/* =========================================
   Custom Properties
   ========================================= */

:root {
  --color-bg: #FAFAFA;
  --color-surface: #FFFFFF;
  --color-text: #1A1A1A;
  --color-text-secondary: #6B7280;
  --color-accent: #0D9488;
  --color-border: #E5E7EB;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", Consolas, monospace;

  --max-width: 1120px;
  --header-h: 64px;
  --radius: 6px;
  --transition: 0.2s ease;
}

[data-theme="dark"] {
  --color-bg: #121212;
  --color-surface: #1E1E1E;
  --color-text: #E0E0E0;
  --color-text-secondary: #9CA3AF;
  --color-accent: #2DD4BF;
  --color-border: #2A2A2A;
}

/* Color palettes */
[data-color="blue"] { --color-accent: #2563EB; }
[data-color="blue"][data-theme="dark"] { --color-accent: #60A5FA; }

[data-color="amber"] { --color-accent: #D97706; }
[data-color="amber"][data-theme="dark"] { --color-accent: #FBBF24; }

/* =========================================
   Reset & Base
   ========================================= */

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color var(--transition), color var(--transition);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a:hover {
  opacity: 0.8;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

ul {
  list-style: none;
}

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

.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 200;
  padding: 8px 16px;
  background: var(--color-accent);
  color: #fff;
  font-weight: 600;
  font-size: 0.875rem;
  border-radius: var(--radius);
  text-decoration: none;
  opacity: 0;
}

.skip-link:focus {
  top: 8px;
  opacity: 1;
}

/* =========================================
   Utilities
   ========================================= */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* =========================================
   Header
   ========================================= */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition), border-color var(--transition);
}

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

.nav__logo {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.nav__logo:hover {
  opacity: 1;
  color: var(--color-accent);
}

.nav__links {
  display: flex;
  gap: 32px;
}

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

.nav__links a:hover {
  color: var(--color-text);
  opacity: 1;
}

.nav__links a.active {
  color: var(--color-accent);
  opacity: 1;
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Language toggle */
.lang-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 32px;
  padding: 0 8px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: transparent;
  color: var(--color-text-secondary);
  font-size: 0.75rem;
  font-weight: 600;
  font-family: var(--font-sans);
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: color var(--transition), border-color var(--transition);
}

.lang-toggle:hover {
  color: var(--color-text);
  border-color: var(--color-text-secondary);
}

/* Theme toggle */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 32px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: transparent;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: color var(--transition), border-color var(--transition);
}

/* Color toggle */
.color-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 32px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: transparent;
  cursor: pointer;
  transition: border-color var(--transition);
}

.color-toggle:hover {
  border-color: var(--color-text-secondary);
}

.color-toggle__dot {
  display: block;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: var(--color-accent);
  transition: background-color var(--transition);
}

.theme-toggle:hover {
  color: var(--color-text);
  border-color: var(--color-text-secondary);
}

.theme-toggle__icon--moon {
  display: none;
}

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

[data-theme="dark"] .theme-toggle__icon--moon {
  display: block;
}

/* Burger menu */
.nav__burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 32px;
  padding: 0 6px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: transparent;
  cursor: pointer;
}

.nav__burger span {
  display: block;
  height: 2px;
  background-color: var(--color-text-secondary);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav__burger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav__burger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav__burger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

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

.hero {
  padding: calc(var(--header-h) + 80px) 0 80px;
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.hero__grid {
  display: flex;
  align-items: center;
  gap: 64px;
}

.hero__content {
  max-width: 720px;
  flex: 1;
}

.hero__photo-wrapper {
  flex-shrink: 0;
}

.hero__photo {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--color-accent);
  transition: border-color var(--transition);
}

.hero__greeting {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-accent);
  margin-bottom: 8px;
  letter-spacing: 0.02em;
}

.hero__title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 32px;
  color: var(--color-text);
}

.hero__bio {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 32px;
}

.hero__bio li {
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  padding-left: 16px;
  border-left: 2px solid var(--color-border);
  transition: border-color var(--transition);
}

.hero__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

.hero__separator {
  color: var(--color-border);
}

.hero__link {
  font-weight: 500;
}

/* =========================================
   Sections
   ========================================= */

.section {
  padding: 96px 0;
}

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

.section__title {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 48px;
  color: var(--color-text);
}

/* =========================================
   Skills search (inline tab)
   ========================================= */

.tab--search {
  padding: 10px 20px;
}

.tab-search-field {
  display: flex;
  align-items: center;
  margin-bottom: -1px;
}

.tab-search-field[hidden] {
  display: none;
}

.tab-search-field__input {
  width: 120px;
  padding: 10px 20px;
  border: none;
  border-bottom: 2px solid var(--color-accent);
  background: transparent;
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  outline: none;
  transition: color var(--transition);
}

.tab-search-field__input::placeholder {
  color: var(--color-text-secondary);
  font-weight: 400;
}

.tab-search-field__count {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  white-space: nowrap;
  padding: 10px 12px;
}

