:root {
  --primary: #ff5c8a;
  --primary-dark: #e8436f;
  --primary-light: #ff8fb1;
  --secondary: #7c5cff;
  --secondary-light: #a78bfa;
  --accent: #ffb347;
  --bg: #fdf6f9;
  --bg-alt: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.72);
  --bg-glass: rgba(255, 255, 255, 0.55);
  --text: #2d2430;
  --text-secondary: #6b5d70;
  --text-muted: #9a8da0;
  --border: rgba(255, 92, 138, 0.12);
  --border-strong: rgba(255, 92, 138, 0.22);
  --shadow: 0 8px 32px rgba(255, 92, 138, 0.08);
  --shadow-hover: 0 16px 48px rgba(255, 92, 138, 0.16);
  --shadow-card: 0 4px 24px rgba(124, 92, 255, 0.06);
  --radius: 20px;
  --radius-sm: 14px;
  --radius-xs: 10px;
  --radius-pill: 999px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --transition: 0.35s cubic-bezier(0.22, 1, 0.36, 1);
  --transition-fast: 0.2s ease;
  --max-width: 1180px;
  --gradient-banner: linear-gradient(135deg, #ff5c8a 0%, #ff8fb1 30%, #a78bfa 70%, #7c5cff 100%);
  --gradient-soft: linear-gradient(135deg, rgba(255, 92, 138, 0.08) 0%, rgba(124, 92, 255, 0.08) 100%);
  --gradient-card: linear-gradient(135deg, rgba(255, 255, 255, 0.9) 0%, rgba(255, 245, 250, 0.85) 100%);
}

@media (prefers-color-scheme: dark) {
  :root {
    --primary: #ff7aa2;
    --primary-dark: #ff5c8a;
    --primary-light: #ffb3c9;
    --secondary: #a78bfa;
    --secondary-light: #c4b5fd;
    --accent: #ffc266;
    --bg: #14101a;
    --bg-alt: #1c1624;
    --bg-card: rgba(40, 32, 52, 0.72);
    --bg-glass: rgba(40, 32, 52, 0.55);
    --text: #f0eaf5;
    --text-secondary: #b8aac4;
    --text-muted: #7e6f8a;
    --border: rgba(255, 122, 162, 0.15);
    --border-strong: rgba(255, 122, 162, 0.28);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 16px 48px rgba(255, 122, 162, 0.18);
    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.25);
    --gradient-banner: linear-gradient(135deg, #d94a74 0%, #c76ba0 30%, #8b6fd4 70%, #6b4fd4 100%);
    --gradient-soft: linear-gradient(135deg, rgba(255, 122, 162, 0.1) 0%, rgba(167, 139, 250, 0.1) 100%);
    --gradient-card: linear-gradient(135deg, rgba(40, 32, 52, 0.9) 0%, rgba(32, 26, 44, 0.85) 100%);
  }
}

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  background-image:
    radial-gradient(ellipse 80% 50% at 0% 0%, rgba(255, 92, 138, 0.06) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 100% 20%, rgba(124, 92, 255, 0.06) 0%, transparent 60%),
    radial-gradient(ellipse 70% 50% at 50% 100%, rgba(255, 179, 71, 0.04) 0%, transparent 60%);
  background-attachment: fixed;
}

@media (prefers-color-scheme: dark) {
  body {
    background-image:
      radial-gradient(ellipse 80% 50% at 0% 0%, rgba(255, 122, 162, 0.08) 0%, transparent 60%),
      radial-gradient(ellipse 60% 40% at 100% 20%, rgba(167, 139, 250, 0.08) 0%, transparent 60%),
      radial-gradient(ellipse 70% 50% at 50% 100%, rgba(255, 194, 102, 0.05) 0%, transparent 60%);
  }
}

::selection {
  background: rgba(255, 92, 138, 0.25);
  color: var(--text);
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--primary-light), var(--secondary-light));
  border-radius: var(--radius-pill);
  border: 2px solid var(--bg);
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, var(--primary), var(--secondary));
}

