/* ==========================================================================
   Quark Ohm - Comprehensive CSS Design System
   ========================================================================== */

/* Theme Variables */
:root[data-theme="dark"] {
  --bg-main: #0b0f19;
  --bg-card: #131a2a;
  --bg-card-glass: rgba(19, 26, 42, 0.85);
  --border-color: #233148;
  --border-focus: #3b82f6;

  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --accent-primary: #38bdf8;
  --accent-primary-hover: #0284c7;
  --accent-secondary: #818cf8;
  --accent-success: #10b981;
  --accent-warning: #f59e0b;
  --accent-danger: #ef4444;

  --wire-color: #334155;
  --resistor-body: #d6c5a0;
  --resistor-border: #928362;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 20px rgba(56, 189, 248, 0.25);
}

:root[data-theme="light"] {
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-glass: rgba(255, 255, 255, 0.9);
  --border-color: #e2e8f0;
  --border-focus: #2563eb;

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;

  --accent-primary: #0284c7;
  --accent-primary-hover: #0369a1;
  --accent-secondary: #6366f1;
  --accent-success: #059669;
  --accent-warning: #d97706;
  --accent-danger: #dc2626;

  --wire-color: #cbd5e1;
  --resistor-body: #e6d7b8;
  --resistor-border: #b3a27f;

  --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.08);
  --shadow-glow: 0 0 20px rgba(2, 132, 199, 0.15);
}

/* Reset & Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  transition: background-color 0.25s ease, border-color 0.25s ease, color 0.25s ease;
}

body {
  background-color: var(--bg-main);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
  padding: 20px;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(56, 189, 248, 0.05) 0%, transparent 40%),
    radial-gradient(circle at 85% 85%, rgba(129, 140, 248, 0.05) 0%, transparent 40%);
}

.app-container {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Typography & Utilities */
.symbol {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 600;
}

.hidden {
  display: none !important;
}

/* Header & Navbar */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  background: var(--bg-card-glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  box-shadow: var(--shadow-sm);
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 14px;
}

.logo-icon {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-size: 22px;
  box-shadow: var(--shadow-glow);
}

.logo-text h1 {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.5px;
  line-height: 1.2;
}

.logo-text h1 span {
  color: var(--accent-primary);
}

.logo-text .subtitle {
  font-size: 12px;
  color: var(--text-secondary);
}

/* Controls & Preset Dropdown */
.header-controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

.preset-dropdown-wrap {
  position: relative;
}

.preset-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 280px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  box-shadow: var(--shadow-md);
  padding: 8px;
  display: none;
  flex-direction: column;
  gap: 4px;
  z-index: 100;
}

.preset-menu.show {
  display: flex;
  animation: fadeIn 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

.preset-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px;
  border: none;
  background: transparent;
  color: var(--text-primary);
  border-radius: 8px;
  cursor: pointer;
  text-align: left;
}

.preset-item:hover {
  background: rgba(56, 189, 248, 0.1);
}

.preset-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
}

.preset-icon.red { background: rgba(239, 68, 68, 0.2); color: #ef4444; }
.preset-icon.white { background: rgba(241, 245, 249, 0.2); color: #e2e8f0; }
.preset-icon.green { background: rgba(16, 185, 129, 0.2); color: #10b981; }
.preset-icon.blue { background: rgba(56, 189, 248, 0.2); color: #38bdf8; }

.preset-info {
  display: flex;
  flex-direction: column;
}

.preset-name {
  font-size: 13px;
  font-weight: 600;
}

.preset-desc {
  font-size: 11px;
  color: var(--text-secondary);
}

/* Theme Toggle Button */
.theme-toggle-btn {
  height: 42px;
  padding: 0 16px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-primary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 16px;
}

.theme-toggle-btn:hover {
  border-color: var(--accent-primary);
}

.theme-label {
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
}

:root[data-theme="dark"] .sun-icon { display: block; color: #f59e0b; }
:root[data-theme="dark"] .moon-icon { display: none; }
:root[data-theme="light"] .sun-icon { display: none; }
:root[data-theme="light"] .moon-icon { display: block; color: #6366f1; }

:root[data-theme="dark"] .sun-label { display: inline; }
:root[data-theme="dark"] .moon-label { display: none; }
:root[data-theme="light"] .sun-label { display: none; }
:root[data-theme="light"] .moon-label { display: inline; }

