/* ========================================
   谋界 moujie.com - 品牌官网样式
   黑白极简 · 高级咨询感
   ======================================== */

/* CSS Variables */
:root {
  /* Colors */
  --color-black: #0A0A0A;
  --color-white: #FFFFFF;
  --color-gray-100: #F5F5F5;
  --color-gray-200: #E5E5E5;
  --color-gray-400: #888888;
  --color-gray-600: #555555;
  
  /* Typography */
  --font-sans: 'Noto Sans SC', 'Helvetica Neue', Arial, sans-serif;
  
  /* Spacing */
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 48px;
  --space-xl: 64px;
  --space-2xl: 96px;
  --space-3xl: 128px;
  
  /* Transitions */
  --ease-out: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-out-back: cubic-bezier(0.34, 1.56, 0.64, 1);
  
  /* Layout */
  --max-width: 1200px;
  --nav-height: 72px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-black);
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

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

/* Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  transition: background 0.3s var(--ease-out);
}

.navbar.scrolled {
  background: rgba(10, 10, 10, 0.95);
  backdrop-filter: blur(10px);
}

.navbar__container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar__logo {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 0.1em;
}

.navbar__menu {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.navbar__link {
  font-size: 14px;
  font-weight: 400;
  color: var(--color-white);
  opacity: 0.8;
  transition: opacity 0.2s var(--ease-out);
}

.navbar__link:hover {
  opacity: 1;
}

.navbar__link--cta {
  padding: 10px 24px;
  border: 1px solid var(--color-white);
  opacity: 1;
  transition: all 0.2s var(--ease-out);
}

.navbar__link--cta:hover {
  background: var(--color-white);
  color: var(--color-black);
}

/* Mobile Toggle */
.navbar__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
}

.navbar__toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-white);
  transition: all 0.3s var(--ease-out);
}

.navbar__toggle.active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

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

.navbar__toggle.active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 999;
  background: var(--color-black);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s var(--ease-out);
}

.mobile-menu.active {
  opacity: 1;
  visibility: visible;
}

.mobile-menu__list {
  text-align: center;
}

.mobile-menu__link {
  display: block;
  font-size: 32px;
  font-weight: 700;
  color: var(--color-white);
  padding: var(--space-md);
  transition: opacity 0.2s var(--ease-out);
}

.mobile-menu__link:hover {
  opacity: 0.6;
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--color-black);
  color: var(--color-white);
  overflow: hidden;
}

.hero__bg-grid {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
  0% { transform: translate(0, 0); }
  100% { transform: translate(60px, 60px); }
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: var(--space-xl);
}

.hero__title {
  font-size: clamp(64px, 12vw, 120px);
  font-weight: 700;
  letter-spacing: 0.2em;
  line-height: 1;
  margin-bottom: var(--space-md);
}

.hero__subtitle {
  font-size: clamp(16px, 2vw, 24px);
  font-weight: 300;
  letter-spacing: 0.3em;
  opacity: 0.8;
  margin-bottom: var(--space-lg);
}

.hero__divider {
  width: 60px;
  height: 1px;
  background: var(--color-white);
  margin: 0 auto var(--space-lg);
  opacity: 0.4;
}

.hero__tagline {
  font-size: clamp(18px, 2.5vw, 28px);
  font-weight: 400;
  margin-bottom: var(--space-xl);
  letter-spacing: 0.05em;
}

.hero__cta {
  display: inline-block;
}

/* Scroll Hint */
.hero__scroll-hint {
  position: absolute;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  font-size: 12px;
  letter-spacing: 0.1em;
  opacity: 0.5;
}

.hero__scroll-arrow {
  width: 20px;
  height: 20px;
  border-right: 1px solid currentColor;
  border-bottom: 1px solid currentColor;
  transform: rotate(45deg);
  animation: scrollBounce 2s ease-in-out infinite;
}

@keyframes scrollBounce {
  0%, 100% { transform: rotate(45deg) translate(0, 0); opacity: 1; }
  50% { transform: rotate(45deg) translate(5px, 5px); opacity: 0.5; }
}

/* ========================================
   Buttons
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.05em;
  border: 1px solid var(--color-black);
  background: var(--color-white);
  color: var(--color-black);
  cursor: pointer;
  transition: all 0.2s var(--ease-out);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn:active {
  transform: scale(0.98);
}

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

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

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

.btn--outline:hover {
  background: var(--color-black);
  color: var(--color-white);
}

.btn--large {
  padding: 18px 48px;
  font-size: 16px;
}

/* ========================================
   Section Titles
   ======================================== */
.section-title {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 700;
  line-height: 1.3;
  text-align: center;
  margin-bottom: var(--space-xl);
}

.section-title--dark {
  color: var(--color-black);
}

.section-title--light {
  color: var(--color-white);
}

/* ========================================
   Problem Section
   ======================================== */
.problem {
  position: relative;
  padding: var(--space-3xl) 0;
  background: var(--color-white);
  overflow: hidden;
}

