/* ============================================
   David Ornstein — Portfolio Site
   ============================================ */

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

:root {
  --color-bg: #fafaf9;
  --color-bg-alt: #f0efeb;
  --color-text: #1c1917;
  --color-text-muted: #57534e;
  --color-accent: #3b5998;
  --color-accent-light: #e8edf5;
  --color-accent-dark: #2c4270;
  --color-border: #d6d3d1;
  --color-card-bg: #ffffff;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-serif: 'Playfair Display', Georgia, 'Times New Roman', serif;
  --max-width: 1100px;
  --nav-height: 64px;
}

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

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--color-accent-dark);
}

ul {
  list-style: none;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Navigation --- */
#nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(250, 250, 249, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  z-index: 1000;
  transition: border-color 0.3s, box-shadow 0.3s;
}

#nav.scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: 0 1px 8px rgba(0, 0, 0, 0.04);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.nav-logo:hover {
  color: var(--color-accent);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  gap: 5px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: transform 0.3s, opacity 0.3s;
}

.nav-links {
  display: flex;
  gap: 32px;
  align-items: center;
}

.nav-links a {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  transition: color 0.2s;
}

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

/* --- Hero --- */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: calc(var(--nav-height) + 40px) 24px 80px;
  background: linear-gradient(165deg, var(--color-bg) 0%, var(--color-accent-light) 100%);
}

.hero-content {
  max-width: 720px;
  text-align: center;
}

.hero-greeting {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--color-accent);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.hero-name {
  font-family: var(--font-serif);
  font-size: clamp(2.8rem, 6vw, 4.5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
  color: var(--color-text);
}

.hero-tagline {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--color-text-muted);
  line-height: 1.6;
  max-width: 560px;
  margin: 0 auto 40px;
}

.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 14px 32px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: all 0.25s;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-accent-dark);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(59, 89, 152, 0.3);
}

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

.btn-outline:hover {
  background: var(--color-accent);
  color: #fff;
  transform: translateY(-1px);
}

.hero-scroll-hint {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--color-text-muted);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0.6;
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: var(--color-text-muted);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; transform: scaleY(0.6); }
  50% { opacity: 1; transform: scaleY(1); }
}

/* --- Sections --- */
.section {
  padding: 100px 0;
}

.section-alt {
  background: var(--color-bg-alt);
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
  text-align: center;
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 1.1rem;
  margin-bottom: 56px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* --- About --- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 64px;
  align-items: start;
}

.about-text {
  margin-top: 8px;
}

.about-lead {
  font-size: 1.15rem;
  font-weight: 500;
  line-height: 1.7;
  margin-bottom: 20px;
  color: var(--color-text);
}

.about-text p {
  margin-bottom: 16px;
  color: var(--color-text-muted);
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.stat {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 24px 20px;
  text-align: center;
  transition: transform 0.2s, box-shadow 0.2s;
}

.stat[data-term] {
  cursor: pointer;
  position: relative;
}

.stat[data-term]::after {
  content: 'Click to learn more';
  position: absolute;
  bottom: calc(100% + 7px);
  left: 50%;
  transform: translateX(-50%);
  background: #1a202c;
  color: #fff;
  font-size: 0.68rem;
  font-weight: 400;
  padding: 4px 9px;
  border-radius: 4px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s 0.3s;
  z-index: 200;
}

.stat[data-term]:hover::after {
  opacity: 1;
}

.stat:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.stat-number {
  display: block;
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1.2;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: 4px;
}

/* ===================================================================
   Filter Bar — sticky chip-style tag filter for timeline
   =================================================================== */
.filter-bar {
  position: sticky;
  top: 60px;
  z-index: 90;
  margin-bottom: 36px;
  padding: 0;
}

.filter-bar-inner {
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06), 0 1px 4px rgba(0, 0, 0, 0.03);
  transition: box-shadow 0.3s ease;
}

.filter-bar-inner:hover {
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.09), 0 2px 8px rgba(0, 0, 0, 0.04);
}

.filter-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  white-space: nowrap;
  flex-shrink: 0;
}

.filter-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  flex: 1;
}

.filter-chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 13px;
  border: 1.5px solid var(--color-border);
  border-radius: 100px;
  background: transparent;
  color: var(--color-text-muted);
  font-family: var(--font-sans);
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.filter-chip::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: var(--color-accent);
  opacity: 0;
  transform: scale(0.5);
  transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.filter-chip:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(59, 89, 152, 0.12);
}

.filter-chip.active {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: white !important;
  box-shadow: 0 2px 10px rgba(59, 89, 152, 0.25);
}

