/* ============================================================
   DP Academic — Main Stylesheet
   Academic minimal portfolio · Bootstrap 5 custom layer
   ============================================================ */

/* ─── 1. Design Tokens ─────────────────────────────────────── */
:root {
  --dp-navy:          #1B2A4A;
  --dp-navy-light:    #2C3E6B;
  --dp-navy-subtle:   #EEF1F7;
  --dp-olive:         #6B7553;
  --dp-olive-light:   #8A9970;
  --dp-beige:         #F5F0E8;
  --dp-beige-dark:    #E6E0D4;
  --dp-gray-50:       #FAFAFA;
  --dp-gray-100:      #F4F4F2;
  --dp-gray-200:      #E8E8E5;
  --dp-gray-300:      #D4D4D0;
  --dp-text:          #1A1A1A;
  --dp-text-2:        #4A5168;
  --dp-text-muted:    #8A93A2;
  --dp-border:        #E5E5E2;
  --dp-white:         #FFFFFF;

  --font-heading: 'Manrope', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body:    'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-alt:     'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;

  --radius-sm:  4px;
  --radius-md:  8px;
  --radius-lg:  16px;

  --shadow-sm:  0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md:  0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg:  0 8px 32px rgba(0,0,0,0.10);

  --transition: 0.25s ease;
  --section-py: 6rem;
}

/* ─── 2. Base & Reset ──────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.7;
  color: var(--dp-text);
  background: var(--dp-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--dp-text);
  margin-bottom: 1rem;
}

h1 { font-size: clamp(2.4rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.5rem); }
h3 { font-size: clamp(1.3rem, 2.5vw, 1.6rem); }
h4 { font-size: 1.2rem; }
h5 { font-size: 1.05rem; }
h6 { font-size: 0.95rem; }

p { margin-bottom: 1.25rem; }
p:last-child { margin-bottom: 0; }

a {
  color: var(--dp-navy);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--dp-olive); }

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

/* ─── 3. Utilities ─────────────────────────────────────────── */
.dp-label {
  font-family: var(--font-alt);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--dp-olive);
}

.dp-divider {
  width: 40px;
  height: 2px;
  background: var(--dp-olive);
  display: inline-block;
  margin-bottom: 1.5rem;
}

.section-py { padding-top: var(--section-py); padding-bottom: var(--section-py); }

.bg-dp-gray   { background-color: var(--dp-gray-100); }
.bg-dp-beige  { background-color: var(--dp-beige); }
.bg-dp-navy   { background-color: var(--dp-navy); }

.text-dp-navy   { color: var(--dp-navy); }
.text-dp-olive  { color: var(--dp-olive); }
.text-dp-muted  { color: var(--dp-text-muted); }

.dp-tag {
  display: inline-block;
  padding: 0.2rem 0.7rem;
  border: 1px solid var(--dp-border);
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--dp-text-2);
  background: var(--dp-white);
  transition: all var(--transition);
}
.dp-tag:hover {
  border-color: var(--dp-navy);
  color: var(--dp-navy);
}

/* Reveal animation */
.dp-reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.dp-reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ─── 4. Buttons ───────────────────────────────────────────── */
.btn {
  font-family: var(--font-body);
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  letter-spacing: 0.01em;
}

.btn-dp-primary {
  background: var(--dp-navy);
  color: var(--dp-white);
  border: 1.5px solid var(--dp-navy);
  padding: 0.65rem 1.6rem;
}
.btn-dp-primary:hover {
  background: var(--dp-navy-light);
  border-color: var(--dp-navy-light);
  color: var(--dp-white);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-dp-outline {
  background: transparent;
  color: var(--dp-navy);
  border: 1.5px solid var(--dp-navy);
  padding: 0.65rem 1.6rem;
}
.btn-dp-outline:hover {
  background: var(--dp-navy);
  color: var(--dp-white);
  transform: translateY(-1px);
}

.btn-dp-ghost {
  background: transparent;
  color: var(--dp-text-2);
  border: 1.5px solid var(--dp-border);
  padding: 0.6rem 1.4rem;
}
.btn-dp-ghost:hover {
  border-color: var(--dp-navy);
  color: var(--dp-navy);
}

