/* ============================================
   Yixi Technology - Global Styles
   ============================================ */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,100..1000;1,9..40,100..1000&family=Noto+Sans+SC:wght@300;400;500;700;900&family=Outfit:wght@300;400;500;600;700;800&display=swap');

/* ── CSS Variables ── */
:root {
  --color-primary: #0a1f44;
  --color-primary-light: #1a3a6c;
  --color-accent: #2b7cff;
  --color-accent-glow: #4d9fff;
  --color-gold: #c8a44e;
  --color-gold-light: #e6c76e;
  --color-bg: #ffffff;
  --color-bg-alt: #f4f6fa;
  --color-bg-dark: #0a1f44;
  --color-text: #1a1a2e;
  --color-text-light: #5a6070;
  --color-text-muted: #8a8f9d;
  --color-border: #e2e5ec;
  --color-border-light: #f0f1f5;
  --font-cn: 'Noto Sans SC', sans-serif;
  --font-en: 'Outfit', 'DM Sans', sans-serif;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --shadow-sm: 0 2px 8px rgba(10,31,68,0.06);
  --shadow-md: 0 4px 20px rgba(10,31,68,0.08);
  --shadow-lg: 0 8px 40px rgba(10,31,68,0.12);
  --shadow-xl: 0 16px 60px rgba(10,31,68,0.16);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
  --nav-height: 72px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-cn);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  overflow-x: hidden;
}

body.en {
  font-family: var(--font-en);
}

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

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

ul, ol { list-style: none; }

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

/* ── Typography ── */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.3;
  font-weight: 700;
}

h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.25rem); }
h3 { font-size: clamp(1.1rem, 2.5vw, 1.4rem); }
h4 { font-size: 1.1rem; }

p {
  color: var(--color-text-light);
  line-height: 1.85;
  font-size: 0.95rem;
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 14px;
}

.section-title {
  margin-bottom: 16px;
  color: var(--color-primary);
}

.section-desc {
  max-width: 600px;
  margin: 0 auto 48px;
}

/* ── Layout ── */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 100px 0;
}

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

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  transition: var(--transition);
  white-space: nowrap;
}

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

.btn-primary:hover {
  background: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  border: 2px solid var(--color-border);
  color: var(--color-primary);
}

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

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

.btn-white:hover {
  background: var(--color-gold);
  color: #fff;
  transform: translateY(-2px);
}

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

.btn-gold:hover {
  background: var(--color-gold-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* ── Navigation ── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  transition: var(--transition);
  background: transparent;
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow-sm);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-en);
  font-weight: 700;
  font-size: 1.2rem;
  color: #fff;
}

.navbar.scrolled .nav-logo {
  color: var(--color-primary);
}

.nav-logo img {
  height: 40px;
  width: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.85);
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: #fff;
}

.navbar.scrolled .nav-links a {
  color: var(--color-text-light);
}

.navbar.scrolled .nav-links a:hover,
.navbar.scrolled .nav-links a.active {
  color: var(--color-accent);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: var(--transition);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.lang-switch {
  display: flex;
  align-items: center;
  background: rgba(255,255,255,0.15);
  border-radius: 20px;
  padding: 4px;
  backdrop-filter: blur(10px);
}

.navbar.scrolled .lang-switch {
  background: var(--color-bg-alt);
}

.lang-switch a {
  padding: 6px 14px;
  border-radius: 16px;
  font-size: 0.8rem;
  font-weight: 600;
  color: rgba(255,255,255,0.7);
  transition: var(--transition);
}

.lang-switch a:hover {
  color: #fff;
}

.lang-switch a.active {
  background: var(--color-accent);
  color: #fff;
}

.navbar.scrolled .lang-switch a {
  color: var(--color-text-muted);
}

.navbar.scrolled .lang-switch a.active {
  color: #fff;
}

/* Mobile Menu */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: #fff;
  transition: var(--transition);
  border-radius: 2px;
}

.navbar.scrolled .nav-toggle span {
  background: var(--color-primary);
}

.nav-toggle.open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.open span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ── Hero ── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, #0a1f44 0%, #1a3a6c 50%, #0d2847 100%);
  overflow: hidden;
  padding-top: var(--nav-height);
}

.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(43,124,255,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(43,124,255,0.05) 1px, transparent 1px);
  background-size: 60px 60px;
}

.hero-bg-glow {
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(43,124,255,0.15) 0%, transparent 70%);
  top: 50%;
  right: -10%;
  transform: translateY(-50%);
}

.hero-bg-glow-2 {
  position: absolute;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(200,164,78,0.1) 0%, transparent 70%);
  bottom: -10%;
  left: 10%;
}

.hero .container {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-content {
  color: #fff;
}

.hero-content .section-label {
  color: var(--color-accent-glow);
}

.hero-content h1 {
  color: #fff;
  margin-bottom: 24px;
  font-weight: 800;
}

.hero-content p {
  color: rgba(255,255,255,0.7);
  font-size: 1.05rem;
  margin-bottom: 36px;
  max-width: 520px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

