/* ========================================
   CSS Variables & Reset
   ======================================== */
:root {
  /* Colors - Light Mode */
  --primary: #f97316;
  --primary-dark: #ea580c;
  --primary-light: #fb923c;
  --accent: #f59e0b;
  --accent-light: #fbbf24;

  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;

  --border-color: #e2e8f0;
  --shadow-color: rgba(15, 23, 42, 0.08);

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;

  /* Typography */
  --font-sans: 'Inter', 'Noto Sans TC', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3.5rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;

  /* Shadows */
  --shadow-sm: 0 1px 2px var(--shadow-color);
  --shadow-md: 0 4px 6px -1px var(--shadow-color), 0 2px 4px -2px var(--shadow-color);
  --shadow-lg: 0 10px 15px -3px var(--shadow-color), 0 4px 6px -4px var(--shadow-color);
  --shadow-xl: 0 20px 25px -5px var(--shadow-color), 0 8px 10px -6px var(--shadow-color);

  /* Container */
  --container-max: 1200px;
  --container-padding: 1.5rem;
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
  :root {
    --primary: #fb923c;
    --primary-dark: #f97316;
    --primary-light: #fdba74;

    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;

    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;

    --border-color: #334155;
    --shadow-color: rgba(0, 0, 0, 0.3);
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
}

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

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

ul {
  list-style: none;
}

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

.gradient-text {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
  position: fixed;
  top: var(--space-sm);
  left: var(--space-sm);
  right: var(--space-sm);
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  transition: var(--transition-base);
}

@media (prefers-color-scheme: dark) {
  .navbar {
    background: rgba(15, 23, 42, 0.85);
  }
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-md);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-weight: 700;
  font-size: var(--font-size-xl);
  cursor: pointer;
}

.logo-icon {
  color: var(--primary);
  font-size: var(--font-size-2xl);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.nav-link {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-secondary);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-md);
  transition: var(--transition-fast);
  cursor: pointer;
}

.nav-link:hover,
.nav-link:focus {
  color: var(--primary);
  background: rgba(99, 102, 241, 0.1);
}

.nav-cta {
  background: var(--primary);
  color: white !important;
  padding: var(--space-xs) var(--space-md);
}

.nav-cta:hover {
  background: var(--primary-dark);
}

/* Hamburger Menu */
.nav-toggle {
  display: none;
}

.nav-toggle-label {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  z-index: 110;
}

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

@media (max-width: 768px) {
  .nav-toggle-label {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    justify-content: center;
    gap: var(--space-lg);
    background: var(--bg-primary);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-base);
  }

  .nav-toggle:checked~.nav-menu {
    opacity: 1;
    visibility: visible;
  }

  .nav-toggle:checked~.nav-toggle-label span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .nav-toggle:checked~.nav-toggle-label span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle:checked~.nav-toggle-label span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .nav-link {
    font-size: var(--font-size-xl);
  }
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3xl) var(--container-padding);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 50%, var(--bg-tertiary) 100%);
  z-index: -2;
}

.hero-bg::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 80%;
  height: 150%;
  background: radial-gradient(circle, rgba(249, 115, 22, 0.15) 0%, transparent 60%);
  animation: float 20s ease-in-out infinite;
}

.hero-bg::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 60%;
  height: 100%;
  background: radial-gradient(circle, rgba(245, 158, 11, 0.12) 0%, transparent 60%);
  animation: float 25s ease-in-out infinite reverse;
}

@keyframes float {

  0%,
  100% {
    transform: translate(0, 0) rotate(0deg);
  }

  33% {
    transform: translate(30px, -30px) rotate(5deg);
  }

  66% {
    transform: translate(-20px, 20px) rotate(-5deg);
  }
}

.hero-content {
  text-align: center;
  max-width: 800px;
  z-index: 1;
}

.hero-badge {
  display: inline-block;
  padding: var(--space-xs) var(--space-md);
  background: rgba(249, 115, 22, 0.1);
  border: 1px solid rgba(249, 115, 22, 0.3);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--primary);
  margin-bottom: var(--space-lg);
  animation: fadeInUp 0.6s ease;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, var(--font-size-5xl));
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: var(--space-md);
  animation: fadeInUp 0.6s ease 0.1s both;
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-xl);
  animation: fadeInUp 0.6s ease 0.2s both;
}

