/* ==========================================================================
   PRASHANT THORAT - DEVELOPER PORTFOLIO
   Design System & Styling
   ========================================================================== */

/* --- Google Fonts Import --- */
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600&family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

/* --- CSS Variables & Theme Tokens --- */
:root {
  /* Typography */
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Theme: Dark (Default) */
  --bg-primary: #0d1117;
  --bg-secondary: #141d26;
  --bg-tertiary: #1c2a34;
  --bg-card: rgba(20, 29, 38, 0.82);
  --bg-card-hover: rgba(28, 38, 48, 0.94);
  --bg-glass: rgba(13, 17, 23, 0.82);

  --text-primary: #edf3f7;
  --text-secondary: #b4c0cd;
  --text-muted: #8998a8;
  --text-accent: #d9b18a;

  --border-subtle: rgba(180, 192, 205, 0.11);
  --border-medium: rgba(180, 192, 205, 0.16);
  --border-focus: rgba(217, 177, 138, 0.42);

  --accent-primary: #c89b6b;       /* Warm Bronze */
  --accent-primary-hover: #b7885d;
  --accent-secondary: #97aeb9;     /* Soft Steel */
  --accent-emerald: #7cc2ba;       /* Muted Teal */
  --accent-amber: #d79d59;         /* Soft Gold */
  --accent-rose: #de7b7b;          /* Dusty Rose */

  --glow-primary: rgba(200, 155, 107, 0.14);
  --glow-accent: rgba(151, 174, 185, 0.08);
  --shadow-card: 0 18px 35px -20px rgba(2, 6, 15, 0.8);
  --shadow-hover: 0 22px 42px -20px rgba(200, 155, 107, 0.18);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 350ms cubic-bezier(0.16, 1, 0.3, 1);

  --nav-height: 72px;
  --container-max: 1200px;
}

/* Light Theme */
[data-theme="light"] {
  --bg-primary: #f4f7f6;
  --bg-secondary: #ffffff;
  --bg-tertiary: #edf3f1;
  --bg-card: rgba(255, 255, 255, 0.9);
  --bg-card-hover: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.8);

  --text-primary: #17212c;
  --text-secondary: #4f5d6d;
  --text-muted: #728197;
  --text-accent: #1f5f6a;

  --border-subtle: rgba(23, 33, 44, 0.08);
  --border-medium: rgba(23, 33, 44, 0.14);
  --border-focus: rgba(31, 95, 106, 0.45);

  --glow-primary: rgba(31, 95, 106, 0.08);
  --glow-accent: rgba(142, 201, 195, 0.08);
  --shadow-card: 0 12px 28px -18px rgba(15, 23, 42, 0.12);
  --shadow-hover: 0 22px 40px -20px rgba(31, 95, 106, 0.12);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 20px);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Subtle background ambient mesh */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 1400px;
  height: 600px;
  background: radial-gradient(circle at 50% 0%, var(--glow-primary) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* Typography Defaults */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

p {
  color: var(--text-secondary);
}

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

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

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

/* --- Container & Utilities --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
  position: relative;
  z-index: 1;
}

.section {
  padding: 96px 0;
  position: relative;
}

.section-header {
  margin-bottom: 56px;
  max-width: 680px;
}

.section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.825rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-primary);
  margin-bottom: 12px;
}

.section-eyebrow::before {
  content: '//';
  opacity: 0.6;
}

.section-title {
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.section-title .text-gradient {
  background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-description {
  font-size: 1.075rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* --- Scroll Progress Bar --- */
.scroll-progress-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: transparent;
  z-index: 1100;
}

.scroll-progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  transition: width 100ms ease-out;
}

/* --- Navigation Bar --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  background: var(--bg-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 1000;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.brand-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  background: rgba(29, 117, 128, 0.12);
  color: var(--accent-primary);
  border: 1px solid rgba(29, 117, 128, 0.25);
}

.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 28px;
}

.nav-link {
  font-size: 0.925rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 0;
  transition: color var(--transition-fast);
}

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

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--accent-primary);
  border-radius: 2px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  transition: color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.theme-toggle-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-medium);
  transform: translateY(-1px);
}

