/*
English: styles.css — Main stylesheet for the portfolio. Contains reset, layout, components, responsive rules, and theme variables.
Chinese: styles.css — 站点主样式表，包含重置、布局、组件、响应式规则和主题变量。
*/
/* ===================================
  CSS Reset & Base Styles
  =================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  overflow-anchor: none;
}

:root {
  /* Color Scheme - Based on Bdazzled Blue #245894 */
  --primary-color: #245894;
  --primary-dark: #1a3f6b;
  --primary-light: #3a7bc8;
  --accent-color: #f39c12;
  --text-dark: #2c3e50;
  --text-light: #5a6c7d;
  --bg-light: #f8f9fa;
  --bg-white: #e6f3ff;
  --border-color: #e0e6ed;
  --success-color: #27ae60;
  --error-color: #e74c3c;

  /* Typography */
  --font-heading: "Rubik", sans-serif;
  --font-body: "Open Sans", sans-serif;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 3rem;
  --spacing-xl: 4rem;
}

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

body {
  font-family: var(--font-body);
  color: var(--text-dark);
  line-height: 1.6;
  background: linear-gradient(135deg, #e6f3ff 0%, #d0e8ff 50%, #e0f0ff 100%);
  position: relative;
  overflow-x: hidden;
}

/* Snow Background */
.snowflake {
  position: fixed;
  top: -10px;
  color: white;
  font-size: 1em;
  z-index: 9999;
  pointer-events: none;
  user-select: none;
  animation: fall linear infinite;
}

@keyframes fall {
  to {
    transform: translateY(100vh) rotate(360deg);
  }
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* ===================================
   Typography
   =================================== */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
  color: var(--text-dark);
}

h1 {
  font-size: 2.5rem;
}
h2 {
  font-size: 2rem;
}
h3 {
  font-size: 1.75rem;
}
h4 {
  font-size: 1.5rem;
}
h5 {
  font-size: 1.25rem;
}
h6 {
  font-size: 1rem;
}

p {
  margin-bottom: var(--spacing-sm);
  color: var(--text-light);
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

/* ===================================
   Header & Navigation
   =================================== */
header {
  background-color: var(--bg-white);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 1000;
}

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

/* Main content above stars */
main {
  position: relative;
  z-index: 1;
  background-color: transparent;
}

.logo h1 {
  font-size: 1.5rem;
  color: var(--primary-color);
  margin: 0;
  min-height: 1.5rem;
  display: inline-block;
}

#logo-text::after {
  content: "|";
  animation: blink 0.7s infinite;
}

@keyframes blink {
  0%,
  50% {
    opacity: 1;
  }
  51%,
  100% {
    opacity: 0;
  }
}

nav {
  position: relative;
}

nav ul {
  display: flex;
  list-style: none;
  gap: var(--spacing-md);
}

nav li {
  position: relative;
}

nav a {
  color: var(--text-dark);
  font-weight: 500;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 4px;
  transition: all 0.3s ease;
  display: block;
}

nav a:hover,
nav a.active {
  background-color: var(--primary-color);
  color: var(--bg-white);
}

/* Hamburger Menu Button */
.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 6px;
  background: none;
  border: none;
  padding: 8px;
}

.hamburger span {
  width: 25px;
  height: 3px;
  background-color: var(--text-dark);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(10px, 10px);
}

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

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

/* Dropdown Menu Styles - Pure CSS implementation */
.dropdown {
  position: relative;
}

.dropbtn {
  cursor: pointer;
  display: inline-block;
  width: auto;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: none;
  border: none;
  font: inherit;
  color: var(--text-dark);
  text-decoration: none;
  transition: all 0.3s ease;
  border-radius: 4px;
}

.dropbtn:hover {
  background-color: var(--primary-color);
  color: var(--bg-white);
}

.dropdown-menu {
  position: absolute;
  background-color: var(--bg-white);
  min-width: 200px;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
  border-radius: 4px;
  z-index: 1000;
  top: calc(100% + 5px);
  left: 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
}

/* PC: Show dropdown on hover */
@media (min-width: 601px) {
  .dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
}

.dropdown-menu a {
  color: var(--text-dark);
  padding: 12px 16px;
  text-decoration: none;
  display: block;
  border-radius: 0;
  transition: background-color 0.3s ease;
}

.dropdown-menu a:first-child {
  border-radius: 4px 4px 0 0;
}

.dropdown-menu a:last-child {
  border-radius: 0 0 4px 4px;
}

.dropdown-menu a:hover {
  background-color: var(--bg-light);
  color: var(--primary-color);
}

.dropdown-menu a.active {
  background-color: var(--primary-light);
  color: var(--bg-white);
}

/* Mobile: Keep JavaScript control with .show class */
@media (max-width: 600px) {
  .dropdown-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    position: static;
    box-shadow: none;
    border-radius: 0;
  }
}

