/* ===== Variables ===== */
:root {
  --bg-dark: #0f0f0f;
  --bg-card: #1a1a1a;
  --text: #e8e6e3;
  --text-muted: #9a9691;
  --accent: #d4a853;
  --accent-hover: #e4bc6a;
  --border: rgba(212, 168, 83, 0.2);
  --font-sans: 'Noto Sans KR', -apple-system, sans-serif;
  --font-display: 'Playfair Display', Georgia, serif;
  --transition: 0.3s ease;
  --radius: 8px;
  --container: min(90vw, 1100px);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-dark);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

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

ul {
  list-style: none;
}

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

/* ===== Header & Nav ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1rem 1.5rem;
  background: rgba(15, 15, 15, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.nav {
  max-width: var(--container);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.35rem;
  letter-spacing: 0.02em;
}

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

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
}

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

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text);
  transition: var(--transition);
}

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: var(--radius);
  transition: var(--transition);
  cursor: pointer;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg-dark);
}

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

.btn-outline {
  border: 2px solid var(--accent);
  color: var(--accent);
}

.btn-outline:hover {
  background: var(--accent);
  color: var(--bg-dark);
}

/* ===== Hero ===== */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 6rem 1.5rem 4rem;
  position: relative;
}

.hero-content {
  max-width: 600px;
}

.hero-greeting {
  font-size: 1rem;
  color: var(--accent);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
  opacity: 0;
  animation: fadeUp 0.8s ease forwards;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 6vw, 3.5rem);
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: 1rem;
  opacity: 0;
  animation: fadeUp 0.8s ease 0.15s forwards;
}

.hero-title .highlight {
  color: var(--accent);
  font-style: italic;
}

.hero-desc {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 2rem;
  opacity: 0;
  animation: fadeUp 0.8s ease 0.3s forwards;
}

.hero .btn {
  opacity: 0;
  animation: fadeUp 0.8s ease 0.45s forwards;
}

.hero-scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  border-radius: 2px;
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; transform: scaleY(0.5); }
  50% { opacity: 1; transform: scaleY(1); }
}

/* ===== Sections common ===== */
section {
  padding: 5rem 1.5rem;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 600;
  margin-bottom: 2.5rem;
  color: var(--text);
}

/* ===== About ===== */
.about {
  background: var(--bg-card);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 3rem;
  align-items: center;
}

.about-image-placeholder {
  aspect-ratio: 4/5;
  background: linear-gradient(135deg, rgba(212, 168, 83, 0.15), rgba(212, 168, 83, 0.05));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

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

.about-text .btn {
  margin-top: 0.5rem;
}

/* ===== Skills ===== */
.skills-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  max-width: 600px;
}

.skill-item {
  display: grid;
  grid-template-columns: 140px 1fr;
  align-items: center;
  gap: 1rem;
}

.skill-name {
  font-weight: 500;
  font-size: 0.95rem;
}

.skill-bar {
  height: 8px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 4px;
  overflow: hidden;
}

.skill-fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  border-radius: 4px;
  transition: width 1s ease;
}

.skill-fill.animated {
  width: var(--level, 0%);
}

/* ===== Projects ===== */
.projects {
  background: var(--bg-card);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 2rem;
}

.project-card {
  background: var(--bg-dark);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
  opacity: 0;
  transform: translateY(24px);
}

.project-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.project-card:hover {
  border-color: rgba(212, 168, 83, 0.4);
  transform: translateY(-4px);
}

.project-image {
  aspect-ratio: 16/10;
  background: linear-gradient(135deg, rgba(212, 168, 83, 0.2), transparent);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.project-info {
  padding: 1.25rem;
}

.project-info h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.project-info p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
  line-height: 1.5;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.project-tags span {
  font-size: 0.75rem;
  padding: 0.25rem 0.5rem;
  background: rgba(212, 168, 83, 0.15);
  color: var(--accent);
  border-radius: 4px;
}

.project-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--accent);
  transition: var(--transition);
}

.project-link:hover {
  color: var(--accent-hover);
}

/* ===== Contact ===== */
.contact-desc {
  color: var(--text-muted);
  margin-bottom: 2rem;
  max-width: 500px;
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: var(--transition);
  min-width: 200px;
}

.contact-item:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.contact-icon {
  font-size: 1.25rem;
  opacity: 0.8;
}

/* ===== Footer ===== */
.footer {
  padding: 1.5rem;
  text-align: center;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.85rem;
}

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

  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 70%;
    max-width: 280px;
    height: 100vh;
    background: var(--bg-card);
    flex-direction: column;
    padding: 5rem 2rem 2rem;
    gap: 1.5rem;
    border-left: 1px solid var(--border);
    transition: right var(--transition);
  }

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

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

  .about-image {
    order: -1;
    max-width: 280px;
    margin: 0 auto;
  }

  .skill-item {
    grid-template-columns: 1fr;
  }

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