:root {
  --ink: #f6f1e8;
  --ink-soft: rgba(246, 241, 232, 0.72);
  --charcoal: #111316;
  --panel: #1a1d21;
  --panel-soft: #23272d;
  --line: rgba(246, 241, 232, 0.14);
  --amber: #d99a3c;
  --amber-strong: #f0aa42;
  --copper: #b86438;
  --blue: #43b7c8;
  --paper: #f5efe5;
  --paper-ink: #191b1f;
  --muted: #6f6b63;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.26);
  --header-height: 74px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--charcoal);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.62;
}

button,
input,
textarea {
  font: inherit;
}

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

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 30;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  width: 100%;
  min-height: var(--header-height);
  padding: 0 clamp(18px, 4vw, 56px);
  color: var(--ink);
  transition: background 180ms ease, box-shadow 180ms ease;
}

.site-header.is-scrolled,
.site-header.is-open {
  background: rgba(17, 19, 22, 0.92);
  box-shadow: 0 12px 34px rgba(0, 0, 0, 0.28);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 224px;
}

.brand-mark {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  border-radius: 8px;
  color: #17110a;
  background: linear-gradient(135deg, #ffd28a, var(--amber));
  font-weight: 950;
  box-shadow: 0 14px 28px rgba(217, 154, 60, 0.28);
}

.brand-text {
  display: grid;
  gap: 1px;
  line-height: 1.1;
}

.brand-text strong {
  font-size: 16px;
}

.brand-text small {
  color: var(--ink-soft);
  font-size: 11px;
  font-weight: 750;
  text-transform: uppercase;
}

.nav {
  display: flex;
  justify-content: center;
  gap: clamp(18px, 2.7vw, 34px);
  font-size: 14px;
  font-weight: 780;
}

.nav a {
  position: relative;
  padding: 8px 0;
}

.nav a::after {
  position: absolute;
  right: 0;
  bottom: 2px;
  left: 0;
  height: 2px;
  content: "";
  background: var(--amber);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 180ms ease;
}

.nav a:hover::after,
.nav a.is-active::after {
  transform: scaleX(1);
}

.header-cta,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  font-weight: 880;
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.header-cta {
  min-height: 42px;
  padding: 0 18px;
  border: 1px solid rgba(246, 241, 232, 0.42);
}

.header-cta:hover,
.button:hover {
  transform: translateY(-2px);
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 10px;
  border: 1px solid rgba(246, 241, 232, 0.46);
  border-radius: 8px;
  color: inherit;
  background: rgba(17, 19, 22, 0.2);
}

.menu-toggle span {
  display: block;
  height: 2px;
  margin: 5px 0;
  background: currentColor;
  border-radius: 99px;
}

.hero {
  position: relative;
  min-height: 86svh;
  padding-top: var(--header-height);
  overflow: hidden;
}

.hero-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(10, 11, 13, 0.96) 0%, rgba(10, 11, 13, 0.8) 39%, rgba(10, 11, 13, 0.28) 68%, rgba(10, 11, 13, 0.44) 100%),
    linear-gradient(0deg, rgba(10, 11, 13, 0.34), rgba(10, 11, 13, 0.04));
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: calc(86svh - var(--header-height));
  width: min(1160px, calc(100% - 36px));
  margin: 0 auto;
  padding: clamp(34px, 6vw, 74px) 0;
}

.eyebrow,
.section-kicker,
.service-label {
  margin: 0 0 14px;
  color: var(--amber-strong);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0;
}

.hero h1 {
  width: min(940px, 100%);
  margin: 0;
  font-size: clamp(44px, 6.3vw, 78px);
  line-height: 1.02;
  letter-spacing: 0;
}

.title-tail {
  white-space: nowrap;
}

.hero-copy {
  width: min(670px, 100%);
  margin: 24px 0 0;
  color: rgba(246, 241, 232, 0.84);
  font-size: clamp(18px, 2vw, 23px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.button {
  min-height: 50px;
  padding: 0 23px;
  border: 1px solid transparent;
}

.button.primary {
  color: #17110a;
  background: linear-gradient(135deg, #ffd18a, var(--amber-strong));
  box-shadow: 0 20px 38px rgba(217, 154, 60, 0.28);
}

