/* Visual direction: Fresh ACG sky-mint — soft sky blue #4BA3E8, mint #3ECFB2, peach accent #FF9B85, cloud white surfaces */
:root {
  --sky: #4ba3e8;
  --sky-deep: #2f86d1;
  --mint: #3ecfb2;
  --mint-soft: #d8f7ef;
  --peach: #ff9b85;
  --ink: #1f2a37;
  --ink-soft: #5b6b7c;
  --line: rgba(47, 134, 209, 0.14);
  --bg: #f4f9ff;
  --bg-2: #eaf6ff;
  --surface: #ffffff;
  --shadow: 0 18px 40px rgba(47, 134, 209, 0.12);
  --radius: 22px;
  --max: 1120px;
  --font-display: "M PLUS Rounded 1c", "Noto Sans SC", sans-serif;
  --font-body: "Noto Sans SC", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 10% -10%, rgba(75, 163, 232, 0.22), transparent 60%),
    radial-gradient(900px 420px at 90% 0%, rgba(62, 207, 178, 0.18), transparent 55%),
    linear-gradient(180deg, var(--bg) 0%, #ffffff 45%, var(--bg-2) 100%);
  line-height: 1.7;
  min-height: 100vh;
}
img { max-width: 100%; display: block; }
a { color: var(--sky-deep); text-decoration: none; }
a:hover { color: var(--sky); }
.container { width: min(100% - 2rem, var(--max)); margin-inline: auto; }

.site-header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(16px);
  background: rgba(244, 249, 255, 0.86);
  border-bottom: 1px solid var(--line);
}
.nav-shell {
  width: min(100% - 1.5rem, var(--max));
  margin: 0 auto;
  min-height: 72px;
  display: flex; align-items: center; gap: 1rem;
}
.brand {
  display: inline-flex; align-items: center; gap: .7rem;
  font-family: var(--font-display); font-weight: 800; color: var(--ink);
  font-size: 1.25rem; letter-spacing: .02em;
}
.brand img { border-radius: 12px; }
.site-nav { margin-left: auto; }
.site-nav ul {
  display: flex; gap: .2rem; list-style: none; margin: 0; padding: 0;
}
.site-nav a {
  display: block; padding: .55rem .8rem; border-radius: 999px;
  color: var(--ink-soft); font-weight: 500; font-size: .95rem;
}
.site-nav a:hover, .site-nav a.active {
  color: var(--sky-deep); background: rgba(75, 163, 232, .12);
}
.nav-cta { display: flex; gap: .55rem; align-items: center; }
.nav-toggle {
  display: none; margin-left: auto; width: 44px; height: 44px;
  border: 1px solid var(--line); border-radius: 12px; background: #fff;
}
.nav-toggle span {
  display: block; width: 18px; height: 2px; margin: 4px auto;
  background: var(--ink); border-radius: 2px;
}

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 44px; padding: .7rem 1.2rem; border-radius: 999px;
  font-weight: 700; border: 1px solid transparent; transition: .2s ease;
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--sky), var(--mint));
  color: #fff !important; box-shadow: 0 10px 24px rgba(75, 163, 232, .28);
}
.btn-primary:hover { transform: translateY(-2px); filter: brightness(1.03); color: #fff !important; }
.btn-ghost {
  background: #fff; color: var(--sky-deep) !important; border-color: rgba(75,163,232,.28);
}
.btn-ghost:hover { background: var(--mint-soft); }
.btn-lg { min-height: 52px; padding: .85rem 1.55rem; font-size: 1.05rem; }

.hero {
  position: relative; overflow: hidden;
  padding: clamp(2.5rem, 6vw, 5rem) 0 clamp(3rem, 7vw, 5.5rem);
}
.hero-bg {
  position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(circle at 18% 30%, rgba(255,255,255,.9), transparent 28%),
    radial-gradient(circle at 78% 22%, rgba(62,207,178,.18), transparent 30%),
    linear-gradient(120deg, rgba(75,163,232,.12), transparent 45%);
}
.hero-grid {
  position: relative;
  display: grid; gap: 2rem; align-items: center;
}
.hero-copy { max-width: 640px; }
.eyebrow {
  display: inline-flex; align-items: center; gap: .45rem;
  padding: .35rem .8rem; border-radius: 999px;
  background: rgba(255,255,255,.8); border: 1px solid var(--line);
  color: var(--sky-deep); font-weight: 700; font-size: .88rem;
}
.hero h1 {
  margin: 1rem 0 .8rem;
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  line-height: 1.12; letter-spacing: .02em;
}
.hero h1 em {
  font-style: normal;
  background: linear-gradient(120deg, var(--sky-deep), var(--mint));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-lead {
  margin: 0 0 1.4rem; color: var(--ink-soft); font-size: 1.08rem; max-width: 34em;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-bottom: 1.6rem; }
.trust-row {
  display: flex; flex-wrap: wrap; gap: .7rem 1.2rem; color: var(--ink-soft); font-size: .92rem;
}
.trust-row strong { color: var(--ink); }