.filter-chip.active:hover {
  color: white !important;
}

.filter-chip.active::before {
  opacity: 0;
  transform: scale(1);
}

.filter-chip.active:hover {
  color: white;
  box-shadow: 0 4px 14px rgba(59, 89, 152, 0.3);
  transform: translateY(-1px);
}

/* Per-chip tinted backgrounds */
.filter-chip[data-filter="all"]        { background: linear-gradient(135deg, #f0f0f5 0%, #e8e8ef 100%); border-color: #d8d8e2; }
.filter-chip[data-filter="leadership"] { background: linear-gradient(135deg, #fef3e2 0%, #fde8c8 100%); border-color: #f5d5a0; color: #9a6b20; }
.filter-chip[data-filter="architecture"]{ background: linear-gradient(135deg, #e8f0fe 0%, #d4e4fc 100%); border-color: #b8cff0; color: #3b6bb5; }
.filter-chip[data-filter="security"]   { background: linear-gradient(135deg, #e6f4ea 0%, #ceead6 100%); border-color: #a8d5b5; color: #2d6e3f; }
.filter-chip[data-filter="engineering"]{ background: linear-gradient(135deg, #f3e8fd 0%, #e6d5fa 100%); border-color: #ceb8ef; color: #6b3fa0; }
.filter-chip[data-filter="platform"]   { background: linear-gradient(135deg, #e0f2f7 0%, #c8e8f2 100%); border-color: #a0d4e4; color: #1a7a8f; }
.filter-chip[data-filter="startup"]    { background: linear-gradient(135deg, #fff3e0 0%, #ffe8c8 100%); border-color: #ffd49a; color: #b5700a; }
.filter-chip[data-filter="standards"]  { background: linear-gradient(135deg, #e8eef8 0%, #d6dfef 100%); border-color: #b8c6de; color: #3b5280; }
.filter-chip[data-filter="publishing"] { background: linear-gradient(135deg, #fce4ec 0%, #f8d0da 100%); border-color: #e8a8b8; color: #a03050; }
.filter-chip[data-filter="patents"]    { background: linear-gradient(135deg, #fff8e1 0%, #fff0c0 100%); border-color: #f0d870; color: #8a7015; }
.filter-chip[data-filter="compliance"] { background: linear-gradient(135deg, #e0f2f1 0%, #c8e6e4 100%); border-color: #9ecfcc; color: #2a706b; }
.filter-chip[data-filter="m-and-a"]    { background: linear-gradient(135deg, #fbe9e7 0%, #f5d0ca 100%); border-color: #dea898; color: #a04030; }
.filter-chip[data-filter="ai"]         { background: linear-gradient(135deg, #e0f7fa 0%, #c8eef2 100%); border-color: #80cbc4; color: #00695c; }

/* Active state overrides the tint with solid accent */
.filter-chip.active[data-filter="all"]        { background: var(--color-accent); color: white; border-color: var(--color-accent); }
.filter-chip.active[data-filter="leadership"] { background: linear-gradient(135deg, #c07820 0%, #a86510 100%); color: white; border-color: #a86510; box-shadow: 0 2px 10px rgba(168, 101, 16, 0.3); }
.filter-chip.active[data-filter="architecture"]{ background: linear-gradient(135deg, #3b6bb5 0%, #2a5a9e 100%); color: white; border-color: #2a5a9e; box-shadow: 0 2px 10px rgba(42, 90, 158, 0.3); }
.filter-chip.active[data-filter="security"]   { background: linear-gradient(135deg, #2d8e4f 0%, #1e7a3e 100%); color: white; border-color: #1e7a3e; box-shadow: 0 2px 10px rgba(30, 122, 62, 0.3); }
.filter-chip.active[data-filter="engineering"]{ background: linear-gradient(135deg, #7b4fb8 0%, #6535a0 100%); color: white; border-color: #6535a0; box-shadow: 0 2px 10px rgba(101, 53, 160, 0.3); }
.filter-chip.active[data-filter="platform"]   { background: linear-gradient(135deg, #1a8a9f 0%, #147080 100%); color: white; border-color: #147080; box-shadow: 0 2px 10px rgba(20, 112, 128, 0.3); }
.filter-chip.active[data-filter="startup"]    { background: linear-gradient(135deg, #c57a0a 0%, #a86500 100%); color: white; border-color: #a86500; box-shadow: 0 2px 10px rgba(168, 101, 0, 0.3); }
.filter-chip.active[data-filter="standards"]  { background: linear-gradient(135deg, #3b5290 0%, #2a4278 100%); color: white; border-color: #2a4278; box-shadow: 0 2px 10px rgba(42, 66, 120, 0.3); }
.filter-chip.active[data-filter="publishing"] { background: linear-gradient(135deg, #b83860 0%, #a02850 100%); color: white; border-color: #a02850; box-shadow: 0 2px 10px rgba(160, 40, 80, 0.3); }
.filter-chip.active[data-filter="patents"]    { background: linear-gradient(135deg, #9a8015 0%, #806a10 100%); color: white; border-color: #806a10; box-shadow: 0 2px 10px rgba(128, 106, 16, 0.3); }
.filter-chip.active[data-filter="compliance"] { background: linear-gradient(135deg, #2a807b 0%, #1e6b66 100%); color: white; border-color: #1e6b66; box-shadow: 0 2px 10px rgba(30, 107, 102, 0.3); }
.filter-chip.active[data-filter="m-and-a"]    { background: linear-gradient(135deg, #b04838 0%, #983828 100%); color: white; border-color: #983828; box-shadow: 0 2px 10px rgba(152, 56, 40, 0.3); }
.filter-chip.active[data-filter="ai"]         { background: linear-gradient(135deg, #00897b 0%, #00695c 100%); color: white; border-color: #00695c; box-shadow: 0 2px 10px rgba(0, 105, 92, 0.3); }

