/* CSS Variables */
:root {
  --background: #ffffff;
  --foreground: #171717;
  --primary: #2563eb;
  --secondary: #8b5cf6;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --green-500: #22c55e;
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #0a0a0a;
    --foreground: #ededed;
    --primary: #3b82f6;
    --secondary: #a78bfa;
  }
}

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

html {
  font-size: 14px;
}

@media (min-width: 480px) {
  html {
    font-size: 15px;
  }
}

@media (min-width: 768px) {
  html {
    font-size: 16px;
  }
}

body {
  background: var(--background);
  color: var(--foreground);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
    sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  line-height: 1.6;
  -webkit-tap-highlight-color: transparent;
}

/* Custom scrollbar */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: var(--background);
}

::-webkit-scrollbar-thumb {
  background: #888;
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: #555;
}

/* Utilities */
.hidden {
  display: none !important;
}

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

.text-green {
  color: var(--green-500);
}

.hidden-md {
  display: none;
}

@media (min-width: 768px) {
  .hidden-md {
    display: flex;
  }
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0) translateX(-50%);
  }
  50% {
    transform: translateY(-10px) translateX(-50%);
  }
}

.animate-fade-in {
  animation: fadeIn 0.8s ease-out forwards;
}

.animate-float {
  animation: float 3s ease-in-out infinite;
}

/* Gradient text */
.gradient-text {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Icon */
.icon {
  width: 1.25rem;
  height: 1.25rem;
}

@media (min-width: 768px) {
  .icon {
    width: 1.5rem;
    height: 1.5rem;
  }
}

.icon-sm {
  width: 1rem;
  height: 1rem;
}

@media (min-width: 768px) {
  .icon-sm {
    width: 1.25rem;
    height: 1.25rem;
  }
}

/* Container */
.container {
  max-width: 72rem;
  margin: 0 auto;
  padding: 0 0.75rem;
}

.container-sm {
  max-width: 42rem;
}

@media (min-width: 768px) {
  .container {
    padding: 0 1.5rem;
  }
}

/* Section */
.section {
  padding: 2rem 0;
}

@media (min-width: 768px) {
  .section {
    padding: 5rem 0;
  }
}

.section-gray {
  background: var(--gray-50);
}

@media (prefers-color-scheme: dark) {
  .section-gray {
    background: rgba(17, 24, 39, 0.2);
  }
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

@media (min-width: 768px) {
  .section-title {
    font-size: 2.25rem;
    margin-bottom: 2rem;
  }
}

.section-subtitle {
  text-align: center;
  font-size: 0.8rem;
  color: var(--gray-600);
  margin-bottom: 1rem;
}

@media (min-width: 768px) {
  .section-subtitle {
    font-size: 1rem;
    margin-bottom: 2rem;
  }
}

@media (prefers-color-scheme: dark) {
  .section-subtitle {
    color: var(--gray-400);
  }
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

@media (prefers-color-scheme: dark) {
  .nav {
    background: rgba(0, 0, 0, 0.3);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }
}

.nav-container {
  max-width: 72rem;
  margin: 0 auto;
  padding: 0 0.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 3rem;
}

@media (min-width: 768px) {
  .nav-container {
    padding: 0 1.5rem;
    height: 4rem;
  }
}

.nav-logo {
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

@media (min-width: 768px) {
  .nav-logo {
    font-size: 1.5rem;
  }
}

.nav-links {
  display: none;
  align-items: center;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .nav-links {
    display: flex;
    gap: 2rem;
  }
}

.nav-link {
  font-size: 0.875rem;
  color: var(--foreground);
  text-decoration: none;
  transition: color 0.3s;
}

@media (min-width: 768px) {
  .nav-link {
    font-size: 1rem;
  }
}

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

.mobile-menu-btn {
  display: flex;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--foreground);
  padding: 0.5rem;
  margin-right: -0.5rem;
}

@media (min-width: 768px) {
  .mobile-menu-btn {
    display: none;
  }
}

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 40;
  background: var(--background);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
}

.mobile-menu-link {
  font-size: 1.25rem;
  color: var(--foreground);
  text-decoration: none;
  transition: color 0.3s;
  padding: 0.5rem 1rem;
}

.mobile-menu-link:hover {
  color: var(--primary);
}

/* Hero Section */
.hero {
  position: relative;
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

