@import url("https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;600;700&family=Noto+Sans+KR:wght@400;500;700&display=swap");

:root {
  --bg-a: #06101a;
  --bg-b: #102a43;
  --panel: rgba(255, 255, 255, 0.9);
  --panel-line: rgba(7, 23, 40, 0.12);
  --ink: #0d1b2a;
  --muted: #4a5a6a;
  --accent: #007f5f;
  --accent-2: #f77f00;
  --error: #bc2c1a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Space Grotesk", "Noto Sans KR", sans-serif;
  color: var(--ink);
  background: radial-gradient(1000px 700px at 10% 10%, #174d7f 0%, transparent 55%),
    radial-gradient(900px 600px at 90% 15%, #4f772d 0%, transparent 50%),
    linear-gradient(145deg, var(--bg-a), var(--bg-b));
  position: relative;
  overflow-x: hidden;
}

.bg-orb {
  position: fixed;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  filter: blur(56px);
  opacity: 0.32;
  pointer-events: none;
}

.bg-orb-1 {
  top: -80px;
  left: -90px;
  background: #f48c06;
}

.bg-orb-2 {
  bottom: -100px;
  right: -70px;
  background: #2a9d8f;
}

.layout {
  width: min(1200px, 94vw);
  margin: 2rem auto;
  display: grid;
  grid-template-columns: minmax(320px, 420px) 1fr;
  gap: 1rem;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-line);
  border-radius: 20px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.18);
  backdrop-filter: blur(8px);
}

.controls {
  padding: 1.3rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

h1 {
  margin: 0 0 0.25rem;
  font-size: 1.45rem;
}

h2 {
  margin: 0;
  font-size: 1rem;
}

.subtitle {
  margin: 0 0 0.5rem;
  color: var(--muted);
  font-size: 0.9rem;
}

label {
  font-size: 0.86rem;
  font-weight: 600;
}

input,
select,
textarea,
button {
  font-family: inherit;
  font-size: 0.94rem;
  border-radius: 10px;
}

input,
select,
textarea {
  border: 1px solid rgba(10, 25, 40, 0.2);
  background: rgba(255, 255, 255, 0.95);
  padding: 0.62rem 0.72rem;
  color: var(--ink);
}

textarea {
  resize: vertical;
  min-height: 180px;
  line-height: 1.4;
}

input:focus,
select:focus,
textarea:focus,
button:focus {
  outline: 2px solid rgba(0, 127, 95, 0.35);
  outline-offset: 1px;
}

.subpanel {
  margin: 0.25rem 0 0.35rem;
  border: 1px dashed rgba(8, 35, 60, 0.2);
  border-radius: 12px;
  padding: 0.65rem;
  background: rgba(255, 255, 255, 0.58);
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 500;
}

.checkbox-row input {
  transform: scale(1.1);
}

.hint {
  margin: 0.15rem 0 0.4rem;
  font-size: 0.8rem;
  color: var(--muted);
}

.button-row {
  display: grid;
  gap: 0.5rem;
}

button {
  border: none;
  padding: 0.68rem 0.8rem;
  cursor: pointer;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), #0a9396);
  transition: transform 120ms ease, filter 120ms ease;
}

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

#copyBtn {
  background: linear-gradient(135deg, #f77f00, var(--accent-2));
}

.status {
  min-height: 1.15rem;
  margin: 0.2rem 0 0;
  font-size: 0.84rem;
  color: var(--muted);
}

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

.preview {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.chart-wrap {
  position: relative;
  width: 100%;
  min-height: 360px;
}

.chart-wrap.small {
  max-width: 380px;
  min-height: 260px;
}

.subchart {
  border-top: 1px solid rgba(7, 23, 40, 0.12);
  padding-top: 0.8rem;
}

.forecast {
  border-top: 1px solid rgba(7, 23, 40, 0.12);
  padding-top: 0.8rem;
}

.forecast p {
  margin: 0.4rem 0 0.6rem;
  color: var(--muted);
  font-size: 0.86rem;
}

.forecast-row {
  display: flex;
  gap: 0.5rem;
  align-items: stretch;
}

.forecast-row input {
  flex: 1;
}

.forecast-row button {
  min-width: 110px;
}

.predict-result {
  margin: 0.65rem 0 0;
  font-size: 0.9rem;
  font-weight: 600;
  color: #0e4f2f;
}

.hidden {
  display: none !important;
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .chart-wrap {
    min-height: 300px;
  }
}