/* ============================================
   財務計算機 — Design System
   BA II Plus Professional 模擬器
   ============================================ */

/* --- Google Fonts Import --- */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+TC:wght@300;400;500;700;900&family=JetBrains+Mono:wght@300;400;500;700&family=Orbitron:wght@400;500;700;900&display=swap');

/* --- CSS Custom Properties --- */
:root {
  /* Colors - Dark Theme */
  --bg-primary: #0a0e17;
  --bg-secondary: #0d1117;
  --bg-card: #161b22;
  --bg-card-hover: #1c2333;
  --border-color: #21262d;
  --border-light: #30363d;

  /* Calculator Body */
  --calc-body-top: #1a1a2e;
  --calc-body-bottom: #0f0f23;
  --calc-body-border: #2a2a4a;

  /* LCD Screen */
  --lcd-bg: #0c1a12;
  --lcd-text: #00ff88;
  --lcd-text-dim: #00995533;
  --lcd-border: #1a3a25;
  --lcd-glow: rgba(0, 255, 136, 0.15);

  /* Button Colors */
  --btn-number: #2d3436;
  --btn-number-hover: #3d4a50;
  --btn-number-text: #e8e8e8;
  --btn-function: #1e3a5f;
  --btn-function-hover: #264d7a;
  --btn-function-text: #7ec8e3;
  --btn-tvm: #e94560;
  --btn-tvm-hover: #ff5a75;
  --btn-tvm-text: #ffffff;
  --btn-operation: #1a1a2e;
  --btn-operation-hover: #2a2a4e;
  --btn-operation-text: #a0a0c0;
  --btn-special: #2d4a22;
  --btn-special-hover: #3d6a32;
  --btn-2nd: #e6a817;
  --btn-2nd-hover: #ffc428;
  --btn-enter: #3a6b35;
  --btn-enter-hover: #4a8b45;

  /* Accent Colors */
  --accent-primary: #00b4d8;
  --accent-secondary: #e94560;
  --accent-success: #00ff88;
  --accent-warning: #ffa726;
  --accent-info: #7c4dff;

  /* Text */
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-tertiary: #6e7681;
  --text-heading: #f0f6fc;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 20px rgba(0, 180, 216, 0.2);

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-round: 50%;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-slow: 0.4s ease;

  /* Typography */
  --font-sans: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Consolas', monospace;
  --font-lcd: 'Orbitron', 'JetBrains Mono', monospace;
}

/* --- Reset & Base --- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
}

/* Background Pattern */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(0, 180, 216, 0.05) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(233, 69, 96, 0.05) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(124, 77, 255, 0.03) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

/* --- Header --- */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 14, 23, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  padding: var(--space-md) var(--space-lg);
}

.header-content {
  max-width: 1600px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.header-icon {
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-info));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  box-shadow: 0 0 15px rgba(0, 180, 216, 0.3);
}

.header-title {
  font-size: 1.25rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--text-heading), var(--accent-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 0.5px;
}

.header-subtitle {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  font-weight: 400;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.header-btn {
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.header-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

/* --- Main Layout --- */
.app-main {
  position: relative;
  z-index: 1;
  max-width: 1600px;
  margin: 0 auto;
  padding: var(--space-lg);
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: var(--space-lg);
  min-height: calc(100vh - 80px);
}

/* ============================================
   LEFT PANEL: Calculator
   ============================================ */
.calculator-panel {
  position: sticky;
  top: 100px;
  align-self: start;
}

.calculator-body {
  background: linear-gradient(180deg, var(--calc-body-top) 0%, var(--calc-body-bottom) 100%);
  border: 1px solid var(--calc-body-border);
  border-radius: var(--radius-xl);
  padding: var(--space-lg) var(--space-md) var(--space-md);
  box-shadow:
    var(--shadow-lg),
    inset 0 1px 0 rgba(255,255,255,0.05);
  position: relative;
  overflow: hidden;
}

.calculator-body::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
}

/* Calculator Badge */
.calc-badge {
  text-align: center;
  margin-bottom: var(--space-md);
}