@media (min-width: 768px) {
  .hero {
    min-height: 100vh;
  }
}

.hero-bg {
  position: absolute;
  inset: 0;
}

.hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(0,0,0,0.5), rgba(0,0,0,0.3), var(--background));
}

.hero-content {
  position: relative;
  z-index: 10;
  text-align: center;
  padding: 3rem 0.75rem 0;
}

@media (min-width: 768px) {
  .hero-content {
    padding: 0 1.5rem;
  }
}

.hero-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: white;
  margin-bottom: 0.75rem;
}

@media (min-width: 480px) {
  .hero-title {
    font-size: 2.25rem;
  }
}

@media (min-width: 768px) {
  .hero-title {
    font-size: 4.5rem;
    margin-bottom: 1.5rem;
  }
}

.hero-subtitle {
  font-size: 0.875rem;
  color: #e5e7eb;
  margin-bottom: 1.25rem;
  max-width: 42rem;
  margin-left: auto;
  margin-right: auto;
  padding: 0 0.5rem;
}

@media (min-width: 480px) {
  .hero-subtitle {
    font-size: 1rem;
  }
}

@media (min-width: 768px) {
  .hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    padding: 0;
  }
}

.hero-buttons {
  display: flex;
  flex-direction: row;
  gap: 0.75rem;
  justify-content: center;
  padding: 0;
}

@media (min-width: 768px) {
  .hero-buttons {
    gap: 1rem;
  }
}

.hero-scroll {
  position: absolute;
  bottom: 1.5rem;
  left: 50%;
  color: white;
}

@media (min-width: 768px) {
  .hero-scroll {
    bottom: 2.5rem;
  }
}

.hero-scroll .icon {
  width: 1.25rem;
  height: 1.25rem;
}

@media (min-width: 768px) {
  .hero-scroll .icon {
    width: 2rem;
    height: 2rem;
  }
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.5rem 1.25rem;
  border-radius: 9999px;
  font-size: 0.8rem;
  text-decoration: none;
  transition: all 0.3s;
}

@media (min-width: 768px) {
  .btn {
    padding: 0.75rem 2rem;
    font-size: 1rem;
  }
}

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

.btn-primary:hover {
  background: rgba(37, 99, 235, 0.8);
  transform: scale(1.05);
}

.btn-outline {
  border: 2px solid white;
  color: white;
  background: transparent;
}

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

/* About Section */
.about-grid {
  display: grid;
  gap: 1.5rem;
  align-items: center;
}

@media (min-width: 768px) {
  .about-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 3rem;
  }
}

.profile-img {
  width: 8rem;
  height: 8rem;
  border-radius: 0.75rem;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  margin: 0 auto;
  display: block;
  object-fit: cover;
  object-position: top;
}

@media (min-width: 480px) {
  .profile-img {
    width: 10rem;
    height: 10rem;
  }
}

@media (min-width: 768px) {
  .profile-img {
    width: 18rem;
    height: 18rem;
    margin: 0;
    border-radius: 1rem;
  }
}

.about-content {
  text-align: center;
}

@media (min-width: 768px) {
  .about-content {
    text-align: left;
  }
}

.about-text {
  font-size: 0.875rem;
  color: var(--gray-600);
  line-height: 1.7;
  margin-bottom: 0.75rem;
}

@media (min-width: 768px) {
  .about-text {
    font-size: 1.125rem;
    line-height: 1.75;
    margin-bottom: 1rem;
  }
}

@media (prefers-color-scheme: dark) {
  .about-text {
    color: var(--gray-300);
  }
}

.stats {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  margin-top: 1rem;
}

@media (min-width: 768px) {
  .stats {
    gap: 1.5rem;
    justify-content: flex-start;
    margin-top: 1.5rem;
  }
}

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

.stat-value {
  font-size: 1.25rem;
  font-weight: 700;
}

@media (min-width: 768px) {
  .stat-value {
    font-size: 1.875rem;
  }
}

.stat-label {
  font-size: 0.65rem;
  color: var(--gray-600);
}

@media (min-width: 768px) {
  .stat-label {
    font-size: 0.875rem;
  }
}

@media (prefers-color-scheme: dark) {
  .stat-label {
    color: var(--gray-400);
  }
}

/* Journey Section */
.journey-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  padding: 0 0.75rem;
}

@media (min-width: 768px) {
  .journey-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    padding: 0 1.5rem;
  }
}

.journey-column {
  padding: 0;
}

.journey-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  text-align: center;
}

