/* ============================================================
   BEAR CHIEF — Proprietary Stylesheet
   Qingdao Xiong Jia Shuai Network Technology Co., Ltd.
   bearchief.buzz | connect@bearchief.buzz
   ============================================================ */

/* ----- CUSTOM PROPERTIES ----- */
:root {
  --color-earth-deep:    #2C1810;
  --color-earth-mid:     #4A2C17;
  --color-amber:         #E8A317;
  --color-amber-bright:  #FFB930;
  --color-rust:          #C7511A;
  --color-rust-glow:     #E8652E;
  --color-forest:        #1E3A1F;
  --color-cream:         #FFF8EE;
  --color-cream-warm:    #F5EDE0;
  --color-charcoal:      #1A1210;
  --color-slate:         #3D322B;
  --color-mist:          #8C7B6E;
  --color-white:         #FFFFFF;
  --color-black:         #0A0705;

  --font-heading: 'Georgia', 'Times New Roman', serif;
  --font-body:    'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  --font-mono:    'SF Mono', 'Cascadia Code', 'Consolas', monospace;

  --shadow-heavy: 0 12px 40px -8px #0A0705;
  --shadow-card:  0 4px 24px -4px #2C1810;
  --shadow-amber: 0 0 32px #E8A317;
}

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

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

body {
  font-family: var(--font-body);
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--color-cream);
  background: var(--color-charcoal);
  overflow-x: hidden;
}

/* ----- TYPOGRAPHY ----- */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2.75rem, 7vw, 5.5rem); }
h2 { font-size: clamp(2rem, 5vw, 3.5rem); }
h3 { font-size: clamp(1.35rem, 3vw, 2rem); }

a {
  color: var(--color-amber);
  text-decoration: none;
  transition: color 0.2s ease;
}
a:hover { color: var(--color-amber-bright); }

p, li { font-size: 1.125rem; }

/* ----- UTILITY ----- */
.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;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ----- NAVIGATION ----- */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--color-earth-deep);
  border-bottom: 2px solid var(--color-amber);
  transition: transform 0.3s ease;
}

.site-nav--hidden { transform: translateY(-100%); }

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  height: 72px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-amber);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.nav-brand svg { width: 40px; height: 40px; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 2.25rem;
  list-style: none;
}

.nav-links a {
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-cream);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-amber);
  transition: width 0.25s ease;
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 28px;
  height: 3px;
  background: var(--color-amber);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-toggle--open span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.nav-toggle--open span:nth-child(2) { opacity: 0; }
.nav-toggle--open span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* ----- HERO ----- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-earth-deep);
  overflow: hidden;
  padding-top: 72px;
}

.hero__bg-pattern {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero__bg-pattern::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -20%;
  width: 80%;
  height: 140%;
  background:
    radial-gradient(ellipse at 40% 40%, var(--color-earth-mid) 0%, transparent 70%),
    radial-gradient(ellipse at 55% 55%, var(--color-forest) 0%, transparent 55%);
  transform: rotate(-8deg);
}

.hero__bg-pattern::after {
  content: '';
  position: absolute;
  bottom: -10%;
  left: -5%;
  width: 50%;
  height: 60%;
  background:
    radial-gradient(ellipse at center, var(--color-rust) 0%, transparent 60%);
  opacity: 0.4;
}

.hero__accent-lines {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(135deg, transparent 48%, var(--color-amber) 48%, var(--color-amber) 49%, transparent 49%),
    linear-gradient(225deg, transparent 48%, var(--color-amber) 48%, var(--color-amber) 49%, transparent 49%);
  background-size: 200px 200px;
  opacity: 0.04;
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 900px;
  padding: 4rem 2rem;
}

.hero__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--color-amber);
  border: 1px solid var(--color-amber);
  padding: 0.5rem 1.25rem;
  margin-bottom: 2rem;
}

.hero h1 {
  color: var(--color-cream);
  margin-bottom: 1.5rem;
}

.hero h1 span {
  display: block;
  color: var(--color-amber);
}

.hero__subtitle {
  font-size: 1.35rem;
  color: var(--color-mist);
  max-width: 620px;
  margin: 0 auto 2.5rem;
  line-height: 1.6;
}

.hero__cta-group {
  display: flex;
  gap: 1.25rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ----- BUTTONS ----- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.9rem 2rem;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.3s ease, background 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  position: relative;
  overflow: hidden;
}

