/* Paperfolio Style with Warm Beige Background & Theme Variables */
:root {
  --bg-main: #F5F2EB;
  --bg-card: #FFFFFF;
  --bg-pill: #FFFFFF;
  --text-main: #000000;
  --text-sub: #444444;
  --border-main: #000000;
  --accent-purple: #8B5CF6;
  --shadow-main: #000000;
  --tag-bg: #F3F4F6;
  --tag-text: #000000;
}

/* Dark Theme Overrides */
body.dark-theme {
  --bg-main: #0F172A;
  --bg-card: #1E293B;
  --bg-pill: #1E293B;
  --text-main: #F8FAFC;
  --text-sub: #94A3B8;
  --border-main: #FFFFFF;
  --accent-purple: #A855F7;
  --shadow-main: #A855F7;
  --tag-bg: #334155;
  --tag-text: #F8FAFC;
}

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

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.main-content {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Floating Pill Navbar */
.pill-navbar-wrap {
  position: sticky;
  top: 20px;
  z-index: 100;
  margin-bottom: 50px;
  padding: 0 16px;
}

.pill-navbar {
  max-width: 980px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 3px solid var(--border-main);
  border-radius: 9999px;
  box-shadow: 4px 4px 0px var(--shadow-main);
  padding: 6px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.pill-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
}

.logo-ring {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 4px solid var(--border-main);
  display: block;
}

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

.pill-nav-links a {
  text-decoration: none;
  color: var(--text-main);
  font-weight: 700;
  font-size: 13.5px;
  transition: color 0.15s;
}

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

.nav-right-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Action Buttons (Lang, Theme, CmdK) */
.lang-switch-btn,
.theme-toggle-btn,
.cmdk-trigger-btn {
  background: var(--tag-bg);
  border: 2px solid var(--border-main);
  color: var(--text-main);
  padding: 5px 12px;
  border-radius: 20px;
  font-weight: 800;
  font-size: 12px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  box-shadow: 2px 2px 0px var(--shadow-main);
  transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
}

.lang-switch-btn:hover,
.theme-toggle-btn:hover,
.cmdk-trigger-btn:hover {
  background: var(--accent-purple);
  color: #FFFFFF;
  transform: translate(-1px, -1px);
  box-shadow: 3px 3px 0px var(--shadow-main);
}

.pill-mail-btn {
  background: var(--border-main);
  color: var(--bg-card);
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  transition: transform 0.15s;
}

.pill-mail-btn:hover {
  transform: scale(1.08);
}

/* Hero Section Split Layout */
.hero-section {
  padding: 20px 0 60px;
}

.hero-container {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.hero-main-title {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 50px;
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.035em;
  color: var(--text-main);
  margin-bottom: 20px;
}

/* Purple Highlight Block behind Katherine CAO (Yimeng) */
.highlight-purple {
  background: var(--accent-purple);
  color: #FFFFFF;
  padding: 2px 14px;
  border-radius: 8px;
  display: inline-block;
  border: 2px solid var(--border-main);
  box-shadow: 3px 3px 0px var(--shadow-main);
}

.typed-wrap {
  margin-bottom: 20px;
}

.typed-badge {
  display: inline-block;
  background: var(--bg-card);
  border: 2.5px solid var(--border-main);
  border-radius: 20px;
  padding: 6px 16px;
  font-size: 15px;
  font-weight: 800;
  color: var(--accent-purple);
  box-shadow: 3px 3px 0px var(--shadow-main);
}

.hero-desc {
  font-size: 16.5px;
  color: var(--text-sub);
  max-width: 540px;
  margin-bottom: 32px;
  line-height: 1.6;
}

/* Hero Buttons */
.hero-btn-row {
  display: flex;
  gap: 14px;
  align-items: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 12px;
  font-weight: 700;
  font-size: 14px;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn-black {
  background: var(--border-main);
  color: var(--bg-card);
  border: 3px solid var(--border-main);
  box-shadow: 3px 3px 0px var(--shadow-main);
}

.btn-black:hover {
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0px var(--shadow-main);
}

