:root {
  --bg-gradient: linear-gradient(135deg, #ffd1dc, #ffc1cc);
  --card-bg: rgba(255, 255, 255, 0.95);
  --primary: #ff5c8a;
  --primary-hover: #e94b78;
  --text: #1f1f1f;
  --muted: #6b6b6b;
  --border: color-mix(in srgb, #000 10%, transparent);

  --radius: 16px;
  --radius-sm: 12px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 12px 30px rgba(0, 0, 0, 0.12);
  --footer-color: #555;

  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
}

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

body {
  margin: 0;
  font-family:
    system-ui,
    -apple-system,
    "Segoe UI",
    Roboto,
    sans-serif;
  background: var(--bg-gradient);
  color: var(--text);
  line-height: 1.6;
}

header {
  padding: clamp(24px, 5vw, 40px) 16px 16px;
}

h1 {
  margin: 0;
  text-align: center;
  font-weight: 700;
  font-size: clamp(1.4rem, 4vw, 1.9rem);
}

.container {
  min-height: calc(100vh - var(--header-footer-height));
  max-width: 1400px;
  margin: 0 auto;

  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;

  padding: 32px;
  background: none;
  box-shadow: none;
  border-radius: 0;
}

.input-group {
  background: var(--card-bg);
  border-radius: 18px;
  padding: 24px;

  display: flex;
  flex-direction: column;
  gap: 20px;

  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
}

.input-group h3 {
  margin: 0;
  text-align: center;
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.3px;
}

.input-group form {
  display: flex;
  flex-direction: column;
  gap: 20px;
  flex: 1;
}

.input-group button {
  margin-top: auto;
}

input,
select {
  height: 40px;
}

#pentaSingleInputs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  gap: 16px 14px;
}

fieldset {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;

  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  gap: 16px 14px;

  background: rgba(255, 255, 255, 0.02);
}

fieldset > label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  text-align: center;
}

fieldset {
  background: rgba(255, 255, 255, 0.02);
  border-radius: 14px;
}

legend {
  padding: 0 10px;
  font-size: 0.75rem;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  color: var(--muted);
}

label {
  font-size: 0.8rem;
  color: var(--muted);
  text-align: center;
}

input,
select {
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  font-size: 0.95rem;
  background: #fff;

  transition:
    border-color 0.2s var(--ease),
    box-shadow 0.2s var(--ease),
    transform 0.15s var(--ease);
}

input {
  text-align: center;
}

input[type="number"] {
  -moz-appearance: textfield;
  appearance: textfield;
}

input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none; /* Chrome, Safari, Edge */
  margin: 0;
}

input:focus-visible,
select:focus-visible {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(255, 92, 138, 0.25);
}

.input-group {
  display: grid;
  grid-template-rows: auto 1fr auto;
}

button {
  align-self: center;
  padding: 12px 22px;
  border: none;
  border-radius: 14px;

  background: linear-gradient(180deg, var(--primary), var(--primary-hover));

  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;

  box-shadow: var(--shadow-sm);
  transition:
    transform 0.15s var(--ease),
    box-shadow 0.15s var(--ease),
    filter 0.15s var(--ease);
}

button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  filter: brightness(1.05);
}

button:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

output {
  display: block;
  text-align: center;
  font-weight: 600;
  font-size: 1.05rem;
  margin-top: 8px;
}

footer {
  margin: 32px 0 24px;
  padding: 0 16px;
  text-align: center;
  color: var(--footer-color);
  font-size: 0.85rem;
}

.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  transition: opacity 0.2s var(--ease);
  opacity: 0;
}

.modal.show {
  display: block;
  opacity: 1;
}

.modal-content {
  background-color: var(--card-bg);
  color: var(--text);
  margin: 10% auto;
  padding: 24px;
  border-radius: var(--radius);
  width: 90%;
  max-width: 600px;
  box-shadow: var(--shadow-md);
  font-family: system-ui, sans-serif;
  line-height: 1.5;
  transition:
    transform 0.2s var(--ease),
    box-shadow 0.2s var(--ease);
  transform: translateY(-20px);
}

.modal.show .modal-content {
  transform: translateY(0);
}

.modal .close {
  color: var(--muted);
  float: right;
  font-size: 28px;
  font-weight: bold;
  cursor: pointer;
  transition: color 0.2s var(--ease);
}

.modal .close:hover {
  color: var(--primary);
}

@media (max-width: 600px) {
  .modal-content {
    padding: 16px;
  }
}

@media (max-width: 600px) {
  fieldset {
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --card-bg: rgba(30, 30, 30, 0.95);
    --text: white;
    --muted: #a0a0a0;
    --border: color-mix(in srgb, #fff 12%, transparent);
    --footer-color: rgb(78, 76, 76);
  }

  input,
  select {
    background: #1f1f1f;
    color: var(--text);
  }
}

@media (max-width: 1100px) {
  .container {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 700px) {
  .container {
    grid-template-columns: 1fr;
    padding: 20px;
  }
}