@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;600&family=Outfit:wght@300;400;600&family=Noto+Sans+KR:wght@300;400;500;700&display=swap');

:root {
  --bg: #0b0e14;
  --sidebar-bg: #11141d;
  --card-bg: rgba(22, 26, 37, 0.7);
  --border: rgba(56, 189, 248, 0.15);
  --accent: #38bdf8;
  --accent-glow: rgba(56, 189, 248, 0.4);
  --text-main: #f1f5f9;
  --text-dim: #94a3b8;
  --danger: #f87171;
  --success: #34d399;
  --warning: #fbbf24;
  --input-bg: rgba(0, 0, 0, 0.4);
  --mono: 'IBM Plex Mono', monospace;
  --sans: 'Outfit', 'Noto Sans KR', sans-serif;
  --glow-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  --bg: #f8fafc;
  --sidebar-bg: #ffffff;
  --card-bg: rgba(255, 255, 255, 0.85);
  --border: rgba(15, 23, 42, 0.15);
  --accent: #2563eb;
  --accent-glow: rgba(37, 99, 235, 0.3);
  --text-main: #0f172a;
  --text-dim: #475569;
  --danger: #ef4444;
  --success: #10b981;
  --warning: #f59e0b;
  --input-bg: rgba(255, 255, 255, 0.9);
}

body[data-theme="light"] {
  background-image: radial-gradient(circle at 15% 50%, rgba(37, 99, 235, 0.08), transparent 25%), radial-gradient(circle at 85% 30%, rgba(16, 185, 129, 0.08), transparent 25%);
}

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

body {
  font-family: var(--sans);
  background: var(--bg);
  background-image: radial-gradient(circle at 15% 50%, rgba(56, 189, 248, 0.03), transparent 25%),
                    radial-gradient(circle at 85% 30%, rgba(52, 211, 153, 0.03), transparent 25%);
  color: var(--text-main);
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* Navigation */
.sidebar {
  width: 240px;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 24px 0;
  z-index: 20;
  box-shadow: 4px 0 24px rgba(0,0,0,0.1);
}

.logo {
  padding: 0 24px 32px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.5px;
}

.logo-box {
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, var(--accent), #2563eb);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  box-shadow: 0 0 15px var(--accent-glow);
}

.nav-links { list-style: none; }

.nav-links li {
  padding: 14px 24px;
  cursor: pointer;
  color: var(--text-dim);
  border-left: 3px solid transparent;
  transition: var(--glow-transition);
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  position: relative;
}

.nav-links li:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.02);
}

.nav-links li.active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: linear-gradient(90deg, rgba(56, 189, 248, 0.1) 0%, transparent 100%);
  font-weight: 600;
  text-shadow: 0 0 8px var(--accent-glow);
}

/* Main Content */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  scroll-behavior: smooth;
}

header {
  padding: 20px 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid rgba(255,255,255,0.05);
  background: rgba(11, 14, 20, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.tab-content {
  display: none;
  padding: 24px 32px;
  animation: fadeIn 0.4s ease-out forwards;
}

.tab-content.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.sub-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
  border-bottom: 1px solid rgba(255,255,255,0.05);
  padding-bottom: 12px;
}

.sub-tab {
  padding: 8px 16px;
  font-size: 13px;
  color: var(--text-dim);
  cursor: pointer;
  border-radius: 6px;
  transition: var(--glow-transition);
  border: 1px solid transparent;
}

.sub-tab:hover {
  color: var(--text-main);
  background: rgba(255,255,255,0.03);
}

.sub-tab.active {
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent);
  font-weight: 600;
  border-color: rgba(56, 189, 248, 0.3);
  box-shadow: inset 0 0 10px rgba(56, 189, 248, 0.1);
}

/* Timeframe Selector */
.timeframe-selector {
  display: inline-flex;
  background: rgba(0, 0, 0, 0.2);
  border-radius: 8px;
  padding: 4px;
  border: 1px solid rgba(255,255,255,0.05);
}
.tf-btn {
  padding: 6px 16px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-dim);
  background: transparent;
  border: none;
  cursor: pointer;
  border-radius: 6px;
  transition: var(--glow-transition);
}
.tf-btn.active {
  background: rgba(255,255,255,0.1);
  color: #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

/* KPI & Cards */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-bottom: 24px;
}

.kpi-card {
  background: var(--card-bg);
  backdrop-filter: blur(10px);
  padding: 24px;
  border-radius: 16px;
  border: 1px solid var(--border);
  transition: var(--glow-transition);
  position: relative;
  overflow: hidden;
}

.kpi-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; width: 100%; height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}

.kpi-card:hover {
  transform: translateY(-4px);
  border-color: rgba(56, 189, 248, 0.3);
  box-shadow: 0 10px 30px rgba(0,0,0,0.4), inset 0 0 20px rgba(56,189,248,0.05);
}

.kpi-card:hover::before { opacity: 1; }

.kpi-card .label {
  font-size: 12px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}

.kpi-card .value {
  font-size: 32px;
  font-weight: 700;
  font-family: var(--mono);
  background: linear-gradient(to right, #fff, #94a3b8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.card {
  background: var(--card-bg);
  backdrop-filter: blur(10px);
  border-radius: 16px;
  border: 1px solid var(--border);
  overflow: hidden;
  margin-bottom: 24px;
  transition: var(--glow-transition);
}

.card:hover {
  border-color: rgba(255,255,255,0.1);
  box-shadow: 0 10px 40px rgba(0,0,0,0.3);
}

.card-header {
  padding: 16px 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(0, 0, 0, 0.2);
}

