/* ============================================
   김서영 Portfolio - Design System
   PPT 톤 (Navy + Orange) 기반
============================================ */

:root {
  /* Colors - PPT에서 추출 */
  --navy: #1E2761;
  --navy-light: #2D3A7A;
  --navy-dark: #151B47;
  --orange: #E8731A;
  --orange-light: #FF8838;
  --gray-900: #1A1A1A;
  --gray-700: #374151;
  --gray-500: #6B7280;
  --gray-300: #D1D5DB;
  --gray-200: #E5E7EB;
  --gray-100: #F3F4F6;
  --gray-50: #F9FAFB;
  --white: #FFFFFF;

  /* Typography - IBM Plex 계열로 통일 (개발자 + 모던) */
  --font-display: 'IBM Plex Sans KR', 'Pretendard', -apple-system, sans-serif;
  --font-sans: 'IBM Plex Sans KR', 'Pretendard', -apple-system, sans-serif;
  --font-mono: 'IBM Plex Mono', 'JetBrains Mono', 'Consolas', monospace;

  /* Spacing */
  --container: 1200px;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;

  /* Misc */
  --radius: 4px;
  --shadow-sm: 0 1px 3px rgba(30, 39, 97, 0.08);
  --shadow-md: 0 4px 16px rgba(30, 39, 97, 0.1);
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.7;
  letter-spacing: -0.01em;
  color: var(--gray-900);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

/* IBM Plex Sans KR (다양한 굵기) + IBM Plex Mono */
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans+KR:wght@300;400;500;600;700&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

/* ============================================
   Layout
============================================ */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* ============================================
   Header (Navigation)
============================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--gray-200);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: -0.03em;
}

.nav-logo .dot {
  color: var(--orange);
}

.nav-links {
  display: flex;
  gap: var(--space-lg);
  list-style: none;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--gray-700);
  position: relative;
  padding: 0.25rem 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: var(--orange);
  transition: width var(--transition);
}

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

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

/* ============================================
   Hero Section
============================================ */
.hero {
  padding: var(--space-2xl) 0;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--orange);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.hero-eyebrow::before {
  content: '';
  width: 24px;
  height: 1px;
  background: var(--orange);
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3.125rem);
  font-weight: 700;
  line-height: 1.3;
  color: var(--navy);
  letter-spacing: -0.035em;
  margin-bottom: var(--space-md);
}

.hero-title .highlight {
  color: var(--orange);
  font-weight: 700;
}

.hero-subtitle {
  font-size: 1.0625rem;
  font-weight: 400;
  color: var(--gray-700);
  line-height: 1.75;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-lg);
  max-width: 480px;
}

.hero-cta {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: var(--radius);
  transition: all var(--transition);
  cursor: pointer;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--navy);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--navy-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: transparent;
  color: var(--navy);
  border-color: var(--gray-300);
}

.btn-secondary:hover {
  border-color: var(--navy);
  background: var(--gray-50);
}

.btn-arrow {
  transition: transform var(--transition);
}

.btn:hover .btn-arrow {
  transform: translateX(3px);
}

/* Hero Right - Identity Card */
.hero-card {
  background: var(--navy);
  color: var(--white);
  padding: var(--space-xl);
  border-radius: var(--radius);
  position: relative;
  overflow: hidden;
}

.hero-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(232, 115, 26, 0.15) 0%, transparent 60%);
}

.hero-card-content {
  position: relative;
  z-index: 1;
}

.hero-card-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--orange-light);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: var(--space-sm);
}

.hero-card-equation {
  font-family: var(--font-display);
  font-size: 1.375rem;
  font-weight: 500;
  line-height: 1.6;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-lg);
}

.hero-card-equation .plus {
  color: var(--orange);
  font-weight: 700;
  margin: 0 0.5rem;
}

.hero-card-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  padding-top: var(--space-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.15);
}

.stat-number {
  font-family: var(--font-display);
  font-size: 2.125rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--orange-light);
  line-height: 1;
}

.stat-label {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.7);
  margin-top: 0.25rem;
}