/* Hover for tinted chips keeps their color family */
.filter-chip[data-filter="leadership"]:hover  { border-color: #c07820; }
.filter-chip[data-filter="architecture"]:hover { border-color: #3b6bb5; }
.filter-chip[data-filter="security"]:hover    { border-color: #2d8e4f; }
.filter-chip[data-filter="engineering"]:hover { border-color: #7b4fb8; }
.filter-chip[data-filter="platform"]:hover    { border-color: #1a8a9f; }
.filter-chip[data-filter="startup"]:hover     { border-color: #c57a0a; }
.filter-chip[data-filter="standards"]:hover   { border-color: #3b5290; }
.filter-chip[data-filter="publishing"]:hover  { border-color: #b83860; }
.filter-chip[data-filter="patents"]:hover     { border-color: #9a8015; }
.filter-chip[data-filter="compliance"]:hover  { border-color: #2a807b; }
.filter-chip[data-filter="m-and-a"]:hover     { border-color: #b04838; }
.filter-chip[data-filter="ai"]:hover          { border-color: #00897b; }

.filter-chip-icon {
  width: 14px;
  height: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}

.filter-chip-icon svg {
  width: 14px;
  height: 14px;
  stroke: currentColor;
}

.filter-chip > :not(.filter-chip-icon) {
  position: relative;
  z-index: 1;
}

/* Ripple click effect */
@keyframes filterChipRipple {
  0% { transform: scale(0); opacity: 0.4; }
  100% { transform: scale(2.5); opacity: 0; }
}

.filter-chip .ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
  width: 40px;
  height: 40px;
  pointer-events: none;
  animation: filterChipRipple 0.5s ease-out forwards;
}

/* Counter badge */
.filter-count {
  display: flex;
  align-items: center;
  gap: 5px;
  margin-left: auto;
  flex-shrink: 0;
}

.filter-count-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 26px;
  height: 26px;
  border-radius: 8px;
  background: var(--color-accent);
  color: white;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0 6px;
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1),
              background 0.3s ease;
}

.filter-count-num.bounce {
  transform: scale(1.25);
}

.filter-count-label {
  font-size: 0.68rem;
  color: var(--color-text-muted);
  font-weight: 500;
  letter-spacing: 0.02em;
}

/* ===================================================================
   Filter summary blurb
   =================================================================== */
.filter-summary {
  max-width: 860px;
  margin: 0 auto 32px;
  padding: 0 0 0 44px;
  overflow: hidden;
  transition: max-height 0.45s cubic-bezier(0.4, 0, 0.2, 1),
              opacity 0.35s ease,
              margin-bottom 0.35s ease;
  max-height: 0;
  opacity: 0;
}

.filter-summary.visible {
  max-height: 200px;
  opacity: 1;
  margin-bottom: 32px;
}

.filter-summary-inner {
  background: linear-gradient(135deg, rgba(255,255,255,0.92) 0%, rgba(248,250,252,0.95) 100%);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent);
  border-radius: 10px;
  padding: 18px 22px;
  font-size: 0.92rem;
  line-height: 1.65;
  color: var(--color-text);
  backdrop-filter: blur(8px);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
  animation: summarySlideIn 0.4s cubic-bezier(0.34, 1.3, 0.64, 1) forwards;
}

@keyframes summarySlideIn {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.filter-summary-inner strong {
  color: var(--color-accent-dark);
}