.problem__bg-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: clamp(200px, 30vw, 400px);
  font-weight: 700;
  color: var(--color-gray-100);
  white-space: nowrap;
  pointer-events: none;
  user-select: none;
}

.problem .section-title {
  position: relative;
  z-index: 1;
  margin-bottom: var(--space-xl);
}

.problem__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.problem__card {
  position: relative;
  padding: var(--space-lg);
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  text-align: center;
  transition: all 0.4s var(--ease-out);
}

.problem__card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-black);
  transform: scaleX(0);
  transition: transform 0.4s var(--ease-out);
}

.problem__card:hover::before {
  transform: scaleX(1);
}

.problem__card:hover {
  border-color: var(--color-black);
  transform: translateY(-8px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
}

.problem__card-num {
  position: absolute;
  top: var(--space-md);
  left: var(--space-md);
  font-size: 12px;
  font-weight: 700;
  color: var(--color-gray-400);
  letter-spacing: 0.1em;
}

.problem__card-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-black);
}

.problem__card-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: var(--space-sm);
  color: var(--color-black);
}

.problem__card-text {
  font-size: 14px;
  font-weight: 400;
  color: var(--color-gray-600);
  line-height: 1.7;
}

.problem__conclusion {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
  padding: var(--space-lg) 0;
}

.problem__conclusion-line {
  width: 60px;
  height: 1px;
  background: var(--color-black);
  opacity: 0.3;
}

.problem__conclusion-text {
  font-size: clamp(18px, 2.5vw, 26px);
  font-weight: 400;
  color: var(--color-black);
  text-align: center;
}

.problem__conclusion-highlight {
  font-weight: 700;
  position: relative;
}

.problem__conclusion-highlight::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 8px;
  background: var(--color-gray-200);
  z-index: -1;
}

/* ========================================
   Service Section
   ======================================== */
.service {
  padding: var(--space-3xl) 0;
  background: var(--color-gray-100);
}

.service__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.service__card {
  padding: var(--space-lg);
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  transition: all 0.3s var(--ease-out);
}

.service__card:hover {
  border-color: var(--color-black);
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
}

.service__card-number {
  font-size: 48px;
  font-weight: 700;
  color: var(--color-gray-200);
  margin-bottom: var(--space-md);
}

.service__card-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: var(--space-sm);
  color: var(--color-black);
}

.service__card-desc {
  font-size: 15px;
  font-weight: 400;
  color: var(--color-gray-600);
  line-height: 1.7;
}

/* ========================================
   Cases Section
   ======================================== */
.cases {
  padding: var(--space-3xl) 0;
  background: var(--color-black);
  color: var(--color-white);
}

.cases__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
  text-align: center;
}

.cases__stat {
  padding: var(--space-lg);
}

.cases__stat-number {
  font-size: clamp(48px, 8vw, 72px);
  font-weight: 700;
  line-height: 1;
}

.cases__stat-unit {
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 300;
}

.cases__stat-label {
  font-size: 14px;
  font-weight: 400;
  opacity: 0.6;
  margin-top: var(--space-sm);
  letter-spacing: 0.1em;
}

.cases__gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

.cases__card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  overflow: hidden;
  transition: all 0.4s var(--ease-out);
}

.cases__card:hover {
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-8px);
}

.cases__card--featured {
  transform: scale(1.05);
  border-color: rgba(255, 255, 255, 0.3);
}

.cases__card--featured:hover {
  transform: scale(1.05) translateY(-8px);
}

.cases__card-image {
  position: relative;
  aspect-ratio: 3/4;
  overflow: hidden;
}

.cases__card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--ease-out);
}

.cases__card:hover .cases__card-image img {
  transform: scale(1.08);
}

.cases__card-overlay {
  position: absolute;
  top: var(--space-md);
  left: var(--space-md);
}

.cases__card-tag {
  display: inline-block;
  padding: 6px 16px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  background: rgba(255, 255, 255, 0.95);
  color: var(--color-black);
}

.cases__card-content {
  padding: var(--space-lg);
}

.cases__card-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: var(--space-sm);
}

.cases__card-desc {
  font-size: 14px;
  font-weight: 400;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.7;
}

/* ========================================
   Pricing Section
   ======================================== */
.pricing {
  padding: var(--space-3xl) 0;
  background: var(--color-white);
}

.pricing__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.pricing__card {
  position: relative;
  padding: var(--space-lg);
  border: 1px solid var(--color-gray-200);
  transition: all 0.3s var(--ease-out);
}

.pricing__card:hover {
  border-color: var(--color-black);
}

.pricing__card--featured {
  border-color: var(--color-black);
  transform: scale(1.02);
}

.pricing__card--featured:hover {
  transform: scale(1.02) translateY(-4px);
}

.pricing__card-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  padding: 6px 16px;
  background: var(--color-black);
  color: var(--color-white);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
}