/* ============================================
   Section Common
============================================ */
.section {
  padding: var(--space-2xl) 0;
}

.section-alt {
  background: var(--gray-50);
}

.section-header {
  margin-bottom: var(--space-xl);
}

.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--orange);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: var(--space-xs);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 3.5vw, 2.625rem);
  font-weight: 700;
  color: var(--navy);
  letter-spacing: -0.035em;
  line-height: 1.25;
}

/* ============================================
   Strength Section
============================================ */
.strength-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.strength-card {
  background: var(--white);
  padding: var(--space-lg);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  transition: all var(--transition);
}

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

.strength-num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--orange);
  margin-bottom: var(--space-sm);
}

.strength-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: -0.025em;
  margin-bottom: var(--space-sm);
  line-height: 1.4;
}

.strength-desc {
  font-size: 0.9375rem;
  color: var(--gray-700);
  line-height: 1.75;
  letter-spacing: -0.005em;
}

/* ============================================
   Projects Section (Cards)
============================================ */
.project-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.project-card {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--space-lg);
  padding: var(--space-lg);
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  transition: all var(--transition);
  position: relative;
}

.project-card:hover {
  border-color: var(--navy);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.project-card-meta {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.project-tag {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--orange);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.project-period {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--gray-500);
}

.project-role {
  font-size: 0.9rem;
  color: var(--gray-700);
}

.project-title {
  font-family: var(--font-display);
  font-size: 1.625rem;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: -0.03em;
  margin-bottom: 0.5rem;
  line-height: 1.25;
}

.project-tagline {
  font-size: 0.9375rem;
  color: var(--gray-700);
  line-height: 1.65;
  letter-spacing: -0.005em;
  margin-bottom: var(--space-md);
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: var(--space-md);
}

.tech-chip {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.25rem 0.625rem;
  background: var(--gray-100);
  color: var(--gray-700);
  border-radius: 3px;
}

.project-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--navy);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: all var(--transition);
}

.project-link:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

/* ============================================
   Footer
============================================ */
.site-footer {
  background: var(--navy);
  color: var(--white);
  padding: var(--space-xl) 0 var(--space-lg);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.footer-brand {
  font-family: var(--font-display);
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-sm);
}

.footer-brand .dot {
  color: var(--orange);
}

.footer-tagline {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.6;
}

.footer-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--orange-light);
  margin-bottom: var(--space-sm);
}

.footer-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-list a {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.85);
  transition: color var(--transition);
}

.footer-list a:hover {
  color: var(--orange-light);
}

.footer-bottom {
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
  text-align: center;
}

/* ============================================
   Responsive
============================================ */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

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

  .project-card {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .nav-links {
    gap: var(--space-md);
  }
}

@media (max-width: 600px) {
  :root {
    --space-2xl: 4rem;
    --space-xl: 2.5rem;
  }

  .hero-card-stats {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }
}

/* ============================================
   About Page — Intro
============================================ */
.about-intro {
  padding: var(--space-2xl) 0 var(--space-xl);
}

.about-intro-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--space-xl);
  align-items: start;
}

.about-name-block {
  position: sticky;
  top: 100px;
}

.about-name-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--orange);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: var(--space-sm);
}

.about-name {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 4vw, 3.5rem);
  font-weight: 700;
  color: var(--navy);
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin-bottom: var(--space-xs);
}

.about-name-en {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--gray-500);
  margin-bottom: var(--space-md);
}

.about-meta {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding-top: var(--space-md);
  border-top: 1px solid var(--gray-200);
}

.about-meta-row {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: var(--space-sm);
  font-size: 0.875rem;
}

.about-meta-key {
  font-family: var(--font-mono);
  color: var(--gray-500);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding-top: 2px;
}

.about-meta-val {
  color: var(--gray-900);
}

.about-story {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.about-story-lead {
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--navy);
  line-height: 1.55;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

.about-story p {
  font-size: 1rem;
  color: var(--gray-700);
  line-height: 1.8;
  letter-spacing: -0.005em;
}