.calc-badge-title {
  font-family: var(--font-lcd);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 2px;
}

.calc-badge-sub {
  font-size: 0.65rem;
  color: var(--text-tertiary);
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-top: 2px;
}

/* --- LCD Screen --- */
.lcd-container {
  background: var(--lcd-bg);
  border: 2px solid var(--lcd-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-bottom: var(--space-md);
  position: relative;
  overflow: hidden;
  box-shadow:
    inset 0 2px 8px rgba(0,0,0,0.5),
    0 0 15px var(--lcd-glow);
}

.lcd-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(180deg,
    rgba(0, 255, 136, 0.02) 0%,
    transparent 50%,
    rgba(0, 255, 136, 0.01) 100%);
  pointer-events: none;
}

/* Scanline effect */
.lcd-container::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, 0.08) 2px,
    rgba(0, 0, 0, 0.08) 4px
  );
  pointer-events: none;
}

.lcd-status-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--lcd-text);
  opacity: 0.6;
}

.lcd-status-item {
  padding: 1px 4px;
  border-radius: 2px;
  transition: opacity var(--transition-fast);
}

.lcd-status-item.active {
  opacity: 1;
  background: rgba(0, 255, 136, 0.1);
}

.lcd-status-item.inactive {
  opacity: 0.2;
}

.lcd-input-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--lcd-text);
  opacity: 0.5;
  margin-bottom: 2px;
  min-height: 14px;
}

.lcd-display {
  font-family: var(--font-lcd);
  font-size: 2.2rem;
  color: var(--lcd-text);
  text-align: right;
  text-shadow: 0 0 10px rgba(0, 255, 136, 0.5);
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  word-break: break-all;
  line-height: 1.1;
  position: relative;
  z-index: 1;
}

.lcd-memory-indicator {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--lcd-text);
  opacity: 0.4;
  text-align: right;
  margin-top: 2px;
  min-height: 12px;
}

/* --- Calculator Keypad --- */
.keypad {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.key-row {
  display: grid;
  gap: 5px;
}

.key-row.row-5 {
  grid-template-columns: repeat(5, 1fr);
}

.key-row.row-4 {
  grid-template-columns: repeat(4, 1fr) 1fr;
}

.key-row.row-4-equal {
  grid-template-columns: repeat(4, 1fr);
}

.key-row.row-5-last {
  grid-template-columns: repeat(3, 1fr) 1fr 1fr;
}

/* --- Calculator Key Base --- */
.calc-key {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
  -webkit-user-select: none;
  outline: none;
  overflow: visible;
}

.calc-key:active {
  transform: scale(0.93);
}

.calc-key .key-2nd-label {
  position: absolute;
  top: -1px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.5rem;
  font-weight: 400;
  white-space: nowrap;
  opacity: 0.7;
  pointer-events: none;
}

.calc-key .key-label {
  font-size: 0.78rem;
  line-height: 1.2;
  text-align: center;
}

/* Key Types */
.calc-key.key-num {
  background: linear-gradient(180deg, #3a3f47 0%, var(--btn-number) 100%);
  color: var(--btn-number-text);
  box-shadow: 0 2px 4px rgba(0,0,0,0.3), inset 0 1px 0 rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.05);
}
.calc-key.key-num:hover {
  background: linear-gradient(180deg, #4a4f57 0%, var(--btn-number-hover) 100%);
}

.calc-key.key-func {
  background: linear-gradient(180deg, #264d7a 0%, var(--btn-function) 100%);
  color: var(--btn-function-text);
  box-shadow: 0 2px 4px rgba(0,0,0,0.3), inset 0 1px 0 rgba(126, 200, 227, 0.1);
  border: 1px solid rgba(126, 200, 227, 0.15);
}
.calc-key.key-func:hover {
  background: linear-gradient(180deg, #2e5d8a 0%, var(--btn-function-hover) 100%);
}