.tag.highlight {
  background-color: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

.tag.dimmed {
  opacity: 0.25;
}

/* =========================================
   Tabs
   ========================================= */

.tabs__tablist {
  display: contents;
}

.tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--color-border);
  transition: border-color var(--transition);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.tabs::-webkit-scrollbar {
  display: none;
}

.tab {
  padding: 10px 20px;
  border: none;
  border-bottom: 2px solid transparent;
  background: transparent;
  color: var(--color-text-secondary);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: color var(--transition), border-color var(--transition);
  margin-bottom: -1px;
  white-space: nowrap;
  flex-shrink: 0;
}

.tab:hover {
  color: var(--color-text);
}

.tab.active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

/* =========================================
   Skills
   ========================================= */

.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.skill-group {
  padding: 24px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: background-color var(--transition), border-color var(--transition);
}

.skill-group__title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
  transition: border-color var(--transition);
}

.skill-group__content {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.skill-sub {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.skill-sub__label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  display: inline-block;
  padding: 4px 10px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  transition: background-color var(--transition), color var(--transition), border-color var(--transition);
}

/* =========================================
   Services
   ========================================= */

.services-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 16px;
  align-items: stretch;
}

.service-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  align-self: center;
  color: var(--color-accent);
  opacity: 0.6;
}

.service-arrow__vertical {
  display: none;
}

.service-category {
  padding: 32px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.service-category:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
}

[data-theme="dark"] .service-category {
  background: var(--color-surface);
  border-color: transparent;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

[data-theme="dark"] .service-category:hover {
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}

.service-category__title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 28px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  text-align: center;
}

.service-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.service-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.service-item__icon {
  flex-shrink: 0;
  color: var(--color-accent);
  margin-top: 2px;
}

.service-item__name {
  display: block;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
}

.service-item__desc {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* =========================================
   Clients
   ========================================= */

.clients-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.client-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 32px 24px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-align: center;
  transition: background-color var(--transition), border-color var(--transition), transform var(--transition);
}

.client-card:hover {
  opacity: 1;
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.client-card__logo {
  height: 72px;
  width: auto;
  max-width: 180px;
  object-fit: contain;
  margin-bottom: 8px;
  filter: grayscale(100%) opacity(0.7);
  transition: filter var(--transition);
}

.client-card:hover .client-card__logo {
  filter: grayscale(0%) opacity(1);
}

.client-card__name {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-text);
}

.client-card__sub {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}

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

.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.contact-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.contact-item__icon {
  color: var(--color-accent);
  margin-bottom: 4px;
}

.contact-item__label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-secondary);
}

.contact-item__value {
  font-size: 1rem;
  font-weight: 500;
  word-break: break-word;
}

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

.footer {
  padding: 32px 0;
  border-top: 1px solid var(--color-border);
  transition: border-color var(--transition);
}

.footer p {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  text-align: center;
}

/* =========================================
   Animations
   ========================================= */

.anim-fade {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.anim-fade.visible {
  opacity: 1;
  transform: translateY(0);
}

/* =========================================
   Responsive — Tablet
   ========================================= */

@media (max-width: 900px) {
  .skills-grid {
    grid-template-columns: 1fr;
  }

  .services-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .service-arrow__horizontal {
    display: none;
  }

  .service-arrow__vertical {
    display: block;
  }

  .clients-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

/* =========================================
   Responsive — Mobile
   ========================================= */

@media (max-width: 640px) {
  :root {
    --header-h: 56px;
  }

  .nav__links {
    display: none;
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 8px 0;
    transition: background-color var(--transition);
  }

  .nav__links.open {
    display: flex;
  }

  .nav__links a {
    display: block;
    padding: 12px 24px;
    font-size: 1rem;
  }

  .nav__burger {
    display: flex;
  }

  .hero__grid {
    flex-direction: column-reverse;
    gap: 32px;
    text-align: center;
  }

  .hero__photo {
    width: 150px;
    height: 150px;
  }

  .hero {
    padding: calc(var(--header-h) + 48px) 0 48px;
    min-height: auto;
  }

  .hero__title {
    font-size: 2rem;
    margin-bottom: 24px;
  }

  .hero__bio li {
    font-size: 1rem;
  }

  .section {
    padding: 64px 0;
  }

  .section__title {
    font-size: 1.5rem;
    margin-bottom: 32px;
  }

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

  .service-category {
    padding: 24px;
  }

  .skill-group {
    padding: 20px;
  }
}

/* =========================================
   Reduced motion
   ========================================= */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .anim-fade {
    opacity: 1;
    transform: none;
    transition: none;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}

/* =========================================
   Print
   ========================================= */

@media print {
  .header,
  .theme-toggle,
  .lang-toggle,
  .nav__burger {
    display: none;
  }

  .hero {
    min-height: auto;
    padding-top: 0;
  }

  .section {
    padding: 32px 0;
  }

  body {
    color: #000;
    background: #fff;
  }
}