/* ==========================================================================
   Portfolio — Pablo David Maieron
   Design system: CSS custom properties + BEM-ish naming
   ========================================================================== */

/* --------------------------------------------------------------------------
   0. Custom properties
   -------------------------------------------------------------------------- */
:root {
  /* Palette */
  --color-bg:          #0f172a;
  --color-bg-alt:      #1e293b;
  --color-surface:     #1e293b;
  --color-surface-2:   #273549;
  --color-border:      #334155;
  --color-accent:      #38bdf8;
  --color-accent-dark: #0ea5e9;
  --color-text:        #e2e8f0;
  --color-text-muted:  #94a3b8;
  --color-text-dim:    #64748b;
  --color-white:       #ffffff;

  /* Typography */
  --font-sans: "Inter", system-ui, -apple-system, sans-serif;
  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  1.875rem;
  --text-4xl:  2.25rem;
  --text-5xl:  3rem;

  /* Spacing */
  --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;

  /* Layout */
  --container-max: 1200px;
  --nav-height:    4rem;

  /* Borders */
  --radius-sm:  0.375rem;
  --radius-md:  0.5rem;
  --radius-lg:  0.75rem;
  --radius-xl:  1rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.3), 0 1px 2px -1px rgb(0 0 0 / 0.3);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.4);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4), 0 4px 6px -4px rgb(0 0 0 / 0.4);

  /* Transitions */
  --transition-fast:   150ms ease;
  --transition-base:   250ms ease;
  --transition-slow:   400ms ease;
}

/* --------------------------------------------------------------------------
   1. Reset & base
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

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

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

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

/* --------------------------------------------------------------------------
   2. Layout utilities
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.section {
  padding-block: var(--space-20);
}

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

/* --------------------------------------------------------------------------
   3. Typography utilities
   -------------------------------------------------------------------------- */
.section__title {
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: var(--space-10);
  position: relative;
  padding-bottom: var(--space-4);
}

.section__title::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 3rem;
  height: 3px;
  background: var(--color-accent);
  border-radius: var(--radius-full);
}

.link {
  color: var(--color-accent);
  transition: color var(--transition-fast);
}

.link:hover {
  color: var(--color-accent-dark);
  text-decoration: underline;
}

/* --------------------------------------------------------------------------
   4. Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  border: 2px solid transparent;
  transition: background-color var(--transition-fast),
              border-color var(--transition-fast),
              color var(--transition-fast),
              transform var(--transition-fast),
              box-shadow var(--transition-fast);
  white-space: nowrap;
  text-decoration: none;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn:active {
  transform: translateY(0);
}

.btn--primary {
  background-color: var(--color-accent);
  color: var(--color-bg);
  border-color: var(--color-accent);
}

.btn--primary:hover {
  background-color: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
}

.btn--ghost {
  background-color: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

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

.btn--lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
}

/* --------------------------------------------------------------------------
   5. Tags / badges
   -------------------------------------------------------------------------- */
.tag {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  background-color: var(--color-surface-2);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 500;
  line-height: 1.5;
  white-space: nowrap;
}

.tag--accent {
  background-color: rgb(56 189 248 / 0.1);
  color: var(--color-accent);
  border-color: rgb(56 189 248 / 0.3);
}

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

.tag-cloud--sm .tag {
  font-size: 0.7rem;
}

.badge {
  display: inline-block;
  padding: var(--space-1) var(--space-2);
  background-color: rgb(56 189 248 / 0.15);
  color: var(--color-accent);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* --------------------------------------------------------------------------
   6. Navigation
   -------------------------------------------------------------------------- */
.nav-wrapper {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgb(15 23 42 / 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  height: var(--nav-height);
  gap: var(--space-4);
}

.nav__brand {
  justify-self: start;
}

.nav .lang-switcher {
  justify-self: center;
}

.nav__links {
  justify-self: end;
}

.nav__toggle {
  justify-self: end;
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}

.nav__brand-initials {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-dark));
  color: var(--color-bg);
  font-weight: 800;
  font-size: var(--text-sm);
  border-radius: var(--radius-md);
  flex-shrink: 0;
}

.nav__brand-name {
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--color-white);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav__link {
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-white);
  background-color: var(--color-surface-2);
}

.nav__link--cta {
  background-color: var(--color-accent);
  color: var(--color-bg);
  font-weight: 600;
}

.nav__link--cta:hover {
  background-color: var(--color-accent-dark);
  color: var(--color-bg);
}

/* Language switcher */
.lang-switcher {
  display: inline-flex;
  align-items: center;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: 3px;
  gap: 2px;
}

