:root {
  --bg: #080908;
  --panel: #111311;
  --panel-2: #171a17;
  --ink: #f4f0e6;
  --muted: #a49d8f;
  --soft: #d5c8aa;
  --line: rgba(244, 240, 230, 0.14);
  --gold: #c9a86a;
  --amber: #e6b35b;
  --teal: #4e8f86;
  --red: #b75a45;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.38);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
select {
  font: inherit;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  padding: 0 28px;
  border-bottom: 1px solid var(--line);
  background: rgba(8, 9, 8, 0.82);
  backdrop-filter: blur(18px);
}

.brand,
.nav-links,
.hero-actions {
  display: flex;
  align-items: center;
}

.brand {
  gap: 10px;
  white-space: nowrap;
}

.brand-mark {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  width: 34px;
  height: 34px;
  padding: 7px;
  overflow: hidden;
  border: 1px solid rgba(201, 168, 106, 0.88);
  background: #11130f;
  box-shadow: inset 0 0 0 3px rgba(244, 240, 230, 0.05);
}

.brand-mark::before,
.brand-mark::after {
  position: absolute;
  content: "";
  pointer-events: none;
}

.brand-mark::before {
  inset: 3px;
  border: 1px solid rgba(244, 240, 230, 0.26);
}

.brand-mark::after {
  top: -9px;
  right: 11px;
  width: 1px;
  height: 50px;
  background: var(--gold);
  transform: rotate(43deg);
}

.brand-mark i {
  z-index: 1;
  align-self: end;
  height: 62%;
  background: var(--gold);
}

.brand-mark i:nth-child(1) {
  height: 42%;
  background: var(--teal);
}

.brand-mark i:nth-child(2) {
  height: 78%;
  background: var(--gold);
}

.brand-mark i:nth-child(3) {
  height: 56%;
  background: var(--red);
}

.brand-lockup {
  display: grid;
  gap: 1px;
  line-height: 1;
}

.brand-lockup strong {
  font-size: 14px;
  font-weight: 780;
}

.brand-lockup small {
  color: rgba(244, 240, 230, 0.44);
  font-size: 7px;
  font-weight: 760;
  letter-spacing: 0.12em;
}

.nav-links {
  gap: 4px;
}

.nav-links a {
  padding: 10px 12px;
  border-radius: 6px;
  color: var(--muted);
  font-size: 14px;
}

.nav-links a:hover {
  color: var(--ink);
  background: rgba(244, 240, 230, 0.08);
}

.hero {
  position: relative;
  min-height: clamp(620px, 92vh, 840px);
  display: flex;
  align-items: center;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.hero > img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.82) contrast(1.08) brightness(0.7);
}

.hero-shade {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(8, 9, 8, 0.94), rgba(8, 9, 8, 0.62) 48%, rgba(8, 9, 8, 0.26)),
    linear-gradient(0deg, var(--bg), rgba(8, 9, 8, 0) 28%);
}

.hero-content {
  position: relative;
  width: min(980px, 94vw);
  padding: 110px 5vw 150px 7vw;
}

.eyebrow {
  margin: 0;
  color: var(--gold);
  font-size: 12px;
  font-weight: 760;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 14px 0 18px;
  font-size: clamp(58px, 8.4vw, 120px);
  line-height: 0.92;
  letter-spacing: 0;
  overflow-wrap: normal;
  word-break: keep-all;
  white-space: nowrap;
}

.hero-copy {
  max-width: 620px;
  margin: 0;
  color: rgba(244, 240, 230, 0.78);
  font-size: clamp(17px, 2vw, 22px);
  line-height: 1.85;
}

.hero-actions {
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 12px 18px;
  border-radius: 6px;
  border: 1px solid var(--line);
  font-weight: 720;
}

.button-primary {
  border-color: var(--gold);
  background: var(--gold);
  color: #15120c;
}

