/* =============================================================
   components.css — Nav, Hero, Cards, Badges, Modal, Skills, Contact
   ============================================================= */

/* ── Navigation ─────────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  z-index: 100;
  background: rgba(15, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: border-color var(--transition);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.nav__logo {
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

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

.nav__links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav__links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
  position: relative;
}

.nav__links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width var(--transition);
}

.nav__links a:hover,
.nav__links a.active {
  color: var(--text-primary);
}

.nav__links a:hover::after,
.nav__links a.active::after {
  width: 100%;
}

/* Hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}

.nav__hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-secondary);
  transition: all var(--transition);
  border-radius: 2px;
}

.nav__hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__hamburger.open span:nth-child(2) { opacity: 0; }
.nav__hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 640px) {
  .nav__links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--bg-card);
    flex-direction: column;
    gap: 0;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border);
    transform: translateY(-110%);
    transition: transform var(--transition);
  }
  .nav__links.open { transform: translateY(0); }
  .nav__links a { padding: 0.75rem 2rem; width: 100%; }
  .nav__hamburger { display: flex; }
}

/* ── Hero ───────────────────────────────────────────────────── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: calc(var(--nav-height) + 2rem);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -20%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.hero__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-light);
  padding: 0.35rem 0.85rem;
  border: 1px solid var(--border-accent);
  border-radius: 20px;
  background: var(--accent-dim);
  margin-bottom: 1.75rem;
}

.hero__title {
  font-size: clamp(2.25rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
}

.hero__title .highlight {
  color: var(--accent);
  position: relative;
}

.hero__desc {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 52ch;
  line-height: 1.7;
  margin-bottom: 2.5rem;
}

.hero__actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero__scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  font-size: 0.75rem;
  animation: bounce 2s ease-in-out infinite;
}

.hero__scroll::after {
  content: '';
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--text-muted), transparent);
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(6px); }
}

/* ── About ──────────────────────────────────────────────────── */
#about { background: var(--bg-card); }

.about__grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 4rem;
  align-items: start;
}

.about__avatar-wrap {
  position: relative;
}

.about__avatar {
  width: 100%;
  max-width: 240px;
  aspect-ratio: 1;
  border-radius: 16px;
  object-fit: cover;
  border: 2px solid var(--border-accent);
}

.about__avatar-placeholder {
  width: 100%;
  max-width: 240px;
  aspect-ratio: 1;
  border-radius: 16px;
  background: var(--bg-surface);
  border: 2px solid var(--border-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  color: var(--text-muted);
}

.about__text p + p { margin-top: 1rem; }

.about__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 2rem;
}

.stat {
  text-align: center;
  padding: 1rem;
  background: var(--bg-surface);
  border-radius: 10px;
  border: 1px solid var(--border);
}

.stat__num {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--accent-light);
  display: block;
}

.stat__label {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

@media (max-width: 768px) {
  .about__grid { grid-template-columns: 1fr; gap: 2rem; }
  .about__avatar, .about__avatar-placeholder { max-width: 160px; }
  .about__stats { grid-template-columns: repeat(3, 1fr); }
}

/* ── Skills ─────────────────────────────────────────────────── */
.skills__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

.skill-group {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--card-radius);
  padding: 1.5rem;
  transition: border-color var(--transition), transform var(--transition);
}

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

.skill-group__title {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-light);
  margin-bottom: 1rem;
}

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

.skill-pill {
  font-size: 0.8rem;
  padding: 0.3rem 0.7rem;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text-secondary);
}

/* ── Project Cards ──────────────────────────────────────────── */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.5rem;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--card-radius);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.project-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-3px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
}

.project-card:hover::before { transform: scaleX(1); }

.card__header {}

.card__title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
}

.card__subtitle {
  font-size: 0.78rem;
  color: var(--accent-light);
  font-weight: 500;
  letter-spacing: 0.01em;
}

.card__desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.card__tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.badge {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  letter-spacing: 0.01em;
}

.badge--llm      { background: rgba(99, 102, 241, 0.15);  color: #a5b4fc; }
.badge--backend  { background: rgba(34, 197, 94, 0.12);   color: #86efac; }
.badge--frontend { background: rgba(6, 182, 212, 0.12);   color: #67e8f9; }
.badge--cloud    { background: rgba(59, 130, 246, 0.12);  color: #93c5fd; }
.badge--data     { background: rgba(245, 158, 11, 0.12);  color: #fcd34d; }
.badge--mlops    { background: rgba(244, 63, 94, 0.12);   color: #fda4af; }

