/* D9S Global Service — marketing site
   Brand tokens locked to the live site. Do not change the hex values. */

:root {
  --navy: #001A31;
  --navy-mid: #0A2540;
  --navy-light: #143552;
  --green: #0B6E3E;
  --green-bright: #00A86B;
  --blue: #1A5FB4;
  --yellow: #E8B923;
  --bg: #F2F3F5;
  --bg-card: #FFFFFF;
  --text: #0D1B2A;
  --text-muted: #5C6B7A;
  --border: #E2E5E9;
  --header-bg: #D1D2D4;
  --header-border: #C5C6C8;
  --shadow: 0 4px 24px rgba(0, 26, 49, 0.08);
  --radius: 12px;
  --font: "Inter", system-ui, -apple-system, sans-serif;
  --header-h: 4.25rem;
  --focus: 0 0 0 3px #ffffff, 0 0 0 6px var(--navy);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 0.5rem);
}

@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;
  }
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

img,
video {
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
}

:focus {
  outline: none;
}

:focus-visible {
  outline: 3px solid var(--navy);
  outline-offset: 3px;
}

.btn:focus-visible,
.lang-btn:focus-visible,
.menu-toggle:focus-visible {
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -100%;
  z-index: 2000;
  background: var(--navy);
  color: #fff;
  padding: 0.6rem 1rem;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
}

.skip-link:focus,
.skip-link:focus-visible {
  top: 0.75rem;
  outline-color: #fff;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--header-bg);
  border-bottom: 1px solid var(--header-border);
}

.site-header.is-scrolled {
  box-shadow: 0 2px 12px rgba(0, 26, 49, 0.1);
}

.header-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0.7rem 1.5rem;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.logo-link {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  text-decoration: none;
}

.logo-img {
  height: 42px;
  width: auto;
  display: block;
}

.site-nav {
  display: flex;
  align-items: center;
  margin-left: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.6rem;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text);
  font-weight: 500;
  font-size: 0.95rem;
}

.nav-links a:hover {
  color: var(--green);
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-left: 0.25rem;
}

.lang-switch {
  display: flex;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.lang-btn {
  padding: 0.35rem 0.65rem;
  border: none;
  background: transparent;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  line-height: 1.2;
}

.lang-btn:hover {
  color: var(--navy);
  background: #eef0f2;
}

.lang-btn[aria-pressed="true"] {
  background: var(--navy);
  color: #fff;
}

.lang-btn[aria-pressed="true"]:hover {
  background: var(--navy-mid);
  color: #fff;
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--header-border);
  border-radius: 8px;
  background: var(--bg-card);
  color: var(--navy);
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

.menu-toggle svg {
  display: block;
}

.menu-toggle .icon-close {
  display: none;
}

.menu-toggle[aria-expanded="true"] .icon-open {
  display: none;
}

.menu-toggle[aria-expanded="true"] .icon-close {
  display: block;
}

/* Hero */
.hero {
  padding: 3.5rem 1.5rem 4rem;
  background: linear-gradient(165deg, #f2f3f5 0%, #e8ecf0 50%, #f0f4f2 100%);
}

.hero-content {
  max-width: 1120px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 3rem;
  align-items: center;
}

.hero-text h1 {
  font-size: clamp(2rem, 4.4vw, 3.15rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--navy);
  margin-bottom: 1.15rem;
}

.hero-text h1 .accent {
  background: linear-gradient(90deg, var(--green), var(--blue));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

@supports not (background-clip: text) {
  .hero-text h1 .accent {
    color: var(--green);
  }
}

.hero-text .lead {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 1.75rem;
  max-width: 36rem;
}

.cta-group {
  display: flex;
  gap: 0.85rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.6rem;
  border-radius: 8px;
  font-family: inherit;
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  cursor: pointer;
  border: 2px solid transparent;
  transition: background 0.2s, color 0.2s, border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}

.btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
}

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

.btn-primary:hover:not(:disabled) {
  background: var(--navy-mid);
  border-color: var(--navy-mid);
  box-shadow: 0 8px 20px rgba(0, 26, 49, 0.22);
}

@media (hover: hover) {
  .btn-primary:hover:not(:disabled) {
    transform: translateY(-1px);
  }
}

.btn-secondary {
  background: transparent;
  color: var(--navy);
  border-color: var(--navy);
}

.btn-secondary:hover {
  background: var(--navy);
  color: #fff;
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.logo-video-wrap {
  position: relative;
  width: 100%;
  max-width: 360px;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 26, 49, 0.12);
  background: #edeeef;
}