.about-story p .em {
  color: var(--navy);
  font-weight: 500;
  border-bottom: 2px solid var(--orange);
  padding-bottom: 1px;
}

/* ============================================
   Skills Section
============================================ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.skill-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: var(--space-lg);
  transition: all var(--transition);
}

.skill-card:hover {
  border-color: var(--navy);
  transform: translateY(-2px);
}

.skill-card-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--gray-100);
}

.skill-icon {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  background: var(--navy);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
}

.skill-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--navy);
  letter-spacing: -0.02em;
}

.skill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-chip {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 0.375rem 0.75rem;
  background: var(--gray-100);
  color: var(--gray-700);
  border-radius: 3px;
  transition: all var(--transition);
}

.skill-chip.primary {
  /* 색 구분 제거 — 모든 칩 통일 */
  background: var(--gray-100);
  color: var(--gray-700);
}

.skill-chip:hover {
  transform: translateY(-1px);
}

/* ============================================
   Timeline (Career / Education)
============================================ */
.timeline {
  position: relative;
  padding-left: var(--space-lg);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--gray-200);
}

.timeline-item {
  position: relative;
  padding-bottom: var(--space-lg);
}

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

.timeline-item::before {
  content: '';
  position: absolute;
  left: calc(var(--space-lg) * -1);
  top: 10px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--white);
  border: 2px solid var(--orange);
  transform: translateX(-3px);
}

.timeline-item.current::before {
  background: var(--orange);
}

.timeline-period {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--gray-500);
  margin-bottom: 0.25rem;
  letter-spacing: 0.02em;
}

.timeline-title {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--navy);
  letter-spacing: -0.02em;
  margin-bottom: 0.25rem;
}

.timeline-sub {
  font-size: 0.9rem;
  color: var(--gray-700);
  margin-bottom: 0.5rem;
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
  margin-top: 0.5rem;
}

.timeline-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 0.2rem 0.5rem;
  background: var(--gray-100);
  color: var(--gray-700);
  border-radius: 2px;
  letter-spacing: 0.02em;
}

/* Two-column section for career + education */
.about-two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
}

.about-col-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--orange);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: var(--space-sm);
}

.about-col-heading {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: -0.025em;
  line-height: 1.3;
  margin-bottom: var(--space-lg);
}

/* ============================================
   Certifications Grid
============================================ */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--space-sm);
}

.cert-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.875rem 1rem;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  transition: all var(--transition);
}

.cert-item:hover {
  border-color: var(--orange);
  background: var(--gray-50);
}

.cert-name {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--navy);
  letter-spacing: -0.01em;
}

.cert-year {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--gray-500);
}

.cert-item.dev {
  border-color: var(--orange);
  background: rgba(232, 115, 26, 0.04);
}

.cert-item.dev .cert-name {
  color: var(--orange);
  font-weight: 600;
}

/* ============================================
   About Page Responsive
============================================ */
@media (max-width: 900px) {
  .about-intro-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .about-name-block {
    position: static;
  }

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

  .about-two-col {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
}

/* ============================================
   Project Detail Page
============================================ */
.proj-hero {
  padding: var(--space-2xl) 0 var(--space-xl);
  border-bottom: 1px solid var(--gray-200);
}

.proj-breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--gray-500);
  margin-bottom: var(--space-md);
  letter-spacing: 0.05em;
}

.proj-breadcrumb a {
  color: var(--gray-500);
}

.proj-breadcrumb a:hover {
  color: var(--orange);
}

.proj-breadcrumb .sep {
  margin: 0 0.5rem;
  color: var(--gray-300);
}

.proj-title-row {
  display: flex;
  align-items: baseline;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-bottom: var(--space-md);
}

.proj-title {
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 4vw, 3.25rem);
  font-weight: 700;
  color: var(--navy);
  letter-spacing: -0.04em;
  line-height: 1.1;
}

.proj-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.3rem 0.7rem;
  background: var(--orange);
  color: var(--white);
  border-radius: 3px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.proj-tagline {
  font-size: 1.125rem;
  color: var(--gray-700);
  line-height: 1.6;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-lg);
  max-width: 720px;
}

