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.72);
  font: inherit;
  font-size: 0.9rem;
}

main { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }

.hero {
  min-height: calc(100vh - 68px);
  display: grid;
  grid-template-columns: minmax(0, 1.03fr) minmax(340px, 0.97fr);
  gap: clamp(36px, 7vw, 88px);
  align-items: center;
  padding: 72px 0 92px;
}

.eyebrow {
  margin: 0 0 18px;
  color: #806e52;
  font-size: 0.82rem;
  font-weight: 720;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

h1, h2, h3, p { margin-top: 0; }

h1 {
  max-width: 760px;
  margin-bottom: 22px;
  font-size: clamp(3.15rem, 7vw, 6.8rem);
  line-height: 0.96;
  letter-spacing: -0.065em;
  font-weight: 760;
}

.lead {
  max-width: 650px;
  margin-bottom: 30px;
  color: var(--muted);
  font-size: clamp(1.08rem, 2vw, 1.3rem);
}

.actions { display: flex; flex-wrap: wrap; gap: 12px; }

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: 999px;
  background: var(--ink);
  color: #fffdf8;
  text-decoration: none;
  font-weight: 680;
}

.button.secondary {
  border-color: var(--line);
  background: var(--glass);
  color: var(--ink);
  backdrop-filter: blur(18px);
}

.dial-stage {
  position: relative;
  display: grid;
  place-items: center;
  aspect-ratio: 1;
}

.dial-stage::before {
  content: "";
  position: absolute;
  inset: 8%;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.48);
  box-shadow: var(--shadow), inset 0 1px 0 rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(20px);
}

.app-icon {
  position: relative;
  width: min(80%, 450px);
  height: auto;
  border-radius: 25%;
  box-shadow: 0 35px 90px rgba(99, 74, 34, 0.2);
}

.ribbon {
  position: absolute;
  right: 0;
  bottom: 12%;
  width: 58%;
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.7);
  box-shadow: 0 20px 50px rgba(70, 55, 35, 0.12);
  backdrop-filter: blur(18px);
}

.ribbon-label { display: flex; justify-content: space-between; color: var(--muted); font-size: 0.78rem; }
.ribbon-track { display: grid; grid-template-columns: 1.4fr .7fr 1fr .65fr .9fr; gap: 4px; margin-top: 9px; }
.ribbon-track span { height: 12px; border-radius: 999px; }
.ribbon-track span:nth-child(1) { background: var(--blue); }
.ribbon-track span:nth-child(2) { background: var(--green); }
.ribbon-track span:nth-child(3) { background: var(--gold); }
.ribbon-track span:nth-child(4) { background: var(--coral); }
.ribbon-track span:nth-child(5) { background: var(--violet); }

.section { padding: 82px 0; border-top: 1px solid var(--line); }
.section-heading { max-width: 680px; margin-bottom: 34px; }
.section h2 { font-size: clamp(2rem, 4vw, 3.4rem); line-height: 1.08; letter-spacing: -0.045em; }
.section-heading p, .muted { color: var(--muted); }

.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card {
  padding: 26px;
  border: 1px solid rgba(255, 255, 255, 0.75);
  border-radius: 28px;
  background: var(--glass);
  box-shadow: 0 14px 40px rgba(88, 67, 35, 0.07);
  backdrop-filter: blur(20px);
}
.card-mark { width: 38px; height: 8px; margin-bottom: 22px; border-radius: 999px; background: var(--blue); }
.card:nth-child(2) .card-mark { background: var(--coral); }
.card:nth-child(3) .card-mark { background: var(--green); }
.card h3 { margin-bottom: 8px; font-size: 1.18rem; }
.card p { margin-bottom: 0; color: var(--muted); }

.page-intro { max-width: 760px; padding: 92px 0 54px; }
.page-intro h1 { font-size: clamp(2.9rem, 7vw, 5.8rem); }
.page-intro .lead { margin-bottom: 0; }
.content-grid { display: grid; grid-template-columns: 0.62fr 1.38fr; gap: 46px; padding-bottom: 96px; }
.side-note { color: var(--muted); }
.article { padding: clamp(26px, 5vw, 52px); }
.article h2 { margin-top: 42px; margin-bottom: 12px; font-size: 1.45rem; letter-spacing: -0.025em; }
.article h2:first-child { margin-top: 0; }
.article ul { padding-left: 1.3em; }
.article li + li { margin-top: 10px; }
.article a { text-decoration-thickness: 1px; text-underline-offset: 3px; }

.faq { display: grid; gap: 12px; }
details { border: 1px solid var(--line); border-radius: 20px; background: rgba(255,255,255,.48); }
summary { padding: 20px 22px; cursor: pointer; font-weight: 680; }
details p { padding: 0 22px 20px; margin: 0; color: var(--muted); }

.contact-card { margin-top: 28px; padding: 28px; border-radius: 28px; background: var(--ink); color: #fffdf8; }
.contact-card p { color: rgba(255,255,255,.72); }
.contact-card a { color: #fffdf8; }

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
}
.footer-inner {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 44px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 14px 28px;
}
.footer-links { display: flex; flex-wrap: wrap; gap: 18px; }
.footer-links a { text-underline-offset: 3px; }

@media (max-width: 820px) {
  .hero { grid-template-columns: 1fr; min-height: auto; padding-top: 54px; }
  .dial-stage { width: min(560px, 100%); margin: 0 auto; }
  .feature-grid { grid-template-columns: 1fr; }
  .content-grid { grid-template-columns: 1fr; gap: 20px; }
  .side-note { max-width: 600px; }
}

@media (max-width: 620px) {
  .nav { min-height: 62px; gap: 10px; }
  .brand span { display: none; }
  .nav-links { gap: 12px; }
  .nav-links a { font-size: 0.86rem; }
  .language { width: 78px; }
  .hero { padding: 48px 0 64px; }
  h1 { font-size: clamp(3rem, 17vw, 4.8rem); }
  .ribbon { right: 2%; width: 64%; padding: 13px; }
  .section { padding: 64px 0; }
  .page-intro { padding-top: 64px; }
  .article { border-radius: 24px; }
}

@media (prefers-reduced-motion: no-preference) {
  .app-icon { animation: breathe 7s ease-in-out infinite; }
  .ribbon { animation: float 6s ease-in-out infinite; }
  @keyframes breathe { 50% { transform: translateY(-8px) rotate(0.7deg); } }
  @keyframes float { 50% { transform: translateY(7px); } }
}

@media (prefers-color-scheme: dark) {
  :root { color-scheme: dark; --paper: #171613; --paper-deep: #1e1b17; --ink: #f6efe3; --muted: #bcb2a2; --line: rgba(255,255,255,.11); --glass: rgba(41,38,33,.66); }
  body { background: radial-gradient(circle at 10% 0%, rgba(228,173,88,.1), transparent 28rem), radial-gradient(circle at 90% 28%, rgba(101,141,181,.1), transparent 26rem), linear-gradient(145deg, var(--paper), #131210 48%, var(--paper-deep)); }
  .site-header { background: rgba(23,22,19,.8); }
  .language { background: rgba(46,43,38,.76); }
  .dial-stage::before, .ribbon, details { background: rgba(42,39,34,.68); border-color: rgba(255,255,255,.1); }
  .card { border-color: rgba(255,255,255,.09); }
  .button { background: #f3eadc; color: #26221d; }
  .button.secondary { color: var(--ink); background: var(--glass); }
  .contact-card { background: #f2eadf; color: #26221d; }
  .contact-card p { color: #6c6257; }
  .contact-card a { color: #26221d; }
}