/* ============================================================
   Humble Glow — 陕西谦彩网络科技有限公司
   Gentle Radiance Design System
   No gradients. No rgba(). Pure warm tones.
   ============================================================ */

/* --- CSS Custom Properties --- */
:root {
  --amber: #D48A3C;
  --amber-deep: #B8742E;
  --brown: #7B5B3A;
  --brown-dark: #5C3D22;
  --cream: #F5EDE0;
  --cream-light: #FAF5EE;
  --gold: #C9A96E;
  --gold-light: #D9BF8E;
  --charcoal: #2D2D2D;
  --charcoal-soft: #3D3D3D;
  --white: #FAFAF7;
  --white-pure: #FFFFFF;

  --font-heading: 'Georgia', 'Times New Roman', serif;
  --font-body: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SFMono-Regular', 'Consolas', 'Liberation Mono', monospace;

  --shadow-sm: 0 2px 4px #2D2D2D1A;
  --shadow-md: 0 4px 12px #2D2D2D26;
  --shadow-lg: 0 8px 24px #2D2D2D33;
  --shadow-xl: 0 12px 36px #2D2D2D40;
  --shadow-card-overlap: 0 -6px 20px #2D2D2D1A, 0 6px 20px #2D2D2D1A;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;

  --max-width: 1100px;
  --max-width-narrow: 780px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  color: var(--charcoal);
  background: var(--white);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --- Skip Link --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-sm);
  background: var(--amber);
  color: var(--white-pure);
  padding: var(--space-xs) var(--space-sm);
  z-index: 10000;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  font-weight: 600;
  text-decoration: none;
}
.skip-link:focus {
  top: 0;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--charcoal);
  line-height: 1.3;
  font-weight: 400;
}

h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); }
h2 { font-size: clamp(1.7rem, 3.5vw, 2.6rem); }
h3 { font-size: clamp(1.3rem, 2.5vw, 1.8rem); }
h4 { font-size: 1.2rem; }

p {
  margin-bottom: var(--space-sm);
}

a {
  color: var(--amber);
  text-decoration: none;
  transition: color 0.25s ease;
}
a:hover,
a:focus-visible {
  color: var(--amber-deep);
  text-decoration: underline;
}
a:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
  border-radius: 2px;
}

ul, ol {
  padding-left: 1.5rem;
  margin-bottom: var(--space-sm);
}
li {
  margin-bottom: 0.4rem;
}

strong {
  color: var(--brown);
}

hr {
  border: none;
  border-top: 1px solid var(--gold-light);
  margin: var(--space-xl) 0;
}

/* --- Site Header --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--white);
  border-bottom: 1px solid var(--cream);
  padding: 0 var(--space-lg);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-logo {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.header-logo .logo-mark {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.header-logo .logo-text {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  color: var(--brown);
  letter-spacing: 0.02em;
}

/* --- Navigation --- */
.primary-nav {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.primary-nav a {
  font-size: 0.95rem;
  color: var(--charcoal-soft);
  font-weight: 500;
  padding: var(--space-xs) 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.25s ease, color 0.25s ease;
  text-decoration: none;
}
.primary-nav a:hover,
.primary-nav a:focus-visible {
  color: var(--amber);
  border-bottom-color: var(--amber);
  text-decoration: none;
}

.nav-lang {
  font-size: 0.8rem;
  color: var(--gold);
  margin-left: var(--space-sm);
  font-family: var(--font-mono);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
  z-index: 1001;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--charcoal);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.hamburger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.hamburger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.hamburger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --- Mobile Nav Panel --- */
.mobile-nav {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--white);
  z-index: 999;
  padding: var(--space-xl) var(--space-lg);
  flex-direction: column;
  gap: var(--space-md);
  transform: translateX(100%);
  transition: transform 0.35s ease;
}
.mobile-nav.open {
  transform: translateX(0);
}
.mobile-nav a {
  font-size: 1.2rem;
  font-family: var(--font-heading);
  color: var(--charcoal);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--cream);
  text-decoration: none;
}
.mobile-nav a:hover,
.mobile-nav a:focus-visible {
  color: var(--amber);
  text-decoration: none;
}

/* --- Section Base --- */
.section {
  padding: var(--space-2xl) var(--space-lg);
}

.section-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--gold);
  margin-bottom: var(--space-sm);
}