.btn-dp-link {
  background: none;
  border: none;
  padding: 0;
  color: var(--dp-navy);
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  letter-spacing: 0.01em;
}
.btn-dp-link::after {
  content: '→';
  transition: transform var(--transition);
}
.btn-dp-link:hover::after { transform: translateX(4px); }
.btn-dp-link:hover { color: var(--dp-olive); }

/* ─── 5. Navbar ────────────────────────────────────────────── */
#dp-navbar {
  font-family: var(--font-body);
  padding: 1.2rem 0;
  transition: all 0.35s ease;
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 999;
  background: transparent;
}

/* Admin bar offset — desktop 32px, mobile 46px */
.admin-bar #dp-navbar { top: 32px; }
@media screen and (max-width: 782px) {
  .admin-bar #dp-navbar { top: 46px; }
}
@media screen and (max-width: 600px) {
  .admin-bar #dp-navbar { top: 0; }
}

#dp-navbar.scrolled {
  padding: 0.8rem 0;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--dp-border);
  box-shadow: 0 1px 16px rgba(0,0,0,0.05);
}

#dp-navbar.nav-solid {
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--dp-border);
}

.navbar-brand {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--dp-navy) !important;
  letter-spacing: -0.02em;
}
.navbar-brand span {
  color: var(--dp-olive);
}

.navbar-nav .nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--dp-text-2) !important;
  padding: 0.4rem 0.9rem !important;
  letter-spacing: 0.01em;
  transition: color var(--transition);
  position: relative;
}
.navbar-nav .nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0.9rem;
  right: 0.9rem;
  height: 2px;
  background: var(--dp-olive);
  transform: scaleX(0);
  transition: transform var(--transition);
}
.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active { color: var(--dp-navy) !important; }
.navbar-nav .nav-link:hover::after,
.navbar-nav .nav-link.active::after { transform: scaleX(1); }

.navbar-toggler {
  border: 1.5px solid var(--dp-border);
  border-radius: var(--radius-sm);
  padding: 0.4rem 0.6rem;
}
.navbar-toggler:focus { box-shadow: none; }

/* ─── 6. Hero ──────────────────────────────────────────────── */
.dp-hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 7rem 0 5rem;
  background: linear-gradient(160deg, #FAFAFA 60%, var(--dp-beige) 100%);
  position: relative;
  overflow: hidden;
}

.dp-hero::before {
  content: '';
  position: absolute;
  top: -80px;
  right: -80px;
  width: 560px;
  height: 560px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(107,117,83,0.07) 0%, transparent 70%);
  pointer-events: none;
}

.dp-hero-label {
  font-family: var(--font-alt);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--dp-olive);
  margin-bottom: 1.2rem;
}

.dp-hero-name {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(2.8rem, 6vw, 4.2rem);
  line-height: 1.1;
  color: var(--dp-navy);
  letter-spacing: -0.03em;
  margin-bottom: 1.4rem;
}

.dp-hero-bio {
  font-size: 1.1rem;
  line-height: 1.75;
  color: var(--dp-text-2);
  max-width: 480px;
  margin-bottom: 2.2rem;
}

.dp-hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.dp-hero-meta {
  margin-top: 2.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.dp-hero-meta-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--dp-text-muted);
  font-family: var(--font-alt);
}

.dp-hero-image-wrap {
  position: relative;
  display: flex;
  justify-content: center;
}

.dp-hero-image-frame {
  position: relative;
  display: inline-block;
}

.dp-hero-image-frame::before {
  content: '';
  position: absolute;
  inset: -12px -12px 12px 12px;
  border: 2px solid var(--dp-beige-dark);
  border-radius: var(--radius-lg);
  z-index: 0;
}

.dp-hero-portrait {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 420px;
  border-radius: var(--radius-lg);
  object-fit: cover;
  aspect-ratio: 4/5;
  box-shadow: var(--shadow-lg);
}

.dp-hero-badge {
  position: absolute;
  bottom: 2rem;
  left: -1.5rem;
  background: var(--dp-white);
  border: 1px solid var(--dp-border);
  border-radius: var(--radius-md);
  padding: 0.8rem 1.1rem;
  box-shadow: var(--shadow-md);
  z-index: 2;
}

.dp-hero-badge-label {
  font-size: 0.7rem;
  color: var(--dp-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
  margin-bottom: 0.15rem;
}
.dp-hero-badge-value {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--dp-navy);
}