.button-ghost {
  color: var(--ink);
  background: rgba(244, 240, 230, 0.08);
}

.hero-panel {
  position: absolute;
  right: 7vw;
  bottom: 74px;
  display: grid;
  gap: 8px;
  width: min(360px, calc(100% - 40px));
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(17, 19, 17, 0.72);
  box-shadow: var(--shadow);
  backdrop-filter: blur(20px);
}

.hero-panel span {
  color: var(--muted);
  font-size: 13px;
}

.hero-panel strong {
  font-size: 22px;
}

.tester-section,
.content-section,
.case-section,
.faq-section,
.wechat-section,
.site-footer {
  width: min(1360px, calc(100% - 40px));
  margin: 0 auto;
}

.tester-section {
  position: relative;
  isolation: isolate;
  padding: 96px 0 36px;
}

.grade-rail {
  display: none;
}

@media (min-width: 1800px) {
  .grade-rail {
    position: fixed;
    z-index: 2;
    top: 74px;
    bottom: 0;
    display: grid;
    width: clamp(210px, 14vw, 300px);
    grid-template-rows: auto 1fr auto;
    align-content: stretch;
    gap: clamp(24px, 4vh, 62px);
    padding: clamp(56px, 10vh, 128px) 24px 34px;
    color: rgba(244, 240, 230, 0.62);
    pointer-events: none;
    background-color: rgba(8, 9, 8, 0.38);
    opacity: 0;
    visibility: hidden;
    transition: opacity 220ms ease, transform 220ms ease, visibility 220ms step-end;
  }

  body.rails-visible .grade-rail {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
    transition: opacity 220ms ease, transform 220ms ease, visibility 0ms;
  }

  .grade-rail-left {
    left: 0;
    border-right: 1px solid rgba(244, 240, 230, 0.16);
    transform: translateX(-16px);
  }

  .grade-rail-right {
    right: 0;
    border-left: 1px solid rgba(244, 240, 230, 0.16);
    transform: translateX(16px);
  }

  .grade-rail::before,
  .grade-rail::after {
    position: absolute;
    inset: 0;
    content: "";
  }

  .grade-rail::before {
    background-image:
      repeating-linear-gradient(0deg, transparent 0 47px, rgba(244, 240, 230, 0.045) 47px 48px),
      repeating-linear-gradient(90deg, transparent 0 47px, rgba(244, 240, 230, 0.035) 47px 48px);
    opacity: 0.8;
  }

  .grade-rail::after {
    inset: 28px;
    border-top: 1px solid rgba(201, 168, 106, 0.2);
    border-bottom: 1px solid rgba(201, 168, 106, 0.12);
  }

  .grade-rail > * {
    position: relative;
    z-index: 1;
  }

  .rail-caption,
  .rail-footer,
  .scope-legend {
    display: flex;
    justify-content: space-between;
    font-size: 9px;
    font-weight: 760;
    letter-spacing: 0.12em;
  }

  .rail-caption {
    color: var(--gold);
  }

  .rail-footer {
    margin-top: auto;
    color: rgba(244, 240, 230, 0.4);
  }

  .exposure-scale {
    display: grid;
    min-height: 300px;
    grid-template-rows: repeat(5, 1fr);
  }

  .exposure-scale span {
    display: flex;
    align-items: center;
    gap: 8px;
  }

  .exposure-scale i {
    display: block;
    flex: 1;
    height: 1px;
    background: rgba(244, 240, 230, 0.16);
  }

  .exposure-scale span:nth-child(3) i {
    height: 2px;
    background: var(--gold);
  }

  .exposure-scale b {
    min-width: 18px;
    color: rgba(244, 240, 230, 0.56);
    font-size: 10px;
    font-weight: 700;
    text-align: right;
  }

  .calibration-swatches {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 4px;
    padding-top: 6px;
  }

  .calibration-swatches i {
    aspect-ratio: 1;
    border: 1px solid rgba(244, 240, 230, 0.2);
  }