.hero-stage {
  position: relative; min-height: 320px;
  display: grid; place-items: center;
}
.stage-panel {
  width: min(100%, 420px);
  aspect-ratio: 3 / 4;
  border-radius: 36px;
  background: linear-gradient(160deg, #eaf6ff, #d8f7ef);
  border: 1px solid rgba(255,255,255,.8);
  box-shadow: var(--shadow);
  overflow: hidden;
  position: relative;
  animation: floaty 6s ease-in-out infinite;
}
.stage-panel img {
  width: 100%; height: 100%; object-fit: cover; object-position: center top;
}
.orb {
  position: absolute; border-radius: 50%; filter: blur(2px);
  animation: drift 8s ease-in-out infinite;
}
.orb-a { width: 90px; height: 90px; background: rgba(75,163,232,.25); top: 8%; right: 6%; }
.orb-b { width: 60px; height: 60px; background: rgba(62,207,178,.28); bottom: 12%; left: 4%; animation-delay: -2s; }

@keyframes floaty {
  0%,100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}
@keyframes drift {
  0%,100% { transform: translate(0,0); }
  50% { transform: translate(8px,-12px); }
}
@keyframes rise {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}
.reveal { animation: rise .7s ease both; }
.reveal-delay { animation-delay: .15s; }

.section { padding: clamp(3rem, 6vw, 5rem) 0; }
.section-head { max-width: 720px; margin-bottom: 2rem; }
.section-head h2 {
  margin: 0 0 .6rem;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.5vw, 2.4rem);
  line-height: 1.25;
}
.section-head p { margin: 0; color: var(--ink-soft); }

.metric-strip {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem;
  margin-top: -1.5rem; position: relative; z-index: 2;
}
.metric {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: 18px; padding: 1.1rem 1rem; text-align: center;
  box-shadow: 0 10px 24px rgba(47,134,209,.06);
}
.metric strong {
  display: block; font-family: var(--font-display);
  font-size: 1.55rem; color: var(--sky-deep); margin-bottom: .2rem;
}
.metric span { color: var(--ink-soft); font-size: .92rem; }

.feature-flow {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem;
}
.feature-item {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.4rem 1.25rem;
  transition: transform .2s ease, box-shadow .2s ease;
}
.feature-item:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.feature-item .icon {
  width: 48px; height: 48px; border-radius: 16px;
  display: grid; place-items: center; margin-bottom: .9rem;
  background: linear-gradient(135deg, rgba(75,163,232,.16), rgba(62,207,178,.18));
  color: var(--sky-deep); font-size: 1.25rem; font-weight: 800;
}
.feature-item h3 {
  margin: 0 0 .45rem; font-family: var(--font-display); font-size: 1.15rem;
}
.feature-item p { margin: 0; color: var(--ink-soft); font-size: .95rem; }

.genre-board {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem;
}
.genre {
  position: relative; overflow: hidden;
  border-radius: var(--radius); min-height: 170px;
  padding: 1.35rem; color: #fff;
  display: flex; flex-direction: column; justify-content: flex-end;
  border: 1px solid rgba(255,255,255,.35);
}
.genre h3 { margin: 0 0 .35rem; font-family: var(--font-display); font-size: 1.25rem; }
.genre p { margin: 0; opacity: .92; font-size: .92rem; }
.g1 { background: linear-gradient(145deg, #5aa8ea, #7ad7c5); }
.g2 { background: linear-gradient(145deg, #6ec3f0, #8fd3ff); }
.g3 { background: linear-gradient(145deg, #57d0b8, #7ad0ea); }
.g4 { background: linear-gradient(145deg, #ffb39f, #ffd0a8); }
.g5 { background: linear-gradient(145deg, #7bb8f0, #a8e0d4); }
.g6 { background: linear-gradient(145deg, #69c4e8, #9ad8c8); }