.button.secondary {
  color: var(--ink);
  border-color: rgba(246, 241, 232, 0.52);
  background: rgba(246, 241, 232, 0.08);
}

.hero-proof {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 30px;
}

.hero-proof span {
  padding: 8px 12px;
  border: 1px solid rgba(246, 241, 232, 0.18);
  border-radius: 8px;
  color: rgba(246, 241, 232, 0.86);
  background: rgba(246, 241, 232, 0.08);
  font-size: 14px;
  font-weight: 760;
}

.section-inner {
  width: min(1160px, calc(100% - 36px));
  margin: 0 auto;
}

.trust-strip {
  padding: clamp(22px, 4vw, 36px) 0;
  color: var(--paper-ink);
  background: var(--paper);
}

.trust-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  border: 1px solid rgba(25, 27, 31, 0.14);
  border-radius: 8px;
  background: rgba(25, 27, 31, 0.14);
}

.trust-grid div {
  display: grid;
  gap: 3px;
  min-height: 104px;
  padding: 20px;
  align-content: center;
  background: #fffaf1;
}

.trust-grid strong {
  color: #17110a;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1;
}

.trust-grid span {
  color: var(--muted);
  font-weight: 760;
}

.section {
  padding: clamp(70px, 9vw, 124px) 0;
}

.section h2,
.about-copy h2,
.contact-copy h2 {
  margin: 0;
  font-size: clamp(31px, 4.2vw, 58px);
  line-height: 1.12;
  letter-spacing: 0;
}

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

.about-section,
.fit-section,
.contact-section {
  background: var(--charcoal);
}

.about-layout,
.fit-layout,
.guarantee-layout,
.contact-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 0.72fr);
  gap: clamp(32px, 6vw, 86px);
  align-items: start;
}

.about-copy p {
  max-width: 760px;
  margin: 22px 0 0;
  font-size: 17px;
}

.experience-panel,
.fit-card,
.store-card,
.contact-form {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.035));
  box-shadow: var(--shadow);
}

.experience-panel {
  padding: clamp(24px, 4vw, 34px);
}

.experience-panel h3,
.store-card h3 {
  margin: 0 0 18px;
  font-size: 24px;
}

.experience-panel ul,
.store-card ul {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.experience-panel li,
.store-card li {
  display: grid;
  grid-template-columns: 58px 1fr;
  gap: 12px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
  color: rgba(246, 241, 232, 0.82);
}

.experience-panel li:last-child,
.store-card li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.experience-panel span,
.store-card span {
  color: var(--amber-strong);
  font-weight: 900;
}

.service-section,
.process-section,
.faq-section {
  color: var(--paper-ink);
  background: var(--paper);
}

.service-section p,
.process-section p,
.faq-section p {
  color: var(--muted);
}

.section-head {
  display: grid;
  gap: 14px;
  margin-bottom: clamp(30px, 5vw, 56px);
}

.section-head.split {
  grid-template-columns: minmax(0, 0.9fr) minmax(280px, 0.58fr);
  align-items: end;
  gap: clamp(24px, 5vw, 70px);
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.service-card {
  overflow: hidden;
  border: 1px solid rgba(25, 27, 31, 0.12);
  border-radius: 8px;
  background: #fffaf1;
  box-shadow: 0 18px 46px rgba(25, 27, 31, 0.1);
}

.service-media {
  display: block;
  width: 100%;
  height: 240px;
  min-height: 240px;
  object-fit: cover;
  object-position: center;
}

.service-body {
  padding: clamp(22px, 3vw, 30px);
}

.service-body h3,
.fit-points h3,
.process-list h3,
.guarantee-grid h3 {
  margin: 0 0 10px;
  font-size: 24px;
  line-height: 1.2;
  letter-spacing: 0;
}

.service-label {
  color: var(--copper);
}

.brands-section,
.guarantee-section {
  background: #0d0f11;
}

.brand-lead {
  margin-bottom: clamp(24px, 4vw, 40px);
}

.brand-visuals {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 16px;
  margin-bottom: 18px;
}

.brand-visuals figure {
  position: relative;
  min-height: 250px;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.brand-visuals img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 250px;
  object-fit: cover;
}