/* Buttons */
.btn {
  padding: 8px 16px;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--accent-primary);
  color: #ffffff;
}

.btn-primary:hover {
  background: var(--accent-primary-hover);
  box-shadow: var(--shadow-glow);
}

.btn-secondary {
  background: var(--bg-card);
  border-color: var(--border-color);
  color: var(--text-primary);
}

.btn-secondary:hover {
  border-color: var(--accent-primary);
}

.btn-danger {
  background: rgba(239, 68, 68, 0.15);
  color: var(--accent-danger);
  border-color: rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
  background: var(--accent-danger);
  color: #ffffff;
}

.btn-sm {
  padding: 5px 10px;
  font-size: 12px;
  border-radius: 8px;
}

.btn-icon-only {
  width: 32px;
  height: 32px;
  padding: 0;
  justify-content: center;
  border-radius: 8px;
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.btn-icon-only:hover {
  color: var(--text-primary);
  border-color: var(--accent-primary);
}

/* Tabs Navigation */
.mode-tabs {
  display: flex;
  gap: 10px;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 2px;
}

.tab-btn {
  padding: 12px 20px;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border-radius: 10px 10px 0 0;
  display: flex;
  align-items: center;
  gap: 8px;
  position: relative;
}

.tab-btn:hover {
  color: var(--text-primary);
}

.tab-btn.active {
  color: var(--accent-primary);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-bottom: 2px solid var(--bg-card);
  margin-bottom: -2px;
}

/* Main Cards Layout */
.tab-content {
  display: none;
}

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

.grid-layout {
  display: grid;
  grid-template-columns: 320px 1fr 340px;
  gap: 20px;
}

@media (max-width: 1100px) {
  .grid-layout {
    grid-template-columns: 1fr;
  }
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 20px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.card-header {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 12px;
}

.card-header h2 {
  font-size: 16px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-primary);
}

/* Form Controls */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 12px;
}

.form-group label {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-group label .unit {
  color: var(--accent-primary);
  font-family: 'JetBrains Mono', monospace;
}

.form-row {
  display: flex;
  gap: 12px;
}

.flex-1 { flex: 1; }

input[type="number"], .styled-select, select {
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  background: var(--bg-main);
  color: var(--text-primary);
  font-size: 14px;
  font-family: 'JetBrains Mono', monospace;
  outline: none;
}

input[type="number"]:focus, .styled-select:focus, select:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.15);
}

.input-with-stepper {
  position: relative;
}

.steppers {
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
}

.steppers button {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 10px;
  cursor: pointer;
  padding: 2px 4px;
}

.steppers button:hover {
  color: var(--accent-primary);
}

.slider-input-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

input[type="range"] {
  accent-color: var(--accent-primary);
  cursor: pointer;
}

/* Circuit Simulator SVG Card */
.circuit-card {
  align-items: center;
}

.status-badge {
  font-size: 12px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 20px;
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-success);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.status-badge.warning {
  background: rgba(239, 68, 68, 0.15);
  color: var(--accent-danger);
  border-color: rgba(239, 68, 68, 0.3);
}

.circuit-canvas-container {
  width: 100%;
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 10px;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

#circuitSvg {
  width: 100%;
  height: auto;
  max-height: 320px;
}

/* Electron Flow Animation */
.electron-path {
  animation: electronDash 1.2s linear infinite;
}

@keyframes electronDash {
  to {
    stroke-dashoffset: -20;
  }
}

/* Resistor Color Code Band Visualizer */
.color-band-display {
  width: 100%;
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.color-band-title {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
}

.resistor-graphic {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px 0;
}

.resistor-wire {
  height: 4px;
  width: 50px;
  background: var(--wire-color);
  border-radius: 2px;
}

.resistor-body-box {
  width: 180px;
  height: 44px;
  background: var(--resistor-body);
  border: 2px solid var(--resistor-border);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: space-around;
  padding: 0 16px;
  position: relative;
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.15);
}

.band-stripe {
  width: 10px;
  height: 44px;
  border-radius: 2px;
  box-shadow: 0 0 2px rgba(0,0,0,0.3);
}

.color-names-row {
  display: flex;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
}

.color-chip {
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 6px;
  border: 1px solid rgba(255,255,255,0.2);
  color: #ffffff;
  text-shadow: 0 1px 2px rgba(0,0,0,0.8);
}

/* Calculation Results Cards */
.result-hero-box {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.1), rgba(129, 140, 248, 0.05));
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: 14px;
  padding: 16px;
  text-align: center;
}