.soft-panel {
  background: rgba(255,255,255,.78);
  border: 1px solid var(--line);
  border-radius: 28px;
  padding: clamp(1.4rem, 3vw, 2rem);
  box-shadow: 0 12px 30px rgba(47,134,209,.06);
}

.split {
  display: grid; grid-template-columns: 1.1fr .9fr; gap: 1.5rem; align-items: stretch;
}
.checklist { list-style: none; margin: 1rem 0 0; padding: 0; }
.checklist li {
  position: relative; padding: .55rem 0 .55rem 1.7rem; color: var(--ink-soft);
}
.checklist li::before {
  content: ""; position: absolute; left: 0; top: .85rem;
  width: 12px; height: 12px; border-radius: 50%;
  background: linear-gradient(135deg, var(--sky), var(--mint));
}

.article-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem;
}
.article-card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: 20px; padding: 1.2rem 1.15rem;
  display: flex; flex-direction: column; gap: .55rem;
  transition: transform .2s ease, box-shadow .2s ease;
}
.article-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.tag {
  display: inline-flex; width: fit-content;
  padding: .2rem .55rem; border-radius: 999px;
  background: var(--mint-soft); color: #1f8f7c; font-size: .8rem; font-weight: 700;
}
.article-card h3 {
  margin: 0; font-size: 1.05rem; line-height: 1.4;
  font-family: var(--font-display);
}
.article-card h3 a { color: var(--ink); }
.article-card p { margin: 0; color: var(--ink-soft); font-size: .92rem; flex: 1; }
.article-card .more { font-weight: 700; color: var(--sky-deep); }

.faq-list { display: grid; gap: .8rem; }
.faq-item {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: 16px; overflow: hidden;
}
.faq-item summary {
  cursor: pointer; list-style: none; padding: 1rem 1.15rem;
  font-weight: 700; font-family: var(--font-display);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item[open] summary { color: var(--sky-deep); }
.faq-item p { margin: 0; padding: 0 1.15rem 1.1rem; color: var(--ink-soft); }

.cta-band {
  margin: 1rem 0 0;
  border-radius: 30px;
  padding: clamp(1.8rem, 4vw, 2.6rem);
  background:
    linear-gradient(135deg, rgba(75,163,232,.95), rgba(62,207,178,.92));
  color: #fff; text-align: center;
  box-shadow: var(--shadow);
}
.cta-band h2 {
  margin: 0 0 .6rem; font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
}
.cta-band p { margin: 0 0 1.2rem; opacity: .95; }
.cta-band .btn-primary {
  background: #fff; color: var(--sky-deep) !important;
  box-shadow: none;
}
.cta-band .btn-ghost {
  background: transparent; color: #fff !important; border-color: rgba(255,255,255,.55);
}
.cta-actions { display: flex; justify-content: center; flex-wrap: wrap; gap: .8rem; }

.page-hero {
  padding: 2.4rem 0 1.2rem;
}
.page-hero h1 {
  margin: .7rem 0 .6rem;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  line-height: 1.2;
}
.page-hero p { margin: 0; color: var(--ink-soft); max-width: 42em; }

.content-grid {
  display: grid; grid-template-columns: 1.2fr .8fr; gap: 1.2rem;
}
.side-card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: 20px; padding: 1.2rem; position: sticky; top: 92px;
}
.side-card h3 { margin: 0 0 .7rem; font-family: var(--font-display); }
.side-card ul { margin: 0; padding-left: 1.1rem; color: var(--ink-soft); }
.side-card li { margin: .35rem 0; }

.steps { display: grid; gap: .9rem; }
.step {
  display: grid; grid-template-columns: 48px 1fr; gap: .9rem;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: 18px; padding: 1rem 1.1rem;
}
.step-num {
  width: 48px; height: 48px; border-radius: 14px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--sky), var(--mint));
  color: #fff; font-weight: 800; font-family: var(--font-display);
}
.step h3 { margin: 0 0 .25rem; font-size: 1.05rem; font-family: var(--font-display); }
.step p { margin: 0; color: var(--ink-soft); font-size: .94rem; }

