/* ============================================================
   新石商贸 (Xin Shi Trade) — Global Stylesheet
   Visual language: Imerys-inspired industrial minimalism —
   generous whitespace, restrained color, large photography.
   ============================================================ */

:root {
  --color-bg: #faf9f7;
  --color-bg-alt: #f0eee9;
  --color-ink: #1c1c1a;
  --color-ink-soft: #5a584f;
  --color-line: #ddd9d0;
  --color-accent: #9b2226;       /* brand red, taken from company brochure */
  --color-accent-dark: #7a1a1d;
  --color-white: #ffffff;

  --font-sans: "Helvetica Neue", "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;

  --container-max: 1280px;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 7rem;

  --transition: 0.35s cubic-bezier(0.25, 0.1, 0.25, 1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-ink);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

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

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* ---------------- Header / Navigation ---------------- */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem var(--space-md);
  background: rgba(250, 249, 247, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-line);
  transition: background var(--transition);
}

.site-header .logo img {
  height: 42px;
  width: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-ink);
  padding-bottom: 4px;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), color var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  border-bottom-color: var(--color-accent);
  color: var(--color-accent-dark);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.nav-toggle span {
  width: 26px;
  height: 2px;
  background: var(--color-ink);
}

/* ---------------- Hero (video) ---------------- */

.hero-video {
  position: relative;
  height: 100vh;
  min-height: 560px;
  width: 100%;
  overflow: hidden;
  background: #0c0c0c;
}

.hero-video video {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: translate(-50%, -50%);
}

.hero-video::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.35) 0%, rgba(0, 0, 0, 0.15) 45%, rgba(0, 0, 0, 0.55) 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 0 var(--space-md);
  color: var(--color-white);
}

.hero-eyebrow {
  font-size: 0.85rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  opacity: 0.85;
  margin-bottom: var(--space-md);
}

.hero-title {
  font-size: clamp(1.9rem, 4.6vw, 3.6rem);
  font-weight: 700;
  letter-spacing: 0.01em;
  max-width: 18ch;
  margin: 0;
  line-height: 1.4;
}

.hero-motto {
  margin: var(--space-lg) 0 0;
  font-size: clamp(0.95rem, 1.4vw, 1.25rem);
  letter-spacing: 0.22em;
  font-weight: 200;
  color: #f1d9da;
  position: relative;
  padding-top: var(--space-md);
}

.hero-motto::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  transform: none;
  width: 64px;
  height: 1px;
  background: rgba(255, 255, 255, 0.4);
}

.hero-scroll {
  position: absolute;
  bottom: var(--space-md);
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  color: var(--color-white);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  opacity: 0.8;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.hero-scroll::after {
  content: "";
  width: 1px;
  height: 28px;
  background: rgba(255, 255, 255, 0.6);
  animation: scrollPulse 1.8s ease-in-out infinite;
}

@keyframes scrollPulse {
  0% { transform: scaleY(0.2); opacity: 0.3; transform-origin: top; }
  50% { transform: scaleY(1); opacity: 1; transform-origin: top; }
  100% { transform: scaleY(0.2); opacity: 0.3; transform-origin: bottom; }
}

.hero-badge {
  display: inline-block;
  background: var(--color-accent);
  color: var(--color-white);
  padding: 0.55rem 1.5rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  margin-bottom: var(--space-md);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

/* ---------------- Scroll reveal ---------------- */

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s cubic-bezier(0.25, 0.1, 0.25, 1), transform 0.8s cubic-bezier(0.25, 0.1, 0.25, 1);
}

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

.reveal-stagger.is-visible > * {
  animation: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ---------------- Section scaffolding ---------------- */

section {
  padding: var(--space-xl) 0;
}

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

.section-head {
  max-width: 760px;
  margin: 0 auto var(--space-lg);
  text-align: center;
}

.section-eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.section-title {
  font-size: clamp(1.5rem, 2.6vw, 2.3rem);
  font-weight: 600;
  margin: 0 0 var(--space-sm);
  letter-spacing: 0.01em;
}

.section-desc {
  color: var(--color-ink-soft);
  font-size: 1.02rem;
}

/* ---------------- About / Strength split ---------------- */

.split-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  align-items: center;
}

.split-row.reverse .split-media {
  order: 2;
}

.split-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 4 / 3;
}

.split-text h3 {
  font-size: 1.6rem;
  font-weight: 600;
  margin: 0 0 var(--space-sm);
}

