/* ============ Unidarts — style ============ */

:root {
  --bg: #0a0c12;
  --bg-2: #0e1119;
  --card: #141824;
  --card-2: #1a2030;
  --line: #232a3b;
  --text: #e9edf5;
  --muted: #99a3b8;
  --accent: #e63329;
  --accent-hover: #ff4b3e;
  --amber: #ffb400;
  --green: #3ecf8e;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 20px 50px rgba(0, 0, 0, .45);
  --font-head: 'Rajdhani', 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  --font-body: 'Inter', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans TC', system-ui, sans-serif;
  --nav-h: 68px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }

/* ============ Typography ============ */
h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: .2px;
}

.kicker {
  font-family: var(--font-head);
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--accent);
}

/* ============ Buttons ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: .95rem;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform .15s ease, background .2s ease, color .2s ease, border-color .2s ease, box-shadow .2s ease;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn-lg { padding: 15px 30px; font-size: 1.05rem; }
.btn-sm { padding: 9px 16px; font-size: .85rem; }

.btn-accent {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 10px 24px rgba(230, 51, 41, .32);
}
.btn-accent:hover { background: var(--accent-hover); transform: translateY(-2px); box-shadow: 0 14px 30px rgba(230, 51, 41, .42); }

.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--line);
}
.btn-ghost:hover { border-color: var(--accent); color: #fff; background: rgba(230, 51, 41, .08); }

.link {
  color: var(--muted);
  font-weight: 600;
  font-size: .9rem;
  transition: color .2s ease;
}
.link:hover { color: var(--accent); }

/* ============ NAV ============ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 0 clamp(16px, 4vw, 48px);
  background: rgba(10, 12, 18, .72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, .05);
}

.brand {
  font-family: var(--font-head);
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: .06em;
  color: #fff;
}
.brand span { color: var(--accent); }

.nav-links { display: flex; gap: 4px; }
.nav-links a {
  position: relative;
  padding: 8px 14px;
  font-size: .95rem;
  font-weight: 500;
  color: var(--muted);
  border-radius: 8px;
  transition: color .2s ease, background .2s ease;
}
.nav-links a:hover { color: #fff; }
.nav-links a.active { color: #fff; }
.nav-links a.active::after {
  content: '';
  position: absolute;
  left: 14px; right: 14px; bottom: 2px;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
}

.nav-actions { display: flex; align-items: center; gap: 12px; }

/* Language dropdown */
.lang { position: relative; }
.lang-current {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 999px;
  cursor: pointer;
  font-size: .88rem;
  font-weight: 600;
  transition: border-color .2s ease;
}
.lang-current:hover { border-color: var(--accent); }
.lang-current .chev { transition: transform .2s ease; }
.lang.open .lang-current .chev { transform: rotate(180deg); }

.lang-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 180px;
  padding: 6px;
  background: var(--card-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity .18s ease, transform .18s ease, visibility .18s;
}
.lang.open .lang-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.lang-menu li {
  padding: 9px 12px;
  border-radius: 8px;
  cursor: pointer;
  font-size: .92rem;
  color: var(--muted);
  transition: background .15s ease, color .15s ease;
}
.lang-menu li:hover { background: var(--card); color: #fff; }
.lang-menu li.active { background: rgba(230, 51, 41, .14); color: #fff; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav-toggle span {
  width: 24px; height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform .25s ease, opacity .25s ease;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============ HERO ============ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: calc(var(--nav-h) + 40px) 20px 80px;
  overflow: hidden;
  background:
    radial-gradient(1200px 600px at 50% -10%, rgba(230, 51, 41, .14), transparent 60%),
    radial-gradient(800px 400px at 85% 20%, rgba(255, 180, 0, .06), transparent 60%),
    var(--bg);
}

.hero-ring {
  position: absolute;
  top: 50%; left: 50%;
  width: 640px; height: 640px;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, .06);
  pointer-events: none;
}
.hero-ring::before,
.hero-ring::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  left: 50%; top: 50%;
  transform: translate(-50%, -50%);
}
.hero-ring::before {
  width: 420px; height: 420px;
  border: 1px solid rgba(230, 51, 41, .16);
}
.hero-ring::after {
  width: 200px; height: 200px;
  background: rgba(230, 51, 41, .05);
  border: 1px solid rgba(230, 51, 41, .28);
}

.hero h1 {
  position: relative;
  max-width: 900px;
  font-size: clamp(2.4rem, 6vw, 4.6rem);
  margin: 14px 0 22px;
  background: linear-gradient(180deg, #ffffff 30%, #f3b7b2 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-sub {
  position: relative;
  max-width: 640px;
  color: var(--muted);
  font-size: 1.1rem;
}

