/* ============================================================
   UAV Seminar Proposal — Responsive Stylesheet
   Design: Clean academic / tech aesthetic
   ============================================================ */

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

:root {
  --blue-900: #0d1b2a;
  --blue-800: #1b2d45;
  --blue-700: #1e3a5f;
  --blue-600: #2563a8;
  --blue-500: #3b82f6;
  --blue-400: #60a5fa;
  --blue-300: #93c5fd;
  --blue-100: #dbeafe;

  --sky:       #38bdf8;
  --teal:      #2dd4bf;
  --amber:     #f59e0b;
  --red:       #ef4444;
  --green:     #22c55e;
  --orange:    #fb923c;

  --gray-950:  #0a0f1a;
  --gray-900:  #111827;
  --gray-800:  #1f2937;
  --gray-700:  #374151;
  --gray-600:  #4b5563;
  --gray-400:  #9ca3af;
  --gray-300:  #d1d5db;
  --gray-200:  #e5e7eb;
  --gray-100:  #f3f4f6;
  --gray-50:   #f9fafb;
  --white:     #ffffff;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: 'Merriweather', Georgia, serif;

  --radius-sm: 6px;
  --radius:    12px;
  --radius-lg: 20px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
  --shadow:    0 4px 16px rgba(0,0,0,0.12);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.18);

  --transition: 0.2s ease;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--gray-50);
  color: var(--gray-900);
  line-height: 1.7;
  font-size: 16px;
}

a { color: var(--blue-600); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--blue-500); text-decoration: underline; }

/* ── Top Navigation ── */
.topnav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(13, 27, 42, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  transition: background var(--transition);
}

.topnav.scrolled {
  background: rgba(13, 27, 42, 0.98);
  box-shadow: var(--shadow);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 60px;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-logo {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--blue-300);
  letter-spacing: 0.03em;
  white-space: nowrap;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 0.25rem;
  margin-left: auto;
}

.nav-links a {
  color: var(--gray-300);
  font-size: 0.82rem;
  font-weight: 500;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
  letter-spacing: 0.01em;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--white);
  background: rgba(255,255,255,0.08);
  text-decoration: none;
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  margin-left: auto;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--gray-300);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

/* ── Hero ── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--blue-900);
  padding-top: 60px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 60% 40%, rgba(37,99,168,0.35) 0%, transparent 70%),
    radial-gradient(ellipse 50% 40% at 10% 80%, rgba(45,212,191,0.1) 0%, transparent 60%),
    linear-gradient(160deg, var(--blue-900) 0%, #0a1628 100%);
}

/* Animated grid overlay */
.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(59,130,246,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59,130,246,0.06) 1px, transparent 1px);
  background-size: 60px 60px;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 700px;
  padding: 4rem 2rem;
  text-align: center;
}

.badge {
  display: inline-block;
  background: rgba(59,130,246,0.2);
  border: 1px solid rgba(59,130,246,0.4);
  color: var(--blue-300);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.35rem 1rem;
  border-radius: 100px;
  margin-bottom: 1.5rem;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.2rem, 6vw, 3.8rem);
  font-weight: 700;
  color: var(--white);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 0.6rem;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 3vw, 1.5rem);
  color: var(--blue-300);
  font-weight: 400;
  margin-bottom: 2.5rem;
  letter-spacing: 0.01em;
}

.hero-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2.5rem;
  padding: 1.5rem 2rem;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
}

.meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.meta-label {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--blue-400);
}

.meta-value {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--white);
}

.meta-divider {
  width: 1px;
  height: 36px;
  background: rgba(255,255,255,0.12);
}

.hero-cta {
  display: inline-block;
  background: var(--blue-600);
  color: var(--white);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.75rem 2rem;
  border-radius: 100px;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.hero-cta:hover {
  background: var(--blue-500);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(59,130,246,0.4);
  text-decoration: none;
  color: var(--white);
}

.drone-visual {
  position: absolute;
  right: 5%;
  top: 50%;
  transform: translateY(-50%);
  width: clamp(160px, 20vw, 260px);
  opacity: 0.55;
  animation: float 6s ease-in-out infinite;
}

.drone-svg { width: 100%; height: auto; }

@keyframes float {
  0%, 100% { transform: translateY(-50%) translateX(0); }
  50% { transform: translateY(calc(-50% - 12px)) translateX(6px); }
}

/* ── Stats Strip ── */
.stats-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  background: var(--blue-800);
}

