/* ═══════════════════════════════════════════
   DESIGN SYSTEM: Abyssal Mint (Stitch-Generated)
   Portfolio for Nishar Miya — Founding AI Engineer
   ═══════════════════════════════════════════ */

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

:root {
  /* Tonal Surface Hierarchy (Stitch Abyssal Mint) */
  --bg: #041329;
  --surface: #041329;
  --surface-dim: #041329;
  --surface-container-lowest: #010e24;
  --surface-container-low: #0d1c32;
  --surface-container: #112036;
  --surface-container-high: #1c2a41;
  --surface-container-highest: #27354c;
  --surface-bright: #2c3951;

  /* Primary Accent */
  --accent: #64ffda;
  --accent-dim: #38debb;
  --accent-glow: rgba(100, 255, 218, 0.07);
  --accent-border: rgba(100, 255, 218, 0.1);
  --accent-hover-bg: rgba(100, 255, 218, 0.05);

  /* Typography Colors */
  --text-primary: #ccd6f6;
  --text-secondary: #a8b2d1;
  --text-muted: #8892b0;
  --text-bright: #e6f1ff;

  /* Semantic */
  --outline: #85948e;
  --outline-variant: #3c4a45;
  --ghost-border: rgba(60, 74, 69, 0.15);

  /* Spacing Scale */
  --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;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'Fira Code', 'SF Mono', 'Fira Mono', monospace;

  /* Radii */
  --radius-sm: 0.125rem;
  --radius-default: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text-muted);
  line-height: 1.6;
  font-size: 16px;
  overflow-x: hidden;
  position: relative;
}

/* ─── Spotlight Cursor Effect ─── */
.spotlight {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 1;
  background: radial-gradient(
    600px circle at var(--mouse-x, 50%) var(--mouse-y, 50%),
    var(--accent-glow),
    transparent 80%
  );
  transition: opacity 0.3s;
}

/* ─── Main Layout: Split Panel ─── */
.layout {
  display: flex;
  max-width: 1280px;
  margin: 0 auto;
  min-height: 100vh;
  position: relative;
  z-index: 2;
}

/* ─── Left Sidebar (Sticky) ─── */
.sidebar {
  position: sticky;
  top: 0;
  width: 42%;
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: var(--space-24) var(--space-12) var(--space-24) var(--space-12);
}

.sidebar-header {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.sidebar-name {
  font-size: 3rem;
  font-weight: 700;
  color: var(--text-bright);
  letter-spacing: -0.025em;
  line-height: 1.1;
}

.sidebar-title {
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-top: var(--space-2);
}

.sidebar-tagline {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-top: var(--space-4);
  max-width: 320px;
}

/* ─── Navigation ─── */
.nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  margin-top: var(--space-16);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: var(--space-3) 0;
  transition: color var(--transition-fast);
  position: relative;
}

.nav-line {
  display: inline-block;
  width: 32px;
  height: 1px;
  background: var(--text-muted);
  transition: all var(--transition-base);
}

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

.nav-link:hover .nav-line,
.nav-link.active .nav-line {
  width: 64px;
  background: var(--text-bright);
}

.nav-link.active {
  color: var(--accent);
}

.nav-link.active .nav-line {
  background: var(--accent);
}

/* ─── Sidebar Footer / Socials ─── */
.sidebar-footer {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.social-links {
  display: flex;
  gap: var(--space-6);
  align-items: center;
}

.social-link {
  color: var(--text-muted);
  transition: color var(--transition-fast), transform var(--transition-fast);
  display: flex;
}

.social-link:hover {
  color: var(--accent);
  transform: translateY(-2px);
}

.social-link svg {
  width: 22px;
  height: 22px;
  stroke-width: 1.5;
}

.resume-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border: 1px solid var(--accent);
  border-radius: var(--radius-default);
  color: var(--accent);
  text-decoration: none;
  font-size: 0.8125rem;
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
  transition: all var(--transition-fast);
  width: fit-content;
}

