/* ==========================================================================
   Doguard 多固德 — Official Site Styles
   Industrial B2B · charcoal / steel blue / amber CTA
   Fonts loaded via <link> in layout/base.html (avoid render-blocking @import)
   ========================================================================== */

/* ---------- CSS Variables ---------- */
:root {
  /* Colors live in palette.css — keep only type/layout here */
  --font-display: "Barlow Condensed", "Noto Sans SC", sans-serif;
  --font-body: "Noto Sans SC", system-ui, sans-serif;

  --container: 1180px;
  --gutter: 1.25rem;
  --transition: 0.25s ease;
  --transition-slow: 0.45s ease;
}

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

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

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-surface);
  background-image: var(--texture);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-steel);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-steel-hover);
}

ul,
ol {
  list-style: none;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

table {
  border-collapse: collapse;
  width: 100%;
}

/* ---------- Typography ---------- */
h1,
h2,
h3,
h4,
.h1,
.h2,
.h3 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.02em;
  color: var(--color-charcoal);
}

h1,
.h1 {
  font-size: clamp(2rem, 4vw, 3.25rem);
  font-weight: 800;
}

h2,
.h2 {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
}

h3,
.h3 {
  font-size: clamp(1.25rem, 2vw, 1.5rem);
  font-weight: 600;
}

h4 {
  font-size: 1.125rem;
  font-weight: 600;
}

.lead {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  max-width: 42em;
}

.text-muted {
  color: var(--color-text-muted);
}

.text-steel {
  color: var(--color-steel);
}

.text-amber {
  color: var(--color-amber);
}

.section-label {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-steel);
  margin-bottom: 0.5rem;
}

.section-title {
  margin-bottom: 0.75rem;
}

.section-title .underline-grow {
  display: inline-block;
}

/* Underline grow motion */
.underline-grow {
  position: relative;
}

.underline-grow::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 100%;
  height: 3px;
  background: var(--color-amber);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-slow);
}

.underline-grow.is-visible::after,
.section-header:hover .underline-grow::after,
a.underline-grow:hover::after {
  transform: scaleX(1);
}

/* Fade-up motion */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.fade-up {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

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

.fade-up-delay-1 {
  transition-delay: 0.1s;
}
.fade-up-delay-2 {
  transition-delay: 0.2s;
}
.fade-up-delay-3 {
  transition-delay: 0.3s;
}

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-block: 4.5rem;
}

.section--alt {
  background: var(--color-surface-alt);
}

.section--dark {
  background: var(--color-charcoal);
  color: var(--color-text-inverse);
}

.section--dark h2,
.section--dark h3,
.section--dark .section-title {
  color: var(--color-text-inverse);
}

.section-header {
  margin-bottom: 2.5rem;
  max-width: 40rem;
}

.section-header--center {
  text-align: center;
  margin-inline: auto;
}

.grid {
  display: grid;
  gap: 1.5rem;
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}
.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}
.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1.2;
  border-radius: var(--radius);
  border: 2px solid transparent;
  transition: background var(--transition), color var(--transition),
    border-color var(--transition), transform var(--transition),
    box-shadow var(--transition);
  white-space: nowrap;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: var(--color-amber);
  color: #fff;
  border-color: var(--color-amber);
}

.btn-primary:hover {
  background: var(--color-amber-hover);
  border-color: var(--color-amber-hover);
  color: #fff;
}

.btn-steel {
  background: var(--color-steel);
  color: #fff;
  border-color: var(--color-steel);
}

.btn-steel:hover {
  background: var(--color-steel-hover);
  border-color: var(--color-steel-hover);
  color: #fff;
}

.btn-outline {
  background: transparent;
  color: var(--color-charcoal);
  border-color: var(--color-charcoal);
}

.btn-outline:hover {
  background: var(--color-charcoal);
  color: #fff;
}

.btn-outline-light {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.7);
}

.btn-outline-light:hover {
  background: #fff;
  color: var(--color-charcoal);
  border-color: #fff;
}

.btn-ghost {
  background: transparent;
  color: var(--color-steel);
  border-color: transparent;
  padding-inline: 0.5rem;
}

.btn-ghost:hover {
  color: var(--color-steel-hover);
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1.125rem;
}

.btn-sm {
  padding: 0.45rem 0.9rem;
  font-size: 0.875rem;
}

.btn-block {
  width: 100%;
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: auto;
  min-height: var(--header-h);
  background: rgba(15, 23, 42, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: background var(--transition), box-shadow var(--transition),
    border-color var(--transition);
}

