/* ============================================================
   DESIGN SYSTEM VARIABLES (LIGHT/DARK THEMES)
   ============================================================ */
:root {
  /* Default: Light Theme (Soft cream paper, crimson accents) */
  --bg-primary: #f4f4f0;
  --bg-secondary: #ffffff;
  --text-primary: #121212;
  --text-secondary: #4b5563;
  --text-muted: #9ca3af;
  --accent: #b01a1a;
  --accent-hover: #c90000;
  --accent-glow: rgba(176, 26, 26, 0.08);
  --border-color: rgba(18, 18, 18, 0.1);
  --border-hover: rgba(18, 18, 18, 0.25);
  
  --font-serif: 'Playfair Display', Georgia, serif;
  --font-sans: 'Space Grotesk', 'Inter', -apple-system, sans-serif;
  --font-mono: 'IBM Plex Mono', 'Space Mono', monospace;
  
  --header-height: 80px;
  --transition-speed: 0.3s;
}

[data-theme="dark"] {
  /* Dark Theme (Charcoal, coral red accents) */
  --bg-primary: #0b0b0b;
  --bg-secondary: #161618;
  --text-primary: #f4f4f0;
  --text-secondary: #a1a1aa;
  --text-muted: #52525b;
  --accent: #ff6b6b;
  --accent-hover: #ff8787;
  --accent-glow: rgba(255, 107, 107, 0.08);
  --border-color: rgba(244, 244, 240, 0.1);
  --border-hover: rgba(244, 244, 240, 0.25);
}

/* ============================================================
   GLOBAL RESET & BASE STYLES
   ============================================================ */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  background-color: var(--bg-primary);
  transition: background-color var(--transition-speed);
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--transition-speed), color var(--transition-speed);
}

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

button {
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  color: inherit;
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

.mono {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 500;
  color: var(--accent);
}

.font-serif {
  font-family: var(--font-serif);
}

/* ============================================================
   FIXED NAVIGATION HEADER
   ============================================================ */
#main-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: rgba(244, 244, 240, 0.85); /* fallback */
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  z-index: 100;
  transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

[data-theme="dark"] #main-header {
  background-color: rgba(11, 11, 11, 0.85);
}

.header-inner {
  max-width: 1280px;
  height: 100%;
  margin: 0 auto;
  padding: 0 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  font-family: var(--font-serif);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}
.brand-logo:hover {
  color: var(--accent);
}

/* Navigation tabs links */
#header-nav ul {
  list-style: none;
  display: flex;
  gap: 32px;
}
#header-nav .nav-link {
  font-size: 14.5px;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 8px 0;
}
#header-nav .nav-link:hover {
  color: var(--text-primary);
}
#header-nav .nav-link.active {
  color: var(--accent);
  font-weight: 600;
}
#header-nav .nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--accent);
  border-radius: 2px;
}

/* Controls (Toggle & CTA) */
.header-controls {
  display: flex;
  align-items: center;
  gap: 20px;
}

/* Theme Toggle Button styling */
#theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  transition: background-color var(--transition-speed), border-color var(--transition-speed);
}
#theme-toggle:hover {
  background-color: rgba(18, 18, 18, 0.05);
  border-color: var(--text-primary);
}
[data-theme="dark"] #theme-toggle:hover {
  background-color: rgba(244, 244, 240, 0.05);
}

.toggle-icon {
  font-size: 16px;
  position: absolute;
  transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
[data-theme="light"] .sun-icon { transform: translateY(0); }
[data-theme="light"] .moon-icon { transform: translateY(40px); }
[data-theme="dark"] .sun-icon { transform: translateY(-40px); }
[data-theme="dark"] .moon-icon { transform: translateY(0); }

.btn-hire {
  font-family: var(--font-sans);
  font-size: 13.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background-color: var(--text-primary);
  color: var(--bg-primary);
  padding: 10px 20px;
  border-radius: 30px;
  transition: all var(--transition-speed);
}
.btn-hire:hover {
  background-color: var(--accent);
  color: #ffffff;
  transform: translateY(-1px);
}

/* ============================================================
   PAGE SECTIONS & PAGE CONTAINER SPA TRANSITIONS
   ============================================================ */
#main-container {
  width: 100%;
  min-height: 100vh;
  position: relative;
}

