:root {
  --background: #f8f7f4;
  --text: #20201e;
  --muted: #686862;
  --hint: #74746d;
  --surface: #fff;
  --border: #d8d7d1;
  --accent: #3c6553;
  --error: #a13d32;
  --button-text: #fff;
  --button-hover: #3c6553;
  --soft-hover: #eaece6;
  --underline: #b8b8b0;
  color-scheme: light;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--background);
  font-synthesis: none;
  -webkit-font-smoothing: antialiased;
}

:root[data-theme="dark"] {
  --background: #191b19;
  --text: #eeeee8;
  --muted: #b0b4ac;
  --hint: #a5aaa1;
  --surface: #232623;
  --border: #454b43;
  --accent: #a5ceb3;
  --error: #f0a198;
  --button-text: #191b19;
  --button-hover: #a5ceb3;
  --soft-hover: #2d342d;
  --underline: #6b7669;
  color-scheme: dark;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100svh;
  padding: 24px clamp(20px, 5vw, 80px) 48px;
}

.shortener {
  width: min(100%, 720px);
  margin: clamp(56px, 12vh, 144px) auto 0;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.wordmark {
  display: inline-block;
  color: inherit;
  font-size: 23px;
  font-weight: 750;
  letter-spacing: -1px;
  text-decoration: none;
}

.wordmark span { color: var(--accent); }

h1 {
  margin: 0;
  font-size: clamp(44px, 6vw, 80px);
  line-height: 1.04;
  font-weight: 650;
  letter-spacing: -.045em;
}

.intro {
  margin: 24px 0 48px;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.5;
}

.intro a {
  color: inherit;
  text-decoration-color: var(--underline);
  text-underline-offset: 3px;
}

.intro a:hover { color: var(--accent); }

label, h2 {
  display: block;
  margin: 0 0 10px;
  font-size: 13px;
  font-weight: 600;
}

.input-row, .result-row { display: flex; gap: 10px; }

input, button {
  min-height: 56px;
  border-radius: 9px;
  font: inherit;
  font-size: 16px;
}

input {
  width: 100%;
  min-width: 0;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  padding: 0 15px;
}

input::placeholder { color: var(--hint); opacity: 1; }
input[aria-invalid="true"] { border-color: var(--error); }

button {
  flex-shrink: 0;
  border: 1px solid var(--text);
  padding: 0 19px;
  background: var(--text);
  color: var(--button-text);
  font-weight: 550;
  cursor: pointer;
  transition: background 120ms ease, border-color 120ms ease;
}

button span { margin-left: 10px; }
button:hover { background: var(--button-hover); border-color: var(--button-hover); }
button:disabled { opacity: .65; cursor: wait; }

:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; }

.hint, .error, .status {
  margin: 10px 0 0;
  font-size: 12px;
  line-height: 1.6;
}

.hint { color: var(--hint); }
.error { color: var(--error); }
.status { min-height: 20px; color: var(--accent); }

.result {
  margin-top: 30px;
  padding-top: 26px;
  border-top: 1px solid var(--border);
}

.result h2 { color: var(--accent); }
.result-row { align-items: center; }

#short-url {
  background: transparent;
  border-color: transparent;
  padding-left: 0;
  color: var(--accent);
  font-size: 17px;
  font-weight: 550;
}

.copy-button {
  min-height: 44px;
  border-color: var(--border);
  background: transparent;
  color: var(--text);
}

.copy-button:hover { background: var(--soft-hover); border-color: var(--underline); }

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  min-height: 44px;
  padding: 0;
  border-color: transparent;
  background: transparent;
  color: var(--muted);
}

.theme-toggle:hover {
  background: var(--soft-hover);
  border-color: transparent;
  color: var(--text);
}
[hidden] { display: none !important; }

@media (max-width: 600px) {
  body { padding-top: 16px; padding-bottom: 32px; }
  .shortener { margin-top: 56px; }
  h1 { font-size: clamp(40px, 10vw, 60px); }
  .input-row { flex-direction: column; }
  .input-row button { width: 100%; }
  .intro { margin: 20px 0 36px; font-size: 16px; }
  .result-row { flex-wrap: wrap; }
  #short-url { flex: 1 1 200px; }
  .copy-button { flex: 1 0 auto; }
}

@media (max-height: 500px) {
  .shortener { margin-top: 32px; }
}

@media (prefers-reduced-motion: reduce) {
  button { transition: none; }
}