/* ========================================
   ZhangPu — CSS by ZhangPu
   Palette: Graphite #1E1D23 | Crimson #C43A52 | Sand #DDB88A | Cloud #F7F5F1
   ======================================== */

:root {
  --color-dark: #1E1D23;
  --color-accent: #C43A52;
  --color-accent-hover: #A33043;
  --color-sand: #DDB88A;
  --color-sand-light: #E8CFA8;
  --color-cloud: #F7F5F1;
  --color-cloud-alt: #EDEAE4;
  --color-text: #1E1D23;
  --color-text-light: #6B6A70;
  --color-text-on-dark: #DCD5CE;
  --color-white: #FFFFFF;
  --color-border: #DFDBD4;
  --font-main: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-display: Georgia, 'Times New Roman', serif;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-main);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-cloud);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.25s ease;
}

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

.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 28px;
}

/* ========== NAVIGATION (.navbar class — NEVER bare nav) ========== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 72px;
  background-color: var(--color-dark);
  z-index: 1000;
  transition: box-shadow 0.3s ease;
}

.navbar.scrolled {
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.18);
}

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

.navbar-logo {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 0.5px;
}

.navbar-logo span {
  color: var(--color-sand);
}

.navbar-links {
  display: flex;
  align-items: center;
  gap: 36px;
  list-style: none;
}

.navbar-links a {
  color: var(--color-text-on-dark);
  font-size: 15px;
  font-weight: 500;
  position: relative;
  padding: 6px 0;
}

.navbar-links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-sand);
  transition: width 0.25s ease;
}

.navbar-links a:hover {
  color: var(--color-white);
}

.navbar-links a:hover::after {
  width: 100%;
}

.navbar-cta {
  background-color: var(--color-accent);
  color: var(--color-white) !important;
  padding: 10px 22px !important;
  border-radius: 6px;
  font-weight: 600 !important;
  transition: background-color 0.25s ease !important;
}

.navbar-cta:hover {
  background-color: var(--color-accent-hover) !important;
}

.navbar-cta::after {
  display: none !important;
}

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

.navbar-toggle span {
  display: block;
  width: 26px;
  height: 2.5px;
  background-color: var(--color-white);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.navbar-toggle.active span:nth-child(1) {
  transform: translateY(7.5px) rotate(45deg);
}

.navbar-toggle.active span:nth-child(2) {
  opacity: 0;
}

.navbar-toggle.active span:nth-child(3) {
  transform: translateY(-7.5px) rotate(-45deg);
}

/* ========== HERO SECTION (.hero-section class) ========== */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background-color: var(--color-dark);
  background-image:
    radial-gradient(ellipse at 30% 50%, rgba(196, 58, 82, 0.12) 0%, transparent 60%),
    radial-gradient(ellipse at 75% 30%, rgba(221, 184, 138, 0.08) 0%, transparent 50%);
  overflow: hidden;
  padding-top: 72px;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: -120px;
  right: -120px;
  width: 520px;
  height: 520px;
  border: 2px solid rgba(221, 184, 138, 0.1);
  border-radius: 50%;
}

.hero-section::after {
  content: '';
  position: absolute;
  bottom: -80px;
  left: -60px;
  width: 340px;
  height: 340px;
  border: 2px solid rgba(196, 58, 82, 0.08);
  border-radius: 50%;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 720px;
  padding: 60px 0;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--color-sand);
  margin-bottom: 24px;
}

.hero-title {
  font-family: var(--font-display);
  font-size: 56px;
  font-weight: 700;
  line-height: 1.15;
  color: var(--color-white);
  margin-bottom: 24px;
}

.hero-title em {
  font-style: normal;
  color: var(--color-sand);
}

.hero-description {
  font-size: 18px;
  line-height: 1.8;
  color: var(--color-text-on-dark);
  margin-bottom: 36px;
  max-width: 580px;
}

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

.btn {
  display: inline-block;
  font-family: var(--font-main);
  font-size: 15px;
  font-weight: 600;
  padding: 14px 32px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  text-align: center;
  transition: all 0.25s ease;
}

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

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

.btn-outline {
  background-color: transparent;
  color: var(--color-white);
  border: 2px solid var(--color-text-on-dark);
}

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

/* ========== ABOUT SECTION (.about-section class) ========== */
.about-section {
  padding: 100px 0;
  background-color: var(--color-cloud);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 72px;
  align-items: center;
}

.about-visual {
  position: relative;
  background-color: var(--color-dark);
  border-radius: 16px;
  height: 420px;
  overflow: hidden;
}

.about-visual-inner {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background-image:
    linear-gradient(135deg, var(--color-dark) 0%, #2A2830 100%);
}

.about-visual-pattern {
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(
      45deg,
      transparent,
      transparent 12px,
      rgba(221, 184, 138, 0.04) 12px,
      rgba(221, 184, 138, 0.04) 14px
    );
}

.about-visual-icon {
  position: relative;
  z-index: 2;
  width: 120px;
  height: 120px;
  border: 3px solid var(--color-sand);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 48px;
  color: var(--color-sand);
}

.about-text .section-label {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--color-accent);
  margin-bottom: 16px;
}

.about-text h2 {
  font-family: var(--font-display);
  font-size: 38px;
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-dark);
  margin-bottom: 24px;
}

.about-text p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text-light);
  margin-bottom: 18px;
}

/* ========== SERVICES SECTION (.services-section class) ========== */
.services-section {
  padding: 100px 0;
  background-color: var(--color-dark);
}

.services-header {
  text-align: center;
  margin-bottom: 64px;
}

.services-header .section-label {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--color-sand);
  margin-bottom: 16px;
}