/* ─── 7. Section Header ────────────────────────────────────── */
.dp-section-head {
  margin-bottom: 3.5rem;
}

.dp-section-label {
  font-family: var(--font-alt);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--dp-olive);
  margin-bottom: 0.75rem;
}

.dp-section-title {
  font-family: var(--font-heading);
  font-weight: 800;
  color: var(--dp-navy);
  letter-spacing: -0.025em;
  margin-bottom: 0.75rem;
}

.dp-section-sub {
  font-size: 1rem;
  color: var(--dp-text-2);
  max-width: 560px;
  line-height: 1.7;
}

/* ─── 8. Research Cards ────────────────────────────────────── */
.dp-research-card {
  background: var(--dp-white);
  border: 1px solid var(--dp-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition);
  height: 100%;
  display: flex;
  flex-direction: column;
}

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

.dp-research-card-img {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/9;
}

.dp-research-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.dp-research-card:hover .dp-research-card-img img {
  transform: scale(1.04);
}

.dp-research-card-img-placeholder {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--dp-navy-subtle), var(--dp-beige));
  display: flex;
  align-items: center;
  justify-content: center;
}

.dp-research-card-body {
  padding: 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.dp-research-card-year {
  font-size: 0.75rem;
  color: var(--dp-text-muted);
  font-family: var(--font-alt);
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.dp-research-card-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--dp-navy);
  line-height: 1.35;
  margin-bottom: 0.75rem;
}
.dp-research-card-title a {
  color: inherit;
}
.dp-research-card-title a:hover { color: var(--dp-olive); }

.dp-research-card-abstract {
  font-size: 0.9rem;
  color: var(--dp-text-2);
  line-height: 1.65;
  flex: 1;
  margin-bottom: 1.25rem;
}

.dp-research-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.25rem;
}

.dp-research-card-footer {
  border-top: 1px solid var(--dp-border);
  padding-top: 1rem;
  margin-top: auto;
}

/* ─── 9. Blog Cards ────────────────────────────────────────── */
.dp-blog-card {
  background: var(--dp-white);
  border: 1px solid var(--dp-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition);
  height: 100%;
  display: flex;
  flex-direction: column;
}
.dp-blog-card:hover {
  border-color: var(--dp-gray-300);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.dp-blog-card-img {
  overflow: hidden;
  aspect-ratio: 3/2;
}
.dp-blog-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.dp-blog-card:hover .dp-blog-card-img img { transform: scale(1.04); }

.dp-blog-card-body {
  padding: 1.4rem 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.dp-blog-card-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.78rem;
  color: var(--dp-text-muted);
  font-family: var(--font-alt);
  margin-bottom: 0.75rem;
}

.dp-blog-card-cat {
  display: inline-block;
  padding: 0.15rem 0.6rem;
  background: var(--dp-navy-subtle);
  color: var(--dp-navy);
  border-radius: 100px;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.dp-blog-card-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.05rem;
  line-height: 1.4;
  color: var(--dp-text);
  margin-bottom: 0.65rem;
}
.dp-blog-card-title a { color: inherit; }
.dp-blog-card-title a:hover { color: var(--dp-navy); }

.dp-blog-card-excerpt {
  font-size: 0.88rem;
  color: var(--dp-text-2);
  line-height: 1.65;
  flex: 1;
  margin-bottom: 1.25rem;
}

.dp-blog-card-footer {
  border-top: 1px solid var(--dp-border);
  padding-top: 0.9rem;
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Blog list featured style */
.dp-blog-featured {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--dp-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--dp-white);
  transition: all var(--transition);
}
.dp-blog-featured:hover { box-shadow: var(--shadow-md); }
@media (max-width: 768px) {
  .dp-blog-featured { grid-template-columns: 1fr; }
}

.dp-blog-featured-img {
  overflow: hidden;
  min-height: 320px;
}
.dp-blog-featured-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.dp-blog-featured:hover .dp-blog-featured-img img { transform: scale(1.04); }

.dp-blog-featured-body {
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

/* ─── 10. Activity Cards ───────────────────────────────────── */
.dp-activity-card {
  background: var(--dp-white);
  border: 1px solid var(--dp-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition);
}
.dp-activity-card:hover {
  border-color: var(--dp-navy);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.dp-activity-card-img {
  overflow: hidden;
  aspect-ratio: 4/3;
}
.dp-activity-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.dp-activity-card:hover .dp-activity-card-img img { transform: scale(1.04); }