.calc-key.key-tvm {
  background: linear-gradient(180deg, #ff5a75 0%, var(--btn-tvm) 100%);
  color: var(--btn-tvm-text);
  box-shadow: 0 2px 4px rgba(233, 69, 96, 0.3), inset 0 1px 0 rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.1);
  font-weight: 700;
}
.calc-key.key-tvm:hover {
  background: linear-gradient(180deg, #ff6a85 0%, var(--btn-tvm-hover) 100%);
  box-shadow: 0 4px 12px rgba(233, 69, 96, 0.4), inset 0 1px 0 rgba(255,255,255,0.15);
}

.calc-key.key-op {
  background: linear-gradient(180deg, #2a2a4e 0%, var(--btn-operation) 100%);
  color: var(--btn-operation-text);
  box-shadow: 0 2px 4px rgba(0,0,0,0.3), inset 0 1px 0 rgba(160, 160, 192, 0.05);
  border: 1px solid rgba(160, 160, 192, 0.1);
}
.calc-key.key-op:hover {
  background: linear-gradient(180deg, #3a3a5e 0%, var(--btn-operation-hover) 100%);
}

.calc-key.key-2nd-btn {
  background: linear-gradient(180deg, #ffc428 0%, var(--btn-2nd) 100%);
  color: #1a1a2e;
  box-shadow: 0 2px 4px rgba(230, 168, 23, 0.3), inset 0 1px 0 rgba(255,255,255,0.2);
  border: 1px solid rgba(255,255,255,0.15);
  font-weight: 700;
}
.calc-key.key-2nd-btn:hover {
  background: linear-gradient(180deg, #ffd048 0%, var(--btn-2nd-hover) 100%);
}
.calc-key.key-2nd-btn.active {
  background: linear-gradient(180deg, #ff8c00 0%, #e67700 100%);
  box-shadow: 0 0 15px rgba(255, 140, 0, 0.5);
}

.calc-key.key-enter {
  background: linear-gradient(180deg, #4a8b45 0%, var(--btn-enter) 100%);
  color: #ffffff;
  box-shadow: 0 2px 4px rgba(58, 107, 53, 0.3), inset 0 1px 0 rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.08);
}
.calc-key.key-enter:hover {
  background: linear-gradient(180deg, #5a9b55 0%, var(--btn-enter-hover) 100%);
}

.calc-key.key-cpt {
  background: linear-gradient(180deg, #5a2d82 0%, #4a1d72 100%);
  color: #d4a0ff;
  box-shadow: 0 2px 4px rgba(90, 45, 130, 0.3), inset 0 1px 0 rgba(212, 160, 255, 0.1);
  border: 1px solid rgba(212, 160, 255, 0.15);
  font-weight: 700;
}
.calc-key.key-cpt:hover {
  background: linear-gradient(180deg, #6a3d92 0%, #5a2d82 100%);
}

.calc-key.key-equal {
  background: linear-gradient(180deg, var(--accent-primary), #0090b0);
  color: #ffffff;
  font-size: 1.2rem;
  font-weight: 700;
  grid-row: span 2;
  box-shadow: 0 2px 6px rgba(0, 180, 216, 0.3);
  border: 1px solid rgba(255,255,255,0.1);
}
.calc-key.key-equal:hover {
  background: linear-gradient(180deg, #10c4e8, var(--accent-primary));
  box-shadow: 0 4px 15px rgba(0, 180, 216, 0.5);
}

.calc-key .key-2nd-label {
  color: var(--btn-2nd);
}

/* ============================================
   RIGHT PANEL: Worksheet
   ============================================ */
.worksheet-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

/* Tab Navigation */
.worksheet-tabs {
  display: flex;
  gap: 4px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 4px;
  overflow-x: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border-light) transparent;
}

.worksheet-tabs::-webkit-scrollbar {
  height: 4px;
}

.worksheet-tabs::-webkit-scrollbar-thumb {
  background: var(--border-light);
  border-radius: 2px;
}

.tab-btn {
  padding: var(--space-sm) var(--space-md);
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

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

.tab-btn.active {
  background: var(--accent-primary);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(0, 180, 216, 0.3);
}

