/* =============================================
   CSS Custom Properties (Design Tokens)
   ============================================= */
:root {
  /* Colors — Light mode */
  --color-bg:         #ffffff;
  --color-bg-alt:     #f8fafc;
  --color-surface:    #ffffff;
  --color-border:     #e2e8f0;
  --color-text:       #1e293b;
  --color-text-muted: #64748b;
  --color-heading:    #0f172a;

  --color-primary:        #2563eb;
  --color-primary-hover:  #1d4ed8;
  --color-primary-light:  #eff6ff;
  --color-primary-muted:  #bfdbfe;

  --color-success: #16a34a;
  --color-error:   #dc2626;

  /* Shadows */
  --shadow-sm:  0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md:  0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg:  0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-xl:  0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);

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

  /* Spacing scale */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Layout */
  --max-width: 1100px;
  --nav-height: 4rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  --portrait-fade-edge: 22%;
  --portrait-fade-radial: 65%;
}

/* Dark mode overrides */
[data-theme="dark"] {
  --color-bg:         #0f172a;
  --color-bg-alt:     #1e293b;
  --color-surface:    #1e293b;
  --color-border:     #334155;
  --color-text:       #e2e8f0;
  --color-text-muted: #94a3b8;
  --color-heading:    #f1f5f9;

  --color-primary:        #3b82f6;
  --color-primary-hover:  #60a5fa;
  --color-primary-light:  #1e3a5f;
  --color-primary-muted:  #1e40af;

  --shadow-sm:  0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md:  0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --shadow-lg:  0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
  --shadow-xl:  0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.4);

  --portrait-fade-edge: 30%;
  --portrait-fade-radial: 48%;
}


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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
  scrollbar-gutter: stable;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color var(--transition-base), color var(--transition-base);
  overflow-x: hidden;
}

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

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

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

ul {
  list-style: none;
}

button {
  cursor: pointer;
  font: inherit;
  border: none;
  background: none;
  color: inherit;
}

/* Focus visible for keyboard nav */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  background: var(--color-primary);
  color: #fff;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  z-index: 1000;
  font-weight: 500;
}

.skip-link:focus {
  top: var(--space-md);
}


/* =============================================
   Utility Classes
   ============================================= */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.section {
  padding: var(--space-4xl) 0;
}

.section__title {
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  color: var(--color-heading);
  margin-bottom: var(--space-2xl);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  white-space: nowrap;
}

.section__title::after {
  content: '';
  display: block;
  height: 1px;
  flex: 1;
  background: var(--color-border);
}

.section__title--center {
  justify-content: center;
}

.section__title--center::after {
  display: none;
}

.section--alt {
  background: var(--color-bg-alt);
}

.section__title--link {
  text-decoration: none;
  color: inherit;
}

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

.section__title--link::after {
  transition: width var(--transition-fast);
}

.section__title--link:hover::after {
  width: 5rem;
}


/* =============================================
   Buttons
   ============================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.75rem 1.75rem;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-primary);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}

.btn--primary:hover {
  background: var(--color-primary-hover);
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--outline {
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
  background: transparent;
}

.btn--outline:hover {
  background: var(--color-primary-light);
  color: var(--color-primary-hover);
  transform: translateY(-1px);
}

.btn--submit {
  min-width: 180px;
  position: relative;
}

.btn--submit .btn__spinner {
  display: none;
  width: 18px;
  height: 18px;
  border: 2px solid transparent;
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  position: absolute;
}

.btn--submit.is-loading .btn__text {
  visibility: hidden;
}

.btn--submit.is-loading .btn__spinner {
  display: block;
}

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


/* =============================================
   Header & Navigation
   ============================================= */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  background: var(--color-bg);
  border-bottom: 1px solid transparent;
  transition: background var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.header.is-scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
  background: color-mix(in srgb, var(--color-bg) 85%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

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

.nav__logo {
  color: var(--color-primary) !important;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.nav__logo svg {
  display: block;
  width: 44px;
  height: 44px;
}