.site-header.is-scrolled {
  background: rgba(15, 23, 42, 0.98);
  border-bottom-color: rgba(var(--rgb-steel), 0.25);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  gap: 1.5rem;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
  color: #fff;
  text-decoration: none;
}

.site-logo:hover {
  color: #fff;
}

.site-logo__mark {
  height: 40px;
  width: auto;
}

.site-logo__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.site-logo__brand {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.site-logo__cn {
  font-size: 0.75rem;
  font-weight: 500;
  color: rgba(248, 250, 252, 0.7);
  letter-spacing: 0.15em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.site-nav__link {
  position: relative;
  padding: 0.5rem 0.85rem;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: rgba(248, 250, 252, 0.85);
  transition: color var(--transition);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0.85rem;
  right: 0.85rem;
  bottom: 0.2rem;
  height: 2px;
  background: var(--color-amber);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.site-nav__link:hover,
.site-nav__link.is-active {
  color: #fff;
}

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

.site-header__actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-shrink: 0;
}

.site-header__phone {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  color: #fff;
  line-height: 1.2;
}

.site-header__phone-label {
  font-size: 0.7rem;
  color: rgba(248, 250, 252, 0.55);
  letter-spacing: 0.05em;
}

.site-header__phone-num {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: #fff;
}

.site-header__phone-num:hover {
  color: var(--color-amber);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.nav-toggle__bar {
  display: block;
  height: 2px;
  width: 100%;
  background: #fff;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle.is-open .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle.is-open .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}
.nav-toggle.is-open .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- Hero (full-bleed, brand-first, no cards) ---------- */
.hero {
  position: relative;
  min-height: calc(100vh - var(--header-h));
  min-height: min(720px, calc(100vh - var(--header-h)));
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  background: var(--color-charcoal);
  color: var(--color-text-inverse);
}

.hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero__media img,
.hero__media video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: var(--overlay-hero);
}

.hero__grid {
  position: absolute;
  inset: 0;
  z-index: 2;
  background-image: var(--texture);
  opacity: 0.5;
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 3;
  width: 100%;
  padding-block: 4rem 5rem;
  animation: fadeUp 0.8s ease both;
}

.hero__brand {
  font-family: var(--font-display);
  font-size: clamp(2.75rem, 7vw, 5rem);
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  line-height: 1;
  margin-bottom: 0.35rem;
  color: #fff;
}

.hero__brand-cn {
  display: block;
  font-family: var(--font-body);
  font-size: clamp(1rem, 2vw, 1.25rem);
  font-weight: 500;
  letter-spacing: 0.35em;
  color: rgba(248, 250, 252, 0.75);
  margin-top: 0.35rem;
  text-transform: none;
}

.hero__headline {
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 2.5vw, 1.85rem);
  font-weight: 600;
  letter-spacing: 0.06em;
  color: rgba(248, 250, 252, 0.95);
  margin: 1.25rem 0 0.75rem;
  max-width: 28em;
}

.hero__sub {
  font-size: 1rem;
  color: rgba(248, 250, 252, 0.65);
  max-width: 32em;
  margin-bottom: 2rem;
  line-height: 1.65;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ---------- Stats strip ---------- */
.stats-strip {
  background: var(--color-slate);
  color: #fff;
  padding-block: 2.5rem;
  border-top: 3px solid var(--color-steel);
}

.stats-strip__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  text-align: center;
}

.stat-item__value {
  font-family: var(--font-display);
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  font-weight: 800;
  letter-spacing: 0.02em;
  color: #fff;
  line-height: 1.1;
}

.stat-item__value span {
  color: var(--color-amber);
  font-size: 0.65em;
}

.stat-item__label {
  margin-top: 0.35rem;
  font-size: 0.875rem;
  color: rgba(248, 250, 252, 0.6);
}

/* ---------- Product grid ---------- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.product-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition),
    transform var(--transition);
}

.product-card:hover {
  border-color: var(--color-steel);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.product-card__media {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--color-slate);
}

.product-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.product-card:hover .product-card__media img {
  transform: scale(1.05);
}

.product-card__body {
  padding: 1.25rem 1.35rem 1.5rem;
}

.product-card__title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  margin-bottom: 0.4rem;
}

.product-card__title a {
  color: var(--color-charcoal);
}

.product-card__title a:hover {
  color: var(--color-steel);
}

.product-card__desc {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.product-card__link {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  color: var(--color-steel);
}

.product-card__link::after {
  content: " →";
  transition: margin-left var(--transition);
}

.product-card__link:hover::after {
  margin-left: 4px;
}

/* ---------- Solution grid ---------- */
.solution-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.solution-item {
  padding: 1.75rem;
  background: #fff;
  border-left: 3px solid var(--color-steel);
  border-radius: 0 var(--radius) var(--radius) 0;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.solution-item:hover {
  border-left-color: var(--color-amber);
  box-shadow: var(--shadow-md);
}