@media (min-width: 768px) {
  .journey-title {
    font-size: 1.25rem;
    margin-bottom: 1rem;
  }
}

.journey-container {
  position: relative;
}

.scroll-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
  width: 2rem;
  height: 2rem;
  background: rgba(255, 255, 255, 0.8);
  border-radius: 9999px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  cursor: pointer;
  transition: background 0.3s;
  color: var(--gray-600);
}

@media (prefers-color-scheme: dark) {
  .scroll-btn {
    background: rgba(31, 41, 55, 0.8);
    color: var(--gray-300);
  }
}

.scroll-btn:hover {
  background: white;
}

@media (prefers-color-scheme: dark) {
  .scroll-btn:hover {
    background: var(--gray-800);
  }
}

.scroll-left {
  left: 0.25rem;
}

.scroll-right {
  right: 0.25rem;
}

.cards-container {
  overflow-x: auto;
  padding: 0.25rem 0;
  -ms-overflow-style: none;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.cards-container::-webkit-scrollbar {
  display: none;
}

.cards-row {
  display: flex;
  gap: 0.5rem;
  min-width: max-content;
  margin-bottom: 0.5rem;
}

.cards-row:last-child {
  margin-bottom: 0;
}

/* Card */
.card {
  flex-shrink: 0;
  width: 7rem;
  background: white;
  border-radius: 0.5rem;
  overflow: hidden;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  transition: all 0.3s;
}

@media (min-width: 480px) {
  .card {
    width: 8.5rem;
    border-radius: 0.75rem;
  }
}

@media (min-width: 768px) {
  .card {
    width: 11rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  }
}

@media (prefers-color-scheme: dark) {
  .card {
    background: var(--gray-800);
  }
}

.card:hover {
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.2);
  transform: translateY(-0.125rem);
}

@media (min-width: 768px) {
  .card:hover {
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    transform: translateY(-0.25rem);
  }
}

.card-image {
  position: relative;
  height: 5rem;
  overflow: hidden;
}

@media (min-width: 480px) {
  .card-image {
    height: 6rem;
  }
}

@media (min-width: 768px) {
  .card-image {
    height: 7.5rem;
  }
}

.card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s;
}

.card:hover .card-img {
  transform: scale(1.1);
}

.card-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.7), rgba(0,0,0,0.2), transparent);
}

.card-content {
  position: absolute;
  bottom: 0.375rem;
  left: 0.375rem;
  right: 0.375rem;
}

@media (min-width: 768px) {
  .card-content {
    bottom: 0.5rem;
    left: 0.5rem;
    right: 0.5rem;
  }
}

.card-title {
  font-size: 0.7rem;
  font-weight: 700;
  color: white;
}

@media (min-width: 768px) {
  .card-title {
    font-size: 0.875rem;
  }
}

.card-desc {
  font-size: 0.6rem;
  color: #e5e7eb;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

@media (min-width: 768px) {
  .card-desc {
    font-size: 0.75rem;
  }
}

/* Skills Grid */
.skills-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 480px) {
  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }
}

@media (min-width: 768px) {
  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
  }
}

@media (min-width: 1024px) {
  .skills-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* Skill Card */
.skill-card {
  background: white;
  border-radius: 0.75rem;
  padding: 1.25rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  transition: all 0.3s;
  text-align: center;
}

@media (min-width: 768px) {
  .skill-card {
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  }
}

@media (prefers-color-scheme: dark) {
  .skill-card {
    background: var(--gray-800);
  }
}

.skill-card:hover {
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.2);
  transform: translateY(-0.25rem);
}

@media (min-width: 768px) {
  .skill-card:hover {
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    transform: translateY(-0.5rem);
  }
}

.skill-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3.5rem;
  height: 3.5rem;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.2), rgba(139, 92, 246, 0.2));
  border-radius: 0.75rem;
  margin-bottom: 1rem;
  color: var(--primary);
}

@media (min-width: 768px) {
  .skill-icon {
    width: 5rem;
    height: 5rem;
    border-radius: 1rem;
    margin-bottom: 1.5rem;
  }
}

.skill-icon .icon {
  width: 2rem;
  height: 2rem;
}

@media (min-width: 768px) {
  .skill-icon .icon {
    width: 3rem;
    height: 3rem;
  }
}

.skill-title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

@media (min-width: 768px) {
  .skill-title {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
  }
}

.skill-region {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--primary);
  margin-bottom: 0.75rem;
}