.hero-cta {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--space-2xl);
  animation: fadeInUp 0.6s ease 0.3s both;
}

.hero-stats {
  display: flex;
  gap: var(--space-xl);
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.6s ease 0.4s both;
}

.stat {
  text-align: center;
}

.stat-number {
  display: block;
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--primary);
}

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

.hero-scroll {
  position: absolute;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  animation: fadeInUp 0.6s ease 0.5s both;
}

.scroll-indicator {
  width: 24px;
  height: 40px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-full);
  position: relative;
}

.scroll-indicator::before {
  content: '';
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 8px;
  background: var(--primary);
  border-radius: var(--radius-full);
  animation: scroll 2s ease-in-out infinite;
}

@keyframes scroll {

  0%,
  100% {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }

  50% {
    opacity: 0.5;
    transform: translateX(-50%) translateY(12px);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ========================================
   Buttons
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-lg);
  font-size: var(--font-size-base);
  font-weight: 600;
  border-radius: var(--radius-lg);
  border: 2px solid transparent;
  cursor: pointer;
  transition: var(--transition-base);
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(249, 115, 22, 0.3);
}

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

.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
}

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

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

.btn-full {
  width: 100%;
  justify-content: center;
}

.btn-arrow {
  transition: var(--transition-fast);
}

.btn:hover .btn-arrow {
  transform: translateX(4px);
}

/* ========================================
   Section Styles
   ======================================== */
.section {
  padding: var(--space-3xl) 0;
}

.section-alt {
  background: var(--bg-secondary);
}

.section-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto var(--space-2xl);
}

.section-label {
  display: inline-block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-sm);
}

.section-title {
  font-size: clamp(1.75rem, 4vw, var(--font-size-4xl));
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.section-desc {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
}

/* ========================================
   About Section
   ======================================== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: center;
}

@media (max-width: 900px) {
  .about-grid {
    grid-template-columns: 1fr;
  }
}

.about-content h3 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-md);
}

.about-content p {
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}

.about-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.about-list li {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.check-icon {
  color: var(--primary);
  font-weight: bold;
}

.about-visual {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
  position: relative;
}

.about-card {
  background: var(--bg-primary);
  padding: var(--space-lg);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  transition: var(--transition-base);
  cursor: pointer;
}

.about-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.about-card.card-1 {
  grid-column: span 2;
}

.card-icon {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-sm);
}

.about-card h4 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-xs);
}

.about-card p {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

/* ========================================
   Services Section
   ======================================== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-lg);
}

.service-card {
  background: var(--bg-primary);
  padding: var(--space-xl);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-color);
  transition: var(--transition-base);
  cursor: pointer;
}

.service-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary);
}

.service-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-md);
}

.service-icon svg {
  width: 28px;
  height: 28px;
  color: white;
}

.service-card h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-sm);
}

.service-card p {
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
  font-size: var(--font-size-sm);
}

.service-link {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--primary);
  transition: var(--transition-fast);
}

.service-link:hover {
  color: var(--primary-dark);
}

/* ========================================
   Portfolio Section
   ======================================== */
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

@media (max-width: 600px) {
  .portfolio-grid {
    grid-template-columns: 1fr;
  }
}

.portfolio-item {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  cursor: pointer;
  aspect-ratio: 4/3;
}

.portfolio-item.featured {
  grid-column: span 2;
  aspect-ratio: 21/9;
}

@media (max-width: 600px) {
  .portfolio-item.featured {
    grid-column: span 1;
    aspect-ratio: 4/3;
  }
}

.portfolio-image {
  position: absolute;
  inset: 0;
  transition: var(--transition-slow);
}