.result-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.result-value-big {
  font-size: 32px;
  font-weight: 800;
  color: var(--accent-primary);
  font-family: 'JetBrains Mono', monospace;
}

.result-formula {
  font-size: 12px;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
  margin-top: 6px;
}

/* E-Series Box */
.e-series-box {
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.e-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  font-weight: 600;
}

.e-badge {
  font-size: 10px;
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-success);
  padding: 2px 6px;
  border-radius: 4px;
}

.e-main-value {
  font-size: 26px;
  font-weight: 800;
  color: var(--accent-success);
  font-family: 'JetBrains Mono', monospace;
}

.e-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  border-top: 1px solid var(--border-color);
  padding-top: 8px;
  margin-top: 4px;
}

.metric {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.m-label {
  font-size: 10px;
  color: var(--text-muted);
}

.m-val {
  font-size: 12px;
  font-weight: 700;
  font-family: 'JetBrains Mono', monospace;
}

/* Power & Thermal Box */
.power-safety-box {
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.ps-header {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
}

.ps-grid {
  display: flex;
  justify-content: space-between;
}

.ps-item {
  display: flex;
  flex-direction: column;
}

.ps-label {
  font-size: 10px;
  color: var(--text-muted);
}

.ps-val {
  font-size: 14px;
  font-weight: 700;
  font-family: 'JetBrains Mono', monospace;
}

.ps-val.highlight {
  color: var(--accent-warning);
}

/* Progress bar */
.thermal-bar-wrap {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.thermal-bar-label {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--text-secondary);
}

.progress-track {
  width: 100%;
  height: 8px;
  background: var(--border-color);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-success), var(--accent-warning), var(--accent-danger));
  border-radius: 4px;
  transition: width 0.3s ease;
}

/* Tab 2: Universal Ohm's Law Solver */
.ohms-inputs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-top: 12px;
}

.ohms-input-card {
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.ohms-card-title {
  font-size: 13px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 6px;
}

.ohms-card-title.red { color: var(--accent-danger); }
.ohms-card-title.blue { color: var(--accent-primary); }
.ohms-card-title.yellow { color: var(--accent-warning); }
.ohms-card-title.green { color: var(--accent-success); }

.input-unit-wrap {
  display: flex;
  gap: 6px;
}

.input-unit-wrap select {
  width: 80px;
}

.ohms-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin: 16px 0;
}

.ohms-result-table-wrap {
  margin-top: 10px;
}

.ohms-result-table-wrap h3 {
  font-size: 14px;
  margin-bottom: 8px;
  color: var(--text-secondary);
}

.ohms-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.ohms-table th, .ohms-table td {
  padding: 10px 12px;
  border: 1px solid var(--border-color);
  text-align: left;
  font-family: 'JetBrains Mono', monospace;
}

.ohms-table th {
  background: var(--bg-main);
  color: var(--text-secondary);
  font-weight: 600;
}

/* Tab 3: Color Lookup */
.band-selectors-wrap {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-top: 12px;
}

.band-select-col {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.band-select-col label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
}

.color-lookup-result-box {
  margin-top: 20px;
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 20px;
  text-align: center;
}

.range-info {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 6px;
}

/* History Section */
.history-actions {
  display: flex;
  gap: 8px;
}

.history-table-wrap {
  overflow-x: auto;
}

.history-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
}

.history-table th, .history-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border-color);
  text-align: left;
  font-family: 'JetBrains Mono', monospace;
}

.history-table th {
  color: var(--text-secondary);
  font-weight: 600;
}

.empty-row td {
  text-align: center;
  color: var(--text-muted);
  padding: 20px;
  font-family: inherit;
}

/* Footer */
.app-footer {
  text-align: center;
  font-size: 12px;
  color: var(--text-muted);
  padding: 16px;
}

/* Usage hint callout (使い方の説明を強調) */
.header-desc {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: fit-content;
  max-width: 100%;
  margin: 2px auto 0;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  text-align: center;
  color: var(--text-primary);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-left: 4px solid var(--accent-primary);
  padding: 12px 22px;
  border-radius: 10px;
}

.header-desc::before {
  content: "\f0eb";
  font-family: "Font Awesome 6 Free";
  font-weight: 900;
  color: var(--accent-primary);
  font-size: 18px;
  line-height: 1.6;
  flex-shrink: 0;
}