.hero-cta { position: relative; display: flex; gap: 14px; margin-top: 34px; flex-wrap: wrap; justify-content: center; }

.hero-badges {
  position: relative;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 40px;
}
.hero-badges li {
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, .03);
  font-size: .85rem;
  font-weight: 600;
  color: var(--muted);
}

/* ============ SECTIONS ============ */
.section {
  padding: 96px clamp(16px, 5vw, 64px);
  max-width: 1200px;
  margin: 0 auto;
}
.section-head { text-align: center; margin-bottom: 52px; }
.section-head h2 {
  font-size: clamp(1.9rem, 4vw, 2.7rem);
  margin: 10px 0 12px;
}
.section-head > p:not(.kicker) { color: var(--muted); max-width: 640px; margin: 0 auto; }

/* ============ CARDS ============ */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}
.card {
  display: flex;
  flex-direction: column;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease;
}
.card:hover { transform: translateY(-6px); border-color: rgba(230, 51, 41, .4); box-shadow: var(--shadow); }

.card-media { position: relative; aspect-ratio: 3 / 2; overflow: hidden; background: var(--bg-2); }
.card-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
.card:hover .card-media img { transform: scale(1.05); }
.badge-stock {
  position: absolute;
  top: 12px; left: 12px;
  padding: 4px 11px;
  border-radius: 999px;
  background: rgba(10, 14, 10, .7);
  border: 1px solid rgba(62, 207, 142, .5);
  color: var(--green);
  font-size: .75rem;
  font-weight: 700;
  backdrop-filter: blur(4px);
}

.card-body { display: flex; flex-direction: column; flex: 1; padding: 24px; }
.card-type {
  font-family: var(--font-head);
  font-size: .82rem;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent);
}
.card-body h3 { font-size: 1.6rem; margin: 8px 0 10px; }
.card-body p { color: var(--muted); font-size: .95rem; flex: 1; }

.tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 16px 0 22px; }
.tags li {
  padding: 5px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, .05);
  border: 1px solid var(--line);
  font-size: .78rem;
  font-weight: 600;
  color: var(--muted);
}

.card-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}
.price { font-family: var(--font-head); font-size: 1.5rem; font-weight: 700; color: #fff; }
.price em { display: block; font-style: normal; font-family: var(--font-body); font-size: .72rem; font-weight: 500; color: var(--green); }
.card-foot-actions { display: flex; align-items: center; gap: 14px; }

/* ============ PRODUCT DETAIL ============ */
.product { padding-top: 40px; }
.product-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.gallery-main {
  aspect-ratio: 3 / 2;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-2);
  border: 1px solid var(--line);
}
.gallery-main img { width: 100%; height: 100%; object-fit: contain; background: #fff; }

.gallery-thumbs { display: flex; gap: 12px; margin-top: 12px; }
.thumb {
  width: 92px; height: 68px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 2px solid transparent;
  cursor: pointer;
  padding: 0;
  background: var(--bg-2);
  transition: border-color .2s ease;
}
.thumb img { width: 100%; height: 100%; object-fit: cover; }
.thumb.active { border-color: var(--accent); }

.product-info h3 { font-size: 2.2rem; }
.product-type {
  font-family: var(--font-head);
  color: var(--accent);
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  font-size: .9rem;
  margin: 6px 0 16px;
}
.product-desc { color: var(--muted); margin-bottom: 18px; }
.product-info h4 {
  font-size: 1.1rem;
  margin: 26px 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

.features li {
  position: relative;
  padding: 7px 0 7px 30px;
  color: var(--text);
  font-size: .95rem;
}
.features li::before {
  content: '✓';
  position: absolute;
  left: 0; top: 6px;
  width: 20px; height: 20px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: rgba(62, 207, 142, .14);
  color: var(--green);
  font-size: .75rem;
  font-weight: 700;
}

.note {
  margin-top: 16px;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  background: rgba(255, 180, 0, .08);
  border: 1px solid rgba(255, 180, 0, .28);
  color: #ffd98a;
  font-size: .9rem;
}

.specs { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.specs div {
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background: var(--card);
  border: 1px solid var(--line);
}
.specs dt { font-size: .78rem; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; }
.specs dd { font-weight: 600; font-size: .95rem; }

.product-actions { display: flex; gap: 12px; margin-top: 26px; flex-wrap: wrap; }

.product-video { margin-top: 40px; }
.product-video h4 { margin-bottom: 14px; font-size: 1.1rem; }
.product-video .video { max-width: 560px; }

/* ============ NOTES / HOW TO ============ */
.notes {
  max-width: 720px;
  margin: 0 auto 48px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.notes li {
  position: relative;
  padding: 14px 18px 14px 46px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--muted);
}
.notes li::before {
  content: 'ℹ';
  position: absolute;
  left: 16px; top: 50%;
  transform: translateY(-50%);
  color: var(--accent);
  font-weight: 700;
}

