/* ===================================================================
   THEME B - AI RESEARCH PORTFOLIO DESIGN SYSTEM
   Dev Charan Sai P
   =================================================================== */

/* ===================================================================
   1. DESIGN TOKENS
   =================================================================== */

:root {
  /* Typography Scale */
  --text-xs: clamp(0.7rem, 0.65rem + 0.25vw, 0.8rem);
  --text-sm: clamp(0.8rem, 0.75rem + 0.25vw, 0.925rem);
  --text-base: clamp(0.9rem, 0.85rem + 0.25vw, 1rem);
  --text-lg: clamp(1rem, 0.9rem + 0.5vw, 1.25rem);
  --text-xl: clamp(1.25rem, 1rem + 0.75vw, 1.75rem);
  --text-2xl: clamp(1.5rem, 1rem + 1.5vw, 2.5rem);
  --text-3xl: clamp(1.875rem, 0.75rem + 2.5vw, 3.5rem);
  --text-hero: clamp(2.25rem, 0.25rem + 5vw, 5.5rem);

  /* Spacing Scale (4px base) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;
  --space-64: 32rem;

  /* Font Families */
  --font-display: 'Boska', Georgia, serif;
  --font-body: 'Satoshi', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'Courier New', Courier, monospace;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-base: 250ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 400ms cubic-bezier(0.16, 1, 0.3, 1);
  --ease-standard: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-emphasized: cubic-bezier(0.05, 0.7, 0.1, 1);

  /* Content Widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;
  --content-full: 100%;

  /* Z-Index Scale */
  --z-below: -1;
  --z-base: 0;
  --z-dropdown: 1000;
  --z-sticky: 1100;
  --z-modal-backdrop: 2000;
  --z-modal: 2100;
}

/* ===================================================================
   2. THEME DEFINITIONS
   =================================================================== */

/* Light Mode (Default) */
:root,
[data-theme="light"] {
  /* Surfaces - Pearl / Frosted Steel */
  --color-bg: #f7f8fa;
  --color-surface: #ffffff;
  --color-surface-2: #fafbfc;
  --color-surface-raised: #ffffff;
  --color-surface-glass: rgba(255, 255, 255, 0.7);

  /* Text */
  --color-text: #1a1d2e;
  --color-text-muted: #5c6370;
  --color-text-faint: #9ca3af;
  --color-text-inverse: #ffffff;

  /* Accent - Teal/Cyan */
  --color-primary: #0891b2;
  --color-primary-hover: #0e7490;
  --color-primary-active: #155e75;
  --color-primary-glow: rgba(8, 145, 178, 0.2);

  /* Borders */
  --color-border: rgba(26, 29, 46, 0.1);
  --color-border-soft: rgba(26, 29, 46, 0.06);
  --color-edge-glow: rgba(8, 145, 178, 0.15);

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.12);
  --shadow-glow: 0 0 20px var(--color-primary-glow);
  --shadow-glow-strong: 0 0 40px var(--color-primary-glow);
}

/* Dark Mode */
[data-theme="dark"] {
  /* Surfaces - Obsidian / Graphite */
  --color-bg: #0f1117;
  --color-surface: #1a1d2e;
  --color-surface-2: #212433;
  --color-surface-raised: #2a2d3e;
  --color-surface-glass: rgba(26, 29, 46, 0.7);

  /* Text */
  --color-text: #e4e7eb;
  --color-text-muted: #9ca3af;
  --color-text-faint: #5c6370;
  --color-text-inverse: #0f1117;

  /* Accent - Brighter Cyan */
  --color-primary: #22d3ee;
  --color-primary-hover: #06b6d4;
  --color-primary-active: #0891b2;
  --color-primary-glow: rgba(34, 211, 238, 0.25);

  /* Borders */
  --color-border: rgba(228, 231, 235, 0.1);
  --color-border-soft: rgba(228, 231, 235, 0.05);
  --color-edge-glow: rgba(34, 211, 238, 0.2);

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px var(--color-primary-glow);
  --shadow-glow-strong: 0 0 60px var(--color-primary-glow);
}

