/* ============================================
   PORTFOLIO MAIN STYLESHEET
   Modern, Professional Design System
   ============================================ */

/* ---------- CSS Variables / Design Tokens ---------- */
:root {
  /* Colors */
  --color-bg-primary: #0a0a0f;
  --color-bg-secondary: #12121a;
  --color-bg-tertiary: #1a1a25;
  --color-bg-card: rgba(20, 20, 30, 0.8);
  --color-bg-glass: rgba(255, 255, 255, 0.03);

  --color-text-primary: #f0f0f5;
  --color-text-secondary: #b8b8c5;
  --color-text-muted: #8888a0;

  --color-accent: #4ade80;
  --color-accent-hover: #22c55e;
  --color-accent-glow: rgba(74, 222, 128, 0.3);
  --color-accent-subtle: rgba(74, 222, 128, 0.1);

  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-hover: rgba(74, 222, 128, 0.4);

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

  /* Spacing */
  --sidebar-width: 280px;
  --section-gap: 100px;
  --content-max-width: 1200px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Effects */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px var(--color-accent-glow);

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-display);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-text-primary) 0%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  color: var(--color-text-primary);
  margin-bottom: 1rem;
}

h3 {
  font-size: clamp(1.2rem, 2.5vw, 1.5rem);
  color: var(--color-text-primary);
  margin-bottom: 0.75rem;
}

p {
  color: var(--color-text-secondary);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 1rem;
}

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

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

/* ---------- Sidebar Navigation ---------- */
.sidebar {
  position: fixed;
  left: 0;
  top: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: linear-gradient(180deg, var(--color-bg-secondary) 0%, var(--color-bg-primary) 100%);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  z-index: 1000;
  padding: 2rem 0;
}

.sidebar__logo {
  padding: 0 2rem 2rem;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 1rem;
}

.sidebar__logo-text {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.sidebar__logo-accent {
  color: var(--color-accent);
}

.sidebar__nav {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 1rem 0;
}

.sidebar__link {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 2rem;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition: all var(--transition-base);
  position: relative;
  border-left: 3px solid transparent;
}

.sidebar__link::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--color-accent-subtle), transparent);
  transition: width var(--transition-base);
}

.sidebar__link:hover,
.sidebar__link--active {
  color: var(--color-text-primary);
  border-left-color: var(--color-accent);
}

.sidebar__link:hover::before,
.sidebar__link--active::before {
  width: 100%;
}

.sidebar__link-icon {
  font-size: 1.2rem;
  width: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.sidebar__footer {
  padding: 1.5rem 2rem;
  border-top: 1px solid var(--color-border);
}

.sidebar__social {
  display: flex;
  gap: 1rem;
}

.sidebar__social-link {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--color-bg-glass);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  transition: all var(--transition-base);
}

.sidebar__social-link:hover {
  background: var(--color-accent-subtle);
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-2px);
}

/* ---------- Main Content Area ---------- */
.main-content {
  margin-left: var(--sidebar-width);
  min-height: 100vh;
  position: relative;
}

/* ---------- Hero Section ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: 4rem 3rem;
}

.hero__content {
  max-width: 800px;
  text-align: center;
  z-index: 10;
}

.hero__greeting {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--color-accent);
  margin-bottom: 1rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.hero__title {
  margin-bottom: 1.5rem;
}

.hero__subtitle {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  margin-bottom: 2rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  margin-bottom: 2.5rem;
}

.hero__tag {
  padding: 0.5rem 1rem;
  background: var(--color-bg-glass);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-text-muted);
  transition: all var(--transition-base);
}

.hero__tag:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-accent-subtle);
}

.hero__cta {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 1.75rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
}

.btn--primary {
  background: var(--color-accent);
  color: var(--color-bg-primary);
  border: none;
}

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

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

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

.hero__scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
  40% { transform: translateX(-50%) translateY(-10px); }
  60% { transform: translateX(-50%) translateY(-5px); }
}

/* ---------- Section Base Styles ---------- */
.section {
  padding: 6rem 3rem;
  position: relative;
}

.section__header {
  text-align: center;
  margin-bottom: 4rem;
}

.section__label {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-accent);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
  display: block;
}

.section__title {
  margin-bottom: 1rem;
}

.section__description {
  max-width: 600px;
  margin: 0 auto;
  color: var(--color-text-muted);
}

/* ---------- About Section ---------- */
.about {
  background: linear-gradient(180deg, transparent, var(--color-bg-secondary), transparent);
}

.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  max-width: var(--content-max-width);
  margin: 0 auto;
  align-items: center;
}

.about__image {
  position: relative;
}

.about__image-wrapper {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 4/5;
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
}

.about__image-wrapper::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--color-accent-subtle), transparent);
  z-index: 1;
}

.about__content h3 {
  font-size: 1.75rem;
  margin-bottom: 1.5rem;
}

.about__bio {
  margin-bottom: 2rem;
}

.about__details {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.about__detail {
  padding: 1.25rem;
  background: var(--color-bg-glass);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

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

.about__detail-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.25rem;
}

.about__detail-value {
  color: var(--color-text-primary);
  font-weight: 500;
}

/* ---------- Skills Section ---------- */
.skills__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  max-width: var(--content-max-width);
  margin: 0 auto;
}

.skill-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all var(--transition-base);
}

.skill-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.skill-card__icon {
  width: 48px;
  height: 48px;
  background: var(--color-accent-subtle);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
  color: var(--color-accent);
}

.skill-card__title {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

.skill-card__description {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
}