/* ===================================
   Hero Section
   =================================== */
.hero {
  background: linear-gradient(
    135deg,
    var(--primary-color) 0%,
    var(--primary-light) 100%
  );
  color: var(--bg-white);
  padding: var(--spacing-xl) 0;
}

.hero-wrapper {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
  max-width: 1200px;
  margin: 0 auto;
}

.hero-image {
  flex: 0 0 300px;
}

.hero-image img {
  width: 100%;
  height: auto;
  border-radius: 50%;
  border: 6px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
  transition: transform 0.3s ease;
}

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

.hero-content {
  flex: 1;
  text-align: left;
}

.hero-content h2 {
  color: var(--bg-white);
  font-size: 3rem;
  margin-bottom: var(--spacing-sm);
}

.hero-content .lead {
  font-size: 1.3rem;
  margin-bottom: var(--spacing-sm);
  font-weight: 300;
  color: var(--bg-light);
}

.hero-description {
  color: rgba(255, 255, 255, 0.9);
  font-size: 1.1rem;
  margin-bottom: var(--spacing-md);
  line-height: 1.6;
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.btn-primary,
.btn-secondary {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-md);
  margin: var(--spacing-xs);
  border-radius: 50px;
  font-weight: 600;
  transition: all 0.3s ease;
  cursor: pointer;
}

.btn-primary {
  background-color: var(--accent-color);
  color: var(--bg-white);
  border: 2px solid var(--accent-color);
}

.btn-primary:hover {
  background-color: transparent;
  color: var(--accent-color);
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(243, 156, 18, 0.3);
}

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

.btn-secondary:hover {
  background-color: var(--bg-white);
  color: var(--primary-color);
  transform: translateY(-2px);
}

.page-header {
  background: linear-gradient(
    135deg,
    var(--primary-color) 0%,
    var(--primary-light) 100%
  );
  color: var(--bg-white);
  padding: var(--spacing-lg) 0;
  text-align: center;
}

.page-header h2 {
  color: var(--bg-white);
  margin-bottom: var(--spacing-xs);
}

.page-header p {
  color: var(--bg-light);
  font-size: 1.1rem;
}

/* Section Header - Reusable centered title and description */
.section-header {
  text-align: center;
}

.page-header .section-header h2 {
  color: var(--bg-white);
  font-size: 2rem;
  margin-bottom: var(--spacing-xs);
}

.page-header .section-header p {
  color: var(--bg-light);
  font-size: 1.1rem;
}

.hero .section-header h2 {
  color: var(--bg-white);
  font-size: 3rem;
  margin-bottom: var(--spacing-sm);
}

.hero .section-header p {
  color: var(--bg-light);
  font-size: 1.5rem;
  font-weight: 300;
}

section {
  padding: var(--spacing-lg) 0;
}

.content-section {
  background-color: transparent;
}

.content-section h2 {
  text-align: center;
}

.about-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.about-card {
  background-color: var(--bg-white);
  padding: var(--spacing-md);
  border-radius: 8px;
  border-left: 4px solid var(--primary-color);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

.about-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 5px 15px rgba(36, 88, 148, 0.2);
}

.about-card h3 {
  color: var(--primary-color);
  font-size: 1.2rem;
  margin-bottom: var(--spacing-xs);
}

.about-card p {
  margin-bottom: var(--spacing-xs);
}

.links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.link-card {
  background-color: var(--bg-light);
  padding: var(--spacing-md);
  border-radius: 8px;
  transition: all 0.3s ease;
  border: 2px solid transparent;
}

.link-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(36, 88, 148, 0.2);
  border-color: var(--primary-color);
}

.link-card h3 {
  color: var(--primary-color);
  margin-bottom: var(--spacing-xs);
}

.skills-category {
  margin-bottom: var(--spacing-lg);
}

.skills-category h3 {
  color: var(--primary-color);
  border-bottom: 3px solid var(--primary-color);
  padding-bottom: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-md);
}

.skills-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-md);
}

.skill-bar {
  background-color: var(--bg-light);
  height: 12px;
  border-radius: 20px;
  overflow: hidden;
  margin-bottom: var(--spacing-xs);
}

.skill-progress {
  background: linear-gradient(
    90deg,
    var(--primary-color),
    var(--primary-light)
  );
  height: 100%;
  border-radius: 20px;
  transition: width 1s ease;
}

/* Common Grid Layouts */
.grid-auto-250 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.grid-auto-280 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

/* Common Card Styles */
.card-light {
  background-color: var(--bg-light);
  padding: var(--spacing-md);
  border-radius: 8px;
}

.card-white {
  background-color: var(--bg-white);
  padding: var(--spacing-md);
  border-radius: 8px;
}

