/* ============================================================
   Wen Bright — Main Stylesheet
   Songyuan Wenliang Network Technology Co., Ltd.
   ============================================================ */

/* --- CSS Variables --- */
:root {
  --color-bg: #FFFBF7;
  --color-surface: #FFFFFF;
  --color-text: #141418;
  --color-text-soft: #3D3D44;
  --color-muted: #6B6B76;
  --color-accent: #E8432E;
  --color-accent-hover: #C83725;
  --color-accent-soft: #FFF0ED;
  --color-seafoam: #1AAB9B;
  --color-seafoam-soft: #EDFAF8;
  --color-border: #E8E4DF;
  --color-border-light: #F2EFEA;
  --font-sans: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-display: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --width-contained: 1200px;
  --width-narrow: 800px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.10);
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* --- 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-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover {
  color: var(--color-accent-hover);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
}

h1 { font-size: clamp(2.8rem, 6vw, 4.5rem); letter-spacing: -0.03em; }
h2 { font-size: clamp(2rem, 4vw, 3rem); letter-spacing: -0.02em; }
h3 { font-size: clamp(1.4rem, 2.5vw, 1.8rem); letter-spacing: -0.01em; }

p { margin-bottom: 1rem; }

/* --- Skip Link --- */
.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  background: var(--color-text);
  color: #FFFFFF;
  padding: 10px 20px;
  z-index: 10000;
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: top var(--transition-fast);
}
.skip-link:focus {
  top: 16px;
}

/* --- Horizontal Rule --- */
hr {
  border: none;
  height: 1px;
  background: var(--color-border);
  margin: 2rem 0;
}

/* --- Navigation — minimal top bar --- */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,251,247,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
  transition: box-shadow var(--transition-base);
}
.site-nav.scrolled {
  box-shadow: var(--shadow-sm);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--width-contained);
  margin: 0 auto;
  padding: 0 2rem;
  height: 64px;
}
.nav-brand {
  font-weight: 800;
  font-size: 1.35rem;
  color: var(--color-text);
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 10px;
}
.nav-brand-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-accent);
  display: inline-block;
}
.nav-links {
  display: flex;
  list-style: none;
  gap: 2.5rem;
  align-items: center;
}
.nav-links a {
  color: var(--color-text-soft);
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-base);
}
.nav-links a:hover::after,
.nav-links a:focus-visible::after {
  width: 100%;
}
.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--color-accent);
}
.nav-cta {
  background: var(--color-accent);
  color: #FFFFFF !important;
  padding: 8px 20px;
  border-radius: 50px;
  font-weight: 600 !important;
  transition: background var(--transition-fast) !important;
}
.nav-cta::after { display: none !important; }
.nav-cta:hover {
  background: var(--color-accent-hover);
  color: #FFFFFF !important;
}
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--color-text);
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  margin: 5px 0;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

/* --- Hero — bold typographic with geometric accent --- */
.hero {
  padding: 160px 2rem 120px;
  position: relative;
  overflow: hidden;
}
.hero-inner {
  max-width: var(--width-contained);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 4rem;
}
.hero-text {
  flex: 1 1 55%;
}
.hero-eyebrow {
  display: inline-block;
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  margin-bottom: 1rem;
}
.hero-title {
  margin-bottom: 1.5rem;
}
.hero-title em {
  font-style: normal;
  color: var(--color-accent);
  position: relative;
}
.hero-subtitle {
  font-size: 1.2rem;
  color: var(--color-text-soft);
  max-width: 480px;
  margin-bottom: 2.5rem;
  line-height: 1.6;
}
.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 1rem;
  font-family: var(--font-sans);
  cursor: pointer;
  border: none;
  transition: all var(--transition-base);
  text-decoration: none;
  line-height: 1;
}
.btn-primary {
  background: var(--color-accent);
  color: #FFFFFF;
}
.btn-primary:hover {
  background: var(--color-accent-hover);
  color: #FFFFFF;
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(232,67,46,0.3);
}
.btn-outline {
  background: transparent;
  color: var(--color-text);
  border: 2px solid var(--color-border);
}
.btn-outline:hover {
  border-color: var(--color-text);
  color: var(--color-text);
  transform: translateY(-1px);
}

