:root {
  --primary: #e63946;
  --primary-dark: #c1121f;
  --primary-light: #ff6b6b;
  --accent: #ff9f1c;
  --accent-2: #ffbf69;
  --bg: #fff8f5;
  --bg-alt: #ffffff;
  --surface: rgba(255, 255, 255, 0.72);
  --surface-solid: #ffffff;
  --text: #2b2b2b;
  --text-soft: #5a5a5a;
  --text-muted: #8a8a8a;
  --border: rgba(230, 57, 70, 0.14);
  --border-soft: rgba(0, 0, 0, 0.08);
  --shadow-sm: 0 2px 8px rgba(230, 57, 70, 0.06);
  --shadow-md: 0 8px 24px rgba(230, 57, 70, 0.1);
  --shadow-lg: 0 18px 48px rgba(230, 57, 70, 0.16);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --grad-hero: linear-gradient(135deg, #ff6b6b 0%, #e63946 40%, #ff9f1c 100%);
  --grad-soft: linear-gradient(135deg, rgba(255, 107, 107, 0.12), rgba(255, 159, 28, 0.12));
  --grad-accent: linear-gradient(135deg, #e63946, #ff9f1c);
  --header-h: 72px;
  --transition: 0.3s cubic-bezier(0.22, 0.61, 0.36, 1);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

html[data-theme="dark"] {
  --primary: #ff6b6b;
  --primary-dark: #e63946;
  --primary-light: #ff8e8e;
  --accent: #ffb347;
  --accent-2: #ffd166;
  --bg: #14141c;
  --bg-alt: #1b1b26;
  --surface: rgba(30, 30, 44, 0.72);
  --surface-solid: #1e1e2c;
  --text: #f0f0f5;
  --text-soft: #c4c4d0;
  --text-muted: #8f8fa3;
  --border: rgba(255, 107, 107, 0.22);
  --border-soft: rgba(255, 255, 255, 0.08);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.5);
  --grad-hero: linear-gradient(135deg, #7a1f2b 0%, #4a1420 45%, #6b3a10 100%);
  --grad-soft: linear-gradient(135deg, rgba(255, 107, 107, 0.1), rgba(255, 179, 71, 0.1));
  --grad-accent: linear-gradient(135deg, #ff6b6b, #ffb347);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background-color: var(--bg);
  background-image: radial-gradient(
      circle at 12% 8%,
      rgba(255, 107, 107, 0.1),
      transparent 42%
    ),
    radial-gradient(circle at 88% 4%, rgba(255, 159, 28, 0.1), transparent 40%),
    radial-gradient(circle at 50% 100%, rgba(230, 57, 70, 0.06), transparent 55%);
  background-attachment: fixed;
  transition: background-color var(--transition), color var(--transition);
  overflow-x: hidden;
}

img,
svg {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition), opacity var(--transition);
}

a:hover,
a:focus-visible {
  color: var(--primary-dark);
}

p {
  margin: 0 0 1em;
}

ul,
ol {
  margin: 0 0 1.2em;
  padding-left: 1.4em;
}

li {
  margin-bottom: 0.5em;
}

h1,
h2,
h3,
h4 {
  margin: 0 0 0.6em;
  line-height: 1.35;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

h1 {
  font-size: clamp(1.6rem, 4.2vw, 2.6rem);
}

h2 {
  font-size: clamp(1.35rem, 3.2vw, 2rem);
}

h3 {
  font-size: clamp(1.1rem, 2.4vw, 1.35rem);
}

time {
  font-variant-numeric: tabular-nums;
}

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ============ HEADER ============ */
#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--surface);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid var(--border-soft);
  transition: background var(--transition), box-shadow var(--transition);
}

#site-header.scrolled {
  box-shadow: var(--shadow-md);
}

.header-inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 20px;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--text);
  flex-shrink: 0;
}

.logo svg {
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition);
}

.logo:hover svg {
  transform: rotate(-6deg) scale(1.06);
}

.logo-text {
  background: var(--grad-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  letter-spacing: 0.02em;
}

