:root {
  --bg-main: #000000;
  --bg-surface: #0a0b0e;
  --bg-card: #111317;
  --border-color: #1e2229;
  --border-focus: #b5ff00;
  --accent-lime: #a3ff00;
  --accent-yellow-green: #c4ff00;
  --accent-glow: rgba(181, 255, 0, 0.35);
  --accent-glow-subtle: rgba(181, 255, 0, 0.12);
  --text-main: #f4f6fa;
  --text-muted: #8b949e;
  --danger: #ff3860;
  --danger-glow: rgba(255, 56, 96, 0.2);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --font-main: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: var(--font-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header & Brand Container */
.app-header {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 1rem 1.25rem;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.brand {
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}

/* Full-width Centered Hero Banner Logo */
.brand-logo {
  width: 100%;
  max-width: 380px;
  height: auto;
  max-height: 140px;
  object-fit: contain;
  display: block;
}

/* Mobile Button Grid Layout */
.header-actions {
  width: 100%;
  max-width: 420px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.65rem;
}

#btn-export {
  grid-column: span 2;
}

#btn-open-add {
  grid-column: span 2;
  width: 100%;
  padding: 0.85rem 1rem;
  font-size: 0.95rem;
  font-weight: 800;
  border-radius: var(--radius-sm);
}

@media (min-width: 769px) {
  .header-container {
    flex-direction: row;
    justify-content: space-between;
  }

  .brand {
    width: auto;
    justify-content: flex-start;
  }

  .brand-logo {
    height: 60px;
    width: auto;
  }

  .header-actions {
    width: auto;
    display: flex;
    flex-wrap: nowrap;
    gap: 0.6rem;
  }

  #btn-export, #btn-open-add {
    grid-column: auto;
    width: auto;
    padding: 0.55rem 1rem;
    font-size: 0.85rem;
  }
}

/* Main Container */
.main-container {
  max-width: 1200px;
  width: 100%;
  margin: 1.5rem auto;
  padding: 0 1rem;
  flex: 1;
}

/* SVGs & Icons */
.icon-svg {
  width: 15px;
  height: 15px;
  stroke: currentColor;
  display: inline-block;
  vertical-align: middle;
}

/* Interactive Button FX & Yellow-Green Feedback */
.interactive-fx {
  position: relative;
  overflow: hidden;
  transition: transform 0.15s cubic-bezier(0.4, 0, 0.2, 1), 
              box-shadow 0.2s ease, 
              border-color 0.2s ease, 
              background-color 0.2s ease;
  user-select: none;
}

.interactive-fx:hover {
  border-color: var(--accent-lime);
  box-shadow: 0 0 12px var(--accent-glow-subtle);
}

.interactive-fx:active {
  transform: scale(0.96);
  box-shadow: 0 0 16px var(--accent-glow);
  border-color: var(--accent-yellow-green);
}

/* Yellow-Green Click Ripple Animation */
.ripple {
  position: absolute;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-yellow-green) 10%, rgba(181, 255, 0, 0.3) 70%, transparent 100%);
  transform: scale(0);
  animation: ripple-pulse 0.45s cubic-bezier(0.25, 1, 0.5, 1);
  pointer-events: none;
}

@keyframes ripple-pulse {
  to {
    transform: scale(3.5);
    opacity: 0;
  }
}

/* Standard Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  font-family: var(--font-main);
  font-weight: 600;
  font-size: 0.85rem;
  padding: 0.55rem 1rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid transparent;
  outline: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--accent-lime);
  color: #000000;
  font-weight: 700;
  box-shadow: 0 0 14px var(--accent-glow);
}

.btn-primary:hover {
  background: var(--accent-yellow-green);
  box-shadow: 0 0 20px rgba(196, 255, 0, 0.5);
}

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

.btn-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
}

.btn-close:hover {
  color: var(--accent-lime);
}

/* Metric Cards */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  transition: border-color 0.2s ease;
}

