/* ===== NEXON Lv1 Gothic Font ===== */
@font-face {
  font-family: "NexonLv1Gothic";
  src: url("https://cdn.jsdelivr.net/gh/projectnoonnu/noonfonts_20-04@2.1/NEXON Lv1 Gothic OTF Light.woff")
    format("woff");
  font-weight: 300;
  font-display: swap;
}

@font-face {
  font-family: "NexonLv1Gothic";
  src: url("https://cdn.jsdelivr.net/gh/projectnoonnu/noonfonts_20-04@2.1/NEXON Lv1 Gothic OTF.woff")
    format("woff");
  font-weight: normal;
  font-display: swap;
}

@font-face {
  font-family: "NexonLv1Gothic";
  src: url("https://cdn.jsdelivr.net/gh/projectnoonnu/noonfonts_20-04@2.1/NEXON Lv1 Gothic OTF Bold.woff")
    format("woff");
  font-weight: 700;
  font-display: swap;
}

/* ===== Pretendard Font ===== */
@font-face {
  font-family: "Pretendard";
  src: url("https://cdn.jsdelivr.net/gh/Project-Noonnu/noonfonts_2107@1.1/Pretendard-Thin.woff")
    format("woff");
  font-weight: 100;
  font-display: swap;
}

@font-face {
  font-family: "Pretendard";
  src: url("https://cdn.jsdelivr.net/gh/Project-Noonnu/noonfonts_2107@1.1/Pretendard-ExtraLight.woff")
    format("woff");
  font-weight: 200;
  font-display: swap;
}

@font-face {
  font-family: "Pretendard";
  src: url("https://cdn.jsdelivr.net/gh/Project-Noonnu/noonfonts_2107@1.1/Pretendard-Light.woff")
    format("woff");
  font-weight: 300;
  font-display: swap;
}

@font-face {
  font-family: "Pretendard";
  src: url("https://cdn.jsdelivr.net/gh/Project-Noonnu/noonfonts_2107@1.1/Pretendard-Regular.woff")
    format("woff");
  font-weight: 400;
  font-display: swap;
}

@font-face {
  font-family: "Pretendard";
  src: url("https://cdn.jsdelivr.net/gh/Project-Noonnu/noonfonts_2107@1.1/Pretendard-Medium.woff")
    format("woff");
  font-weight: 500;
  font-display: swap;
}

@font-face {
  font-family: "Pretendard";
  src: url("https://cdn.jsdelivr.net/gh/Project-Noonnu/noonfonts_2107@1.1/Pretendard-SemiBold.woff")
    format("woff");
  font-weight: 600;
  font-display: swap;
}

@font-face {
  font-family: "Pretendard";
  src: url("https://cdn.jsdelivr.net/gh/Project-Noonnu/noonfonts_2107@1.1/Pretendard-Bold.woff")
    format("woff");
  font-weight: 700;
  font-display: swap;
}

@font-face {
  font-family: "Pretendard";
  src: url("https://cdn.jsdelivr.net/gh/Project-Noonnu/noonfonts_2107@1.1/Pretendard-ExtraBold.woff")
    format("woff");
  font-weight: 800;
  font-display: swap;
}

@font-face {
  font-family: "Pretendard";
  src: url("https://cdn.jsdelivr.net/gh/Project-Noonnu/noonfonts_2107@1.1/Pretendard-Black.woff")
    format("woff");
  font-weight: 900;
  font-display: swap;
}

/* ===== Reset & Base Styles ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary-color: #6366f1;
  --secondary-color: #8b5cf6;
  --accent-color: #ec4899;
  --text-dark: #0f172a;
  --text-light: #64748b;
  --bg-light: #f8fafc;
  --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --white: #ffffff;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1),
    0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1),
    0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1),
    0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
  font-family: "Pretendard", -apple-system, BlinkMacSystemFont, system-ui,
    Roboto, "Helvetica Neue", "Segoe UI", "Apple SD Gothic Neo", "Noto Sans KR",
    "Malgun Gothic", sans-serif;
  line-height: 1.7;
  color: var(--text-dark);
  overflow-x: hidden;
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

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

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

/* ===== Navigation ===== */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: white;
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  z-index: 1000;
  transition: var(--transition);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 20px;
}

.logo a {
  font-family: Pretendard;
  font-size: 1.5rem;
  font-weight: 900 !important;
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--secondary-color),
    var(--accent-color)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  background-size: 200% auto;
  animation: gradientShift 3s ease infinite;
}

@keyframes gradientShift {
  0%,
  100% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-menu a {
  color: var(--text-dark);
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

.nav-menu a::after {
  content: "";
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-color);
  transition: var(--transition);
}

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

.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
}

.hamburger span {
  width: 25px;
  height: 3px;
  background: var(--text-dark);
  margin: 3px 0;
  transition: var(--transition);
}

