:root {
  --bg-color: #050811;
  --card-bg: rgba(13, 20, 38, 0.65);
  --card-nested-bg: rgba(9, 14, 28, 0.75);
  --card-border: rgba(255, 255, 255, 0.08);
  --card-border-hover: rgba(99, 102, 241, 0.45);
  
  --accent-cyan: #06b6d4;
  --accent-indigo: #6366f1;
  --accent-purple: #a855f7;
  --accent-pink: #ec4899;
  
  --accent-gradient: linear-gradient(135deg, #06b6d4 0%, #6366f1 50%, #a855f7 100%);
  --neon-border: linear-gradient(135deg, rgba(6, 182, 212, 0.6), rgba(168, 85, 247, 0.6));
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-light: #64748b;
  
  --font-main: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-display: 'Outfit', var(--font-main);
  --transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: var(--font-main); }
html { scroll-behavior: smooth; scroll-padding-top: 95px; }
body { background-color: var(--bg-color); color: var(--text-main); line-height: 1.65; overflow-x: hidden; position: relative; min-height: 100vh; }

/* Aurora Background */
.ambient-glow { position: fixed; border-radius: 50%; filter: blur(140px); pointer-events: none; z-index: 0; opacity: 0.35; animation: floatGlow 18s ease-in-out infinite alternate; }
.glow-top-left { top: -100px; left: -100px; width: 500px; height: 500px; background: radial-gradient(circle, #6366f1, #3b82f6); }
.glow-middle-right { top: 35%; right: -150px; width: 550px; height: 550px; background: radial-gradient(circle, #a855f7, #ec4899); animation-delay: -6s; }
.glow-bottom-left { bottom: -150px; left: 20%; width: 600px; height: 600px; background: radial-gradient(circle, #06b6d4, #6366f1); animation-delay: -12s; }
@keyframes floatGlow { 0% { transform: translate(0, 0) scale(1); } 50% { transform: translate(40px, 60px) scale(1.1); } 100% { transform: translate(-30px, -40px) scale(0.95); } }

/* Global Loader */
.global-loader { position: fixed; inset: 0; width: 100vw; height: 100vh; background: rgba(5, 8, 17, 0.92); backdrop-filter: blur(16px); display: flex; align-items: center; justify-content: center; z-index: 99999; opacity: 0; pointer-events: none; transition: opacity 0.3s ease; }
.global-loader.show { opacity: 1; pointer-events: auto; }
.loader-content { display: flex; flex-direction: column; align-items: center; gap: 20px; }
.loader-ring { padding: 8px; border-radius: 50%; background: var(--accent-gradient); box-shadow: 0 0 35px rgba(99, 102, 241, 0.5); animation: pulseGlow 2s infinite alternate; }
.loader-gif { width: 90px; height: 90px; border-radius: 50%; object-fit: cover; display: block; background: #000; }
@keyframes pulseGlow { 0% { transform: scale(0.96); } 100% { transform: scale(1.04); box-shadow: 0 0 40px rgba(168, 85, 247, 0.7); } }
.loader-text { font-size: 0.98rem; font-weight: 700; background: var(--accent-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }

/* Navbar */
.navbar { position: fixed; top: 0; left: 0; width: 100%; height: 76px; background: rgba(8, 12, 24, 0.75); backdrop-filter: blur(20px); border-bottom: 1px solid var(--card-border); z-index: 1000; }
.nav-container { max-width: 1180px; height: 100%; margin: 0 auto; padding: 0 28px; display: flex; justify-content: space-between; align-items: center; }
.nav-logo { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.logo-dot { width: 10px; height: 10px; border-radius: 50%; background: #10b981; box-shadow: 0 0 12px #10b981; }
.logo-text { font-family: var(--font-display); font-size: 1.35rem; font-weight: 900; background: var(--accent-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.nav-menu { display: flex; align-items: center; gap: 28px; }
.nav-link { color: var(--text-muted); text-decoration: none; font-size: 0.95rem; font-weight: 600; transition: var(--transition); position: relative; padding: 6px 0; }
.nav-link:hover, .nav-link.active { color: #fff; }
.nav-link.active::after { content: ''; position: absolute; bottom: -4px; left: 0; width: 100%; height: 2px; background: var(--accent-gradient); box-shadow: 0 0 10px rgba(99, 102, 241, 0.8); }