.btn-white {
  background: var(--bg-card);
  color: var(--text-main);
  border: 3px solid var(--border-main);
  box-shadow: 3px 3px 0px var(--shadow-main);
}

.btn-white:hover {
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0px var(--shadow-main);
}

/* Right Side Portrait Card */
.hero-right {
  display: flex;
  justify-content: flex-end;
}

.portrait-card {
  background: #FFC83B;
  border: 3.5px solid var(--border-main);
  border-radius: 32px;
  box-shadow: 8px 8px 0px var(--shadow-main);
  overflow: hidden;
  width: 100%;
  max-width: 400px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.portrait-card:hover {
  transform: translate(-3px, -3px) scale(1.01);
  box-shadow: 12px 12px 0px var(--shadow-main);
}

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

/* Section Common */
.section {
  padding: 50px 0;
}

.section-tag {
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.1em;
  color: var(--accent-purple);
  margin-bottom: 8px;
}

.section-title {
  font-size: 34px;
  font-weight: 900;
  letter-spacing: -0.02em;
  margin-bottom: 28px;
  color: var(--text-main);
}

/* Career Roadmap / Timeline (Staggered Life Journey Style) */
.roadmap-container {
  position: relative;
  max-width: 1000px;
  margin: 40px auto 0;
  padding: 20px 0;
}

.roadmap-container::after {
  content: '';
  position: absolute;
  width: 4px;
  background-color: var(--border-main);
  top: 0;
  bottom: 0;
  left: 50%;
  margin-left: -2px;
  z-index: 1;
}

.roadmap-item {
  padding: 10px 40px;
  position: relative;
  width: 50%;
  z-index: 2;
}

.roadmap-item.left {
  left: 0;
}

.roadmap-item.right {
  left: 50%;
}

.roadmap-dot {
  position: absolute;
  width: 24px;
  height: 24px;
  right: -12px;
  background-color: var(--accent-purple);
  border: 4px solid var(--border-main);
  top: 36px;
  border-radius: 50%;
  z-index: 3;
  box-shadow: 2px 2px 0px var(--shadow-main);
}

.roadmap-item.right .roadmap-dot {
  left: -12px;
}

.roadmap-card {
  background: var(--bg-card);
  border: 3.5px solid var(--border-main);
  border-radius: 20px;
  padding: 24px;
  box-shadow: 5px 5px 0px var(--shadow-main);
  transition: transform 0.25s ease, box-shadow 0.25s ease, opacity 0.3s ease;
}

.roadmap-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: 8px 8px 0px var(--shadow-main);
}

.roadmap-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 12px;
}

/* Transparent, Larger Logo Wrapper */
.company-logo-img-wrapper {
  width: auto;
  height: auto;
  max-width: 130px;
  max-height: 70px;
  background: transparent;
  border: none;
  box-shadow: none;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: flex-start;
}

.company-logo-img {
  max-width: 120px;
  max-height: 65px;
  width: auto;
  height: auto;
  object-fit: contain;
}

.exp-badge {
  background: var(--border-main);
  color: var(--bg-card);
  padding: 4px 12px;
  border-radius: 8px;
  font-size: 11px;
  font-weight: 800;
  white-space: nowrap;
}

.exp-body h3 {
  font-size: 19px;
  font-weight: 900;
  margin-bottom: 4px;
  color: var(--text-main);
}

.exp-body .comp {
  color: var(--accent-purple);
  font-weight: 800;
}

.exp-bullet-list {
  padding-left: 18px;
  margin-top: 10px;
}

.exp-bullet-list li {
  font-size: 14px;
  color: var(--text-sub);
  margin-bottom: 6px;
  line-height: 1.5;
}

/* Skills Grid */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.skill-box {
  background: var(--bg-card);
  border: 3px solid var(--border-main);
  border-radius: 16px;
  padding: 24px;
  box-shadow: 4px 4px 0px var(--shadow-main);
}

.skill-box h3 {
  font-size: 17px;
  font-weight: 900;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-main);
}