/* Geometric accent shape */
.hero-visual {
  flex: 1 1 45%;
  position: relative;
  min-height: 320px;
}
.geo-shape {
  position: absolute;
}
.geo-circle {
  width: 220px;
  height: 220px;
  border-radius: 50%;
  border: 4px solid var(--color-accent);
  top: 0;
  right: 40px;
  opacity: 0.85;
}
.geo-square {
  width: 100px;
  height: 100px;
  background: var(--color-seafoam);
  border-radius: var(--radius-md);
  bottom: 20px;
  right: 100px;
  opacity: 0.8;
}
.geo-diamond {
  width: 70px;
  height: 70px;
  background: var(--color-accent-soft);
  transform: rotate(45deg);
  border-radius: 8px;
  top: 130px;
  right: 10px;
}
.geo-dots {
  display: grid;
  grid-template-columns: repeat(6, 12px);
  gap: 10px;
  bottom: 60px;
  right: 180px;
}
.geo-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-muted);
  opacity: 0.3;
}

/* --- Counter Strip --- */
.counter-strip {
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
  padding: 3rem 2rem;
}
.counter-strip-inner {
  max-width: var(--width-contained);
  margin: 0 auto;
  display: flex;
  justify-content: space-around;
  gap: 2rem;
  flex-wrap: wrap;
}
.counter-item {
  text-align: center;
}
.counter-number {
  font-size: 3rem;
  font-weight: 800;
  color: var(--color-accent);
  letter-spacing: -0.02em;
  line-height: 1;
}
.counter-label {
  font-size: 0.9rem;
  color: var(--color-muted);
  margin-top: 0.5rem;
  font-weight: 500;
}

/* --- Section Shared --- */
.section {
  padding: 5rem 2rem;
}
.section-inner {
  max-width: var(--width-contained);
  margin: 0 auto;
}
.section-label {
  display: inline-block;
  font-weight: 700;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-seafoam);
  margin-bottom: 0.75rem;
}
.section-title {
  margin-bottom: 1rem;
}
.section-desc {
  color: var(--color-text-soft);
  font-size: 1.1rem;
  max-width: 560px;
  margin-bottom: 3rem;
}

/* --- Services — asymmetric staggered cards --- */
.services-grid {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  counter-reset: svc;
}
.service-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  display: flex;
  gap: 2rem;
  align-items: flex-start;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
  position: relative;
  overflow: hidden;
}
.service-card:nth-child(odd) {
  margin-left: 0;
  margin-right: 3rem;
}
.service-card:nth-child(even) {
  margin-left: 3rem;
  margin-right: 0;
}
.service-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.service-card::before {
  counter-increment: svc;
  content: "0" counter(svc);
  font-size: 4rem;
  font-weight: 800;
  color: var(--color-border-light);
  line-height: 1;
  flex-shrink: 0;
  min-width: 80px;
}
.service-card-content h3 {
  margin-bottom: 0.5rem;
}
.service-card-content p {
  color: var(--color-text-soft);
  margin-bottom: 0;
}

/* --- Approach — large image + text side by side, NOT 3-col --- */
.approach-layout {
  display: flex;
  gap: 5rem;
  align-items: center;
}
.approach-text {
  flex: 1 1 50%;
}
.approach-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.approach-list li {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}
.approach-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1.2rem;
}
.approach-icon.a { background: #FFF0ED; color: var(--color-accent); }
.approach-icon.b { background: #EDFAF8; color: var(--color-seafoam); }
.approach-icon.c { background: #FFF8E7; color: #E8A317; }
.approach-icon.d { background: #F0EDFA; color: #6B4CB8; }
.approach-item-text strong {
  display: block;
  margin-bottom: 0.2rem;
}
.approach-item-text span {
  color: var(--color-text-soft);
  font-size: 0.95rem;
}
.approach-visual {
  flex: 1 1 50%;
  position: relative;
}
.approach-block {
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-xl);
  padding: 3rem;
  position: relative;
}
.approach-block-quote {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.5;
  position: relative;
  padding-left: 2rem;
  border-left: 4px solid var(--color-accent);
  margin-bottom: 1.5rem;
}
.approach-block-attribution {
  color: var(--color-muted);
  font-size: 0.9rem;
}

/* --- Contact Form --- */
.contact-layout {
  display: flex;
  gap: 4rem;
  align-items: flex-start;
}
.contact-info {
  flex: 1 1 35%;
}
.contact-info-item {
  margin-bottom: 1.5rem;
}
.contact-info-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-muted);
  font-weight: 600;
  margin-bottom: 0.3rem;
}
.contact-info-value {
  color: var(--color-text);
  font-weight: 500;
}
.contact-form-wrap {
  flex: 1 1 65%;
}
.contact-form {
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
}
.form-row {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.25rem;
}
.form-row .form-group {
  flex: 1;
}
.form-group {
  margin-bottom: 1.25rem;
}
.form-group label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.4rem;
  color: var(--color-text);
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--color-text);
  background: var(--color-bg);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(232,67,46,0.12);
}
.form-group textarea {
  min-height: 130px;
  resize: vertical;
}
.form-submit-row {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.form-message {
  font-size: 0.9rem;
  font-weight: 500;
  min-height: 20px;
}
.form-message.success { color: var(--color-seafoam); }
.form-message.error { color: var(--color-accent); }