.nav__list {
  display: flex;
  gap: var(--space-lg);
}

.nav__link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  position: relative;
  padding: var(--space-xs) 0;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition-base);
}

.nav__link:hover,
.nav__link.is-active {
  color: var(--color-text);
}

.nav__link:hover::after,
.nav__link.is-active::after {
  width: 100%;
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* Theme toggle */
.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.theme-toggle:hover {
  background: var(--color-bg-alt);
  color: var(--color-text);
}

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

/* Language toggle */
.lang-toggle {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.lang-toggle:hover {
  background: var(--color-bg-alt);
  color: var(--color-text);
}

.lang-toggle__text {
  font-size: 0.8125rem;
  font-weight: 600;
  line-height: 1;
}

/* Mobile burger */
.nav__burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  border-radius: var(--radius-md);
}

.nav__burger:hover {
  background: var(--color-bg-alt);
}

.nav__burger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

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


/* =============================================
   Hero Section
   ============================================= */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: var(--nav-height) 0 var(--space-4xl);
}

.hero__greeting {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

.hero__name {
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 800;
  color: var(--color-heading);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.hero__title {
  font-size: clamp(2rem, 6vw, 4rem);
  font-weight: 700;
  color: var(--color-text-muted);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-lg);
}

.hero__subtitle {
  max-width: 540px;
  font-size: 1.125rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-xl);
}

.hero__cta {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}


/* =============================================
   About Section
   ============================================= */
.about {
  background: var(--color-bg-alt);
}

.about__grid {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: var(--space-3xl);
  align-items: center;
}

.about__text p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.about__text p:last-child {
  margin-bottom: 0;
}

.about__image {
  display: flex;
  justify-content: center;
}

.about__image-squircle {
  display: block;
  width: 260px;
  height: 260px;
  border-radius: 30%;
  overflow: hidden;
  -webkit-mask-image:
    linear-gradient(to right, transparent, black var(--portrait-fade-edge), black calc(100% - var(--portrait-fade-edge)), transparent),
    linear-gradient(to bottom, transparent, black var(--portrait-fade-edge), black calc(100% - var(--portrait-fade-edge)), transparent),
    radial-gradient(circle at center, black var(--portrait-fade-radial), transparent 100%);
  -webkit-mask-composite: source-in;
  mask-image:
    linear-gradient(to right, transparent, black var(--portrait-fade-edge), black calc(100% - var(--portrait-fade-edge)), transparent),
    linear-gradient(to bottom, transparent, black var(--portrait-fade-edge), black calc(100% - var(--portrait-fade-edge)), transparent),
    radial-gradient(circle at center, black var(--portrait-fade-radial), transparent 100%);
  mask-composite: intersect;
}

.about__image-img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-base);
}

.about__image-img:hover {
  transform: scale(1.04);
}


/* =============================================
   Skills Section
   ============================================= */
.skills__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.skill-card {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl) var(--space-xl);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.skill-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.skill-card__icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-lg);
}

.skill-card__title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-heading);
  margin-bottom: var(--space-md);
}

.skill-card__list li {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  padding: var(--space-xs) 0;
  padding-left: var(--space-lg);
  position: relative;
}

.skill-card__list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 8px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px;
}


/* =============================================
   Experience Section (Timeline)
   ============================================= */
.experience {
  background: var(--color-bg-alt);
}

.experience__timeline {
  position: relative;
  padding-left: var(--space-2xl);
}

/* Vertical line */
.experience__timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--color-border);
}

.experience-card {
  position: relative;
  margin-bottom: var(--space-2xl);
  padding-bottom: 0;
}

.experience-card:last-child {
  margin-bottom: 0;
}

/* Timeline dot */
.experience-card__timeline-dot {
  position: absolute;
  left: calc(-1 * var(--space-2xl) + 2px);
  top: 6px;
  width: 12px;
  height: 12px;
  background: var(--color-primary);
  border: 3px solid var(--color-bg-alt);
  border-radius: 50%;
  z-index: 1;
}

