/* ==========================================================================
   Modern Portfolio & Introduction Webpage Stylesheet
   Theme: Adaptive Dark & Light Modes with Glassmorphism & Vibrant Gradients
   ========================================================================== */

/* --- CSS Variables & Design Tokens --- */
:root {
  /* Dark Theme Tokens (Default) */
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-tertiary: #1f2937;
  --bg-card: rgba(17, 24, 39, 0.75);
  --bg-glass: rgba(255, 255, 255, 0.04);
  --border-color: rgba(255, 255, 255, 0.1);
  --border-focus: #6366f1;

  --text-primary: #f9fafb;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;

  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-light: rgba(99, 102, 241, 0.15);
  
  --accent-cyan: #06b6d4;
  --accent-purple: #a855f7;
  --accent-rose: #f43f5e;
  --accent-green: #10b981;

  --gradient-brand: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #06b6d4 100%);
  --gradient-glow: radial-gradient(circle, rgba(99, 102, 241, 0.25) 0%, rgba(0, 0, 0, 0) 70%);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 36px rgba(0, 0, 0, 0.5);
  --shadow-primary: 0 8px 25px rgba(99, 102, 241, 0.35);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);

  --nav-height: 72px;
}

/* Light Theme Tokens */
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-glass: rgba(0, 0, 0, 0.03);
  --border-color: rgba(0, 0, 0, 0.08);
  --border-focus: #4f46e5;

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

  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-light: rgba(79, 70, 229, 0.1);

  --gradient-glow: radial-gradient(circle, rgba(99, 102, 241, 0.12) 0%, rgba(0, 0, 0, 0) 70%);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 16px 36px rgba(15, 23, 42, 0.12);
  --shadow-primary: 0 8px 25px rgba(79, 70, 229, 0.25);
}

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

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

body {
  font-family: 'Outfit', 'Noto Sans KR', sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-fast);
}

ul {
  list-style: none;
}

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

button, input, textarea {
  font-family: inherit;
  border: none;
  outline: none;
  background: none;
}

/* --- Layout Utility --- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 100px 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
  position: relative;
}

.section-subtitle {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.875rem;
  letter-spacing: 2px;
  color: var(--primary);
  text-transform: uppercase;
  font-weight: 600;
  display: block;
  margin-bottom: 8px;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.section-line {
  width: 60px;
  height: 4px;
  background: var(--gradient-brand);
  margin: 0 auto;
  border-radius: var(--radius-full);
}

/* Gradient Text */
.gradient-text {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

/* --- Scroll Progress Bar --- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: var(--gradient-brand);
  z-index: 1001;
  transition: width 0.1s linear;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
}

.btn-primary {
  background: var(--gradient-brand);
  color: #ffffff;
  box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(99, 102, 241, 0.45);
  color: #ffffff;
}

.btn-outline {
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-primary);
  backdrop-filter: blur(8px);
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
}

.btn-block {
  width: 100%;
}

/* --- Header & Navigation --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  background: transparent;
  backdrop-filter: blur(0px);
  z-index: 1000;
  transition: all var(--transition-normal);
}

.header.scrolled {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  font-size: 1.35rem;
  color: var(--text-primary);
}

.logo-symbol {
  font-family: 'JetBrains Mono', monospace;
  color: var(--primary);
  background: var(--primary-light);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  font-size: 1.1rem;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--primary);
  transition: width var(--transition-fast);
  border-radius: var(--radius-full);
}

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

.nav-link.active::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  cursor: pointer;
  font-size: 1.1rem;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  color: var(--primary);
  border-color: var(--primary);
  transform: rotate(15deg);
}

[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: block; }

.mobile-toggle-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  cursor: pointer;
  z-index: 1002;
}

.hamburger-bar {
  width: 24px;
  height: 2px;
  background-color: var(--text-primary);
  transition: all var(--transition-normal);
  border-radius: var(--radius-full);
}

/* --- Hero Section --- */
.hero-section {
  min-height: 100vh;
  padding: calc(var(--nav-height) + 60px) 0 80px;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero-bg-glow {
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: var(--gradient-glow);
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
}

.glow-1 {
  top: -150px;
  right: -100px;
}

.glow-2 {
  bottom: -200px;
  left: -150px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.2) 0%, rgba(0, 0, 0, 0) 70%);
}