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

.stat-row {
  display: flex;
  gap: var(--space-lg);
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-line);
}

.stat-row .stat-num {
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--color-accent-dark);
  display: block;
}

.stat-row .stat-label {
  font-size: 0.85rem;
  color: var(--color-ink-soft);
  letter-spacing: 0.04em;
}

/* ---------------- Resource stat band ---------------- */

.resource-band {
  background: #14141a;
  color: var(--color-white);
  padding: var(--space-lg) var(--space-md);
  margin: var(--space-lg) 0 0;
  border-radius: 4px;
}

.resource-band-inner {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-xl);
  flex-wrap: wrap;
  text-align: center;
}

.resource-item {
  padding: 0 var(--space-md);
  position: relative;
}

.resource-item + .resource-item {
  border-left: 1px solid rgba(255, 255, 255, 0.18);
}

.resource-item .resource-num {
  display: block;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--color-white);
}

.resource-item .resource-num span {
  color: #e7a6a8;
  font-weight: 500;
  font-size: 0.55em;
  margin-left: 0.4em;
}

.resource-item .resource-label {
  display: block;
  margin-top: 0.6rem;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #9a988f;
}

/* ---------------- Service pillars ---------------- */

.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.service-card {
  background: var(--color-white);
  border: 1px solid var(--color-line);
  padding: var(--space-md) var(--space-md) var(--space-lg);
  text-align: left;
  transition: box-shadow var(--transition), transform var(--transition);
}

.service-card:hover {
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.07);
  transform: translateY(-3px);
}

.service-icon {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-line);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--color-accent-dark);
  margin-bottom: var(--space-sm);
}

.service-card h4 {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0 0 0.6rem;
  color: var(--color-ink);
}

.service-card p {
  color: var(--color-ink-soft);
  font-size: 0.92rem;
  margin: 0;
}

/* ---------------- Coverage map / logistics ---------------- */

.coverage-section {
  background: #14141a;
  padding: 4rem 0;
}

.coverage-panel {
  background: #14141a;
  color: var(--color-white);
  border-radius: 4px;
  padding: var(--space-lg);
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: var(--space-lg);
  align-items: center;
}

.coverage-panel .section-eyebrow {
  color: #8fb8ff;
}

.coverage-panel h3 {
  font-size: 1.6rem;
  margin: 0 0 var(--space-sm);
  font-weight: 600;
}

.coverage-panel p {
  color: #c7c6c2;
}

.region-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: var(--space-md);
}

.region-tags span {
  border: 1px solid rgba(255, 255, 255, 0.25);
  padding: 0.4rem 0.9rem;
  font-size: 0.85rem;
  border-radius: 999px;
  letter-spacing: 0.02em;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
}

.region-tags span:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.resource-item {
  transition: transform var(--transition);
}

.resource-item:hover {
  transform: translateY(-4px);
}

.coverage-media {
  aspect-ratio: 4 / 3;
  overflow: hidden;
  border-radius: 4px;
}

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

/* ---------------- CTA banner ---------------- */

.cta-banner {
  text-align: center;
  padding: var(--space-lg) var(--space-md);
}

.cta-banner.is-poster {
  position: relative;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  padding: var(--space-xl) var(--space-md);
  color: var(--color-white);
  z-index: 1;
  text-align: left;
}

.cta-banner.is-poster::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(20, 20, 26, 0.75); /* 深色高级灰遮罩 */
  z-index: -1;
}

.cta-banner.is-poster .section-eyebrow {
  color: #e7a6a8;
}

.cta-banner.is-poster .section-title,
.cta-banner.is-poster .section-desc {
  color: var(--color-white) !important;
}

.has-video-bg {
  position: relative;
  overflow: hidden;
  padding: 6rem 2rem;
  text-align: left;
}

.has-video-bg .bg-video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}

.has-video-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(20, 20, 26, 0.7); /* 深色遮罩 */
  z-index: 1;
}

.has-video-bg .section-eyebrow {
  color: #e7a6a8;
  position: relative;
  z-index: 2;
}

.btn {
  display: inline-block;
  padding: 0.95rem 2.4rem;
  border: 1px solid var(--color-ink);
  font-size: 0.9rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: background var(--transition), color var(--transition);
}

.btn:hover {
  background: var(--color-ink);
  color: var(--color-white);
}

.btn-accent {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: var(--color-white);
}