.skill-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-card__tag {
  padding: 0.25rem 0.75rem;
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* ---------- Timeline / Experience Section ---------- */
.timeline {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--color-accent), var(--color-border));
}

.timeline__item {
  position: relative;
  padding-left: 3rem;
  padding-bottom: 3rem;
}

.timeline__item:last-child {
  padding-bottom: 0;
}

.timeline__marker {
  position: absolute;
  left: -6px;
  top: 0;
  width: 14px;
  height: 14px;
  background: var(--color-accent);
  border-radius: 50%;
  border: 3px solid var(--color-bg-primary);
  box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.timeline__date {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.timeline__title {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.timeline__content {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
}

.timeline__list {
  list-style: none;
  padding: 0;
}

.timeline__list li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--color-text-secondary);
  font-size: 0.95rem;
}

.timeline__list li:last-child {
  margin-bottom: 0;
}

.timeline__list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.5rem;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
}

/* ---------- Projects Grid ---------- */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
  max-width: var(--content-max-width);
  margin: 0 auto;
}

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

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

.project-card__image {
  aspect-ratio: 16/10;
  background: var(--color-bg-tertiary);
  position: relative;
  overflow: hidden;
}

.project-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.project-card:hover .project-card__image img {
  transform: scale(1.05);
}

.project-card__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent, rgba(0,0,0,0.8));
  opacity: 0;
  transition: opacity var(--transition-base);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 1.5rem;
}

.project-card:hover .project-card__overlay {
  opacity: 1;
}

.project-card__content {
  padding: 1.5rem;
}

.project-card__category {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}

.project-card__title {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

.project-card__description {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.project-card__link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 500;
  font-size: 0.9rem;
}

.project-card__link::after {
  content: '\2192';
  transition: transform var(--transition-fast);
}

.project-card:hover .project-card__link::after {
  transform: translateX(4px);
}

/* ---------- Accordion (Achievements) ---------- */
.accordion-container {
  max-width: 800px;
  margin: 0 auto;
}

.accordion-item {
  margin-bottom: 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-base);
}

.accordion-item:hover {
  border-color: var(--color-border-hover);
}

.accordion-button {
  width: 100%;
  padding: 1.25rem 1.5rem;
  background: var(--color-bg-card);
  border: none;
  color: var(--color-text-primary);
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all var(--transition-base);
}

.accordion-button:hover {
  background: var(--color-bg-tertiary);
}

.accordion-button__icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: all var(--transition-base);
}

.accordion-item.active .accordion-button__icon {
  background: var(--color-accent);
  color: var(--color-bg-primary);
  transform: rotate(45deg);
}

.accordion-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base);
  background: var(--color-bg-secondary);
}

.accordion-panel__content {
  padding: 1.5rem;
}

.accordion-panel ul {
  list-style: none;
  padding: 0;
}

.accordion-panel li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--color-text-secondary);
}

.accordion-panel li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6rem;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
}

.accordion-panel ul ul {
  margin-top: 0.5rem;
  margin-left: 1rem;
}

.accordion-panel ul ul li::before {
  background: var(--color-text-muted);
  width: 4px;
  height: 4px;
}

/* ---------- 3D Canvas Background ---------- */
.canvas-container {
  position: fixed;
  top: 0;
  left: var(--sidebar-width);
  right: 0;
  bottom: 0;
  z-index: 0;
  pointer-events: none;
}

.canvas-container canvas {
  width: 100% !important;
  height: 100% !important;
}

/* Canvas overlay gradient */
.canvas-overlay {
  position: fixed;
  top: 0;
  left: var(--sidebar-width);
  right: 0;
  bottom: 0;
  z-index: 1;
  pointer-events: none;
  background:
    radial-gradient(ellipse at center, transparent 0%, var(--color-bg-primary) 70%),
    linear-gradient(180deg, transparent 0%, var(--color-bg-primary) 100%);
}

/* ---------- Footer ---------- */
.footer {
  padding: 3rem;
  text-align: center;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-secondary);
}

.footer__text {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.footer__text span {
  color: var(--color-accent);
}

/* ---------- Animations ---------- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.animate-fadeInUp {
  animation: fadeInUp 0.6s ease forwards;
}

.animate-fadeIn {
  animation: fadeIn 0.6s ease forwards;
}

.animate-delay-1 { animation-delay: 0.1s; }
.animate-delay-2 { animation-delay: 0.2s; }
.animate-delay-3 { animation-delay: 0.3s; }
.animate-delay-4 { animation-delay: 0.4s; }

/* ---------- Utility Classes ---------- */
.container {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

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

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

/* ---------- Responsive Design ---------- */
@media (max-width: 1024px) {
  :root {
    --sidebar-width: 240px;
  }

  .about__grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .about__image {
    order: -1;
  }
}

@media (max-width: 768px) {
  :root {
    --sidebar-width: 0px;
  }

  .sidebar {
    transform: translateX(-100%);
    width: 280px;
    transition: transform var(--transition-base);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .mobile-menu-toggle {
    display: flex;
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 1001;
    width: 44px;
    height: 44px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--color-text-primary);
  }

  .hero {
    padding: 2rem 1.5rem;
  }

  .section {
    padding: 4rem 1.5rem;
  }

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

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

  .hero__cta {
    flex-direction: column;
  }

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

/* Mobile menu toggle - hidden on desktop */
.mobile-menu-toggle {
  display: none;
}

/* ---------- Loading State ---------- */
.loading {
  position: fixed;
  inset: 0;
  background: var(--color-bg-primary);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
}

.loading__spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}