.hero-container {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  border: 1px solid rgba(99, 102, 241, 0.2);
  margin-bottom: 24px;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-green);
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.hero-typing-wrap {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 24px;
  min-height: 40px;
}

.typing-text {
  color: var(--accent-cyan);
}

.cursor {
  display: inline-block;
  background-color: var(--accent-cyan);
  width: 2px;
  animation: blink 1s infinite;
}

@keyframes blink {
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0; }
}

.hero-description {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 36px;
  max-width: 540px;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  margin-bottom: 40px;
}

.hero-socials {
  display: flex;
  align-items: center;
  gap: 14px;
}

.social-label {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 500;
}

.social-link {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 1.1rem;
  transition: all var(--transition-fast);
}

.social-link:hover {
  color: var(--primary);
  border-color: var(--primary);
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
}

/* Avatar Card */
.avatar-card {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.avatar-wrapper {
  width: 340px;
  height: 380px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
  border: 2px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  background: var(--bg-secondary);
}

.avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.avatar-card:hover .avatar-img {
  transform: scale(1.04);
}

.floating-badge {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 18px;
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  animation: float 4s ease-in-out infinite;
}

.badge-top-right {
  top: -20px;
  right: -20px;
  animation-delay: 0s;
}

.badge-bottom-left {
  bottom: -20px;
  left: -20px;
  animation-delay: 2s;
}

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

.badge-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.badge-info {
  display: flex;
  flex-direction: column;
}

.badge-number {
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-primary);
}

.badge-text {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* --- About Me Section --- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  align-items: stretch;
}

.about-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-sm);
}

.about-card-title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--primary);
}

.about-text {
  color: var(--text-secondary);
  font-size: 0.98rem;
  margin-bottom: 16px;
}

.personal-info-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
}

.info-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
}

.info-label {
  font-weight: 600;
  color: var(--text-secondary);
  min-width: 90px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.info-label i {
  color: var(--primary);
}

.info-value {
  color: var(--text-primary);
  font-weight: 500;
}

.about-strengths-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.strength-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: all var(--transition-normal);
}

.strength-card:hover {
  transform: translateY(-5px);
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

.strength-icon {
  width: 46px;
  height: 46px;
  border-radius: var(--radius-md);
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 16px;
}

.strength-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.strength-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --- Skills Section --- */
.skills-filter {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 10px 22px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.filter-btn.active {
  background: var(--gradient-brand);
  color: #ffffff;
  border-color: transparent;
  box-shadow: var(--shadow-primary);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}

.skill-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: all var(--transition-normal);
}

.skill-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

.skill-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}

.skill-icon-wrap {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
}

.js-color { background: rgba(247, 223, 30, 0.15); color: #f7df1e; }
.ts-color { background: rgba(49, 120, 198, 0.15); color: #3178c6; }
.react-color { background: rgba(97, 218, 251, 0.15); color: #61dafb; }
.css-color { background: rgba(56, 189, 248, 0.15); color: #38bdf8; }
.node-color { background: rgba(104, 159, 99, 0.15); color: #68a063; }
.db-color { background: rgba(51, 103, 145, 0.15); color: #336791; }
.git-color { background: rgba(240, 80, 50, 0.15); color: #f05032; }
.figma-color { background: rgba(162, 89, 255, 0.15); color: #a259ff; }

.skill-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.skill-level {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
}

.skill-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.5;
}

.skill-bar-wrap {
  width: 100%;
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.skill-bar {
  height: 100%;
  background: var(--gradient-brand);
  border-radius: var(--radius-full);
  transition: width 1s ease-in-out;
}

/* --- Projects Section --- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 32px;
}

.project-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

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

.project-img-wrapper {
  position: relative;
  width: 100%;
  height: 220px;
  overflow: hidden;
}

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

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

.project-overlay {
  position: absolute;
  top: 14px;
  right: 14px;
}

.project-badge {
  background: var(--primary);
  color: #ffffff;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.project-content {
  padding: 28px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.tag {
  background: var(--bg-tertiary);
  color: var(--primary);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  font-family: 'JetBrains Mono', monospace;
}

.project-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.project-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.6;
}

.project-features {
  margin-bottom: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.project-features li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.project-features i {
  color: var(--accent-green);
  margin-top: 4px;
}