.main-nav {
  flex: 1 1 auto;
}

.main-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.main-nav li {
  margin: 0;
}

.main-nav a {
  display: inline-block;
  padding: 8px 12px;
  font-size: 0.9rem;
  color: var(--text-soft);
  border-radius: 999px;
  transition: background var(--transition), color var(--transition),
    transform var(--transition);
}

.main-nav a:hover,
.main-nav a:focus-visible {
  color: var(--primary);
  background: var(--grad-soft);
  transform: translateY(-2px);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.site-search {
  display: flex;
  align-items: center;
  background: var(--surface-solid);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px 3px 3px 14px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), border-color var(--transition);
}

.site-search:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(230, 57, 70, 0.14);
}

.site-search input {
  border: 0;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 0.88rem;
  width: 180px;
  padding: 6px 4px;
  outline: none;
}

.site-search input::placeholder {
  color: var(--text-muted);
}

.site-search button {
  border: 0;
  cursor: pointer;
  font: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  color: #fff;
  background: var(--grad-accent);
  padding: 7px 16px;
  border-radius: 999px;
  transition: transform var(--transition), filter var(--transition);
}

.site-search button:hover {
  transform: scale(1.05);
  filter: brightness(1.06);
}

#theme-toggle,
#menu-toggle {
  border: 1px solid var(--border);
  background: var(--surface-solid);
  color: var(--text-soft);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

#theme-toggle:hover,
#menu-toggle:hover {
  color: var(--primary);
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

#menu-toggle {
  display: none;
}

/* ============ HERO ============ */
.hero {
  position: relative;
  max-width: 1240px;
  margin: 28px auto 0;
  padding: 0 20px;
}

.hero-slider {
  position: relative;
  border-radius: var(--radius-xl);
  padding: clamp(28px, 5vw, 56px);
  background: var(--grad-hero);
  color: #fff;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  isolation: isolate;
}

.hero-slider::before,
.hero-slider::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  z-index: -1;
  pointer-events: none;
}

.hero-slider::before {
  width: 420px;
  height: 420px;
  top: -160px;
  right: -120px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.28), transparent 68%);
  animation: float 12s ease-in-out infinite;
}

.hero-slider::after {
  width: 300px;
  height: 300px;
  bottom: -140px;
  left: -80px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.18), transparent 70%);
  animation: float 16s ease-in-out infinite reverse;
}

@keyframes float {
  0%,
  100% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(-24px, 20px) scale(1.08);
  }
}

.hero-slider .slide {
  display: none;
  animation: slideIn 0.6s ease both;
}

.hero-slider .slide.active {
  display: block;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-slider h1,
.hero-slider h2 {
  color: #fff;
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.18);
  max-width: 900px;
}

.hero-slider h1 {
  font-size: clamp(1.55rem, 4vw, 2.5rem);
  line-height: 1.3;
}

.hero-lead {
  max-width: 860px;
  font-size: clamp(0.95rem, 1.6vw, 1.05rem);
  color: rgba(255, 255, 255, 0.94);
  margin-bottom: 1em;
}

.hero-answer {
  max-width: 860px;
  font-size: 0.95rem;
  padding: 16px 20px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.28);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  color: rgba(255, 255, 255, 0.97);
}

.hero-answer strong {
  color: #fff;
}

.hero-slider .slide p:not(.hero-lead):not(.hero-answer) {
  color: rgba(255, 255, 255, 0.92);
  max-width: 820px;
}

.cta {
  display: inline-block;
  margin-top: 8px;
  padding: 13px 30px;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--primary-dark);
  background: #fff;
  border-radius: 999px;
  box-shadow: 0 8px 22px rgba(0, 0, 0, 0.18);
  transition: transform var(--transition), box-shadow var(--transition);
}

.cta:hover,
.cta:focus-visible {
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.26);
  color: var(--primary-dark);
}

.slider-controls {
  display: flex;
  gap: 10px;
  margin-top: 26px;
}

.slider-controls button {
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  background: rgba(255, 255, 255, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.4);
  padding: 9px 20px;
  border-radius: 999px;
  cursor: pointer;
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  transition: all var(--transition);
}

