:root {
  --bg: #f7f7f4;
  --text: #151515;
  --muted: #6f6f68;
  --line: #deded8;
  --card: #ffffff;
  --accent: #111111;
  --header: rgba(247, 247, 244, 0.82);

  --success: #3aa76d;
  --error: #d94a4a;

  --radius-sm: 18px;
  --radius-md: 28px;
  --radius-lg: 32px;

  --transition: 0.18s ease;
}

body.dark {
  --bg: #0f0f0e;
  --text: #f4f1ea;
  --muted: #aaa59b;
  --line: #2d2c29;
  --card: #171715;
  --accent: #f4f1ea;
  --header: rgba(15, 15, 14, 0.82);
}

/* Page loader */

.page-loader {
  position: fixed;
  inset: 0;
  z-index: 99999;
  display: grid;
  place-items: center;
  background: var(--bg);
  color: var(--text);
  transition:
    opacity 0.45s ease,
    visibility 0.45s ease;
}

.page-loader.is-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader-inner {
  display: grid;
  gap: 18px;
  justify-items: center;
}

.loader-logo {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.04em;
}

.loader-line {
  width: 140px;
  height: 2px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--line);
}

.loader-line::after {
  content: "";
  display: block;
  width: 45%;
  height: 100%;
  border-radius: inherit;
  background: var(--text);
  animation: loader-move 1s ease-in-out infinite;
}

@keyframes loader-move {
  0% {
    transform: translateX(-110%);
  }

  100% {
    transform: translateX(260%);
  }
}

/* Reset */

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

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
  transition: background 0.25s ease, color 0.25s ease;
}

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

button,
input,
textarea,
select {
  font: inherit;
}

button {
  color: inherit;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid var(--text);
  outline-offset: 3px;
}

.container {
  width: min(1080px, calc(100% - 40px));
  margin: 0 auto;
}

/* Header */

.site-header,
header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--header);
  border-bottom: 1px solid rgba(222, 222, 216, 0.7);
  backdrop-filter: blur(14px);
}

body.dark .site-header,
body.dark header {
  border-bottom-color: rgba(255, 255, 255, 0.08);
}

.site-nav,
nav {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.04em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
  color: var(--muted);
  font-size: 15px;
}

.nav-links a {
  transition: color var(--transition);
}

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

/* Theme toggle */

.theme-toggle {
  width: 52px;
  height: 30px;
  padding: 3px;
  display: flex;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: color-mix(in srgb, var(--card) 70%, transparent);
  cursor: pointer;
  transition:
    transform var(--transition),
    background var(--transition),
    border-color var(--transition);
}

.theme-toggle:hover {
  transform: translateY(-1px);
  background: var(--card);
}

.theme-toggle-thumb {
  width: 22px;
  height: 22px;
  display: block;
  border-radius: 999px;
  background: var(--text);
  transition:
    transform 0.22s ease,
    background 0.22s ease;
}

body.dark .theme-toggle-thumb {
  transform: translateX(22px);
}

/* Layout */

main {
  min-height: calc(100vh - 72px);
}

.section {
  padding: 76px 0;
  border-top: 1px solid var(--line);
}

.section-head {
  margin-bottom: 28px;
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 32px;
}

.section-head p {
  max-width: 420px;
  color: var(--muted);
}

.eyebrow {
  margin-bottom: 22px;
  color: var(--muted);
  font-size: 14px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  text-wrap: balance;
}

h1 {
  max-width: 760px;
  font-size: clamp(52px, 8vw, 96px);
  font-weight: 750;
  line-height: 0.96;
  letter-spacing: -0.075em;
}

h2 {
  font-size: clamp(32px, 5vw, 54px);
  font-weight: 720;
  line-height: 1;
  letter-spacing: -0.055em;
}

/* Hero */

.hero {
  padding: 120px 0 84px;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  align-items: end;
  gap: 56px;
}

.hero-text {
  max-width: 420px;
  margin-bottom: 28px;
  color: var(--muted);
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* Buttons */

.button {
  min-height: 46px;
  padding: 0 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition:
    transform var(--transition),
    background var(--transition),
    border-color var(--transition),
    opacity var(--transition);
}

.button:hover {
  transform: translateY(-1px);
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.65;
  transform: none;
}

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

.button-secondary {
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--card) 70%, transparent);
  color: var(--text);
}

.button-secondary:hover {
  background: var(--card);
}

/* Cards / Projects */

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.card {
  min-height: 230px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--card) 72%, transparent);
  transition:
    transform var(--transition),
    border-color var(--transition),
    background var(--transition);
}

.card:hover {
  transform: translateY(-3px);
  background: var(--card);
  border-color: color-mix(in srgb, var(--text) 18%, var(--line));
}

.card-number {
  color: var(--muted);
  font-size: 14px;
}

.card h3 {
  margin-bottom: 10px;
  font-size: 24px;
  line-height: 1.1;
  letter-spacing: -0.035em;
}

.card p {
  color: var(--muted);
  font-size: 15px;
}

/* Contact */

.contact-layout {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 56px;
  align-items: start;
}

.contact-intro {
  max-width: 420px;
  margin-top: 18px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.65;
}

.contact-form {
  padding: 24px;
  display: grid;
  gap: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--card) 78%, transparent);
}

.contact-form label {
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  margin-bottom: 6px;
  padding: 14px 15px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text);
  outline: none;
  transition:
    border-color var(--transition),
    background var(--transition);
}