.portfolio-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--space-lg);
  background: linear-gradient(to top, rgba(0, 0, 0, 0.8) 0%, transparent 100%);
  color: white;
  opacity: 0;
  transition: var(--transition-base);
}

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

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

.portfolio-category {
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  opacity: 0.8;
  margin-bottom: var(--space-xs);
}

.portfolio-overlay h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-xs);
}

.portfolio-overlay p {
  font-size: var(--font-size-sm);
  opacity: 0.8;
}

/* ========================================
   Pricing Section
   ======================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-primary);
  padding: var(--space-xl);
  border-radius: var(--radius-2xl);
  border: 2px solid var(--border-color);
  display: flex;
  flex-direction: column;
  transition: var(--transition-base);
  position: relative;
}

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

.pricing-card.popular {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(249, 115, 22, 0.1);
}

.popular-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary);
  color: white;
  font-size: var(--font-size-xs);
  font-weight: 600;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-full);
}

.pricing-header {
  text-align: center;
  margin-bottom: var(--space-lg);
}

.pricing-header h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-xs);
}

.pricing-desc {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

.pricing-price {
  text-align: center;
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--border-color);
}

.currency {
  font-size: var(--font-size-lg);
}

.amount {
  font-size: var(--font-size-4xl);
  font-weight: 700;
}

.period {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

.pricing-features {
  flex: 1;
  margin-bottom: var(--space-lg);
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) 0;
  font-size: var(--font-size-sm);
}

.pricing-features .check {
  color: var(--primary);
}

.pricing-features .cross {
  color: var(--text-muted);
}

.pricing-features .disabled {
  color: var(--text-muted);
}

.pricing-card .btn {
  width: 100%;
  justify-content: center;
}

/* ========================================
   Contact Section
   ======================================== */
.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: start;
}

@media (max-width: 900px) {
  .contact-wrapper {
    grid-template-columns: 1fr;
  }
}

.contact-info .section-title {
  text-align: left;
}

.contact-info>p {
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
}

.contact-icon {
  font-size: var(--font-size-2xl);
}

.contact-item h4 {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  margin-bottom: var(--space-xs);
}

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

.contact-form {
  background: var(--bg-secondary);
  padding: var(--space-xl);
  border-radius: var(--radius-2xl);
  border: 1px solid var(--border-color);
}

.form-group {
  margin-bottom: var(--space-md);
}

.form-group label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 500;
  margin-bottom: var(--space-xs);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: var(--space-sm);
  font-size: var(--font-size-base);
  font-family: inherit;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(249, 115, 22, 0.1);
}

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

/* ========================================
   Footer
   ======================================== */
.footer {
  background: var(--bg-secondary);
  padding: var(--space-2xl) 0 var(--space-lg);
  border-top: 1px solid var(--border-color);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

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

@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }

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

.footer-brand p {
  color: var(--text-muted);
  margin: var(--space-sm) 0;
  font-size: var(--font-size-sm);
}

.social-links {
  display: flex;
  gap: var(--space-sm);
}

.social-link {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  transition: var(--transition-fast);
}

.social-link:hover {
  background: var(--primary);
  color: white;
}

.social-link svg {
  width: 20px;
  height: 20px;
}

.footer-links h4 {
  font-size: var(--font-size-sm);
  font-weight: 600;
  margin-bottom: var(--space-md);
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-links a {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  transition: var(--transition-fast);
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border-color);
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

@media (max-width: 480px) {
  .footer-bottom {
    flex-direction: column;
    gap: var(--space-xs);
    text-align: center;
  }
}

/* ========================================
   Back to Top
   ======================================== */
.back-to-top {
  position: fixed;
  bottom: var(--space-lg);
  right: var(--space-lg);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary);
  color: white;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-lg);
  opacity: 0.9;
  transition: var(--transition-fast);
  cursor: pointer;
}

.back-to-top:hover {
  opacity: 1;
  transform: translateY(-4px);
}

.back-to-top svg {
  width: 24px;
  height: 24px;
}