/* System Preference Fallback */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #0f1117;
    --color-surface: #1a1d2e;
    --color-surface-2: #212433;
    --color-surface-raised: #2a2d3e;
    --color-surface-glass: rgba(26, 29, 46, 0.7);
    --color-text: #e4e7eb;
    --color-text-muted: #9ca3af;
    --color-text-faint: #5c6370;
    --color-text-inverse: #0f1117;
    --color-primary: #22d3ee;
    --color-primary-hover: #06b6d4;
    --color-primary-active: #0891b2;
    --color-primary-glow: rgba(34, 211, 238, 0.25);
    --color-border: rgba(228, 231, 235, 0.1);
    --color-border-soft: rgba(228, 231, 235, 0.05);
    --color-edge-glow: rgba(34, 211, 238, 0.2);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px var(--color-primary-glow);
    --shadow-glow-strong: 0 0 60px var(--color-primary-glow);
  }
}

/* ===================================================================
   3. BASE & RESET
   =================================================================== */

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

html {
  -moz-text-size-adjust: none;
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: var(--space-20);
}

body {
  min-height: 100vh;
  line-height: 1.6;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color var(--transition-slow), color var(--transition-slow);
}

main {
  flex: 1 0 auto;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

ul[role="list"],
ol[role="list"] {
  list-style: none;
}

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

h1, h2, h3, h4, h5, h6 {
  text-wrap: balance;
  line-height: 1.15;
  font-weight: 600;
}

p, li, figcaption {
  text-wrap: pretty;
  max-width: 72ch;
}

::selection {
  background: var(--color-primary-glow);
  color: var(--color-text);
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

button {
  cursor: pointer;
  background: none;
  border: none;
}

table {
  border-collapse: collapse;
  width: 100%;
}

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

/* Interactive Element Transitions */
a, button, [role="button"], [role="link"], input, textarea, select {
  transition: color var(--transition-base),
              background var(--transition-base),
              border-color var(--transition-base),
              box-shadow var(--transition-base),
              transform var(--transition-base);
}

/* Screen Reader Only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Skip Link */
.skip-link {
  position: absolute;
  top: var(--space-2);
  left: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-radius: var(--radius-md);
  font-weight: 600;
  z-index: 9999;
  transform: translateY(-200%);
  transition: transform var(--transition-base);
}

.skip-link:focus {
  transform: translateY(0);
}

/* ===================================================================
   4. LAYOUT & CONTAINERS
   =================================================================== */

.container {
  width: 100%;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.container-fluid {
  width: 100%;
  padding-inline: var(--space-4);
}

.section {
  padding-block: clamp(var(--space-16), 8vw, var(--space-32));
}

@media (min-width: 768px) {
  .container {
    padding-inline: var(--space-8);
  }
  .container-fluid {
    padding-inline: var(--space-8);
  }
}

/* ===================================================================
   5. TYPOGRAPHY
   =================================================================== */

h1, h2, h3 {
  font-family: var(--font-display);
}

h1 {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-6);
}

h2 {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-5);
}

h3 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-4);
}

h4 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-3);
}

p {
  margin-bottom: var(--space-4);
}

.lead-text {
  font-size: var(--text-lg);
  line-height: 1.7;
  color: var(--color-text);
}

.section-title {
  /* border: 2px solid red; */
  text-align: center;
  margin-bottom: var(--space-12);
  position: relative;
  top: 0;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: calc(-1 * var(--space-4));
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--color-primary), transparent);
  border-radius: var(--radius-full);
}

.page-title {
  font-size: var(--text-3xl);
  text-align: center;
  margin-bottom: var(--space-4);
}

.page-subtitle {
  font-size: var(--text-lg);
  text-align: center;
  color: var(--color-text-muted);
  max-width: 600px;
  margin-inline: auto;
  margin-bottom: var(--space-8);
}

/* ===================================================================
   6. NAVIGATION
   =================================================================== */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  background: var(--color-surface-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-soft);
  transition: all var(--transition-base);
}

.navbar.scrolled {
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-sm);
}

.nav-container {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding: var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
}

.nav-brand svg {
  color: var(--color-primary);
  transition: transform var(--transition-base);
}

.nav-brand:hover svg {
  transform: rotate(5deg) scale(1.05);
}

.nav-menu {
  display: flex;
  gap: var(--space-6);
  list-style: none;
}

.nav-link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: var(--space-3);
  right: var(--space-3);
  height: 2px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.theme-toggle {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--color-text);
  background: transparent;
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.theme-toggle:hover {
  background: var(--color-surface-2);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.nav-toggle span {
  width: 20px;
  height: 2px;
  background: var(--color-text);
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
}

/* Mobile Navigation */
@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--color-surface-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: var(--space-6) var(--space-4);
    gap: var(--space-2);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-base);
  }

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

  .nav-toggle {
    display: flex;
  }

  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }
}

/* ===================================================================
   7. SHARED COMPONENTS
   =================================================================== */