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

.hero-image-placeholder {
  width: 100%;
  max-width: 480px;
  aspect-ratio: 1;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(43,124,255,0.2), rgba(200,164,78,0.1));
  border: 1px solid rgba(43,124,255,0.2);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.4);
  font-size: 0.9rem;
  position: relative;
}

.hero-image-placeholder::before {
  content: '';
  position: absolute;
  inset: -20px;
  border-radius: 50%;
  border: 1px dashed rgba(43,124,255,0.15);
  animation: spin 60s linear infinite;
}

/* ── Cards ── */
.card {
  background: #fff;
  border-radius: var(--radius);
  padding: 36px;
  border: 1px solid var(--color-border-light);
  transition: var(--transition);
}

.card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.card-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--color-accent), var(--color-primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.card h3 {
  margin-bottom: 12px;
  color: var(--color-primary);
}

.card p {
  font-size: 0.9rem;
  line-height: 1.8;
}

/* ── Grid Layouts ── */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

/* ── Product Cards ── */
.product-card {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border-light);
  transition: var(--transition);
}

.product-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.product-card-img {
  height: 220px;
  background: linear-gradient(135deg, var(--color-bg-alt), #dde4f0);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  position: relative;
  overflow: hidden;
}

.product-card-img::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(43,124,255,0.05), rgba(200,164,78,0.03));
}

.product-card-body {
  padding: 28px;
}

.product-card-body .tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  background: rgba(43,124,255,0.08);
  color: var(--color-accent);
  margin-bottom: 12px;
}

.product-card-body h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
}

.product-card-body p {
  font-size: 0.875rem;
  margin-bottom: 16px;
}

.product-card-body a {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-accent);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.product-card-body a:hover {
  gap: 10px;
}

/* ── Advantages ── */
.advantage-item {
  display: flex;
  gap: 20px;
  padding: 28px 0;
  border-bottom: 1px solid var(--color-border-light);
}

.advantage-item:last-child {
  border-bottom: none;
}

.advantage-num {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-accent), var(--color-primary));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-en);
  font-weight: 700;
  font-size: 1.1rem;
}

.advantage-content h4 {
  margin-bottom: 6px;
  color: var(--color-primary);
}

.advantage-content p {
  font-size: 0.9rem;
}

/* ── Trust / Partners ── */
.trust-section {
  background: var(--color-primary);
  color: #fff;
  text-align: center;
}

.trust-section .section-label {
  color: var(--color-gold);
}

.trust-section .section-title {
  color: #fff;
}

.trust-section .section-desc {
  color: rgba(255,255,255,0.6);
}

.trust-logos {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.trust-logo-item {
  padding: 20px 32px;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius);
  font-family: var(--font-en);
  font-size: 1.5rem;
  font-weight: 700;
  color: rgba(255,255,255,0.8);
  letter-spacing: 2px;
}

.trust-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.trust-tag {
  padding: 8px 20px;
  border-radius: 20px;
  border: 1px solid rgba(255,255,255,0.2);
  color: rgba(255,255,255,0.7);
  font-size: 0.85rem;
  transition: var(--transition);
}

.trust-tag:hover {
  background: rgba(255,255,255,0.1);
  color: #fff;
}

/* ── Footer ── */
.footer {
  background: var(--color-primary);
  color: #fff;
  padding: 60px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand p {
  color: rgba(255,255,255,0.5);
  font-size: 0.875rem;
  margin-top: 16px;
  line-height: 1.7;
}

.footer h4 {
  color: #fff;
  margin-bottom: 20px;
  font-size: 0.95rem;
}

.footer ul li {
  margin-bottom: 10px;
}

.footer ul li a {
  color: rgba(255,255,255,0.5);
  font-size: 0.875rem;
  transition: var(--transition);
}

.footer ul li a:hover {
  color: var(--color-accent-glow);
}

.footer-contact-item {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin-bottom: 12px;
  font-size: 0.875rem;
  color: rgba(255,255,255,0.5);
}

.footer-contact-item .icon {
  flex-shrink: 0;
  width: 20px;
  color: var(--color-accent-glow);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.3);
}

/* ── Page Header ── */
.page-header {
  background: linear-gradient(135deg, #0a1f44 0%, #1a3a6c 100%);
  padding: 140px 0 80px;
  text-align: center;
  color: #fff;
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(43,124,255,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(43,124,255,0.05) 1px, transparent 1px);
  background-size: 60px 60px;
}

.page-header h1 {
  color: #fff;
  margin-bottom: 16px;
  position: relative;
}

.page-header p {
  color: rgba(255,255,255,0.6);
  max-width: 600px;
  margin: 0 auto;
  position: relative;
}

.breadcrumb {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 20px;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.5);
  position: relative;
}