.solution-item__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-steel-soft);
  color: var(--color-steel);
  border-radius: var(--radius);
  margin-bottom: 1rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.25rem;
}

.solution-item__title {
  margin-bottom: 0.5rem;
}

.solution-item__desc {
  font-size: 0.925rem;
  color: var(--color-text-muted);
}

/* ---------- Case grid ---------- */
.case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.case-card {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--color-slate);
  aspect-ratio: 4 / 3;
}

.case-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
  opacity: 0.85;
}

.case-card:hover img {
  transform: scale(1.06);
  opacity: 1;
}

.case-card__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(15, 23, 42, 0.92) 0%, transparent 55%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 1.25rem;
  color: #fff;
}

.case-card__tag {
  font-size: 0.75rem;
  color: var(--color-amber);
  font-weight: 600;
  letter-spacing: 0.06em;
  margin-bottom: 0.25rem;
}

.case-card__title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.03em;
}

/* ---------- FAQ accordion ---------- */
.faq-list {
  max-width: 760px;
}

.faq-item {
  border-bottom: 1px solid var(--color-border);
}

.faq-item__q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: 100%;
  padding: 1.15rem 0;
  text-align: left;
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--color-charcoal);
  transition: color var(--transition);
}

.faq-item__q:hover {
  color: var(--color-steel);
}

.faq-item__icon {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border: 1.5px solid var(--color-border-strong);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: border-color var(--transition), background var(--transition);
}

.faq-item__icon::before,
.faq-item__icon::after {
  content: "";
  position: absolute;
  background: var(--color-slate-mid);
  transition: transform var(--transition), background var(--transition);
}

.faq-item__icon::before {
  width: 12px;
  height: 2px;
}

.faq-item__icon::after {
  width: 2px;
  height: 12px;
}

.faq-item.is-open .faq-item__icon {
  border-color: var(--color-steel);
  background: var(--color-steel-soft);
}

.faq-item.is-open .faq-item__icon::after {
  transform: rotate(90deg);
  opacity: 0;
}

.faq-item.is-open .faq-item__icon::before {
  background: var(--color-steel);
}

.faq-item__a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
}

.faq-item.is-open .faq-item__a {
  max-height: 400px;
}

.faq-item__a-inner {
  padding: 0 0 1.25rem;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.75;
}

/* ---------- CTA band ---------- */
.cta-band {
  position: relative;
  padding-block: 4rem;
  background: linear-gradient(135deg, var(--color-charcoal) 0%, var(--color-slate) 100%);
  color: #fff;
  overflow: hidden;
}

.cta-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: var(--texture);
  opacity: 0.4;
  pointer-events: none;
}

.cta-band__inner {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}

.cta-band__title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.04em;
  margin-bottom: 0.35rem;
}

.cta-band__sub {
  color: rgba(248, 250, 252, 0.65);
  font-size: 0.95rem;
}

.cta-band__phone {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-amber);
  letter-spacing: 0.04em;
}

/* ---------- Footer NAP ---------- */
.site-footer {
  background: var(--color-charcoal);
  color: rgba(248, 250, 252, 0.7);
  padding-top: 3.5rem;
  padding-bottom: 1.5rem;
  border-top: 3px solid var(--color-steel);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 2rem;
  margin-bottom: 2.5rem;
}

.footer-brand__logo {
  margin-bottom: 1rem;
}

.footer-brand__name {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: #fff;
  text-transform: uppercase;
}

.footer-brand__slogan {
  font-size: 0.85rem;
  margin-top: 0.5rem;
  line-height: 1.6;
}

.footer-col__title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #fff;
  margin-bottom: 1rem;
}

.footer-col__links li + li {
  margin-top: 0.5rem;
}

.footer-col__links a {
  color: rgba(248, 250, 252, 0.65);
  font-size: 0.9rem;
  transition: color var(--transition);
}

.footer-col__links a:hover {
  color: var(--color-amber);
}

.footer-nap {
  font-size: 0.9rem;
  line-height: 1.8;
}

.footer-nap dt {
  font-size: 0.75rem;
  color: rgba(248, 250, 252, 0.45);
  letter-spacing: 0.05em;
  margin-top: 0.65rem;
}

.footer-nap dt:first-child {
  margin-top: 0;
}

.footer-nap dd {
  color: rgba(248, 250, 252, 0.85);
}

.footer-nap a {
  color: rgba(248, 250, 252, 0.85);
}

.footer-nap a:hover {
  color: var(--color-amber);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.8rem;
  color: rgba(248, 250, 252, 0.4);
}