/* Category-colored left borders */
.filter-summary[data-active-filter="leadership"] .filter-summary-inner  { border-left-color: #c07820; }
.filter-summary[data-active-filter="architecture"] .filter-summary-inner { border-left-color: #3b6bb5; }
.filter-summary[data-active-filter="security"] .filter-summary-inner    { border-left-color: #2d8e4f; }
.filter-summary[data-active-filter="engineering"] .filter-summary-inner { border-left-color: #7b4fb8; }
.filter-summary[data-active-filter="platform"] .filter-summary-inner    { border-left-color: #1a8a9f; }
.filter-summary[data-active-filter="startup"] .filter-summary-inner     { border-left-color: #c57a0a; }
.filter-summary[data-active-filter="standards"] .filter-summary-inner   { border-left-color: #3b5290; }
.filter-summary[data-active-filter="publishing"] .filter-summary-inner  { border-left-color: #b83860; }
.filter-summary[data-active-filter="patents"] .filter-summary-inner     { border-left-color: #9a8015; }
.filter-summary[data-active-filter="compliance"] .filter-summary-inner  { border-left-color: #2a807b; }
.filter-summary[data-active-filter="m-and-a"] .filter-summary-inner     { border-left-color: #b04838; }

.filter-summary[data-active-filter="leadership"] .filter-summary-inner strong  { color: #c07820; }
.filter-summary[data-active-filter="architecture"] .filter-summary-inner strong { color: #3b6bb5; }
.filter-summary[data-active-filter="security"] .filter-summary-inner strong    { color: #2d8e4f; }
.filter-summary[data-active-filter="engineering"] .filter-summary-inner strong { color: #7b4fb8; }
.filter-summary[data-active-filter="platform"] .filter-summary-inner strong    { color: #1a8a9f; }
.filter-summary[data-active-filter="startup"] .filter-summary-inner strong     { color: #c57a0a; }
.filter-summary[data-active-filter="standards"] .filter-summary-inner strong   { color: #3b5290; }
.filter-summary[data-active-filter="publishing"] .filter-summary-inner strong  { color: #b83860; }
.filter-summary[data-active-filter="patents"] .filter-summary-inner strong     { color: #9a8015; }
.filter-summary[data-active-filter="compliance"] .filter-summary-inner strong  { color: #2a807b; }
.filter-summary[data-active-filter="m-and-a"] .filter-summary-inner strong     { color: #b04838; }

/* ===================================================================
   Timeline era filtering transitions
   =================================================================== */
.timeline-era.filtered-out {
  opacity: 0;
  transform: translateY(-8px) scale(0.97);
  max-height: 0 !important;
  margin-bottom: 0;
  padding-top: 0;
  padding-bottom: 0;
  pointer-events: none;
  filter: blur(2px);
  overflow: hidden;
  border-color: transparent;
}

.timeline-era.filtered-in {
  animation: eraAppear 0.55s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

@keyframes eraAppear {
  0% {
    opacity: 0;
    transform: translateY(16px) scale(0.96);
    filter: blur(4px);
  }
  60% {
    opacity: 1;
    filter: blur(0);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
    filter: blur(0);
  }
}

/* Staggered entry for multiple items */
.timeline-era.filtered-in:nth-child(1) { animation-delay: 0ms; }
.timeline-era.filtered-in:nth-child(2) { animation-delay: 40ms; }
.timeline-era.filtered-in:nth-child(3) { animation-delay: 80ms; }
.timeline-era.filtered-in:nth-child(4) { animation-delay: 120ms; }
.timeline-era.filtered-in:nth-child(5) { animation-delay: 160ms; }
.timeline-era.filtered-in:nth-child(6) { animation-delay: 200ms; }
.timeline-era.filtered-in:nth-child(7) { animation-delay: 240ms; }
.timeline-era.filtered-in:nth-child(8) { animation-delay: 280ms; }
.timeline-era.filtered-in:nth-child(9) { animation-delay: 320ms; }
.timeline-era.filtered-in:nth-child(10) { animation-delay: 360ms; }
.timeline-era.filtered-in:nth-child(11) { animation-delay: 400ms; }
.timeline-era.filtered-in:nth-child(12) { animation-delay: 440ms; }
.timeline-era.filtered-in:nth-child(13) { animation-delay: 480ms; }

/* No-results message */
.filter-empty-msg {
  text-align: center;
  padding: 60px 20px;
  color: var(--color-text-muted);
  font-size: 1rem;
  font-weight: 500;
  opacity: 0;
  animation: fadeIn 0.4s 0.2s forwards;
}

@keyframes fadeIn {
  to { opacity: 1; }
}

.filter-empty-msg .filter-empty-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
  display: block;
  opacity: 0.4;
}

