@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700&display=swap');

/* ===== Reset & Base ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --blue: #c8e0f4;
  --pink: #f5e0e8;
  --dark: #171f26;
  --blue-light: #ddeefa;
  --blue-dark: #9bbedd;
  --pink-light: #faeef3;
  --pink-dark: #ddb8c8;
  --dark-mid: #232e3b;
  --dark-light: #2e3f52;
  --text-main: #171f26;
  --text-muted: #4a6070;
  --text-light: #8aa4b8;
  --white: #ffffff;
  --nav-w: 240px;
  --radius: 18px;
  --radius-sm: 12px;
  --radius-xs: 8px;
  --shadow-neu-out:
    -5px -5px 15px rgba(255,255,255,0.85),
    5px 5px 15px rgba(140,170,200,0.35);
  --shadow-neu-in:
    inset -3px -3px 8px rgba(255,255,255,0.8),
    inset 3px 3px 8px rgba(140,170,200,0.4);
  --shadow-dark-out:
    -4px -4px 12px rgba(35,55,80,0.6),
    4px 4px 12px rgba(0,0,0,0.5);
  --transition: 150ms ease;
  --font: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  scroll-padding-top: 20px;
}

body.neu-body {
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-main);
  background: var(--blue);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ===== Page Wrapper ===== */
.page-wrapper {
  display: flex;
  min-height: 100vh;
}

/* ===== Sidenav ===== */
.sidenav {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--nav-w);
  height: 100vh;
  background: linear-gradient(160deg, var(--blue-light) 0%, var(--blue) 100%);
  box-shadow: var(--shadow-neu-out);
  display: flex;
  flex-direction: column;
  z-index: 100;
  overflow-y: auto;
  overflow-x: hidden;
}

.sidenav[open] .nav-toggle-icon span:nth-child(1) { transform: rotate(45deg) translate(4px, 4px); }
.sidenav[open] .nav-toggle-icon span:nth-child(2) { opacity: 0; }
.sidenav[open] .nav-toggle-icon span:nth-child(3) { transform: rotate(-45deg) translate(4px, -4px); }

.sidenav-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 20px 16px;
  cursor: pointer;
  list-style: none;
  user-select: none;
}

.sidenav-summary::-webkit-details-marker { display: none; }

.sidenav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-link {
  text-decoration: none;
  display: flex;
  align-items: center;
}

.site-logo-img {
  width: 36px;
  height: 36px;
  object-fit: contain;
  border-radius: var(--radius-xs);
}

.logo-text {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--dark);
  letter-spacing: -0.5px;
}

.brand-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
  line-height: 1.2;
  max-width: 120px;
}

.nav-toggle-icon {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 6px;
}

.nav-toggle-icon span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--dark);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
  transform-origin: center;
}

.sidenav-announce {
  margin: 0 16px 12px;
  padding: 8px 14px;
  background: linear-gradient(135deg, var(--pink-light), var(--pink));
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--dark);
  text-align: center;
  box-shadow: var(--shadow-neu-in);
  letter-spacing: 0.03em;
}

.sidenav-menu {
  list-style: none;
  padding: 8px 12px 24px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sidenav-menu li a {
  display: flex;
  align-items: center;
  padding: 11px 16px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: var(--text-main);
  font-size: 0.92rem;
  font-weight: 500;
  transition: box-shadow var(--transition), transform var(--transition), background var(--transition);
  min-height: 44px;
}

.sidenav-menu li a:hover {
  background: linear-gradient(145deg, var(--blue-light), var(--blue));
  box-shadow: var(--shadow-neu-out);
  transform: translateX(2px);
  color: var(--dark);
}

.sidenav-menu li a:active {
  box-shadow: var(--shadow-neu-in);
  transform: scale(0.98);
}

/* ===== Content Shift ===== */
.content-shift {
  margin-left: var(--nav-w);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ===== Hero Section ===== */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  background: linear-gradient(135deg, var(--blue-light) 0%, var(--blue) 50%, var(--pink-light) 100%);
  overflow: hidden;
  scroll-margin-top: 0;
}

.hero-aside {
  position: absolute;
  top: 32px;
  right: 32px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: flex-end;
  z-index: 5;
}