.skill-tags-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* UNIFORM UN-HIGHLIGHTED SKILL PILL (Exact user request!) */
.skill-pill {
  background: var(--tag-bg);
  color: var(--tag-text);
  border: 2px solid var(--border-main);
  border-radius: 20px;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 800;
  cursor: pointer;
  transition: transform 0.15s ease, background-color 0.15s ease, color 0.15s ease;
}

.skill-pill:hover,
.skill-pill.active-filter {
  background: var(--accent-purple) !important;
  color: #FFFFFF !important;
  transform: translateY(-2px);
}

/* Certificate Link List & Official Badges */
.cert-link-list {
  list-style: none;
  padding: 0;
  margin-top: 12px;
}

.cert-link-list li {
  margin-bottom: 10px;
}

.cert-link-list a {
  text-decoration: none;
  color: var(--text-main);
  font-weight: 700;
  font-size: 13.5px;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: color 0.15s;
}

.cert-link-list a:hover {
  color: var(--accent-purple);
}

.cert-link-list a i {
  color: var(--accent-purple);
  font-size: 14px;
}

.badge-tag {
  background: #FEF08A;
  border: 1.5.px solid #000000;
  border-radius: 12px;
  padding: 1px 8px;
  font-size: 10.5px;
  font-weight: 800;
  color: #000000;
  margin-left: auto;
}

/* Projects Grid */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.paper-project-card {
  background: var(--bg-card);
  border: 3px solid var(--border-main);
  border-radius: 20px;
  box-shadow: 4px 4px 0px var(--shadow-main);
  overflow: hidden;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease, box-shadow 0.25s ease, opacity 0.3s ease;
  transform-style: preserve-3d;
  perspective: 1000px;
}

.paper-project-card:hover {
  box-shadow: 8px 8px 0px var(--shadow-main);
}

.paper-project-card.dimmed,
.roadmap-card.dimmed {
  opacity: 0.25;
}

.paper-project-card.highlighted,
.roadmap-card.highlighted {
  border-color: var(--accent-purple);
  box-shadow: 0 0 16px var(--accent-purple);
  opacity: 1;
}

.card-img-container {
  height: 160px;
  border-bottom: 3px solid var(--border-main);
  padding: 18px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
}

.ai-bg { background: #DDD6FE; }
.wealth-bg { background: #BAE6FD; }
.fraud-bg { background: #A7F3D0; }

body.dark-theme .ai-bg { background: #4C1D95; }
body.dark-theme .wealth-bg { background: #075985; }
body.dark-theme .fraud-bg { background: #065F46; }

.card-tag {
  background: var(--border-main);
  color: var(--bg-card);
  font-size: 11px;
  font-weight: 800;
  padding: 4px 10px;
  border-radius: 20px;
  align-self: flex-start;
}

.diagram-mini {
  background: var(--bg-card);
  color: var(--text-main);
  border: 2px solid var(--border-main);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 10.5px;
  font-weight: 800;
  box-shadow: 2px 2px 0px var(--shadow-main);
}

.card-info {
  padding: 22px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.card-category {
  font-size: 11px;
  font-weight: 800;
  color: var(--text-sub);
  letter-spacing: 0.05em;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.card-heading {
  font-size: 19px;
  font-weight: 900;
  margin-bottom: 8px;
  color: var(--text-main);
}

.card-text {
  font-size: 13.5px;
  color: var(--text-sub);
  margin-bottom: 16px;
  flex-grow: 1;
  line-height: 1.5;
}

.card-footer-link {
  font-size: 13px;
  font-weight: 800;
  border-top: 2px dashed var(--border-main);
  padding-top: 12px;
  display: flex;
  justify-content: space-between;
  color: var(--text-main);
}

/* Contact Box */
.contact-box {
  background: #FFCA28;
  border: 3.5px solid var(--border-main);
  border-radius: 28px;
  padding: 48px 36px;
  text-align: center;
  box-shadow: 6px 6px 0px var(--shadow-main);
  color: #000000;
}

body.dark-theme .contact-box {
  background: #D97706;
  color: #FFFFFF;
}

.contact-box h2 {
  font-size: 34px;
  font-weight: 900;
  margin-bottom: 12px;
}