.lang-switcher__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  line-height: 1;
  text-decoration: none;
  color: var(--color-text-dim);
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast);
  user-select: none;
}

a.lang-switcher__btn:hover {
  color: var(--color-text);
  background-color: var(--color-surface-2);
  text-decoration: none;
}

.lang-switcher__btn--active {
  background-color: var(--color-accent);
  color: var(--color-bg);
  cursor: default;
}

/* Hamburger */
.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 1.5rem;
  height: 1.125rem;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
}

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

/* --------------------------------------------------------------------------
   7. Hero
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  min-height: calc(100vh - var(--nav-height));
  display: flex;
  align-items: center;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-bg) 0%, #0c1a35 100%);
}

.hero__bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgb(56 189 248 / 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgb(56 189 248 / 0.04) 1px, transparent 1px);
  background-size: 4rem 4rem;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 30%, transparent 100%);
}

.hero__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-12);
  padding-block: var(--space-20);
}

.hero__text {
  flex: 1;
  max-width: 640px;
}

.hero__greeting {
  font-size: var(--text-lg);
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: var(--space-3);
  letter-spacing: 0.02em;
}

.hero__name {
  font-size: clamp(var(--text-4xl), 6vw, var(--text-5xl));
  font-weight: 800;
  color: var(--color-white);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-4);
}

.hero__role {
  font-size: var(--text-xl);
  color: var(--color-text-muted);
  font-weight: 400;
  margin-bottom: var(--space-4);
}

.hero__location {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-dim);
  margin-bottom: var(--space-8);
}

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

.hero__avatar {
  position: relative;
  width: 16rem;
  height: 16rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Dashed orbit — sits outside so overflow:hidden on the ring doesn't clip it */
.hero__avatar-orbit {
  position: absolute;
  inset: -10px;
  border-radius: 50%;
  border: 1px dashed rgb(56 189 248 / 0.25);
  animation: spin 30s linear infinite;
  pointer-events: none;
}

.hero__avatar-ring {
  width: 16rem;
  height: 16rem;
  border-radius: 50%;
  border: 2px solid rgb(56 189 248 / 0.4);
  overflow: hidden;
  box-shadow: 0 0 40px rgb(56 189 248 / 0.15);
  flex-shrink: 0;
}

.hero__avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  display: block;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

/* --------------------------------------------------------------------------
   8. About
   -------------------------------------------------------------------------- */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: var(--space-12);
  align-items: start;
}

.about__paragraph {
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: var(--space-5);
  font-size: var(--text-base);
}

.about__paragraph:last-child {
  margin-bottom: 0;
}

.meta-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
}

.meta-card__title {
  font-size: var(--text-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-dim);
  margin-bottom: var(--space-4);
}

.meta-card__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.meta-card__item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.meta-card__label {
  font-size: var(--text-xs);
  color: var(--color-text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.meta-card__value {
  font-size: var(--text-sm);
  color: var(--color-text);
}

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

.social-pill {
  padding: var(--space-1) var(--space-3);
  background-color: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.social-pill:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  text-decoration: none;
}

/* --------------------------------------------------------------------------
   9. Skills
   -------------------------------------------------------------------------- */
.skills__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--space-5);
}

.skill-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  transition: border-color var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
}

.skill-card:hover {
  border-color: rgb(56 189 248 / 0.4);
  transform: translateY(-4px);
  box-shadow: 0 0 20px rgb(56 189 248 / 0.08);
}

.skill-card__icon {
  font-size: 1.75rem;
  margin-bottom: var(--space-3);
  line-height: 1;
}

.skill-card__name {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: var(--space-2);
}

.skill-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   10. Languages
   -------------------------------------------------------------------------- */
.lang__grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-5);
}

.lang-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6) var(--space-8);
  min-width: 180px;
  text-align: center;
  transition: border-color var(--transition-base), transform var(--transition-base);
}

.lang-card:hover {
  border-color: rgb(56 189 248 / 0.4);
  transform: translateY(-2px);
}

.lang-card__name {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: var(--space-2);
}

.lang-card__level {
  display: inline-block;
  margin-bottom: var(--space-2);
}

.lang-card__note {
  font-size: var(--text-xs);
  color: var(--color-text-dim);
  margin-top: var(--space-2);
}

/* --------------------------------------------------------------------------
   11. References
   -------------------------------------------------------------------------- */
.refs__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-5);
}

.ref-card {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  transition: border-color var(--transition-base);
}