.brand-visuals figcaption {
  position: absolute;
  right: 14px;
  bottom: 14px;
  left: 14px;
  padding: 10px 12px;
  border: 1px solid rgba(246, 241, 232, 0.16);
  border-radius: 8px;
  color: rgba(246, 241, 232, 0.9);
  background: rgba(8, 9, 10, 0.68);
  backdrop-filter: blur(10px);
  font-size: 14px;
  font-weight: 760;
}

.brand-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
}

.brand-card {
  display: grid;
  gap: 14px;
  min-height: 272px;
  padding: 16px;
  border: 1px solid rgba(246, 241, 232, 0.14);
  border-radius: 8px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.075), rgba(255, 255, 255, 0.035));
  box-shadow: 0 18px 46px rgba(0, 0, 0, 0.18);
}

.logo-plate {
  display: grid;
  min-height: 78px;
  padding: 12px;
  align-content: center;
  justify-items: start;
  border: 1px solid rgba(246, 241, 232, 0.18);
  border-radius: 8px;
  color: #15171a;
  background: #f7f0e3;
}

.logo-plate span {
  display: block;
  max-width: 100%;
  overflow-wrap: anywhere;
  font-size: 22px;
  line-height: 1;
  font-weight: 950;
  letter-spacing: 0;
}

.logo-plate small {
  margin-top: 7px;
  color: rgba(21, 23, 26, 0.64);
  font-size: 12px;
  font-weight: 850;
}

.logo-dynaudio span,
.logo-focal span,
.logo-alpine span,
.logo-helix span,
.logo-genesis span {
  letter-spacing: 0.02em;
}

.logo-harman span {
  font-size: 19px;
  font-weight: 780;
}

.logo-dr span {
  font-size: 34px;
  letter-spacing: 0.06em;
}

.logo-focal {
  color: #fffaf1;
  background: #17191c;
}

.logo-focal small {
  color: rgba(255, 250, 241, 0.66);
}

.logo-harman {
  background: linear-gradient(135deg, #f7f0e3, #d6c4a1);
}

.logo-pioneer span {
  font-size: 23px;
  font-style: italic;
}

.logo-alpine {
  color: #f7f0e3;
  background: #0d3f76;
}

.logo-alpine small {
  color: rgba(247, 240, 227, 0.7);
}

.logo-gehang {
  background: linear-gradient(135deg, #fff6dd, #f0aa42);
}

.logo-dr {
  color: #f7f0e3;
  background: #111316;
}

.logo-dr small {
  color: rgba(247, 240, 227, 0.68);
}

.logo-helix {
  color: #f7f0e3;
  background: #1e252b;
}

.logo-helix small {
  color: rgba(247, 240, 227, 0.68);
}

.brand-card h3 {
  margin: 0;
  color: var(--ink);
  font-size: 20px;
  line-height: 1.25;
  letter-spacing: 0;
}

.brand-card p {
  margin: 0;
  color: rgba(246, 241, 232, 0.72);
  font-size: 14px;
}

.brand-note {
  margin: 18px 0 0;
  color: rgba(246, 241, 232, 0.58);
  font-size: 14px;
}

.fit-card {
  padding: clamp(24px, 4vw, 36px);
}

.fit-card p {
  margin: 22px 0 0;
}

.fit-points {
  display: grid;
  gap: 16px;
}

.fit-points article {
  display: grid;
  gap: 6px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.fit-points span,
.process-list span {
  color: var(--amber-strong);
  font-weight: 950;
}

.fit-points p {
  margin: 0;
}

.process-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  overflow: hidden;
  border: 1px solid rgba(25, 27, 31, 0.14);
  border-radius: 8px;
  list-style: none;
  background: rgba(25, 27, 31, 0.14);
}

.process-list li {
  min-height: 248px;
  padding: clamp(22px, 3vw, 30px);
  background: #fffaf1;
}

.process-list h3 {
  margin-top: 26px;
}

.process-list p {
  margin: 0;
}

.guarantee-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.guarantee-grid article {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.055);
}

.guarantee-grid p {
  margin: 0;
}

.faq-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.faq-grid article {
  min-height: 214px;
  padding: clamp(22px, 3vw, 28px);
  border: 1px solid rgba(25, 27, 31, 0.12);
  border-radius: 8px;
  background: #fffaf1;
  box-shadow: 0 16px 42px rgba(25, 27, 31, 0.08);
}