.btn-accent:hover {
  background: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
}

/* ---------------- Contact section (B2B inquiry form) ---------------- */

.contact-section {
  background: #14141a;
  color: #c7c6c2;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-xl);
  align-items: start;
}

.contact-info .section-eyebrow {
  color: #e7a6a8;
}

.contact-info .section-title {
  color: var(--color-white);
}

.contact-info .section-desc {
  color: #9a988f;
}

.contact-person-card {
  margin-top: var(--space-lg);
  padding: var(--space-md);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-left: 3px solid var(--color-accent);
  background: rgba(255, 255, 255, 0.03);
  display: flex;
  flex-direction: row !important; /* 强制横向排版 */
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.contact-person-info {
  flex: 1;
  min-width: 0;
}

.contact-qr-code {
  width: 85px;
  height: 85px;
  flex-shrink: 0; /* 核心：防止二维码在窄屏被压缩或换行 */
  object-fit: contain;
  background: var(--color-white);
  border: 2px solid var(--color-accent);
  border-radius: 4px;
  padding: 4px;
}

.contact-person-label {
  display: block;
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: #9a988f;
  margin-bottom: 0.4rem;
}

.contact-person-name {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 0.04em;
}

.contact-phone-list {
  list-style: none;
  padding: 0;
  margin: var(--space-md) 0 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.contact-phone-list li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-top: 0.75rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.contact-phone-list li:first-child {
  border-top: none;
  padding-top: 0;
}

.contact-phone-list span {
  font-size: 0.82rem;
  color: #9a988f;
  letter-spacing: 0.02em;
}

.contact-phone-list a {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 0.02em;
  white-space: nowrap;
  transition: color var(--transition);
}

.contact-phone-list a:hover {
  color: #e7a6a8;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.12);
  padding: var(--space-lg);
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-row label {
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: #c7c6c2;
}

.form-row .required {
  color: var(--color-accent);
}

.form-row input,
.form-row select,
.form-row textarea {
  width: 100%;
  background: transparent;
  border: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.25);
  padding: 0.65rem 0.2rem;
  font-size: 0.98rem;
  font-family: inherit;
  color: var(--color-white);
  transition: border-color var(--transition);
  resize: vertical;
}

.form-row select {
  appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, #c7c6c2 50%), linear-gradient(135deg, #c7c6c2 50%, transparent 50%);
  background-position: calc(100% - 8px) center, calc(100% - 3px) center;
  background-size: 6px 6px, 6px 6px;
  background-repeat: no-repeat;
}

.form-row select option {
  color: var(--color-ink);
}

.form-row input::placeholder,
.form-row textarea::placeholder {
  color: #6f6e66;
}

.form-row input:focus,
.form-row select:focus,
.form-row textarea:focus {
  outline: none;
  border-bottom-color: var(--color-accent);
}

.form-submit {
  align-self: flex-start;
  margin-top: var(--space-xs);
  border: none;
}

/* ---------------- Footer ---------------- */

.site-footer {
  background: #14141a;
  color: #c7c6c2;
  padding: var(--space-lg) 0 var(--space-md);
  font-size: 0.92rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: var(--space-lg);
}

.footer-grid h4 {
  color: var(--color-white);
  font-weight: 600;
  letter-spacing: 0.05em;
  margin: 0 0 var(--space-sm);
  text-transform: uppercase;
  font-size: 0.85rem;
}

.footer-grid p,
.footer-grid li {
  color: #9a988f;
  margin: 0 0 0.5rem;
}

.footer-contact-person {
  color: var(--color-white) !important;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.footer-grid ul {
  list-style: none;
  padding: 0;
}

.footer-motto {
  margin-top: var(--space-md);
  padding: var(--space-md) var(--space-md) 0;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  font-size: 1rem;
  letter-spacing: 0.04em;
  color: #d8d6cd;
  font-style: italic;
}

.footer-bottom {
  margin-top: var(--space-sm);
  text-align: center;
  font-size: 0.8rem;
  color: #6f6e66;
}

/* ============================================================
   Products page
   ============================================================ */

.page-hero {
  padding: 9.5rem var(--space-md) var(--space-xl);
  text-align: center;
  background: var(--color-bg-alt);
}