/* Glass Panel */
.glass-panel {
  background: var(--color-surface-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-md);
}

/* Glass Card */
.glass-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  transition: all var(--transition-base);
}

.glass-card:hover {
  border-color: var(--color-edge-glow);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  cursor: pointer;
  border: none;
  text-decoration: none;
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.btn--primary:hover {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

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

.btn--outline:hover {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

/* Badge Chips */
.badge-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-primary);
}

/* Tag Chips */
.tag-chip {
  display: inline-block;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 500;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
}

.tag-chip:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* ===================================================================
   8. HERO SECTION
   =================================================================== */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 80px;
}

.hero-background {
  position: absolute;
  inset: 0;
  z-index: var(--z-below);
  overflow: hidden;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(var(--color-border-soft) 1px, transparent 1px),
                    linear-gradient(90deg, var(--color-border-soft) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.3;
  animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
  0% { transform: translate(0, 0); }
  100% { transform: translate(40px, 40px); }
}

.hero-glow {
  position: absolute;
  top: -50%;
  left: -50%;
  right: -50%;
  bottom: -50%;
  background: radial-gradient(circle at 50% 50%, var(--color-primary-glow), transparent 70%);
  animation: glowPulse 8s ease-in-out infinite;
}

@keyframes glowPulse {
  0%, 100% { opacity: 0.3; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.1); }
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-12);
  align-items: center;
  position: relative;
  z-index: 1;
}

@media (min-width: 768px) {
  .hero-content {
    grid-template-columns: 1.2fr 1fr;
  }
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--color-surface-glass);
  border: 1px solid var(--color-edge-glow);
  border-radius: var(--radius-full);
  color: var(--color-primary);
  margin-bottom: var(--space-4);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.hero-title {
  font-size: var(--text-hero);
  margin-bottom: var(--space-4);
  line-height: 1.1;
  background: linear-gradient(135deg, var(--color-text), var(--color-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: var(--text-xl);
  font-family: 'Times New Roman', Times, serif;
  color: var(--color-primary);
  margin-bottom: var(--space-6);
  font-weight: 600;
  min-height: 2.5rem;
}

.hero-description {
  font-size: var(--text-lg);
  font-family: 'Times New Roman', Times, serif;
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.stat-chip {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  font-weight: 600;
  transition: all var(--transition-base);
}

.stat-chip:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
}

.stat-chip i {
  color: var(--color-primary);
  font-size: var(--text-base);
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.portrait-container {
  position: relative;
  width: 350px;
  height: 350px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.portrait-glow {
  position: absolute;
  inset: -20%;
  background: radial-gradient(circle, var(--color-primary-glow), transparent 70%);
  animation: portraitGlow 4s ease-in-out infinite;
}

@keyframes portraitGlow {
  0%, 100% { opacity: 0.4; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.05); }
}

.portrait-frame {
  position: relative;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid var(--color-primary);
  box-shadow: var(--shadow-glow-strong);
  z-index: 1;
}

.portrait-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.orbit-ring {
  position: absolute;
  inset: -10px;
  border: 2px solid var(--color-edge-glow);
  border-radius: 50%;
  animation: orbitRotate 20s linear infinite;
}

@keyframes orbitRotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* ===================================================================
   9. ABOUT SECTION
   =================================================================== */

.about-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-12);
  align-items: start;
}

@media (min-width: 768px) {
  .about-content {
    grid-template-columns: 1.2fr 1fr;
  }
}

.about-narrative p {
  margin-bottom: var(--space-6);
  font-size: var(--text-lg);
  font-family: 'Times New Roman', Times, serif;
  line-height: 1.8;
}

.about-narrative .lead-text {
  font-size: var(--text-lg);
  font-family: 'Times New Roman', Times, serif;
  line-height: 1.8;
}

.about-credentials {
  display: grid;
  gap: var(--space-4);
}

.credential-card {
  display: flex;
  gap: var(--space-4);
  padding: var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.credential-card:hover {
  border-color: var(--color-edge-glow);
  box-shadow: var(--shadow-glow);
  transform: translateX(4px);
}

.credential-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-glow);
  border-radius: var(--radius-md);
  color: var(--color-primary);
  font-size: var(--text-xl);
  flex-shrink: 0;
}

.credential-content h4 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-2);
}

.credential-content p {
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.credential-meta {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}


/* ===============================
   NEW SKILLS GRID (2x2)
================================ */

.skills-grid-new {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

@media (max-width: 768px) {
  .skills-grid-new {
    grid-template-columns: 1fr;
  }
}