/* --- Footer --- */
.site-footer {
  background: var(--color-text);
  color: #B0B0B8;
  padding: 4rem 2rem 2rem;
}
.footer-inner {
  max-width: var(--width-contained);
  margin: 0 auto;
}
.footer-top {
  display: flex;
  justify-content: space-between;
  gap: 3rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}
.footer-brand {
  flex: 1 1 280px;
}
.footer-brand .nav-brand {
  color: #FFFFFF;
  margin-bottom: 1rem;
}
.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 1rem;
  color: #9A9AA4;
}
.footer-links {
  display: flex;
  gap: 4rem;
  flex-wrap: wrap;
}
.footer-col h4 {
  color: #FFFFFF;
  font-size: 0.9rem;
  margin-bottom: 1rem;
  font-weight: 700;
}
.footer-col ul {
  list-style: none;
}
.footer-col li { margin-bottom: 0.5rem; }
.footer-col a {
  color: #9A9AA4;
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}
.footer-col a:hover { color: #FFFFFF; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
  color: #757580;
}

/* --- Legal Pages Shared --- */
.legal-page {
  padding: 120px 2rem 5rem;
}
.legal-page .section-inner {
  max-width: var(--width-narrow);
}
.legal-page h1 {
  margin-bottom: 0.5rem;
}
.legal-page .legal-date {
  color: var(--color-muted);
  margin-bottom: 2.5rem;
  font-size: 0.95rem;
}
.legal-page h2 {
  font-size: 1.4rem;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
}
.legal-page h3 {
  font-size: 1.1rem;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}
.legal-page p, .legal-page li {
  font-size: 16px;
  color: var(--color-text-soft);
}
.legal-page ul, .legal-page ol {
  margin-left: 1.5rem;
  margin-bottom: 1rem;
}
.legal-page li {
  margin-bottom: 0.4rem;
}
.legal-page address {
  font-style: normal;
  color: var(--color-text-soft);
  line-height: 1.6;
}

/* --- Scroll Animations --- */
.anim-reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.anim-reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.anim-reveal-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.anim-reveal-left.visible {
  opacity: 1;
  transform: translateX(0);
}
.anim-reveal-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.anim-reveal-right.visible {
  opacity: 1;
  transform: translateX(0);
}
.anim-delay-1 { transition-delay: 0.1s; }
.anim-delay-2 { transition-delay: 0.2s; }
.anim-delay-3 { transition-delay: 0.3s; }
.anim-delay-4 { transition-delay: 0.4s; }

/* --- Responsive --- */
@media (max-width: 900px) {
  .nav-links {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    flex-direction: column;
    padding: 2rem;
    gap: 1.5rem;
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-120%);
    transition: transform var(--transition-slow);
    z-index: 999;
  }
  .nav-links.open {
    transform: translateY(0);
  }
  .nav-toggle {
    display: block;
  }

  .hero-inner {
    flex-direction: column;
    gap: 2rem;
  }
  .hero-visual {
    min-height: 200px;
    width: 100%;
  }
  .hero {
    padding: 120px 1.5rem 60px;
  }

  .service-card:nth-child(odd),
  .service-card:nth-child(even) {
    margin-left: 0;
    margin-right: 0;
  }

  .approach-layout {
    flex-direction: column;
    gap: 2.5rem;
  }

  .contact-layout {
    flex-direction: column;
    gap: 2rem;
  }

  .form-row {
    flex-direction: column;
  }

  .footer-top {
    flex-direction: column;
    gap: 2rem;
  }
  .footer-links {
    gap: 2rem;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .section {
    padding: 3rem 1.5rem;
  }
}

@media (max-width: 480px) {
  .geo-circle {
    width: 140px;
    height: 140px;
  }
  .geo-square {
    width: 60px;
    height: 60px;
    bottom: 0;
    right: 60px;
  }
  .geo-diamond {
    width: 50px;
    height: 50px;
    top: 80px;
    right: 0;
  }
  .counter-number {
    font-size: 2.2rem;
  }
}