/* ========================================
   智作岛设计中心 - 全局样式
   ======================================== */

/* CSS Variables */
:root {
  --color-primary: #1a1a1a;
  --color-secondary: #666666;
  --color-accent: #ff6b35;
  --color-accent-hover: #e55a2b;
  --color-bg: #ffffff;
  --color-bg-light: #f8f9fa;
  --color-bg-dark: #1a1a1a;
  --color-text: #1a1a1a;
  --color-text-light: #666666;
  --color-text-muted: #999999;
  --color-border: #e5e5e5;
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-family-heading: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
  --max-width: 1200px;
  --header-height: 72px;
}

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

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

body {
  font-family: var(--font-family);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-heading);
  font-weight: 600;
  line-height: 1.3;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  letter-spacing: -0.01em;
}

h3 {
  font-size: clamp(1.25rem, 2vw, 1.5rem);
}

p {
  color: var(--color-text-light);
}

/* Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ========================================
   Header & Navigation
   ======================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: all var(--transition-normal);
}

.header.scrolled {
  box-shadow: var(--shadow-sm);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.25rem;
  font-weight: 600;
}

.logo img {
  height: 40px;
  width: auto;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.logo-text .brand {
  font-size: 1.25rem;
  color: var(--color-primary);
}

.logo-text .domain {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-list {
  display: flex;
  gap: 32px;
}

.nav-link {
  position: relative;
  font-size: 0.95rem;
  color: var(--color-text);
  padding: 8px 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-fast);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-text);
}

/* Mobile Menu */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  transition: all var(--transition-fast);
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

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

.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: calc(var(--header-height) + 60px) 24px 80px;
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-light) 100%);
}

.hero-content {
  max-width: 800px;
}

.hero h1 {
  margin-bottom: 16px;
  color: var(--color-primary);
}

.hero-slogan {
  font-size: 1.5rem;
  color: var(--color-accent);
  margin-bottom: 24px;
  font-weight: 500;
}

.hero-desc {
  font-size: 1.125rem;
  color: var(--color-text-light);
  margin-bottom: 40px;
  line-height: 1.8;
}

.hero .btn {
  margin-top: 16px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 500;
  border-radius: 8px;
  transition: all var(--transition-fast);
}

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

.btn-primary:hover {
  background: var(--color-accent-hover);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(255, 107, 53, 0.3);
}

.btn-secondary {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-secondary:hover {
  background: var(--color-primary);
  color: #ffffff;
}

.btn-outline {
  background: transparent;
  color: var(--color-accent);
  border: 2px solid var(--color-accent);
}

.btn-outline:hover {
  background: var(--color-accent);
  color: #ffffff;
}

/* ========================================
   Sections
   ======================================== */
.section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-header h2 {
  margin-bottom: 16px;
}

.section-header p {
  max-width: 600px;
  margin: 0 auto;
}

.section-dark {
  background: var(--color-bg-dark);
  color: #ffffff;
}

.section-dark h2,
.section-dark h3 {
  color: #ffffff;
}

.section-dark p {
  color: rgba(255, 255, 255, 0.7);
}

.section-gray {
  background: var(--color-bg-light);
}

/* ========================================
   About Section
   ======================================== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.about-content h2 {
  margin-bottom: 24px;
}

.about-content p {
  margin-bottom: 16px;
  line-height: 1.8;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-top: 8px;
}

.about-image {
  position: relative;
}

.about-image-placeholder {
  width: 100%;
  aspect-ratio: 4/3;
  background: linear-gradient(135deg, var(--color-bg-light) 0%, var(--color-border) 100%);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  color: var(--color-text-muted);
}

/* Features */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-card {
  background: var(--color-bg);
  padding: 40px 32px;
  border-radius: 16px;
  text-align: center;
  transition: all var(--transition-normal);
  border: 1px solid transparent;
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-border);
}

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 24px;
  background: linear-gradient(135deg, var(--color-accent) 0%, #ff8c5a 100%);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
}

.feature-card h3 {
  margin-bottom: 12px;
  font-size: 1.25rem;
}

.feature-card p {
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ========================================
   Portfolio Section
   ======================================== */
.portfolio-filters {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 48px;
}