/* ===== Hero Section ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(-45deg, #667eea, #764ba2, #8b5cf6, #4facfe);
  background-size: 400% 400%;
  animation: gradientAnimation 15s ease infinite;
  color: var(--white);
  text-align: center;
  padding: 100px 20px 50px;
  position: relative;
  overflow: hidden;
}

@keyframes gradientAnimation {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(
      circle at 20% 50%,
      rgba(255, 255, 255, 0.1) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 80% 80%,
      rgba(255, 255, 255, 0.1) 0%,
      transparent 50%
    );
  animation: float 20s ease-in-out infinite;
  pointer-events: none;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-20px);
  }
}

.hero-content {
  max-width: 800px;
  animation: fadeInUp 1s ease;
  position: relative;
  z-index: 1;
}

.hero-title {
  font-family: "NexonLv1Gothic", "Pretendard", sans-serif;
  font-size: 3.5rem;
  margin-bottom: 1rem;
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.highlight {
  background: linear-gradient(135deg, #fbbf24, #f59e0b);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative;
  display: inline-block;
}

.highlight::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, #fbbf24, transparent);
  animation: shimmer 2s ease-in-out infinite;
}

@keyframes shimmer {
  0%,
  100% {
    opacity: 0.5;
    transform: translateX(-100%);
  }
  50% {
    opacity: 1;
    transform: translateX(100%);
  }
}

.hero-subtitle {
  font-size: 1.5rem;
  margin-bottom: 2rem;
  opacity: 0.95;
  font-weight: 300;
  letter-spacing: -0.01em;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-bottom: 2rem;
}

.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "NexonLv1Gothic", "Pretendard", sans-serif;
  padding: 8px 30px;
  border-radius: 50px;
  font-weight: 600;
  transition: var(--transition);
}

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

.btn-primary:hover {
  transform: translateY(-3px);
  background: var(--white);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.1);
  color: var(--white);
  border: 2px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: var(--white);
  color: var(--primary-color);
  border-color: var(--white);
  transform: translateY(-3px);
}

.social-links {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  font-size: 1.5rem;
}

.social-links a {
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  transition: var(--transition);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.social-links a:hover {
  background: var(--white);
  color: var(--primary-color);
  transform: translateY(-5px) scale(1.1);
  border-color: var(--white);
}

.scroll-indicator {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
}

.scroll-indicator span {
  display: block;
  width: 20px;
  height: 30px;
  border: 2px solid var(--white);
  border-radius: 15px;
  position: relative;
}

.scroll-indicator span::before {
  content: "";
  position: absolute;
  top: 5px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 8px;
  background: var(--white);
  border-radius: 2px;
  animation: scroll 2s infinite;
}

@keyframes scroll {
  0%,
  100% {
    opacity: 0;
    top: 5px;
  }
  50% {
    opacity: 1;
    top: 15px;
  }
}

/* ===== Section Styles ===== */
.section-title {
  font-family: "NexonLv1Gothic", "Pretendard", sans-serif;
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
  position: relative;
  padding-bottom: 1rem;
}

.section-title::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background: linear-gradient(
    90deg,
    var(--primary-color),
    var(--secondary-color),
    var(--accent-color)
  );
  border-radius: 2px;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.6;
  }
}

/* ===== Skills Section ===== */
.skills {
  padding: 80px 20px;
  background: var(--bg-light);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2rem;
  max-width: 900px;
  margin: 0 auto;
}

.skill-card {
  background: var(--white);
  padding: 2rem;
  border-radius: 20px;
  text-align: center;
  transition: var(--transition-slow);
  position: relative;
  overflow: hidden;
}

.skill-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border-radius: 20px;
  background: linear-gradient(
    135deg,
    rgba(99, 102, 241, 0.15),
    rgba(139, 92, 246, 0.15),
    rgba(236, 72, 153, 0.15)
  );
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: 0;
}

.skill-card > * {
  position: relative;
  z-index: 1;
}

.skill-card:hover {
  transform: translateY(-10px);
}

.skill-card:hover::before {
  opacity: 1;
}

.skill-card i {
  font-size: 3rem;
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--secondary-color)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
  transition: var(--transition);
}

.skill-card:hover i {
  transform: scale(1.1) rotate(5deg);
}

.skill-card h3 {
  font-family: "NexonLv1Gothic", "Pretendard", sans-serif;
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

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

/* ===== Projects Section ===== */
.featured-projects {
  padding: 80px 20px;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

.project-card {
  background: var(--white);
  border-radius: 20px;
  overflow: hidden;
  transition: var(--transition-slow);
  border: 1px solid rgba(0, 0, 0, 0.05);
}

.project-card:hover {
  transform: translateY(-10px) scale(1.02);
  border-color: rgba(99, 102, 241, 0.2);
}

.project-image {
  position: relative;
  overflow: hidden;
  height: 250px;
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

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

.project-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    135deg,
    rgba(99, 102, 241, 0.95),
    rgba(139, 92, 246, 0.95)
  );
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  opacity: 0;
  transition: var(--transition);
  backdrop-filter: blur(10px);
}