.how-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.how-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  display: flex;
  flex-direction: column;
}
.how-card h3 { font-size: 1.4rem; margin-bottom: 16px; }
.how-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }

.steps { counter-reset: step; display: flex; flex-direction: column; gap: 0; flex: 1; }
.steps li {
  position: relative;
  padding: 12px 0 12px 40px;
  border-bottom: 1px solid var(--line);
  counter-increment: step;
  font-size: .93rem;
  color: var(--muted);
}
.steps li:last-child { border-bottom: none; }
.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0; top: 12px;
  width: 26px; height: 26px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: rgba(230, 51, 41, .14);
  color: var(--accent);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: .85rem;
}

/* ============ VIDEOS ============ */
.video-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.video { position: relative; cursor: pointer; }
.video-play {
  position: relative;
  display: block;
  width: 100%;
  border: none;
  padding: 0;
  cursor: pointer;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--bg-2);
}
.video-play img { width: 100%; height: 100%; object-fit: cover; opacity: .92; transition: transform .3s ease, opacity .3s ease; }
.video:hover .video-play img { transform: scale(1.05); opacity: 1; }
.video .play {
  position: absolute;
  top: 50%; left: 50%;
  width: 58px; height: 58px;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: rgba(230, 51, 41, .9);
  transition: transform .2s ease, background .2s ease;
}
.video .play::after {
  content: '';
  position: absolute;
  top: 50%; left: 54%;
  transform: translate(-50%, -50%);
  border-left: 16px solid #fff;
  border-top: 10px solid transparent;
  border-bottom: 10px solid transparent;
}
.video:hover .play { transform: translate(-50%, -50%) scale(1.1); background: var(--accent); }
.video figcaption { margin-top: 10px; font-size: .92rem; font-weight: 600; color: var(--text); }
.video.playing { aspect-ratio: 16 / 9; }
.video iframe { width: 100%; height: 100%; border-radius: var(--radius-sm); aspect-ratio: 16 / 9; }

.fw-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  align-items: center;
  margin-bottom: 48px;
}
.fw-grid .notes { margin: 0; }

/* ============ COMPATIBILITY TABLE ============ */
.legend { display: flex; gap: 24px; flex-wrap: wrap; justify-content: center; margin-bottom: 26px; }
.legend-item { display: inline-flex; align-items: center; gap: 8px; color: var(--muted); font-size: .88rem; }
.dot { display: grid; place-items: center; width: 20px; height: 20px; border-radius: 5px; font-size: .8rem; font-weight: 700; }
.dot.yes { background: rgba(62, 207, 142, .16); color: var(--green); }
.dot.na { background: rgba(255, 255, 255, .06); color: var(--muted); }

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
}
table.compat { border-collapse: separate; border-spacing: 0; width: 100%; min-width: 820px; }
.compat th, .compat td {
  padding: 11px 14px;
  text-align: center;
  font-size: .9rem;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
.compat thead th {
  position: sticky;
  top: 0;
  background: var(--card-2);
  font-family: var(--font-head);
  font-size: .8rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
  z-index: 1;
}
.compat thead th:first-child {
  left: 0;
  z-index: 3;
  box-shadow: 1px 0 0 var(--line);
}
.compat tbody th {
  text-align: left;
  font-weight: 600;
  color: var(--text);
  position: sticky;
  left: 0;
  z-index: 2;
  background: var(--card);
  box-shadow: 1px 0 0 var(--line);
}
.compat tbody tr:hover th, .compat tbody tr:hover td { background: var(--card-2); }
.compat td.yes { color: var(--green); font-weight: 700; }
.compat td.na { color: #55607a; }
.compat sup { color: var(--accent); font-weight: 700; }

.footnotes {
  max-width: 760px;
  margin: 26px auto 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  color: var(--muted);
  font-size: .86rem;
}
.footnotes sup { color: var(--accent); font-weight: 700; margin-right: 4px; }

/* ============ CHANGELOG ============ */
.changelog {
  max-width: 760px;
  margin: 0 auto;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.changelog summary {
  cursor: pointer;
  padding: 18px 24px;
  font-weight: 700;
  font-family: var(--font-head);
  font-size: 1.05rem;
  letter-spacing: .04em;
  color: var(--text);
  user-select: none;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.changelog summary::-webkit-details-marker { display: none; }
.changelog summary::after { content: '+'; font-size: 1.3rem; color: var(--accent); transition: transform .2s ease; }
.changelog[open] summary::after { transform: rotate(45deg); }
.changelog ul { padding: 0 24px 20px; display: flex; flex-direction: column; gap: 10px; }
.changelog li {
  position: relative;
  padding-left: 20px;
  color: var(--muted);
  font-size: .9rem;
}
.changelog li::before { content: '•'; position: absolute; left: 2px; color: var(--accent); }
.changelog li strong {
  color: var(--amber);
  font-weight: 700;
  font-family: var(--font-head);
  letter-spacing: .02em;
  margin-right: 6px;
}