/* ---------- Breadcrumb & page header ---------- */
.breadcrumb {
  padding-block: 0.85rem;
  background: var(--color-surface-alt);
  border-bottom: 1px solid var(--color-border);
  font-size: 0.85rem;
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
}

.breadcrumb__list li:not(:last-child)::after {
  content: "/";
  margin-left: 0.35rem;
  color: var(--color-text-muted);
}

.breadcrumb a {
  color: var(--color-text-muted);
}

.breadcrumb a:hover {
  color: var(--color-steel);
}

.breadcrumb__current {
  color: var(--color-charcoal);
  font-weight: 500;
}

.page-header {
  padding-block: 2.5rem 2rem;
  background: linear-gradient(135deg, var(--color-charcoal) 0%, var(--color-slate) 100%);
  color: #fff;
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: var(--texture);
  opacity: 0.35;
  pointer-events: none;
}

.page-header__inner {
  position: relative;
  z-index: 1;
}

.page-header__title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 800;
  letter-spacing: 0.04em;
  color: #fff;
  margin-bottom: 0.5rem;
}

.page-header__desc {
  color: rgba(248, 250, 252, 0.65);
  max-width: 36em;
  font-size: 0.95rem;
}

/* ---------- Product detail ---------- */
.product-detail {
  padding-block: 3rem;
}

.product-detail__layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: start;
  margin-bottom: 3rem;
}

.product-gallery {
  position: sticky;
  top: calc(var(--header-h) + 1rem);
}

.product-gallery__main {
  aspect-ratio: 4 / 3;
  background: var(--color-slate);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 0.75rem;
}

.product-gallery__main img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.product-gallery__thumbs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.5rem;
}

.product-gallery__thumb {
  aspect-ratio: 1;
  border: 2px solid transparent;
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  opacity: 0.7;
  transition: border-color var(--transition), opacity var(--transition);
  padding: 0;
}

.product-gallery__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.product-gallery__thumb:hover,
.product-gallery__thumb.is-active {
  border-color: var(--color-steel);
  opacity: 1;
}

.product-info__title {
  margin-bottom: 0.75rem;
}

.product-info__summary {
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
}

.product-info__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.product-info__tag {
  display: inline-block;
  padding: 0.25rem 0.65rem;
  background: var(--color-steel-soft);
  color: var(--color-steel);
  font-size: 0.8rem;
  font-weight: 500;
  border-radius: var(--radius);
}

.specs-table {
  margin-block: 2rem;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.specs-table caption {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-align: left;
  padding: 1rem 1.25rem;
  background: var(--color-slate);
  color: #fff;
}

.specs-table th,
.specs-table td {
  padding: 0.85rem 1.25rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.925rem;
}

.specs-table th {
  width: 35%;
  background: var(--color-surface-alt);
  font-weight: 600;
  color: var(--color-slate);
}

.specs-table tr:last-child th,
.specs-table tr:last-child td {
  border-bottom: none;
}

.concerns-box {
  background: var(--color-amber-soft);
  border-left: 3px solid var(--color-amber);
  padding: 1.25rem 1.5rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin-block: 2rem;
}

.concerns-box__title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-amber-hover);
  margin-bottom: 0.75rem;
  letter-spacing: 0.03em;
}

.concerns-box ul {
  list-style: disc;
  padding-left: 1.25rem;
}

.concerns-box li {
  color: var(--color-text);
  font-size: 0.925rem;
  margin-bottom: 0.4rem;
}

.related-products {
  margin-top: 3rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--color-border);
}

/* ---------- Forms (inquiry) ---------- */
.form-group {
  margin-bottom: 1.15rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: var(--color-slate);
}

.form-label .required {
  color: var(--color-danger);
  margin-left: 2px;
}

.form-control {
  display: block;
  width: 100%;
  padding: 0.7rem 0.9rem;
  background: #fff;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-steel);
  box-shadow: 0 0 0 3px rgba(var(--rgb-steel), 0.15);
}

.form-control::placeholder {
  color: #94a3b8;
}

textarea.form-control {
  min-height: 120px;
  resize: vertical;
}

.form-hint {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 0.3rem;
}

.form-error {
  font-size: 0.8rem;
  color: var(--color-danger);
  margin-top: 0.3rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.inquiry-form {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
}

.inquiry-form__title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  margin-bottom: 0.35rem;
}

.inquiry-form__sub {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

.form-message {
  padding: 0.85rem 1rem;
  border-radius: 10px;
  margin-bottom: 0.75rem;
  font-size: 0.9rem;
  display: none;
}