.services-header h2 {
  font-family: var(--font-display);
  font-size: 38px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 16px;
}

.services-header p {
  font-size: 17px;
  color: var(--color-text-on-dark);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.service-card {
  background-color: #25242B;
  border-radius: 12px;
  padding: 36px 30px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  border: 1px solid rgba(255, 255, 255, 0.04);
}

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.25);
}

.service-icon {
  width: 56px;
  height: 56px;
  border-radius: 12px;
  background: rgba(196, 58, 82, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 22px;
  color: var(--color-accent);
}

.service-card h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 12px;
}

.service-card p {
  font-size: 15px;
  line-height: 1.7;
  color: #A8A5B0;
}

/* ========== FEATURES SECTION (.features-section class) ========== */
.features-section {
  padding: 100px 0;
  background-color: var(--color-cloud-alt);
}

.features-header {
  text-align: center;
  margin-bottom: 64px;
}

.features-header .section-label {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--color-accent);
  margin-bottom: 16px;
}

.features-header h2 {
  font-family: var(--font-display);
  font-size: 38px;
  font-weight: 700;
  color: var(--color-dark);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.feature-item {
  display: flex;
  gap: 20px;
  padding: 28px;
  background-color: var(--color-cloud);
  border-radius: 12px;
  border: 1px solid var(--color-border);
  transition: box-shadow 0.3s ease;
}

.feature-item:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.feature-bullet {
  flex-shrink: 0;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: var(--color-accent);
  margin-top: 5px;
}

.feature-text h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 8px;
}

.feature-text p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-light);
}

/* ========== COUNTERS SECTION (.counters-section class) ========== */
.counters-section {
  padding: 80px 0;
  background-color: var(--color-accent);
}

.counters-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  text-align: center;
}

.counter-item .counter-number {
  font-family: var(--font-display);
  font-size: 48px;
  font-weight: 700;
  color: var(--color-white);
  line-height: 1;
  margin-bottom: 8px;
}

.counter-item .counter-label {
  font-size: 14px;
  font-weight: 500;
  color: #FFFFFF;
  text-transform: uppercase;
  letter-spacing: 1.5px;
}

/* ========== CONTACT SECTION (.contact-section class) ========== */
.contact-section {
  padding: 100px 0;
  background-color: var(--color-cloud);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 72px;
  align-items: start;
}

.contact-info .section-label {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--color-accent);
  margin-bottom: 16px;
}

.contact-info h2 {
  font-family: var(--font-display);
  font-size: 38px;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 24px;
}

.contact-info p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text-light);
  margin-bottom: 32px;
}

.contact-detail {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
  font-size: 16px;
  color: var(--color-text);
}

.contact-detail-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background-color: var(--color-cloud-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: var(--color-accent);
}

/* Form */
.contact-form {
  background-color: var(--color-cloud-alt);
  padding: 36px;
  border-radius: 14px;
  border: 1px solid var(--color-border);
}

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

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  font-family: var(--font-main);
  font-size: 15px;
  color: var(--color-text);
  background-color: var(--color-white);
  border: 2px solid var(--color-border);
  border-radius: 8px;
  transition: border-color 0.25s ease;
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--color-accent);
}

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

.form-submit {
  width: 100%;
  padding: 14px;
  font-size: 16px;
}

.form-feedback {
  margin-top: 14px;
  font-size: 14px;
  font-weight: 500;
  text-align: center;
  min-height: 22px;
}

.form-feedback.success {
  color: #2E7D4F;
}

.form-feedback.error {
  color: var(--color-accent);
}

/* ========== FOOTER ========== */
.site-footer {
  background-color: var(--color-dark);
  padding: 52px 0 28px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 40px;
}

.footer-about h3 {
  font-family: var(--font-display);
  font-size: 20px;
  color: var(--color-white);
  margin-bottom: 16px;
}

.footer-about h3 span {
  color: var(--color-sand);
}

.footer-about p {
  font-size: 14px;
  line-height: 1.7;
  color: #9995A0;
}

.footer-links h4 {
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--color-sand);
  margin-bottom: 16px;
}

.footer-links ul {
  list-style: none;
}

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

.footer-links a {
  font-size: 14px;
  color: #9995A0;
  transition: color 0.25s ease;
}

.footer-links a:hover {
  color: var(--color-white);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: #6B6875;
}

.footer-bottom a {
  color: #8A8795;
}

.footer-bottom a:hover {
  color: var(--color-white);
}

/* ========== SCROLL REVEAL ========== */
.fade-up {
  opacity: 0;
  transform: translateY(36px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========== RESPONSIVE ========== */
@media (max-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .counters-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .navbar-links {
    position: fixed;
    top: 72px;
    left: 0;
    width: 100%;
    flex-direction: column;
    background-color: var(--color-dark);
    padding: 28px 0;
    gap: 0;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.35s ease, opacity 0.35s ease;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
  }

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

  .navbar-links li {
    width: 100%;
    text-align: center;
  }

  .navbar-links a {
    display: block;
    padding: 14px 28px;
  }

  .navbar-cta {
    display: inline-block;
    margin-top: 8px;
  }

  .navbar-toggle {
    display: flex;
  }

  .hero-title {
    font-size: 36px;
  }

  .hero-description {
    font-size: 16px;
  }

  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-visual {
    height: 300px;
  }

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

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 28px;
  }

  .hero-buttons {
    flex-direction: column;
  }

  .hero-buttons .btn {
    width: 100%;
    text-align: center;
  }

  .about-text h2,
  .services-header h2,
  .features-header h2,
  .contact-info h2 {
    font-size: 28px;
  }
}