/* --- Timeline (two-level: era containers with project cards) --- */
.timeline {
  position: relative;
  padding-left: 44px;
  max-width: 860px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--color-border);
}

/* --- Era container (employer / organization) --- */
.timeline-era {
  position: relative;
  margin-bottom: 48px;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.5s cubic-bezier(0.4, 0, 0.2, 1),
              max-height 0.5s cubic-bezier(0.4, 0, 0.2, 1),
              margin-bottom 0.4s cubic-bezier(0.4, 0, 0.2, 1),
              filter 0.3s ease;
  max-height: 4000px;
  overflow: visible;
}

.timeline-era.visible {
  opacity: 1;
  transform: translateY(0);
}

.timeline-era-marker {
  position: absolute;
  left: -44px;
  top: 4px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 3px solid var(--color-accent);
  z-index: 1;
  transition: box-shadow 0.2s;
  box-shadow: 0 0 0 4px var(--color-bg-alt);
}

.timeline-era:hover .timeline-era-marker {
  box-shadow: 0 0 0 4px var(--color-bg-alt), 0 0 0 7px rgba(59, 89, 152, 0.15);
}

.timeline-era-header {
  display: flex;
  align-items: baseline;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.timeline-era-header h3 {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-text);
}

.timeline-era-dates {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.timeline-era-summary {
  color: var(--color-text-muted);
  font-size: 0.92rem;
  line-height: 1.65;
  margin-bottom: 18px;
  max-width: 720px;
}

/* --- Project / activity cards within an era --- */
.timeline-cards {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.timeline-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 22px 26px;
  transition: box-shadow 0.2s, transform 0.2s;
  position: relative;
}

.timeline-card:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
  transform: translateX(3px);
}

.timeline-card-header {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 4px;
}

.timeline-card h4 {
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-text);
}

.timeline-card-dates {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.timeline-card-role {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  font-weight: 500;
  margin-bottom: 8px;
}

.timeline-card p:last-child {
  color: var(--color-text-muted);
  font-size: 0.88rem;
  line-height: 1.6;
  margin: 0;
}

.timeline-card-outcome {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid rgba(0, 0, 0, 0.05);
  font-size: 0.84rem !important;
  color: var(--color-accent-dark) !important;
  font-weight: 500;
}

.timeline-img {
  display: block;
  width: 100%;
  max-height: 180px;
  object-fit: contain;
  border-radius: 8px;
  margin-bottom: 12px;
  background: var(--color-bg-alt);
}

.timeline-img-small {
  max-height: 70px;
  width: auto;
  max-width: 180px;
}

/* ===================================================================
   Value Proposition ("What I Bring") Section
   =================================================================== */
.value-section {
  background: linear-gradient(170deg, var(--color-bg) 0%, #eef2f9 50%, var(--color-accent-light) 100%);
}

.value-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}

.value-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 14px;
  padding: 32px 26px;
  transition: transform 0.3s cubic-bezier(0.34, 1.3, 0.64, 1),
              box-shadow 0.3s ease,
              border-color 0.3s ease;
  position: relative;
  overflow: hidden;
}

.value-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-dark));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.value-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(59, 89, 152, 0.12);
  border-color: var(--color-accent);
}

.value-card:hover::before {
  opacity: 1;
}

.value-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--color-accent-light) 0%, #dce4f5 100%);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.value-icon svg {
  width: 24px;
  height: 24px;
  color: var(--color-accent);
}

.value-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
  color: var(--color-text);
}

.value-card p {
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--color-text-muted);
}

.value-card p em {
  font-style: italic;
  color: var(--color-text);
}

.value-cta {
  text-align: center;
  max-width: 680px;
  margin: 0 auto;
  padding: 40px;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.04);
}

.value-cta-text {
  font-size: 1.08rem;
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: 24px;
  font-weight: 500;
}

.value-cta-text em {
  font-style: italic;
  color: var(--color-accent);
}

/* ===================================================================
   Testimonials / Endorsements Section
   =================================================================== */
.testimonials-section {
  background: linear-gradient(175deg, #1c2333 0%, #2a3550 40%, #3b5998 100%);
  color: #fff;
  position: relative;
  overflow: hidden;
}

.testimonials-section::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,0.03) 0%, transparent 70%);
  pointer-events: none;
}

.testimonials-section .section-title {
  color: #fff;
}

.testimonials-section .section-subtitle {
  color: rgba(255, 255, 255, 0.6);
}

/* --- Carousel Layout --- */
.testimonial-carousel {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  padding: 0 60px;
}

.carousel-viewport {
  overflow: hidden;
  border-radius: 16px;
}

.carousel-track {
  display: flex;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: transform;
}