.contact-form textarea {
  min-height: 140px;
  resize: vertical;
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: var(--muted);
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: var(--text);
}

.contact-form input:invalid:not(:placeholder-shown),
.contact-form textarea:invalid:not(:placeholder-shown) {
  border-color: var(--error);
}

.contact-form input[type="email"]:invalid:not(:placeholder-shown) {
  background: color-mix(in srgb, var(--error) 8%, var(--bg));
  border-color: var(--error);
}

.form-status {
  min-height: 24px;
  color: var(--muted);
  font-size: 14px;
}

.form-status.success {
  color: var(--success);
}

.form-status.error {
  color: var(--error);
}

.honeypot {
  display: none;
}

/* Footer */

footer {
  padding: 34px 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-links {
  display: inline-flex;
  gap: 8px;
}

.footer-links a {
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--text);
}

/* Tic Tac Toe */

.game-page {
  padding: 92px 0;
}

.game-intro {
  margin-bottom: 42px;
}

.ttt-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 18px;
  align-items: start;
}

.ttt-panel,
.ttt-score {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: color-mix(in srgb, var(--card) 78%, transparent);
}

.ttt-top {
  margin-bottom: 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.ttt-label {
  margin-bottom: 2px;
  color: var(--muted);
  font-size: 14px;
}

.ttt-player {
  font-size: 34px;
  font-weight: 750;
  line-height: 1;
  letter-spacing: -0.05em;
}

.ttt-controls {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 12px;
}

.ttt-mode {
  padding: 4px;
  display: inline-flex;
  gap: 4px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: color-mix(in srgb, var(--card) 60%, transparent);
}

.ttt-mode-option {
  min-height: 38px;
  padding: 0 14px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition:
    background var(--transition),
    color var(--transition),
    transform var(--transition);
}

.ttt-mode-option:hover {
  color: var(--text);
}

.ttt-mode-option.active {
  background: var(--accent);
  color: var(--bg);
}

.ttt-board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.ttt-cell {
  aspect-ratio: 1;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
  font-size: clamp(42px, 9vw, 76px);
  font-weight: 760;
  letter-spacing: -0.08em;
  transition:
    transform 0.16s ease,
    background 0.16s ease,
    border-color 0.16s ease,
    opacity 0.16s ease;
}

.ttt-cell:hover:not(:disabled) {
  transform: translateY(-2px);
  background: color-mix(in srgb, var(--card) 70%, var(--bg));
  border-color: color-mix(in srgb, var(--text) 24%, var(--line));
}

.ttt-cell:disabled {
  cursor: default;
}

.ttt-cell.winner {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}

.ttt-status {
  min-height: 24px;
  margin-top: 18px;
  color: var(--muted);
  font-size: 15px;
}

.score-row {
  padding: 18px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
}

.score-row span {
  color: var(--text);
  font-weight: 600;
}

.score-row strong {
  color: var(--text);
  font-size: 24px;
}

.score-reset {
  width: 100%;
  margin-top: 22px;
}

/* Memory */

.memory-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 18px;
  align-items: start;
}

.memory-panel,
.memory-score {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: color-mix(in srgb, var(--card) 78%, transparent);
}

.memory-top {
  margin-bottom: 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.memory-label {
  margin-bottom: 2px;
  color: var(--muted);
  font-size: 14px;
}

.memory-status {
  color: var(--text);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.memory-board {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.memory-card {
  aspect-ratio: 1;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
  font-size: clamp(28px, 6vw, 48px);
  font-weight: 760;
  transition:
    transform 0.16s ease,
    background 0.16s ease,
    border-color 0.16s ease,
    opacity 0.16s ease;
}

.memory-card:hover:not(:disabled) {
  transform: translateY(-2px);
  background: color-mix(in srgb, var(--card) 70%, var(--bg));
  border-color: color-mix(in srgb, var(--text) 24%, var(--line));
}

.memory-card:disabled {
  cursor: default;
}

.memory-card.is-open,
.memory-card.is-matched {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}

.memory-card.is-matched {
  opacity: 0.78;
}

/* Responsive */

@media (max-width: 820px) {
  .container {
    width: min(100% - 28px, 1080px);
  }

  .site-nav,
  nav {
    min-height: 66px;
  }

  .nav-links {
    gap: 12px;
  }

  .nav-links a {
    display: none;
  }

  .hero {
    padding: 86px 0 64px;
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .section {
    padding: 58px 0;
  }

  .section-head {
    display: block;
  }

  .section-head p {
    margin-top: 16px;
  }

  .grid,
  .contact-layout,
  .ttt-layout,
  .memory-layout {
    grid-template-columns: 1fr;
  }

  .contact-layout {
    gap: 24px;
  }

  .game-page {
    padding: 64px 0;
  }

  .ttt-panel,
  .ttt-score,
  .memory-panel,
  .memory-score {
    padding: 18px;
    border-radius: 26px;
  }

  .ttt-cell,
  .memory-card {
    border-radius: 18px;
  }
}

@media (max-width: 620px) {
  .ttt-top {
    align-items: flex-start;
    flex-direction: column;
  }

  .ttt-controls {
    width: 100%;
    justify-content: space-between;
  }

  .ttt-mode {
    width: 100%;
  }

  .ttt-mode-option {
    flex: 1;
  }

  .ttt-controls .button {
    width: 100%;
  }
}