.dp-activity-card-body { padding: 1.5rem; }

.dp-activity-card-role {
  display: inline-block;
  padding: 0.2rem 0.7rem;
  background: var(--dp-beige);
  color: var(--dp-olive);
  border-radius: 100px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.dp-activity-card-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--dp-navy);
  margin-bottom: 0.5rem;
}

.dp-activity-card-org {
  font-size: 0.85rem;
  color: var(--dp-text-muted);
  margin-bottom: 0.75rem;
}

.dp-activity-card-desc {
  font-size: 0.88rem;
  color: var(--dp-text-2);
  line-height: 1.65;
  margin-bottom: 1rem;
}

.dp-activity-impact {
  display: flex;
  gap: 1.2rem;
  flex-wrap: wrap;
  padding-top: 1rem;
  border-top: 1px solid var(--dp-border);
}

.dp-activity-impact-item {
  text-align: center;
}
.dp-activity-impact-number {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--dp-navy);
  line-height: 1;
}
.dp-activity-impact-label {
  font-size: 0.72rem;
  color: var(--dp-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: 0.15rem;
}

/* ─── 11. Timeline ─────────────────────────────────────────── */
.dp-timeline {
  position: relative;
  padding-left: 2rem;
}
.dp-timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 0;
  width: 1px;
  background: var(--dp-border);
}

.dp-timeline-item {
  position: relative;
  padding-bottom: 2.5rem;
}
.dp-timeline-item:last-child { padding-bottom: 0; }

.dp-timeline-dot {
  position: absolute;
  left: -2.4rem;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--dp-white);
  border: 2px solid var(--dp-olive);
  transition: background var(--transition);
}
.dp-timeline-item:hover .dp-timeline-dot { background: var(--dp-olive); }

.dp-timeline-year {
  font-family: var(--font-alt);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--dp-olive);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 0.3rem;
}

.dp-timeline-title {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  color: var(--dp-navy);
  margin-bottom: 0.3rem;
}

.dp-timeline-body {
  font-size: 0.88rem;
  color: var(--dp-text-2);
  line-height: 1.65;
}

/* ─── 12. Achievement Cards ────────────────────────────────── */
.dp-achievement-card {
  background: var(--dp-white);
  border: 1px solid var(--dp-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  transition: all var(--transition);
  height: 100%;
}
.dp-achievement-card:hover {
  border-color: var(--dp-navy);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.dp-achievement-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--dp-navy-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 1rem;
}

.dp-achievement-type {
  font-family: var(--font-alt);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--dp-olive);
  margin-bottom: 0.4rem;
}

.dp-achievement-title {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  color: var(--dp-navy);
  margin-bottom: 0.4rem;
  line-height: 1.35;
}

.dp-achievement-date {
  font-size: 0.8rem;
  color: var(--dp-text-muted);
  margin-bottom: 0.75rem;
}

.dp-achievement-desc {
  font-size: 0.875rem;
  color: var(--dp-text-2);
  line-height: 1.65;
}

/* Stat bars */
.dp-stat-item {
  margin-bottom: 1.5rem;
}
.dp-stat-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.4rem;
  font-size: 0.875rem;
  font-weight: 500;
}
.dp-stat-value {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--dp-navy);
}
.dp-stat-bar {
  height: 4px;
  background: var(--dp-gray-200);
  border-radius: 100px;
  overflow: hidden;
}
.dp-stat-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--dp-olive), var(--dp-navy));
  border-radius: 100px;
  width: 0;
  transition: width 1.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Numbers showcase */
.dp-number-showcase {
  text-align: center;
  padding: 2rem 1rem;
}
.dp-number-big {
  font-family: var(--font-heading);
  font-size: clamp(2.4rem, 5vw, 3.5rem);
  font-weight: 800;
  color: var(--dp-navy);
  line-height: 1;
  margin-bottom: 0.4rem;
}
.dp-number-label {
  font-size: 0.85rem;
  color: var(--dp-text-muted);
  font-family: var(--font-alt);
}