  .calibration-swatches i:nth-child(1) { background: #c9a86a; }
  .calibration-swatches i:nth-child(2) { background: #4e8f86; }
  .calibration-swatches i:nth-child(3) { background: #b75a45; }
  .calibration-swatches i:nth-child(4) { background: #d5c8aa; }

  .scope-screen {
    position: relative;
    min-height: 300px;
    overflow: hidden;
    border-top: 1px solid rgba(244, 240, 230, 0.14);
    border-bottom: 1px solid rgba(244, 240, 230, 0.14);
    background-image:
      repeating-linear-gradient(0deg, transparent 0 27px, rgba(244, 240, 230, 0.08) 27px 28px),
      repeating-linear-gradient(90deg, transparent 0 27px, rgba(244, 240, 230, 0.06) 27px 28px);
  }

  .scope-trace {
    position: absolute;
    left: 10%;
    width: 72%;
    height: 1px;
    opacity: 0.78;
  }

  .scope-trace::after {
    position: absolute;
    top: 0;
    left: 18%;
    width: 44%;
    height: 1px;
    content: "";
  }

  .trace-red {
    top: 35%;
    background: var(--red);
    transform: rotate(-8deg);
    box-shadow: 20px 30px 0 rgba(183, 90, 69, 0.72), 52px -16px 0 rgba(183, 90, 69, 0.62), 80px 18px 0 rgba(183, 90, 69, 0.58);
  }

  .trace-red::after {
    background: rgba(183, 90, 69, 0.72);
    transform: rotate(18deg);
  }

  .trace-teal {
    top: 58%;
    background: var(--teal);
    transform: rotate(6deg);
    box-shadow: 26px -20px 0 rgba(78, 143, 134, 0.66), 56px 12px 0 rgba(78, 143, 134, 0.58), 92px -8px 0 rgba(78, 143, 134, 0.52);
  }

  .trace-teal::after {
    background: rgba(78, 143, 134, 0.7);
    transform: rotate(-15deg);
  }

  .trace-gold {
    top: 74%;
    background: var(--gold);
    transform: rotate(-3deg);
    box-shadow: 28px -11px 0 rgba(201, 168, 106, 0.7), 66px 10px 0 rgba(201, 168, 106, 0.6), 100px -16px 0 rgba(201, 168, 106, 0.52);
  }

  .trace-gold::after {
    background: rgba(201, 168, 106, 0.72);
    transform: rotate(12deg);
  }

  .scope-legend {
    color: rgba(244, 240, 230, 0.48);
  }

  .scope-legend span:nth-child(1) { color: var(--red); }
  .scope-legend span:nth-child(2) { color: var(--teal); }
  .scope-legend span:nth-child(4) { color: var(--gold); }
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(220px, 420px) minmax(260px, 560px);
  gap: 30px;
  align-items: end;
  margin-bottom: 28px;
}

.section-heading.compact {
  display: block;
  max-width: 720px;
}

#series .section-heading.compact {
  max-width: none;
}

#series {
  position: relative;
  isolation: isolate;
  padding-top: 108px;
}

#series::before {
  content: "";
  position: absolute;
  z-index: -1;
  pointer-events: none;
}

#series::before {
  inset: 34px auto auto 50%;
  width: min(92vw, 1440px);
  height: 520px;
  border: 1px solid rgba(244, 240, 230, 0.06);
  background:
    linear-gradient(90deg, rgba(201, 168, 106, 0.08), transparent 32% 100%),
    linear-gradient(135deg, rgba(255, 255, 255, 0.028) 0 1px, transparent 1px 120px);
  transform: translateX(-50%);
}

#series .section-heading h2 {
  white-space: nowrap;
  overflow-wrap: normal;
  word-break: keep-all;
  font-size: clamp(30px, 4.1vw, 58px);
  line-height: 1.08;
}