.card__highlights {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.card__highlights li {
  font-size: 0.82rem;
  color: var(--text-secondary);
  padding-left: 1.1rem;
  position: relative;
  line-height: 1.5;
}

.card__highlights li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 0.75rem;
}

.card__impact {
  background: rgba(245, 158, 11, 0.07);
  border: 1px solid rgba(245, 158, 11, 0.2);
  border-radius: 8px;
  padding: 0.7rem 0.9rem;
}

.card__impact-label {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #fbbf24;
  display: block;
  margin-bottom: 0.3rem;
}

.card__impact-text {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

.card__actions {
  margin-top: auto;
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

@media (max-width: 640px) {
  .projects__grid { grid-template-columns: 1fr; }
}

/* ── Contact ────────────────────────────────────────────────── */
#contact { background: var(--bg-card); }

.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.contact__links {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: all var(--transition);
}

.contact-link:hover {
  border-color: var(--border-accent);
  color: var(--text-primary);
  background: var(--bg-card-hover);
}

.contact-link__icon {
  width: 36px;
  height: 36px;
  background: var(--accent-dim);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.contact-link__text {
  display: flex;
  flex-direction: column;
}

.contact-link__label {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.contact-link__value {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

@media (max-width: 768px) {
  .contact__grid { grid-template-columns: 1fr; gap: 2rem; }
}

/* ── Modal ──────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(6px);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.modal {
  background: var(--bg-card);
  border: 1px solid var(--border-accent);
  border-radius: 16px;
  width: 100%;
  max-width: 860px;
  max-height: 88vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: translateY(20px) scale(0.97);
  transition: transform var(--transition);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5);
}

.modal-overlay.open .modal {
  transform: translateY(0) scale(1);
}

.modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

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

.modal__subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.modal__close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.4rem;
  cursor: pointer;
  padding: 0.25rem;
  border-radius: 6px;
  line-height: 1;
  transition: color var(--transition), background var(--transition);
}

.modal__close:hover {
  color: var(--text-primary);
  background: var(--bg-surface);
}

.modal__tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
  padding: 0 1.5rem;
  overflow-x: auto;
  flex-shrink: 0;
}

.modal__tab {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 0.7rem 1rem;
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color var(--transition), border-color var(--transition);
}

.modal__tab.active,
.modal__tab:hover {
  color: var(--accent-light);
  border-bottom-color: var(--accent);
}

.modal__body {
  flex: 1;
  overflow-y: auto;
  position: relative;
}

.modal__loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4rem;
  color: var(--text-muted);
  font-size: 0.875rem;
  gap: 0.75rem;
}

.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

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

.modal__code {
  margin: 0;
  padding: 0;
  height: 100%;
}

.modal__code code {
  font-size: 0.82rem !important;
  line-height: 1.7 !important;
  background: var(--bg-code) !important;
  display: block;
  padding: 1.5rem !important;
  border-radius: 0 !important;
  height: 100%;
  tab-size: 4;
}

/* ── Footer ─────────────────────────────────────────────────── */
.footer {
  padding: 2rem 1.5rem;
  text-align: center;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* ── Active nav indicator via IntersectionObserver ─────────── */
.nav__links a[data-section].active { color: var(--text-primary); }

/* ── Project Detail Modal ───────────────────────────────────── */
.modal--detail { max-width: 680px; }

.detail__section {
  padding: 1.5rem 1.75rem;
  border-bottom: 1px solid var(--border);
}
.detail__section:last-child { border-bottom: none; }

.detail__section-label {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent-light);
  margin-bottom: 0.75rem;
  display: block;
}

.detail__overview {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

.detail__arch-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.detail__arch-item {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 0.75rem;
  align-items: baseline;
}

.detail__arch-name {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.82rem;
}

.detail__arch-desc {
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

.detail__benefits-list {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.detail__benefit {
  font-size: 0.84rem;
  color: var(--text-secondary);
  padding-left: 1.25rem;
  position: relative;
  line-height: 1.5;
}

.detail__benefit::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: #4ade80;
  font-size: 0.75rem;
  font-weight: 700;
}

/* ── "Know More" button ─────────────────────────────────────── */
.btn-detail {
  background: transparent;
  color: var(--accent-light);
  border: 1px solid var(--border-accent);
  font-size: 0.8rem;
  padding: 0.45rem 0.9rem;
  border-radius: 6px;
  cursor: pointer;
  font-family: inherit;
  transition: background var(--transition), color var(--transition);
}

.btn-detail:hover {
  background: var(--accent-dim);
  color: var(--text-primary);
}

@media (max-width: 640px) {
  .detail__arch-item { grid-template-columns: 1fr; gap: 0.2rem; }
}