.page-section {
  display: none; /* Controlled via active class */
  padding: calc(var(--header-height) + 60px) 40px 80px;
  max-width: 1200px;
  margin: 0 auto;
  opacity: 0;
}

.page-section.active {
  display: block;
  animation: fade-in-slide 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes fade-in-slide {
  from {
    opacity: 0;
    transform: translateY(15px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Page Section headers */
.page-header {
  margin-bottom: 48px;
  text-align: center;
}
.section-kicker {
  display: block;
  font-size: 11px;
  margin-bottom: 12px;
}
.page-title {
  font-size: clamp(32px, 4vw, 44px);
  font-weight: 700;
  line-height: 1.15;
  color: var(--text-primary);
  margin-bottom: 12px;
  letter-spacing: -0.015em;
}
.page-subtitle {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ============================================================
   PAGE 1: ABOUT (HERO + BIO LAYOUT)
   ============================================================ */
.hero-container {
  min-height: 50vh;
  display: flex;
  align-items: center;
  padding: 40px 0;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 60px;
}
.hero-content {
  max-width: 860px;
}
.hero-kicker {
  margin-bottom: 16px;
}
.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(40px, 6vw, 68px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 24px;
}
.hero-description {
  font-size: clamp(18px, 2.5vw, 22px);
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 36px;
  font-weight: 400;
}

.hero-actions {
  display: flex;
  gap: 16px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border-radius: 30px;
  font-size: 14.5px;
  font-weight: 600;
  transition: all var(--transition-speed);
}
.btn-primary {
  background-color: var(--accent);
  color: #ffffff;
}
.btn-primary:hover {
  background-color: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--accent-glow);
}
.btn-secondary {
  background-color: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}
.btn-secondary:hover {
  border-color: var(--text-primary);
  background-color: rgba(18, 18, 18, 0.02);
  transform: translateY(-2px);
}
[data-theme="dark"] .btn-secondary:hover {
  background-color: rgba(244, 244, 240, 0.02);
}

/* Quick Metrics telemetries block */
.metrics-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
  margin-bottom: 60px;
}
.metric-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 30px;
  transition: transform var(--transition-speed), border-color var(--transition-speed);
}
.metric-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
}
.metric-title {
  font-size: clamp(20px, 2.5vw, 24px);
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 10px;
}
.metric-desc {
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Narrative Grid section */
.narrative-grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 60px;
  padding: 40px 0;
}
.narrative-left .section-title {
  font-size: clamp(24px, 3.5vw, 36px);
  font-weight: 600;
  line-height: 1.2;
  color: var(--text-primary);
}
.narrative-right .bio-text {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.65;
}

.profile-portrait-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 30px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.02);
  transition: border-color var(--transition-speed);
}
.profile-portrait-card:hover {
  border-color: var(--accent);
}
.profile-portrait-img {
  width: 100%;
  max-width: 240px;
  height: 240px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--accent);
  box-shadow: 0 4px 20px var(--accent-glow);
}
.profile-portrait-card .badge {
  display: inline-block;
  font-size: 10px;
  background-color: var(--accent-glow);
  color: var(--accent);
  padding: 4px 12px;
  border-radius: 20px;
  border: 1px solid rgba(176, 26, 26, 0.15);
}
.bio-text.academic-focus {
  font-weight: 500;
  font-style: italic;
  border-left: 2px solid var(--accent);
  padding-left: 16px;
  margin-top: 24px;
}

/* ============================================================
   PAGE 2: PROJECTS (BENTO GRID STYLE)
   ============================================================ */
/* Interactive Drop-down Categories Accordion */
.projects-categories-wrapper {
  display: flex;
  flex-direction: column;
  gap: 20px;
  max-width: 1000px;
  margin: 0 auto;
}

.project-category-box {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  overflow: hidden;
  transition: border-color var(--transition-speed), box-shadow var(--transition-speed);
}
.project-category-box:hover {
  border-color: var(--accent);
}
.project-category-box.expanded {
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.03);
}
[data-theme="dark"] .project-category-box.expanded {
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3);
}

.category-header {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 32px;
  text-align: left;
  cursor: pointer;
  background-color: var(--bg-secondary);
  transition: background-color var(--transition-speed);
}
.category-header:hover {
  background-color: rgba(18, 18, 18, 0.01);
}
[data-theme="dark"] .category-header:hover {
  background-color: rgba(244, 244, 240, 0.01);
}