.filter-btn {
  padding: 10px 24px;
  font-size: 0.95rem;
  color: var(--color-text-light);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 24px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover,
.filter-btn.active {
  color: #ffffff;
  background: var(--color-primary);
  border-color: var(--color-primary);
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 32px;
}

.portfolio-card {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  background: var(--color-bg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  cursor: pointer;
}

.portfolio-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.portfolio-card-image {
  position: relative;
  aspect-ratio: 16/10;
  overflow: hidden;
}

.portfolio-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.portfolio-card:hover .portfolio-card-image img {
  transform: scale(1.05);
}

.portfolio-card-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.portfolio-card:hover .portfolio-card-overlay {
  opacity: 1;
}

.portfolio-card-overlay span {
  color: #ffffff;
  font-size: 1rem;
  font-weight: 500;
  padding: 12px 24px;
  border: 2px solid #ffffff;
  border-radius: 8px;
}

.portfolio-card-content {
  padding: 24px;
}

.portfolio-card-tag {
  display: inline-block;
  padding: 4px 12px;
  font-size: 0.75rem;
  color: var(--color-accent);
  background: rgba(255, 107, 53, 0.1);
  border-radius: 4px;
  margin-bottom: 12px;
}

.portfolio-card h3 {
  font-size: 1.125rem;
  margin-bottom: 8px;
}

.portfolio-card p {
  font-size: 0.875rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ========================================
   Portfolio Detail
   ======================================== */
.portfolio-detail {
  padding-top: calc(var(--header-height) + 40px);
}

.portfolio-detail-header {
  text-align: center;
  margin-bottom: 60px;
}

.portfolio-detail-header .tag {
  display: inline-block;
  padding: 6px 16px;
  font-size: 0.875rem;
  color: var(--color-accent);
  background: rgba(255, 107, 53, 0.1);
  border-radius: 20px;
  margin-bottom: 16px;
}

.portfolio-detail-header h1 {
  margin-bottom: 24px;
}

.portfolio-detail-meta {
  display: flex;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
}

.portfolio-detail-meta-item {
  text-align: center;
}

.portfolio-detail-meta-item .label {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 4px;
}

.portfolio-detail-meta-item .value {
  font-size: 1rem;
  color: var(--color-text);
  font-weight: 500;
}

.portfolio-detail-content {
  max-width: 900px;
  margin: 0 auto;
}

.portfolio-detail-section {
  margin-bottom: 60px;
}

.portfolio-detail-section h2 {
  font-size: 1.5rem;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}

.portfolio-detail-section p {
  line-height: 1.8;
  margin-bottom: 16px;
}

.portfolio-detail-images {
  display: grid;
  gap: 24px;
}

.portfolio-detail-images img {
  width: 100%;
  border-radius: 12px;
  box-shadow: var(--shadow-md);
}

.portfolio-detail-images .image-full {
  grid-column: 1 / -1;
}

.portfolio-detail-images .image-half {
  grid-column: span 2;
}

.portfolio-back {
  text-align: center;
  margin-top: 60px;
  padding-top: 60px;
  border-top: 1px solid var(--color-border);
}

/* ========================================
   Contact Section
   ======================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.contact-info h2 {
  margin-bottom: 24px;
}

.contact-info > p {
  margin-bottom: 40px;
  line-height: 1.8;
}

.contact-methods {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-method {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  background: var(--color-bg);
  border-radius: 12px;
  transition: all var(--transition-fast);
}

.contact-method:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-md);
}

.contact-method-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--color-accent) 0%, #ff8c5a 100%);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.contact-method-content {
  flex: 1;
}

.contact-method-content .label {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 4px;
}

.contact-method-content .value {
  font-size: 1rem;
  color: var(--color-text);
  font-weight: 500;
}

.contact-method-content a {
  color: var(--color-accent);
}

.contact-method-content a:hover {
  text-decoration: underline;
}

/* Contact Form */
.contact-form {
  background: var(--color-bg);
  padding: 48px;
  border-radius: 20px;
  box-shadow: var(--shadow-lg);
}