.section-title {
  margin-bottom: var(--space-lg);
  position: relative;
}

/* Warm accent line — thin amber rule below title */
.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: var(--amber);
  margin-top: var(--space-sm);
}

/* --- Hero — Centered Statement --- */
.hero {
  min-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: calc(64px + var(--space-2xl)) var(--space-lg) var(--space-2xl);
  background: var(--cream-light);
  position: relative;
  overflow: hidden;
}

/* Decorative glow circles — pure CSS box-shadow, no gradient */
.hero::before {
  content: '';
  position: absolute;
  top: -120px;
  right: -80px;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: var(--gold);
  opacity: 0.15;
  filter: blur(60px);
  pointer-events: none;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -100px;
  left: -60px;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: var(--amber);
  opacity: 0.12;
  filter: blur(50px);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: var(--max-width-narrow);
}

.hero-content .hero-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-lg);
  display: block;
}

.hero-content h1 {
  margin-bottom: var(--space-md);
  color: var(--brown-dark);
}

.hero-content .hero-subtitle {
  font-size: 1.15rem;
  color: var(--charcoal-soft);
  margin-bottom: var(--space-lg);
  line-height: 1.8;
}

.hero-content .hero-chinese {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  color: var(--gold);
  margin-bottom: var(--space-lg);
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-lg);
  background: var(--amber);
  color: var(--white-pure);
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: background 0.25s ease, transform 0.2s ease;
  text-decoration: none;
  font-size: 1rem;
}
.hero-cta:hover,
.hero-cta:focus-visible {
  background: var(--amber-deep);
  color: var(--white-pure);
  text-decoration: none;
  transform: translateY(-1px);
}

/* --- Scrolldown indicator --- */
.scrolldown {
  position: absolute;
  bottom: var(--space-lg);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  color: var(--gold);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  animation: scrolldown-pulse 2s ease-in-out infinite;
  z-index: 1;
}
.scrolldown svg {
  width: 20px;
  height: 20px;
}
@keyframes scrolldown-pulse {
  0%, 100% { opacity: 0.6; transform: translateX(-50%) translateY(0); }
  50% { opacity: 1; transform: translateX(-50%) translateY(6px); }
}

/* --- Asymmetric Card Stack (About) --- */
.card-stack {
  position: relative;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-xl) 0;
}

.card-stack .stack-anchor {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--cream);
}

.card-stack .card {
  background: var(--white-pure);
  border: 1px solid var(--cream);
  border-radius: var(--radius-lg);
  padding: var(--space-xl) var(--space-lg);
  margin-bottom: var(--space-lg);
  position: relative;
  box-shadow: var(--shadow-md);
  transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.card-stack .card:hover {
  box-shadow: var(--shadow-card-overlap);
  transform: translateY(-2px);
}

.card-stack .card.card-offset-1 {
  margin-left: clamp(1rem, 8vw, 6rem);
  margin-top: -2rem;
}

.card-stack .card.card-offset-2 {
  margin-left: clamp(2rem, 14vw, 10rem);
  margin-top: -2rem;
}

.card-stack .card .card-number {
  font-family: var(--font-heading);
  font-size: 3rem;
  color: var(--cream);
  position: absolute;
  top: var(--space-md);
  right: var(--space-lg);
  line-height: 1;
  pointer-events: none;
  user-select: none;
}

.card-stack .card h3 {
  margin-bottom: var(--space-sm);
  color: var(--brown);
}

.card-stack .card p {
  color: var(--charcoal-soft);
  max-width: 600px;
}

/* --- Interlaced Service Bands --- */
.service-band {
  display: flex;
  align-items: stretch;
  min-height: 360px;
  border-top: 1px solid var(--cream);
}

.service-band:last-child {
  border-bottom: 1px solid var(--cream);
}

.service-band .band-visual {
  flex: 0 0 38%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--cream-light);
  padding: var(--space-xl);
  position: relative;
  overflow: hidden;
}

.service-band .band-visual svg {
  width: 100px;
  height: 100px;
}

.service-band .band-content {
  flex: 1;
  padding: var(--space-xl) var(--space-lg);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.service-band .band-content h3 {
  color: var(--brown);
  margin-bottom: var(--space-sm);
}

.service-band .band-content p {
  color: var(--charcoal-soft);
  max-width: 520px;
  margin-bottom: var(--space-sm);
}