.theme-toggle-btn svg {
  width: 18px;
  height: 18px;
  stroke-width: 2;
}

.sun-icon { display: none; }
.moon-icon { display: block; }
[data-theme="light"] .sun-icon { display: block; }
[data-theme="light"] .moon-icon { display: none; }

/* Mobile Menu Toggle */
.mobile-toggle-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  color: var(--text-primary);
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
}

/* --- Hero Section --- */
.hero-section {
  padding-top: calc(var(--nav-height) + 64px);
  padding-bottom: 96px;
  min-height: calc(100vh - var(--nav-height));
  display: flex;
  align-items: center;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.85fr;
  gap: 60px;
  align-items: center;
}

.hero-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 14px;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent-emerald);
  margin-bottom: 24px;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-emerald);
  box-shadow: 0 0 10px var(--accent-emerald);
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0% { transform: scale(0.95); opacity: 0.7; }
  50% { transform: scale(1.2); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.7; }
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4.25rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 16px;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  font-weight: 600;
  color: var(--text-accent);
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}

.hero-bio {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 32px;
  max-width: 600px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-bottom: 36px;
}

.hero-social-bar {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-top: 20px;
  border-top: 1px solid var(--border-subtle);
}

.social-label {
  font-size: 0.85rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

.social-links {
  display: flex;
  align-items: center;
  gap: 10px;
}

.social-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.social-btn:hover {
  color: var(--accent-primary);
  border-color: var(--border-focus);
  transform: translateY(-2px);
  background: var(--bg-tertiary);
}

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

/* Hero Avatar Card */
.hero-visual-card {
  position: relative;
  display: flex;
  justify-content: center;
}

.avatar-wrapper {
  position: relative;
  width: 240px;
  height: 290px;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-smooth);
}

.avatar-wrapper:hover {
  transform: translateY(-4px);
  border-color: var(--border-focus);
}

.avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
}

.avatar-backdrop-glow {
  position: absolute;
  inset: -15px;
  background: linear-gradient(135deg, var(--glow-primary), var(--glow-accent));
  border-radius: var(--radius-xl);
  filter: blur(20px);
  z-index: -1;
  opacity: 0.7;
}

/* Floating Tech Chips around avatar */
.floating-chip {
  position: absolute;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: 0.775rem;
  font-weight: 600;
  color: var(--text-primary);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
  display: flex;
  align-items: center;
  gap: 8px;
  z-index: 2;
  animation: float 4s ease-in-out infinite alternate;
}

.chip-top {
  top: 15px;
  right: -20px;
}

.chip-bottom {
  bottom: 25px;
  left: -25px;
  animation-delay: -2s;
}

@keyframes float {
  0% { transform: translateY(0px); }
  100% { transform: translateY(-8px); }
}

/* --- Buttons System --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.925rem;
  font-weight: 600;
  padding: 11px 22px;
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent-primary);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(29, 117, 128, 0.32);
}

.btn-primary:hover {
  background: var(--accent-primary-hover);
  box-shadow: 0 6px 20px rgba(29, 117, 128, 0.45);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
}

.btn-secondary:hover {
  background: var(--bg-tertiary);
  border-color: var(--border-focus);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
}

.btn-outline:hover {
  border-color: var(--border-focus);
  color: var(--accent-primary);
  background: rgba(29, 117, 128, 0.05);
}

.btn-sm {
  padding: 7px 14px;
  font-size: 0.825rem;
  border-radius: var(--radius-sm);
}

.btn-disabled {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
  background: var(--bg-tertiary) !important;
  color: var(--text-muted) !important;
  border-color: var(--border-subtle) !important;
}

/* --- About Section --- */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 48px;
  align-items: start;
}

.about-text {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.about-text p {
  font-size: 1.05rem;
  line-height: 1.75;
}

.about-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 22px;
  transition: all var(--transition-fast);
}

.stat-card:hover {
  border-color: var(--border-focus);
  transform: translateY(-2px);
  background: var(--bg-card-hover);
}

.stat-label {
  font-family: var(--font-mono);
  font-size: 0.775rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.stat-value {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.stat-note {
  font-size: 0.825rem;
  color: var(--text-secondary);
}