.btn--primary {
  background: var(--color-amber);
  color: var(--color-earth-deep);
  border-color: var(--color-amber);
}

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

.btn--outline {
  background: transparent;
  color: var(--color-amber);
  border-color: var(--color-amber);
}

.btn--outline:hover {
  background: var(--color-amber);
  color: var(--color-earth-deep);
  transform: translateY(-2px);
}

.btn--large {
  font-size: 1.125rem;
  padding: 1.1rem 2.75rem;
}

/* ----- SECTION COMMON ----- */
.section {
  padding: 7rem 0;
}

.section--dark  { background: var(--color-charcoal); }
.section--earth { background: var(--color-earth-deep); }
.section--mid   { background: var(--color-earth-mid); }
.section--light { background: var(--color-cream-warm); color: var(--color-earth-deep); }

.section__header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 4rem;
}

.section__header h2 {
  color: inherit;
  margin-bottom: 1rem;
}

.section--dark .section__header h2,
.section--earth .section__header h2,
.section--mid .section__header h2 { color: var(--color-cream); }

.section__accent-line {
  display: block;
  width: 64px;
  height: 4px;
  background: var(--color-amber);
  margin: 0.75rem auto;
}

.section__header p {
  color: var(--color-mist);
  font-size: 1.2rem;
}

.section--light .section__header p { color: var(--color-slate); }

/* ----- COUNTER STRIP ----- */
.counter-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  max-width: 1000px;
  margin: 0 auto;
  text-align: center;
}

.counter-item { padding: 2rem; }

.counter-item__number {
  font-family: var(--font-heading);
  font-size: clamp(3rem, 8vw, 5rem);
  font-weight: 700;
  color: var(--color-amber);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.counter-item__label {
  font-size: 1.125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-mist);
}

/* ----- SERVICE CARDS ----- */
.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  max-width: 1100px;
  margin: 0 auto;
}

.service-card {
  position: relative;
  background: var(--color-earth-deep);
  border: 1px solid var(--color-earth-mid);
  padding: 2.75rem 2rem;
  transition: transform 0.3s ease, border-color 0.3s ease;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--color-amber);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s ease;
}

.service-card:hover::before { transform: scaleX(1); }
.service-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-amber);
}

.service-card__icon {
  width: 56px;
  height: 56px;
  margin-bottom: 1.5rem;
  color: var(--color-amber);
}

.service-card h3 {
  color: var(--color-cream);
  margin-bottom: 0.75rem;
}

.service-card p {
  color: var(--color-mist);
  font-size: 1rem;
  line-height: 1.65;
}

/* ----- APPROACH ----- */
.approach-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  max-width: 1100px;
  margin: 0 auto;
}

.approach-visual {
  position: relative;
  aspect-ratio: 4 / 3;
  background: var(--color-earth-mid);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.approach-visual__emblem {
  width: 180px;
  height: 180px;
  color: var(--color-amber);
  opacity: 0.85;
}

.approach-visual::after {
  content: '';
  position: absolute;
  inset: 16px;
  border: 2px solid var(--color-amber);
  opacity: 0.3;
}

.approach-text h3 {
  color: var(--color-cream);
  margin-bottom: 1.25rem;
}

.approach-text p {
  color: var(--color-mist);
  margin-bottom: 1.25rem;
}

.approach-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.approach-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  color: var(--color-cream);
  font-weight: 600;
}

.approach-list li svg {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  color: var(--color-amber);
  margin-top: 0.15rem;
}

/* ----- CONTACT FORM ----- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  max-width: 1100px;
  margin: 0 auto;
}

.contact-info h3 {
  color: var(--color-cream);
  margin-bottom: 1.25rem;
}

.contact-info > p {
  color: var(--color-mist);
  margin-bottom: 2rem;
}

.contact-detail {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.contact-detail svg {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  color: var(--color-amber);
}

.contact-detail strong {
  display: block;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-mist);
  margin-bottom: 0.2rem;
}

.contact-detail span {
  color: var(--color-cream);
  font-size: 1.125rem;
}

.form-card {
  background: var(--color-earth-deep);
  border: 1px solid var(--color-earth-mid);
  padding: 2.5rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-mist);
  margin-bottom: 0.5rem;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.85rem 1rem;
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--color-cream);
  background: var(--color-charcoal);
  border: 1px solid var(--color-slate);
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-amber);
  box-shadow: 0 0 0 3px #E8A317;
}