.ref-card:hover {
  border-color: rgb(56 189 248 / 0.4);
}

.ref-card__avatar {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-dark));
  color: var(--color-bg);
  font-size: var(--text-xl);
  font-weight: 800;
  flex-shrink: 0;
}

.ref-card__name {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-white);
  display: block;
  margin-bottom: var(--space-1);
}

.ref-card__role {
  font-size: var(--text-xs);
  color: var(--color-text-dim);
  line-height: 1.4;
}

/* --------------------------------------------------------------------------
   12. CTA section
   -------------------------------------------------------------------------- */
.cta-section {
  background: linear-gradient(135deg, #0c1a35, var(--color-bg));
  border-top: 1px solid var(--color-border);
}

.cta-section__inner {
  text-align: center;
  max-width: 600px;
  margin-inline: auto;
}

.cta-section__title {
  font-size: var(--text-3xl);
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: var(--space-4);
}

.cta-section__body {
  color: var(--color-text-muted);
  font-size: var(--text-lg);
  margin-bottom: var(--space-8);
  line-height: 1.7;
}

/* --------------------------------------------------------------------------
   13. Page header (Curriculum / Projects)
   -------------------------------------------------------------------------- */
.page-header {
  padding-block: var(--space-16) var(--space-12);
  background: linear-gradient(135deg, var(--color-bg) 0%, #0c1a35 100%);
  border-bottom: 1px solid var(--color-border);
  text-align: center;
}

.page-header__title {
  font-size: var(--text-4xl);
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: var(--space-3);
  letter-spacing: -0.02em;
}

.page-header__subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
}

/* --------------------------------------------------------------------------
   14. Curriculum layout
   -------------------------------------------------------------------------- */
.cv-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--space-10);
  padding-block: var(--space-12);
  align-items: start;
}

.cv-sidebar {
  position: sticky;
  top: calc(var(--nav-height) + var(--space-6));
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.sidebar-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
}

.sidebar-card__avatar {
  width: 5rem;
  height: 5rem;
  border-radius: 50%;
  border: 2px solid rgb(56 189 248 / 0.4);
  overflow: hidden;
  margin-inline: auto;
  margin-bottom: var(--space-3);
  box-shadow: 0 0 16px rgb(56 189 248 / 0.12);
}

.sidebar-card__avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  display: block;
}

.sidebar-card__name {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-white);
  text-align: center;
  margin-bottom: var(--space-1);
}

.sidebar-card__role {
  font-size: var(--text-xs);
  color: var(--color-accent);
  text-align: center;
  font-weight: 500;
}

.sidebar-card__heading {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-dim);
  margin-bottom: var(--space-3);
}

.sidebar-card__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.sidebar-card__item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.sidebar-card__item--lang {
  justify-content: space-between;
}

.sidebar-card__lang-name {
  font-weight: 500;
  color: var(--color-text);
}

.sidebar-card__icon {
  color: var(--color-text-dim);
  font-style: normal;
  flex-shrink: 0;
}

/* CV main */
.cv-main {
  display: flex;
  flex-direction: column;
  gap: var(--space-12);
}

.cv-section__title {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border);
}

/* --------------------------------------------------------------------------
   15. Timeline
   -------------------------------------------------------------------------- */
.timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.timeline::before {
  content: "";
  position: absolute;
  left: 0.5rem;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-accent), var(--color-border));
  border-radius: var(--radius-full);
}

.timeline__item {
  display: flex;
  gap: var(--space-5);
  padding-bottom: var(--space-6);
}

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

.timeline__marker {
  flex-shrink: 0;
  width: 1rem;
  height: 1rem;
  border-radius: 50%;
  background-color: var(--color-accent);
  border: 2px solid var(--color-bg);
  margin-top: 0.35rem;
  box-shadow: 0 0 0 3px rgb(56 189 248 / 0.2);
  z-index: 1;
}

.timeline__body {
  flex: 1;
  padding-bottom: var(--space-5);
  border-bottom: 1px solid var(--color-border);
}

.timeline__item:last-child .timeline__body {
  border-bottom: none;
  padding-bottom: 0;
}

.timeline__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-bottom: var(--space-2);
}

.timeline__role {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: var(--space-1);
}

.timeline__company {
  font-size: var(--text-sm);
  color: var(--color-accent);
  font-weight: 500;
}

.timeline__period {
  font-size: var(--text-xs);
  color: var(--color-text-dim);
  white-space: nowrap;
  background-color: var(--color-surface-2);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  flex-shrink: 0;
}

.timeline__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-3);
}

.timeline__note {
  display: inline-block;
  font-size: var(--text-xs);
  color: var(--color-text-dim);
  font-style: italic;
  margin-top: var(--space-1);
}