.series-package-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.series-package-button {
  min-height: 42px;
  padding: 10px 16px;
  border: 1px solid rgba(201, 168, 106, 0.72);
  border-radius: 6px;
  color: var(--ink);
  background: rgba(201, 168, 106, 0.1);
  font-weight: 760;
  cursor: pointer;
}

.series-package-button.is-active {
  color: #15120c;
  background: var(--gold);
}

.section-heading h2 {
  margin: 8px 0 0;
  font-size: clamp(30px, 4.8vw, 58px);
  line-height: 1.05;
}

.section-heading > p:last-child,
.wechat-section p {
  margin: 0;
  color: var(--muted);
  line-height: 1.75;
}

.tester-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 18px;
  align-items: stretch;
}

.preview-stage,
.control-panel,
.price-card,
.faq-list,
.wechat-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.preview-stage {
  position: relative;
  overflow: hidden;
}

.compare-frame {
  position: relative;
  min-height: 520px;
  background:
    linear-gradient(45deg, rgba(255, 255, 255, 0.035) 25%, transparent 25% 75%, rgba(255, 255, 255, 0.035) 75%),
    #0d0f0d;
  overflow: hidden;
  touch-action: none;
  cursor: crosshair;
  user-select: none;
}

.compare-frame img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.compare-frame:not(.has-image) img,
.compare-frame:not(.has-image) .graded-layer,
.compare-frame:not(.has-image) .compare-handle {
  display: none;
}

.compare-frame.has-image .upload-empty {
  display: none;
}

.replace-image-button {
  position: absolute;
  top: 16px;
  right: 16px;
  z-index: 7;
  display: none;
  min-height: 40px;
  padding: 0 16px;
  border: 1px solid rgba(201, 168, 106, 0.72);
  border-radius: 6px;
  color: var(--paper);
  background: rgba(8, 9, 8, 0.88);
  font: inherit;
  font-weight: 760;
  cursor: pointer;
  backdrop-filter: blur(12px);
}

.compare-frame.has-image .replace-image-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.replace-image-button:hover {
  color: #0a0b0a;
  background: var(--gold);
}

.graded-layer {
  position: absolute;
  inset: 0;
  width: 100%;
  clip-path: inset(0 50% 0 0);
  border-right: 1px solid rgba(244, 240, 230, 0.72);
  pointer-events: none;
}

.graded-layer img {
  width: 100%;
  max-width: 100%;
}

.compare-handle {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 48px;
  background: transparent;
  transform: translateX(-24px);
  cursor: ew-resize;
  pointer-events: auto;
  z-index: 4;
}

.compare-handle::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 2px;
  background: var(--gold);
  transform: translateX(-1px);
}

.compare-handle::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 42px;
  height: 42px;
  border: 1px solid var(--gold);
  border-radius: 50%;
  background: rgba(8, 9, 8, 0.86);
  transform: translate(-50%, -50%);
}

.compare-frame.is-dragging .compare-handle::after {
  background: var(--gold);
  box-shadow: 0 0 0 8px rgba(201, 168, 106, 0.14);
}

.upload-empty {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 10px;
  padding: 28px;
  text-align: center;
  cursor: pointer;
}

.upload-empty span {
  color: var(--gold);
  font-size: 13px;
  font-weight: 760;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.upload-empty strong {
  font-size: clamp(22px, 4vw, 38px);
}

.compare-frame:not(.has-image):hover .upload-empty strong {
  color: var(--gold);
}

.preview-error {
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 18px;
  z-index: 6;
  padding: 12px 14px;
  border: 1px solid rgba(224, 75, 75, 0.54);
  border-radius: 6px;
  color: #ffe1d9;
  background: rgba(42, 12, 10, 0.92);
  font-size: 14px;
  line-height: 1.5;
}

.control-panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 16px;
}

.field-group label {
  color: var(--gold);
  font-size: 12px;
  font-weight: 760;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.camera-selector {
  display: grid;
  gap: 7px;
  padding: 14px;
  border: 1px solid rgba(201, 168, 106, 0.28);
  border-radius: 8px;
  background: rgba(201, 168, 106, 0.08);
}