/* Dropdown */
.nav-dropdown { position: relative; }
.nav-dropdown-btn { background: rgba(255, 255, 255, 0.05); border: 1px solid var(--card-border); color: var(--text-muted); font-size: 0.92rem; font-weight: 600; cursor: pointer; display: flex; align-items: center; gap: 8px; padding: 8px 16px; border-radius: 100px; transition: var(--transition); }
.nav-dropdown-btn:hover, .nav-dropdown.open .nav-dropdown-btn { color: #fff; background: rgba(99, 102, 241, 0.15); border-color: var(--accent-indigo); }
.dropdown-arrow { font-size: 0.7rem; transition: transform 0.3s ease; }
.nav-dropdown.open .dropdown-arrow { transform: rotate(180deg); }
.dropdown-menu { position: absolute; top: calc(100% + 14px); right: 0; width: 320px; max-height: 460px; overflow-y: auto; background: rgba(11, 16, 33, 0.95); backdrop-filter: blur(24px); border: 1px solid rgba(255, 255, 255, 0.12); border-radius: 20px; padding: 16px; box-shadow: 0 24px 50px rgba(0, 0, 0, 0.7); display: none; flex-direction: column; gap: 12px; z-index: 1001; }
.nav-dropdown.open .dropdown-menu { display: flex; animation: dropdownPop 0.25s ease forwards; }
@keyframes dropdownPop { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }
.dropdown-group { display: flex; flex-direction: column; gap: 4px; padding-bottom: 12px; border-bottom: 1px solid rgba(255, 255, 255, 0.06); }
.dropdown-group:last-child { border-bottom: none; }
.dropdown-company-link { display: flex; align-items: center; gap: 10px; color: #c7d2fe; font-size: 0.92rem; font-weight: 700; text-decoration: none; padding: 8px 12px; border-radius: 10px; background: rgba(255, 255, 255, 0.03); }
.dropdown-company-link:hover { background: rgba(99, 102, 241, 0.2); color: #fff; }
.dropdown-project-list { display: flex; flex-direction: column; padding-left: 14px; gap: 3px; margin-top: 4px; }
.dropdown-project-link { display: flex; align-items: center; gap: 8px; color: var(--text-muted); font-size: 0.84rem; text-decoration: none; padding: 6px 10px; border-radius: 8px; }
.dropdown-project-link:hover { background: rgba(255, 255, 255, 0.06); color: #38bdf8; transform: translateX(4px); }
.hamburger { display: none; background: none; border: none; color: #fff; font-size: 1.4rem; cursor: pointer; }

/* Main Layout */
.main-container { max-width: 1180px; margin: 0 auto; padding: 120px 28px 80px; position: relative; z-index: 1; }
.section { padding: 60px 0; }
.section-badge { display: inline-flex; align-items: center; gap: 8px; padding: 6px 16px; background: rgba(99, 102, 241, 0.12); border: 1px solid rgba(99, 102, 241, 0.4); border-radius: 100px; color: #a5b4fc; font-family: var(--font-display); font-size: 0.8rem; font-weight: 800; letter-spacing: 1px; margin-bottom: 14px; }
.section-title { font-size: 2.3rem; font-weight: 900; margin-bottom: 8px; color: #fff; letter-spacing: -0.5px; }
.section-desc { color: var(--text-muted); margin-bottom: 40px; font-size: 1.02rem; }