.stat-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
  border-right: 1px solid rgba(255,255,255,0.07);
  text-align: center;
  transition: background var(--transition);
}

.stat-card:last-child { border-right: none; }
.stat-card:hover { background: rgba(255,255,255,0.04); }

.stat-number {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  color: var(--sky);
  line-height: 1;
  margin-bottom: 0.4rem;
}

.stat-label {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--gray-400);
  letter-spacing: 0.02em;
}

/* ── Sections ── */
.section { padding: 5rem 1.5rem; }
.section-alt { background: var(--white); }

.section-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.section-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--blue-600);
  margin-bottom: 0.6rem;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 700;
  color: var(--gray-900);
  line-height: 1.2;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

.section-intro {
  color: var(--gray-600);
  font-size: 1.05rem;
  margin-bottom: 2.5rem;
  max-width: 720px;
  line-height: 1.8;
}

/* ── Abstract Card ── */
.abstract-card {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-left: 4px solid var(--blue-500);
  border-radius: var(--radius);
  padding: 2rem 2.5rem;
  margin-bottom: 2.5rem;
}

.abstract-card p {
  color: var(--gray-700);
  font-size: 1.05rem;
  line-height: 1.85;
  margin-bottom: 1rem;
}

.abstract-card p:last-child { margin-bottom: 0; }

/* ── Challenge Pills ── */
.challenge-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.challenge-pill {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 100px;
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--gray-700);
  transition: border-color var(--transition), box-shadow var(--transition);
  box-shadow: var(--shadow-sm);
}

.challenge-pill:hover {
  border-color: var(--blue-400);
  box-shadow: 0 2px 8px rgba(59,130,246,0.15);
}

.pill-icon { font-size: 1rem; }

/* ── Two-column layout ── */
.two-col {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 3rem;
  align-items: start;
}

.col-text p {
  color: var(--gray-700);
  line-height: 1.85;
  margin-bottom: 1.25rem;
  font-size: 1rem;
}

.col-text p:last-child { margin-bottom: 0; }

.info-box {
  background: var(--gray-900);
  border-radius: var(--radius);
  padding: 1.75rem;
  box-shadow: var(--shadow-lg);
}

.info-box h4 {
  color: var(--white);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.challenge-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.challenge-list li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--gray-300);
  font-size: 0.88rem;
  line-height: 1.5;
}

.tag {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  flex-shrink: 0;
}

.tag-red    { background: rgba(239,68,68,0.25);  color: #fca5a5; }
.tag-orange { background: rgba(251,146,60,0.25); color: #fdba74; }
.tag-yellow { background: rgba(245,158,11,0.2);  color: #fcd34d; }

/* ── Dataset Grid ── */
.dataset-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1.25rem;
}

.dataset-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

.dataset-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--blue-500), var(--sky));
  opacity: 0;
  transition: opacity var(--transition);
}

.dataset-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
  border-color: var(--blue-300);
}

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

.dataset-card.featured {
  border-color: var(--blue-400);
  box-shadow: 0 0 0 1px var(--blue-400), var(--shadow);
}

.dataset-card.featured::before { opacity: 1; }

.dataset-header {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.dataset-name {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--gray-900);
  letter-spacing: -0.01em;
}

.ds-badge {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  background: var(--blue-100);
  color: var(--blue-600);
  align-self: flex-start;
}

.ds-badge.popular {
  background: rgba(245,158,11,0.15);
  color: #92400e;
}

.dataset-body p {
  font-size: 0.88rem;
  color: var(--gray-600);
  line-height: 1.6;
  margin-bottom: 0.75rem;
}

.ds-stats {
  display: flex;
  gap: 1rem;
}

.ds-stat {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.ds-stat strong {
  font-size: 1rem;
  font-weight: 700;
  color: var(--blue-600);
  display: block;
}

.ds-stat span {
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--gray-400);
}

.dataset-cite {
  font-size: 0.78rem;
  color: var(--gray-400);
  border-top: 1px solid var(--gray-100);
  padding-top: 0.75rem;
  margin-top: auto;
}

/* ── Arch Tabs (Model sections) ── */
.arch-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.arch-section { display: flex; flex-direction: column; gap: 1rem; }

.arch-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.transformer-header {
  background: rgba(139,92,246,0.1);
  border: 1px solid rgba(139,92,246,0.25);
  color: #7c3aed;
}

.cnn-header {
  background: rgba(59,130,246,0.1);
  border: 1px solid rgba(59,130,246,0.25);
  color: var(--blue-600);
}