.card:hover {
  border-color: rgba(181, 255, 0, 0.25);
}

.metric-label {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.metric-val {
  font-size: 1.9rem;
  font-weight: 800;
  font-family: var(--font-mono);
  margin: 0.4rem 0 0.2rem;
  letter-spacing: -0.02em;
}

.metric-sub {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.alert-card {
  border-color: rgba(255, 56, 96, 0.25);
}

.text-danger { color: var(--danger); }
.text-accent { color: var(--accent-lime); }

/* Controls & Filter Bar */
.controls-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.filter-tabs {
  display: flex;
  gap: 0.35rem;
  background: var(--bg-surface);
  padding: 4px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.tab-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.4rem 0.85rem;
  border-radius: 6px;
  cursor: pointer;
  font-family: var(--font-main);
}

.tab-btn.active {
  background: var(--accent-lime);
  color: #000000;
  font-weight: 700;
  box-shadow: 0 0 10px var(--accent-glow-subtle);
}

.search-box {
  position: relative;
  flex: 1;
  max-width: 320px;
}

.search-icon-svg {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 14px;
  height: 14px;
  stroke: var(--text-muted);
}

.search-box input {
  width: 100%;
  padding: 0.55rem 0.85rem 0.55rem 2.2rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-size: 0.82rem;
  outline: none;
  font-family: var(--font-main);
}

.search-box input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 10px var(--accent-glow-subtle);
}

/* Tables */
.table-card {
  padding: 0;
  overflow: hidden;
}

.table-responsive {
  width: 100%;
  overflow-x: auto;
}

.ledger-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.84rem;
}

.ledger-table th {
  background: var(--bg-surface);
  color: var(--text-muted);
  padding: 0.85rem 1rem;
  font-weight: 600;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.76rem;
  text-transform: uppercase;
}

.ledger-table td {
  padding: 1rem;
  border-bottom: 1px solid var(--border-color);
  vertical-align: middle;
}

.suki-name {
  font-weight: 700;
  color: var(--text-main);
}

.suki-phone {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* Badges */
.badge {
  display: inline-block;
  padding: 3px 8px;
  border-radius: 50px;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
}

.badge-active {
  background: rgba(163, 255, 0, 0.12);
  color: var(--accent-lime);
  border: 1px solid rgba(163, 255, 0, 0.35);
}

.badge-overdue {
  background: var(--danger-glow);
  color: var(--danger);
  border: 1px solid rgba(255, 56, 96, 0.35);
}

.badge-settled {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
}

/* Table Row Action Buttons */
.table-actions {
  display: flex;
  gap: 0.35rem;
  justify-content: flex-end;
}

.table-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.35rem 0.65rem;
  border-radius: 6px;
  font-size: 0.76rem;
  font-weight: 600;
  cursor: pointer;
}

.table-btn.remind {
  border-color: rgba(181, 255, 0, 0.4);
  color: var(--accent-lime);
}

/* Presets & Modals */
.quick-presets {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 0.45rem 0 0.85rem;
}

.btn-preset {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.4rem 0.65rem;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.82);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 1rem;
}

.modal-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 480px;
  padding: 1.5rem;
  box-shadow: 0 10px 40px rgba(0,0,0,0.8);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
}

.form-group {
  margin-bottom: 1rem;
}

.form-row {
  display: flex;
  gap: 0.75rem;
}

.form-row .form-group {
  flex: 1;
}

label {
  display: block;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

input, textarea {
  width: 100%;
  padding: 0.65rem 0.85rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-family: var(--font-main);
  font-size: 0.85rem;
  outline: none;
}

input:focus, textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 10px var(--accent-glow-subtle);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  margin-top: 1.25rem;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-lime);
  color: #000000;
  font-weight: 700;
  padding: 0.65rem 1.25rem;
  border-radius: 50px;
  font-size: 0.82rem;
  box-shadow: 0 0 20px var(--accent-glow);
  z-index: 300;
}

.hidden { display: none !important; }

@media (max-width: 768px) {
  .controls-bar { flex-direction: column; align-items: stretch; }
  .search-box { max-width: 100%; }
}