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

.form-group select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%23E8A317' d='M6 8L0 0h12z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}

.form-message {
  display: none;
  padding: 1rem;
  margin-top: 1rem;
  font-weight: 600;
  font-size: 0.95rem;
}

.form-message--success {
  display: block;
  background: #1E3A1F;
  color: #8BC34A;
  border: 1px solid #8BC34A;
}

.form-message--error {
  display: block;
  background: #3E1111;
  color: #EF9A9A;
  border: 1px solid #EF9A9A;
}

/* ----- FOOTER ----- */
.site-footer {
  background: var(--color-black);
  border-top: 3px solid var(--color-amber);
  padding: 4rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  max-width: 1100px;
  margin: 0 auto 3rem;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.footer-brand span {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-amber);
  text-transform: uppercase;
}

.footer-brand svg { width: 36px; height: 36px; }

.footer-col p {
  color: var(--color-mist);
  font-size: 0.95rem;
  line-height: 1.6;
}

.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-cream);
  margin-bottom: 1.25rem;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.footer-col ul a {
  color: var(--color-mist);
  font-size: 0.95rem;
}

.footer-col ul a:hover { color: var(--color-amber); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  max-width: 1100px;
  margin: 0 auto;
  padding-top: 2rem;
  border-top: 1px solid var(--color-slate);
  color: var(--color-mist);
  font-size: 0.85rem;
}

/* ----- PAGE HERO (sub-pages) ----- */
.page-hero {
  padding: 10rem 0 4rem;
  background: var(--color-earth-deep);
  text-align: center;
  border-bottom: 2px solid var(--color-amber);
}

.page-hero h1 {
  color: var(--color-cream);
  margin-bottom: 0.75rem;
}

.page-hero p {
  color: var(--color-mist);
  font-size: 1.1rem;
}

/* ----- LEGAL CONTENT ----- */
.legal-content {
  max-width: 850px;
  margin: 0 auto;
  padding: 4rem 2rem;
}

.legal-content h2 {
  color: var(--color-earth-deep);
  font-size: 1.75rem;
  margin: 2.5rem 0 1rem;
}

.legal-content h2:first-child { margin-top: 0; }

.legal-content h3 {
  color: var(--color-earth-mid);
  margin: 1.75rem 0 0.75rem;
}

.legal-content p,
.legal-content li {
  color: var(--color-slate);
  font-size: 1.125rem;
  line-height: 1.8;
  margin-bottom: 1rem;
}

.legal-content ul,
.legal-content ol {
  padding-left: 1.5rem;
  margin-bottom: 1.5rem;
}

.legal-content strong {
  color: var(--color-earth-deep);
}

.legal-content a {
  color: var(--color-rust);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.legal-content address {
  font-style: normal;
  color: var(--color-slate);
  line-height: 1.8;
}

/* ----- ANIMATIONS (JS-driven) ----- */
[data-animate] {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

[data-animate].is-visible {
  opacity: 1;
  transform: translateY(0);
}

[data-animate="fade-left"]  { transform: translateX(-40px); }
[data-animate="fade-right"] { transform: translateX(40px); }
[data-animate="fade-left"].is-visible,
[data-animate="fade-right"].is-visible { transform: translateX(0); }

[data-animate="scale-up"] {
  transform: scale(0.9);
  opacity: 0;
}

[data-animate="scale-up"].is-visible {
  transform: scale(1);
  opacity: 1;
}

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }
.delay-5 { transition-delay: 0.5s; }

/* ----- RESPONSIVE ----- */
@media (max-width: 1024px) {
  .service-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: 3rem; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  html { font-size: 15px; }

  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-earth-deep);
    border-bottom: 2px solid var(--color-amber);
    padding: 1.5rem 2rem;
    gap: 1.25rem;
  }

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

  .nav-toggle { display: flex; }

  .service-grid { grid-template-columns: 1fr; }
  .counter-strip { grid-template-columns: 1fr; gap: 0.5rem; }
  .approach-grid { grid-template-columns: 1fr; gap: 2rem; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }

  .hero__cta-group { flex-direction: column; align-items: center; }

  .section { padding: 4rem 0; }
}