.resume-btn:hover {
  background: var(--accent-hover-bg);
  box-shadow: 0 0 12px rgba(100, 255, 218, 0.1);
}

/* ─── Right Content Panel ─── */
.content {
  width: 58%;
  padding: var(--space-24) var(--space-12) var(--space-24) var(--space-8);
}

/* ─── Sections ─── */
.section {
  padding-top: var(--space-24);
  margin-bottom: var(--space-8);
}

.section:first-child {
  padding-top: var(--space-24);
}

.section-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
}

.section-number {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--accent);
  font-weight: 400;
}

.section-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

/* ─── About Section ─── */
.about-text p {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.75;
  margin-bottom: var(--space-4);
}

.about-text a,
.inline-link {
  color: var(--accent);
  text-decoration: none;
  transition: opacity var(--transition-fast);
}

.inline-link:hover {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.about-text strong {
  color: var(--text-primary);
  font-weight: 500;
}

/* ─── Experience Cards ─── */
.experience-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.experience-card {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: var(--space-4);
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  text-decoration: none;
  color: inherit;
  position: relative;
}

.experience-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  border: 1px solid transparent;
  transition: border-color var(--transition-base);
}

.experience-card:hover {
  background: var(--accent-hover-bg);
}

.experience-card:hover::before {
  border-color: var(--accent-border);
}

.experience-date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  padding-top: var(--space-1);
  text-transform: uppercase;
  line-height: 1.6;
}

.experience-content h3 {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  transition: color var(--transition-fast);
}

.experience-card:hover .experience-content h3 {
  color: var(--accent);
}

.experience-arrow {
  display: inline-block;
  font-size: 0.875rem;
  transition: transform var(--transition-fast);
}

.experience-card:hover .experience-arrow {
  transform: translate(4px, -4px);
}

.experience-content p {
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--text-muted);
  margin-bottom: var(--space-3);
}

/* ─── Tech Tags ─── */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-2);
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--accent);
  background: rgba(100, 255, 218, 0.08);
  padding: var(--space-1) var(--space-3);
  border-radius: 9999px;
  letter-spacing: 0.02em;
}

/* ─── Project Cards ─── */
.project-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.project-card {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  text-decoration: none;
  color: inherit;
  position: relative;
}

.project-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  border: 1px solid transparent;
  transition: border-color var(--transition-base);
}

.project-card:hover {
  background: var(--accent-hover-bg);
}

.project-card:hover::before {
  border-color: var(--accent-border);
}

.project-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-1);
}

.project-title {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  transition: color var(--transition-fast);
}

.project-card:hover .project-title {
  color: var(--accent);
}

.project-badge {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  padding: var(--space-1) var(--space-3);
  border-radius: 9999px;
  letter-spacing: 0.04em;
}

.badge-production {
  color: var(--accent);
  background: rgba(100, 255, 218, 0.08);
  border: 1px solid var(--accent-border);
}

.badge-winner {
  color: #fbbf24;
  background: rgba(251, 191, 36, 0.08);
  border: 1px solid rgba(251, 191, 36, 0.15);
}

.project-subtitle {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}

.project-description {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-3);
}

/* ─── Research Cards ─── */
.research-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.research-card {
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  position: relative;
}

.research-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  border: 1px solid transparent;
  transition: border-color var(--transition-base);
}

.research-card:hover {
  background: var(--accent-hover-bg);
}

.research-card:hover::before {
  border-color: var(--accent-border);
}

.research-venue {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--space-2);
}

.research-title {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
  line-height: 1.5;
}

.research-description {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-3);
}

.research-link {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--accent);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  transition: gap var(--transition-fast);
}

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

/* ─── Tech Stack Grid ─── */
.stack-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
}

.stack-category h3 {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--space-3);
}

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

/* ─── Achievements Grid ─── */
.achievements-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.achievement-card {
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  background: var(--surface-container);
  transition: all var(--transition-base);
  position: relative;
}

.achievement-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  border: 1px solid var(--ghost-border);
  transition: border-color var(--transition-base);
}

