/* ============================================================
   Lakeside Studio — 样式表
   ============================================================ */

/* ---------- Variables ---------- */
:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --accent: #22d3ee;
  --bg-dark: #0b0d17;
  --bg-card: #11141f;
  --bg-card-hover: #161b2b;
  --text-primary: #f1f3f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border: #1e2433;
  --nav-bg: rgba(11, 13, 23, 0.92);
  --nav-bg-mobile: rgba(11, 13, 23, 0.98);
  --shadow-color: rgba(0, 0, 0, 0.3);
  --hero-gradient-from: #ffffff;
  --radius: 12px;
  --radius-lg: 20px;
  --max-width: 1200px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

/* ---------- Light Mode ---------- */
.light-mode {
  --bg-dark: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --border: #e2e8f0;
  --nav-bg: rgba(248, 250, 252, 0.92);
  --nav-bg-mobile: rgba(248, 250, 252, 0.98);
  --shadow-color: rgba(0, 0, 0, 0.08);
  --accent: #0891b2;
  --hero-gradient-from: #0f172a;
}

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

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

body {
  font-family: var(--font-sans);
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Section Headers ---------- */
.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--primary-light);
  background: rgba(99, 102, 241, 0.1);
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 16px;
}

.section-header h2 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--text-primary), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto;
}

section {
  padding: 100px 0;
  position: relative;
}

/* ============================================================
   NAVBAR
   ============================================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition);
}

.navbar.scrolled {
  background: var(--nav-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

@media (min-width: 769px) {
  .nav-container {
    gap: 48px;
  }
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.25rem;
  font-weight: 700;
}

/* Header Actions (far right in navbar) */
.header-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.logo-icon {
  color: var(--primary-light);
  font-size: 1.4rem;
}

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

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 2px;
  background: var(--primary-light);
  transition: var(--transition);
  border-radius: 1px;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
}

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

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

.hamburger.open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.hamburger.open span:nth-child(2) {
  opacity: 0;
}
.hamburger.open span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Theme Toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: transparent;
  cursor: pointer;
  transition: var(--transition);
  font-size: 1.1rem;
  flex-shrink: 0;
}

.theme-toggle:hover {
  border-color: var(--primary-light);
  background: rgba(99, 102, 241, 0.08);
}

.theme-icon {
  line-height: 1;
  transition: var(--transition);
}

/* Show sun in dark mode (default), show moon in light mode */
.theme-toggle .sun { display: inline; }
.theme-toggle .moon { display: none; }

.light-mode .theme-toggle .sun { display: none; }
.light-mode .theme-toggle .moon { display: inline; }

/* Language Toggle */
.lang-toggle {
  padding: 6px 12px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  transition: var(--transition);
  flex-shrink: 0;
  letter-spacing: 0.5px;
}

.lang-toggle:hover {
  border-color: var(--primary-light);
  color: var(--primary-light);
  background: rgba(99, 102, 241, 0.08);
}

/* ============================================================
   ============================================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding-top: 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 20%, rgba(99, 102, 241, 0.12) 0%, transparent 60%),
    radial-gradient(ellipse 50% 50% at 80% 80%, rgba(34, 211, 238, 0.06) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  background: rgba(34, 211, 238, 0.1);
  padding: 8px 20px;
  border-radius: 100px;
  margin-bottom: 24px;
  border: 1px solid rgba(34, 211, 238, 0.2);
}

.hero h1 {
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--hero-gradient-from) 30%, var(--primary-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 36px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 64px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 100px;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  font-family: inherit;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(99, 102, 241, 0.4);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn-outline:hover {
  border-color: var(--primary-light);
  background: rgba(99, 102, 241, 0.08);
}

.btn-full {
  width: 100%;
}

/* Hero Stats */
.hero-stats {
  display: flex;
  gap: 48px;
  justify-content: center;
}

.stat {
  text-align: center;
}

.stat-num {
  display: block;
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--text-primary);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Scroll Indicator */
.scroll-indicator {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.75rem;
  letter-spacing: 1px;
  animation: float 2s ease-in-out infinite;
}

.scroll-arrow {
  width: 20px;
  height: 20px;
  border-right: 2px solid var(--text-muted);
  border-bottom: 2px solid var(--text-muted);
  transform: rotate(45deg);
}

@keyframes float {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* ============================================================
   ABOUT
   ============================================================ */
.about {
  background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-card) 100%);
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.about-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 28px;
  text-align: center;
  transition: var(--transition);
}

.about-card:hover {
  border-color: rgba(99, 102, 241, 0.3);
  transform: translateY(-4px);
  background: var(--bg-card-hover);
}

.about-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.about-card h3 {
  font-size: 1.2rem;
  margin-bottom: 12px;
}

.about-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* ============================================================
   SERVICES
   ============================================================ */
.services {
  background: var(--bg-card);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 24px;
}

.service-card {
  background: var(--bg-dark);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 28px;
  transition: var(--transition);
}

.service-card:hover {
  border-color: rgba(99, 102, 241, 0.4);
  transform: translateY(-4px);
  box-shadow: 0 20px 40px var(--shadow-color);
}

.service-icon {
  width: 48px;
  height: 48px;
  background: rgba(99, 102, 241, 0.1);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--primary-light);
}