.card-header h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Integrated Table */
.table-wrap {
  overflow-x: auto;
  max-height: 500px;
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

th {
  padding: 14px 24px;
  font-size: 12px;
  color: var(--text-dim);
  border-bottom: 1px solid rgba(255,255,255,0.1);
  cursor: pointer;
  position: sticky;
  top: 0;
  background: rgba(22, 26, 37, 0.95);
  backdrop-filter: blur(4px);
  z-index: 5;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: color 0.2s;
}

th:hover { color: var(--accent); }

td {
  padding: 14px 24px;
  font-size: 13px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
  font-family: var(--mono);
  white-space: nowrap;
  transition: background 0.2s;
}

tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

/* Utilities / Inputs / Buttons */
.editable-input {
  background: var(--input-bg);
  border: 1px solid var(--border);
  color: var(--accent);
  padding: 6px 12px;
  border-radius: 6px;
  font-family: var(--mono);
  transition: border-color 0.3s, box-shadow 0.3s;
}

.editable-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.2);
}

.btn-save {
  padding: 8px 20px;
  background: linear-gradient(135deg, var(--accent), #2563eb);
  color: #fff;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: var(--glow-transition);
  font-size: 13px;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-save:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(56, 189, 248, 0.4);
}

.btn-save:active {
  transform: translateY(0);
}

.tag {
  font-size: 11px;
  padding: 4px 8px;
  border-radius: 6px;
  font-weight: 600;
  font-family: var(--sans);
}

.tag.red {
  background: rgba(248, 113, 113, 0.1);
  color: var(--danger);
  border: 1px solid rgba(248, 113, 113, 0.2);
}

.tag.green {
  background: rgba(52, 211, 153, 0.1);
  color: var(--success);
  border: 1px solid rgba(52, 211, 153, 0.2);
}

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg);
}
::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.1);
  border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(255,255,255,0.2);
}

/* Insights Panel & Delta */
.insight-panel { display: flex; align-items: flex-start; gap: 16px; background: rgba(56, 189, 248, 0.05); border: 1px solid rgba(56, 189, 248, 0.2); padding: 16px 20px; border-radius: 12px; margin-bottom: 24px; box-shadow: 0 4px 20px rgba(0,0,0,0.2), inset 0 0 20px rgba(56, 189, 248, 0.03); animation: slideDown 0.4s ease-out; }
.insight-icon { font-size: 20px; text-shadow: 0 0 10px rgba(255, 255, 255, 0.5); }
.insight-text { font-size: 13px; line-height: 1.5; color: var(--text-main); }
.delta-badge { font-size: 11px; padding: 2px 6px; border-radius: 4px; margin-left: 8px; font-weight: 600; display: inline-flex; align-items: center; gap: 4px; }
.delta-up { background: rgba(248, 113, 113, 0.15); color: var(--danger); }
.delta-down { background: rgba(52, 211, 153, 0.15); color: var(--success); }
@keyframes slideDown { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }
.drill-down-active { box-shadow: 0 0 0 2px var(--accent); }
.chart-back-btn { font-size: 11px; padding: 4px 8px; margin-top: 8px; cursor: pointer; color: var(--accent); background: rgba(56,189,248,0.1); border: 1px solid rgba(56,189,248,0.3); border-radius: 4px; display: inline-block; transition: 0.2s; }
.chart-back-btn:hover { background: rgba(56,189,248,0.2); }

/* Theme Toggle & Dropdown Helpers */
.theme-switch { margin: auto 24px 10px; display:flex; align-items:center; cursor:pointer; font-size:12px; color:var(--text-dim); gap:8px; padding:8px; background:var(--card-bg); border:1px solid var(--border); border-radius:8px; transition:0.3s; }
.theme-switch:hover { color:var(--text-main); border-color:var(--accent); }

.input-with-icon { position:relative; display:inline-flex; align-items:center; }
.input-with-icon input, .input-with-icon select { padding-right: 20px; cursor: pointer; }


/* Line Balancing Planner */
.plan-hero { display:flex; gap:20px; align-items:center; padding:16px 24px; background:linear-gradient(90deg, rgba(37,99,235,0.1), transparent); border-bottom:1px solid var(--border); }
.bottleneck-bar-wrap { flex:1; height:24px; background:rgba(255,255,255,0.05); border-radius:4px; position:relative; overflow:hidden; }
.bottleneck-bar { height:100%; background:var(--success); border-radius:4px; transition:0.3s; }
.bottleneck-bar.danger { background:var(--danger); }
.bottleneck-target-line { position:absolute; top:0; bottom:0; width:2px; background:#fff; z-index:2; box-shadow:0 0 4px #000; left: 0; }

.editable-input[type="date"], .editable-input[type="week"], .editable-input[type="month"] { color-scheme: dark; }
[data-theme="light"] .editable-input { color-scheme: light; }

/* Raw Data Upload UI */
#drop-zone:hover {
  background: rgba(56, 189, 248, 0.05);
  border-color: var(--accent);
}

.bottleneck-bar-wrap { position:relative; }

#preview-table td {
  padding: 8px 12px;
  font-size: 11px;
}

#preview-table th {
  padding: 8px 12px;
  font-size: 11px;
  background: rgba(0, 0, 0, 0.5);
}

.upload-success-anim {
  animation: pulseSuccess 1s infinite alternate;
}

@keyframes pulseSuccess {
  from { box-shadow: 0 0 10px rgba(52, 211, 153, 0.2); }
  to { box-shadow: 0 0 25px rgba(52, 211, 153, 0.5); }
}