.experience-card__content {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl) var(--space-2xl);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.experience-card__content:hover {
  box-shadow: var(--shadow-md);
  transform: translateX(4px);
}

.experience-card__header {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-bottom: var(--space-sm);
}

.experience-card__date {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 3px 10px;
  border-radius: 999px;
}

.experience-card__location {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.experience-card__role {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-heading);
  margin-bottom: 2px;
}

.experience-card__company {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

.experience-card__description {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
  line-height: 1.6;
}

.experience-card__highlights {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.experience-card__highlights li {
  position: relative;
  padding-left: var(--space-lg);
  font-size: 0.9375rem;
  color: var(--color-text);
  line-height: 1.6;
}

.experience-card__highlights li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  background: var(--color-primary-muted);
  border-radius: 50%;
}


/* =============================================
   Projects Section
   ============================================= */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-xl);
}

.project-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.project-card__image {
  position: relative;
  height: 200px;
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary-muted));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}

.project-card__image::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-slow);
}

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

.project-card__body {
  padding: var(--space-xl);
}

.project-card__title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-heading);
  margin-bottom: var(--space-sm);
}

.project-card__description {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.project-card__tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 2px 10px;
  border-radius: 999px;
}

.project-card__links {
  display: flex;
  gap: var(--space-md);
}

.project-card__link {
  font-size: 0.875rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
}


/* =============================================
   Blog Section
   ============================================= */
.blog {
  background: var(--color-bg-alt);
}

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

.blog-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.blog-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.blog-card__image {
  height: 200px;
  background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-bg-alt) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  position: relative;
  overflow: hidden;
}

.blog-card__image::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-slow);
}

.blog-card:hover .blog-card__image::after {
  transform: scaleX(1);
}

.blog-card__body {
  padding: var(--space-xl);
}

.blog-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.blog-card__date {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.blog-card__read-time {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.blog-card__title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-heading);
  margin-bottom: var(--space-sm);
  line-height: 1.4;
}

.blog-card__excerpt {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.blog-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.blog-card__tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 2px 10px;
  border-radius: 999px;
}

.blog-card__read-more {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  transition: gap var(--transition-fast);
}

.blog-card__read-more:hover {
  gap: var(--space-sm);
  color: var(--color-primary-hover);
}


/* Project Detail Overlay */
.project-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

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

.project-overlay__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.project-overlay__panel {
  position: relative;
  width: min(90vw, 640px);
  max-height: 85vh;
  overflow-y: auto;
  background: var(--color-bg);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  box-shadow: var(--shadow-xl);
}

.project-overlay__close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.project-overlay__close:hover {
  background: var(--color-bg-alt);
  color: var(--color-text);
}

.project-detail__title {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-heading);
  margin-bottom: var(--space-md);
}

.project-detail__description {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: var(--space-lg);
}

.project-detail__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-lg);
}

.project-detail__tag {
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.project-detail__links {
  display: flex;
  gap: var(--space-md);
}

.project-detail__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.875rem;
  font-weight: 500;
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  text-decoration: none;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.project-detail__link:hover {
  background: var(--color-bg-alt);
  border-color: var(--color-primary);
}

/* Blog Detail Overlay */
.blog-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

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

.blog-overlay__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.blog-overlay__panel {
  position: relative;
  width: min(100%, 760px);
  max-height: calc(100vh - 4rem);
  margin: 2rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  transform: translateY(16px);
  transition: transform var(--transition-base);
}

.blog-overlay.is-open .blog-overlay__panel {
  transform: translateY(0);
}

.blog-overlay__close {
  position: sticky;
  top: var(--space-md);
  float: right;
  z-index: 10;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  margin-right: var(--space-md);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.blog-overlay__close:hover {
  background: var(--color-bg-alt);
  color: var(--color-text);
}

/* Blog Post (full article inside overlay) */
.blog-post {
  padding: var(--space-2xl) var(--space-2xl) var(--space-3xl);
}

.blog-post__meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.blog-post__title {
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  font-weight: 700;
  color: var(--color-heading);
  line-height: 1.3;
  margin-bottom: var(--space-lg);
}