.logo-video-wrap video,
.logo-video-wrap img {
  width: 100%;
  display: block;
  aspect-ratio: 464 / 688;
  object-fit: cover;
}

.glow-ring {
  position: absolute;
  inset: -20px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 168, 107, 0.15) 0%, transparent 70%);
  pointer-events: none;
  animation: pulse 4s ease-in-out infinite;
  z-index: 0;
}

.logo-video-wrap video,
.logo-video-wrap img {
  position: relative;
  z-index: 1;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 0.6;
    transform: scale(1);
  }
  50% {
    opacity: 1;
    transform: scale(1.05);
  }
}

/* Sections */
.section {
  padding: 4.5rem 1.5rem;
}

.section-inner {
  max-width: 1120px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 2.75rem;
}

.section-header h2 {
  font-size: clamp(1.7rem, 3.5vw, 2.35rem);
  font-weight: 800;
  color: var(--navy);
  margin-bottom: 0.65rem;
  letter-spacing: -0.02em;
}

.section-header p {
  color: var(--text-muted);
  font-size: 1.08rem;
  max-width: 36rem;
  margin: 0 auto;
}

.services {
  background: var(--bg-card);
}

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

.service-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem 1.5rem;
  position: relative;
  overflow: hidden;
  height: 100%;
}

.service-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, var(--green), var(--blue));
  opacity: 0;
  transition: opacity 0.25s;
}

@media (hover: hover) {
  .service-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
  }

  .service-card:hover::before {
    opacity: 1;
  }
}

.service-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-mid) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.15rem;
  color: #fff;
}

.service-icon svg {
  width: 22px;
  height: 22px;
  display: block;
}

.service-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 0.65rem;
  line-height: 1.35;
}

.service-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.approach {
  background: var(--bg);
}

.approach-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.approach-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.35rem;
}

.approach-list li {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.approach-list .num {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--navy);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  margin-top: 0.1rem;
}

.approach-list h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.2rem;
  color: var(--navy);
}

.approach-list p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.approach-visual {
  background: linear-gradient(145deg, var(--navy) 0%, var(--navy-mid) 100%);
  border-radius: 20px;
  padding: 2.35rem;
  color: #fff;
  min-height: 300px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.approach-visual h3 {
  font-size: 1.4rem;
  line-height: 1.3;
  margin-bottom: 0.85rem;
}

.approach-visual p {
  color: rgba(255, 255, 255, 0.88);
  margin-bottom: 1.5rem;
}

.stat-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.stat {
  text-align: center;
}

.stat strong {
  display: block;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--yellow);
  letter-spacing: -0.02em;
}

.stat span {
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.82);
}

.cases {
  background: var(--bg);
}

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

.case-card {
  background: var(--bg-card);
  border-radius: 16px;
  border: 1px solid var(--border);
  box-shadow: 0 8px 30px rgba(0, 26, 49, 0.08);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.case-card-top {
  background: var(--navy);
  color: #fff;
  padding: 1.6rem 1.65rem 1.4rem;
}

.case-label {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--yellow);
  background: rgba(232, 185, 35, 0.16);
  padding: 0.28rem 0.7rem;
  border-radius: 20px;
  margin-bottom: 0.9rem;
}

.case-card-top h3 {
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.35;
  margin: 0 0 0.5rem;
  color: #fff;
}

.case-client {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.72);
}

.case-card-content {
  padding: 1.6rem 1.65rem 1.75rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
}

.case-block strong {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--navy);
  margin-bottom: 0.35rem;
}

.case-block p {
  font-size: 0.92rem;
  line-height: 1.55;
  color: var(--text-muted);
}

.case-block.result {
  background: #f0f7f3;
  border-left: 4px solid var(--green);
  padding: 1rem 1.1rem;
  border-radius: 0 8px 8px 0;
  margin-top: auto;
}

.case-block.result strong {
  color: var(--green);
}

.case-block.result p {
  color: var(--text);
  font-weight: 500;
}

.contact {
  background: var(--bg-card);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: start;
}

.contact-info h3 {
  font-size: 1.35rem;
  color: var(--navy);
  line-height: 1.35;
  margin-bottom: 0.85rem;
}

.contact-info > p {
  color: var(--text-muted);
  margin-bottom: 1.4rem;
}

.contact-details {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.contact-details li {
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
  color: var(--text);
  font-size: 0.95rem;
}