/* ===== HEADER ===== */
header {
  position: relative;
  background: var(--gradient-banner);
  color: #fff;
  padding: 0;
  overflow: hidden;
  isolation: isolate;
}

header::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 15% 85%, rgba(255, 255, 255, 0.18) 0%, transparent 45%),
    radial-gradient(circle at 85% 15%, rgba(255, 255, 255, 0.14) 0%, transparent 45%),
    radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.06) 0%, transparent 70%);
  z-index: -1;
}

header::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 60px;
  background: var(--bg);
  border-radius: 50% 50% 0 0 / 100% 100% 0 0;
  z-index: 1;
}

header > h1,
header > p,
header > nav {
  position: relative;
  z-index: 2;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

header > h1 {
  font-size: clamp(1.5rem, 4vw, 2.6rem);
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -0.01em;
  padding-top: 72px;
  padding-bottom: 16px;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.12);
  animation: fadeSlideDown 0.8s cubic-bezier(0.22, 1, 0.36, 1) both;
}

header > p {
  font-size: clamp(0.9rem, 1.6vw, 1.05rem);
  line-height: 1.8;
  opacity: 0.92;
  max-width: 860px;
  padding-bottom: 28px;
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.08);
  animation: fadeSlideDown 0.8s 0.15s cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes fadeSlideDown {
  from {
    opacity: 0;
    transform: translateY(-24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== NAV ===== */
header > nav {
  padding-bottom: 72px;
  animation: fadeSlideDown 0.8s 0.3s cubic-bezier(0.22, 1, 0.36, 1) both;
}

header > nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

header > nav ul li a {
  display: inline-block;
  padding: 9px 20px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.28);
  color: #fff;
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition:
    background var(--transition),
    transform var(--transition),
    box-shadow var(--transition),
    border-color var(--transition);
  white-space: nowrap;
}

header > nav ul li a:hover,
header > nav ul li a:focus-visible {
  background: rgba(255, 255, 255, 0.32);
  border-color: rgba(255, 255, 255, 0.5);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  outline: none;
}

header > nav ul li a:active {
  transform: translateY(0);
}

/* ===== MAIN ===== */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px 80px;
}

/* ===== SECTION ===== */
main > section {
  position: relative;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px 36px;
  margin-bottom: 32px;
  box-shadow: var(--shadow-card);
  transition:
    box-shadow var(--transition),
    transform var(--transition),
    border-color var(--transition);
  animation: sectionReveal 0.7s cubic-bezier(0.22, 1, 0.36, 1) both;
  animation-timeline: view();
  animation-range: entry 0% entry 30%;
}

@supports not (animation-timeline: view()) {
  main > section {
    animation: sectionRevealFallback 0.7s cubic-bezier(0.22, 1, 0.36, 1) both;
  }
}

@keyframes sectionReveal {
  from {
    opacity: 0;
    transform: translateY(40px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes sectionRevealFallback {
  from {
    opacity: 0;
    transform: translateY(40px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

main > section:hover {
  box-shadow: var(--shadow-hover);
  border-color: var(--border-strong);
}

main > section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 36px;
  right: 36px;
  height: 3px;
  border-radius: 0 0 4px 4px;
  background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent));
  opacity: 0;
  transition: opacity var(--transition);
}

main > section:hover::before {
  opacity: 1;
}

/* ===== HEADINGS ===== */
main > section > h2 {
  font-size: clamp(1.3rem, 2.6vw, 1.75rem);
  font-weight: 800;
  color: var(--text);
  margin-bottom: 20px;
  padding-bottom: 14px;
  position: relative;
  letter-spacing: -0.01em;
  line-height: 1.4;
}

main > section > h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 64px;
  height: 4px;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  transition: width var(--transition);
}

main > section:hover > h2::after {
  width: 120px;
}

main > section > h3 {
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  font-weight: 700;
  color: var(--primary-dark);
  margin-top: 28px;
  margin-bottom: 12px;
  line-height: 1.5;
  letter-spacing: -0.005em;
}