/* ============ BUY ============ */
.buy-note { margin-top: 10px; font-size: .92rem; }
.buy-list {
  max-width: 780px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.buy-row {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 20px 24px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color .2s ease, transform .2s ease;
}
.buy-row:hover { border-color: rgba(230, 51, 41, .4); transform: translateX(4px); }
.buy-name { flex: 1; }
.buy-name h3 { font-size: 1.3rem; }
.buy-name span { color: var(--muted); font-size: .85rem; }
.buy-price { text-align: right; min-width: 90px; }
.buy-price span { display: block; color: var(--muted); font-size: .75rem; text-transform: uppercase; letter-spacing: .08em; }
.buy-price strong { font-family: var(--font-head); font-size: 1.6rem; }

.store-cta { text-align: center; margin-top: 34px; }

/* ============ FOOTER ============ */
.footer {
  margin-top: 40px;
  border-top: 1px solid var(--line);
  background: var(--bg-2);
  padding: 60px clamp(16px, 5vw, 64px) 30px;
}
.footer-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 36px;
}
.footer-brand p { color: var(--muted); margin-top: 12px; font-size: .92rem; }
.footer-col h4 {
  font-family: var(--font-head);
  font-size: .9rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 14px;
}
.footer-col p { color: var(--muted); font-size: .9rem; margin-bottom: 8px; }
.footer-col .link { display: inline-block; margin-top: 4px; }

.footer-bottom {
  max-width: 1200px;
  margin: 48px auto 0;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  text-align: center;
  color: var(--muted);
  font-size: .85rem;
}

/* ============ U2 MANUAL PAGE ============ */
.manual-page { padding-top: calc(var(--nav-h) + 64px); }
.man-notes-title { font-size: 1.25rem; margin: 46px 0 16px; }
.manual-page .notes { margin: 0; max-width: 900px; }

table.manual { border-collapse: separate; border-spacing: 0; width: 100%; min-width: 760px; }
.manual th, .manual td {
  padding: 13px 16px;
  border-bottom: 1px solid var(--line);
  font-size: .9rem;
  text-align: left;
  vertical-align: top;
}
.manual thead th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: var(--card-2);
  font-family: var(--font-head);
  font-size: .78rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
}
.manual tbody tr:hover th, .manual tbody tr:hover td { background: var(--card-2); }
.manual .m-icon { width: 156px; text-align: center; }
.manual .m-icon img {
  width: 42px; height: 42px;
  object-fit: contain;
  display: inline-block;
  vertical-align: middle;
  margin: 0 3px 6px;
}
.manual .m-icon span { display: block; font-size: .76rem; color: var(--muted); }
.manual td.pre { white-space: pre-line; }
.manual tbody td:nth-child(2) { color: var(--text); }
.manual tbody td:nth-child(3) { color: var(--muted); }
.manual .m-icon span { white-space: pre-line; }

/* ============ RESPONSIVE ============ */
@media (max-width: 1024px) {
  .cards { grid-template-columns: 1fr 1fr; }
  .how-grid { grid-template-columns: 1fr; }
  .video-grid { grid-template-columns: 1fr 1fr; }
  .fw-grid { grid-template-columns: 1fr; }
  .product-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 720px) {
  .nav-links {
    position: fixed;
    top: var(--nav-h);
    left: 0; right: 0;
    flex-direction: column;
    background: rgba(10, 12, 18, .98);
    border-bottom: 1px solid var(--line);
    padding: 12px 16px 18px;
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: opacity .2s ease, transform .2s ease, visibility .2s;
  }
  .nav-links.open { opacity: 1; visibility: visible; transform: translateY(0); }
  .nav-links a { padding: 12px 14px; font-size: 1.05rem; }
  .nav-buy { display: none; }
  .nav-toggle { display: flex; }
  .cards { grid-template-columns: 1fr; }
  .video-grid { grid-template-columns: 1fr; }
  .specs { grid-template-columns: 1fr; }
  .buy-row { flex-wrap: wrap; }
  .buy-price { text-align: left; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-ring { width: 420px; height: 420px; }
  .hero-ring::before { width: 280px; height: 280px; }
  .hero-ring::after { width: 140px; height: 140px; }
}

/* ============ Reduced motion ============ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; animation: none !important; }
}