.card-border-top {
  border-top: 4px solid var(--primary-color);
}

.card-border-left {
  border-left: 4px solid var(--primary-color);
}

.card-border {
  border: 2px solid var(--border-color);
  transition: all 0.3s ease;
}

.card-border:hover {
  border-color: var(--primary-color);
  box-shadow: 0 5px 15px rgba(36, 88, 148, 0.15);
}

.card-title-primary h4,
.card-title-primary h5 {
  color: var(--primary-color);
}

/* Legacy class names for compatibility */
.sfia-cards,
.soft-skills {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.sfia-card {
  background-color: var(--bg-light);
  padding: var(--spacing-sm);
  border-radius: 8px;
  border-top: 4px solid var(--primary-color);
}

.sfia-card h4 {
  color: var(--primary-color);
}

.sfia-level {
  font-weight: 600;
  color: var(--accent-color);
  margin-bottom: var(--spacing-xs);
}

.soft-skill-card {
  background-color: var(--bg-white);
  padding: var(--spacing-md);
  border-radius: 8px;
  border: 2px solid var(--border-color);
  transition: all 0.3s ease;
  text-align: center;
}

.soft-skill-card .skill-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--spacing-sm);
  display: block;
  filter: opacity(0.8);
  transition: transform 0.3s ease, filter 0.3s ease;
}

.soft-skill-card:hover .skill-icon {
  transform: scale(1.1);
  filter: opacity(1);
}

.soft-skill-card h4 {
  color: var(--primary-color);
  margin-bottom: var(--spacing-xs);
}

.soft-skill-card:hover {
  border-color: var(--primary-color);
  box-shadow: 0 5px 15px rgba(36, 88, 148, 0.15);
}

.project-filters {
  text-align: center;
  margin-bottom: var(--spacing-lg);
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

/* Portfolio Layout with Sidebar */
.portfolio-container {
  display: flex;
  gap: var(--spacing-lg);
}

.portfolio-container {
  display: flex;
  gap: var(--spacing-lg);
}

.portfolio-sidebar {
  flex: 0 0 200px;
  background-color: var(--bg-white);
  padding: var(--spacing-md);
  border-radius: 12px;
  border: 1px solid var(--border-color);
  height: fit-content;
  position: sticky;
  top: 100px;
}

.portfolio-sidebar h3 {
  color: var(--primary-color);
  margin-bottom: var(--spacing-md);
  font-size: 1.2rem;
  font-weight: 700;
}

.filter-nav {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

/* PC Sidebar Filter Buttons */
.filter-nav .filter-btn {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: 8px;
  border: 2px solid var(--border-color);
  background-color: var(--bg-white);
  text-transform: none;
  font-size: 0.9rem;
  font-weight: 500;
  text-align: left;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  letter-spacing: 0;
  transition: all 0.3s ease;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  user-select: none;
  cursor: pointer;
}

.filter-nav .filter-btn:hover {
  background-color: var(--primary-light);
  color: var(--bg-white);
  border-color: var(--primary-light);
  transform: translateX(4px);
}

.filter-nav .filter-btn.active {
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--primary-light)
  );
  color: var(--bg-white);
  border-color: var(--primary-color);
  box-shadow: 0 4px 12px rgba(36, 88, 148, 0.3);
}

.filter-icon {
  font-size: 1.1rem;
  display: inline-block;
  min-width: 20px;
  text-align: center;
}

.portfolio-main {
  flex: 1;
  min-width: 0;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-lg);
}

.project-card {
  background-color: var(--bg-white);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
  transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  border: 1px solid rgba(36, 88, 148, 0.1);
  position: relative;
}

.project-card:hover {
  transform: translateY(-10px) scale(1.02);
  box-shadow: 0 15px 40px rgba(36, 88, 148, 0.2);
  border-color: var(--primary-light);
}

.project-image {
  width: 100%;
  height: 220px;
  overflow: hidden;
  background: linear-gradient(135deg, var(--bg-light), var(--primary-light));
  position: relative;
}

.project-image::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    135deg,
    rgba(36, 88, 148, 0.1),
    rgba(243, 156, 18, 0.1)
  );
  opacity: 0;
  transition: opacity 0.3s ease;
}

.project-card:hover .project-image::after {
  opacity: 1;
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.project-card:hover .project-image img {
  transform: scale(1.15) rotate(1deg);
}

.project-info {
  padding: var(--spacing-lg);
}

.project-info h3 {
  color: var(--primary-color);
  margin-top: 0;
  margin-bottom: var(--spacing-xs);
  font-size: 1.4rem;
}

.project-category {
  color: var(--accent-color);
  font-weight: 700;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: var(--spacing-sm);
}

.project-info p {
  color: var(--text-dark);
  line-height: 1.6;
  margin-bottom: var(--spacing-md);
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
}