.table-wrap { overflow-x: auto; border-radius: 16px; border: 1px solid var(--line); }
table {
  width: 100%; border-collapse: collapse; background: #fff; min-width: 520px;
}
th, td { padding: .85rem 1rem; text-align: left; border-bottom: 1px solid var(--line); }
th { background: #eef7ff; color: var(--sky-deep); font-weight: 700; }
tr:last-child td { border-bottom: 0; }

.price-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; }
.price-card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: 24px; padding: 1.4rem;
}
.price-card.featured {
  border-color: rgba(75,163,232,.45);
  box-shadow: var(--shadow);
  background: linear-gradient(180deg, #ffffff, #f0faff);
}
.price-card h3 { margin: 0 0 .3rem; font-family: var(--font-display); }
.price-card .price {
  font-family: var(--font-display); font-size: 1.8rem; color: var(--sky-deep); margin: .4rem 0 1rem;
}
.price-card ul { margin: 0 0 1.2rem; padding-left: 1.1rem; color: var(--ink-soft); }

.article-page { padding-bottom: 3rem; }
.article-body {
  background: rgba(255,255,255,.86); border: 1px solid var(--line);
  border-radius: 24px; padding: clamp(1.3rem, 3vw, 2rem);
}
.article-body h2 {
  margin: 1.6rem 0 .7rem; font-family: var(--font-display); font-size: 1.35rem;
}
.article-body h3 { margin: 1.2rem 0 .5rem; font-size: 1.08rem; }
.article-body p, .article-body li { color: var(--ink-soft); }
.article-body ul, .article-body ol { padding-left: 1.2rem; }
.lead { font-size: 1.05rem; color: var(--ink) !important; }
.meta-line { color: var(--ink-soft); font-size: .9rem; margin: .4rem 0 1.2rem; }
.related {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: .8rem; margin-top: 1.2rem;
}
.related a {
  display: block; background: #fff; border: 1px solid var(--line);
  border-radius: 14px; padding: .9rem; color: var(--ink); font-weight: 600;
}

.site-footer {
  margin-top: 2rem; padding: 2.5rem 0 1.2rem;
  background: linear-gradient(180deg, transparent, rgba(75,163,232,.08));
  border-top: 1px solid var(--line);
}
.footer-grid {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 1.4rem;
}
.footer-brand p { color: var(--ink-soft); font-size: .92rem; }
.site-footer h3 {
  margin: 0 0 .7rem; font-size: 1rem; font-family: var(--font-display);
}
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin: .35rem 0; }
.site-footer a { color: var(--ink-soft); }
.site-footer a:hover { color: var(--sky-deep); }
.footer-bottom {
  width: min(100% - 2rem, var(--max)); margin: 1.6rem auto 0;
  padding-top: 1rem; border-top: 1px solid var(--line);
  color: var(--ink-soft); font-size: .85rem;
}
.back-top {
  position: fixed; right: 1rem; bottom: 1rem; z-index: 40;
  width: 44px; height: 44px; border-radius: 50%;
  display: grid; place-items: center;
  background: #fff; border: 1px solid var(--line); color: var(--sky-deep);
  box-shadow: var(--shadow); opacity: 0; pointer-events: none; transition: .2s;
}
.back-top.show { opacity: 1; pointer-events: auto; }

@media (max-width: 960px) {
  .metric-strip, .feature-flow, .genre-board, .article-grid, .price-grid, .related, .footer-grid, .split, .content-grid {
    grid-template-columns: 1fr 1fr;
  }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .side-card { position: static; }
}
@media (max-width: 760px) {
  .nav-toggle { display: inline-block; }
  .site-nav, .nav-cta { display: none; }
  body.nav-open .site-nav {
    display: block; position: absolute; left: 0; right: 0; top: 72px;
    background: rgba(255,255,255,.98); border-bottom: 1px solid var(--line);
    padding: .8rem 1rem 1rem;
  }
  body.nav-open .site-nav ul { flex-direction: column; }
  body.nav-open .nav-cta {
    display: flex; position: absolute; left: 1rem; right: 1rem; top: calc(72px + 280px);
    padding-bottom: 1rem;
  }
  .metric-strip, .feature-flow, .genre-board, .article-grid, .price-grid, .related, .footer-grid, .split, .content-grid {
    grid-template-columns: 1fr;
  }
  .hero-actions .btn, .cta-actions .btn, .nav-cta .btn { width: 100%; }
}