/* --- Skills Section --- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.skill-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
  backdrop-filter: blur(8px);
}

.skill-card:hover {
  border-color: var(--border-focus);
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  background: var(--bg-card-hover);
}

.skill-card-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 12px;
}

.skill-card-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: rgba(29, 117, 128, 0.1);
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(29, 117, 128, 0.2);
}

.skill-card-icon svg {
  width: 22px;
  height: 22px;
}

.skill-card-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
}

.skill-card-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.skill-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: auto;
}

.skill-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.skill-badge.highlight {
  border-color: rgba(29, 117, 128, 0.35);
  background: rgba(29, 117, 128, 0.08);
  color: var(--accent-primary);
  font-weight: 600;
}

.skill-badge:hover {
  border-color: var(--accent-primary);
  transform: translateY(-1px);
}

/* --- Projects Section --- */
.projects-filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 36px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-subtle);
}

.filter-btn {
  padding: 8px 18px;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-medium);
}

.filter-btn.active {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: var(--accent-primary);
  box-shadow: 0 2px 10px rgba(29, 117, 128, 0.3);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 28px;
}

/* Project Card */
.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-normal);
  backdrop-filter: blur(8px);
}

.project-card:hover {
  border-color: var(--border-focus);
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  background: var(--bg-card-hover);
}

/* Special Highlighting for WildTrack AI */
.project-card.featured-patent {
  border-color: rgba(245, 158, 11, 0.4);
  background: linear-gradient(180deg, rgba(245, 158, 11, 0.04) 0%, var(--bg-card) 40%);
}

.project-card.featured-patent:hover {
  border-color: rgba(245, 158, 11, 0.7);
  box-shadow: 0 20px 40px -15px rgba(245, 158, 11, 0.15);
}

/* Special Highlighting for Ongoing Product */
.project-card.ongoing-product {
  border-color: rgba(6, 182, 212, 0.35);
  background: linear-gradient(180deg, rgba(6, 182, 212, 0.03) 0%, var(--bg-card) 40%);
}

.project-card.ongoing-product:hover {
  border-color: rgba(6, 182, 212, 0.65);
}

.project-badges-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
}

.badge-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.badge-patent {
  background: rgba(245, 158, 11, 0.12);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.35);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.badge-active {
  background: rgba(6, 182, 212, 0.12);
  color: var(--accent-secondary);
  border: 1px solid rgba(6, 182, 212, 0.3);
}

.project-title {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.project-subtitle {
  font-size: 0.9rem;
  color: var(--accent-primary);
  font-weight: 600;
  margin-bottom: 14px;
}

.project-disclaimer {
  font-size: 0.8rem;
  font-style: italic;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.03);
  padding: 8px 12px;
  border-left: 3px solid var(--accent-primary);
  border-radius: var(--radius-sm);
  margin-bottom: 14px;
}

.project-description {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 18px;
}

.project-features-list {
  list-style: none;
  margin-bottom: 22px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.project-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.project-feature-item svg {
  width: 16px;
  height: 16px;
  color: var(--accent-emerald);
  flex-shrink: 0;
  margin-top: 3px;
}

.project-tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
  margin-bottom: 22px;
  padding-top: 14px;
  border-top: 1px solid var(--border-subtle);
}

.tech-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  color: var(--text-muted);
}

.project-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* --- Learning Journey Section --- */
.journey-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 20px;
}

.journey-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-fast);
}

.journey-card:hover {
  border-color: var(--border-focus);
  transform: translateY(-2px);
  background: var(--bg-card-hover);
}

.journey-focus-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-primary);
  margin-bottom: 8px;
}

.journey-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.journey-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}

.journey-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
}

/* --- Education Section --- */
.education-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 36px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 32px;
  align-items: center;
  backdrop-filter: blur(8px);
}

.edu-institution {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.edu-degree {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--accent-primary);
  margin-bottom: 6px;
}

.edu-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 18px;
}

.edu-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.edu-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.edu-coursework-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-family: var(--font-mono);
}