/* --------------------------------------------------------------------------
   16. Projects
   -------------------------------------------------------------------------- */
.projects-container {
  padding-block: var(--space-10) var(--space-20);
  display: flex;
  flex-direction: column;
  gap: var(--space-16);
}

.filter-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding-block: var(--space-6);
  border-bottom: 1px solid var(--color-border);
}

.filter-btn {
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  background-color: transparent;
  color: var(--color-text-muted);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  transition: border-color var(--transition-fast),
              color var(--transition-fast),
              background-color var(--transition-fast);
}

.filter-btn:hover,
.filter-btn--active {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background-color: rgb(56 189 248 / 0.08);
}

.project-category {
  transition: opacity var(--transition-base);
}

.project-category--hidden {
  display: none;
}

.project-category__title {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.project-category__title::before {
  content: "";
  display: block;
  width: 4px;
  height: 1.5em;
  background: var(--color-accent);
  border-radius: var(--radius-full);
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-5);
}

.project-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  transition: border-color var(--transition-base),
              transform var(--transition-base),
              box-shadow var(--transition-base);
}

.project-card:hover {
  border-color: rgb(56 189 248 / 0.4);
  transform: translateY(-4px);
  box-shadow: 0 0 24px rgb(56 189 248 / 0.08);
}

/* Linked card — full-card clickable overlay */
.project-card--linked {
  position: relative;
  cursor: pointer;
}

.project-card__link {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  z-index: 1;
}

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

.project-card__ext-icon {
  width: 0.85em;
  height: 0.85em;
  flex-shrink: 0;
  color: var(--color-accent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.project-card--linked:hover .project-card__ext-icon {
  opacity: 1;
}

.project-card__body {
  flex: 1;
}

.project-card__title {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: var(--space-2);
  line-height: 1.3;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.project-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   17. Footer
   -------------------------------------------------------------------------- */
.footer {
  background-color: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-8);
}

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

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

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

.footer__social-link {
  color: var(--color-text-dim);
  transition: color var(--transition-fast);
}

.footer__social-link:hover {
  color: var(--color-accent);
}

/* --------------------------------------------------------------------------
   18. Responsive
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .cv-layout {
    grid-template-columns: 240px 1fr;
    gap: var(--space-8);
  }

  .about__grid {
    grid-template-columns: 1fr 280px;
  }
}

@media (max-width: 768px) {
  /* Nav mobile — collapses to: brand | switcher | hamburger */
  .nav {
    grid-template-columns: 1fr auto auto;
    position: relative;
  }

  .nav__toggle {
    display: flex;
    justify-self: end;
  }

  /* Switcher stays centred between brand and toggle */
  .nav .lang-switcher {
    justify-self: center;
  }

  .nav__links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background-color: var(--color-bg-alt);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-3);
    gap: var(--space-1);
    /* span all 3 grid columns */
    grid-column: 1 / -1;
  }

  .nav__links.nav__links--open {
    display: flex;
  }

  .nav__link {
    padding: var(--space-3) var(--space-4);
  }

  /* Hero */
  .hero__inner {
    flex-direction: column-reverse;
    text-align: center;
    padding-block: var(--space-12);
  }

  .hero__location {
    justify-content: center;
  }

  .hero__actions {
    justify-content: center;
  }

  .hero__avatar-ring {
    width: 10rem;
    height: 10rem;
  }

  .hero__avatar-initials {
    font-size: var(--text-2xl);
  }

  /* About */
  .about__grid {
    grid-template-columns: 1fr;
  }

  /* CV */
  .cv-layout {
    grid-template-columns: 1fr;
  }

  .cv-sidebar {
    position: static;
  }

  /* Timeline */
  .timeline__header {
    flex-direction: column;
    align-items: flex-start;
  }

  /* Sections */
  .section {
    padding-block: var(--space-12);
  }
}

@media (max-width: 480px) {
  .container {
    padding-inline: var(--space-4);
  }

  .hero__name {
    font-size: var(--text-3xl);
  }

  .section__title {
    font-size: var(--text-2xl);
  }

  .page-header__title {
    font-size: var(--text-3xl);
  }

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

/* --------------------------------------------------------------------------
   19. Animations (respects prefers-reduced-motion)
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: no-preference) {
  .skill-card,
  .project-card,
  .ref-card,
  .lang-card {
    animation: fade-up 0.5s ease both;
  }

  @keyframes fade-up {
    from {
      opacity: 0;
      transform: translateY(16px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}