.camera-selector > span {
  color: var(--gold);
  font-size: 12px;
  font-weight: 760;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.camera-options {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}

.camera-option {
  min-height: 38px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  background: rgba(244, 240, 230, 0.06);
  font-weight: 760;
  cursor: pointer;
}

.camera-option.is-active {
  border-color: var(--gold);
  color: #15120c;
  background: var(--gold);
}

.input-profile-card {
  display: grid;
  gap: 7px;
  padding: 14px;
  border: 1px solid rgba(78, 143, 134, 0.34);
  border-radius: 8px;
  background: linear-gradient(135deg, rgba(78, 143, 134, 0.13), rgba(201, 168, 106, 0.06));
}

.input-profile-card span {
  color: var(--gold);
  font-size: 12px;
  font-weight: 760;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.input-profile-card strong {
  color: var(--ink);
  font-size: 15px;
}

.field-group {
  display: grid;
  gap: 9px;
}

select,
input[type="range"] {
  width: 100%;
}

select {
  min-height: 44px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  background: #0d0f0d;
}

input[type="range"] {
  accent-color: var(--gold);
  cursor: pointer;
}

.lut-list {
  display: grid;
  gap: 10px;
  max-height: 360px;
  overflow: auto;
  padding-right: 4px;
}

.lut-button {
  width: 100%;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  background: var(--panel-2);
  text-align: left;
  cursor: pointer;
}

.lut-button:disabled {
  opacity: 0.46;
  cursor: not-allowed;
}

.lut-button.is-active {
  border-color: var(--gold);
  background: rgba(201, 168, 106, 0.12);
}

.lut-button strong {
  display: block;
  margin-bottom: 6px;
  font-size: 16px;
}

.lut-button span,
.lut-button p {
  color: var(--muted);
  font-size: 13px;
}

.lut-button p {
  margin: 8px 0 0;
  line-height: 1.55;
}

.content-section,
.case-section,
.faq-section,
.wechat-section {
  padding: 92px 0 0;
}

.series-grid,
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-top: 26px;
}

.price-card {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.series-grid article {
  min-height: 116px;
  display: grid;
  align-content: space-between;
  padding: 18px 18px 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(201, 168, 106, 0.08), transparent 42%),
    rgba(17, 19, 17, 0.9);
}

.series-grid article:hover {
  border-color: rgba(201, 168, 106, 0.48);
  background:
    linear-gradient(135deg, rgba(201, 168, 106, 0.16), transparent 46%),
    rgba(23, 26, 23, 0.94);
}

.series-grid span {
  color: var(--gold);
  font-size: 13px;
  font-weight: 760;
}

.series-grid h3,
.price-card h3 {
  margin: 14px 0 0;
  font-size: 22px;
}

.series-grid h3 {
  line-height: 1.25;
}

.series-grid p,
.price-card li,
.faq-list p {
  color: var(--muted);
  line-height: 1.7;
}

.series-coming-soon {
  min-height: 84px;
  margin-top: 20px;
  border-top: 1px solid rgba(244, 240, 230, 0.08);
  background:
    linear-gradient(90deg, transparent, rgba(201, 168, 106, 0.06), transparent),
    linear-gradient(180deg, rgba(244, 240, 230, 0.03), transparent);
}

.case-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 24px;
}

.case-card {
  min-height: 260px;
  display: flex;
  align-items: end;
  padding: 18px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background:
    linear-gradient(0deg, rgba(8, 9, 8, 0.84), rgba(8, 9, 8, 0.05)),
    linear-gradient(135deg, #333, #111);
}

.case-card.warm {
  background:
    linear-gradient(0deg, rgba(8, 9, 8, 0.84), rgba(8, 9, 8, 0.05)),
    linear-gradient(135deg, #5d2f1f, #c4924d, #18211c);
}