.tab-btn .tab-icon {
  font-size: 1rem;
}

/* Worksheet Card */
.worksheet-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.worksheet-header {
  padding: var(--space-lg);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.worksheet-title-area {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.worksheet-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  background: linear-gradient(135deg, rgba(0, 180, 216, 0.15), rgba(124, 77, 255, 0.15));
  border: 1px solid rgba(0, 180, 216, 0.2);
}

.worksheet-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-heading);
}

.worksheet-desc {
  font-size: 0.78rem;
  color: var(--text-tertiary);
  margin-top: 2px;
}

.worksheet-actions {
  display: flex;
  gap: var(--space-sm);
}

.ws-action-btn {
  padding: var(--space-sm) var(--space-md);
  background: rgba(0, 180, 216, 0.1);
  border: 1px solid rgba(0, 180, 216, 0.2);
  border-radius: var(--radius-sm);
  color: var(--accent-primary);
  font-family: var(--font-sans);
  font-size: 0.75rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.ws-action-btn:hover {
  background: rgba(0, 180, 216, 0.2);
  border-color: var(--accent-primary);
}

.ws-action-btn.export-pdf {
  background: rgba(233, 69, 96, 0.1);
  border-color: rgba(233, 69, 96, 0.2);
  color: var(--accent-secondary);
}
.ws-action-btn.export-pdf:hover {
  background: rgba(233, 69, 96, 0.2);
  border-color: var(--accent-secondary);
}

.ws-action-btn.export-excel {
  background: rgba(0, 255, 136, 0.1);
  border-color: rgba(0, 255, 136, 0.2);
  color: var(--accent-success);
}
.ws-action-btn.export-excel:hover {
  background: rgba(0, 255, 136, 0.2);
  border-color: var(--accent-success);
}

/* Worksheet Body */
.worksheet-body {
  padding: var(--space-lg);
}

/* Form Elements */
.ws-form-group {
  margin-bottom: var(--space-md);
}

.ws-form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.ws-field {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.ws-field label {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.ws-field label .field-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 1px 6px;
  background: rgba(0, 180, 216, 0.15);
  color: var(--accent-primary);
  border-radius: 3px;
  font-size: 0.65rem;
  font-weight: 700;
  font-family: var(--font-mono);
}

.ws-field input,
.ws-field select {
  padding: 10px 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
  outline: none;
}

.ws-field input:focus,
.ws-field select:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(0, 180, 216, 0.1);
}

.ws-field input::placeholder {
  color: var(--text-tertiary);
  font-family: var(--font-sans);
  font-size: 0.8rem;
}

.ws-field .field-hint {
  font-size: 0.7rem;
  color: var(--text-tertiary);
}

/* Toggle Group */
.ws-toggle-group {
  display: flex;
  gap: 4px;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  padding: 3px;
  border: 1px solid var(--border-color);
}

.ws-toggle-btn {
  padding: 6px 14px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.78rem;
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--transition-fast);
  flex: 1;
  text-align: center;
}

.ws-toggle-btn.active {
  background: var(--accent-primary);
  color: #ffffff;
  box-shadow: 0 2px 6px rgba(0, 180, 216, 0.3);
}

.ws-toggle-btn:hover:not(.active) {
  background: var(--bg-card-hover);
}

/* Calculate Button */
.ws-calculate-btn {
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-info));
  border: none;
  border-radius: var(--radius-md);
  color: #ffffff;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  margin-top: var(--space-md);
  box-shadow: 0 4px 15px rgba(0, 180, 216, 0.3);
}

.ws-calculate-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 180, 216, 0.4);
}

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

.ws-clear-btn {
  width: 100%;
  padding: 10px;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  margin-top: var(--space-sm);
}

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

/* Result Display */
.ws-result {
  margin-top: var(--space-lg);
  padding: var(--space-lg);
  background: linear-gradient(135deg, rgba(0, 255, 136, 0.05), rgba(0, 180, 216, 0.05));
  border: 1px solid rgba(0, 255, 136, 0.15);
  border-radius: var(--radius-md);
  display: none;
}