@media (prefers-color-scheme: dark) {
  main > section > h3 {
    color: var(--primary-light);
  }
}

main > section > h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--secondary);
  margin-top: 22px;
  margin-bottom: 10px;
}

main > section > p {
  color: var(--text-secondary);
  margin-bottom: 14px;
  font-size: 0.95rem;
  line-height: 1.85;
  text-align: justify;
  hyphens: auto;
}

/* ===== ARTICLE ===== */
main > section > article {
  position: relative;
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 24px 26px;
  margin-bottom: 18px;
  transition:
    transform var(--transition),
    box-shadow var(--transition),
    border-color var(--transition);
  overflow: hidden;
}

main > section > article::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--primary), var(--secondary));
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
  opacity: 0;
  transition: opacity var(--transition);
}

main > section > article:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow);
  border-color: var(--border-strong);
}

main > section > article:hover::before {
  opacity: 1;
}

main > section > article h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  margin-top: 0;
  margin-bottom: 6px;
  line-height: 1.5;
}

main > section > article h3 + p {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  font-weight: 500;
}

main > section > article p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 10px;
}

main > section > article p:last-child {
  margin-bottom: 0;
}

main > section > article a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.88rem;
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  background: rgba(255, 92, 138, 0.08);
  border: 1px solid rgba(255, 92, 138, 0.15);
  transition:
    background var(--transition),
    color var(--transition),
    transform var(--transition),
    box-shadow var(--transition);
}

main > section > article a::after {
  content: "→";
  font-size: 0.9em;
  transition: transform var(--transition);
}

main > section > article a:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255, 92, 138, 0.3);
}

main > section > article a:hover::after {
  transform: translateX(3px);
}

@media (prefers-color-scheme: dark) {
  main > section > article a {
    background: rgba(255, 122, 162, 0.12);
    border-color: rgba(255, 122, 162, 0.2);
  }
}

/* ===== FAQ (DL) ===== */
main > section#faq dl {
  display: grid;
  gap: 14px;
}

main > section#faq dt {
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--text);
  padding: 14px 20px;
  background: var(--gradient-soft);
  border-radius: var(--radius-xs) var(--radius-xs) 0 0;
  border: 1px solid var(--border);
  border-bottom: none;
  position: relative;
  padding-left: 42px;
  transition: background var(--transition), border-color var(--transition);
}

main > section#faq dt::before {
  content: "Q";
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  border-radius: 50%;
  font-size: 0.7rem;
  font-weight: 800;
  line-height: 1;
}

main > section#faq dd {
  padding: 14px 20px 16px 42px;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-top: none;
  border-radius: 0 0 var(--radius-xs) var(--radius-xs);
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.85;
  margin-bottom: 6px;
  transition: background var(--transition), border-color var(--transition);
  position: relative;
}

main > section#faq dd::before {
  content: "A";
  position: absolute;
  left: 14px;
  top: 16px;
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(124, 92, 255, 0.12);
  color: var(--secondary);
  border-radius: 50%;
  font-size: 0.7rem;
  font-weight: 800;
  line-height: 1;
}

main > section#faq dt:hover {
  background: rgba(255, 92, 138, 0.1);
  border-color: var(--border-strong);
}

main > section#faq dt:hover + dd {
  border-color: var(--border-strong);
}

@media (prefers-color-scheme: dark) {
  main > section#faq dt::before {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
  }
  main > section#faq dd::before {
    background: rgba(167, 139, 250, 0.18);
  }
}

/* ===== CONTACT SECTION LISTS ===== */
main > section#contact ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 12px;
  margin-bottom: 8px;
}

main > section#contact ul li a {
  display: inline-block;
  padding: 8px 18px;
  border-radius: var(--radius-pill);
  background: var(--gradient-soft);
  border: 1px solid var(--border);
  color: var(--primary-dark);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  transition:
    background var(--transition),
    transform var(--transition),
    box-shadow var(--transition),
    color var(--transition),
    border-color var(--transition);
}

main > section#contact ul li a:hover {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(255, 92, 138, 0.25);
}

