/* Theme tokens */
:root {
  color-scheme: light dark;
  --color-primary: light-dark(#294172, #8bb9f0);
  --color-accent: light-dark(#3c6eb4, #32699f);
  --color-bg: light-dark(#fff, #111820);
  --color-surface: light-dark(#f2f4f7, #1b2530);
  --color-text: light-dark(#17212b, #e8edf2);
  --color-text-muted: light-dark(#4c5661, #b0bdc8);
  --color-border: light-dark(#d5dce4, #354554);
  --gradient-brand: linear-gradient(120deg, #294172, #32699f 60%, #3975ad);
  --color-header-text: #fff;
  --color-header-hover: light-dark(rgb(255 255 255 / 0.16), rgb(255 255 255 / 0.12));
  --color-shadow: light-dark(rgb(23 33 43 / 0.1), rgb(0 0 0 / 0.3));
  --font-body: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --space-2: 1rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --radius: 0.375rem;
  --transition: 220ms cubic-bezier(0.2, 0.7, 0.2, 1);
  --container-width: 104rem;
}

/* Explicit theme selections override the system color scheme. */
:root[data-theme="light"] {
  color-scheme: light;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --gradient-brand: linear-gradient(120deg, #3975ad, #32699f 60%, #294172);
}

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

/* Base document styles */
html {
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background-color 240ms ease, color 240ms ease;
}

/* Page loading state */
body > header,
body > main,
body > footer {
  opacity: 1;
  transform: translateY(0);
  transition:
    opacity 420ms ease,
    transform 420ms cubic-bezier(0.2, 0.7, 0.2, 1);
}

html.is-loading body > :not(.site-loader) {
  visibility: hidden;
}

html.is-loading body > header,
html.is-loading body > main,
html.is-loading body > footer {
  opacity: 0;
  transform: translateY(0.75rem);
}

.site-loader {
  position: fixed;
  z-index: 1000;
  inset: 0;
  display: grid;
  align-content: center;
  justify-items: center;
  gap: 1rem;
  background: var(--color-bg);
  color: var(--color-text);
  opacity: 1;
  transition: opacity 320ms ease, visibility 0s linear 320ms;
}

html.is-loaded .site-loader {
  visibility: hidden;
  opacity: 0;
}

.loader-spinner {
  width: 2.5rem;
  aspect-ratio: 1;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: loader-spin 800ms linear infinite;
}

.loader-label {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

@keyframes loader-spin {
  to {
    transform: rotate(1turn);
  }
}

/* Shared element defaults */
img {
  max-width: 100%;
  height: auto;
}

button {
  font: inherit;
}

a {
  color: inherit;
}

/* Accessibility */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  padding: 0.5rem 1rem;
  background: var(--color-primary);
  color: var(--color-bg);
  z-index: 100;
  border-radius: var(--radius);
  text-decoration: none;
}

.skip-link:focus {
  top: 1rem;
}

/* Page layout and section spacing */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: clamp(var(--space-2), 4vw, var(--space-5));
}

.section {
  padding-block: clamp(var(--space-5), 7vw, 6rem);
  scroll-margin-top: 5rem;
}

.grid {
  display: grid;
  gap: clamp(var(--space-2), 2.5vw, var(--space-4));
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 20rem), 1fr));
  margin-top: 2rem;
}

.work-section .grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  max-width: 100rem;
  margin-inline: auto;
}

.work-section > h2 {
  text-align: center;
}

#about > *,
#contact > * {
  max-width: calc(50vw - clamp(var(--space-2), 4vw, var(--space-5)));
}

/* Typography */
h1,
h2,
h3 {
  line-height: 1.2;
  font-weight: 700;
  color: var(--color-text);
}

h1 {
  max-width: 15ch;
  font-size: clamp(2.5rem, 6vw, 4.75rem);
  letter-spacing: -0.045em;
  margin-bottom: 1rem;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-bottom: 1rem;
}

h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

p {
  margin-bottom: 1rem;
  color: var(--color-text-muted);
}

.lead {
  max-width: 58ch;
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  color: inherit;
  opacity: 0.9;
}