.slider-controls button:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: -34px;
  padding: 0 18px;
  position: relative;
  z-index: 2;
}

.stat {
  background: var(--surface);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px 14px;
  text-align: center;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition), box-shadow var(--transition);
}

.stat:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.stat-num {
  display: block;
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 800;
  background: var(--grad-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  font-variant-numeric: tabular-nums;
}

.stat-label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ============ BREADCRUMB ============ */
.breadcrumb {
  max-width: 1240px;
  margin: 24px auto 0;
  padding: 0 20px;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.breadcrumb li + li::before {
  content: "›";
  margin-right: 8px;
  color: var(--text-muted);
}

/* ============ SECTIONS ============ */
.section {
  max-width: 1240px;
  margin: 0 auto;
  padding: clamp(36px, 6vw, 64px) 20px;
  scroll-margin-top: calc(var(--header-h) + 12px);
}

.section > h2 {
  position: relative;
  padding-left: 18px;
  margin-bottom: 1.2em;
}

.section > h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 6px;
  border-radius: 999px;
  background: var(--grad-accent);
}

.section h3 {
  margin-top: 1.6em;
  color: var(--text);
}

.section p {
  color: var(--text-soft);
}

.section > p {
  max-width: 900px;
}

/* Reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.22, 0.61, 0.36, 1);
  will-change: opacity, transform;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .hero-slider::before,
  .hero-slider::after {
    animation: none;
  }
  * {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}

/* ============ TIMELINE ============ */
.timeline {
  list-style: none;
  padding: 0;
  margin: 1.4em 0;
  position: relative;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(
    to bottom,
    var(--primary),
    var(--accent),
    transparent
  );
  border-radius: 2px;
}

.timeline li {
  position: relative;
  padding: 4px 0 16px 34px;
  color: var(--text-soft);
}

.timeline li::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 10px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--surface-solid);
  border: 3px solid var(--primary);
  box-shadow: 0 0 0 4px rgba(230, 57, 70, 0.12);
  transition: transform var(--transition), box-shadow var(--transition);
}

.timeline li:hover::before {
  transform: scale(1.2);
  box-shadow: 0 0 0 6px rgba(230, 57, 70, 0.18);
}

.timeline strong {
  color: var(--text);
}

/* ============ PRODUCTS / CARDS ============ */
#products ul,
#howto ul,
#howto ol {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
}

#products ul li,
#howto ul li,
#howto ol li {
  position: relative;
  margin: 0;
  padding: 16px 18px 16px 46px;
  background: var(--surface);
  -webkit-backdrop-filter: blur(14px) saturate(150%);
  backdrop-filter: blur(14px) saturate(150%);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-soft);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition);
}

#products ul li::before,
#howto ul li::before {
  content: "✓";
  position: absolute;
  left: 16px;
  top: 16px;
  width: 20px;
  height: 20px;
  display: grid;
  place-items: center;
  font-size: 0.72rem;
  font-weight: 800;
  color: #fff;
  background: var(--grad-accent);
  border-radius: 50%;
}

#howto ol {
  counter-reset: step;
}

#howto ol li {
  padding-left: 54px;
  counter-increment: step;
}

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 16px;
  top: 16px;
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  font-size: 0.78rem;
  font-weight: 800;
  color: #fff;
  background: var(--grad-accent);
  border-radius: 8px;
}

#products ul li:hover,
#howto ul li:hover,
#howto ol li:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

#products ul li strong,
#howto ul li strong {
  color: var(--text);
}

/* ============ NEWS ============ */
.news-list {
  list-style: none;
  padding: 0;
  margin: 1.4em 0 0;
  display: grid;
  gap: 12px;
}

.news-list li {
  margin: 0;
  padding: 16px 20px;
  background: var(--surface);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-md);
  color: var(--text-soft);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition),
    border-left-color var(--transition);
}

.news-list li:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
  border-left-color: var(--accent);
}

.news-list time {
  display: inline-block;
  margin-right: 10px;
  padding: 2px 10px;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--primary);
  background: var(--grad-soft);
  border-radius: 999px;
}