.skill-box {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  transition: all var(--transition-base);
}

.skill-box:hover {
  border-color: var(--color-edge-glow);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

.skill-box h3 {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  font-size: var(--text-xl);
}

.skill-box h3 i {
  color: var(--color-primary);
}

.skill-box .skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.skill-box .skill-tags span {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-base);
  font-weight: 500;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
}

.skill-box .skill-tags span:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
}


/* ===================================================================
   11. FEATURED PROJECTS SECTION (Marquee Rail)
   =================================================================== */

.featured-projects {
  position: relative;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-8);
}

.section-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-primary);
  transition: gap var(--transition-base);
}

.section-link:hover {
  gap: var(--space-3);
}

.featured-projects,
.projects-rail-wrapper,
.container-fluid {
  overflow-x: hidden;
}

.projects-rail {
  will-change: transform;
}

.projects-rail-wrapper {
  overflow: hidden;
  position: relative;
  margin-inline: calc(-1 * var(--space-4));
}

.projects-rail {
  display: flex;
  gap: var(--space-6);
  animation: marquee 40s linear infinite;
  width: fit-content;
}

.projects-rail:hover {
  animation-play-state: paused;
}

@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

.project-preview-card {
  flex-shrink: 0;
  width: 400px;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  transition: all var(--transition-base);
  cursor: pointer;
}

.project-preview-card:hover {
  border-color: var(--color-edge-glow);
  box-shadow: var(--shadow-glow);
  transform: translateY(-4px);
}

.project-preview-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-4);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.project-preview-title {
  font-size: var(--text-xl);
  margin-bottom: var(--space-3);
  color: var(--color-text);
}

.project-preview-summary {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  line-height: 1.6;
}

.project-preview-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.project-preview-footer {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-primary);
  font-weight: 600;
}

/* ===================================================================
   12. FEATURED CERTIFICATES SECTION
   =================================================================== */

.certificates-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
}

.cert-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
}

.cert-card:hover {
  border-color: var(--color-edge-glow);
  box-shadow: var(--shadow-glow);
  transform: translateY(-4px);
}

.cert-preview {
  height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface-2);
  color: var(--color-primary);
  font-size: 3rem;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  position: relative;
  overflow: hidden;
}

.cert-preview img {
  width: auto;
  height: auto;
  object-fit: contain;
  display: block;
}

.cert-content {
  padding: var(--space-5);
}

.cert-content h4 {
  font-size: var(--text-base);
  margin-bottom: var(--space-2);
  line-height: 1.4;
}

.cert-issuer {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-1);
}

.cert-date {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-bottom: var(--space-3);
}

.cert-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-primary);
}

.cert-link:hover {
  text-decoration: underline;
}

/* ===============================
   LEADERSHIP TIMELINE (Marquee Rail)
================================ */

.timeline-rail-wrapper {
  position: relative;
  overflow: hidden;
  padding-block: var(--space-8);
  margin-inline: calc(-1 * var(--space-4)); /* Reaches edges of screen */
}

/* The continuous glowing line passing through the cards */
.timeline-background-line {
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-primary-glow);
  transform: translateY(-50%);
  z-index: 1;
}

.timeline-rail {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  width: max-content;
  animation: marquee 35s linear infinite;
  position: relative;
  z-index: 2; /* Sits above the background line */
  padding-right: var(--space-6);  
}

.timeline-card:nth-child(5),
.timeline-card:nth-child(10) {
  margin-right: var(--space-64); /* You can change this to space-16 or space-32 to adjust the gap size */
}

.timeline-rail:hover {
  animation-play-state: paused;
}

.timeline-card {
  flex-shrink: 0;
  width: 320px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-sm);
}

.timeline-card:hover {
  border-color: var(--color-edge-glow);
  box-shadow: var(--shadow-glow);
  transform: translateY(-4px);
}

/* Highlighted specific roles (e.g., President) */
.timeline-card--highlight {
  border-color: var(--color-primary);
  background: var(--color-surface-2);
}

.timeline-card h4 {
  font-size: var(--text-lg);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.timeline-card .timeline-date {
  display: inline-block;
  font-size: var(--text-xs);
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: var(--space-3);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

@media (max-width: 768px) {
  .timeline-card {
    width: 280px; /* Slightly smaller cards on mobile */
  }
}


/* ===================================================================
   14. CONTACT SECTION
   =================================================================== */