/* Hero */
.hero {
  position: relative;
  isolation: isolate;
  display: grid;
  align-items: center;
  overflow: clip;
  min-height: clamp(42rem, calc(100svh - 4.75rem), 61rem);
  color: #fff;
  background: var(--gradient-brand);
  clip-path: polygon(0 0, 100% 0, 100% 94%, 0 100%);
}

.hero-content {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: inherit;
  padding-block: clamp(5rem, 9vw, 8rem) clamp(6rem, 10vw, 9rem);
}

.hero-portrait {
  position: absolute;
  z-index: -1;
  inset-block-end: 0;
  inset-inline-end: clamp(-8rem, calc(15rem - 18.75vw), -1rem);
  width: clamp(34rem, 57vw, 64rem);
  max-width: 64%;
  height: auto;
  object-fit: contain;
  object-position: bottom;
  opacity: 0.84;
  pointer-events: none;
  user-select: none;
}

.hero h1 {
  max-width: 13ch;
  color: inherit;
}

.hero-kicker {
  max-width: max-content;
  margin-bottom: 1.25rem;
  color: #fff;
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* Buttons and CV preview */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.875rem;
  padding: 0.75rem 1.5rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-weight: 600;
  text-decoration: none;
  transition: opacity var(--transition), transform var(--transition), box-shadow var(--transition);
}

.btn svg {
  width: 1.375rem;
  height: 1.375rem;
  flex: none;
  stroke-width: 2.2;
}

.btn:hover {
  opacity: 0.85;
  transform: translateY(-2px);
  box-shadow: 0 0.5rem 1rem var(--color-shadow);
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}

.btn-secondary {
  border-color: currentColor;
  color: inherit;
}

.hero .btn-primary {
  background: #fff;
  color: #294172;
}

.hero .btn-secondary {
  border-color: rgb(255 255 255 / 0.72);
  color: #fff;
}

.btn:focus-visible,
.icon-button:focus-visible,
.social-links a:focus-visible {
  outline-color: var(--color-accent);
}

.cta-group {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin-top: 2rem;
}

.cv-trigger {
  gap: 0.625rem;
  cursor: pointer;
}

.cv-trigger svg {
  width: 1.5rem;
  height: 1.5rem;
}

.preview-modal {
  position: fixed;
  inset: 50% auto auto 50%;
  display: none;
  grid-template-rows: auto minmax(0, 1fr);
  width: min(68rem, calc(100% - 2rem));
  height: min(90dvh, 58rem);
  max-height: 90dvh;
  padding: 0;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  background: var(--color-bg);
  color: var(--color-text);
  box-shadow: 0 1.5rem 5rem rgb(0 0 0 / 0.35);
  transform: translate(-50%, -50%);
}

.preview-modal:popover-open {
  display: grid;
}

.preview-modal::backdrop {
  background: rgb(0 0 0 / 0.55);
  backdrop-filter: blur(3px);
}

body:has(.preview-modal:popover-open)::before {
  position: fixed;
  z-index: 100;
  background: rgb(10 18 28 / 0.62);
  backdrop-filter: blur(3px);
  content: "";
  inset: 0;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.875rem clamp(1rem, 3vw, 1.5rem);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.modal-title {
  margin: 0;
  font-size: 1.25rem;
}

.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border: 1px solid var(--color-primary);
  border-radius: 0.4rem;
  background: var(--color-surface);
  color: var(--color-primary);
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--transition), color var(--transition);
}

.icon-button:hover {
  background: var(--color-accent);
  color: #fff;
}

.icon-button svg {
  width: 1.625rem;
  height: 1.625rem;
  stroke-width: 2.2;
}

.icon-button:focus-visible {
  outline-offset: 3px;
}

.modal-body {
  min-height: 0;
  overflow: auto;
  background: var(--color-surface);
}