.service-band .band-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--gold);
  border: 1px solid var(--gold-light);
  padding: 2px 10px;
  border-radius: 20px;
  align-self: flex-start;
}

.service-band.band-reverse {
  flex-direction: row-reverse;
}

/* --- Philosophy Block --- */
.philosophy {
  background: var(--brown-dark);
  color: var(--cream);
  padding: var(--space-2xl) var(--space-lg);
  position: relative;
  overflow: hidden;
}

.philosophy::before {
  content: '';
  position: absolute;
  top: -60px;
  right: -60px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: var(--amber);
  opacity: 0.08;
  filter: blur(40px);
  pointer-events: none;
}

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

.philosophy .section-title {
  color: var(--cream-light);
}
.philosophy .section-title::after {
  background: var(--amber);
}

.philosophy-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xl);
  max-width: var(--max-width);
  margin: 0 auto;
}

.philosophy-item {
  flex: 1 1 240px;
  padding: var(--space-lg);
  border-left: 3px solid var(--amber);
}

.philosophy-item h4 {
  color: var(--gold-light);
  margin-bottom: var(--space-sm);
  font-size: 1.1rem;
}

.philosophy-item p {
  color: var(--cream);
  opacity: 0.85;
  font-size: 0.95rem;
  line-height: 1.7;
}

/* --- Contact Section --- */
.contact {
  max-width: var(--max-width-narrow);
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg);
  text-align: center;
}

.contact-card {
  background: var(--white-pure);
  border: 1px solid var(--cream);
  border-radius: var(--radius-xl);
  padding: var(--space-xl) var(--space-lg);
  box-shadow: var(--shadow-lg);
  margin-top: var(--space-xl);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  text-align: left;
}

.form-row {
  display: flex;
  gap: var(--space-md);
}

.form-row .form-field {
  flex: 1;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.form-field label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--brown);
  letter-spacing: 0.02em;
}

.form-field label .required {
  color: var(--amber);
}

.form-field input,
.form-field textarea {
  padding: 0.8rem 1rem;
  border: 1px solid var(--cream);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--charcoal);
  background: var(--cream-light);
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
  width: 100%;
}

.form-field input:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--amber);
  box-shadow: 0 0 0 3px #D48A3C26;
}

.form-field input::placeholder,
.form-field textarea::placeholder {
  color: var(--gold);
}

.form-field textarea {
  min-height: 140px;
  resize: vertical;
}

.form-field .field-error {
  font-size: 0.8rem;
  color: #C0392B;
  display: none;
}

.form-field.error input,
.form-field.error textarea {
  border-color: #C0392B;
}

.form-field.error .field-error {
  display: block;
}

.form-submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-xl);
  background: var(--brown);
  color: var(--white-pure);
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  align-self: flex-start;
  transition: background 0.25s ease, transform 0.2s ease;
}
.form-submit:hover,
.form-submit:focus-visible {
  background: var(--brown-dark);
  transform: translateY(-1px);
  outline: none;
}

.form-success {
  display: none;
  text-align: center;
  padding: var(--space-xl);
  color: var(--brown);
  font-family: var(--font-heading);
  font-size: 1.2rem;
}

/* --- Counters (integrated, not a bar) --- */
.counter-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xl);
  justify-content: center;
  padding: var(--space-xl) 0;
  max-width: var(--max-width);
  margin: 0 auto;
}

.counter-item {
  text-align: center;
  padding: var(--space-md);
  min-width: 140px;
}

.counter-item .counter-value {
  font-family: var(--font-heading);
  font-size: 2.8rem;
  color: var(--amber);
  line-height: 1;
}

.counter-item .counter-label {
  font-size: 0.85rem;
  color: var(--charcoal-soft);
  margin-top: var(--space-xs);
  letter-spacing: 0.04em;
}

/* --- Footer --- */
.site-footer {
  background: var(--charcoal);
  color: var(--cream);
  padding: var(--space-2xl) var(--space-lg) var(--space-lg);
}

.footer-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xl);
  max-width: var(--max-width);
  margin: 0 auto var(--space-xl);
}

.footer-brand {
  flex: 2 1 300px;
}

.footer-brand .logo-mark-sm {
  width: 28px;
  height: 28px;
  margin-bottom: var(--space-sm);
}

.footer-brand h4 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  color: var(--cream-light);
  margin-bottom: var(--space-xs);
}