.category-header h3 {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
}
.category-header:hover h3 {
  color: var(--accent);
}

.category-count {
  font-family: var(--font-mono);
  font-size: 11px;
  background-color: var(--accent-glow);
  color: var(--accent);
  border: 1px solid rgba(176, 26, 26, 0.15);
  padding: 4px 12px;
  border-radius: 20px;
  margin-left: 16px;
}

.category-chevron {
  font-size: 18px;
  color: var(--text-secondary);
  transition: transform 0.3s ease, color var(--transition-speed);
}
.project-category-box.expanded .category-chevron {
  transform: rotate(180deg);
  color: var(--accent);
}

.category-content {
  display: none;
  padding: 32px;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
}
.project-category-box.expanded .category-content {
  display: block;
  animation: accordion-fade-in 0.4s ease forwards;
}

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

/* Bento grid columns spans */
.projects-bento-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
}

.bento-card {
  grid-column: span 4; /* Default span */
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 32px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 300px;
  transition: all var(--transition-speed) ease;
}
.bento-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.05);
}
[data-theme="dark"] .bento-card:hover {
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
}

/* Custom spans for interesting bento geometry */
.bento-card.span-8 {
  grid-column: span 8;
}
.bento-card.span-6 {
  grid-column: span 6;
}

.bento-card-top {
  margin-bottom: 24px;
}
.bento-card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}
.bento-card-date {
  font-size: 11px;
  color: var(--text-muted);
}
.bento-card h3 {
  font-family: var(--font-serif);
  font-size: clamp(20px, 2.5vw, 24px);
  font-weight: 600;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: 10px;
  transition: color var(--transition-speed);
}
.bento-card:hover h3 {
  color: var(--accent);
}
.bento-card-summary {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Metric badge in card bottom */
.bento-card-metric {
  display: inline-flex;
  align-items: baseline;
  gap: 5px;
  background-color: var(--accent-glow);
  padding: 6px 12px;
  border-radius: 6px;
  margin-bottom: 16px;
  width: fit-content;
}
.bento-card-metric-val {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
}
.bento-card-metric-lbl {
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
}

.bento-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.bento-card-tag {
  font-size: 11px;
  background: rgba(18, 18, 18, 0.03);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 2px 8px;
  border-radius: 4px;
}
[data-theme="dark"] .bento-card-tag {
  background: rgba(244, 244, 240, 0.03);
}

.bento-card-arrow {
  text-align: right;
  font-size: 14px;
  color: var(--accent);
  opacity: 0;
  transform: translateX(-6px);
  transition: all var(--transition-speed);
}
.bento-card:hover .bento-card-arrow {
  opacity: 1;
  transform: translateX(0);
}

/* ============================================================
   PAGE 3: TECHNICAL SKILLS
   ============================================================ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}
.skills-group-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 36px;
}
.skills-group-card h3 {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 20px;
  border-bottom: 1.5px solid var(--border-color);
  padding-bottom: 10px;
}
.skills-badge-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.skill-badge {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 500;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 5px 12px;
  border-radius: 6px;
  transition: all var(--transition-speed);
}
.skill-badge:hover {
  border-color: var(--accent);
  color: var(--accent);
  background-color: var(--accent-glow);
}

/* ============================================================
   PAGE 4: TIMELINE (EXPERIENCE & COURSEWORK)
   ============================================================ */
.experience-timeline {
  position: relative;
  max-width: 860px;
  margin: 0 auto 60px;
}
.experience-timeline::before {
  content: '';
  position: absolute;
  left: 120px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background-color: var(--border-color);
}

.timeline-item {
  display: flex;
  position: relative;
  margin-bottom: 40px;
}
.timeline-left {
  width: 100px;
  flex-shrink: 0;
  text-align: right;
  padding-top: 6px;
}
.timeline-date {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.05em;
}
.timeline-center {
  width: 40px;
  flex-shrink: 0;
  display: flex;
  justify-content: center;
  position: relative;
}
.timeline-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--accent);
  border: 2px solid var(--bg-primary);
  position: absolute;
  top: 10px;
  z-index: 2;
}

