:root {
  --bg-from: #ffd86f;
  --bg-mid: #fc6262;
  --bg-to: #7f5af0;
  --card: rgba(255, 255, 255, 0.86);
  --text: #2b2140;
  --muted: #6b5f80;
  --done: #12b76a;
  --done-dark: #0a7d48;
  --error: #f04438;
  --error-dark: #b42318;
  --go: #7f5af0;
  --go-dark: #5b3fd1;
  --random: #ff9f1c;
  --random-dark: #c46f00;
  --field: #ffffff;
  --field-border: #d9d0f0;
  --shadow: 0 20px 50px rgba(43, 33, 64, 0.25);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-from: #3a1c71;
    --bg-mid: #d76d77;
    --bg-to: #1f1147;
    --card: rgba(30, 22, 52, 0.88);
    --text: #f6f1ff;
    --muted: #c3b6e0;
    --field: #2a1f48;
    --field-border: #4d3d7a;
    --shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  padding: 24px 16px 48px;
  color: var(--text);
  font-family: ui-rounded, "SF Pro Rounded", "Nunito", "Segoe UI", system-ui, sans-serif;
  background: linear-gradient(135deg, var(--bg-from), var(--bg-mid) 50%, var(--bg-to));
  background-attachment: fixed;
  overflow-x: hidden;
}

/* Плавающие цветные пятна на фоне */
.blobs span {
  position: fixed;
  z-index: -1;
  border-radius: 50%;
  filter: blur(40px);
  opacity: 0.55;
  animation: float 14s ease-in-out infinite alternate;
}

.blobs span:nth-child(1) {
  width: 320px;
  height: 320px;
  top: -80px;
  left: -60px;
  background: #00d4ff;
}

.blobs span:nth-child(2) {
  width: 260px;
  height: 260px;
  bottom: -60px;
  right: -40px;
  background: #ff4ecd;
  animation-delay: -5s;
}

.blobs span:nth-child(3) {
  width: 200px;
  height: 200px;
  top: 40%;
  left: 55%;
  background: #b8ff4e;
  animation-delay: -9s;
}

@keyframes float {
  to {
    transform: translate(40px, 60px) scale(1.15);
  }
}

.card {
  max-width: 1080px;
  margin: 24px auto 0;
  padding: 32px 24px;
  background: var(--card);
  border-radius: 28px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
  text-align: center;
}

.title {
  margin: 0;
  font-size: clamp(28px, 6vw, 44px);
  font-weight: 900;
  letter-spacing: -0.5px;
  background: linear-gradient(90deg, var(--go), var(--error), #ff9f1c);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.subtitle {
  margin: 8px 0 28px;
  color: var(--muted);
  font-size: 18px;
}

/* Кнопки */
.btn {
  min-width: 150px;
  padding: 14px 28px;
  font: inherit;
  font-size: 20px;
  font-weight: 800;
  color: #ffffff;
  border: none;
  border-radius: 999px;
  cursor: pointer;
  transition: transform 0.15s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.15s;
}

.btn:hover {
  transform: translateY(-3px) rotate(-2deg) scale(1.05);
}

.btn:active {
  transform: translateY(3px) scale(0.97);
}

.btn:focus-visible {
  outline: 4px solid #ffd86f;
  outline-offset: 3px;
}

.btn--done {
  background: var(--done);
  box-shadow: 0 6px 0 var(--done-dark);
}

.btn--error {
  background: var(--error);
  box-shadow: 0 6px 0 var(--error-dark);
}

.btn--random {
  background: linear-gradient(90deg, var(--random), var(--bg-mid));
  box-shadow: 0 6px 0 var(--random-dark);
}

.btn--go {
  width: 100%;
  background: var(--go);
  box-shadow: 0 6px 0 var(--go-dark);
}

.btn--done:active,
.btn--error:active,
.btn--random:active,
.btn--go:active {
  box-shadow: 0 2px 0 rgba(0, 0, 0, 0.25);
}

.btn--small {
  min-width: 0;
  padding: 8px 18px;
  font-size: 15px;
  color: var(--text);
  background: var(--card);
  box-shadow: 0 4px 0 rgba(43, 33, 64, 0.2);
}

/* Демо-страница */
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  max-width: 1080px;
  margin: 0 auto;
  color: #ffffff;
  font-size: 17px;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.25);
}

.topbar form {
  margin: 0;
}

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

.demo__side {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  min-width: 0;
}

.demo__result {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  width: 100%;
}

.demo__result:empty::before {
  content: "?";
  display: grid;
  place-items: center;
  width: 100%;
  aspect-ratio: 4 / 3;
  font-size: 56px;
  font-weight: 900;
  color: var(--muted);
  border: 3px dashed var(--field-border);
  border-radius: 20px;
}

.demo__message {
  margin: 0;
  padding: 6px 18px;
  font-size: 22px;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: #ffffff;
  border-radius: 999px;
  animation: pop 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.demo__result--done .demo__message {
  background: var(--done);
}

.demo__result--error .demo__message {
  background: var(--error);
}

.demo__result--random .demo__message {
  text-transform: none;
  letter-spacing: 0;
  background: var(--random);
}

.demo__loading {
  display: grid;
  place-items: center;
  width: 100%;
  aspect-ratio: 4 / 3;
  padding: 12px;
  color: var(--muted);
  font-weight: 700;
  text-align: center;
  border: 3px dashed var(--field-border);
  border-radius: 20px;
  animation: pulse 1s ease-in-out infinite alternate;
}

@keyframes pulse {
  to {
    opacity: 0.5;
  }
}

.demo__image {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 20px;
  border: 5px solid #ffffff;
  box-shadow: var(--shadow);
  animation: pop 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) 0.05s both;
}

.demo__result--done .demo__image {
  transform: rotate(-2deg);
}

.demo__result--error .demo__image {
  transform: rotate(2deg);
}

.demo__source {
  font-size: 13px;
  color: var(--muted);
}

@keyframes pop {
  from {
    opacity: 0;
    transform: scale(0.4) rotate(-8deg);
  }
}

/* Вход */
.login {
  max-width: 420px;
  margin-top: 8vh;
}

.login__logo {
  font-size: 56px;
  animation: wiggle 2.5s ease-in-out infinite;
}

@keyframes wiggle {
  0%, 100% { transform: rotate(0); }
  25% { transform: rotate(-8deg); }
  75% { transform: rotate(8deg); }
}

.login__form {
  display: flex;
  flex-direction: column;
  gap: 16px;
  text-align: left;
}

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

.field__label {
  font-weight: 700;
}

.field__input {
  padding: 12px 16px;
  font: inherit;
  font-size: 18px;
  color: var(--text);
  background: var(--field);
  border: 2px solid var(--field-border);
  border-radius: 14px;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.field__input:focus {
  border-color: var(--go);
  box-shadow: 0 0 0 4px rgba(127, 90, 240, 0.25);
}

.alert {
  margin: 0 0 16px;
  padding: 10px 14px;
  color: #ffffff;
  background: var(--error);
  border-radius: 14px;
  font-weight: 700;
  animation: pop 0.3s ease-out;
}

@media (max-width: 860px) {
  .demo {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 560px) {
  .demo {
    grid-template-columns: 1fr;
  }

  .btn {
    width: 100%;
  }

  .btn--small {
    width: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}