/* ==========================================================================
   Section Styles
   Layout and decoration for each page section.
   ========================================================================== */


/* ==========================================================================
   Hero
   ========================================================================== */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: var(--header-height);
}

/* Gradient orb background */
.hero__bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
  z-index: 0;
  pointer-events: none;
}

.hero__orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
  animation: orb-float 20s ease-in-out infinite alternate;
}

.hero__orb--primary {
  width: 500px;
  height: 500px;
  background: hsla(var(--color-primary-h), var(--color-primary-s), var(--color-primary-l), 0.2);
  top: -10%;
  right: -5%;
  animation-delay: 0s;
}

.hero__orb--accent {
  width: 400px;
  height: 400px;
  background: hsla(var(--color-accent-h), var(--color-accent-s), var(--color-accent-l), 0.12);
  bottom: -10%;
  left: -5%;
  animation-delay: -7s;
}

.hero__orb--secondary {
  width: 300px;
  height: 300px;
  background: hsla(280, 80%, 55%, 0.1);
  top: 50%;
  left: 40%;
  animation-delay: -14s;
}

@keyframes orb-float {
  0%   { transform: translate(0, 0) scale(1); }
  33%  { transform: translate(30px, -40px) scale(1.05); }
  66%  { transform: translate(-20px, 20px) scale(0.95); }
  100% { transform: translate(10px, -10px) scale(1.02); }
}

/* Grid lines behind hero */
.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--border-color) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.35;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black 20%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black 20%, transparent 70%);
  z-index: 0;
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 720px;
}

.hero__greeting {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-primary);
  margin-bottom: var(--space-6);
  padding: 0.4em 1em;
  border-radius: var(--radius-full);
  background: var(--color-primary-muted);
  border: var(--border-width) solid hsla(var(--color-primary-h), var(--color-primary-s), var(--color-primary-l), 0.2);
}

.hero__greeting .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-success);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.5; transform: scale(0.8); }
}

.hero__title {
  font-size: clamp(2.5rem, 5vw, 3.75rem);
  line-height: 1.1;
  margin-bottom: var(--space-6);
}

.hero__title .gradient-text {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent), var(--color-primary));
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: shine 4s linear infinite;
}

@keyframes shine {
  to {
    background-position: 200% center;
  }
}

.hero__subtitle {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-10);
  max-width: 560px;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-12);
}

/* Social stats row */
.hero__stats {
  display: flex;
  gap: var(--space-10);
}

.hero__stat {
  display: flex;
  flex-direction: column;
}

.hero__stat-value {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--text-primary);
}

.hero__stat-label {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
}

/* Scroll indicator */
.hero__scroll {
  position: absolute;
  bottom: var(--space-8);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  z-index: 1;
}

.hero__scroll-text {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
}

.hero__scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--color-primary), transparent);
  animation: scroll-line 2s ease-in-out infinite;
}

@keyframes scroll-line {
  0%   { transform: scaleY(0); transform-origin: top; opacity: 1; }
  50%  { transform: scaleY(1); transform-origin: top; opacity: 1; }
  51%  { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; opacity: 0.5; }
}

@media (max-width: 768px) {
  .hero__stats {
    gap: var(--space-6);
  }
  .hero__scroll {
    display: none;
  }
}


/* ==========================================================================
   Projects
   ========================================================================== */

.projects__filters {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-2);
  margin-bottom: var(--space-10);
}

.projects__filter-btn {
  padding: 0.5em 1.25em;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  background: var(--surface);
  border: var(--border-width) solid var(--border-color);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
}

.projects__filter-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-color-strong);
}

.projects__filter-btn--active {
  color: #fff;
  background: var(--color-primary);
  border-color: var(--color-primary);
}

.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--space-6);
}

/* Hover overlay for project cards */
.project-card__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, transparent 60%);
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-out);
  display: flex;
  align-items: flex-end;
  padding: var(--space-6);
}