.tech-tag {
  display: inline-block;
  background: linear-gradient(
    135deg,
    var(--primary-light),
    var(--primary-color)
  );
  color: var(--bg-white);
  padding: 0.35rem 0.9rem;
  border-radius: 25px;
  font-size: 0.8rem;
  font-weight: 600;
  transition: all 0.3s ease;
}

.tech-tag:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(36, 88, 148, 0.3);
}

.project-link {
  display: inline-block;
  color: var(--primary-color);
  font-weight: 700;
  text-decoration: none;
  padding: 0.6rem 1.2rem;
  border: 2px solid var(--primary-color);
  border-radius: 50px;
  transition: all 0.3s ease;
  margin-top: var(--spacing-sm);
}

.project-link:hover {
  background-color: var(--primary-color);
  color: var(--bg-white);
  transform: translateX(5px);
}

.timeline {
  position: relative;
  padding: var(--spacing-sm) 0;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 2px;
  height: 100%;
  background-color: var(--primary-color);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
}

.timeline-item:nth-child(odd) {
  flex-direction: row-reverse;
}

.timeline-marker {
  width: 20px;
  height: 20px;
  background-color: var(--primary-color);
  border: 4px solid var(--bg-white);
  border-radius: 50%;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  box-shadow: 0 0 0 4px var(--bg-light);
}

.timeline-content {
  width: 45%;
  background-color: var(--bg-white);
  padding: var(--spacing-sm);
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.timeline-date {
  color: var(--primary-color);
  font-weight: 700;
  font-size: 1.1rem;
  display: block;
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.cert-card {
  background-color: var(--bg-light);
  padding: var(--spacing-md);
  border-radius: 8px;
  border-left: 4px solid var(--accent-color);
  position: relative;
}

.cert-year {
  position: absolute;
  top: var(--spacing-sm);
  right: var(--spacing-sm);
  background-color: var(--primary-color);
  color: var(--bg-white);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.achievement-image {
  margin-top: var(--spacing-lg);
  text-align: center;
}

.achievement-image img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  max-height: 200px; /* Limit the height to make it smaller */
}

.stat-card {
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--primary-light)
  );
  color: var(--bg-white);
  padding: var(--spacing-sm);
  border-radius: 8px;
  text-align: center;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  display: block;
  font-family: var(--font-heading);
}

.stat-card p {
  color: var(--bg-white);
}

.vision-statement {
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--primary-light)
  );
  color: var(--bg-white);
  padding: var(--spacing-lg);
  border-radius: 8px;
  margin-bottom: var(--spacing-lg);
  text-align: center;
}

.vision-statement h3 {
  color: var(--bg-white);
}

.vision-statement p {
  color: var(--bg-light);
  font-size: 1.1rem;
}

.goal-period h4 {
  color: var(--primary-color);
  border-bottom: 2px solid var(--primary-color);
  padding-bottom: var(--spacing-xs);
}

.goals-grid,
.learning-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-md);
}

.learning-grid {
  margin-top: var(--spacing-md);
}

.learning-image {
  margin-top: var(--spacing-lg);
  text-align: center;
}

.learning-image img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  max-height: 200px; /* Limit the height to make it smaller */
}

.goal-card {
  background-color: var(--bg-light);
  padding: var(--spacing-md);
  border-radius: 8px;
  border-top: 4px solid var(--accent-color);
}

.goal-card h5 {
  color: var(--primary-color);
}

.learning-card {
  background-color: var(--bg-white);
  padding: var(--spacing-md);
  border-radius: 8px;
  border: 2px solid var(--border-color);
}

.learning-card h4 {
  color: var(--primary-color);
}

.company-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--spacing-md);
}

.company-values {
  background-color: var(--bg-light);
  padding: var(--spacing-md);
  border-radius: 8px;
}

.company-values h4 {
  color: var(--primary-color);
}

.company-values ul {
  list-style: none;
}

.company-values li {
  margin-bottom: var(--spacing-sm);
  padding-left: var(--spacing-sm);
  border-left: 3px solid var(--accent-color);
}

.role-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
}

.role-card {
  background-color: var(--bg-light);
  padding: var(--spacing-md);
  border-radius: 8px;
  text-align: center;
}

.role-card h4,
.experience-card h4 {
  color: var(--primary-color);
}

.experience-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.experience-card,
.internship-project {
  background-color: var(--bg-light);
  padding: var(--spacing-md);
  border-radius: 8px;
}

.internship-project {
  margin-bottom: var(--spacing-md);
  border-left: 4px solid var(--primary-color);
}

.project-image {
  margin-top: var(--spacing-md);
  margin-bottom: 0;
  text-align: center;
  display: block;
}