.page-hero-title {
  max-width: 880px;
  margin: 0 auto;
  font-size: clamp(1.4rem, 3vw, 2.1rem);
  font-weight: 600;
  line-height: 1.6;
  letter-spacing: 0.01em;
}

.page-hero-title::before {
  content: "";
  display: block;
  width: 56px;
  height: 3px;
  background: var(--color-accent);
  margin: 0 auto var(--space-md);
}

.page-hero-sub {
  max-width: 640px;
  margin: var(--space-md) auto 0;
  color: var(--color-ink-soft);
  font-size: 1.02rem;
}

/* ---------------- Application scenarios ---------------- */

.scenario-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.scenario-card {
  background: var(--color-white);
  border: 1px solid var(--color-line);
  border-top: 3px solid var(--color-accent);
  padding: var(--space-lg) var(--space-md);
}

.scenario-card .scenario-index {
  display: inline-block;
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.scenario-card h3 {
  font-size: 1.45rem;
  font-weight: 700;
  margin: 0 0 var(--space-sm);
  color: var(--color-ink);
}

.scenario-card p {
  color: var(--color-ink-soft);
  font-size: 0.96rem;
  margin: 0;
}

/* ---------------- Product grid ---------------- */

.product-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg) var(--space-md);
}

.product-card {
  background: var(--color-white);
  border: 1px solid var(--color-line);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--transition), transform var(--transition);
}

.product-card:hover {
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.08);
  transform: translateY(-3px);
}

.product-card .card-media {
  position: relative;
  overflow: hidden;
  background: var(--color-bg-alt);
}

.product-card .card-media img {
  width: 100%;
  height: auto;
  transition: transform 0.6s ease;
}

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

.card-index {
  position: absolute;
  top: var(--space-sm);
  left: var(--space-sm);
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.92);
  color: var(--color-accent-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
}

.card-body {
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  flex: 1;
}

.card-body h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin: 0;
  color: var(--color-accent-dark);
}

.card-body .card-tag {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
}

.card-body .card-desc {
  color: var(--color-ink-soft);
  font-size: 0.95rem;
  margin: 0;
}

/* ---------------- Chemical data cards (replaces plain tables) ---------------- */

.chem-card {
  margin-top: var(--space-xs);
  padding-top: var(--space-sm);
  border-top: 1px solid var(--color-line);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-md);
  align-items: start;
}

.chem-caption {
  grid-column: 1 / -1;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
  margin: 0 0 0.2rem;
}

.chem-bars {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.chem-bar-row {
  display: grid;
  grid-template-columns: 92px 1fr 44px;
  align-items: center;
  gap: 0.6rem;
}

.chem-bar-row.is-key .chem-label,
.chem-bar-row.is-key .chem-val {
  color: var(--color-accent-dark);
  font-weight: 700;
}

.chem-label {
  font-size: 0.78rem;
  color: var(--color-ink-soft);
  letter-spacing: 0.01em;
}

.chem-bar-track {
  position: relative;
  height: 7px;
  border-radius: 999px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-line);
  overflow: hidden;
}

.chem-bar-fill {
  position: absolute;
  inset: 0;
  width: 0;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);
  transition: width 1.1s cubic-bezier(0.25, 0.1, 0.25, 1);
}

.chem-bar-row.is-key .chem-bar-fill {
  background: linear-gradient(90deg, #c93f43 0%, var(--color-accent-dark) 100%);
}

.is-visible .chem-bar-fill {
  width: var(--val, 0%);
}

.chem-val {
  font-size: 0.85rem;
  font-weight: 600;
  text-align: right;
  font-variant-numeric: tabular-nums;
  color: var(--color-ink);
}

.chem-whiteness {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  flex: 0 0 auto;
}

.chem-whiteness-ring {
  --p: 0;
  width: 92px;
  height: 92px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: conic-gradient(var(--color-bg-alt) 0 100%);
  position: relative;
  transition: background 1.2s cubic-bezier(0.25, 0.1, 0.25, 1);
}

.is-visible .chem-whiteness-ring {
  background: conic-gradient(var(--color-accent) calc(var(--p) * 1%), var(--color-bg-alt) 0);
}

.chem-whiteness-ring::before {
  content: "";
  position: absolute;
  inset: 7px;
  border-radius: 50%;
  background: var(--color-white);
}

.chem-whiteness-ring span {
  position: relative;
  z-index: 1;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-accent-dark);
}