/* ============ ARTICLE CARDS ============ */
#articles {
  display: block;
}

#articles .article-card {
  margin: 0 0 18px;
  padding: clamp(18px, 3vw, 26px);
  background: var(--surface);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition);
}

#articles .article-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}

#articles .article-card h3 {
  margin-top: 0;
  font-size: clamp(1.05rem, 2.2vw, 1.25rem);
}

#articles .article-card h3::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 10px;
  vertical-align: middle;
  border-radius: 50%;
  background: var(--grad-accent);
}

#articles .meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.8em;
}

#articles .article-card > a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 700;
  padding: 8px 18px;
  border-radius: 999px;
  background: var(--grad-soft);
  color: var(--primary);
  transition: all var(--transition);
}

#articles .article-card > a::after {
  content: "→";
  transition: transform var(--transition);
}

#articles .article-card > a:hover {
  background: var(--grad-accent);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

#articles .article-card > a:hover::after {
  transform: translateX(4px);
}

@media (min-width: 900px) {
  #articles {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
    align-items: start;
  }
  #articles > h2,
  #articles > p {
    grid-column: 1 / -1;
  }
  #articles .article-card {
    margin: 0;
  }
}

/* ============ FAQ ============ */
#faq details {
  margin-bottom: 12px;
  background: var(--surface);
  -webkit-backdrop-filter: blur(14px) saturate(150%);
  backdrop-filter: blur(14px) saturate(150%);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow var(--transition), border-color var(--transition);
}

#faq details[open] {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

#faq summary {
  cursor: pointer;
  list-style: none;
  padding: 16px 52px 16px 20px;
  font-weight: 600;
  color: var(--text);
  position: relative;
  transition: background var(--transition), color var(--transition);
}

#faq summary::-webkit-details-marker {
  display: none;
}

#faq summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  background: var(--grad-accent);
  border-radius: 50%;
  transition: transform var(--transition);
}

#faq details[open] summary::after {
  transform: translateY(-50%) rotate(45deg);
}

#faq summary:hover {
  background: var(--grad-soft);
  color: var(--primary);
}

#faq details p {
  margin: 0;
  padding: 0 20px 18px;
  color: var(--text-soft);
  font-size: 0.94rem;
  animation: fadeDown 0.35s ease both;
}

@keyframes fadeDown {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============ CASES / BLOCKQUOTE ============ */
blockquote {
  margin: 1.4em 0;
  padding: 20px 24px;
  background: var(--grad-soft);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-md);
  color: var(--text-soft);
  font-style: normal;
}

blockquote p {
  margin: 0 0 0.6em;
  color: var(--text-soft);
}

blockquote p:last-child {
  margin-bottom: 0;
}

/* ============ CONTACT ============ */
#contact address {
  font-style: normal;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 12px;
  margin: 1.2em 0;
}

#contact address p {
  margin: 0;
  padding: 16px 20px;
  background: var(--surface);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  color: var(--text-soft);
  transition: transform var(--transition), box-shadow var(--transition);
}

#contact address p:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

#contact address strong {
  color: var(--text);
}

/* ============ SITEMAP & LINKS ============ */
.sitemap-list,
.friend-links {
  list-style: none;
  padding: 0;
  margin: 1.2em 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.sitemap-list li,
.friend-links li {
  margin: 0;
}

.sitemap-list a,
.friend-links a {
  display: inline-block;
  padding: 9px 18px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-soft);
  background: var(--surface-solid);
  border: 1px solid var(--border);
  border-radius: 999px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}

.sitemap-list a:hover,
.friend-links a:hover {
  color: #fff;
  background: var(--grad-accent);
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

/* ============ FOOTER ============ */
#site-footer {
  margin-top: 40px;
  padding: 44px 20px 32px;
  background: var(--surface);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  backdrop-filter: blur(18px) saturate(160%);
  border-top: 1px solid var(--border-soft);
}

.footer-inner {
  max-width: 1240px;
  margin: 0 auto;
  display: grid;
  gap: 18px;
  text-align: center;
}