.testimonial-slide {
  flex: 0 0 100%;
  min-width: 100%;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 16px;
  padding: 48px 40px 36px;
  position: relative;
  backdrop-filter: blur(8px);
  box-sizing: border-box;
  margin: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 280px;
}

.testimonial-quote-mark {
  font-family: var(--font-serif);
  font-size: 5rem;
  line-height: 1;
  color: rgba(255, 255, 255, 0.12);
  position: absolute;
  top: 12px;
  left: 32px;
  pointer-events: none;
}

.testimonial-text {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.92);
  margin-bottom: 24px;
  position: relative;
  z-index: 1;
  font-style: italic;
}

.testimonial-footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.testimonial-author {
  font-size: 0.95rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.9);
  letter-spacing: 0.01em;
}

.testimonial-role {
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.45);
}

/* --- Carousel Navigation Buttons --- */
.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.7);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  z-index: 2;
  padding: 0;
}

.carousel-btn:hover {
  background: rgba(255, 255, 255, 0.18);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.4);
}

.carousel-btn svg {
  width: 20px;
  height: 20px;
}

.carousel-prev { left: 0; }
.carousel-next { right: 0; }

/* --- Carousel Dots --- */
.carousel-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 28px;
  flex-wrap: wrap;
}

.carousel-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, 0.2);
  cursor: pointer;
  padding: 0;
  transition: background 0.3s ease, transform 0.3s ease;
}

.carousel-dot:hover {
  background: rgba(255, 255, 255, 0.4);
}

.carousel-dot.active {
  background: rgba(255, 255, 255, 0.85);
  transform: scale(1.2);
}

/* --- Counter --- */
.carousel-counter {
  text-align: center;
  margin-top: 12px;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.35);
  letter-spacing: 0.05em;
}

/* ===================================================================
   Contact Section — engagement-focused
   =================================================================== */
.contact-section {
  background: var(--color-bg);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

.contact-frame {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 36px 32px;
}

.contact-frame h3 {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--color-text);
}

.contact-modes {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-modes li {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  text-align: left;
}

.contact-modes li svg {
  width: 22px;
  height: 22px;
  color: var(--color-accent);
  flex-shrink: 0;
  margin-top: 2px;
}

.contact-modes li strong {
  display: block;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 2px;
}

.contact-modes li span {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.contact-action {
  position: relative;
}

.contact-action-inner {
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);
  border-radius: 16px;
  padding: 40px 36px;
  color: #fff;
  text-align: center;
  box-shadow: 0 8px 32px rgba(59, 89, 152, 0.25);
}

.contact-action-inner h3 {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: #fff;
}

.contact-action-inner > p {
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 28px;
  line-height: 1.6;
}

.contact-buttons {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.contact-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #fff;
  color: var(--color-accent-dark);
  border: none;
  padding: 14px 28px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.25s;
}

.contact-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
  color: var(--color-accent-dark);
}

.contact-btn svg {
  width: 18px;
  height: 18px;
}

.contact-resume {
  display: flex;
  align-items: center;
  gap: 8px;
  justify-content: center;
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.6);
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding-top: 16px;
}

.contact-resume svg {
  width: 16px;
  height: 16px;
  opacity: 0.6;
}

/* --- Scroll-reveal animation --- */
.reveal-on-scroll {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal-on-scroll.revealed {
  opacity: 1;
  transform: translateY(0);
}

.value-card.reveal-on-scroll:nth-child(2) { transition-delay: 0.08s; }
.value-card.reveal-on-scroll:nth-child(3) { transition-delay: 0.16s; }
.value-card.reveal-on-scroll:nth-child(4) { transition-delay: 0.24s; }
.value-card.reveal-on-scroll:nth-child(5) { transition-delay: 0.32s; }
.value-card.reveal-on-scroll:nth-child(6) { transition-delay: 0.40s; }

/* --- Skills --- */
.skills-columns {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 36px;
}

.skill-group h3 {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-accent);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

.skill-list li {
  padding: 8px 0;
  font-size: 0.92rem;
  color: var(--color-text-muted);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.skill-list li:last-child {
  border-bottom: none;
}

/* --- Patents --- */
.patents-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  max-width: 900px;
  margin: 40px auto 0;
}

.patent-block {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 32px;
}

.patent-block h3 {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.patent-block p,
.patent-block li {
  color: var(--color-text-muted);
  font-size: 0.92rem;
  line-height: 1.65;
}

.patent-block ul {
  margin-top: 8px;
}

.patent-block li {
  padding: 10px 0;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.patent-block li:last-child {
  border-bottom: none;
}

