/* ===================== 색상/폰트 설정 (전체 디자인은 여기서만 관리) ===================== */
:root {
  --color-bg: #0f1117;
  --color-surface: #171a23;
  --color-text: #e8e9ee;
  --color-text-muted: #9a9db0;
  --color-primary: #5e9cff;
  --color-primary-dark: #3f7ce0;
  --color-border: #2a2e3a;

  --font-base: "Malgun Gothic", "Apple SD Gothic Neo", sans-serif;
  --max-width: 960px;
  --section-padding: 96px 24px;
}
/* ============================================================================== */

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-base);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

h1, h2, h3 {
  line-height: 1.3;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

ul {
  list-style: none;
}

/* ---------- 헤더 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(15, 17, 23, 0.9);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--color-border);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-weight: 700;
  font-size: 20px;
  color: var(--color-text);
}

.nav-links {
  display: flex;
  gap: 28px;
}

.nav-links a {
  color: var(--color-text-muted);
  font-size: 15px;
}

.nav-links a:hover {
  color: var(--color-text);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text);
  font-size: 22px;
  cursor: pointer;
}

/* ---------- Hero ---------- */
.hero {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 140px 24px 96px;
  text-align: center;
}

.hero h1 {
  font-size: 42px;
  margin-bottom: 20px;
}

.accent {
  color: var(--color-primary);
}

.tagline {
  color: var(--color-text-muted);
  font-size: 18px;
  max-width: 560px;
  margin: 0 auto 32px;
}

.cta-button {
  display: inline-block;
  background: var(--color-primary);
  color: #0f1117;
  font-weight: 600;
  padding: 14px 32px;
  border-radius: 999px;
  transition: background 0.2s ease;
}

.cta-button:hover {
  background: var(--color-primary-dark);
}

/* ---------- 공통 섹션 ---------- */
section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--section-padding);
}

section h2 {
  font-size: 30px;
  margin-bottom: 32px;
}

/* ---------- About ---------- */
.about p {
  color: var(--color-text-muted);
  margin-bottom: 16px;
  max-width: 700px;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.skill-tags li {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 14px;
  color: var(--color-text);
}

/* ---------- Projects ---------- */
.project-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.project-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 24px;
}

.project-card h3 {
  font-size: 18px;
  margin-bottom: 10px;
}

.project-card p {
  color: var(--color-text-muted);
  font-size: 14px;
  margin-bottom: 16px;
}

.project-link {
  font-size: 14px;
  font-weight: 600;
}

/* ---------- Contact ---------- */
.contact-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 20px;
  font-size: 16px;
}

/* ---------- Footer ---------- */
.site-footer {
  text-align: center;
  padding: 32px 24px;
  color: var(--color-text-muted);
  font-size: 14px;
  border-top: 1px solid var(--color-border);
}

/* ---------- 반응형 (모바일) ---------- */
@media (max-width: 640px) {
  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    gap: 0;
    display: none;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    padding: 16px 24px;
    border-top: 1px solid var(--color-border);
  }

  .menu-toggle {
    display: block;
  }

  .hero h1 {
    font-size: 30px;
  }

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