/* ========================================
   Portfolio — Bright Glassmorphism Design
   ======================================== */

/* ---------- Fonts ---------- */
/* ✅ 아래에 원하는 폰트를 넣으세요 (Google Fonts 등) */
/* @import url('https://fonts.googleapis.com/css2?family=여기에+폰트명&display=swap'); */

/* ---------- Design Tokens ---------- */
:root {
  /* ✅ Main: 제목, 강조용 폰트 / Sub: 본문, 일반 텍스트용 폰트 */
  --font-main: 'font/woff/Pretendard-ExtraBold.woff';  /* 예: 'Pretendard', 'Noto Sans KR' */
  --font-sub: 'font/woff/Pretendard-ExtraBold.woff';   /* 예: 'Inter', 'Noto Sans KR' */

  /* Colors — Monochrome + Point */
  --bg-gradient-1: #FFFAFF;
  --bg-gradient-2: #f7f7f8;
  --bg-gradient-3: #FFFAFF;
  --bg-gradient-4: #f7f7f8;

  --text-primary: #050401;
  --text-secondary: #303036;
  --text-muted: #8a8a90;

  --accent: #30BCED;
  --accent-light: #5ccdf2;
  --accent-glow: rgba(48, 188, 237, 0.2);
  --point: #FC5130;

  /* Glass */
  --glass-bg: rgba(255, 255, 255, 0.92);
  --glass-bg-hover: rgba(255, 255, 255, 0.98);
  --glass-border: rgba(0, 0, 0, 0.06);
  --glass-shadow: 0 2px 16px rgba(5, 4, 1, 0.05);
  --glass-shadow-hover: 0 6px 28px rgba(5, 4, 1, 0.09);
  --glass-blur: 18px;

  /* Spacing */
  --section-padding: 100px 0;
  --container-max: 1200px;
  --card-radius: 20px;
  --radius-sm: 12px;
  --radius-xs: 8px;

  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-sub), -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
  background: linear-gradient(
    135deg,
    var(--bg-gradient-1) 0%,
    var(--bg-gradient-2) 35%,
    var(--bg-gradient-3) 65%,
    var(--bg-gradient-4) 100%
  );
  background-attachment: fixed;
  overflow-x: hidden;
}

/* Animated background blobs */
body::before,
body::after {
  content: "";
  position: fixed;
  border-radius: 50%;
  z-index: -1;
  filter: blur(100px);
  opacity: 0.12;
  animation: blobFloat 20s ease-in-out infinite alternate;
}

body::before {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, #30BCED 0%, transparent 70%);
  top: -200px;
  right: -200px;
}

body::after {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, #FC5130 0%, transparent 70%);
  bottom: -150px;
  left: -150px;
  animation-delay: -10s;
}

@keyframes blobFloat {
  0% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(-60px, 40px) scale(1.1);
  }
  100% {
    transform: translate(30px, -30px) scale(0.95);
  }
}

/* ---------- Container ---------- */
.container {
  width: 90%;
  max-width: var(--container-max);
  margin: 0 auto;
}

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

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

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

.navbar-brand {
  font-family: var(--font-main), sans-serif;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--accent);
  background: none;
  -webkit-background-clip: unset;
  -webkit-text-fill-color: unset;
  background-clip: unset;
  text-decoration: none;
  letter-spacing: -0.5px;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 8px;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.92rem;
  padding: 8px 18px;
  border-radius: var(--radius-xs);
  transition: var(--transition-fast);
  position: relative;
}

.nav-links a:hover {
  color: var(--accent);
  background: rgba(48, 188, 237, 0.08);
}

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

.menu-toggle span {
  width: 24px;
  height: 2.5px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition-fast);
}

/* ---------- Hero Section ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 0 80px;
  position: relative;
}

.hero-content {
  max-width: 700px;
}

.hero-badge {
  display: inline-block;
  padding: 8px 20px;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: 50px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 28px;
  animation: fadeInUp 0.8s ease-out;
}

.hero h1 {
  font-family: var(--font-main), sans-serif;
  font-size: clamp(2.8rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1.5px;
  margin-bottom: 20px;
  animation: fadeInUp 0.8s ease-out 0.15s both;
}

.hero h1 .gradient-text {
  color: var(--accent);
}

.hero p {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 auto 36px;
  animation: fadeInUp 0.8s ease-out 0.3s both;
}

.hero-buttons {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease-out 0.45s both;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 30px;
  border-radius: 50px;
  font-family: inherit;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: var(--transition);
}

.btn-primary {
  background: #FC5130;
  color: #FFFAFF;
  box-shadow: 0 4px 16px rgba(252, 81, 48, 0.2);
}

.btn-primary:hover {
  transform: translateY(-2px);
  background: #e03e1f;
  box-shadow: 0 8px 24px rgba(252, 81, 48, 0.35);
}