/* ─── 13. Quote Section ────────────────────────────────────── */
.dp-quote-section {
  background: var(--dp-navy);
  color: var(--dp-white);
  padding: var(--section-py) 0;
  position: relative;
  overflow: hidden;
}
.dp-quote-section::before {
  content: '"';
  font-family: var(--font-heading);
  font-size: 20rem;
  color: rgba(255,255,255,0.03);
  position: absolute;
  top: -4rem;
  left: -2rem;
  line-height: 1;
  pointer-events: none;
}

.dp-quote-text {
  font-family: var(--font-heading);
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 600;
  line-height: 1.5;
  color: var(--dp-white);
  font-style: italic;
  margin-bottom: 1.5rem;
}

.dp-quote-author {
  font-family: var(--font-alt);
  font-size: 0.85rem;
  color: rgba(255,255,255,0.6);
  letter-spacing: 0.06em;
}

/* ─── 14. CTA Section ──────────────────────────────────────── */
.dp-cta-section {
  background: var(--dp-beige);
  padding: var(--section-py) 0;
  border-top: 1px solid var(--dp-beige-dark);
}

.dp-cta-title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  color: var(--dp-navy);
  letter-spacing: -0.025em;
  margin-bottom: 1rem;
}

.dp-cta-sub {
  color: var(--dp-text-2);
  font-size: 1rem;
  margin-bottom: 2rem;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

/* ─── 15. Contact Form ─────────────────────────────────────── */
.dp-contact-form .form-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--dp-text);
  margin-bottom: 0.4rem;
  font-family: var(--font-body);
}

.dp-contact-form .form-control,
.dp-contact-form .form-select {
  border: 1.5px solid var(--dp-border);
  border-radius: var(--radius-sm);
  padding: 0.7rem 1rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--dp-text);
  background: var(--dp-white);
  transition: all var(--transition);
}
.dp-contact-form .form-control:focus,
.dp-contact-form .form-select:focus {
  border-color: var(--dp-navy);
  box-shadow: 0 0 0 3px rgba(27,42,74,0.08);
  outline: none;
}

.dp-contact-form textarea.form-control { min-height: 150px; resize: vertical; }

.dp-contact-info-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1.2rem 0;
  border-bottom: 1px solid var(--dp-border);
}
.dp-contact-info-item:last-child { border-bottom: none; }

.dp-contact-info-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--dp-navy-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1rem;
}

.dp-contact-info-label {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--dp-text-muted);
  margin-bottom: 0.2rem;
}
.dp-contact-info-value {
  font-size: 0.95rem;
  color: var(--dp-navy);
  font-weight: 500;
}

/* ─── 16. Single Post (Blog) ───────────────────────────────── */
.dp-single-hero {
  background: var(--dp-gray-100);
  padding: 7rem 0 4rem;
  border-bottom: 1px solid var(--dp-border);
}

.dp-single-meta {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  flex-wrap: wrap;
  font-size: 0.82rem;
  color: var(--dp-text-muted);
  font-family: var(--font-alt);
  margin-bottom: 1.25rem;
}

.dp-single-title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  line-height: 1.2;
  color: var(--dp-navy);
  letter-spacing: -0.025em;
  margin-bottom: 1.25rem;
}

.dp-single-excerpt {
  font-size: 1.1rem;
  color: var(--dp-text-2);
  line-height: 1.7;
  max-width: 640px;
}

.dp-single-content {
  max-width: 720px;
  margin: 0 auto;
  padding: 3.5rem 0 5rem;
}

.dp-single-content p {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--dp-text);
  margin-bottom: 1.5rem;
}

.dp-single-content h2 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.55rem;
  color: var(--dp-navy);
  margin-top: 2.5rem;
  margin-bottom: 1rem;
}

.dp-single-content h3 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--dp-navy);
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.dp-single-content blockquote {
  border-left: 3px solid var(--dp-olive);
  padding: 1rem 1.5rem;
  margin: 2rem 0;
  background: var(--dp-gray-50);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
  font-size: 1.05rem;
  color: var(--dp-text-2);
}

.dp-single-content pre,
.dp-single-content code {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.88rem;
}

.dp-single-content pre {
  background: var(--dp-navy);
  color: #e8f0fe;
  padding: 1.5rem;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: 1.5rem 0;
}

.dp-single-content code {
  background: var(--dp-gray-100);
  color: var(--dp-olive);
  padding: 0.15em 0.4em;
  border-radius: 3px;
  font-size: 0.88em;
}