.contact-box p {
  font-size: 15px;
  margin-bottom: 24px;
}

.footer {
  text-align: center;
  padding: 36px 0;
  border-top: 3px solid var(--border-main);
  font-size: 13px;
  font-weight: 700;
  color: var(--text-main);
}

/* Modal Windows (Project Details & Command Palette ⌘K) */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(6px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background: var(--bg-card);
  color: var(--text-main);
  border: 4px solid var(--border-main);
  border-radius: 24px;
  box-shadow: 8px 8px 0px var(--shadow-main);
  width: 100%;
  max-width: 620px;
  max-height: 85vh;
  overflow-y: auto;
  padding: 32px;
  position: relative;
  transform: translateY(20px) scale(0.96);
  transition: transform 0.25s ease;
}

.modal-overlay.active .modal-card {
  transform: translateY(0) scale(1);
}

.modal-close-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  background: var(--tag-bg);
  border: 2px solid var(--border-main);
  color: var(--text-main);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  font-weight: 900;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Command Palette (⌘K) Details */
.cmdk-input-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 3px solid var(--border-main);
  padding-bottom: 14px;
  margin-bottom: 20px;
}

.cmdk-input {
  width: 100%;
  background: transparent;
  border: none;
  outline: none;
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
}

.cmdk-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.cmdk-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border: 2px solid var(--border-main);
  border-radius: 12px;
  background: var(--tag-bg);
  cursor: pointer;
  font-weight: 700;
  font-size: 14px;
  transition: background-color 0.15s, transform 0.15s;
}

.cmdk-item:hover {
  background: var(--accent-purple);
  color: #FFFFFF;
  transform: translateX(4px);
}

.cmdk-item i {
  font-size: 16px;
}

/* ── Custom Cursor Dot ── */
.cursor-follower {
  position: fixed;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border-main);
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  will-change: left, top;
  transition: width 0.15s, height 0.15s, background 0.15s;
}

.cursor-follower.magnetic {
  width: 18px;
  height: 18px;
  background: var(--accent-purple);
}

/* ── Particle Canvas ── */
.particle-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 9998;
}

/* ── Card Spotlight Glow ── */
.paper-project-card,
.roadmap-card {
  position: relative;
  overflow: hidden;
}

.paper-project-card::before,
.roadmap-card::before {
  content: '';
  position: absolute;
  top: var(--mouse-y, 50%);
  left: var(--mouse-x, 50%);
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(139,92,246,0.12) 0%, transparent 70%);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
  z-index: 1;
}

.paper-project-card:hover::before,
.roadmap-card:hover::before {
  opacity: 1;
}

/* Ensure card content stays above glow */
.paper-project-card > *,
.roadmap-card > * {
  position: relative;
  z-index: 2;
}

/* ── Dimmed / Highlighted Filter States ── */
.paper-project-card.dimmed,
.roadmap-card.dimmed {
  opacity: 0.3;
  filter: grayscale(0.5);
  transition: opacity 0.3s, filter 0.3s;
}

.paper-project-card.highlighted,
.roadmap-card.highlighted {
  opacity: 1;
  filter: none;
  box-shadow: 6px 6px 0px var(--accent-purple);
  transition: opacity 0.3s, filter 0.3s, box-shadow 0.3s;
}

.skill-pill.active-filter {
  background: var(--accent-purple) !important;
  color: #fff !important;
  box-shadow: 2px 2px 0 var(--shadow-main);
}

/* Responsive Layout */
@media (max-width: 900px) {
  .hero-container { grid-template-columns: 1fr; }
  .hero-right { justify-content: center; margin-top: 24px; }
  .hero-main-title { font-size: 38px; }
  .projects-grid, .skills-grid { grid-template-columns: 1fr; }
  .pill-nav-links { display: none; }

  /* Roadmap Timeline Mobile Stack */
  .roadmap-container::after { left: 24px; }
  .roadmap-item { width: 100%; padding-left: 60px; padding-right: 0; }
  .roadmap-item.right { left: 0; }
  .roadmap-dot, .roadmap-item.right .roadmap-dot { left: 12px; }
  .cursor-follower, .particle-canvas { display: none; }
}