.contact-details svg {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  margin-top: 0.15rem;
  color: var(--green);
}

.contact-form {
  background: var(--bg);
  padding: 1.75rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.form-group {
  margin-bottom: 1.1rem;
}

.form-group label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.35rem;
  color: var(--navy);
}

.optional {
  font-weight: 500;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.72rem 0.95rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: inherit;
  font-size: 1rem;
  background: #fff;
  color: var(--text);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus-visible,
.form-group textarea:focus-visible,
.form-group select:focus-visible {
  outline: none;
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(11, 110, 62, 0.2);
}

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

.form-group.is-invalid input,
.form-group.is-invalid textarea,
.form-group.is-invalid select {
  border-color: #9b1c1c;
}

.field-error {
  display: none;
  margin-top: 0.35rem;
  font-size: 0.82rem;
  color: #9b1c1c;
}

.form-group.is-invalid .field-error {
  display: block;
}

.form-note {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.9rem;
}

.hp-field {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.form-banner-error {
  background: #fdecec;
  border: 1px solid #e8b4b4;
  color: #9b1c1c;
  border-radius: 8px;
  padding: 0.75rem 0.9rem;
  font-size: 0.9rem;
  margin-bottom: 1.1rem;
}

.form-banner-error[hidden] {
  display: none;
}

.form-actions {
  margin-top: 0.25rem;
}

.form-success {
  display: none;
  background: #f0f7f3;
  border: 1px solid #c5e3d2;
  border-radius: var(--radius);
  padding: 1.5rem;
}

.form-success.is-visible {
  display: block;
}

.contact-form.is-success .form-fields {
  display: none;
}

.form-success h3 {
  color: var(--green);
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
}

.form-success p {
  color: var(--text);
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
}

.form-success .form-note {
  margin-top: 0;
}

/* Footer */
.site-footer {
  background: var(--navy);
  color: #fff;
  padding: 2.5rem 1.5rem 1.75rem;
}

.footer-inner {
  max-width: 1120px;
  margin: 0 auto;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.25rem;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.footer-brand img {
  height: 36px;
  width: auto;
  border-radius: 4px;
  display: block;
}

.footer-brand span {
  font-weight: 600;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  list-style: none;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.78);
  text-decoration: none;
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: #fff;
}

.footer-copy {
  margin-top: 1.75rem;
  padding-top: 1.35rem;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  text-align: center;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.62);
}

.footer-copy p + p {
  margin-top: 0.35rem;
}

/* Responsive */
@media (max-width: 900px) {
  .hero-content,
  .services-grid,
  .approach-grid,
  .cases-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .hero-content {
    gap: 2rem;
  }

  .logo-video-wrap {
    max-width: 260px;
  }

  .hero-visual {
    order: 1;
  }

  .stat-row {
    gap: 0.75rem;
  }

  .menu-toggle {
    display: inline-flex;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin: 0;
    background: var(--header-bg);
    border-bottom: 1px solid var(--header-border);
    padding: 0.75rem 1.5rem 1.25rem;
    box-shadow: 0 12px 24px rgba(0, 26, 49, 0.12);
  }

  .site-nav.is-open {
    display: block;
  }

  .nav-links {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-links a {
    display: block;
    padding: 0.85rem 0.15rem;
    font-size: 1.05rem;
    border-bottom: 1px solid var(--header-border);
  }

  .header-inner {
    position: relative;
    justify-content: flex-start;
  }

  .header-tools {
    margin-left: auto;
  }

  body.nav-open {
    overflow: hidden;
  }
}

@media (max-width: 640px) {
  .header-inner {
    padding: 0.65rem 1rem;
  }

  .section,
  .hero {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .section {
    padding-top: 3.25rem;
    padding-bottom: 3.25rem;
  }

  .hero {
    padding-top: 2.25rem;
    padding-bottom: 2.75rem;
  }

  .logo-img {
    height: 36px;
  }

  .lang-btn {
    padding: 0.32rem 0.5rem;
    font-size: 0.72rem;
  }

  .cta-group {
    flex-direction: column;
  }

  .cta-group .btn {
    width: 100%;
  }

  .stat-row {
    grid-template-columns: 1fr;
    text-align: left;
  }

  .stat {
    text-align: left;
    display: flex;
    align-items: baseline;
    gap: 0.6rem;
  }

  .approach-visual,
  .contact-form {
    padding: 1.4rem;
  }
}

@media (max-width: 400px) {
  .lang-btn[data-lang="zh"] {
    letter-spacing: 0;
  }
}