.project-image img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  max-height: 220px;
  vertical-align: top;
}

blockquote {
  background-color: var(--bg-light);
  padding: var(--spacing-md);
  border-left: 4px solid var(--primary-color);
  border-radius: 8px;
  font-style: italic;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--spacing-lg);
}

.contact-method {
  background-color: var(--bg-light);
  padding: var(--spacing-sm);
  border-radius: 8px;
  margin-bottom: var(--spacing-sm);
}

.contact-method h4 {
  color: var(--primary-color);
}

.social-icons {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.social-link {
  background-color: var(--primary-color);
  color: var(--bg-white);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: 50px;
  transition: all 0.3s ease;
  font-weight: 500;
}

.social-link:hover {
  background-color: var(--primary-dark);
  transform: translateY(-2px);
}

.contact-form {
  background-color: var(--bg-light);
  padding: var(--spacing-md);
  border-radius: 8px;
}

.form-group {
  margin-bottom: var(--spacing-sm);
}

.form-group label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
  color: var(--text-dark);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-xs);
  border: 2px solid var(--border-color);
  border-radius: 4px;
  font-family: var(--font-body);
  font-size: 1rem;
  transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
}

.error-message {
  color: var(--error-color);
  font-size: 0.85rem;
  margin-top: var(--spacing-xs);
  display: block;
}

.btn-submit {
  background-color: var(--primary-color);
  color: var(--bg-white);
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  width: 100%;
}

.btn-submit:hover {
  background-color: var(--primary-dark);
  transform: translateY(-2px);
}

.form-feedback {
  margin-top: var(--spacing-sm);
  padding: var(--spacing-sm);
  border-radius: 4px;
  text-align: center;
}

.form-feedback.success {
  background-color: #d4edda;
  color: #155724;
}

footer {
  background-color: var(--text-dark);
  color: var(--bg-light);
  padding: var(--spacing-sm) 0;
  margin-top: var(--spacing-lg);
}

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

.footer-content p {
  margin: 0;
  color: var(--bg-light);
  font-size: 0.9rem;
}

@media (max-width: 960px) {
  nav ul {
    flex-wrap: wrap;
    gap: var(--spacing-sm);
  }

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

  .skills-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .timeline::before {
    left: 20px;
  }

  .timeline-item {
    flex-direction: row !important;
  }

  .timeline-marker {
    left: 20px;
    transform: none;
  }

  .timeline-content {
    width: calc(100% - 50px);
    margin-left: 50px;
  }

  /* Portfolio - Tablet adjustments (600px-960px) */
  .portfolio-container {
    flex-direction: column;
  }

  .portfolio-sidebar {
    flex: none;
    position: static;
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    width: 100%;
    box-sizing: border-box;
    border-radius: 8px;
  }

  .portfolio-sidebar h3 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.1rem;
  }

  .filter-nav {
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
  }

  .filter-nav .filter-btn {
    flex: 0 1 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.9rem;
  }

  .projects-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  }
}

/* Mobile-specific styles */
@media (max-width: 600px) {
  h1 {
    font-size: 2rem;
  }
  h2 {
    font-size: 1.75rem;
  }

  .hero-content h2 {
    font-size: 2rem;
  }

  /* Carousel adjustments for mobile */
  .carousel-container {
    overflow: hidden;
    position: relative;
    margin: 0 auto;
  }

  .carousel-wrapper {
    overflow: hidden;
    border-radius: 8px;
  }

  .carousel-track {
    display: flex;
    transition: transform 0.5s ease-in-out;
  }

  .carousel-item {
    min-width: 100%;
    box-sizing: border-box;
  }

  .carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.8);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
  }

  .prev-btn {
    left: 10px;
  }

  .next-btn {
    right: 10px;
  }

  .carousel-indicators {
    display: flex;
    justify-content: center;
    margin-top: 15px;
    gap: 8px;
  }

  .indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: #ccc;
    cursor: pointer;
    transition: background-color 0.3s ease;
  }

  .indicator.active {
    background-color: var(--primary-color);
  }

  /* Show hamburger menu on mobile */
  .hamburger {
    display: flex;
  }

  /* Mobile navigation - side drawer style */
  nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: transparent;
    pointer-events: none;
    z-index: 999;
  }

  nav.active {
    pointer-events: auto;
  }

  /* Overlay backdrop */
  nav.active::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: -1;
  }

  nav ul {
    position: fixed;
    top: 0;
    left: 0;
    width: 80%;
    max-width: 280px;
    height: 100vh;
    flex-direction: column;
    background-color: var(--bg-white);
    box-shadow: 2px 0 15px rgba(0, 0, 0, 0.2);
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    padding-top: 60px;
    overflow-y: auto;
    gap: 0;
  }

  nav.active ul {
    transform: translateX(0);
  }

  nav li {
    width: 100%;
    border-bottom: 1px solid var(--bg-light);
    margin: 0;
  }

  nav li:last-child {
    border-bottom: none;
  }

  nav a {
    display: block;
    padding: 16px 20px;
    width: 100%;
    color: var(--text-dark);
    font-size: 1rem;
    border-radius: 0;
    background-color: transparent;
  }

  nav a:hover,
  nav a.active {
    background-color: var(--primary-light);
    color: var(--bg-white);
    border-left: 4px solid var(--accent-color);
    padding-left: 16px;
  }