.blog-post__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
}

.blog-post__tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 3px 12px;
  border-radius: 999px;
}

.blog-post__body {
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--color-text);
}

.blog-post__body h2 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-heading);
  margin: var(--space-2xl) 0 var(--space-md);
}

.blog-post__body h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-heading);
  margin: var(--space-xl) 0 var(--space-sm);
}

.blog-post__body p {
  margin-bottom: var(--space-lg);
}

.blog-post__body code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--color-bg-alt);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

.blog-post__body pre {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  overflow-x: auto;
  margin-bottom: var(--space-lg);
  font-size: 0.875rem;
  line-height: 1.7;
}

.blog-post__body pre code {
  background: none;
  padding: 0;
  border: none;
}

.blog-post__body ul,
.blog-post__body ol {
  margin-bottom: var(--space-lg);
  padding-left: var(--space-xl);
}

.blog-post__body li {
  margin-bottom: var(--space-sm);
}

.blog-post__body ul li {
  list-style: disc;
}

.blog-post__body blockquote {
  border-left: 3px solid var(--color-primary);
  padding: var(--space-sm) var(--space-lg);
  margin-bottom: var(--space-lg);
  color: var(--color-text-muted);
  font-style: italic;
  background: var(--color-bg-alt);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

/* Lock body scroll when overlay is open */



/* =============================================
   Footer
   ============================================= */
.footer {
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--color-border);
}

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

.footer__copy {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

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

.footer__link {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background var(--transition-fast);
}

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


/* =============================================
   Page Transition
   ============================================= */
body {
  animation: page-in 0.35s ease both;
}

@keyframes page-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* =============================================
   Scroll Reveal Animation
   ============================================= */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}


/* =============================================
   Photos Preview Carousel
   ============================================= */
.photos-preview__header {
  margin-bottom: var(--space-xl);
}

.photos-preview__carousel {
  position: relative;
  overflow: hidden;
  -webkit-mask-image: linear-gradient(
    to right,
    transparent 0%,
    black 8%,
    black 92%,
    transparent 100%
  );
  mask-image: linear-gradient(
    to right,
    transparent 0%,
    black 8%,
    black 92%,
    transparent 100%
  );
}

.photos-preview__track {
  display: flex;
  gap: var(--space-md);
  width: max-content;
  will-change: transform;
}

.photos-preview__card {
  flex-shrink: 0;
  width: 280px;
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  aspect-ratio: 4 / 3;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.photos-preview__card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.photos-preview__image-wrapper {
  width: 100%;
  height: 100%;
}

.photos-preview__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-base);
}

.photos-preview__card:hover .photos-preview__image {
  transform: scale(1.05);
}


/* =============================================
   Photo Gallery
   ============================================= */
.photos {
  min-height: 100vh;
  padding-top: calc(var(--nav-height) + var(--space-4xl));
}

.photos__grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-3xl);
}

.photos__empty {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 1.125rem;
  padding: var(--space-4xl) 0;
}

.photos__group-header {
  display: flex;
  align-items: baseline;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}

.photos__group-date {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-heading);
}

.photos__group-location {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

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

.photo-card {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  background: var(--color-bg-alt);
  aspect-ratio: 4 / 3;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.photo-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.photo-card__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-base);
}

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

/* =============================================
   Lightbox
   ============================================= */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.lightbox.is-open {
  opacity: 1;
  pointer-events: auto;
}

.lightbox__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.lightbox__panel {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  max-width: 90vw;
  max-height: 90vh;
}

.lightbox__content {
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 90vw;
  max-height: 85vh;
}

.lightbox__image {
  max-width: 100%;
  max-height: 75vh;
  object-fit: contain;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
}

.lightbox__caption {
  margin-top: var(--space-md);
  font-size: 0.9375rem;
  color: #e2e8f0;
  text-align: center;
}

.lightbox__counter {
  margin-top: var(--space-xs);
  font-size: 0.8125rem;
  color: #94a3b8;
  font-family: var(--font-mono);
}