.achievement-card:hover {
  background: var(--surface-container-high);
  transform: translateY(-2px);
}

.achievement-card:hover::before {
  border-color: var(--accent-border);
}

.achievement-emoji {
  font-size: 1.5rem;
  margin-bottom: var(--space-2);
}

.achievement-name {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: var(--space-1);
}

.achievement-detail {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ─── Contact Section ─── */
.contact-content {
  text-align: left;
}

.contact-heading {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-4);
  letter-spacing: -0.025em;
}

.contact-text {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: var(--space-8);
  max-width: 480px;
}

.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.contact-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border: 1px solid var(--accent);
  border-radius: var(--radius-default);
  color: var(--accent);
  text-decoration: none;
  font-size: 0.8125rem;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  transition: all var(--transition-fast);
}

.contact-btn:hover {
  background: var(--accent-hover-bg);
  box-shadow: 0 0 12px rgba(100, 255, 218, 0.1);
}

.contact-btn-primary {
  background: var(--accent);
  color: var(--bg);
  font-weight: 600;
}

.contact-btn-primary:hover {
  background: var(--accent-dim);
  box-shadow: 0 0 20px rgba(100, 255, 218, 0.15);
}

/* ─── Footer ─── */
.footer {
  padding: var(--space-16) 0 var(--space-8);
  text-align: left;
}

.footer-text {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  line-height: 1.8;
}

.footer-text a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-text a:hover {
  color: var(--accent);
}

/* ─── Selection ─── */
::selection {
  background: rgba(100, 255, 218, 0.15);
  color: var(--text-bright);
}

/* ─── Scrollbar ─── */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg);
}

::-webkit-scrollbar-thumb {
  background: var(--surface-container-high);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--surface-bright);
}

/* ─── Mobile Navigation (Hidden by default) ─── */
.mobile-nav {
  display: none;
}

/* ═══════════════════════════════════════════
   RESPONSIVE DESIGN
   ═══════════════════════════════════════════ */

@media (max-width: 1024px) {
  .layout {
    flex-direction: column;
  }

  .sidebar {
    position: relative;
    width: 100%;
    height: auto;
    padding: var(--space-12) var(--space-6) var(--space-8);
  }

  .nav {
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-top: var(--space-8);
  }

  .nav-line {
    display: none;
  }

  .nav-link {
    font-size: 0.75rem;
    padding: var(--space-2) var(--space-3);
    border-radius: 9999px;
    border: 1px solid var(--ghost-border);
  }

  .nav-link.active {
    border-color: var(--accent-border);
    background: var(--accent-hover-bg);
  }

  .sidebar-footer {
    flex-direction: row;
    align-items: center;
    gap: var(--space-8);
    margin-top: var(--space-6);
  }

  .content {
    width: 100%;
    padding: 0 var(--space-6) var(--space-12);
  }

  .section:first-child {
    padding-top: var(--space-8);
  }

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

  .experience-date {
    margin-bottom: var(--space-1);
  }

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

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

@media (max-width: 640px) {
  .sidebar-name {
    font-size: 2.25rem;
  }

  .sidebar-title {
    font-size: 1.125rem;
  }

  .content {
    padding: 0 var(--space-4) var(--space-8);
  }

  .section {
    padding-top: var(--space-16);
  }

  .contact-heading {
    font-size: 2rem;
  }

  .contact-actions {
    flex-direction: column;
  }

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

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

  /* Mobile bottom nav */
  .mobile-nav {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(4, 19, 41, 0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-top: 1px solid var(--ghost-border);
    padding: var(--space-2) var(--space-4);
    z-index: 100;
    justify-content: space-around;
  }

  .mobile-nav a {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.625rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--space-2);
    transition: color var(--transition-fast);
  }

  .mobile-nav a.active,
  .mobile-nav a:hover {
    color: var(--accent);
  }

  .mobile-nav svg {
    width: 20px;
    height: 20px;
    stroke-width: 1.5;
  }
}

/* ─── Reduced Motion ─── */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .spotlight {
    display: none;
  }
}