.breadcrumb a {
  color: rgba(255,255,255,0.5);
}

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

/* ── About Section ── */
.about-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-img {
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 4/3;
  background: linear-gradient(135deg, #e8edf5, #d0d8e8);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.about-text h2 {
  margin-bottom: 20px;
}

.about-text p {
  margin-bottom: 16px;
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.stat-item {
  text-align: center;
  padding: 24px;
  background: var(--color-bg-alt);
  border-radius: var(--radius);
}

.stat-num {
  font-family: var(--font-en);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--color-text-light);
}

/* ── Services ── */
.service-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  padding: 60px 0;
}

.service-block:nth-child(even) {
  direction: rtl;
}

.service-block:nth-child(even) > * {
  direction: ltr;
}

.service-block-img {
  border-radius: var(--radius-lg);
  aspect-ratio: 16/10;
  background: linear-gradient(135deg, #e8edf5, #d0d8e8);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  overflow: hidden;
}

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

.service-block-content .section-label {
  text-align: left;
}

.service-block-content h3 {
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.service-block-content p {
  margin-bottom: 24px;
}

.service-block-content ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.service-block-content ul li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--color-text-light);
}

.service-block-content ul li::before {
  content: '✓';
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(43,124,255,0.1);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  flex-shrink: 0;
}

/* ── Contact ── */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 48px;
}

.contact-info-card {
  display: flex;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border-light);
}

.contact-info-card:last-child {
  border-bottom: none;
}

.contact-info-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--color-accent), var(--color-primary-light));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.contact-info-content h4 {
  margin-bottom: 4px;
  font-size: 0.95rem;
}

.contact-info-content p {
  font-size: 0.875rem;
}

.contact-form {
  background: var(--color-bg-alt);
  padding: 40px;
  border-radius: var(--radius-lg);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-primary);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-family: inherit;
  background: #fff;
  transition: var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(43,124,255,0.1);
}

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

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* ── News ── */
.news-card {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border-light);
  transition: var(--transition);
}

.news-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.news-card-img {
  height: 200px;
  background: linear-gradient(135deg, #e8edf5, #d0d8e8);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  overflow: hidden;
}

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

.news-card-body {
  padding: 24px;
}

.news-card-date {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.news-card-body h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.news-card-body p {
  font-size: 0.875rem;
  margin-bottom: 12px;
}

.news-card-body a {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-accent);
}

/* ── Applications ── */
.app-card {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border-light);
  transition: var(--transition);
}

.app-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.app-card-img {
  height: 200px;
  background: linear-gradient(135deg, #e8edf5, #d0d8e8);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  overflow: hidden;
}

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

.app-card-body {
  padding: 24px;
}

.app-card-body .tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  background: rgba(200,164,78,0.1);
  color: var(--color-gold);
  margin-bottom: 12px;
}

.app-card-body h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.app-card-body p {
  font-size: 0.875rem;
}

/* ── CTA Banner ── */
.cta-banner {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  border-radius: var(--radius-lg);
  padding: 60px;
  text-align: center;
  color: #fff;
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(43,124,255,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(43,124,255,0.05) 1px, transparent 1px);
  background-size: 40px 40px;
}

.cta-banner h2 {
  color: #fff;
  margin-bottom: 16px;
  position: relative;
}

.cta-banner p {
  color: rgba(255,255,255,0.6);
  margin-bottom: 32px;
  position: relative;
}

.cta-banner .btn {
  position: relative;
}

.navbar:not(.scrolled) .nav-logo img {
  filter: brightness(0) invert(1); /* 变白 */
}
.footer-brand img {
  filter: brightness(0) invert(1);
  opacity: 0.9;
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-content p {
    margin: 0 auto 36px;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-visual {
    display: none;
  }

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

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

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

  .about-intro {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 768px) {
  section {
    padding: 60px 0;
  }

  .nav-links {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 24px;
    gap: 0;
    box-shadow: var(--shadow-lg);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    padding: 14px 0;
    color: var(--color-text) !important;
    border-bottom: 1px solid var(--color-border-light);
    width: 100%;
  }

  .nav-toggle {
    display: flex;
  }

  .lang-switch {
    display: none;
  }

  .lang-switch-mobile {
    display: flex !important;
    justify-content: center;
    gap: 16px;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--color-border-light);
  }

  .lang-switch-mobile a {
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-light);
    border: 1px solid var(--color-border);
  }

  .lang-switch-mobile a.active {
    background: var(--color-accent);
    color: #fff;
    border-color: var(--color-accent);
  }

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

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

  .service-block {
    grid-template-columns: 1fr;
  }

  .service-block:nth-child(even) {
    direction: ltr;
  }

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

  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }

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

  .hero {
    min-height: 90vh;
  }

  .cta-banner {
    padding: 40px 24px;
  }
}

.lang-switch-mobile {
  display: none;
}