/* Profile Card */
.profile-card { background: var(--card-bg); backdrop-filter: blur(24px); border: 1px solid var(--card-border); border-radius: 32px; padding: 48px; display: grid; grid-template-columns: 320px 1fr; gap: 48px; align-items: center; box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4); transition: var(--transition); }
.profile-card:hover { border-color: var(--card-border-hover); box-shadow: 0 30px 70px rgba(99, 102, 241, 0.15); }
.profile-img-wrap { width: 100%; height: 360px; border-radius: 24px; overflow: hidden; padding: 4px; background: var(--neon-border); }
.profile-img-wrap img { width: 100%; height: 100%; object-fit: cover; border-radius: 20px; display: block; }
.profile-info { display: flex; flex-direction: column; }
.profile-header-row { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; margin-bottom: 12px; }
.profile-name { font-family: var(--font-display); font-size: 2.8rem; font-weight: 900; color: #fff; }
.status-badge { display: inline-flex; align-items: center; gap: 8px; padding: 6px 14px; background: rgba(16, 185, 129, 0.12); border: 1px solid rgba(16, 185, 129, 0.35); border-radius: 100px; color: #34d399; font-size: 0.82rem; font-weight: 700; }
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: #10b981; box-shadow: 0 0 8px #10b981; }
.profile-bio { font-size: 1.12rem; color: var(--text-muted); line-height: 1.8; margin-bottom: 28px; }
.info-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px 24px; padding-top: 24px; border-top: 1px solid rgba(255, 255, 255, 0.08); }
.info-item { display: flex; align-items: center; gap: 12px; padding: 10px 14px; background: rgba(255, 255, 255, 0.025); border: 1px solid rgba(255, 255, 255, 0.04); border-radius: 14px; font-size: 0.94rem; }
.info-icon { width: 32px; height: 32px; border-radius: 10px; background: rgba(99, 102, 241, 0.15); color: #818cf8; display: flex; align-items: center; justify-content: center; }
.info-label { color: var(--text-light); font-weight: 600; }
.info-value { color: var(--text-main); font-weight: 600; margin-left: auto; }

/* Skills Section */
.skills-wrapper { display: flex; flex-direction: column; gap: 36px; }
.skill-category-block { display: flex; flex-direction: column; gap: 18px; }
.skill-category-title { font-family: var(--font-display); font-size: 1.25rem; font-weight: 800; color: #cbd5e1; display: flex; align-items: center; gap: 10px; }
.skill-category-title i { color: #818cf8; }
.skills-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(270px, 1fr)); gap: 20px; }
.skill-card { background: var(--card-bg); backdrop-filter: blur(20px); border: 1px solid var(--card-border); border-radius: 20px; padding: 22px; display: flex; align-items: flex-start; gap: 16px; transition: var(--transition); }
.skill-card:hover { transform: translateY(-4px); border-color: rgba(99, 102, 241, 0.45); box-shadow: 0 16px 36px rgba(0, 0, 0, 0.4), 0 0 20px rgba(99, 102, 241, 0.2); }
.skill-icon-box { width: 48px; height: 48px; border-radius: 14px; background: rgba(99, 102, 241, 0.12); border: 1px solid rgba(99, 102, 241, 0.3); display: flex; align-items: center; justify-content: center; font-size: 1.5rem; color: #818cf8; flex-shrink: 0; }
.skill-icon-box img { width: 28px; height: 28px; object-fit: contain; }
.skill-card.cert-card .skill-icon-box { background: rgba(245, 158, 11, 0.12); border-color: rgba(245, 158, 11, 0.35); color: #fbbf24; }
.skill-details { display: flex; flex-direction: column; gap: 4px; flex: 1; }
.skill-header-row { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.skill-name { font-size: 1.05rem; font-weight: 800; color: #fff; }
.skill-tag { font-size: 0.72rem; font-weight: 700; padding: 2px 8px; border-radius: 100px; background: rgba(255, 255, 255, 0.06); color: var(--text-muted); }
.skill-card.cert-card .skill-tag { background: rgba(245, 158, 11, 0.15); color: #fbbf24; }
.skill-desc { font-size: 0.85rem; color: var(--text-muted); line-height: 1.5; }