.preview-frame {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 24rem;
  border: 0;
  background: #fff;
}

.preview-frame:focus-visible {
  outline-offset: -3px;
}

/* Project cards */
.card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  box-shadow: 0 0.5rem 1.75rem var(--color-shadow);
  transition: transform 240ms ease, box-shadow 240ms ease;
}

.card:hover,
.card:focus-within {
  transform: translateY(-0.25rem);
  box-shadow: 0 1rem 2.5rem var(--color-shadow);
}

.card-preview {
  position: relative;
  display: grid;
  min-height: 13rem;
  overflow: hidden;
  place-items: center;
  isolation: isolate;
  color: #fff;
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.04em;
}

.card-preview::before,
.card-preview::after {
  position: absolute;
  z-index: -1;
  content: "";
}

.card-preview-commerce {
  background: linear-gradient(135deg, #294172, #32699f 65%, #3975ad);
}

.card-preview-dashboard {
  background: linear-gradient(135deg, #153f62, #1c637f 60%, #26748a);
}

.card-preview-system {
  background: linear-gradient(135deg, #37316f, #574d95 60%, #62549d);
}

.preview-status {
  position: absolute;
  inset-inline-start: 1rem;
  inset-block-end: 1rem;
  padding: 0.45rem 0.7rem;
  border: 1px solid rgb(255 255 255 / 0.24);
  border-radius: 0.375rem;
  background: rgb(17 24 32 / 0.68);
  color: #fff;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.25;
  backdrop-filter: blur(8px);
}

.card-preview::before {
  inset: -40% -15% auto;
  height: 150%;
  border: 1px solid rgb(255 255 255 / 0.25);
  border-radius: 50%;
  transform: rotate(-20deg);
}

.card-preview::after {
  right: -2rem;
  bottom: -5rem;
  width: 13rem;
  aspect-ratio: 1;
  border: 1px solid rgb(255 255 255 / 0.25);
  border-radius: 50%;
  box-shadow: 0 0 0 1.75rem rgb(255 255 255 / 0.08), 0 0 0 3.5rem rgb(255 255 255 / 0.06);
}

.card-content {
  display: flex;
  flex: 1;
  flex-direction: column;
  padding: clamp(1.25rem, 2.5vw, 2rem);
}

.card-heading {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.card-heading h3 {
  margin: 0;
}

.tech-stack {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  list-style: none;
}

.tech-stack li {
  display: flex;
  width: 1.75rem;
  height: 1.75rem;
  align-items: center;
  justify-content: center;
}

.tech-stack iconify-icon {
  display: block;
  width: 1.5rem;
  height: 1.5rem;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.card-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.625rem;
  margin-top: auto;
  padding-top: 1.25rem;
  list-style: none;
}

.card-links li,
.card-links a {
  width: 100%;
}

.card-links a {
  display: inline-flex;
  min-height: 2.875rem;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.625rem 1rem;
  border: 1px solid var(--color-primary);
  border-radius: 0.4rem;
  background: var(--color-surface);
  color: var(--color-primary);
  font-size: 0.9375rem;
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
  transition: background-color var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
}

.card-links a:hover,
.card-links a:focus-visible {
  transform: translateY(-1px);
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}

.card-links svg {
  width: 1.375rem;
  height: 1.375rem;
  flex: none;
  stroke-width: 2.2;
}

/* Header and navigation */
body > header {
  padding-block: 0.75rem;
  position: sticky;
  top: 0;
  background: var(--gradient-brand);
  backdrop-filter: blur(12px);
  z-index: 10;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  min-height: 3.25rem;
}

.logo {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 4rem;
  height: 3.25rem;
  flex-shrink: 0;
  border-radius: var(--radius);
  transition: transform var(--transition);
}

