:root {
  --bg: #0b0d10;
  --surface: #12151b;
  --border: #1f2430;
  --text: #e6e8eb;
  --muted: #9aa0aa;
  --accent: #7aa2ff;
}

* {
  box-sizing: border-box;
  font-family: Inter, system-ui, sans-serif;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* Layout */

.container {
  max-width: 520px;
  margin: 0 auto;
  padding: 72px 16px 40px;
  animation: fadeIn 200ms ease-out;
}

header {
  margin-bottom: 32px;
}

header h1 {
  margin: 0;
  font-size: 28px;
  letter-spacing: -0.02em;
}

header p {
  margin-top: 6px;
  font-size: 14px;
  color: var(--muted);
}

.card {
  background: linear-gradient(180deg, #141823, #0f121a);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
}

/* Inputs */

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

input {
  width: 100%;
  margin-top: 6px;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #0e1117;
  color: var(--text);
  font-size: 14px;
}

input:focus {
  outline: none;
  border-color: var(--accent);
}

button {
  margin-top: 16px;
  width: 100%;
  padding: 12px;
  border-radius: 10px;
  border: none;
  background: var(--accent);
  color: #000;
  font-weight: 600;
  cursor: pointer;
  transition: transform 120ms ease, filter 120ms ease;
}

button:hover {
  transform: translateY(-1px);
  filter: brightness(1.05);
}

/* Result */

.result {
  margin-top: 24px;
}

.result span {
  font-size: 12px;
  color: var(--muted);
}

.result-row {
  display: flex;
  gap: 8px;
  margin-top: 6px;
}

.result-row input {
  flex: 1;
}

.result-row button {
  width: auto;
  padding: 0 14px;
}

/* Footer */

footer {
  margin-top: 40px;
  text-align: center;
  font-size: 12px;
  color: var(--muted);
}

/* Modal */

.modal {
  position: fixed;
  inset: 0;
  background: rgba(11, 13, 16, 0.75);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal-box {
  background: linear-gradient(180deg, #141823, #0f121a);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px 20px;
  width: calc(100% - 32px);
  max-width: 360px;
  box-shadow:
    0 10px 30px rgba(0,0,0,0.5),
    inset 0 1px 0 rgba(255,255,255,0.03);
  animation: popupIn 180ms cubic-bezier(0.4,0,0.2,1);
}

.modal-box h2 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 600;
}

.modal-box p {
  margin: 0 0 18px;
  font-size: 13.5px;
  line-height: 1.45;
  color: var(--muted);
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
}

.modal-actions button {
  width: auto;
  padding: 9px 18px;
  border-radius: 8px;
}

/* Utils */

.hidden {
  display: none;
}

/* Animations */

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes popupIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}