.hero-badge {
  padding: 6px 16px;
  border-radius: 40px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  background: linear-gradient(145deg, var(--blue-light), var(--blue));
  box-shadow: var(--shadow-neu-out);
  color: var(--text-main);
  white-space: nowrap;
}

.hero-badge.secondary {
  background: linear-gradient(145deg, var(--pink-light), var(--pink));
}

.hero-badge.accent {
  background: linear-gradient(145deg, var(--blue), var(--blue-dark));
  color: var(--dark);
}

.hero-body {
  text-align: center;
  max-width: 680px;
  padding: 0 24px;
  z-index: 5;
  position: relative;
}

.hero-h1 {
  font-size: clamp(2.2rem, 6vw, 4rem);
  font-weight: 700;
  color: var(--dark);
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
  text-shadow: 1px 1px 0 rgba(255,255,255,0.6);
}

.hero-sub {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin-bottom: 36px;
  line-height: 1.7;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta-row {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-deco {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  overflow: hidden;
}

.deco-circle {
  position: absolute;
  border-radius: 50%;
  opacity: 0.4;
}

.deco-circle.c1 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--pink-light), transparent 70%);
  top: -100px;
  right: -80px;
  animation: floatA 8s ease-in-out infinite;
}

.deco-circle.c2 {
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, var(--blue-light), transparent 70%);
  bottom: -60px;
  left: 10%;
  animation: floatB 10s ease-in-out infinite;
}

.deco-circle.c3 {
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, var(--pink), transparent 70%);
  top: 30%;
  left: -60px;
  animation: floatA 12s ease-in-out infinite reverse;
}

@keyframes floatA {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-20px); }
}

@keyframes floatB {
  0%, 100% { transform: translateY(0px) translateX(0px); }
  50% { transform: translateY(-15px) translateX(10px); }
}

@media (prefers-reduced-motion: reduce) {
  .deco-circle { animation: none; }
  * { transition: none !important; }
}

/* ===== Buttons ===== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 28px;
  border-radius: var(--radius);
  background: linear-gradient(145deg, var(--pink), var(--pink-dark));
  color: var(--dark);
  font-family: var(--font);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  box-shadow: var(--shadow-neu-out);
  transition: box-shadow var(--transition), transform var(--transition);
  min-height: 44px;
  letter-spacing: 0.01em;
}

.btn-primary:hover {
  box-shadow:
    -6px -6px 18px rgba(255,255,255,0.9),
    6px 6px 18px rgba(180,140,160,0.45);
  transform: translateY(-2px);
}

.btn-primary:active {
  box-shadow: var(--shadow-neu-in);
  transform: scale(0.97);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 28px;
  border-radius: var(--radius);
  background: linear-gradient(145deg, var(--blue-light), var(--blue));
  color: var(--text-main);
  font-family: var(--font);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  box-shadow: var(--shadow-neu-out);
  transition: box-shadow var(--transition), transform var(--transition);
  min-height: 44px;
}

.btn-ghost:hover {
  box-shadow:
    -6px -6px 18px rgba(255,255,255,0.9),
    6px 6px 18px rgba(140,170,200,0.5);
  transform: translateY(-2px);
}

.btn-ghost:active {
  box-shadow: var(--shadow-neu-in);
  transform: scale(0.97);
}

/* ===== Content Main Section ===== */
.content-main-section {
  display: flex;
  gap: 0;
  background: linear-gradient(180deg, var(--blue) 0%, var(--blue-light) 100%);
  min-height: 60vh;
  position: relative;
}

/* ===== Content Aside ===== */
.content-aside {
  width: 220px;
  flex-shrink: 0;
  padding: 40px 16px 40px 24px;
}

.aside-sticky {
  position: sticky;
  top: 24px;
}

.aside-eyebrow,
.tip-label {
  display: block;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-light);
  margin-bottom: 6px;
}

.aside-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 16px;
}

.aside-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 28px;
}

.aside-nav-list li a {
  display: block;
  padding: 8px 12px;
  border-radius: var(--radius-xs);
  font-size: 0.84rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition), box-shadow var(--transition), background var(--transition);
  min-height: 40px;
  line-height: 1.5;
  display: flex;
  align-items: center;
}