.proj-meta {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
  padding: var(--space-md) 0;
  border-top: 1px solid var(--gray-200);
  border-bottom: 1px solid var(--gray-200);
}

.proj-meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.proj-meta-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.proj-meta-value {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--navy);
}

.proj-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: var(--space-lg);
}

.proj-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.125rem;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius);
  border: 1px solid var(--gray-300);
  color: var(--navy);
  transition: all var(--transition);
}

.proj-link-btn:hover {
  border-color: var(--navy);
  background: var(--gray-50);
  transform: translateY(-1px);
}

.proj-link-btn.primary {
  background: var(--navy);
  color: var(--white);
  border-color: var(--navy);
}

.proj-link-btn.primary:hover {
  background: var(--navy-dark);
  border-color: var(--navy-dark);
}

.proj-link-icon {
  font-size: 1rem;
}

/* Section heading style for project page */
.proj-section {
  padding: var(--space-xl) 0;
}

.proj-section-alt {
  background: var(--gray-50);
}

.proj-section-header {
  margin-bottom: var(--space-lg);
}

.proj-section-num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--orange);
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}

.proj-section-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  font-weight: 700;
  color: var(--navy);
  letter-spacing: -0.03em;
  line-height: 1.25;
}

.proj-section-desc {
  font-size: 1rem;
  color: var(--gray-700);
  line-height: 1.75;
  letter-spacing: -0.005em;
  margin-top: 0.5rem;
  max-width: 760px;
}

/* Tech Stack table */
.tech-table {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 0;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--white);
}

.tech-row {
  display: contents;
}

.tech-cat,
.tech-vals {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--gray-100);
}

.tech-row:last-child .tech-cat,
.tech-row:last-child .tech-vals {
  border-bottom: none;
}

.tech-cat {
  background: var(--gray-50);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--navy);
  letter-spacing: -0.01em;
  border-right: 1px solid var(--gray-200);
  display: flex;
  align-items: center;
}

.tech-vals {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

/* Feature list - my role */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm);
}

.feature-item {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 1.25rem;
  transition: all var(--transition);
}

.feature-item:hover {
  border-color: var(--orange);
  transform: translateY(-2px);
}

.feature-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--orange);
  letter-spacing: 0.1em;
  margin-bottom: 0.4rem;
}

.feature-name {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--navy);
  letter-spacing: -0.015em;
  margin-bottom: 0.3rem;
}

.feature-desc {
  font-size: 0.85rem;
  color: var(--gray-700);
  line-height: 1.55;
}

/* Architecture diagram (SVG container) */
.arch-diagram {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: var(--space-lg);
  margin-bottom: var(--space-md);
  overflow-x: auto;
}

.arch-diagram svg {
  width: 100%;
  height: auto;
  display: block;
  max-width: 900px;
  margin: 0 auto;
}

.arch-note {
  font-size: 0.875rem;
  color: var(--gray-500);
  line-height: 1.65;
  padding: var(--space-sm) var(--space-md);
  border-left: 2px solid var(--orange);
  background: var(--gray-50);
  margin-top: var(--space-sm);
}

.arch-note strong {
  color: var(--navy);
  font-weight: 600;
}

/* Design points (3 column highlight) */
.design-points {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.design-point {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  transition: all var(--transition);
}

.design-point:hover {
  border-color: var(--navy);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.design-point-num {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--orange);
  letter-spacing: -0.04em;
  line-height: 1;
}

.design-point-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: -0.025em;
  line-height: 1.35;
}

.design-point-desc {
  font-size: 0.9rem;
  color: var(--gray-700);
  line-height: 1.7;
  letter-spacing: -0.005em;
}

/* Spotlight: 회계 도메인 응용 강조 */
.spotlight {
  background: var(--navy);
  color: var(--white);
  padding: var(--space-2xl) 0;
  position: relative;
  overflow: hidden;
}