  .dropdown {
    width: 100%;
  }

  .dropbtn {
    width: 100%;
    padding: 16px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    text-align: left;
    color: var(--text-dark);
    font-size: 1rem;
    border-radius: 0;
    background-color: transparent;
  }

  .dropbtn::after {
    content: "▾";
    font-size: 0.8rem;
    transition: transform 0.3s ease;
  }

  /* Show arrow rotated when dropdown is open */
  .dropdown-menu.show ~ .dropbtn::after {
    transform: rotate(180deg);
  }

  /* Dropdown menu behavior on mobile */
  .dropdown-menu {
    position: static;
    box-shadow: none;
    background-color: #f0f5ff;
    border-left: 0;
    margin: 0;
    padding: 0;
    opacity: 0;
    visibility: hidden;
    max-height: 0;
    overflow: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease, max-height 0.3s ease;
  }

  /* Show dropdown with class */
  .dropdown-menu.show {
    opacity: 1;
    visibility: visible;
    max-height: 500px;
  }

  /* Dropdown controlled by JavaScript on mobile */
  .dropdown-menu a {
    padding: 12px 20px;
    padding-left: 40px;
    border-radius: 0;
    color: var(--text-dark);
    font-size: 0.95rem;
  }

  .dropdown-menu a:hover {
    background-color: #e6eef7;
    border-left: none;
    color: var(--primary-color);
    padding-left: 40px;
  }

  .dropdown-menu a:first-child,
  .dropdown-menu a:last-child {
    border-radius: 0;
  }

  .links-grid,
  .skills-grid,
  .skills-grid-4,
  .projects-grid {
    grid-template-columns: 1fr;
  }

  /* Adjust project card for better mobile display */
  .project-card {
    margin: 0 10px;
  }

  .card-content {
    padding: var(--spacing-md);
  }

  .project-desc {
    font-size: 0.9rem;
    line-height: 1.5;
  }

  .tech-stack {
    margin-top: var(--spacing-sm);
  }

  .tech {
    font-size: 0.8rem;
    padding: 4px 8px;
  }

  /* Portfolio - Mobile adjustments (≤600px) */
  .portfolio-container {
    flex-direction: column;
  }

  .portfolio-main {
    width: 100%;
    box-sizing: border-box;
  }

  .portfolio-sidebar {
    position: relative;
    padding: 0;
    margin-bottom: var(--spacing-md);
    background-color: transparent;
    border: none;
    border-radius: 0;
    width: 100%;
    box-sizing: border-box;
    order: -1;
  }

  .portfolio-sidebar h3 {
    display: none;
  }

  /* Mobile Tab-style filter bar */
  .filter-nav {
    flex-direction: row;
    gap: 0;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    scroll-behavior: smooth;
    padding: var(--spacing-sm) 0;
    border-bottom: 2px solid var(--border-color);
    background-color: var(--bg-white);
  }

  /* Ensure carousel is responsive on mobile */
  .carousel-container {
    max-width: 100%;
    margin: 0 auto var(--spacing-md);
  }

  .carousel-wrapper {
    max-width: 100%;
  }

  .carousel-item {
    padding: 0 5px;
  }

  .project-card {
    margin: 0;
    width: 100%;
    box-sizing: border-box;
  }

  .card-image {
    height: 150px;
    overflow: hidden;
    border-radius: 8px 8px 0 0;
  }

  .card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }

  .filter-nav .filter-btn {
    flex: 0 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.8rem;
    border: none;
    border-bottom: 3px solid transparent;
    background-color: transparent;
    border-radius: 0;
    white-space: nowrap;
    color: var(--text-dark);
    transition: all 0.3s ease;
  }

  .filter-nav .filter-btn:hover {
    color: var(--primary-color);
    background-color: transparent;
    transform: none;
    border-color: transparent;
  }

  .filter-nav .filter-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    background: none;
    box-shadow: none;
  }

  .filter-icon {
    font-size: 1rem;
    margin-right: 4px;
  }

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

/* ===================================
   Gallery Styles (migrated from gallery.css)
   =================================== */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.gallery-item {
  position: relative;
  overflow: hidden;
  border-radius: 8px;
  cursor: pointer;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

.gallery-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.gallery-item img {
  width: 100%;
  height: 250px;
  object-fit: cover;
  display: block;
  transition: transform 0.3s ease;
}