.timeline-right {
  flex-grow: 1;
  padding-left: 20px;
}
.timeline-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 30px;
  transition: border-color var(--transition-speed);
}
.timeline-card:hover {
  border-color: var(--accent);
}
.timeline-card h3 {
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}
.timeline-org {
  font-size: 12.5px;
  color: var(--text-secondary);
  margin-bottom: 12px;
  font-weight: 500;
}
.timeline-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.55;
}


/* ============================================================
   PAGE 5: CONTACT & FOOTER
   ============================================================ */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 60px;
}

.contact-info-col h3 {
  font-size: clamp(24px, 3.5vw, 32px);
  line-height: 1.2;
  color: var(--text-primary);
  margin-bottom: 20px;
}
.contact-info-col p {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 30px;
}

.contact-links-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.contact-link-node {
  display: flex;
  align-items: center;
  gap: 14px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 14px 20px;
  border-radius: 10px;
  transition: all var(--transition-speed);
}
.contact-link-node .icon {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  background-color: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--accent);
}
.contact-link-node .text {
  font-size: 12px;
  color: var(--text-primary);
}
.contact-link-node:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

/* Contact form styling */
.contact-form-col {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 40px;
}
.form-kicker {
  margin-bottom: 24px;
}
.form-group {
  margin-bottom: 20px;
}
.form-group label {
  display: block;
  font-size: 10px;
  color: var(--text-secondary);
  margin-bottom: 6px;
}
.contact-form-col input, .contact-form-col textarea {
  width: 100%;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 12px 16px;
  font-size: 14px;
  color: var(--text-primary);
  font-family: inherit;
  transition: all var(--transition-speed);
}
.contact-form-col input:focus, .contact-form-col textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 10px var(--accent-glow);
}
.contact-form-col input::placeholder, .contact-form-col textarea::placeholder {
  color: var(--text-muted);
  opacity: 0.6;
}

#contact-status {
  font-size: 11px;
  margin-top: 14px;
  text-align: center;
}
#contact-status.success { color: #10b981; }
#contact-status.error { color: #ef4444; }

/* FOOTER */
#main-footer {
  margin-top: 80px;
  border-top: 1px solid var(--border-color);
  padding: 40px 0;
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.footer-inner p {
  color: var(--text-muted);
}
.footer-socials {
  display: flex;
  gap: 20px;
}
.footer-socials a {
  font-size: 13.5px;
  font-weight: 500;
  color: var(--text-secondary);
}
.footer-socials a:hover {
  color: var(--accent);
}

/* ============================================================
   PROJECT DETAILED MODAL VIEWER
   ============================================================ */
.modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.modal.open {
  display: flex;
}
.modal-backdrop {
  position: absolute;
  inset: 0;
  background-color: rgba(11, 11, 11, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.modal-content-wrapper {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  width: 100%;
  max-width: 900px;
  max-height: 85vh;
  overflow-y: auto;
  position: relative;
  z-index: 205;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.15);
  animation: modal-slide-in 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}
[data-theme="dark"] .modal-content-wrapper {
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.5);
}

@keyframes modal-slide-in {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.modal-close {
  position: absolute;
  top: 15px;
  right: 20px;
  font-size: 28px;
  color: var(--text-secondary);
  z-index: 210;
  transition: color var(--transition-speed);
}
.modal-close:hover {
  color: var(--accent);
}

.modal-body {
  padding: 40px;
}

.modal-header-section {
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 20px;
}
.modal-header-section .mono {
  margin-bottom: 6px;
  display: block;
}
.modal-header-title {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.25;
}
.modal-header-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.modal-header-tag {
  font-size: 11px;
  background-color: var(--accent-glow);
  border: 1px solid rgba(176, 26, 26, 0.15);
  color: var(--accent);
  padding: 2px 8px;
  border-radius: 4px;
}

.modal-detail-grid {
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  gap: 30px;
}

.sar-container {
  margin-bottom: 20px;
  border-left: 2px solid var(--border-color);
  padding-left: 16px;
}
.sar-container:hover {
  border-left-color: var(--accent);
}
.sar-container h4 {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--accent);
  margin-bottom: 6px;
  letter-spacing: 0.05em;
}
.sar-container p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Right media / benchmarks columns */
.modal-media-col {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.video-wrapper {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background-color: #000;
}
.video-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.detail-img-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}
.detail-img-grid.two-cols {
  grid-template-columns: 1fr 1fr;
}
.detail-img-grid img {
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  cursor: zoom-in;
  transition: border-color var(--transition-speed);
}
.detail-img-grid img:hover {
  border-color: var(--accent);
}