.spotlight::before {
  content: '';
  position: absolute;
  top: -100px;
  right: -100px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(232, 115, 26, 0.18) 0%, transparent 65%);
  pointer-events: none;
}

.spotlight-inner {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-xl);
  align-items: start;
  position: relative;
  z-index: 1;
}

.spotlight-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--orange-light);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: var(--space-sm);
}

.spotlight-title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.25;
  margin-bottom: var(--space-md);
}

.spotlight-quote {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 400;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.85);
  padding-left: var(--space-md);
  border-left: 2px solid var(--orange);
  margin-top: var(--space-md);
}

.spotlight-body {
  font-size: 0.95rem;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.85);
}

.spotlight-body p {
  margin-bottom: var(--space-md);
}

.spotlight-body p:last-child {
  margin-bottom: 0;
}

.spotlight-body .em {
  color: var(--orange-light);
  font-weight: 500;
}

/* Code block */
.code-block {
  background: #0D1330;
  color: #E2E8F0;
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.825rem;
  line-height: 1.7;
  overflow-x: auto;
  margin-top: var(--space-md);
  white-space: pre;
  tab-size: 2;
}

.code-block .kw {
  color: #FF8838;
}

.code-block .str {
  color: #A5D6A7;
}

.code-block .cm {
  color: #6B7280;
  font-style: italic;
}

.code-block .fn {
  color: #88C0FF;
}

/* Two column code+explanation */
.code-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-top: var(--space-md);
  align-items: start;
}

.code-pair .code-block {
  margin-top: 0;
  margin-bottom: 0;
}

.code-explain {
  font-size: 0.9rem;
  color: var(--gray-700);
  line-height: 1.75;
  padding-top: 0.5rem;
}

.code-explain ul {
  padding-left: 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.code-explain li {
  letter-spacing: -0.005em;
}

.code-explain strong {
  color: var(--navy);
  font-weight: 600;
}

/* Project Page Responsive */
@media (max-width: 900px) {
  .proj-meta {
    grid-template-columns: repeat(2, 1fr);
  }

  .feature-grid,
  .design-points {
    grid-template-columns: 1fr;
  }

  .spotlight-inner {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .code-pair {
    grid-template-columns: 1fr;
  }

  .tech-table {
    grid-template-columns: 120px 1fr;
  }
}

@media (max-width: 600px) {
  .proj-meta {
    grid-template-columns: 1fr 1fr;
  }

  .tech-table {
    grid-template-columns: 1fr;
  }

  .tech-cat {
    border-right: none;
    border-bottom: 1px solid var(--gray-200);
  }
}

/* ============================================
   Contact Page
============================================ */
.contact-hero {
  padding: var(--space-2xl) 0 var(--space-xl);
  text-align: center;
}

.contact-hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--orange);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: var(--space-md);
}

.contact-hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 4.5vw, 3.5rem);
  font-weight: 700;
  color: var(--navy);
  letter-spacing: -0.035em;
  line-height: 1.2;
  margin-bottom: var(--space-md);
}

.contact-hero-title .highlight {
  color: var(--orange);
}

.contact-hero-subtitle {
  font-size: 1.0625rem;
  color: var(--gray-700);
  line-height: 1.7;
  letter-spacing: -0.005em;
  max-width: 560px;
  margin: 0 auto;
}

.contact-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.contact-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: var(--space-lg);
  text-align: center;
  transition: all var(--transition);
}

.contact-card:hover {
  border-color: var(--navy);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.contact-card-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--navy);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  margin-bottom: 0.25rem;
}

.contact-card-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.15em;
}

.contact-card-value {
  font-size: 1rem;
  font-weight: 500;
  color: var(--navy);
  letter-spacing: -0.01em;
}

.contact-card-note {
  font-size: 0.8rem;
  color: var(--gray-500);
  margin-top: 0.2rem;
}

/* Channel grid */
.channels {
  padding: var(--space-xl) 0;
}

.channel-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.channel-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  transition: all var(--transition);
}

.channel-card:hover {
  border-color: var(--orange);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.channel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.channel-name {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: -0.025em;
}

