@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@500;600;700;800&display=swap');

:root {
  --bg-dark: #090d16;
  --bg-card: rgba(18, 25, 41, 0.75);
  --bg-card-hover: rgba(26, 36, 59, 0.85);
  --bg-input: rgba(11, 16, 28, 0.8);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(99, 102, 241, 0.5);

  --accent-primary: #6366f1;
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
  --accent-cyan: #06b6d4;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --font-heading: 'Outfit', -apple-system, sans-serif;
  --font-body: 'Inter', -apple-system, sans-serif;

  --shadow-glow: 0 0 25px rgba(99, 102, 241, 0.25);
  --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
}

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

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-body);
  min-height: 100vh;
  line-height: 1.6;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(99, 102, 241, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 85% 85%, rgba(168, 85, 247, 0.1) 0%, transparent 40%);
  background-attachment: fixed;
}

/* Header & Nav */
.header-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 2rem;
  background: rgba(9, 13, 22, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-main);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.35rem;
}

.brand-badge {
  background: var(--accent-gradient);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-size: 1.5rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.btn-nav {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-nav:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--accent-primary);
}

/* Container */
.main-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* Calc Page Header */
.calc-header {
  margin-bottom: 2rem;
  text-align: left;
}

.category-tag {
  display: inline-block;
  padding: 0.35rem 0.85rem;
  background: rgba(99, 102, 241, 0.15);
  border: 1px solid rgba(99, 102, 241, 0.3);
  color: #818cf8;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: 20px;
  margin-bottom: 0.75rem;
}

.calc-title {
  font-family: var(--font-heading);
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
  background: linear-gradient(180deg, #ffffff 0%, #cbd5e1 100%);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.calc-description {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 750px;
}

/* Calculator Workspace Layout */
.calc-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 992px) {
  .calc-grid {
    grid-template-columns: 460px 1fr;
  }
}

/* Glass Panels */
.glass-panel {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-card);
  transition: border-color 0.2s ease;
}

.glass-panel:hover {
  border-color: rgba(255, 255, 255, 0.12);
}

.panel-heading {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.75rem;
}

/* Form Controls */
.form-group {
  margin-bottom: 1.35rem;
}

.form-label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.4rem;
}

.form-label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-main);
}

.form-value-badge {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  color: #818cf8;
  background: rgba(99, 102, 241, 0.1);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(99, 102, 241, 0.2);
}

.input-control {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.95rem;
  transition: all 0.2s ease;
}

.input-control:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.range-slider {
  width: 100%;
  height: 6px;
  -webkit-appearance: none;
  appearance: none;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
  outline: none;
  margin-top: 0.5rem;
}

.range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent-primary);
  cursor: pointer;
  box-shadow: 0 0 10px rgba(99, 102, 241, 0.5);
  transition: transform 0.15s ease;
}

.range-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

/* Toggle Switch / Mode Selectors */
.toggle-group {
  display: flex;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  padding: 0.25rem;
  border-radius: var(--radius-sm);
  gap: 0.25rem;
}

.toggle-btn {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 0.5rem;
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.toggle-btn.active {
  background: var(--accent-primary);
  color: #fff;
  font-weight: 600;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}

/* Metric Cards Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.metric-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.metric-card.featured {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(168, 85, 247, 0.15) 100%);
  border-color: rgba(99, 102, 241, 0.4);
}

.metric-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

.metric-value {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-main);
}

.metric-sub {
  font-size: 0.8rem;
  color: var(--accent-cyan);
}

/* Chart Container */
.chart-container {
  width: 100%;
  height: 280px;
  background: rgba(11, 16, 28, 0.5);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
  position: relative;
}

/* Table styling */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
  font-size: 0.9rem;
}

.data-table th, .data-table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.data-table th {
  color: var(--text-muted);
  font-weight: 600;
  background: rgba(255, 255, 255, 0.02);
}

/* Action Toolbar */
.action-toolbar {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.btn-action {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.2s ease;
}

.btn-action:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--accent-primary);
}

.btn-action.primary {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}

.btn-action.primary:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

/* Hub Grid (Index Page) */
.hub-search-box {
  max-width: 600px;
  margin: 0 auto 2.5rem;
  position: relative;
}

.hub-search-input {
  width: 100%;
  padding: 1rem 1.25rem 1rem 3rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 30px;
  color: var(--text-main);
  font-size: 1.05rem;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-card);
  transition: all 0.2s ease;
}

.hub-search-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-glow);
}

.hub-search-icon {
  position: absolute;
  left: 1.1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-dim);
  font-size: 1.2rem;
}

.hub-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.calc-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  text-decoration: none;
  color: var(--text-main);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
}

.calc-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--accent-gradient);
  opacity: 0;
  transition: opacity 0.25s ease;
}

.calc-card:hover {
  transform: translateY(-4px);
  border-color: rgba(99, 102, 241, 0.4);
  box-shadow: var(--shadow-glow);
}

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

.calc-card-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: rgba(99, 102, 241, 0.12);
  color: #818cf8;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  margin-bottom: 1rem;
}

.calc-card-title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.calc-card-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.calc-card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border-color);
  padding-top: 0.75rem;
}

/* Toast Notice */
.toast-notice {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: #10b981;
  color: #fff;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  box-shadow: 0 10px 25px rgba(0,0,0,0.5);
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  z-index: 999;
}

.toast-notice.show {
  transform: translateY(0);
  opacity: 1;
}