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

.project-label {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  padding: 0;
  background: transparent;
  color: var(--white);
  border-radius: 999px;
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.4px;
  text-shadow: 0 6px 20px rgba(15, 23, 42, 0.4);
  transition: opacity 0.3s ease, transform 0.3s ease;
  pointer-events: none;
  z-index: 1;
}

.project-card:hover .project-label {
  opacity: 0;
  transform: translate(-50%, -60%);
}

.overlay-btn {
  width: 50px;
  height: 50px;
  background: var(--white);
  color: var(--primary-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: var(--transition);
}

.overlay-btn:hover {
  transform: scale(1.1);
}

.project-info {
  padding: 1.5rem;
}

.project-info h3 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.project-info p {
  color: var(--text-light);
  margin-bottom: 1rem;
  line-height: 1.5;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 1rem;
}

.tag {
  padding: 5px 14px;
  background: linear-gradient(
    135deg,
    rgba(99, 102, 241, 0.1),
    rgba(139, 92, 246, 0.1)
  );
  color: var(--primary-color);
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  border: 1px solid rgba(99, 102, 241, 0.2);
  transition: var(--transition);
}

.tag:hover {
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--secondary-color)
  );
  color: var(--white);
  transform: translateY(-2px);
}

.project-link {
  color: var(--primary-color);
  font-weight: 600;
  transition: var(--transition);
}

.project-link:hover {
  text-decoration: underline;
}

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

/* ===== Toast Message ===== */
.toast-message {
  position: fixed;
  bottom: 110px;
  left: 50%;
  transform: translate(-50%, 20px);
  background: rgba(17, 24, 39, 0.92);
  color: var(--white);
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.2);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
  z-index: 1000;
  font-weight: 600;
  letter-spacing: 0.3px;
}

.toast-message.visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

/* ===== Page Hero ===== */
.page-hero {
  padding: 150px 20px 80px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: var(--white);
  text-align: center;
}

.page-hero h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
}

/* ===== About Page ===== */
.about-content {
  padding: 80px 20px;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 3rem;
  align-items: start;
}

.about-image img {
  border-radius: 15px;
}

.about-text h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.about-text p {
  color: var(--text-light);
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: 2rem;
}

.stat {
  text-align: center;
  padding: 1.5rem;
  background: var(--bg-light);
  border-radius: 10px;
}

.stat h3 {
  font-size: 2.5rem;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
}

.stat p {
  color: var(--text-light);
  font-size: 1rem;
}

/* ===== Experience Section ===== */
.experience {
  padding: 80px 20px;
  background: var(--bg-light);
}

.timeline {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--primary-color);
}

.timeline-item {
  position: relative;
  padding-left: 60px;
  margin-bottom: 3rem;
}

.timeline-dot {
  position: absolute;
  left: 11px;
  top: 0;
  width: 20px;
  height: 20px;
  background: var(--primary-color);
  border-radius: 50%;
  border: 4px solid var(--white);
}

.timeline-content h3 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.timeline-date {
  color: var(--text-light);
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

/* ===== Contact Section ===== */
.contact {
  padding: 80px 20px;
}

.contact-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  max-width: 900px;
  margin: 0 auto;
}

.contact-item {
  text-align: center;
  padding: 2rem;
  background: var(--bg-light);
  border-radius: 15px;
  transition: var(--transition);
}

.contact-item:hover {
  transform: translateY(-5px);
}

.contact-item i {
  font-size: 2.5rem;
  color: var(--primary-color);
  margin-bottom: 1rem;
}

.contact-item h3 {
  margin-bottom: 0.5rem;
}

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

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

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

/* ===== Filter Section ===== */
.filter-section {
  padding: 40px 20px;
  background: var(--bg-light);
}

.filter-buttons {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.filter-btn {
  padding: 10px 25px;
  background: var(--white);
  border: 2px solid var(--primary-color);
  color: var(--primary-color);
  border-radius: 25px;
  cursor: pointer;
  font-weight: 600;
  transition: var(--transition);
}

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

/* ===== Projects Section (Projects Page) ===== */
.projects-section {
  padding: 80px 20px;
}

/* ===== Footer ===== */
.footer {
  background: var(--text-dark);
  color: var(--white);
  padding: 2rem 20px;
  text-align: center;
}

.footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-links {
  display: flex;
  gap: 2rem;
}

.footer-links a {
  color: var(--white);
  transition: var(--transition);
}

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

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

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    left: -100%;
    top: 70px;
    flex-direction: column;
    background: var(--white);
    width: 100%;
    text-align: center;
    transition: var(--transition);
    padding: 2rem 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
  }

  .nav-menu.active {
    left: 0;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-subtitle {
    font-size: 1.2rem;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .section-title {
    font-size: 2rem;
  }

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

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

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

  .footer .container {
    flex-direction: column;
    text-align: center;
  }

  .page-hero h1 {
    font-size: 2rem;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }

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

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