.pricing__card-header {
  margin-bottom: var(--space-md);
}

.pricing__card-label {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--color-gray-400);
  display: block;
  margin-bottom: var(--space-xs);
}

.pricing__card-name {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-black);
}

.pricing__card-price {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: var(--space-md);
  flex-wrap: wrap;
}

.pricing__card-amount {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  color: var(--color-black);
}

.pricing__card-separator {
  font-size: 18px;
  color: var(--color-gray-400);
}

.pricing__card-desc {
  font-size: 14px;
  font-weight: 400;
  color: var(--color-gray-600);
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

.pricing__card-features {
  margin-bottom: var(--space-lg);
}

.pricing__card-features li {
  position: relative;
  padding-left: var(--space-md);
  font-size: 14px;
  color: var(--color-gray-600);
  margin-bottom: var(--space-sm);
}

.pricing__card-features li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--color-gray-400);
}

.pricing__card .btn {
  width: 100%;
}

.pricing__note {
  text-align: center;
  font-size: 14px;
  color: var(--color-gray-400);
}

/* ========================================
   Contact Section
   ======================================== */
.contact {
  padding: var(--space-3xl) 0;
  background: var(--color-black);
  color: var(--color-white);
}

.contact .section-title {
  margin-bottom: var(--space-xl);
}

.contact__limited {
  font-weight: 300;
  opacity: 0.6;
}

.contact__content {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  gap: var(--space-3xl);
  margin-bottom: var(--space-xl);
  flex-wrap: wrap;
}

.contact__qrcode {
  text-align: center;
}

.contact__qrcode-placeholder {
  width: 180px;
  height: 180px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.2);
  margin-bottom: var(--space-md);
  color: var(--color-white);
}

.contact__qrcode-text {
  font-size: 14px;
  opacity: 0.6;
}

.contact__info {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  padding-top: var(--space-md);
}

.contact__info-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.contact__info-label {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  opacity: 0.5;
}

.contact__info-value {
  font-size: 20px;
  font-weight: 400;
}

.contact__cta {
  text-align: center;
  margin-bottom: var(--space-md);
}

.contact__urgency {
  text-align: center;
  font-size: 14px;
  opacity: 0.5;
  letter-spacing: 0.1em;
}

/* ========================================
   Footer
   ======================================== */
.footer {
  padding: var(--space-lg) 0;
  background: var(--color-black);
  color: var(--color-white);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer__content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer__brand {
  display: flex;
  align-items: baseline;
  gap: var(--space-md);
}

.footer__logo {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.footer__tagline {
  font-size: 12px;
  opacity: 0.5;
}

.footer__copyright {
  font-size: 12px;
  opacity: 0.4;
}

/* ========================================
   Animations
   ======================================== */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
  .pricing__grid {
    grid-template-columns: 1fr;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
  }
  
  .pricing__card--featured {
    transform: none;
  }
  
  .pricing__card--featured:hover {
    transform: translateY(-4px);
  }
}

@media (max-width: 768px) {
  :root {
    --space-xl: 48px;
    --space-2xl: 64px;
    --space-3xl: 96px;
    --nav-height: 64px;
  }
  
  .navbar__menu {
    display: none;
  }
  
  .navbar__toggle {
    display: flex;
  }
  
  .hero__title {
    letter-spacing: 0.1em;
  }
  
  .problem__bg-text {
    font-size: 150px;
    opacity: 0.5;
  }
  
  .problem__grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }
  
  .problem__card {
    padding: var(--space-md);
  }
  
  .problem__conclusion {
    flex-direction: column;
    gap: var(--space-md);
  }
  
  .problem__conclusion-line {
    width: 40px;
  }
  
  .service__grid {
    grid-template-columns: 1fr;
  }
  
  .cases__stats {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }
  
  .cases__stat {
    padding: var(--space-md);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }
  
  .cases__gallery {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }
  
  .cases__card--featured {
    transform: none;
  }
  
  .cases__card--featured:hover {
    transform: translateY(-8px);
  }
  
  .cases__card-image {
    aspect-ratio: 4/3;
  }
  
  .contact__content {
    flex-direction: column;
    align-items: center;
    gap: var(--space-xl);
  }
  
  .contact__info {
    align-items: center;
    text-align: center;
  }
  
  .footer__content {
    flex-direction: column;
    text-align: center;
  }
  
  .footer__brand {
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-sm);
  }
  
  .hero__content {
    padding: var(--space-md);
  }
  
  .btn {
    padding: 12px 24px;
    font-size: 13px;
  }
  
  .btn--large {
    padding: 14px 32px;
    width: 100%;
  }
}

/* ========================================
   Accessibility
   ======================================== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  html {
    scroll-behavior: auto;
  }
}

/* Focus styles */
:focus-visible {
  outline: 2px solid var(--color-white);
  outline-offset: 2px;
}

.navbar__link:focus-visible,
.btn:focus-visible {
  outline-color: var(--color-black);
}

/* Selection */
::selection {
  background: var(--color-black);
  color: var(--color-white);
}