.contact-content {
  max-width: 900px;
  margin-inline: auto;
}

.contact-intro {
  text-align: center;
  margin-bottom: var(--space-12);
}

.contact-intro p {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 600px;
  margin-inline: auto;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-6);
}

.contact-card {
  display: flex;
  gap: var(--space-4);
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  transition: all var(--transition-base);
  text-decoration: none;
}

.contact-card:hover {
  border-color: var(--color-edge-glow);
  box-shadow: var(--shadow-glow);
  transform: translateY(-4px);
}

.contact-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-glow);
  border-radius: var(--radius-lg);
  color: var(--color-primary);
  font-size: var(--text-2xl);
  flex-shrink: 0;
}

.contact-details h4 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-2);
  color: var(--color-text);
}

.contact-details p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin: 0;
}

/* ===================================================================
   15. PAGE HERO (Projects & Certificates Pages)
   =================================================================== */

.page-hero {
  position: relative;
  overflow: hidden;
  padding-top: clamp(var(--space-20), 12vw, var(--space-32));
  padding-bottom: var(--space-16);
  text-align: center;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.project-counters {
  display: flex;
  justify-content: center;
  gap: var(--space-8);
  flex-wrap: wrap;
  margin-top: var(--space-8);
}

.counter-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

.counter-value {
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-primary);
  font-family: var(--font-display);
}

.counter-label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-weight: 500;
}

/* ===================================================================
   16. FILTERS SECTION
   =================================================================== */

.filters-section {
  padding-block: var(--space-8);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 72px;
  z-index: var(--z-dropdown);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: center;
}

.filter-chip {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition-base);
}

.filter-chip:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.filter-chip.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-glow);
}

/* ===================================================================
   17. PROJECTS CONTENT
   =================================================================== */

.projects-content {
  position: relative;
  padding-block: var(--space-16);
}

.category-section {
  margin-bottom: var(--space-20);
}

.category-section:last-child {
  margin-bottom: 0;
}

.category-title {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-8);
  padding-bottom: var(--space-4);
  border-bottom: 2px solid var(--color-border);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-6);
}

.project-compact-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all var(--transition-base);
  cursor: pointer;
}

.project-compact-card:hover {
  border-color: var(--color-edge-glow);
  box-shadow: var(--shadow-glow);
  transform: translateY(-4px);
}

.project-compact-card.hidden {
  display: none;
}

.project-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-3);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.project-role {
  font-weight: 600;
  color: var(--color-primary);
}

.project-compact-title {
  font-size: var(--text-lg);
  margin-bottom: var(--space-3);
  color: var(--color-text);
  line-height: 1.3;
}

.project-org {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

.project-summary {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  line-height: 1.6;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.project-tech {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-bottom: var(--space-4);
  font-family: var(--font-mono);
}

.project-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-primary);
}

/* ===================================================================
   18. MODAL SYSTEM
   =================================================================== */

.modal {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

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

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: var(--z-modal-backdrop);
}

.modal-panel {
  position: relative;
  z-index: var(--z-modal);
  width: 100%;
  max-width: 700px;
  max-height: 90vh;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  transform: scale(0.96);
  transition: transform var(--transition-base);
}

.modal.active .modal-panel {
  transform: scale(1);
}

.modal-panel--large {
  max-width: 900px;
}

.modal-close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  cursor: pointer;
  z-index: 10;
  transition: all var(--transition-base);
}

.modal-close:hover {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-color: var(--color-primary);
}

.modal-content {
  padding: var(--space-8);
  max-height: 90vh;
  overflow-y: hidden;
}

.modal-header {
  margin-bottom: var(--space-6);
}

.modal-title {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-3);
}

.modal-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

.modal-meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.modal-meta-item i {
  color: var(--color-primary);
}

.modal-description {
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: var(--space-6);
}

.modal-section {
  margin-bottom: var(--space-6);
}

.modal-section-title {
  font-size: var(--text-lg);
  margin-bottom: var(--space-3);
  color: var(--color-text);
}

.modal-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.modal-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 600;
  transition: all var(--transition-base);
}

.modal-link:hover {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

/* ===================================================================
   19. CERTIFICATES PAGE
   =================================================================== */

.featured-certs-section,
.all-certs-section,
.badges-section {
  padding-block: var(--space-16);
}

.featured-certs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-6);
}

.certs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-6);
}

.badges-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-6);
}

.cert-doc-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
  cursor: pointer;
}

.cert-doc-card:hover {
  border-color: var(--color-edge-glow);
  box-shadow: var(--shadow-glow);
  transform: translateY(-4px);
}