.form-message.is-visible {
  display: block;
  animation: fadeIn 0.3s ease;
}

.form-message--success {
  background: #dcfce7;
  color: #166534;
  border: 1px solid #86efac;
}

.form-message--error {
  background: #fee2e2;
  color: #991b1b;
  border: 1px solid #fca5a5;
}

.form-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  margin-top: 0.5rem;
}

/* ---------- City page ---------- */
.city-page {
  padding-block: 3rem;
}

.city-page__intro {
  max-width: 48em;
  margin-bottom: 2.5rem;
}

.city-page__intro p + p {
  margin-top: 1rem;
}

.city-page__highlights {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-bottom: 3rem;
}

.city-highlight {
  padding: 1.5rem;
  background: #fff;
  border-top: 3px solid var(--color-steel);
  box-shadow: var(--shadow-sm);
}

.city-highlight__title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
  letter-spacing: 0.03em;
}

.city-highlight__desc {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.city-page__products {
  margin-bottom: 3rem;
}

.city-page__contact {
  background: var(--color-slate);
  color: #fff;
  padding: 2rem;
  border-radius: var(--radius);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1.5rem;
  align-items: center;
}

.city-page__contact-title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.03em;
}

.city-page__contact-phone {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-amber);
}

/* ---------- Utility classes ---------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.text-center {
  text-align: center;
}
.text-left {
  text-align: left;
}
.text-right {
  text-align: right;
}

.mt-0 {
  margin-top: 0;
}
.mt-1 {
  margin-top: 0.5rem;
}
.mt-2 {
  margin-top: 1rem;
}
.mt-3 {
  margin-top: 1.5rem;
}
.mt-4 {
  margin-top: 2rem;
}
.mb-0 {
  margin-bottom: 0;
}
.mb-1 {
  margin-bottom: 0.5rem;
}
.mb-2 {
  margin-bottom: 1rem;
}
.mb-3 {
  margin-bottom: 1.5rem;
}
.mb-4 {
  margin-bottom: 2rem;
}

.pt-0 {
  padding-top: 0;
}
.pb-0 {
  padding-bottom: 0;
}

.w-full {
  width: 100%;
}

.flex {
  display: flex;
}
.flex-wrap {
  flex-wrap: wrap;
}
.items-center {
  align-items: center;
}
.justify-between {
  justify-content: space-between;
}
.gap-1 {
  gap: 0.5rem;
}
.gap-2 {
  gap: 1rem;
}
.gap-3 {
  gap: 1.5rem;
}

.hidden {
  display: none !important;
}

.img-cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.divider {
  height: 1px;
  background: var(--color-border);
  border: none;
  margin-block: 2rem;
}

/* ---------- Mobile breakpoints ---------- */
@media (max-width: 1024px) {
  .product-grid,
  .solution-grid,
  .case-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .stats-strip__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.75rem;
  }

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .city-page__highlights {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --header-h: 64px;
    --gutter: 1rem;
  }

  .section {
    padding-block: 3rem;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: var(--color-charcoal);
    padding: 1rem;
    gap: 0;
    border-bottom: 1px solid rgba(var(--rgb-steel), 0.3);
    transform: translateY(-120%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition), opacity var(--transition),
      visibility var(--transition);
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    box-shadow: var(--shadow-md);
  }

  .site-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .site-nav__link {
    padding: 0.9rem 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }

  .site-nav__link::after {
    display: none;
  }

  .site-header__phone {
    display: none;
  }

  .site-header__actions .btn {
    display: none;
  }

  .hero {
    min-height: 520px;
    align-items: flex-end;
  }

  .hero__content {
    padding-block: 3rem 3.5rem;
  }

  .hero__brand {
    letter-spacing: 0.05em;
  }

  .product-detail__layout {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .product-gallery {
    position: static;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .cta-band__inner {
    flex-direction: column;
    text-align: center;
  }

  .cta-band__inner .btn-group {
    justify-content: center;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .product-grid,
  .solution-grid,
  .case-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.75rem;
  }

  .city-page__highlights {
    grid-template-columns: 1fr;
  }

  .inquiry-form {
    padding: 1.5rem;
  }
}

@media (max-width: 480px) {
  .stats-strip__grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
  }

  .btn-lg {
    padding: 0.85rem 1.35rem;
    font-size: 1rem;
  }

  .hero__cta {
    flex-direction: column;
    align-items: stretch;
  }

  .hero__cta .btn {
    width: 100%;
  }

  .product-gallery__thumbs {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .fade-up {
    opacity: 1;
    transform: none;
  }
}