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

.gallery-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(36, 88, 148, 0.9), transparent);
  color: white;
  padding: 1.5rem 1rem 1rem;
  transform: translateY(100%);
  transition: transform 0.3s ease;
}

.gallery-item:hover .gallery-overlay {
  transform: translateY(0);
}

.gallery-overlay p {
  margin: 0;
  color: white;
  font-weight: 600;
  font-size: 1.1rem;
}

/* Lightbox Styles */

.lightbox {
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  position: fixed;
  z-index: 2147483646; /* very high to sit above other UI like header/nav */
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
  box-sizing: border-box;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}

.lightbox.active {
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
}

.lightbox-inner {
  width: 100%;
  max-width: 1100px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

/* 微调：将灯箱整体向下偏移一点以改善视觉位置 */
.lightbox-inner {
  transform: translateY(4vh);
  transition: transform 0.25s ease;
}

.lightbox-media {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-content {
  display: block;
  max-width: 80%;
  max-height: 75vh;
  opacity: 0;
  transform: scale(0.98);
  transition: opacity 0.35s ease, transform 0.35s ease;
  object-fit: contain;
  border-radius: 4px;
  box-shadow: 0 5px 25px rgba(0, 0, 0, 0.5);
}

.lightbox-content.loaded {
  opacity: 1;
  transform: scale(1);
}

@keyframes zoom {
  from {
    transform: scale(0.8);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

.lightbox-caption {
  margin: 20px auto 0;
  display: block;
  max-width: 80%;
  text-align: center;
  color: #ccc;
  padding: 10px 0;
  font-size: 1.2rem;
}

.lightbox-index {
  position: absolute;
  top: 18px;
  left: 50%;
  transform: translateX(-50%);
  color: #e6eef7;
  font-weight: 600;
  background: rgba(0,0,0,0.35);
  padding: 6px 10px;
  border-radius: 20px;
  font-size: 0.95rem;
  z-index: 2147483648;
  pointer-events: none;
}

.close-lightbox {
  position: absolute;
  top: 20px;
  right: 30px;
  color: #f1f1f1;
  font-size: 50px;
  font-weight: bold;
  transition: 0.3s;
  cursor: pointer;
  z-index: 10001;
  background-color: rgba(0, 0, 0, 0.5);
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  backdrop-filter: blur(5px);
}

.close-lightbox:hover,
.close-lightbox:focus {
  color: #f39c12;
  background-color: rgba(0, 0, 0, 0.7);
  transform: scale(1.1);
}

.prev-btn,
.next-btn {
  cursor: pointer;
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: auto;
  padding: 16px 20px;
  color: white;
  font-weight: bold;
  font-size: 30px;
  transition: 0.3s;
  border-radius: 4px;
  user-select: none;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 10001;
  backdrop-filter: blur(5px);
}

.prev-btn {
  left: 30px;
  border-radius: 4px;
}

.next-btn {
  right: 30px;
  border-radius: 4px;
}

.prev-btn:hover,
.next-btn:hover {
  background-color: rgba(36, 88, 148, 0.9);
  transform: scale(1.1);
}

@media (max-width: 768px) {
  .lightbox {
    padding: 20px;
  }

  .lightbox-content {
    max-width: 90%;
    max-height: 60vh;
  }

  .close-lightbox {
    top: 10px;
    right: 10px;
    font-size: 35px;
    width: 50px;
    height: 50px;
  }

  .prev-btn,
  .next-btn {
    font-size: 20px;
    padding: 10px 12px;
  }

  .prev-btn {
    left: 10px;
  }

  .next-btn {
    right: 10px;
  }

  .lightbox-caption {
    max-width: 95%;
    font-size: 1rem;
    margin-top: 15px;
  }

  /* 移动端微调：向下偏移较小 */
  .lightbox-inner {
    transform: translateY(2vh);
  }
}

@media (max-width: 480px) {
  .lightbox {
    padding: 15px;
  }

  .lightbox-content {
    max-width: 95%;
    max-height: 50vh;
  }

  .close-lightbox {
    top: 5px;
    right: 5px;
    font-size: 30px;
    width: 40px;
    height: 40px;
  }

  .prev-btn,
  .next-btn {
    font-size: 18px;
    padding: 8px 10px;
  }

  .prev-btn {
    left: 5px;
  }

  .next-btn {
    right: 5px;
  }

  .lightbox-caption {
    font-size: 0.9rem;
    margin-top: 10px;
  }
}

/* ===================================
   Portfolio Styles - Modern Design
   =================================== */

/* Portfolio Carousel Styles */
.carousel-container {
  position: relative;
  max-width: 900px;
  margin: 0 auto var(--spacing-xl);
  padding: 0 70px;
}