.logo:hover {
  transform: translateY(-2px);
}

.logo img {
  width: 3.5rem;
  height: 3.5rem;
  object-fit: contain;
}

.site-nav {
  display: flex;
  align-items: center;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  align-items: center;
  gap: clamp(0.125rem, 1vw, 0.75rem);
  list-style: none;
}

.nav-links a {
  display: flex;
  align-items: center;
  padding: 0.625rem 0.75rem;
  min-height: 2.75rem;
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--color-header-text);
  font-weight: 500;
  transition:
    color var(--transition),
    background var(--transition);
}

.nav-links a:hover {
  color: var(--color-header-text);
  background: var(--color-header-hover);
}

.theme-toggle {
  display: inline-grid;
  width: 2.75rem;
  height: 2.75rem;
  place-items: center;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: transparent;
  color: var(--color-header-text);
  cursor: pointer;
  transition: background-color var(--transition);
}

.theme-toggle:hover {
  background: var(--color-header-hover);
}

.theme-toggle:focus-visible {
  outline-color: #fff;
}

.theme-icon {
  width: 1.5rem;
  height: 1.5rem;
  stroke-width: 2.2;
}

.theme-icon-sun {
  display: none;
}

.theme-icon-moon {
  display: block;
}

/* Theme toggle icon states */
:root[data-theme="dark"] .theme-icon-sun {
  display: block;
}

:root[data-theme="dark"] .theme-icon-moon {
  display: none;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --gradient-brand: linear-gradient(120deg, #3975ad, #32699f 60%, #294172);
  }

  :root:not([data-theme="light"]) .theme-icon-sun {
    display: block;
  }

  :root:not([data-theme="light"]) .theme-icon-moon {
    display: none;
  }
}

/* Contact and social links */
.social-heading {
  margin-top: var(--space-4);
}

.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-2);
  list-style: none;
}

.social-links a {
  display: grid;
  width: 3rem;
  height: 3rem;
  place-items: center;
  border: 1px solid var(--color-border);
  border-radius: 0.45rem;
  background: var(--color-surface);
  color: var(--color-primary);
  transition: background-color var(--transition), color var(--transition), transform var(--transition);
}

.social-links a:hover {
  transform: translateY(-2px);
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}

.social-links svg {
  width: 1.5rem;
  height: 1.5rem;
  stroke-width: 2.2;
}

.social-links a:focus-visible {
  outline-offset: 3px;
}

/* Footer */
footer {
  padding-block: 2rem;
  border-top: 1px solid var(--color-border);
  margin-top: 2rem;
  text-align: center;
}

small {
  color: var(--color-text-muted);
}

/* Responsive layout */
@media (max-width: 600px) {
  .work-section .grid {
    grid-template-columns: 1fr;
  }

  .card-preview {
    min-height: 4rem;
  }

  .preview-status {
    inset: 0.5rem 0.5rem auto auto;
  }

  #about > *,
  #contact > * {
    max-width: none;
  }

  .nav-container {
    align-items: center;
  }

  .nav-links {
    gap: 0;
  }

  .nav-links a {
    padding-inline: 0.4rem;
    font-size: 0.925rem;
  }

  .cta-group {
    flex-direction: column;
  }

  .hero-content {
    padding-block: 4.5rem 6rem;
  }

  .hero {
    min-height: 44rem;
  }

  .hero-portrait {
    inset-inline-end: -10rem;
    width: 30rem;
    max-width: none;
    opacity: 0.42;
  }

  .hero h1,
  .hero .lead {
    max-width: 18ch;
  }

  .preview-modal {
    width: calc(100% - 1rem);
    height: 94dvh;
    max-height: 94dvh;
    border-radius: 0.5rem;
  }

  .preview-frame {
    min-height: 18rem;
  }
}

/* Two-column tablet layout */
@media (min-width: 601px) and (max-width: 900px) {
  .work-section .grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* Three-column desktop layout */
@media (min-width: 901px) and (max-width: 1200px) {
  .work-section .grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

  body > header,
  body > main,
  body > footer {
    transform: none !important;
  }
}