.service-icon svg {
  width: 24px;
  height: 24px;
}

.service-card h3 {
  font-size: 1.15rem;
  margin-bottom: 12px;
}

.service-card p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.65;
}

/* ============================================================
   PORTFOLIO
   ============================================================ */
.portfolio {
  background: var(--bg-dark);
}

.portfolio-filters {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 8px 22px;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
}

.filter-btn:hover,
.filter-btn.active {
  border-color: var(--primary-light);
  color: var(--text-primary);
  background: rgba(99, 102, 241, 0.1);
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
}

.portfolio-item {
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-card);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.portfolio-item:hover {
  transform: translateY(-4px);
  border-color: rgba(99, 102, 241, 0.3);
  box-shadow: 0 20px 40px var(--shadow-color);
}

.portfolio-img {
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.portfolio-placeholder {
  font-size: 1.5rem;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.6);
  letter-spacing: 2px;
}

.portfolio-info {
  padding: 24px;
}

.portfolio-info h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.portfolio-info p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 12px;
}

.portfolio-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--primary-light);
  background: rgba(99, 102, 241, 0.1);
  padding: 4px 12px;
  border-radius: 100px;
}

/* Portfolio filter animation */
.portfolio-item.hidden {
  display: none;
}

/* ============================================================
   TEAM
   ============================================================ */
.team {
  background: var(--bg-card);
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.team-card {
  background: var(--bg-dark);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 24px;
  text-align: center;
  transition: var(--transition);
}

.team-card:hover {
  border-color: rgba(99, 102, 241, 0.3);
  transform: translateY(-4px);
}

.team-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  font-weight: 700;
  color: #fff;
  margin: 0 auto 20px;
}

.team-card h3 {
  font-size: 1.15rem;
  margin-bottom: 4px;
}

.team-role {
  display: block;
  font-size: 0.85rem;
  color: var(--primary-light);
  margin-bottom: 16px;
  font-weight: 500;
}

.team-card p {
  color: var(--text-secondary);
  font-size: 0.88rem;
  margin-bottom: 20px;
}

.team-social {
  display: flex;
  gap: 12px;
  justify-content: center;
}

.team-social a {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: var(--transition);
}

.team-social a:hover {
  border-color: var(--primary-light);
  color: var(--primary-light);
  background: rgba(99, 102, 241, 0.08);
}

/* ============================================================
   TESTIMONIALS
   ============================================================ */
.testimonials {
  background: var(--bg-dark);
  text-align: center;
}

.testimonial-slider {
  max-width: 700px;
  margin: 0 auto;
  position: relative;
}

.testimonial-card {
  display: none;
  animation: fadeIn 0.5s ease;
}

.testimonial-card.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.testimonial-stars {
  color: #fbbf24;
  font-size: 1.5rem;
  margin-bottom: 20px;
  letter-spacing: 4px;
}

.testimonial-card p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 24px;
  font-style: italic;
}

.testimonial-author strong {
  display: block;
  color: var(--text-primary);
  font-size: 1rem;
}

.testimonial-author span {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.testimonial-dots {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-top: 32px;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: none;
  background: var(--border);
  cursor: pointer;
  transition: var(--transition);
  padding: 0;
}

.dot.active {
  background: var(--primary-light);
  width: 32px;
  border-radius: 5px;
}

/* ============================================================
   CONTACT
   ============================================================ */
.contact {
  background: var(--bg-card);
}

.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  padding: 14px 18px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-dark);
  color: var(--text-primary);
  font-size: 0.92rem;
  font-family: inherit;
  transition: var(--transition);
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

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

.contact-form 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 d='M1 1l5 5 5-5' stroke='%2394a3b8' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  cursor: pointer;
}

.contact-form select option {
  background: var(--bg-card);
  color: var(--text-primary);
}

.contact-form textarea {
  resize: vertical;
  min-height: 120px;
}

/* Contact Info */
.contact-info {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.contact-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.contact-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.contact-item h4 {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 4px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.contact-item p,
.contact-item a {
  color: var(--text-primary);
  font-size: 0.95rem;
}

.contact-item a:hover {
  color: var(--primary-light);
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: var(--bg-dark);
  border-top: 1px solid var(--border);
  padding: 60px 0 0;
}

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

.footer-brand .logo-text {
  font-size: 1.2rem;
  font-weight: 700;
  display: block;
  margin-bottom: 12px;
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  max-width: 280px;
}

.footer-links h4 {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 16px;
  font-weight: 600;
}

.footer-links a {
  display: block;
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 10px;
  transition: var(--transition);
}

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

.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 968px) {
  .contact-wrapper {
    grid-template-columns: 1fr;
  }

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

  .footer-brand {
    grid-column: span 2;
  }
}

@media (max-width: 768px) {
  section {
    padding: 72px 0;
  }

  .section-header {
    margin-bottom: 48px;
  }

  .hamburger {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--nav-bg-mobile);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 24px;
    gap: 0;
    border-bottom: 1px solid var(--border);
    display: none;
  }

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

  .nav-links a {
    padding: 14px 0;
    border-bottom: 1px solid var(--border);
  }

  .nav-links a:last-child {
    border-bottom: none;
  }

  .hero-stats {
    gap: 24px;
  }

  .stat-num {
    font-size: 1.6rem;
  }

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

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

  .form-row {
    grid-template-columns: 1fr;
  }

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

  .footer-brand {
    grid-column: span 1;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .hero-stats {
    flex-direction: column;
    gap: 16px;
  }

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

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