.footer-brand p {
  margin: 0 0 6px;
  color: var(--text-soft);
  font-size: 0.92rem;
}

.footer-brand strong {
  font-size: 1.05rem;
  background: var(--grad-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 22px;
}

.footer-links a {
  font-size: 0.88rem;
  color: var(--text-soft);
  position: relative;
}

.footer-links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -3px;
  height: 2px;
  border-radius: 2px;
  background: var(--grad-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.footer-links a:hover::after {
  transform: scaleX(1);
}

.footer-copy {
  margin: 0;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ============ BACK TO TOP ============ */
#back-to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 90;
  width: 52px;
  height: 52px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  cursor: pointer;
  font-size: 0.72rem;
  font-weight: 700;
  line-height: 1.1;
  color: #fff;
  background: var(--grad-accent);
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px) scale(0.9);
  transition: opacity var(--transition), transform var(--transition),
    visibility var(--transition), box-shadow var(--transition);
}

#back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

#back-to-top:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px) scale(1.06);
}

/* ============ RESPONSIVE ============ */
@media (max-width: 1024px) {
  .header-inner {
    gap: 12px;
  }
  .site-search input {
    width: 140px;
  }
  .main-nav a {
    padding: 8px 10px;
    font-size: 0.86rem;
  }
}

@media (max-width: 860px) {
  :root {
    --header-h: 64px;
  }

  #menu-toggle {
    display: inline-block;
  }

  .main-nav {
    order: 3;
    flex-basis: 100%;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.4s ease, opacity 0.3s ease,
      padding 0.3s ease;
  }

  .main-nav.open {
    max-height: 640px;
    opacity: 1;
    padding: 8px 0 14px;
  }

  .main-nav ul {
    flex-direction: column;
    gap: 4px;
  }

  .main-nav a {
    display: block;
    padding: 11px 16px;
    font-size: 0.92rem;
    background: var(--grad-soft);
    border-radius: var(--radius-sm);
  }

  .header-actions {
    margin-left: auto;
  }

  .site-search {
    display: none;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    margin-top: 20px;
    padding: 0;
  }

  .stat {
    padding: 16px 10px;
  }

  .hero-slider {
    border-radius: var(--radius-lg);
  }

  .slider-controls button {
    padding: 8px 16px;
    font-size: 0.8rem;
  }
}

@media (max-width: 560px) {
  body {
    font-size: 15px;
  }

  .header-inner {
    padding: 0 14px;
  }

  .logo {
    font-size: 1rem;
  }

  .logo svg {
    width: 34px;
    height: 34px;
  }

  #theme-toggle,
  #menu-toggle {
    padding: 7px 11px;
    font-size: 0.76rem;
  }

  .hero {
    margin-top: 16px;
    padding: 0 14px;
  }

  .section {
    padding-left: 14px;
    padding-right: 14px;
  }

  .breadcrumb {
    padding: 0 14px;
  }

  .hero-answer {
    padding: 14px 16px;
    font-size: 0.9rem;
  }

  .cta {
    display: block;
    text-align: center;
    padding: 13px 20px;
  }

  .slider-controls {
    gap: 8px;
  }

  #products ul,
  #howto ul,
  #howto ol {
    grid-template-columns: 1fr;
  }

  #contact address {
    grid-template-columns: 1fr;
  }

  #back-to-top {
    right: 14px;
    bottom: 14px;
    width: 46px;
    height: 46px;
    font-size: 0.66rem;
  }

  .footer-inner {
    gap: 14px;
  }
}

/* ============ PRINT ============ */
@media print {
  #site-header,
  #back-to-top,
  .slider-controls,
  .hero-stats,
  .site-search {
    display: none !important;
  }

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

  .hero-slider {
    background: #f4f4f4;
    color: #000;
    box-shadow: none;
  }

  .hero-slider h1,
  .hero-slider h2,
  .hero-slider p,
  .hero-answer {
    color: #000;
    text-shadow: none;
  }

  .section {
    padding: 18px 0;
    page-break-inside: avoid;
  }

  a {
    color: #000;
    text-decoration: underline;
  }
}