* { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0f0f1a;
  --surface: #1a1a2e;
  --surface-2: #252540;
  --primary: #4ade80;
  --primary-dim: #22c55e;
  --primary-text: #0f0f1a;
  --text: #e5e7eb;
  --text-dim: #9ca3af;
  --border: #2d2d4a;
  --danger: #ef4444;
  --warning: #fbbf24;
  --accent-blue: #60a5fa;
  --accent-purple: #a78bfa;
  --modal-overlay: rgba(0, 0, 0, 0.7);
}

html[data-theme="light"] {
  --bg: #f5f5f7;
  --surface: #ffffff;
  --surface-2: #eef0f3;
  --primary: #16a34a;
  --primary-dim: #15803d;
  --primary-text: #ffffff;
  --text: #1a1a2e;
  --text-dim: #6b7280;
  --border: #d4d4d8;
  --danger: #dc2626;
  --warning: #d97706;
  --accent-blue: #2563eb;
  --accent-purple: #7c3aed;
  --modal-overlay: rgba(15, 23, 42, 0.35);
}

html, body { height: 100%; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Pretendard', 'Segoe UI', Roboto, sans-serif;
  min-height: 100vh;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
  -webkit-tap-highlight-color: transparent;
}

main {
  max-width: 480px;
  margin: 0 auto;
  padding: 1.5rem 1rem 2rem;
}

.app-header { margin-bottom: 1.25rem; }

.header-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.35rem;
}
.header-row h1 {
  flex: 1;
  text-align: center;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.header-action {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  font-family: inherit;
}
.header-action:active { background: var(--surface-2); }

.vehicle {
  color: var(--text-dim);
  font-size: 0.85rem;
  text-align: center;
}

.card {
  background: var(--surface);
  border-radius: 16px;
  padding: 1.25rem;
}

.calc-section { margin-bottom: 1rem; }

.input-group { margin-bottom: 1rem; }
.input-group label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 0.4rem;
  font-weight: 500;
}
.hint-inline { font-weight: 400; opacity: 0.7; }

.preset-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.5rem;
}

input, select {
  width: 100%;
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.75rem;
  font-size: 1rem;
  font-family: inherit;
  appearance: none;
  -webkit-appearance: none;
}
input::placeholder { color: var(--text-dim); opacity: 0.6; }
input:focus, select:focus {
  outline: none;
  border-color: var(--primary);
}
select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%23808080' d='M6 8L0 0h12z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.85rem center;
  padding-right: 2rem;
}

.amount-quickadd {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.35rem;
  margin-top: 0.5rem;
}
.amount-quickadd button {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 0.5rem 0.15rem;
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  font-family: inherit;
}
.amount-quickadd button:active { background: var(--border); }
.amount-quickadd .reset-btn {
  color: var(--text-dim);
  background: transparent;
}
.amount-quickadd .reset-btn:active { background: var(--surface-2); }

.price-quickset {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.4rem;
  margin-top: 0.5rem;
}
.price-quickset button {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 0.5rem 0.4rem;
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  font-family: inherit;
}
.price-quickset button:active { background: var(--border); }

.field-note {
  color: var(--text-dim);
  font-size: 0.72rem;
  margin-top: 0.4rem;
  line-height: 1.4;
  opacity: 0.85;
}
.field-note:empty { display: none; }

button {
  cursor: pointer;
  border: none;
  font-family: inherit;
  font-weight: 500;
}

button.primary {
  width: 100%;
  background: var(--primary);
  color: var(--primary-text);
  font-size: 1.05rem;
  font-weight: 600;
  padding: 0.9rem;
  border-radius: 12px;
  margin-top: 0.25rem;
  transition: background 0.15s;
}
button.primary:active { background: var(--primary-dim); }

button.secondary {
  background: var(--surface-2);
  color: var(--text);
  padding: 0.75rem 1rem;
  border-radius: 10px;
  font-size: 0.9rem;
  border: 1px solid var(--border);
}
button.secondary:active { background: var(--border); }

#manage-presets {
  padding: 0.75rem 1rem;
  white-space: nowrap;
}

.hint-small {
  color: var(--text-dim);
  font-size: 0.75rem;
  margin-top: 0.6rem;
  text-align: center;
  line-height: 1.5;
}

.result-section {
  display: grid;
  gap: 0.75rem;
}
.result-section.hidden { display: none; }
.hidden { display: none !important; }