.channel-arrow {
  font-size: 1.1rem;
  color: var(--gray-500);
  transition: all var(--transition);
}

.channel-card:hover .channel-arrow {
  color: var(--orange);
  transform: translate(2px, -2px);
}

.channel-desc {
  font-size: 0.875rem;
  color: var(--gray-700);
  line-height: 1.65;
  flex-grow: 1;
}

.channel-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--gray-500);
  padding-top: var(--space-sm);
  border-top: 1px solid var(--gray-100);
}

/* Closing section */
.contact-closing {
  background: var(--navy);
  color: var(--white);
  padding: var(--space-2xl) 0;
  position: relative;
  overflow: hidden;
  text-align: center;
}

.contact-closing::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  width: 600px;
  height: 600px;
  transform: translateX(-50%);
  background: radial-gradient(circle, rgba(232, 115, 26, 0.12) 0%, transparent 60%);
  pointer-events: none;
}

.contact-closing-inner {
  position: relative;
  z-index: 1;
}

.contact-closing-label {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--orange-light);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: var(--space-md);
}

.contact-closing-title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.3;
  margin-bottom: var(--space-md);
}

.contact-closing-desc {
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.75;
  max-width: 540px;
  margin: 0 auto var(--space-lg);
}

.contact-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.9rem 1.75rem;
  font-size: 1rem;
  font-weight: 500;
  background: var(--orange);
  color: var(--white);
  border-radius: var(--radius);
  transition: all var(--transition);
}

.contact-cta-btn:hover {
  background: var(--orange-light);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(232, 115, 26, 0.4);
}

/* Contact Page Responsive */
@media (max-width: 900px) {
  .contact-cards,
  .channel-grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   Mobile Nav Toggle
============================================ */
.nav-toggle {
  display: none;
  width: 32px;
  height: 32px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  position: relative;
  z-index: 110;
}

.nav-toggle span {
  display: block;
  position: absolute;
  left: 4px;
  width: 24px;
  height: 2px;
  background: var(--navy);
  border-radius: 1px;
  transition: all 0.25s ease;
}

.nav-toggle span:nth-child(1) { top: 9px; }
.nav-toggle span:nth-child(2) { top: 15px; }
.nav-toggle span:nth-child(3) { top: 21px; }

.nav-toggle.open span:nth-child(1) {
  top: 15px;
  transform: rotate(45deg);
}
.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.open span:nth-child(3) {
  top: 15px;
  transform: rotate(-45deg);
}

/* Mobile: hamburger appears, nav becomes overlay */
@media (max-width: 600px) {
  .nav-toggle {
    display: block;
  }

  /* Site header에 stacking context가 생겨도 작동하도록
     nav-links를 site-header 내부의 absolute로 처리 */
  .site-header {
    position: relative;  /* sticky 유지 시 backdrop-filter 충돌 회피 */
  }

  .nav-links {
    display: flex !important;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    padding: 0 1.5rem;
    gap: 0;
    box-shadow: 0 8px 24px rgba(30, 39, 97, 0.1);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease, border 0.3s ease;
    border-bottom: 0 solid var(--gray-200);
  }

  .nav-links.open {
    max-height: 400px;
    padding: 0.5rem 1.5rem 1.5rem;
    border-bottom-width: 1px;
  }

  .nav-links li {
    width: 100%;
    border-bottom: 1px solid var(--gray-100);
  }

  .nav-links li:last-child {
    border-bottom: none;
  }

  .nav-links a {
    display: block;
    padding: 0.875rem 0;
    font-size: 1rem;
    width: 100%;
  }

  .nav-links a::after {
    display: none;
  }
}

/* ============================================
   Reveal Animation
   - JS가 .js-reveal-ready 클래스를 body에 붙인 후에만 숨김 상태 적용
   - JS 비활성 / 검색엔진 / 인쇄 환경에서는 모두 그대로 보임
============================================ */
.js-reveal-ready .reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.js-reveal-ready .reveal.visible {
  opacity: 1;
  transform: translateY(0);
}