.dp-single-content pre code {
  background: none;
  color: inherit;
  padding: 0;
}

.dp-single-content img {
  border-radius: var(--radius-md);
  margin: 2rem 0;
  max-width: 100%;
}

.dp-single-content ul, .dp-single-content ol {
  padding-left: 1.5rem;
  margin-bottom: 1.5rem;
}
.dp-single-content li {
  font-size: 1.05rem;
  line-height: 1.75;
  margin-bottom: 0.35rem;
  color: var(--dp-text);
}

.dp-single-cover {
  width: 100%;
  max-height: 480px;
  object-fit: cover;
  border-radius: var(--radius-md);
  margin-bottom: 3rem;
}

/* TOC */
.dp-toc {
  background: var(--dp-gray-100);
  border: 1px solid var(--dp-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin-bottom: 2.5rem;
}
.dp-toc-title {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--dp-text-muted);
  margin-bottom: 0.75rem;
}
.dp-toc ol { padding-left: 1.2rem; margin: 0; }
.dp-toc li { font-size: 0.9rem; margin-bottom: 0.3rem; }
.dp-toc a { color: var(--dp-navy); }
.dp-toc a:hover { color: var(--dp-olive); }

/* ─── 17. Single Research ──────────────────────────────────── */
.dp-research-hero {
  background: var(--dp-navy);
  color: var(--dp-white);
  padding: 8rem 0 5rem;
  position: relative;
  overflow: hidden;
}
.dp-research-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="90" cy="10" r="40" fill="rgba(255,255,255,0.02)"/></svg>');
}

.dp-research-section {
  padding: 2.5rem 0;
  border-bottom: 1px solid var(--dp-border);
}
.dp-research-section:last-child { border-bottom: none; }

.dp-research-section-label {
  font-family: var(--font-alt);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--dp-olive);
  margin-bottom: 1rem;
}

.dp-research-section-content {
  font-size: 1.02rem;
  line-height: 1.8;
  color: var(--dp-text);
}

.dp-citation-block {
  background: var(--dp-gray-100);
  border: 1px solid var(--dp-border);
  border-radius: var(--radius-sm);
  padding: 1.2rem 1.5rem;
  font-size: 0.85rem;
  color: var(--dp-text-2);
  font-family: 'JetBrains Mono', monospace;
  line-height: 1.65;
  position: relative;
}

/* ─── 18. Filter Bar ───────────────────────────────────────── */
.dp-filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--dp-border);
}

.dp-filter-btn {
  font-size: 0.82rem;
  font-weight: 500;
  padding: 0.4rem 1rem;
  border: 1.5px solid var(--dp-border);
  border-radius: 100px;
  background: var(--dp-white);
  color: var(--dp-text-2);
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-body);
}
.dp-filter-btn:hover,
.dp-filter-btn.active {
  border-color: var(--dp-navy);
  background: var(--dp-navy);
  color: var(--dp-white);
}

/* ─── 19. About Page ───────────────────────────────────────── */
.dp-about-hero {
  background: var(--dp-gray-100);
  padding: 7rem 0 5rem;
  border-bottom: 1px solid var(--dp-border);
}

.dp-about-portrait {
  width: 100%;
  max-width: 380px;
  border-radius: var(--radius-lg);
  object-fit: cover;
  aspect-ratio: 3/4;
  box-shadow: var(--shadow-lg);
}

.dp-about-section {
  padding: 3rem 0;
  border-bottom: 1px solid var(--dp-border);
}
.dp-about-section:last-child { border-bottom: none; }

.dp-skill-tag {
  display: inline-block;
  padding: 0.35rem 0.85rem;
  border: 1px solid var(--dp-border);
  border-radius: 100px;
  font-size: 0.82rem;
  color: var(--dp-text-2);
  background: var(--dp-white);
  margin: 0.25rem;
}

/* ─── 20. Footer ───────────────────────────────────────────── */
.dp-footer {
  background: var(--dp-navy);
  color: rgba(255,255,255,0.8);
  padding: 4rem 0 2rem;
}

.dp-footer-brand {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--dp-white);
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}
.dp-footer-brand span { color: rgba(255,255,255,0.5); }

.dp-footer-tagline {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.5);
  line-height: 1.65;
  max-width: 260px;
}

.dp-footer-heading {
  font-family: var(--font-alt);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
  margin-bottom: 1.1rem;
}