.ws-result.visible {
  display: block;
  animation: fadeSlideUp 0.4s ease;
}

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

.ws-result-title {
  font-size: 0.85rem;
  color: var(--accent-success);
  font-weight: 600;
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.ws-result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-md);
}

.ws-result-item {
  padding: var(--space-md);
  background: rgba(0, 0, 0, 0.2);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255,255,255,0.03);
}

.ws-result-label {
  font-size: 0.72rem;
  color: var(--text-tertiary);
  margin-bottom: var(--space-xs);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.ws-result-value {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--lcd-text);
  text-shadow: 0 0 8px rgba(0, 255, 136, 0.3);
}

.ws-result-value.negative {
  color: var(--accent-secondary);
  text-shadow: 0 0 8px rgba(233, 69, 96, 0.3);
}

/* Chart Container */
.ws-chart-container {
  margin-top: var(--space-lg);
  padding: var(--space-lg);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  display: none;
}

.ws-chart-container.visible {
  display: block;
  animation: fadeSlideUp 0.4s ease 0.1s both;
}

.ws-chart-title {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
  font-weight: 600;
}

.chart-wrapper {
  position: relative;
  width: 100%;
  max-height: 350px;
}

/* Amortization Table */
.ws-table-container {
  margin-top: var(--space-lg);
  overflow-x: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  display: none;
}

.ws-table-container.visible {
  display: block;
  animation: fadeSlideUp 0.4s ease 0.2s both;
}

.ws-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.ws-table thead {
  background: var(--bg-secondary);
  position: sticky;
  top: 0;
}

.ws-table th {
  padding: 10px 14px;
  text-align: right;
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 2px solid var(--border-color);
  white-space: nowrap;
}

.ws-table th:first-child {
  text-align: center;
}

.ws-table td {
  padding: 8px 14px;
  text-align: right;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
}

.ws-table td:first-child {
  text-align: center;
  color: var(--text-tertiary);
}

.ws-table tbody tr:hover {
  background: rgba(0, 180, 216, 0.05);
}

.ws-table tbody tr:nth-child(even) {
  background: rgba(255,255,255,0.01);
}

/* Cash Flow Items */
.cf-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  max-height: 300px;
  overflow-y: auto;
  padding-right: var(--space-sm);
}

.cf-item {
  display: grid;
  grid-template-columns: 60px 1fr 80px 40px;
  gap: var(--space-sm);
  align-items: center;
  padding: var(--space-sm);
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.cf-item-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-primary);
  font-weight: 600;
}

.cf-item input {
  padding: 6px 10px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  outline: none;
  transition: border-color var(--transition-fast);
}

.cf-item input:focus {
  border-color: var(--accent-primary);
}

.cf-item-freq {
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

.cf-remove-btn {
  width: 28px;
  height: 28px;
  border: none;
  background: rgba(233, 69, 96, 0.1);
  color: var(--accent-secondary);
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.8rem;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.cf-remove-btn:hover {
  background: rgba(233, 69, 96, 0.3);
}

.cf-add-btn {
  padding: 8px;
  background: rgba(0, 180, 216, 0.1);
  border: 1px dashed rgba(0, 180, 216, 0.3);
  border-radius: var(--radius-sm);
  color: var(--accent-primary);
  font-family: var(--font-sans);
  font-size: 0.82rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: center;
  margin-top: var(--space-sm);
}

.cf-add-btn:hover {
  background: rgba(0, 180, 216, 0.2);
  border-color: var(--accent-primary);
}

/* Section Divider */
.ws-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-color), transparent);
  margin: var(--space-lg) 0;
}

/* Info Tooltip */
.ws-info {
  padding: var(--space-md);
  background: rgba(124, 77, 255, 0.08);
  border: 1px solid rgba(124, 77, 255, 0.15);
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-md);
}

.ws-info strong {
  color: var(--accent-info);
}

/* Hidden worksheets */
.worksheet-content {
  display: none;
}

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

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

/* Tablet */
@media (max-width: 1200px) {
  .app-main {
    grid-template-columns: 340px 1fr;
    gap: var(--space-md);
  }