.faq-grid h3 {
  margin: 0 0 12px;
  font-size: 21px;
  line-height: 1.25;
  letter-spacing: 0;
}

.faq-grid p {
  margin: 0;
}

.contact-copy > p {
  margin: 22px 0 0;
  font-size: 17px;
}

.store-card {
  margin-top: 30px;
  padding: clamp(22px, 4vw, 30px);
}

.contact-form {
  display: grid;
  gap: 18px;
  padding: clamp(22px, 4vw, 34px);
}

.contact-form label {
  display: grid;
  gap: 8px;
  color: var(--ink);
  font-weight: 850;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  border: 1px solid rgba(246, 241, 232, 0.2);
  border-radius: 8px;
  padding: 13px 14px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.08);
  outline: none;
  transition: border 160ms ease, box-shadow 160ms ease;
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: rgba(246, 241, 232, 0.46);
}

.contact-form textarea {
  min-height: 132px;
  resize: vertical;
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: var(--amber);
  box-shadow: 0 0 0 4px rgba(217, 154, 60, 0.14);
}

.form-button {
  width: 100%;
}

.form-status {
  min-height: 24px;
  margin: 0;
  color: #ffd18a;
  font-weight: 820;
}

.site-footer {
  padding: 26px 0;
  color: rgba(246, 241, 232, 0.74);
  background: #08090a;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 18px;
}

.footer-inner p {
  margin: 0;
}

.footer-inner a {
  font-weight: 850;
}

@media (max-width: 980px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .brand {
    min-width: 0;
  }

  .header-cta {
    display: none;
  }

  .menu-toggle {
    display: block;
  }

  .nav {
    position: fixed;
    top: var(--header-height);
    right: 0;
    left: 0;
    display: grid;
    justify-content: stretch;
    gap: 0;
    padding: 10px 18px 22px;
    color: var(--ink);
    background: rgba(17, 19, 22, 0.98);
    box-shadow: 0 22px 32px rgba(0, 0, 0, 0.26);
    transform: translateY(-120%);
    transition: transform 200ms ease;
  }

  .site-header.is-open .nav {
    transform: translateY(0);
  }

  .nav a {
    padding: 14px 0;
    border-bottom: 1px solid var(--line);
  }

  .hero {
    min-height: 86svh;
  }

  .hero-image {
    object-position: 58% center;
  }

  .trust-grid,
  .service-grid,
  .brand-grid,
  .process-list,
  .faq-grid {
    grid-template-columns: 1fr 1fr;
  }

  .about-layout,
  .fit-layout,
  .guarantee-layout,
  .contact-layout,
  .section-head.split {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  :root {
    --header-height: 68px;
  }

  .site-header {
    padding: 0 16px;
  }

  .brand-mark {
    width: 36px;
    height: 36px;
  }

  .brand-text strong {
    font-size: 15px;
  }

  .brand-text small {
    display: none;
  }

  .hero {
    min-height: 84svh;
  }

  .hero-image {
    object-position: 68% center;
  }

  .hero-overlay {
    background:
      linear-gradient(90deg, rgba(10, 11, 13, 0.96) 0%, rgba(10, 11, 13, 0.84) 56%, rgba(10, 11, 13, 0.54) 100%),
      linear-gradient(0deg, rgba(10, 11, 13, 0.36), rgba(10, 11, 13, 0.08));
  }

  .hero-inner {
    min-height: calc(84svh - var(--header-height));
    width: min(100% - 32px, 1160px);
  }

  .hero-actions,
  .button {
    width: 100%;
  }

  .trust-grid,
  .service-grid,
  .brand-grid,
  .brand-visuals,
  .process-list,
  .faq-grid {
    grid-template-columns: 1fr;
  }

  .service-media {
    min-height: 210px;
  }

  .brand-card {
    min-height: auto;
  }

  .brand-visuals figure,
  .brand-visuals img {
    min-height: 220px;
  }

  .process-list li {
    min-height: auto;
  }

  .experience-panel li,
  .store-card li {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .footer-inner {
    display: grid;
  }
}