.aside-nav-list li a:hover {
  color: var(--dark);
  background: linear-gradient(145deg, var(--blue-light), var(--blue));
  box-shadow: var(--shadow-neu-out);
}

.aside-tip {
  padding: 14px;
  border-radius: var(--radius-sm);
  background: linear-gradient(145deg, var(--pink-light), var(--pink));
  box-shadow: var(--shadow-neu-in);
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.aside-tip p {
  margin: 0;
}

/* ===== Content Body ===== */
.content-body {
  flex: 1;
  padding: 40px 40px 40px 20px;
  min-width: 0;
}

.section-deco-figure {
  margin-bottom: 24px;
}

.section-deco-bar {
  width: 60px;
  height: 4px;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--pink), var(--blue-dark));
  box-shadow: 0 2px 8px rgba(200,160,180,0.3);
}

/* ===== page.content 内部样式 ===== */
.page-content-wrap {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.page-content-wrap article {
  padding: 48px 0;
  border-bottom: 1px solid rgba(155,190,221,0.25);
  scroll-margin-top: 24px;
}

.page-content-wrap article:last-child {
  border-bottom: none;
}

.page-content-wrap small {
  display: block;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-light);
  margin-bottom: 6px;
}

.page-content-wrap h2 {
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 18px;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.page-content-wrap h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 12px;
  line-height: 1.4;
}

.page-content-wrap p {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.75;
  margin-bottom: 16px;
  max-width: 72ch;
}

.page-content-wrap ul,
.page-content-wrap ol {
  padding-left: 1.4em;
  margin-bottom: 16px;
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.75;
}

.page-content-wrap li {
  margin-bottom: 6px;
}

.page-content-wrap a {
  color: var(--dark);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--transition);
}

.page-content-wrap a:hover {
  color: var(--text-muted);
}

.page-content-wrap table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 20px;
  font-size: 0.92rem;
}

.page-content-wrap th,
.page-content-wrap td {
  padding: 10px 14px;
  border: 1px solid rgba(155,190,221,0.3);
  text-align: left;
  color: var(--text-muted);
}

.page-content-wrap th {
  background: linear-gradient(145deg, var(--blue-light), var(--blue));
  color: var(--dark);
  font-weight: 600;
}

.page-content-wrap img {
  max-width: 100%;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-neu-out);
}

.page-content-wrap figure {
  margin-bottom: 20px;
}

.page-content-wrap aside {
  padding: 18px 20px;
  border-radius: var(--radius);
  background: linear-gradient(145deg, var(--pink-light), var(--pink));
  box-shadow: var(--shadow-neu-in);
  margin-bottom: 20px;
  font-size: 0.92rem;
  color: var(--text-muted);
}

/* Card-like blocks inside content */
.page-content-wrap .card,
.page-content-wrap [class*="card"] {
  background: linear-gradient(145deg, var(--blue-light), var(--blue));
  border-radius: var(--radius);
  box-shadow: var(--shadow-neu-out);
  padding: 20px 24px;
  margin-bottom: 16px;
  transition: box-shadow var(--transition), transform var(--transition);
}

.page-content-wrap .card:hover,
.page-content-wrap [class*="card"]:hover {
  box-shadow:
    -7px -7px 20px rgba(255,255,255,0.9),
    7px 7px 20px rgba(140,170,200,0.45);
  transform: translateY(-2px);
}

/* Grid helpers in content */
.page-content-wrap .grid,
.page-content-wrap [class*="grid"] {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}

/* ===== Footer ===== */
.site-footer {
  background: linear-gradient(160deg, var(--dark) 0%, var(--dark-mid) 100%);
  color: rgba(200,224,244,0.85);
  margin-top: auto;
}

.footer-cta-block {
  text-align: center;
  padding: 56px 24px 48px;
  border-bottom: 1px solid rgba(200,224,244,0.1);
}

.footer-eyebrow,
.footer-nav-eyebrow,
.footer-info-eyebrow {
  display: block;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--pink);
  margin-bottom: 10px;
}

.footer-cta-title {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 700;
  color: var(--blue-light);
  margin-bottom: 14px;
  line-height: 1.25;
}