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

/* --- Experience & Timeline Section --- */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  padding: 20px 0;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  left: 20px;
  height: 100%;
  width: 2px;
  background: var(--border-color);
}

.timeline-item {
  position: relative;
  padding-left: 54px;
  margin-bottom: 44px;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-dot {
  position: absolute;
  top: 6px;
  left: 12px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 3px solid var(--primary);
  box-shadow: 0 0 10px rgba(99, 102, 241, 0.5);
  transition: all var(--transition-fast);
}

.timeline-item:hover .timeline-dot {
  background: var(--primary);
  transform: scale(1.2);
}

.timeline-date {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 8px;
}

.timeline-content {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: all var(--transition-normal);
}

.timeline-content:hover {
  border-color: var(--primary);
  transform: translateX(4px);
}

.timeline-badge {
  display: inline-block;
  background: var(--accent-green);
  color: #ffffff;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.timeline-role {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.timeline-company {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: 12px;
}

.timeline-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.timeline-tags span {
  font-size: 0.75rem;
  padding: 2px 8px;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  font-family: 'JetBrains Mono', monospace;
}

/* --- Contact Section --- */
.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 40px;
  align-items: start;
}

.contact-info-card,
.contact-form-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-sm);
}

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

.contact-info-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  line-height: 1.6;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 36px;
}

.contact-detail-item {
  display: flex;
  align-items: center;
  gap: 16px;
}

.contact-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.detail-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  display: block;
}

.detail-link,
.detail-text {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

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

.contact-social-pills {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.social-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.social-pill:hover {
  background: var(--primary-light);
  color: var(--primary);
  border-color: var(--primary);
  transform: translateY(-2px);
}

/* Contact Form Elements */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.required {
  color: var(--accent-rose);
}

.form-group input,
.form-group textarea {
  padding: 14px 18px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}

/* Form Success Notification State */
.form-success-message {
  display: none;
  text-align: center;
  padding: 40px 20px;
}

.form-success-message.active {
  display: block;
}

.success-icon {
  font-size: 3.5rem;
  color: var(--accent-green);
  margin-bottom: 16px;
}

.form-success-message h4 {
  font-size: 1.3rem;
  margin-bottom: 8px;
}

.form-success-message p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 24px;
}

/* --- Footer --- */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 40px 0;
}

.footer-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-logo {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  display: block;
  margin-bottom: 6px;
}

.footer-text {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

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

/* --- Back to Top Button --- */
.back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 46px;
  height: 46px;
  border-radius: var(--radius-full);
  background: var(--primary);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: var(--shadow-primary);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: all var(--transition-normal);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--primary-hover);
  transform: translateY(-4px);
}

/* --- Responsive Media Queries --- */
@media (max-width: 992px) {
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 48px;
  }

  .hero-badge,
  .hero-description {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-buttons {
    justify-content: center;
  }

  .hero-socials {
    justify-content: center;
  }

  .avatar-card {
    margin: 0 auto;
  }

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

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

@media (max-width: 768px) {
  .section {
    padding: 70px 0;
  }

  .section-title {
    font-size: 1.8rem;
  }

  .hero-title {
    font-size: 2.2rem;
  }

  .hero-typing-wrap {
    font-size: 1.15rem;
  }

  .avatar-wrapper {
    width: 280px;
    height: 320px;
  }

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

  .form-row {
    grid-template-columns: 1fr;
  }

  .mobile-toggle-btn {
    display: flex;
  }

  .nav-cta {
    display: none;
  }

  /* Mobile Navigation Drawer */
  .nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    width: 100%;
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    padding: 24px 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal);
  }

  .nav-menu.open {
    max-height: 360px;
    box-shadow: var(--shadow-lg);
  }

  .nav-list {
    flex-direction: column;
    gap: 18px;
  }

  .mobile-toggle-btn.open .hamburger-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .mobile-toggle-btn.open .hamburger-bar:nth-child(2) {
    opacity: 0;
  }

  .mobile-toggle-btn.open .hamburger-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

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

  .floating-badge {
    padding: 8px 12px;
  }

  .badge-icon {
    width: 32px;
    height: 32px;
    font-size: 0.9rem;
  }

  .badge-number {
    font-size: 0.85rem;
  }
}

@media (max-width: 480px) {
  .hero-buttons {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .floating-badge {
    display: none; /* 모바일 초소형 화면에서 가독성 확보 */
  }
}