.patent-block strong {
  color: var(--color-text);
}

/* --- Interests --- */
.interests-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 28px;
  max-width: 900px;
  margin: 0 auto;
}

.interest-item {
  text-align: center;
  padding: 24px 16px;
  border-radius: 12px;
  transition: background 0.2s;
}

.interest-item:hover {
  background: rgba(255, 255, 255, 0.6);
}

.interest-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  margin-bottom: 12px;
}

.interest-icon svg {
  width: 28px;
  height: 28px;
  color: var(--color-accent);
}

.interest-item h3 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.interest-item p {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.interest-img {
  width: 80px;
  height: 80px;
  object-fit: cover;
  border-radius: 50%;
  margin-bottom: 8px;
}

.interests-note {
  text-align: center;
  margin-top: 48px;
  color: var(--color-text-muted);
  font-style: italic;
  font-size: 0.95rem;
}

/* --- Contact --- */
#contact {
  text-align: center;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 32px;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-text);
  transition: all 0.25s;
}

.contact-link:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(59, 89, 152, 0.12);
}

.contact-link svg {
  width: 20px;
  height: 20px;
}

/* --- Footer --- */
footer {
  padding: 32px 0;
  text-align: center;
  border-top: 1px solid var(--color-border);
}

footer p {
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

/* --- Glossary terms (inline) --- */
.term {
  background: #e8f0fe;
  border-bottom: 1.5px solid var(--color-accent);
  color: var(--color-accent-dark);
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
  padding: 1px 4px;
  margin: 0 -1px;
  border-radius: 3px;
  position: relative;
  font-weight: 500;
}

.term::after {
  content: 'Click to learn more';
  position: absolute;
  bottom: calc(100% + 7px);
  left: 50%;
  transform: translateX(-50%);
  background: #1a202c;
  color: #fff;
  font-size: 0.68rem;
  font-weight: 400;
  font-style: normal;
  letter-spacing: 0.01em;
  padding: 4px 9px;
  border-radius: 4px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s 0.3s;
  z-index: 200;
}

.term:hover {
  background: #d2e3fc;
  color: var(--color-accent-dark);
  border-bottom-color: var(--color-accent);
}

.term:hover::after {
  opacity: 1;
}

/* --- Glossary overlay --- */
.glossary-overlay {
  position: fixed;
  inset: 0;
  background: rgba(28, 25, 23, 0.3);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 2000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease;
}

.glossary-overlay.active {
  opacity: 1;
  pointer-events: all;
}

/* --- Glossary flyout panel --- */
.glossary-panel {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 440px;
  max-width: 92vw;
  background: var(--color-card-bg);
  z-index: 2001;
  transform: translateX(100%);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: -8px 0 40px rgba(0, 0, 0, 0.12);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.glossary-panel.active {
  transform: translateX(0);
}

.glossary-close {
  position: sticky;
  top: 0;
  align-self: flex-end;
  background: none;
  border: none;
  font-size: 2rem;
  line-height: 1;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 20px 24px 0;
  transition: color 0.15s;
  z-index: 1;
}

.glossary-close:hover {
  color: var(--color-text);
}

.glossary-body {
  padding: 8px 36px 48px;
  flex: 1;
}

.glossary-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  background: var(--color-accent-light);
  padding: 4px 10px;
  border-radius: 4px;
  margin-bottom: 16px;
}

.glossary-title {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
  line-height: 1.3;
}

.glossary-image {
  margin-bottom: 20px;
  border-radius: 8px;
  overflow: hidden;
  background: var(--color-bg-alt);
}

.glossary-image img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 240px;
  object-fit: contain;
  border-radius: 8px;
}

.glossary-text p {
  color: var(--color-text-muted);
  font-size: 0.94rem;
  line-height: 1.7;
  margin-bottom: 14px;
}

.glossary-text code {
  font-size: 0.88em;
  background: var(--color-bg-alt);
  padding: 2px 6px;
  border-radius: 4px;
}

.glossary-links {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
}

.glossary-links-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: 12px;
}

.glossary-links a {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 0;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-accent);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  transition: color 0.15s, padding-left 0.2s;
}

.glossary-links a:last-child {
  border-bottom: none;
}

.glossary-links a:hover {
  color: var(--color-accent-dark);
  padding-left: 4px;
}

.glossary-links a svg {
  flex-shrink: 0;
  opacity: 0.5;
}

/* --- Patent Detail Page --- */
.page-hero {
  padding: calc(var(--nav-height) + 60px) 0 60px;
  background: linear-gradient(165deg, var(--color-bg) 0%, var(--color-accent-light) 100%);
}