.footer-cta-desc {
  font-size: 1rem;
  color: rgba(200,224,244,0.6);
  margin-bottom: 28px;
  line-height: 1.6;
}

.footer-cta-block .btn-primary {
  background: linear-gradient(145deg, var(--pink), var(--pink-dark));
  box-shadow:
    -4px -4px 12px rgba(60,40,50,0.5),
    4px 4px 12px rgba(0,0,0,0.5);
}

.footer-main {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 32px;
  padding: 40px 40px 32px;
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
}

.footer-logo-link {
  display: inline-block;
  margin-bottom: 14px;
  text-decoration: none;
}

.footer-logo-link .site-logo-img {
  opacity: 0.9;
}

.footer-logo-link .logo-text {
  color: var(--blue-light);
  font-size: 1.2rem;
}

.footer-desc {
  font-size: 0.88rem;
  line-height: 1.7;
  color: rgba(200,224,244,0.55);
}

.footer-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 8px;
}

.footer-nav-list li a {
  color: rgba(200,224,244,0.65);
  text-decoration: none;
  font-size: 0.88rem;
  padding: 5px 0;
  min-height: 40px;
  display: flex;
  align-items: center;
  transition: color var(--transition);
}

.footer-nav-list li a:hover {
  color: var(--blue-light);
}

.footer-info-text {
  font-size: 0.82rem;
  color: rgba(200,224,244,0.45);
  line-height: 1.65;
  margin-bottom: 10px;
}

.footer-bottom {
  text-align: center;
  padding: 18px 24px;
  border-top: 1px solid rgba(200,224,244,0.08);
  font-size: 0.8rem;
  color: rgba(200,224,244,0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
}

.footer-sep {
  opacity: 0.4;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: var(--blue);
}
::-webkit-scrollbar-thumb {
  background: var(--blue-dark);
  border-radius: 3px;
}

/* ===== Section scroll-margin for fixed nav ===== */
article[id] {
  scroll-margin-top: 24px;
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  :root {
    --nav-w: 0px;
  }

  .sidenav {
    width: 100%;
    height: auto;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    flex-direction: column;
    overflow: hidden;
    border-radius: 0 0 var(--radius) var(--radius);
    box-shadow: 0 4px 20px rgba(140,170,200,0.3);
  }

  .sidenav:not([open]) {
    height: auto;
  }

  .sidenav:not([open]) .sidenav-announce,
  .sidenav:not([open]) .sidenav-menu {
    display: none;
  }

  .sidenav-summary {
    padding: 14px 16px;
  }

  .nav-toggle-icon {
    display: flex;
  }

  .content-shift {
    margin-left: 0;
    padding-top: 70px;
  }

  .hero-aside {
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    margin-bottom: 24px;
    gap: 8px;
    align-items: center;
    top: auto;
    right: auto;
  }

  .hero-section {
    padding: 32px 16px;
    min-height: calc(100vh - 70px);
  }

  .hero-h1 {
    font-size: 2rem;
  }

  .content-main-section {
    flex-direction: column;
  }

  .content-aside {
    width: 100%;
    padding: 24px 16px 8px;
  }

  .aside-sticky {
    position: static;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: flex-start;
  }

  .aside-title {
    width: 100%;
    margin-bottom: 8px;
  }

  .aside-nav-list {
    flex-direction: row;
    flex-wrap: wrap;
    margin-bottom: 12px;
  }

  .aside-nav-list li a {
    padding: 6px 12px;
    white-space: nowrap;
  }

  .aside-tip {
    width: 100%;
  }

  .content-body {
    padding: 16px 16px 32px;
  }

  .footer-main {
    grid-template-columns: 1fr;
    padding: 32px 20px;
    gap: 24px;
  }

  .footer-cta-block {
    padding: 40px 20px;
  }
}

@media (max-width: 500px) {
  .hero-h1 {
    font-size: 1.7rem;
  }

  .hero-cta-row {
    flex-direction: column;
    align-items: center;
  }

  .btn-primary,
  .btn-ghost {
    width: 100%;
    max-width: 300px;
  }

  .page-content-wrap h2 {
    font-size: 1.3rem;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 4px;
  }

  .footer-sep {
    display: none;
  }
}