.arch-icon { font-size: 1.2rem; }

.model-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.model-card {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.model-card:hover {
  border-color: var(--blue-300);
  box-shadow: 0 2px 12px rgba(59,130,246,0.1);
}

.model-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
  gap: 0.5rem;
}

.model-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--gray-900);
}

.model-tag {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  background: var(--gray-200);
  color: var(--gray-600);
  white-space: nowrap;
}

.model-card p {
  font-size: 0.84rem;
  color: var(--gray-600);
  line-height: 1.6;
  margin-bottom: 0.5rem;
}

.model-cite {
  font-size: 0.75rem;
  color: var(--gray-400);
}

/* ── Callout ── */
.callout {
  display: flex;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  line-height: 1.6;
  align-items: flex-start;
}

.callout-warning {
  background: rgba(245,158,11,0.08);
  border: 1px solid rgba(245,158,11,0.3);
  color: var(--gray-700);
}

.callout-icon { font-size: 1.2rem; flex-shrink: 0; margin-top: 1px; }

/* ── Solutions Grid ── */
.solutions-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.solution-card {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: start;
  gap: 1rem;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition);
}

.solution-card:hover { box-shadow: var(--shadow); }

.sol-label {
  display: block;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.problem-label  { color: var(--red); }
.solution-label { color: var(--green); }

.sol-problem p, .sol-solution p {
  font-size: 0.88rem;
  color: var(--gray-700);
  line-height: 1.6;
}

.sol-arrow {
  font-size: 1.2rem;
  color: var(--gray-400);
  padding-top: 1.8rem;
  align-self: start;
}

/* ── Conclusion ── */
.conclusion-card {
  background: linear-gradient(135deg, var(--blue-900), #0a1628);
  border-radius: var(--radius-lg);
  padding: 3rem;
  color: var(--white);
  box-shadow: var(--shadow-lg);
}

.conclusion-card p {
  font-size: 1.05rem;
  line-height: 1.85;
  color: rgba(255,255,255,0.85);
  margin-bottom: 1.25rem;
}

.conclusion-card strong { color: var(--white); }

.conclusion-points {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(255,255,255,0.1);
}

.cp-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.9rem;
  color: rgba(255,255,255,0.8);
  line-height: 1.5;
}

.cp-check {
  color: var(--teal);
  font-weight: 700;
  font-size: 1rem;
  flex-shrink: 0;
  margin-top: 1px;
}

/* ── References ── */
.ref-group {
  margin-bottom: 3rem;
}

.ref-group-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--gray-800);
  margin-bottom: 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--gray-200);
  letter-spacing: -0.01em;
}

.ref-list {
  list-style: decimal;
  padding-left: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.ref-list li {
  font-size: 0.88rem;
  color: var(--gray-700);
  line-height: 1.7;
  padding-left: 0.5rem;
}

.ref-list em { color: var(--gray-500); }

.ref-group.extended .ref-list-extended li {
  color: var(--gray-600);
}

.cite {
  color: var(--blue-600);
  font-size: 0.8em;
  font-weight: 600;
  padding: 0 0.2em;
  transition: color var(--transition);
}

.cite:hover { color: var(--blue-400); }

/* ── Footer ── */
.footer {
  background: var(--gray-900);
  padding: 2rem 1.5rem;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.footer-left {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.footer-left strong {
  color: var(--white);
  font-size: 0.9rem;
}

.footer-left span, .footer-right span {
  font-size: 0.78rem;
  color: var(--gray-400);
}

/* ── Scroll Progress Bar ── */
#progress-bar {
  position: fixed;
  top: 60px;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--blue-500), var(--sky));
  width: 0%;
  z-index: 101;
  transition: width 0.1s linear;
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .two-col {
    grid-template-columns: 1fr;
  }

  .col-visual { order: -1; }

  .info-box { max-width: 480px; }

  .arch-tabs {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .hamburger { display: flex; }

  .nav-links {
    position: fixed;
    top: 60px;
    left: 0; right: 0;
    background: var(--blue-900);
    border-bottom: 1px solid rgba(255,255,255,0.08);
    flex-direction: column;
    padding: 1rem 1.5rem;
    gap: 0.25rem;
    display: none;
  }

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

  .nav-links a {
    padding: 0.7rem 1rem;
    font-size: 0.9rem;
  }

  .hero-content { padding: 3rem 1.5rem 2rem; }

  .drone-visual { display: none; }

  .meta-divider { display: none; }

  .hero-meta {
    flex-direction: column;
    text-align: center;
    padding: 1.25rem;
  }