.modal-benchmarks-box {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 20px;
}
.modal-benchmarks-box h4 {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-secondary);
  margin-bottom: 12px;
}
.modal-benchmarks-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.modal-benchmark-item {
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.modal-benchmark-val {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--accent);
  min-width: 70px;
  flex-shrink: 0;
}
.modal-benchmark-lbl {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* Lightbox zoom utilities */
.lightbox-overlay {
  position: fixed;
  inset: 0;
  z-index: 300;
  background-color: rgba(11, 11, 11, 0.95);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
  cursor: zoom-out;
}
.lightbox-overlay.active {
  opacity: 1;
}
.lightbox-img {
  max-width: 90vw;
  max-height: 90vh;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  transform: scale(0.95);
  transition: transform 0.3s ease;
}
.lightbox-overlay.active .lightbox-img {
  transform: scale(1);
}
.lightbox-close {
  position: absolute;
  top: 20px;
  right: 25px;
  font-size: 32px;
  color: #ffffff;
}

/* ============================================================
   RESPONSIVE LAYOUTS & MOBILE COMPATIBILITIES
   ============================================================ */

/* Mobile Hamburger Menu */
.mobile-toggle {
  display: none;
  width: 40px;
  height: 40px;
  position: relative;
  justify-content: center;
  align-items: center;
}
.hamburger {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--text-primary);
  position: relative;
  transition: background-color var(--transition-speed);
}
.hamburger::before, .hamburger::after {
  content: '';
  position: absolute;
  width: 22px;
  height: 2px;
  background-color: var(--text-primary);
  transition: all var(--transition-speed);
}
.hamburger::before { top: -6px; }
.hamburger::after { bottom: -6px; }

/* Active mobile hamburger */
#mobile-menu-btn.active .hamburger {
  background-color: transparent;
}
#mobile-menu-btn.active .hamburger::before {
  transform: rotate(45deg);
  top: 0;
}
#mobile-menu-btn.active .hamburger::after {
  transform: rotate(-45deg);
  bottom: 0;
}

/* SCALING AT 1024px */
@media (max-width: 1024px) {
  .header-inner {
    padding: 0 24px;
  }
  
  .projects-bento-grid {
    grid-template-columns: repeat(6, 1fr);
  }
  .bento-card {
    grid-column: span 3;
  }
  .bento-card.span-8, .bento-card.span-6 {
    grid-column: span 6;
  }
  
  .narrative-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
}

/* MOBILE RESPONSIVE AT 768px */
@media (max-width: 768px) {
  #header-nav {
    display: none; /* Controlled dynamically in mobile */
    position: absolute;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 24px 40px;
  }
  #header-nav.active {
    display: block;
    animation: fade-in-slide 0.3s ease forwards;
  }
  #header-nav ul {
    flex-direction: column;
    gap: 16px;
  }
  
  .mobile-toggle {
    display: flex;
  }
  
  .page-section {
    padding: calc(var(--header-height) + 30px) 24px 60px;
  }
  
  .hero-container {
    min-height: auto;
    padding: 20px 0;
  }
  
  .metrics-container {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  
  .projects-bento-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .bento-card, .bento-card.span-8, .bento-card.span-6 {
    grid-column: span 1 !important;
    min-height: auto;
    padding: 24px;
  }
  
  .experience-timeline::before {
    left: 20px;
  }
  .timeline-left {
    display: none; /* Hide date column on mobile left */
  }
  .timeline-center {
    width: 40px;
    justify-content: flex-start;
    padding-left: 15px;
  }
  .timeline-dot {
    left: 15px;
  }
  .timeline-right {
    padding-left: 0;
  }
  .timeline-card {
    padding: 24px;
  }
  /* Show date inline on mobile card */
  .timeline-card::before {
    content: attr(data-date);
    display: block;
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--accent);
    margin-bottom: 6px;
    letter-spacing: 0.05em;
  }
  
  .contact-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .contact-form-col {
    padding: 24px;
  }
  
  .modal-detail-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .modal-body {
    padding: 24px;
  }
  .modal-header-title {
    font-size: 22px;
  }
  
  .footer-inner {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}