.carousel-wrapper {
  overflow: hidden;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.carousel-track {
  display: flex;
  transition: transform 0.5s ease-in-out;
}

.carousel-item {
  min-width: 100%;
  flex-shrink: 0;
}

.carousel-item .project-card {
  margin: 0;
  height: auto;
  min-height: 500px;
}

.carousel-item .project-card:hover {
  transform: none;
}

.carousel-item .card-image {
  height: 300px;
}

.carousel-item .card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background-color: var(--primary-color);
  color: var(--bg-white);
  border: none;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  font-size: 1.5rem;
  cursor: pointer;
  transition: all 0.3s ease;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
  line-height: 1;
}

.carousel-btn:hover {
  background-color: var(--primary-dark);
  transform: translateY(-50%) scale(1.1);
}

.carousel-btn:active {
  transform: translateY(-50%) scale(0.95);
}

.prev-btn {
  left: 0;
}

.next-btn {
  right: 0;
}

.carousel-indicators {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: var(--spacing-md);
}

.indicator {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--border-color);
  cursor: pointer;
  transition: all 0.3s ease;
}

.indicator.active {
  background-color: var(--primary-color);
  width: 30px;
  border-radius: 6px;
}

.indicator:hover {
  background-color: var(--primary-light);
}

.portfolio-filter-bar {
  background-color: var(--bg-white);
  padding: var(--spacing-lg) 0;
  margin-bottom: var(--spacing-xl);
  border-bottom: 2px solid var(--primary-light);
}

.filter-title {
  color: var(--primary-color);
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  display: none;
}

.filter-chips {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
  justify-content: center;
}

.filter-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 2px solid var(--border-color);
  background-color: var(--bg-white);
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-dark);
}

.filter-chip:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
  transform: translateY(-2px);
}

.filter-chip.active {
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--primary-light)
  );
  border-color: var(--primary-color);
  color: var(--bg-white);
  box-shadow: 0 4px 15px rgba(36, 88, 148, 0.3);
}

.chip-icon {
  font-size: 1.1rem;
  display: inline-block;
}

.chip-text {
  display: none;
}

/* Projects Container */
.projects-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-lg);
  animation: fadeIn 0.5s ease;
}

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

/* Project Card */
.project-card {
  background-color: var(--bg-white);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  transition: all 0.4s cubic-bezier(0.23, 1, 0.32, 1);
  border: 1px solid rgba(36, 88, 148, 0.05);
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 30px rgba(36, 88, 148, 0.15);
  border-color: var(--primary-light);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-md) 0;
}

.category-badge {
  background: linear-gradient(
    135deg,
    var(--primary-light),
    rgba(36, 88, 148, 0.6)
  );
  color: var(--bg-white);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.project-icon {
  font-size: 1.5rem;
}

/* Card Image */
.card-image {
  position: relative;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, var(--bg-light), var(--primary-light));
}

.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

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

.image-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(36, 88, 148, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.project-card:hover .image-overlay {
  opacity: 1;
}

.view-btn {
  background-color: var(--accent-color);
  color: var(--bg-white);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  display: inline-block;
}

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

/* Card Content */
.card-content {
  padding: var(--spacing-sm);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.card-content h3 {
  color: var(--primary-color);
  font-size: 1.2rem;
  margin: 0 0 var(--spacing-xs) 0;
  font-weight: 700;
}

.project-desc {
  color: var(--text-dark);
  font-size: 0.9rem;
  line-height: 1.5;
  margin: 0 0 var(--spacing-sm) 0;
  flex: 1;
}

/* Tech Stack */
.tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
}

.tech {
  display: inline-block;
  background-color: var(--bg-light);
  color: var(--primary-color);
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 600;
}

/* PC: Show title and text */
@media (min-width: 961px) {
  .filter-title {
    display: block;
  }

  .filter-chips {
    justify-content: flex-start;
  }

  .chip-text {
    display: inline;
  }

  .projects-container {
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  }
}

/* Mobile Responsive */
@media (max-width: 600px) {
  .portfolio-filter-bar {
    padding: var(--spacing-md) 0;
    margin-bottom: var(--spacing-lg);
  }

  .filter-chips {
    gap: var(--spacing-xs);
    justify-content: space-between;
  }

  .filter-chip {
    flex: 1;
    padding: var(--spacing-sm);
    border-radius: 8px;
  }

  .chip-icon {
    font-size: 1rem;
  }

  .projects-container {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .card-header {
    padding: var(--spacing-sm) var(--spacing-sm) 0;
  }

  .category-badge {
    font-size: 0.7rem;
  }

  .card-content {
    padding: var(--spacing-sm);
  }

  .card-content h3 {
    font-size: 1.1rem;
  }

  .project-desc {
    font-size: 0.85rem;
  }
}