  .stats-strip {
    grid-template-columns: 1fr 1fr;
  }

  .stat-card:nth-child(2) { border-right: none; }
  .stat-card:nth-child(3),
  .stat-card:nth-child(4) {
    border-top: 1px solid rgba(255,255,255,0.07);
  }

  .section { padding: 3.5rem 1.25rem; }

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

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

  .solution-card {
    grid-template-columns: 1fr;
  }

  .sol-arrow { display: none; }

  .conclusion-points {
    grid-template-columns: 1fr;
  }

  .conclusion-card { padding: 2rem 1.5rem; }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .stats-strip { grid-template-columns: 1fr; }

  .stat-card { border-right: none; border-bottom: 1px solid rgba(255,255,255,0.07); }
  .stat-card:last-child { border-bottom: none; }

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

  .hero-title { font-size: 2rem; }
}

/* ── PACI Dataset additions ── */
.ds-split {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.5rem;
  margin-bottom: 0.5rem;
}

.split-tag {
  font-size: 0.65rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  letter-spacing: 0.04em;
}

.split-tag.train { background: rgba(34,197,94,0.15); color: #15803d; }
.split-tag.val   { background: rgba(245,158,11,0.15); color: #92400e; }
.split-tag.test  { background: rgba(239,68,68,0.15);  color: #b91c1c; }

.ds-classes {
  font-size: 0.78rem;
  color: var(--gray-500);
  margin-top: 0.4rem;
  margin-bottom: 0 !important;
}

/* ── Results Section ── */
.results-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.result-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--transition), transform var(--transition);
}

.result-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
}

.result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  gap: 0.75rem;
}

.gdino-header { background: linear-gradient(90deg, rgba(139,92,246,0.15), rgba(139,92,246,0.05)); border-bottom: 2px solid rgba(139,92,246,0.4); }
.yolo-header  { background: linear-gradient(90deg, rgba(59,130,246,0.15), rgba(59,130,246,0.05));  border-bottom: 2px solid rgba(59,130,246,0.4); }
.detr-header  { background: linear-gradient(90deg, rgba(251,146,60,0.15), rgba(251,146,60,0.05));  border-bottom: 2px solid rgba(251,146,60,0.4); }
.d2-header    { background: linear-gradient(90deg, rgba(239,68,68,0.12), rgba(239,68,68,0.04));    border-bottom: 2px solid rgba(239,68,68,0.35); }

.result-model-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--gray-900);
}

.result-arch-badge {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  background: var(--gray-200);
  color: var(--gray-600);
  white-space: nowrap;
}

.result-body {
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  flex: 1;
}

.result-config {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.config-item {
  font-size: 0.78rem;
  color: var(--gray-500);
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
}

.config-item code {
  font-family: 'Courier New', monospace;
  font-size: 0.78rem;
  color: var(--blue-600);
}

.result-verdict {
  font-size: 0.9rem;
  line-height: 1.6;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  border-left: 3px solid;
}

.verdict-positive { background: rgba(34,197,94,0.08);  border-color: var(--green); color: var(--gray-700); }
.verdict-neutral  { background: rgba(245,158,11,0.08); border-color: var(--amber); color: var(--gray-700); }
.verdict-mixed    { background: rgba(239,68,68,0.07);  border-color: var(--red);   color: var(--gray-700); }

.result-highlights {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.highlight-item {
  display: flex;
  gap: 0.6rem;
  font-size: 0.82rem;
  color: var(--gray-600);
  line-height: 1.5;
}

.hi-label {
  font-weight: 700;
  color: var(--gray-800);
  white-space: nowrap;
  flex-shrink: 0;
}

.hi-label::after { content: ':'; }

/* Detectron2 metrics bars */
.result-metrics {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.metric-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.8rem;
}

.metric-name {
  width: 140px;
  flex-shrink: 0;
  color: var(--gray-600);
  font-size: 0.78rem;
}

.metric-bar-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--gray-100);
  border-radius: 100px;
  overflow: hidden;
  height: 18px;
  position: relative;
}

.metric-bar {
  height: 100%;
  background: var(--blue-500);
  border-radius: 100px;
  min-width: 4px;
  transition: width 0.6s ease;
}

.metric-bar-highlight { background: linear-gradient(90deg, var(--blue-500), var(--teal)); }

.metric-val {
  position: absolute;
  right: 8px;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--gray-700);
}