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

.project-card__image-wrap {
  position: relative;
  overflow: hidden;
}

.project-card__image-wrap img {
  transition: transform var(--duration-slow) var(--ease-out);
}

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

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


/* ==========================================================================
   Skills / Tech Stack
   ========================================================================== */

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

.skills__category {
  background: var(--surface);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all var(--duration-normal) var(--ease-out);
}

.skills__category:hover {
  border-color: var(--border-color-strong);
  box-shadow: var(--shadow-md);
}

.skills__category-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--color-primary-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-4);
  color: var(--color-primary);
  animation: float-icon 4s ease-in-out infinite;
}

@keyframes float-icon {
  0% { transform: translateY(0); }
  50% { transform: translateY(-5px); }
  100% { transform: translateY(0); }
}

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

.skills__category-title {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-4);
}

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


/* ==========================================================================
   Experience / Timeline
   ========================================================================== */

.timeline {
  position: relative;
  max-width: 800px;
  margin-inline: auto;
}

/* Vertical line */
.timeline::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-primary), var(--border-color), transparent);
}

.timeline__item {
  position: relative;
  padding-left: 56px;
  padding-bottom: var(--space-10);
}

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

/* Dot on the line */
.timeline__dot {
  position: absolute;
  left: 12px;
  top: 4px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 3px solid var(--color-primary);
  z-index: 1;
  transition: all var(--duration-fast) var(--ease-out);
}

.timeline__item:hover .timeline__dot {
  background: var(--color-primary);
  box-shadow: 0 0 16px hsla(var(--color-primary-h), var(--color-primary-s), var(--color-primary-l), 0.8);
  transform: scale(1.2);
}

.timeline__date {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  margin-bottom: var(--space-2);
}

.timeline__card {
  background: var(--surface);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all var(--duration-normal) var(--ease-out);
}

.timeline__card:hover {
  border-color: var(--border-color-strong);
  box-shadow: var(--shadow-md);
}

.timeline__title {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.timeline__org {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
  margin-bottom: var(--space-3);
}

.timeline__description {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}

.timeline__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
}


/* ==========================================================================
   Blog / Notes
   ========================================================================== */

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

.blog-card {
  background: var(--surface);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all var(--duration-normal) var(--ease-out);
  display: flex;
  flex-direction: column;
}

.blog-card:hover {
  border-color: var(--border-color-strong);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.blog-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  margin-bottom: var(--space-4);
}

.blog-card__meta-divider {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--text-tertiary);
}

.blog-card__title {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-3);
  line-height: var(--leading-tight);
}

.blog-card__excerpt {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
  flex: 1;
  margin-bottom: var(--space-4);
}

.blog-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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


/* ==========================================================================
   Contact
   ========================================================================== */

.contact__wrapper {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: var(--space-10);
  align-items: start;
}

.contact__info {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.contact__info-item {
  display: flex;
  gap: var(--space-4);
}

.contact__info-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--color-primary-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--color-primary);
}

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

.contact__info-label {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
  margin-bottom: var(--space-1);
}

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

.contact__social {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.contact__social-link {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--surface);
  border: var(--border-width) solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--duration-fast) var(--ease-out);
}

.contact__social-link:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background: var(--color-primary-muted);
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 4px 12px hsla(var(--color-primary-h), var(--color-primary-s), var(--color-primary-l), 0.3);
}

.contact__social-link svg {
  width: 18px;
  height: 18px;
}

.contact__form-wrapper {
  background: var(--surface);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
}

.contact__form {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.contact__form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
}

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

  .contact__form-row {
    grid-template-columns: 1fr;
  }
}


/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
  border-top: var(--border-width) solid var(--border-color);
  padding-block: var(--space-12);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer__copy {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
}

.footer__links {
  display: flex;
  gap: var(--space-6);
}

.footer__link {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  transition: color var(--duration-fast) var(--ease-out);
}

.footer__link:hover {
  color: var(--color-primary);
}

@media (max-width: 480px) {
  .footer__inner {
    flex-direction: column;
    text-align: center;
  }
}