.chem-whiteness small {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--color-ink-soft);
  max-width: 9ch;
}

/* ---------------- Video gallery ---------------- */

.video-gallery {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.video-card {
  background: #14141a;
  border-radius: 4px;
  overflow: hidden;
}

.video-card video {
  width: 100%;
  max-height: 75vh;
  object-fit: contain;
  background: #000;
}

.video-caption {
  padding: var(--space-sm) var(--space-md);
  color: #c7c6c2;
  font-size: 0.88rem;
  letter-spacing: 0.03em;
}

/* ---------------- Video carousel (products page) ---------------- */

.video-carousel {
  display: flex;
  gap: var(--space-md);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scroll-snap-type: x proximity;
  padding: 0 0 var(--space-sm);
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.video-carousel::-webkit-scrollbar {
  display: none;
  height: 0;
}

.video-carousel-item {
  flex: 0 0 auto;
  flex-shrink: 0;
  width: min(380px, 78vw);
  scroll-snap-align: start;
}

.video-carousel-item .video-card {
  height: 100%;
}

.carousel-cta {
  text-align: center;
  margin-top: var(--space-lg);
}

/* ---------------- Full gallery wall (gallery.html) ---------------- */

.full-gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-md);
}

.gallery-tag {
  display: inline-block;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.3rem;
}

/* ============================================================
   Responsive
   ============================================================ */

@media (max-width: 980px) {
  .split-row,
  .coverage-panel,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .contact-form {
    padding: var(--space-md);
  }

  .split-row.reverse .split-media {
    order: 0;
  }

  .product-grid,
  .service-grid,
  .scenario-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .resource-band-inner {
    gap: var(--space-md);
  }

  .resource-item {
    flex: 1 1 220px;
  }

  .resource-item + .resource-item {
    border-left: none;
    border-top: 1px solid rgba(255, 255, 255, 0.18);
    padding-top: var(--space-md);
  }
}

@media (max-width: 760px) {
  .nav-links {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-md);
    border-bottom: 1px solid var(--color-line);
    transform: translateY(-110%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition), opacity var(--transition);
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-title {
    max-width: 22ch;
  }

  .video-gallery,
  .full-gallery-grid {
    grid-template-columns: 1fr;
  }

  .video-carousel-item {
    width: min(320px, 82vw);
  }

  .coverage-panel {
    background: transparent;
    padding: 0;
    border-radius: 0;
  }

  .coverage-media {
    border-radius: 0;
  }

  .coverage-media img {
    width: 100vw;
    max-width: 100vw;
    margin-left: calc(-50vw + 50%);
  }

  .stat-row {
    flex-wrap: wrap;
    gap: var(--space-md);
  }

  section {
    padding: var(--space-lg) 0;
  }

  .page-hero {
    padding-top: 7.5rem;
  }

  .page-hero-title {
    font-size: clamp(1.1rem, 5vw, 1.6rem);
    line-height: 1.5;
  }

  .cta-banner.is-poster {
    padding: 5rem 2rem;
  }

  .contact-phone-list li {
    flex-wrap: wrap;
    gap: 0.2rem;
  }

  .contact-phone-list a {
    font-size: 1rem;
  }

  .chem-card {
    grid-template-columns: 1fr;
  }

  .chem-whiteness {
    flex-direction: row;
    justify-content: flex-start;
    gap: var(--space-sm);
    text-align: left;
  }

  .chem-whiteness small {
    max-width: none;
    margin-top: 0;
  }

  .hero-motto {
    letter-spacing: 0.1em;
  }

  .contact-qr-code {
    width: 70px;
    height: 70px;
  }

  .contact-phone-list a {
    white-space: nowrap !important;
    font-size: 1.05rem;
  }

  .contact-phone-list span {
    white-space: nowrap;
    margin-right: 10px;
  }
}

.minimal-scroll-indicator {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  width: 1px;
  height: 50px;
  background: rgba(255, 255, 255, 0.2);
  z-index: 10;
  overflow: hidden;
}
.minimal-scroll-indicator::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 15px;
  background: #ffffff;
  animation: scrollDrop 1.8s cubic-bezier(0.77, 0, 0.175, 1) infinite;
}
@keyframes scrollDrop {
  0% { transform: translateY(-100%); opacity: 0; }
  20% { opacity: 1; }
  80% { opacity: 1; }
  100% { transform: translateY(350%); opacity: 0; }
}