.dp-footer-nav { list-style: none; padding: 0; margin: 0; }
.dp-footer-nav li { margin-bottom: 0.55rem; }
.dp-footer-nav a {
  color: rgba(255,255,255,0.7);
  font-size: 0.9rem;
  transition: color var(--transition);
}
.dp-footer-nav a:hover { color: var(--dp-white); }

.dp-footer-divider {
  border-color: rgba(255,255,255,0.1);
  margin: 2.5rem 0 1.5rem;
}

.dp-footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.4);
}

.dp-social-links {
  display: flex;
  gap: 0.75rem;
}
.dp-social-link {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.6);
  font-size: 0.85rem;
  transition: all var(--transition);
  text-decoration: none;
}
.dp-social-link:hover {
  border-color: rgba(255,255,255,0.5);
  color: var(--dp-white);
  background: rgba(255,255,255,0.08);
}

/* ─── 21. Page Hero (generic) ──────────────────────────────── */
.dp-page-hero {
  background: linear-gradient(160deg, var(--dp-gray-100) 60%, var(--dp-beige) 100%);
  padding: 7.5rem 0 4rem;
  border-bottom: 1px solid var(--dp-border);
}

.dp-page-hero-label {
  font-family: var(--font-alt);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--dp-olive);
  margin-bottom: 0.75rem;
}

.dp-page-hero-title {
  font-family: var(--font-heading);
  font-weight: 800;
  color: var(--dp-navy);
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
}

.dp-page-hero-sub {
  font-size: 1.05rem;
  color: var(--dp-text-2);
  max-width: 560px;
  line-height: 1.7;
}

/* ─── 22. Breadcrumb ───────────────────────────────────────── */
.dp-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--dp-text-muted);
  margin-bottom: 1.5rem;
  font-family: var(--font-alt);
}
.dp-breadcrumb a { color: var(--dp-text-muted); }
.dp-breadcrumb a:hover { color: var(--dp-navy); }
.dp-breadcrumb-sep { opacity: 0.4; }

/* ─── 23. Pagination ───────────────────────────────────────── */
.dp-pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--dp-border);
}

.dp-page-link {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1.5px solid var(--dp-border);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--dp-text-2);
  transition: all var(--transition);
}
.dp-page-link:hover,
.dp-page-link.active {
  border-color: var(--dp-navy);
  background: var(--dp-navy);
  color: var(--dp-white);
}

/* ─── 24. 404 ──────────────────────────────────────────────── */
.dp-404 {
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 6rem 1rem;
}
.dp-404-number {
  font-family: var(--font-heading);
  font-size: clamp(6rem, 16vw, 10rem);
  font-weight: 800;
  color: var(--dp-gray-200);
  line-height: 1;
  margin-bottom: 1rem;
  letter-spacing: -0.05em;
}

/* ─── 25. Responsive ───────────────────────────────────────── */
@media (max-width: 991.98px) {
  :root { --section-py: 4.5rem; }

  .dp-hero { padding: 6rem 0 4rem; min-height: auto; }
  .dp-hero-image-wrap { margin-top: 3rem; }
  .dp-hero-badge { left: 0; }

  .dp-blog-featured { grid-template-columns: 1fr; }
}

@media (max-width: 767.98px) {
  :root { --section-py: 3.5rem; }

  .navbar-collapse {
    background: rgba(255,255,255,0.98);
    border: 1px solid var(--dp-border);
    border-radius: var(--radius-md);
    padding: 1rem;
    margin-top: 0.5rem;
  }

  .dp-hero-name { font-size: 2.4rem; }

  .dp-single-content {
    padding: 2.5rem 0 4rem;
  }

  .dp-footer .row > div { margin-bottom: 2rem; }
}

@media (max-width: 575.98px) {
  :root { --section-py: 3rem; }
  .dp-hero-cta { flex-direction: column; align-items: flex-start; }
  .dp-research-card-body { padding: 1.2rem; }
  .dp-blog-card-body { padding: 1.1rem 1.2rem; }
}

/* ─── 26. Print ────────────────────────────────────────────── */
@media print {
  #dp-navbar, .dp-footer, .dp-cta-section { display: none !important; }
  body { font-size: 12pt; }
  .dp-single-hero { padding-top: 2rem; }
}