/* ── Preliminary Comparison ── */
.comp-table-wrap {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-sm);
  margin-bottom: 2rem;
}

.comp-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  background: var(--white);
}

.comp-table thead {
  background: var(--gray-900);
}

.comp-table thead th {
  padding: 0.85rem 1.1rem;
  text-align: left;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gray-300);
  white-space: nowrap;
}

.comp-table tbody tr {
  border-bottom: 1px solid var(--gray-100);
  transition: background var(--transition);
}

.comp-table tbody tr:last-child { border-bottom: none; }

.comp-table tbody tr:hover { background: var(--gray-50); }

.comp-table tbody td {
  padding: 1rem 1.1rem;
  color: var(--gray-700);
  vertical-align: top;
  line-height: 1.55;
}

.comp-model { min-width: 140px; }

.arch-pill {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  white-space: nowrap;
}

.arch-pill.transformer { background: rgba(139,92,246,0.12); color: #7c3aed; }
.arch-pill.cnn         { background: rgba(59,130,246,0.12);  color: var(--blue-600); }
.arch-pill.mixed       { background: rgba(251,146,60,0.12);  color: #c2410c; }

.verdict-pill {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.25rem 0.65rem;
  border-radius: 100px;
  white-space: nowrap;
}

.verdict-pill.positive { background: rgba(34,197,94,0.15);  color: #15803d; }
.verdict-pill.neutral  { background: rgba(245,158,11,0.15); color: #92400e; }
.verdict-pill.mixed    { background: rgba(239,68,68,0.12);  color: #b91c1c; }

.comp-insights {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.insight-card {
  display: flex;
  gap: 1rem;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 1.25rem;
  align-items: flex-start;
}

.insight-icon { font-size: 1.5rem; flex-shrink: 0; }

.insight-body strong {
  display: block;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 0.4rem;
}

.insight-body p {
  font-size: 0.82rem;
  color: var(--gray-600);
  line-height: 1.6;
  margin: 0;
}

/* ── Future Direction ── */
.future-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.future-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition);
}

.future-card:hover { box-shadow: var(--shadow); }

.future-primary {
  border-color: var(--blue-300);
  background: linear-gradient(135deg, var(--white), rgba(219,234,254,0.3));
}

.future-side {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.future-icon { font-size: 1.6rem; margin-bottom: 0.75rem; }

.future-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 0.75rem;
  letter-spacing: -0.01em;
}

.future-card p {
  font-size: 0.88rem;
  color: var(--gray-600);
  line-height: 1.7;
  margin-bottom: 0.75rem;
}

.future-card p:last-child { margin-bottom: 0; }

.future-note {
  font-style: italic;
  color: var(--gray-500) !important;
  font-size: 0.8rem !important;
}

/* Incremental diagram */
.incremental-diagram {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  padding: 1rem;
  margin: 0.75rem 0;
}

.inc-step {
  background: var(--white);
  border: 1px solid var(--blue-300);
  border-radius: var(--radius-sm);
  padding: 0.4rem 0.7rem;
  text-align: center;
  min-width: 64px;
}

.inc-highlight {
  background: var(--blue-100);
  border-color: var(--blue-500);
}

.inc-label {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--blue-700);
  line-height: 1.3;
  letter-spacing: 0.02em;
}

.inc-arrow {
  color: var(--blue-400);
  font-size: 1.1rem;
  font-weight: 700;
  flex-shrink: 0;
}

/* Limitations */
.limitations-block {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 2rem;
}

.limitations-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.limitation-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.lim-icon { font-size: 1.25rem; flex-shrink: 0; margin-top: 2px; }

.limitation-item strong {
  display: block;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 0.4rem;
}

.limitation-item p {
  font-size: 0.84rem;
  color: var(--gray-600);
  line-height: 1.6;
  margin: 0;
}

/* ── Responsive additions ── */
@media (max-width: 1024px) {
  .results-grid    { grid-template-columns: 1fr; }
  .comp-insights   { grid-template-columns: 1fr; }
  .future-grid     { grid-template-columns: 1fr; }
  .limitations-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .comp-table { font-size: 0.8rem; }
  .comp-table tbody td,
  .comp-table thead th { padding: 0.7rem 0.8rem; }
}

/* ── Print Styles ── */
@media print {
  .topnav, #progress-bar, .hero-cta, .hamburger { display: none !important; }
  .hero { min-height: auto; padding: 2rem; }
  .section { padding: 2rem 1rem; }
  body { font-size: 13px; }
}