  .calc-key {
    min-height: 40px;
    font-size: 0.72rem;
  }

  .lcd-display {
    font-size: 1.9rem;
  }
}

/* Tablet Portrait */
@media (max-width: 1024px) {
  .app-main {
    grid-template-columns: 1fr;
    padding: var(--space-md);
  }

  .calculator-panel {
    position: relative;
    top: 0;
  }

  .calculator-body {
    max-width: 420px;
    margin: 0 auto;
  }

  .header-subtitle {
    display: none;
  }
}

/* Mobile */
@media (max-width: 768px) {
  :root {
    --space-lg: 16px;
    --space-xl: 24px;
  }

  .app-header {
    padding: var(--space-sm) var(--space-md);
  }

  .header-title {
    font-size: 1rem;
  }

  .header-actions {
    gap: 4px;
  }

  .header-btn span {
    display: none;
  }

  .app-main {
    padding: var(--space-sm);
    gap: var(--space-md);
  }

  .calculator-body {
    padding: var(--space-md) var(--space-sm) var(--space-sm);
    border-radius: var(--radius-lg);
    max-width: 100%;
  }

  .calc-key {
    min-height: 42px;
    font-size: 0.7rem;
    border-radius: 5px;
  }

  .calc-key .key-2nd-label {
    font-size: 0.42rem;
  }

  .lcd-display {
    font-size: 1.8rem;
    min-height: 40px;
  }

  .lcd-container {
    padding: var(--space-sm) var(--space-md);
  }

  .worksheet-tabs {
    padding: 3px;
    gap: 2px;
  }

  .tab-btn {
    padding: 6px 10px;
    font-size: 0.72rem;
  }

  .tab-btn .tab-icon {
    display: none;
  }

  .worksheet-header {
    padding: var(--space-md);
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-md);
  }

  .worksheet-actions {
    width: 100%;
    flex-wrap: wrap;
  }

  .ws-action-btn {
    flex: 1;
    justify-content: center;
  }

  .worksheet-body {
    padding: var(--space-md);
  }

  .ws-form-row {
    grid-template-columns: 1fr;
  }

  .ws-result-grid {
    grid-template-columns: 1fr 1fr;
  }

  .ws-result-value {
    font-size: 1.1rem;
  }

  .cf-item {
    grid-template-columns: 50px 1fr 60px 32px;
  }
}

/* Small Mobile */
@media (max-width: 400px) {
  .calc-key {
    min-height: 38px;
    font-size: 0.62rem;
  }

  .lcd-display {
    font-size: 1.5rem;
  }

  .key-row {
    gap: 3px;
  }

  .keypad {
    gap: 4px;
  }

  .ws-result-grid {
    grid-template-columns: 1fr;
  }

  .worksheet-tabs {
    flex-wrap: nowrap;
  }
}

/* Large Desktop */
@media (min-width: 1400px) {
  .app-main {
    grid-template-columns: 420px 1fr;
  }

  .calc-key {
    min-height: 48px;
    font-size: 0.85rem;
  }
}

/* Print Styles */
@media print {
  .app-header,
  .calculator-panel,
  .worksheet-tabs,
  .worksheet-actions,
  .ws-calculate-btn,
  .ws-clear-btn {
    display: none !important;
  }

  body {
    background: white;
    color: black;
  }

  .worksheet-card {
    border: 1px solid #ddd;
    box-shadow: none;
  }

  .ws-result {
    border-color: #ccc;
  }

  .ws-result-value {
    color: #222;
    text-shadow: none;
  }
}

/* ============================================
   Animations
   ============================================ */
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* Loading Spinner */
.loading-spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,0.2);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Toast Notification */
.toast {
  position: fixed;
  bottom: 30px;
  right: 30px;
  padding: 14px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.85rem;
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  animation: slideInRight 0.3s ease;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.toast.success {
  border-color: rgba(0, 255, 136, 0.3);
}

.toast.error {
  border-color: rgba(233, 69, 96, 0.3);
}

@keyframes slideInRight {
  from { transform: translateX(100px); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-light);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-tertiary);
}