/* Company Stack & Logo */
.company-stack { display: flex; flex-direction: column; gap: 52px; }
.company-block { background: var(--card-bg); backdrop-filter: blur(24px); border: 1px solid var(--card-border); border-radius: 28px; padding: 40px; box-shadow: 0 20px 45px rgba(0, 0, 0, 0.35); scroll-margin-top: 95px; }
.company-header-card { display: grid; grid-template-columns: 160px 1fr; gap: 32px; padding-bottom: 32px; border-bottom: 1px solid rgba(255, 255, 255, 0.08); }
.comp-img-wrap { width: 100%; height: 160px; border-radius: 18px; overflow: hidden; border: 1px solid rgba(255, 255, 255, 0.12); }
.comp-img-wrap img { width: 100%; height: 100%; object-fit: cover; }
.comp-info { display: flex; flex-direction: column; justify-content: center; }

.comp-title-row { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; flex-wrap: wrap; gap: 12px; }
.comp-title-left { display: flex; align-items: center; gap: 12px; }

/* Company Logo Style */
.comp-logo-img {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  object-fit: contain;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  padding: 4px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.comp-name { font-family: var(--font-display); font-size: 1.8rem; font-weight: 800; color: #fff; }
.comp-period { font-size: 0.85rem; font-weight: 600; padding: 6px 14px; background: rgba(255, 255, 255, 0.06); border-radius: 100px; color: var(--text-muted); }
.comp-role { display: inline-flex; align-items: center; gap: 8px; color: #38bdf8; font-size: 1.05rem; font-weight: 700; margin-bottom: 12px; }
.comp-desc { color: var(--text-muted); font-size: 0.98rem; }

/* Sub-projects */
.nested-projects-wrapper { margin-top: 32px; }
.nested-projects-title { font-size: 1.15rem; font-weight: 800; color: #e2e8f0; margin-bottom: 24px; display: flex; align-items: center; gap: 10px; }
.project-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 28px; }
.project-card { background: var(--card-nested-bg); border: 1px solid rgba(255, 255, 255, 0.07); border-radius: 20px; overflow: hidden; display: flex; flex-direction: column; transition: var(--transition); scroll-margin-top: 105px; }
.project-card:hover { transform: translateY(-6px); border-color: rgba(168, 85, 247, 0.5); box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5), 0 0 24px rgba(168, 85, 247, 0.2); }
.project-img-wrap { width: 100%; height: 200px; overflow: hidden; }
.project-img-wrap img { width: 100%; height: 100%; object-fit: cover; }
.project-body { padding: 24px; display: flex; flex-direction: column; flex: 1; }
.project-period { font-size: 0.82rem; font-weight: 600; color: var(--accent-cyan); margin-bottom: 8px; }
.project-name { font-size: 1.25rem; font-weight: 800; margin-bottom: 12px; color: #fff; }
.project-desc { color: var(--text-muted); font-size: 0.92rem; margin-bottom: 22px; flex: 1; }
.project-btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 10px 18px; background: var(--accent-gradient); color: #fff; text-decoration: none; font-size: 0.88rem; font-weight: 700; border-radius: 12px; }

/* Footer */
.footer { text-align: center; padding: 60px 28px; border-top: 1px solid var(--card-border); background: rgba(5, 8, 17, 0.8); }
.footer-title { font-family: var(--font-display); font-size: 1.2rem; font-weight: 800; background: var(--accent-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; margin-bottom: 8px; }
.footer-copy { color: var(--text-light); font-size: 0.85rem; }

@media (max-width: 890px) {
  .profile-card { grid-template-columns: 1fr; padding: 32px; }
  .profile-img-wrap { height: 300px; }
  .company-header-card { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .hamburger { display: block; }
  .nav-menu { position: absolute; top: 76px; left: 0; width: 100%; max-height: calc(100vh - 76px); overflow-y: auto; background: rgba(8, 12, 24, 0.98); flex-direction: column; align-items: flex-start; padding: 24px 28px; transform: translateY(-150%); transition: var(--transition); gap: 20px; }
  .nav-menu.open { transform: translateY(0); }
  .nav-dropdown { width: 100%; }
  .nav-dropdown-btn { width: 100%; justify-content: space-between; }
  .dropdown-menu { position: static; width: 100%; margin-top: 10px; }
  .info-grid { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: 1fr; }
}