.back-link {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-accent);
  margin-bottom: 24px;
  transition: color 0.2s, transform 0.2s;
}

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

.page-hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  color: var(--color-text);
}

.page-hero-subtitle {
  font-size: clamp(1rem, 1.8vw, 1.15rem);
  color: var(--color-text-muted);
  line-height: 1.65;
  max-width: 680px;
}

.patent-story {
  max-width: 760px;
}

.patent-story p {
  margin-bottom: 20px;
  line-height: 1.8;
  color: var(--color-text);
}

.patent-story code {
  font-size: 0.88em;
  background: var(--color-bg-alt);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--color-accent-dark);
}

.patent-story ul {
  list-style: none;
  padding: 0;
}

.legacy-heading {
  font-family: var(--font-sans);
  font-size: 1.15rem;
  font-weight: 600;
  margin: 32px 0 12px;
  color: var(--color-text);
}

.legacy-list {
  margin: 0 0 20px 0;
  padding: 0;
}

.legacy-list li {
  position: relative;
  padding: 6px 0 6px 20px;
  line-height: 1.7;
}

.legacy-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 14px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
  opacity: 0.4;
}

.legacy-summary {
  margin-top: 48px;
  padding: 32px;
  background: var(--color-accent-light);
  border-radius: 12px;
  border-left: 4px solid var(--color-accent);
}

.legacy-summary p {
  line-height: 1.8;
  margin-bottom: 12px;
}

.legacy-summary p:last-child {
  margin-bottom: 0;
  font-style: italic;
  color: var(--color-text-muted);
}

.patent-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.patent-entry {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid var(--color-border);
}

.patent-entry:first-child {
  padding-top: 0;
}

.patent-entry:last-child {
  border-bottom: none;
}

.patent-number-col a {
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: 0.01em;
}

.patent-number-col a:hover {
  color: var(--color-accent-dark);
}

.patent-detail-col h3 {
  font-family: var(--font-sans);
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 6px;
  color: var(--color-text);
}

.patent-meta {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-bottom: 10px;
}

.patent-detail-col p {
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--color-text-muted);
}

@media (max-width: 640px) {
  .patent-entry {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}

/* --- Responsive --- */
@media (max-width: 900px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-stats {
    grid-template-columns: repeat(4, 1fr);
  }

  .value-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .testimonial-carousel {
    padding: 0 50px;
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .skills-columns {
    grid-template-columns: repeat(2, 1fr);
  }

  .interests-grid {
    grid-template-columns: repeat(3, 1fr);
  }

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

@media (max-width: 640px) {
  .section {
    padding: 64px 0;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    flex-direction: column;
    gap: 0;
    padding: 16px 0;
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s, opacity 0.3s;
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .nav-links li {
    width: 100%;
  }

  .nav-links a {
    display: block;
    padding: 12px 24px;
    font-size: 1rem;
  }

  .about-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .value-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .value-cta {
    padding: 28px 20px;
  }

  .testimonial-carousel {
    padding: 0 16px;
  }

  .carousel-btn {
    width: 36px;
    height: 36px;
    position: static;
    transform: none;
  }

  .testimonial-carousel {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
  }

  .carousel-viewport {
    order: 0;
    width: 100%;
  }

  .carousel-prev { order: -1; }
  .carousel-next { order: 1; }
  .carousel-dots { order: 2; width: 100%; }
  .carousel-counter { order: 3; width: 100%; }

  .testimonial-slide {
    padding: 36px 24px 28px;
    min-height: 220px;
  }

  .testimonial-text {
    font-size: 1.05rem;
  }

  .testimonial-quote-mark {
    font-size: 3.5rem;
    left: 20px;
  }

  .contact-action-inner {
    padding: 28px 20px;
  }

  .contact-frame {
    padding: 28px 22px;
  }

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

  .interests-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .timeline {
    padding-left: 36px;
  }

  .timeline-era-marker {
    left: -36px;
    width: 18px;
    height: 18px;
  }

  .timeline-card {
    padding: 18px 20px;
  }

  .hero-scroll-hint {
    display: none;
  }

  .filter-bar {
    top: 52px;
  }

  .filter-bar-inner {
    padding: 10px 14px;
    gap: 8px;
    border-radius: 12px;
  }

  .filter-label {
    display: none;
  }

  .filter-chips {
    gap: 5px;
  }

  .filter-chip {
    padding: 5px 10px;
    font-size: 0.68rem;
  }

  .filter-chip-icon {
    width: 12px;
    height: 12px;
  }

  .filter-chip-icon svg {
    width: 12px;
    height: 12px;
  }

  .filter-count {
    display: none;
  }
}