.lightbox__close {
  position: fixed;
  top: var(--space-lg);
  right: var(--space-lg);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: rgba(0, 0, 0, 0.5);
  color: #e2e8f0;
  border: 1px solid rgba(255, 255, 255, 0.2);
  z-index: 10;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.lightbox__close:hover {
  background: rgba(0, 0, 0, 0.8);
}

.lightbox__nav {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.5);
  color: #e2e8f0;
  border: 1px solid rgba(255, 255, 255, 0.2);
  z-index: 10;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.lightbox__nav:hover {
  background: rgba(0, 0, 0, 0.8);
}

.lightbox__nav--prev {
  left: var(--space-lg);
}

.lightbox__nav--next {
  right: var(--space-lg);
}


/* =============================================
   Responsive Design
   ============================================= */
@media (max-width: 768px) {
  :root {
    --nav-height: 3.5rem;
    --space-4xl: 4rem;
    --space-3xl: 2.5rem;
  }

  .container {
    padding: 0 var(--space-lg);
  }

  .section__title {
    margin-bottom: var(--space-xl);
  }

  .section__title--center {
    justify-content: flex-start;
  }

  /* Mobile nav */
  .nav__list {
    position: fixed;
    top: var(--nav-height);
    right: 0;
    width: min(75vw, 320px);
    height: calc(100vh - var(--nav-height));
    flex-direction: column;
    gap: 0;
    background: var(--color-bg);
    border-left: 1px solid var(--color-border);
    padding: var(--space-xl);
    transform: translateX(100%);
    transition: transform var(--transition-base);
    box-shadow: var(--shadow-xl);
  }

  .nav__list.is-open {
    transform: translateX(0);
  }

  .nav__link {
    display: block;
    padding: var(--space-md) 0;
    font-size: 1rem;
    border-bottom: 1px solid var(--color-border);
  }

  .nav__burger {
    display: flex;
  }

  /* Hero */
  .hero {
    text-align: left;
  }

  .hero__subtitle {
    max-width: 100%;
  }

  /* About */
  .about__grid {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .about__image {
    order: -1;
  }

  .about__image-squircle {
    width: 200px;
    height: 200px;
  }

  /* Photos Preview */
  /* Skills */
  .skills__grid {
    grid-template-columns: 1fr;
  }

  /* Experience */
  .experience__timeline {
    padding-left: var(--space-lg);
  }

  .experience-card__timeline-dot {
    left: calc(-1 * var(--space-lg) + 2px);
  }

  .experience-card__content {
    padding: var(--space-lg);
  }

  .experience-card__header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-xs);
  }

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

  /* Blog */
  .blog__grid {
    grid-template-columns: 1fr;
  }

  .blog-overlay__panel {
    margin: 1rem;
    max-height: calc(100vh - 2rem);
  }

  .blog-post {
    padding: var(--space-xl) var(--space-lg) var(--space-2xl);
  }

  /* Lightbox */
  .lightbox__nav {
    width: 36px;
    height: 36px;
  }

  .lightbox__nav--prev {
    left: var(--space-sm);
  }

  .lightbox__nav--next {
    right: var(--space-sm);
  }

  .lightbox__image {
    max-height: 65vh;
  }

  /* Footer */
  .footer__content {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero__cta {
    flex-direction: column;
    align-items: flex-start;
  }

  .project-card__image {
    height: 160px;
  }

  .blog-card__image {
    height: 160px;
  }

  .photos__group-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-sm);
  }

  .photos-preview__card {
    width: 220px;
  }
}


/* =============================================
   Print Styles
   ============================================= */
@media print {
  .header,
  .photos-preview,
  .lightbox,
  .lightbox__nav,
  .nav__burger,
  .lang-toggle,
  .theme-toggle,
  .skip-link,
  .footer__links,
  .hero__cta,
  .contact__form,
  .blog-overlay {
    display: none !important;
  }

  body {
    color: #000;
    background: #fff;
    font-size: 12pt;
  }

  .section {
    padding: 1rem 0;
    break-inside: avoid;
  }
}