@import url('https://cdn.jsdelivr.net/gh/orioncactus/pretendard/dist/web/static/pretendard.css');

:root {
  --font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol';
  --content-max-width: 1024px;
  --border-radius: 12px;
  
  /* Light Theme */
  --c-text: #2c3e50;
  --c-text-muted: #6c757d;
  --c-bg: #f0f2f5;
  --c-bg-card: #ffffff;
  --c-border: #dee2e6;
  --c-primary: #007bff;
  --c-primary-hover: #0056b3;
  --c-primary-glow: rgba(0, 123, 255, 0.25);
  --c-primary-text: #ffffff;
  --c-icon: #868e96;
  --c-ad-label: #adb5bd;
  --c-ad-bg: #e9ecef;
  --shadow-color: 220, 3%, 15%;
}

[data-theme='dark'] {
  --c-text: #ecf0f1;
  --c-text-muted: #95a5a6;
  --c-bg: #1a202c;
  --c-bg-card: #2d3748;
  --c-border: #4a5568;
  --c-primary: #4299e1;
  --c-primary-hover: #2b6cb0;
  --c-primary-glow: rgba(66, 153, 225, 0.25);
  --c-icon: #95a5a6;
  --c-ad-label: #718096;
  --c-ad-bg: #1c2633;
  --shadow-color: 220, 40%, 2%;
}

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

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.7;
  color: var(--c-text);
  background-color: var(--c-bg);
  margin: 0;
  padding: 1rem;
  transition: background-color 0.3s, color 0.3s;
}

body::before {
    content: '';
    position: fixed;
    top: 0; left: 0;
    width: 100vw; height: 100vh;
    background-image: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADAAAAAwBAMAAAClLOS0AAAAElBMVEUAAAD8/vz8/vz8/vz8/vz8/vwhc3sVAAAABnRSTlMA+fz6/PYl3naAAAAAdUlEQVQoz2NgYGBgYHw3YGBgYBBgYGBgYGBhYGBgYGBhYGBgYDhgYGBgYGBgYDhgYGBgYGBgYBBgYGBgYGBgYBBgYGBgYGBhYGBgYGBhYGBgYGBgYDhgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYDj8AADK/w4A/w4A/w4A/w4A/w4A/w4A/w4A/w4A/w4AAAAASUVORK5CYII=');
    background-repeat: repeat;
    opacity: 0.05;
    z-index: -1;
}

h1, h2, h3, h4, h5, h6 {
  margin-top: 0;
  line-height: 1.2;
  font-weight: 700;
}

h1 { font-size: 2.5rem; text-align: center; }
h2 { font-size: 1.75rem; margin-bottom: 1.5rem; padding-bottom: 0.75rem; border-bottom: 1px solid var(--c-border); }
h3 { font-size: 1.25rem; margin-top: 1.5rem; }

a {
  color: var(--c-primary);
  text-decoration: none;
  transition: color 0.2s;
}
a:hover {
  color: var(--c-primary-hover);
  text-decoration: underline;
}

.container {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 1rem;
}

.sub {
  font-size: 1.1rem;
  color: var(--c-text-muted);
  text-align: center;
  max-width: 800px;
  margin: 0 auto 1rem auto;
}

.grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 1.5rem;
}

.card {
  background-color: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  transition: background-color 0.3s, border-color 0.3s, box-shadow 0.3s;
  box-shadow:
    0 1px 2px hsl(var(--shadow-color) / 0.1),
    0 2px 4px hsl(var(--shadow-color) / 0.1),
    0 4px 8px hsl(var(--shadow-color) / 0.1),
    0 8px 16px hsl(var(--shadow-color) / 0.1);
}

.card.full {
  grid-column: 1 / -1;
}

.row {
  margin-bottom: 1rem;
}

label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

input[type="text"],
input[type="number"] {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--c-border);
  border-radius: var(--border-radius);
  font-size: 1rem;
  background-color: var(--c-bg);
  color: var(--c-text);
  transition: border-color 0.2s, background-color 0.2s, box-shadow 0.2s;
}
input:focus {
  outline: none;
  border-color: var(--c-primary);
  box-shadow: 0 0 0 4px var(--c-primary-glow);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--c-border);
  border-radius: var(--border-radius);
  background-color: var(--c-bg-card);
  color: var(--c-text);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease-out;
  box-shadow: 0 1px 2px hsl(var(--shadow-color) / 0.1);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 3px 6px hsl(var(--shadow-color) / 0.15);
}
.btn:active {
    transform: translateY(0);
}

.btn.primary {
  background: linear-gradient(to right, var(--c-primary), color-mix(in srgb, var(--c-primary) 80%, black));
  color: var(--c-primary-text);
  border-color: transparent;
}
.btn.primary:hover {
  filter: brightness(1.1);
  box-shadow: 0 4px 12px var(--c-primary-glow);
}

.icon-btn svg {
  color: var(--c-icon);
  transition: color 0.2s;
}

.btn:hover svg, .btn.primary svg {
  color: currentColor;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.rows .item {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr auto;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 0.5rem;
}
.rows .item input {
  font-size: 0.9rem;
  padding: 0.5rem;
}
.rows .item .delete-btn {
    background: transparent; border: none; box-shadow: none;
}
.rows .item .delete-btn:hover {
    background: color-mix(in srgb, var(--c-border) 50%, transparent);
    color: #e74c3c;
}

.result-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.25rem 1rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--c-border);
}
.result-item:last-child { border-bottom: none; }

.result-item strong {
    grid-column: 1 / -1;
    font-size: 1.1rem;
}
.result-item .buy { color: #2ecc71; }
.result-item .sell { color: #e74c3c; }

.summary, .result {
  margin-bottom: 1rem;
}
.muted { color: var(--c-text-muted); }

.hint { font-size: 0.9rem; color: var(--c-text-muted); text-align: center; margin-top: 1.5rem; }


/* Header and Footer */
.nav {
    display: flex;
    gap: 1.5rem;
    align-items: center;
    justify-content: center;
    margin: 1.5rem 0;
    flex-wrap: wrap;
    font-weight: 500;
}

.footer {
    margin-top: 3rem;
    text-align: center;
    border-top: 1px solid var(--c-border);
    padding-top: 2rem;
    color: var(--c-text-muted);
}

.footer .nav {
    margin-top: 0;
}

/* Theme Switcher */
.theme-switcher {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
}

/* Responsive */
@media (max-width: 768px) {
  body { padding: 0.5rem; }
  h1 { font-size: 2rem; }
  .container { padding: 0.5rem; }
  .grid {
    grid-template-columns: 1fr;
  }
  .rows .item {
    grid-template-columns: 1fr 1fr;
  }
  .rows .item input[placeholder*="이름"] {
    grid-column: 1 / -1;
  }
  .actions {
    justify-content: center;
  }
  .nav { gap: 1rem; }
}