.case-card.neon {
  background:
    linear-gradient(0deg, rgba(8, 9, 8, 0.84), rgba(8, 9, 8, 0.05)),
    linear-gradient(135deg, #101525, #12656d, #b24b75);
}

.case-card.forest {
  background:
    linear-gradient(0deg, rgba(8, 9, 8, 0.84), rgba(8, 9, 8, 0.05)),
    linear-gradient(135deg, #1b2b28, #6f7a46, #d2b783);
}

.case-card span {
  font-size: 22px;
  font-weight: 760;
}

.pricing-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.price-card p {
  margin: 0;
  color: var(--gold);
  font-weight: 760;
}

.price-card ul {
  display: grid;
  gap: 8px;
  min-height: 112px;
  margin: 0 0 18px;
  padding-left: 18px;
}

.price-card a,
.wechat-card button {
  display: inline-flex;
  justify-content: center;
  min-height: 42px;
  padding: 11px 14px;
  border: 1px solid var(--gold);
  border-radius: 6px;
  background: var(--gold);
  color: #15120c;
  font-weight: 760;
}

.price-card.is-featured {
  border-color: rgba(201, 168, 106, 0.72);
  background: linear-gradient(180deg, rgba(201, 168, 106, 0.16), var(--panel));
}

.faq-list {
  display: grid;
  gap: 1px;
  padding: 8px;
  margin-top: 24px;
}

details {
  padding: 16px;
  border-radius: 6px;
  background: var(--panel-2);
}

summary {
  cursor: pointer;
  font-weight: 760;
}

.wechat-section {
  display: grid;
  grid-template-columns: minmax(260px, 1fr) 340px;
  gap: 20px;
  align-items: center;
  padding-bottom: 54px;
}

.wechat-section h2 {
  margin: 8px 0 12px;
  font-size: clamp(32px, 5vw, 62px);
}

.wechat-card {
  display: grid;
  gap: 10px;
  padding: 20px;
}

.wechat-card span {
  color: var(--muted);
}

.wechat-card strong {
  font-size: 30px;
}

.wechat-card button {
  width: 100%;
  cursor: pointer;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 28px 0 42px;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.site-footer span:first-child {
  color: var(--ink);
  font-weight: 760;
}

.site-footer a {
  color: inherit;
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--gold);
}

.record-links,
.police-record {
  display: inline-flex;
  align-items: center;
}

.record-links {
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 14px;
}

.police-record {
  gap: 6px;
  white-space: nowrap;
}

.police-record img {
  width: 18px;
  height: 18px;
  object-fit: contain;
}

@media (max-width: 980px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
    padding: 14px 20px;
  }

  .nav-links {
    width: 100%;
    overflow-x: auto;
  }

  .tester-shell,
  .section-heading,
  .wechat-section {
    grid-template-columns: 1fr;
  }

  .series-grid,
  .pricing-grid,
  .case-strip {
    grid-template-columns: 1fr 1fr;
  }

  .graded-layer img {
    width: calc(100vw - 40px);
  }
}

@media (max-width: 640px) {
  .hero {
    min-height: 720px;
  }

  .hero-content {
    padding: 92px 24px 150px;
  }

  h1 {
    font-size: clamp(42px, 12vw, 68px);
  }

  .hero-panel {
    left: 20px;
    right: 20px;
    bottom: 40px;
    width: auto;
  }

  .tester-section,
  .content-section,
  .case-section,
  .faq-section,
  .wechat-section,
  .site-footer {
    width: min(100% - 28px, 1180px);
  }

  .compare-frame {
    min-height: 420px;
  }

  .site-footer {
    flex-direction: column;
  }

  .record-links {
    justify-content: flex-start;
  }

  .series-grid,
  .pricing-grid,
  .case-strip {
    grid-template-columns: 1fr;
  }

  #series .section-heading h2 {
    font-size: clamp(17px, 4.5vw, 24px);
  }
}