.edu-coursework-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.edu-badge-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px 32px;
  border-radius: var(--radius-lg);
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  text-align: center;
  min-width: 180px;
}

.edu-badge-icon {
  width: 48px;
  height: 48px;
  color: var(--accent-primary);
  margin-bottom: 10px;
}

.edu-badge-text {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-primary);
}

.edu-badge-sub {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* --- Achievements / Highlights Section --- */
.highlights-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
}

.highlight-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
  transition: all var(--transition-fast);
}

.highlight-card:hover {
  border-color: var(--border-focus);
  transform: translateY(-2px);
  background: var(--bg-card-hover);
}

.highlight-icon-box {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  background: rgba(29, 117, 128, 0.1);
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  border: 1px solid rgba(29, 117, 128, 0.2);
}

.highlight-icon-box svg {
  width: 20px;
  height: 20px;
}

.highlight-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.highlight-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* --- Hobbies / Beyond Coding --- */
.hobbies-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}

.hobby-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: all var(--transition-fast);
}

.hobby-card:hover {
  border-color: var(--border-focus);
  transform: translateY(-2px);
}

.hobby-emoji {
  font-size: 2rem;
  line-height: 1;
}

.hobby-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.hobby-desc {
  font-size: 0.825rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* --- Contact Section --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 48px;
  align-items: start;
}

.contact-info-panel {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-lead-text {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.contact-cards {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.contact-item-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  transition: all var(--transition-fast);
}

.contact-item-card:hover {
  border-color: var(--border-focus);
  background: var(--bg-card-hover);
}

.contact-item-left {
  display: flex;
  align-items: center;
  gap: 14px;
}

.contact-icon-box {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: rgba(29, 117, 128, 0.1);
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

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

.contact-item-label {
  font-size: 0.775rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  text-transform: uppercase;
}

.contact-item-val {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}

.copy-btn {
  padding: 6px 12px;
  font-size: 0.775rem;
  font-family: var(--font-mono);
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.copy-btn:hover {
  color: var(--accent-primary);
  border-color: var(--accent-primary);
}

/* Contact Form */
.contact-form-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 32px;
  backdrop-filter: blur(8px);
}

.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(29, 117, 128, 0.15);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--border-subtle);
  padding: 64px 0 36px 0;
  background: var(--bg-secondary);
}

.footer-top {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 32px;
  margin-bottom: 40px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border-subtle);
}

.footer-brand-title {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 4px;
}

.footer-brand-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  list-style: none;
}

.footer-link {
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--accent-primary);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* --- Project Detail & Patent Modal --- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-container {
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xl);
  max-width: 680px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  padding: 32px;
  position: relative;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.7);
  transform: scale(0.95);
  transition: transform var(--transition-normal);
}

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

.modal-close-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.modal-close-btn:hover {
  color: var(--text-primary);
  background: rgba(244, 63, 94, 0.2);
}

.modal-header {
  margin-bottom: 20px;
  padding-right: 40px;
}

.modal-title {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 6px;
}

.modal-body {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.modal-callout {
  padding: 16px;
  border-radius: var(--radius-md);
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.3);
  color: #fbbf24;
  font-size: 0.9rem;
  line-height: 1.6;
}

/* --- Toast Notification --- */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 3000;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}

.toast {
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  box-shadow: var(--shadow-card);
  padding: 12px 20px;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 10px;
  transform: translateY(20px);
  opacity: 0;
  transition: all var(--transition-normal);
  pointer-events: auto;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

.toast-success {
  border-left: 4px solid var(--accent-emerald);
}

.toast-info {
  border-left: 4px solid var(--accent-primary);
}

/* --- Responsive Adjustments --- */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 48px;
  }

  .hero-bio {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-cta-group {
    justify-content: center;
  }

  .hero-social-bar {
    justify-content: center;
  }

  .hero-visual-card {
    order: -1;
  }

  .avatar-wrapper {
    width: 260px;
    height: 310px;
  }

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

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

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

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    width: 100%;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-subtle);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    transform: translateY(-150%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
  }

  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .mobile-toggle-btn {
    display: flex;
  }

  .section {
    padding: 64px 0;
  }

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

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

  .floating-chip {
    display: none;
  }
}