.result-card {
  display: grid;
  gap: 0.9rem;
  border-left: 3px solid var(--primary);
}
.main-result { border-left-color: var(--primary); }
.main-result.is-capped { border-left-color: var(--warning); }
.soc-result { border-left-color: var(--accent-blue); }
.overflow-card { border-left-color: var(--warning); }
.reverse-card { border-left-color: var(--accent-purple); }
.reverse-section { display: grid; gap: 0.6rem; }
.reverse-section:not(:last-child) {
  padding-bottom: 0.9rem;
  border-bottom: 1px solid var(--border);
}
.reverse-target {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent-purple);
}

.card-header {
  font-size: 0.85rem;
  color: var(--text-dim);
  padding-bottom: 0.3rem;
  margin-bottom: 0.1rem;
  border-bottom: 1px solid var(--border);
}
.main-result.is-capped .card-header { color: var(--warning); }
.overflow-card .card-header { color: var(--warning); }
.reverse-card .card-header { color: var(--accent-purple); }

.result-item {
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: baseline;
  gap: 0.5rem;
}
.result-label {
  color: var(--text-dim);
  font-size: 0.9rem;
}
.result-value {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}
.main-result .result-value { color: var(--primary); }
.main-result.is-capped .result-value { color: var(--warning); }
.soc-result .result-value { color: var(--accent-blue); }
.reverse-card .result-value { color: var(--accent-purple); }
.warning-text { color: var(--warning) !important; }

.result-unit {
  color: var(--text-dim);
  font-size: 0.9rem;
  min-width: 2rem;
  text-align: left;
}

footer {
  margin-top: 1rem;
  text-align: center;
}
.text-btn {
  background: transparent;
  color: var(--text-dim);
  text-decoration: underline;
  font-size: 0.85rem;
  padding: 0.5rem;
}

.modal {
  position: fixed;
  inset: 0;
  background: var(--modal-overlay);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  z-index: 100;
  animation: fadeIn 0.2s;
}
.modal.hidden { display: none !important; }

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.modal-content {
  background: var(--surface);
  width: 100%;
  max-width: 480px;
  max-height: 85vh;
  border-radius: 20px 20px 0 0;
  padding: 1.5rem 1rem calc(1rem + env(safe-area-inset-bottom, 0px));
  overflow-y: auto;
  animation: slideUp 0.25s;
}
@keyframes slideUp { from { transform: translateY(100%); } to { transform: translateY(0); } }

.modal-content header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}
.modal-content h2 {
  font-size: 1.15rem;
  font-weight: 600;
}
.close {
  background: transparent;
  color: var(--text);
  font-size: 1.75rem;
  width: 2rem;
  height: 2rem;
  line-height: 1;
  border-radius: 50%;
}

.modal-subheader {
  font-size: 1rem;
  font-weight: 600;
  margin-top: 1.5rem;
  margin-bottom: 0.6rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}
.preset-form .modal-subheader:first-child {
  margin-top: 0.5rem;
  padding-top: 0;
  border-top: none;
}

#preset-list {
  list-style: none;
  margin-bottom: 1rem;
}
#preset-list:empty::before {
  content: "저장된 프리셋이 없습니다";
  display: block;
  color: var(--text-dim);
  font-size: 0.9rem;
  text-align: center;
  padding: 1rem 0;
}
#preset-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.6rem;
  padding: 0.75rem;
  background: var(--surface-2);
  border-radius: 10px;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}
#preset-list li .preset-info { flex: 1; min-width: 0; }
#preset-list li .preset-name {
  font-weight: 600;
  display: block;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
#preset-list li .preset-detail {
  color: var(--text-dim);
  font-size: 0.78rem;
  line-height: 1.3;
}

.preset-actions {
  display: flex;
  gap: 0.35rem;
  flex-shrink: 0;
}
.preset-actions button {
  padding: 0.4rem 0.55rem;
  border-radius: 6px;
  font-size: 0.82rem;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
}
.preset-actions .del-btn {
  background: transparent;
  color: var(--danger);
  border-color: transparent;
}
.preset-actions button:active { background: var(--border); }

.preset-form { display: grid; gap: 0.5rem; }
.preset-form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}
.preset-form-actions {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem;
  margin-top: 0.25rem;
}
.preset-form-actions:has(.secondary:not(.hidden)) {
  grid-template-columns: auto 1fr;
}

.backup-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  margin-top: 0.5rem;
}