.cert-doc-preview {
  height: 180px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface-2);
  color: var(--color-primary);
  font-size: 4rem;
  position: relative;
  overflow: hidden;
}

.cert-doc-preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cert-doc-content {
  padding: var(--space-5);
}

.cert-doc-title {
  font-size: var(--text-base);
  margin-bottom: var(--space-2);
  line-height: 1.4;
  color: var(--color-text);
}

.cert-doc-issuer {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-1);
}

.cert-doc-date {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-bottom: var(--space-3);
}

.cert-doc-id {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-family: var(--font-mono);
  margin-bottom: var(--space-3);
}

.cert-doc-actions {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.cert-action-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
  font-weight: 600;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-primary);
  cursor: pointer;
  transition: all var(--transition-base);
}

.cert-action-btn:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-text-inverse);
}

.badge-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  text-align: center;
  transition: all var(--transition-base);
}

.badge-card:hover {
  border-color: var(--color-edge-glow);
  box-shadow: var(--shadow-glow);
  transform: translateY(-4px);
}

.badge-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--space-4);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-glow);
  /* border-radius: 50%; */
  color: var(--color-primary);
  font-size: 2rem;
  overflow: hidden;
}

.badge-icon img {
  width: 100%;
  height: 100%;
  /* object-fit: cover; */
  /* border-radius: 50%; */
}

.badge-title {
  font-size: var(--text-base);
  margin-bottom: var(--space-2);
  color: var(--color-text);
}

.badge-issuer {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-1);
}

.badge-date {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-bottom: var(--space-4);
}

.badge-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 600;
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.badge-link:hover {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-glow);
}

/* ===================================================================
   20. FOOTER
   =================================================================== */

.footer {
  padding-block: var(--space-12);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-6);
}

.footer-text p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.footer-social {
  display: flex;
  gap: var(--space-4);
}

.social-link {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: var(--text-lg);
  transition: all var(--transition-base);
}

.social-link:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-text-inverse);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

/* ===================================================================
   21. UTILITIES
   =================================================================== */

.text-center {
  text-align: center;
}

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

.text-primary {
  color: var(--color-primary);
}

.mt-4 {
  margin-top: var(--space-4);
}

.mb-4 {
  margin-bottom: var(--space-4);
}

.hidden {
  display: none !important;
}

.fade-in {
  opacity: 0;
  animation: fadeIn 0.6s var(--ease-standard) forwards;
}

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

.slide-up {
  opacity: 0;
  transform: translateY(30px);
  animation: slideUp 0.6s var(--ease-standard) forwards;
}

@keyframes slideUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===================================================================
   22. RESPONSIVE UTILITIES
   =================================================================== */

@media (max-width: 768px) {
  .hero {
    min-height: auto;
    padding-block: var(--space-20);
  }

  .hero-title {
    font-size: var(--text-3xl);
  }

  .portrait-container {
    width: 280px;
    height: 280px;
  }

  .portrait-frame {
    width: 240px;
    height: 240px;
  }

  .projects-rail-wrapper {
    margin-inline: 0;
  }

  .project-preview-card {
    width: 320px;
  }

  .timeline::before {
    left: 12px;
  }

  .timeline-item {
    padding-left: 48px;
  }

  .filters-section {
    position: relative;
    top: 0;
  }

  .filter-bar {
    justify-content: flex-start;
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: var(--space-2);
  }

  .filter-chip {
    flex-shrink: 0;
  }

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

  .modal-panel {
    max-width: 100%;
    max-height: 100vh;
    border-radius: 0;
  }

  .modal-content {
    padding: var(--space-6);
  }
}

@media (min-width: 1024px) {
  .container {
    padding-inline: var(--space-12);
  }
}

/* ===================================================================
   23. DARK MODE SPECIFIC ADJUSTMENTS
   =================================================================== */

[data-theme="dark"] .hero-grid {
  opacity: 0.2;
}

[data-theme="dark"] .navbar {
  background: rgba(15, 17, 23, 0.8);
}

[data-theme="dark"] .modal-backdrop {
  background: rgba(0, 0, 0, 0.85);
}

/* ===================================================================
   24. PRINT STYLES
   =================================================================== */

@media print {
  .navbar,
  .hero-background,
  .theme-toggle,
  .nav-toggle,
  .footer,
  .modal {
    display: none !important;
  }

  body {
    background: white;
    color: black;
  }

  .section {
    page-break-inside: avoid;
  }
}