.footer-brand p {
  font-size: 0.9rem;
  color: var(--gold-light);
  opacity: 0.8;
  line-height: 1.6;
}

.footer-links {
  flex: 1 1 160px;
}

.footer-links h5 {
  font-family: var(--font-heading);
  color: var(--gold-light);
  margin-bottom: var(--space-sm);
  font-size: 0.95rem;
}

.footer-links a {
  display: block;
  color: var(--cream);
  opacity: 0.75;
  font-size: 0.9rem;
  padding: 0.25rem 0;
  text-decoration: none;
  transition: opacity 0.25s ease, color 0.25s ease;
}
.footer-links a:hover,
.footer-links a:focus-visible {
  opacity: 1;
  color: var(--amber);
  text-decoration: none;
}

.footer-bottom {
  border-top: 1px solid var(--charcoal-soft);
  padding-top: var(--space-md);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-sm);
  max-width: var(--max-width);
  margin: 0 auto;
  font-size: 0.8rem;
  color: var(--cream);
  opacity: 0.6;
}

.footer-bottom a {
  color: var(--gold-light);
  text-decoration: none;
}

/* --- Page Header (subpages) --- */
.page-header {
  background: var(--cream-light);
  padding: calc(64px + var(--space-xl)) var(--space-lg) var(--space-xl);
  text-align: center;
}

.page-header h1 {
  color: var(--brown-dark);
  margin-bottom: var(--space-xs);
}

.page-header .page-subtitle {
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* --- Policy / TOS Content --- */
.policy-content {
  max-width: var(--max-width-narrow);
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg);
  font-size: 16px;
  line-height: 1.8;
  color: var(--charcoal);
}

.policy-content h2 {
  color: var(--brown);
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
  font-size: 1.5rem;
}

.policy-content h3 {
  color: var(--brown-dark);
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
  font-size: 1.2rem;
}

.policy-content p,
.policy-content li {
  font-size: 16px;
  margin-bottom: var(--space-sm);
}

.policy-content .last-updated {
  color: var(--gold);
  font-style: italic;
  margin-bottom: var(--space-xl);
}

/* --- Scroll Animations --- */
.anim-fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.anim-fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

.anim-fade-in {
  opacity: 0;
  transition: opacity 0.8s ease;
}
.anim-fade-in.visible {
  opacity: 1;
}

.anim-slide-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.anim-slide-left.visible {
  opacity: 1;
  transform: translateX(0);
}

/* Stagger delays for card children */
.anim-stagger > *:nth-child(1) { transition-delay: 0s; }
.anim-stagger > *:nth-child(2) { transition-delay: 0.12s; }
.anim-stagger > *:nth-child(3) { transition-delay: 0.24s; }
.anim-stagger > *:nth-child(4) { transition-delay: 0.36s; }
.anim-stagger > *:nth-child(5) { transition-delay: 0.48s; }

/* --- Utility --- */
.text-center { text-align: center; }
.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;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  :root {
    --space-2xl: 3.5rem;
  }

  .primary-nav {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .mobile-nav {
    display: flex;
  }

  .service-band,
  .service-band.band-reverse {
    flex-direction: column;
    min-height: auto;
  }

  .service-band .band-visual {
    flex: none;
    height: 180px;
  }

  .card-stack .card.card-offset-1,
  .card-stack .card.card-offset-2 {
    margin-left: 0;
    margin-top: var(--space-sm);
  }

  .form-row {
    flex-direction: column;
    gap: var(--space-md);
  }

  .footer-grid {
    flex-direction: column;
    gap: var(--space-lg);
  }

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

  .counter-group {
    gap: var(--space-lg);
  }

  .counter-item .counter-value {
    font-size: 2.2rem;
  }

  .philosophy-item {
    flex: 1 1 100%;
  }
}

@media (max-width: 480px) {
  .section {
    padding: var(--space-xl) var(--space-sm);
  }

  .hero {
    padding: calc(64px + var(--space-lg)) var(--space-sm) var(--space-xl);
    min-height: 80vh;
  }

  .card-stack .card {
    padding: var(--space-lg) var(--space-md);
  }

  .card-stack .card .card-number {
    font-size: 2rem;
    top: var(--space-sm);
    right: var(--space-md);
  }

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

  .policy-content {
    padding: var(--space-xl) var(--space-sm);
  }
}