@media (prefers-color-scheme: dark) {
  main > section#contact ul li a {
    color: var(--primary-light);
  }
}

/* ===== FOOTER ===== */
footer {
  position: relative;
  background: var(--gradient-banner);
  color: rgba(255, 255, 255, 0.9);
  text-align: center;
  padding: 48px 24px 40px;
  margin-top: 20px;
  overflow: hidden;
}

footer::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  right: 0;
  height: 60px;
  background: var(--bg);
  border-radius: 0 0 50% 50% / 0 0 100% 100%;
  z-index: 1;
}

footer p {
  position: relative;
  z-index: 2;
  font-size: 0.88rem;
  line-height: 1.9;
  margin-bottom: 4px;
  opacity: 0.92;
}

footer p:first-child {
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 8px;
}

footer p:last-child {
  margin-bottom: 0;
  opacity: 0.75;
  font-size: 0.82rem;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  main {
    padding: 0 16px 60px;
  }

  main > section {
    padding: 30px 24px;
    border-radius: var(--radius-sm);
  }

  main > section::before {
    left: 24px;
    right: 24px;
  }

  header > h1 {
    padding-top: 56px;
  }

  header > nav {
    padding-bottom: 56px;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 15px;
  }

  header > h1,
  header > p,
  header > nav {
    padding-left: 18px;
    padding-right: 18px;
  }

  header > h1 {
    font-size: 1.35rem;
    padding-top: 48px;
    padding-bottom: 12px;
  }

  header > p {
    font-size: 0.88rem;
    padding-bottom: 20px;
  }

  header > nav {
    padding-bottom: 48px;
  }

  header > nav ul {
    gap: 8px;
  }

  header > nav ul li a {
    padding: 7px 14px;
    font-size: 0.8rem;
  }

  main {
    padding: 0 12px 48px;
  }

  main > section {
    padding: 24px 18px;
    margin-bottom: 20px;
    border-radius: var(--radius-xs);
  }

  main > section::before {
    left: 18px;
    right: 18px;
  }

  main > section > h2 {
    font-size: 1.2rem;
    margin-bottom: 16px;
    padding-bottom: 12px;
  }

  main > section > h2::after {
    width: 48px;
    height: 3px;
  }

  main > section > h3 {
    font-size: 1rem;
    margin-top: 22px;
  }

  main > section > p {
    font-size: 0.9rem;
    text-align: left;
  }

  main > section > article {
    padding: 18px 16px;
  }

  main > section > article h3 {
    font-size: 0.98rem;
  }

  main > section#faq dt {
    padding: 12px 16px 12px 38px;
    font-size: 0.92rem;
  }

  main > section#faq dt::before {
    left: 12px;
    width: 20px;
    height: 20px;
    font-size: 0.65rem;
  }

  main > section#faq dd {
    padding: 12px 16px 14px 38px;
    font-size: 0.88rem;
  }

  main > section#faq dd::before {
    left: 12px;
    top: 14px;
    width: 20px;
    height: 20px;
    font-size: 0.65rem;
  }

  main > section#contact ul {
    flex-direction: column;
  }

  main > section#contact ul li a {
    display: block;
    text-align: center;
  }

  footer {
    padding: 40px 18px 32px;
  }

  footer p {
    font-size: 0.82rem;
  }
}

@media (max-width: 380px) {
  header > h1 {
    font-size: 1.15rem;
  }

  header > nav ul li a {
    padding: 6px 12px;
    font-size: 0.75rem;
  }

  main > section {
    padding: 20px 14px;
  }
}

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

  main > section {
    animation: none;
    opacity: 1;
    transform: none;
  }
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ===== PRINT ===== */
@media print {
  header {
    background: #fff;
    color: #000;
  }

  header::after,
  footer::before {
    display: none;
  }

  main > section {
    box-shadow: none;
    border: 1px solid #ddd;
    break-inside: avoid;
  }

  main > section > article {
    break-inside: avoid;
  }

  footer {
    background: #fff;
    color: #000;
  }
}