.contact-form h3 {
  font-size: 1.5rem;
  margin-bottom: 32px;
}

.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  font-size: 0.95rem;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--color-text);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 18px;
  font-size: 1rem;
  font-family: inherit;
  color: var(--color-text);
  background: var(--color-bg-light);
  border: 2px solid transparent;
  border-radius: 10px;
  transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  background: var(--color-bg);
}

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

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-text-muted);
}

.contact-form .btn {
  width: 100%;
  padding: 16px;
  font-size: 1.05rem;
}

/* ========================================
   Footer
   ======================================== */
.footer {
  background: var(--color-bg-dark);
  color: #ffffff;
  padding: 60px 0 30px;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 60px;
  margin-bottom: 40px;
}

.footer-brand .logo {
  margin-bottom: 16px;
}

.footer-brand .logo .brand {
  color: #ffffff;
}

.footer-brand p {
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.8;
}

.footer-links h4 {
  font-size: 1rem;
  margin-bottom: 20px;
  color: #ffffff;
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.95rem;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-bottom p {
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.875rem;
}

.footer-social {
  display: flex;
  gap: 16px;
}

.footer-social a {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  color: #ffffff;
  transition: all var(--transition-fast);
}

.footer-social a:hover {
  background: var(--color-accent);
  transform: translateY(-3px);
}

/* ========================================
   Page Header
   ======================================== */
.page-header {
  padding: calc(var(--header-height) + 80px) 0 60px;
  background: linear-gradient(180deg, var(--color-bg-light) 0%, var(--color-bg) 100%);
  text-align: center;
}

.page-header h1 {
  margin-bottom: 16px;
}

.page-header p {
  max-width: 600px;
  margin: 0 auto;
  font-size: 1.125rem;
}

/* ========================================
   Services Section
   ======================================== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.service-card {
  background: var(--color-bg);
  padding: 32px 28px;
  border-radius: 16px;
  text-align: center;
  border: 1px solid var(--color-border);
  transition: all var(--transition-normal);
}

.service-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
}

.service-icon {
  font-size: 2.5rem;
  margin-bottom: 20px;
}

.service-card h3 {
  font-size: 1.125rem;
  margin-bottom: 12px;
}

.service-card p {
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.animate-fade-in-up {
  animation: fadeInUp 0.6s ease forwards;
}

.animate-fade-in {
  animation: fadeIn 0.6s ease forwards;
}

.delay-1 {
  animation-delay: 0.1s;
}

.delay-2 {
  animation-delay: 0.2s;
}

.delay-3 {
  animation-delay: 0.3s;
}

.delay-4 {
  animation-delay: 0.4s;
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .about-image {
    order: -1;
  }

  .features-grid,
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .footer-content {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
  }

  .nav-list.active {
    display: flex;
  }

  .menu-toggle {
    display: flex;
  }

  .hero {
    padding: calc(var(--header-height) + 40px) 20px 60px;
  }

  .hero-slogan {
    font-size: 1.25rem;
  }

  .hero-desc {
    font-size: 1rem;
  }

  .section {
    padding: 60px 0;
  }

  .section-header {
    margin-bottom: 40px;
  }

  .features-grid,
  .services-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .portfolio-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .about-stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .stat-number {
    font-size: 2rem;
  }

  .portfolio-detail-meta {
    gap: 24px;
  }

  .contact-form {
    padding: 32px 24px;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 32px;
    text-align: center;
  }

  .footer-bottom {
    justify-content: center;
    text-align: center;
  }

  .portfolio-detail-images .image-half {
    grid-column: 1;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero h1 {
    font-size: 1.75rem;
  }

  .btn {
    padding: 12px 24px;
    font-size: 0.95rem;
  }

  .portfolio-filters {
    gap: 8px;
  }

  .filter-btn {
    padding: 8px 16px;
    font-size: 0.875rem;
  }
}

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

.text-accent {
  color: var(--color-accent);
}

.mb-0 {
  margin-bottom: 0;
}

.mt-40 {
  margin-top: 40px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}