.btn-glass {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
}

.btn-glass:hover {
  background: var(--glass-bg-hover);
  transform: translateY(-2px);
  box-shadow: var(--glass-shadow-hover);
}

/* ---------- Sections ---------- */
section {
  padding: var(--section-padding);
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-header h2 {
  font-family: var(--font-main), sans-serif;
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 14px;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 550px;
  margin: 0 auto;
}

/* ---------- About Section ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.about-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--card-radius);
  padding: 40px;
  box-shadow: var(--glass-shadow);
}

.about-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: #FC5130;
}

.about-card p {
  color: var(--text-secondary);
  line-height: 1.8;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.stat-item {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 28px 20px;
  text-align: center;
  box-shadow: var(--glass-shadow);
  transition: var(--transition);
}

.stat-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--glass-shadow-hover);
}

.stat-number {
  font-size: 2rem;
  font-weight: 800;
  color: #FC5130;
}

.stat-label {
  font-size: 0.88rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-top: 4px;
}

/* ---------- Projects Section ---------- */
#projects {
  padding-bottom: 120px;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 28px;
}

.project-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--card-radius);
  overflow: hidden;
  box-shadow: var(--glass-shadow);
  transition: var(--transition);
  text-decoration: none;
  color: inherit;
  display: block;
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--glass-shadow-hover);
  background: var(--glass-bg-hover);
}

.project-card-image {
  width: 100%;
  height: 220px;
  object-fit: cover;
  background: linear-gradient(
    135deg,
    var(--bg-gradient-1),
    var(--bg-gradient-3)
  );
  position: relative;
  overflow: hidden;
}

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

.project-card:hover .project-card-image img {
  transform: scale(1.06);
}

/* Placeholder when no image */
.project-card-image .placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  background: #f2f2f3;
  color: var(--accent-light);
}

.project-card-body {
  padding: 24px;
}

.project-card-body h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.3px;
}

.project-card-body p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.6;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.project-tag {
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 0.78rem;
  font-weight: 600;
  background: rgba(48, 188, 237, 0.08);
  color: var(--accent);
  border: 1px solid rgba(48, 188, 237, 0.2);
}

.project-links {
  display: flex;
  gap: 12px;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
  padding: 6px 14px;
  border-radius: var(--radius-xs);
  transition: var(--transition-fast);
}

.project-link:hover {
  background: rgba(48, 188, 237, 0.08);
}

/* ---------- Skills Section ---------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.skill-category {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--card-radius);
  padding: 32px;
  box-shadow: var(--glass-shadow);
  transition: var(--transition);
}

.skill-category:hover {
  transform: translateY(-4px);
  box-shadow: var(--glass-shadow-hover);
}

.skill-category-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.skill-category h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.skill-tag {
  padding: 6px 14px;
  border-radius: 50px;
  font-size: 0.82rem;
  font-weight: 500;
  background: rgba(0, 0, 0, 0.04);
  color: #303036;
  border: 1px solid rgba(0, 0, 0, 0.08);
  transition: var(--transition-fast);
}

.skill-tag:hover {
  background: rgba(48, 188, 237, 0.12);
  color: var(--accent);
  transform: translateY(-2px);
}

/* ---------- Contact Section ---------- */
.contact-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--card-radius);
  padding: 50px;
  box-shadow: var(--glass-shadow);
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.contact-card h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.contact-card p {
  color: var(--text-secondary);
  margin-bottom: 30px;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 50px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.92rem;
  transition: var(--transition);
}

.contact-link:hover {
  background: #FC5130;
  color: #FFFAFF;
  border-color: #FC5130;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(252, 81, 48, 0.25);
}

/* ---------- Footer ---------- */
.footer {
  text-align: center;
  padding: 40px 0;
  color: var(--text-muted);
  font-size: 0.88rem;
}

/* ---------- Scroll Animations ---------- */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity 0.7s ease-out,
    transform 0.7s ease-out;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered cards */
.project-card.fade-in {
  transition-delay: calc(var(--card-index, 0) * 0.08s);
}

/* ---------- Keyframes ---------- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

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

  section {
    padding: 70px 0;
  }
}

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

  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 75%;
    max-width: 320px;
    height: 100vh;
    flex-direction: column;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    padding: 80px 32px 32px;
    gap: 4px;
    transition: var(--transition);
    box-shadow: -8px 0 32px rgba(0, 0, 0, 0.1);
  }

  .nav-links.active {
    right: 0;
  }

  .nav-links a {
    font-size: 1.05rem;
    padding: 14px 18px;
    border-radius: var(--radius-sm);
  }

  .hero h1 {
    font-size: 2.3rem;
  }

  .contact-card {
    padding: 32px 24px;
  }

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

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

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

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

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

/* Mobile overlay */
.nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.3);
  z-index: 999;
  opacity: 0;
  transition: var(--transition);
}

.nav-overlay.active {
  display: block;
  opacity: 1;
}