@media (min-width: 768px) {
  .skill-region {
    font-size: 0.875rem;
    margin-bottom: 1rem;
  }
}

.skill-desc {
  font-size: 0.75rem;
  color: var(--gray-600);
  line-height: 1.6;
  margin-bottom: 1rem;
}

@media (min-width: 768px) {
  .skill-desc {
    font-size: 0.875rem;
    line-height: 1.75;
    margin-bottom: 1.5rem;
  }
}

@media (prefers-color-scheme: dark) {
  .skill-desc {
    color: var(--gray-300);
  }
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
  justify-content: center;
}

@media (min-width: 768px) {
  .skill-tags {
    gap: 0.5rem;
  }
}

.skill-tag {
  padding: 0.2rem 0.6rem;
  background: var(--gray-100);
  color: var(--gray-700);
  border-radius: 9999px;
  font-size: 0.7rem;
}

@media (min-width: 768px) {
  .skill-tag {
    padding: 0.25rem 0.75rem;
    font-size: 0.875rem;
  }
}

@media (prefers-color-scheme: dark) {
  .skill-tag {
    background: var(--gray-700);
    color: var(--gray-300);
  }
}

/* Contact Section */
.contact-subtitle {
  text-align: center;
  font-size: 0.875rem;
  color: var(--gray-600);
  margin-bottom: 1.25rem;
}

@media (min-width: 768px) {
  .contact-subtitle {
    font-size: 1.125rem;
    margin-bottom: 2rem;
  }
}

@media (prefers-color-scheme: dark) {
  .contact-subtitle {
    color: var(--gray-300);
  }
}

.contact-card {
  background: white;
  border-radius: 0.75rem;
  padding: 0.75rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  display: block;
  width: fit-content;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .contact-card {
    border-radius: 1rem;
    padding: 1.5rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  }
}

@media (prefers-color-scheme: dark) {
  .contact-card {
    background: var(--gray-800);
  }
}

.qrcode {
  width: 8rem;
  height: 8rem;
  object-fit: contain;
  margin: 0 auto;
  border-radius: 0.375rem;
}

@media (min-width: 768px) {
  .qrcode {
    width: 12rem;
    height: 12rem;
    border-radius: 0.5rem;
  }
}

.contact-label {
  margin-top: 0.75rem;
  text-align: center;
  font-weight: 500;
  font-size: 0.8rem;
  color: var(--gray-700);
}

@media (min-width: 768px) {
  .contact-label {
    margin-top: 1rem;
    font-size: 1rem;
  }
}

@media (prefers-color-scheme: dark) {
  .contact-label {
    color: var(--gray-300);
  }
}

.contact-label .icon-sm {
  vertical-align: middle;
  margin-right: 0.375rem;
}

/* Footer */
.footer {
  padding: 1rem 0.75rem;
  border-top: 1px solid var(--gray-200);
}

@media (min-width: 768px) {
  .footer {
    padding: 2rem 1.5rem;
  }
}

@media (prefers-color-scheme: dark) {
  .footer {
    border-top-color: var(--gray-800);
  }
}

.footer-content {
  max-width: 72rem;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
}

@media (min-width: 768px) {
  .footer-content {
    gap: 0.75rem;
  }
}

.footer-title {
  font-size: 1rem;
  font-weight: 700;
}

@media (min-width: 768px) {
  .footer-title {
    font-size: 1.5rem;
  }
}

.footer-copyright {
  font-size: 0.65rem;
  color: var(--gray-600);
}

@media (min-width: 768px) {
  .footer-copyright {
    font-size: 0.875rem;
  }
}

@media (prefers-color-scheme: dark) {
  .footer-copyright {
    color: var(--gray-400);
  }
}

.footer-links {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.65rem;
}

@media (min-width: 768px) {
  .footer-links {
    flex-direction: row;
    gap: 1rem;
    font-size: 0.875rem;
  }
}

.footer-link {
  color: var(--gray-500);
  text-decoration: none;
  transition: color 0.3s;
}

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

.footer-divider {
  color: var(--gray-300);
}

@media (prefers-color-scheme: dark) {
  .footer-divider {
    color: var(--gray-700);
  }
}

.footer-link-icon {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.beian-icon {
  width: 0.625rem;
  height: 0.625rem;
}

@media (min-width: 768px) {
  .beian-icon {
    width: 1rem;
    height: 1rem;
  }
}