/* ==========================================================================
   ChronoCalc - Modern Android Material 3 Design System & Theme Styles
   ========================================================================== */

:root {
  /* Color Tokens - Dark Mode (Default for OLED battery saving) */
  --bg-primary: #090d16;
  --bg-surface: #111827;
  --bg-card: #192237;
  --bg-card-hover: #222f4c;
  --bg-card-elevated: #1f2b46;
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-focus: #6366f1;

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --accent-primary: #6366f1;       /* Indigo */
  --accent-primary-hover: #4f46e5;
  --accent-cyan: #06b6d4;          /* Cyan / Info */
  --accent-cyan-hover: #0891b2;
  --accent-green: #10b981;         /* Emerald / Success */
  --accent-rose: #f43f5e;          /* Rose / Danger */
  --accent-amber: #f59e0b;         /* Amber / Warning */

  --key-num-bg: #1e293b;
  --key-num-hover: #334155;
  --key-num-text: #f8fafc;
  
  --key-unit-bg: #1e1b4b;
  --key-unit-border: #4338ca;
  --key-unit-text: #a5b4fc;

  --key-op-bg: #0c4a6e;
  --key-op-border: #0284c7;
  --key-op-text: #38bdf8;

  --key-equals-bg: linear-gradient(135deg, #6366f1 0%, #3b82f6 50%, #06b6d4 100%);
  --key-equals-text: #ffffff;

  --key-clear-bg: #4c0519;
  --key-clear-border: #be123c;
  --key-clear-text: #fda4af;

  /* Elevations & Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.35);

  /* Radius & Transitions */
  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 9999px;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace, ui-monospace;

  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme Variables */
body.light-theme {
  --bg-primary: #f1f5f9;
  --bg-surface: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;
  --bg-card-elevated: #f8fafc;
  --border-subtle: rgba(0, 0, 0, 0.08);
  --border-focus: #4f46e5;

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

  --key-num-bg: #f8fafc;
  --key-num-hover: #e2e8f0;
  --key-num-text: #0f172a;

  --key-unit-bg: #e0e7ff;
  --key-unit-border: #c7d2fe;
  --key-unit-text: #3730a3;

  --key-op-bg: #e0f2fe;
  --key-op-border: #bae6fd;
  --key-op-text: #0369a1;

  --key-clear-bg: #ffe4e6;
  --key-clear-border: #fecdd3;
  --key-clear-text: #9f1239;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.08);
  --shadow-glow: 0 0 16px rgba(99, 102, 241, 0.2);
}

/* ================= Global Reset & Android Viewport ================= */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

input, select, textarea {
  user-select: text;
}

html, body {
  width: 100%;
  height: 100%;
  overflow-x: hidden;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ================= App Container ================= */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  max-width: 540px;
  margin: 0 auto;
  background-color: var(--bg-surface);
  box-shadow: 0 0 40px rgba(0, 0, 0, 0.6);
  position: relative;
  padding-bottom: calc(72px + env(safe-area-inset-bottom, 16px));
}

/* ================= Top App Header ================= */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  padding-top: calc(12px + env(safe-area-inset-top, 0px));
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-icon-wrapper {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-cyan));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.35);
}

.brand-icon {
  width: 22px;
  height: 22px;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #ffffff 40%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

body.light-theme .brand-title {
  background: linear-gradient(135deg, #0f172a 40%, var(--accent-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-subtitle {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

.icon-btn {
  background: transparent;
  border: none;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  cursor: pointer;
  position: relative;
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.icon-btn svg {
  width: 20px;
  height: 20px;
}

.icon-btn:hover, .icon-btn:active {
  background-color: var(--border-subtle);
  color: var(--text-primary);
  transform: scale(0.95);
}

.icon-btn.active {
  color: var(--accent-cyan);
}

.icon-btn .badge {
  position: absolute;
  top: 4px;
  right: 4px;
  background: var(--accent-primary);
  color: #fff;
  font-size: 0.65rem;
  font-weight: 700;
  padding: 2px 5px;
  border-radius: var(--radius-pill);
  min-width: 16px;
  text-align: center;
}

/* ================= PWA Install Banner ================= */
.pwa-banner {
  margin: 10px 14px;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(6, 182, 212, 0.15));
  border: 1px solid rgba(99, 102, 241, 0.3);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  animation: slideDown 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.banner-content {
  display: flex;
  align-items: center;
  gap: 10px;
}

.banner-icon {
  font-size: 1.6rem;
}

.banner-text {
  display: flex;
  flex-direction: column;
}

.banner-text strong {
  font-size: 0.88rem;
  color: var(--text-primary);
}

.banner-text span {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.banner-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.btn-install {
  background: var(--accent-primary);
  color: #ffffff;
  border: none;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
}

.btn-dismiss {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1rem;
  padding: 4px;
  cursor: pointer;
}

/* ================= Main Content Views ================= */
.main-content {
  flex: 1;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
}

.tab-view {
  display: none;
  flex-direction: column;
  gap: 12px;
  animation: fadeIn 0.2s ease-in-out;
}

.tab-view.active {
  display: flex;
}

/* ================= TAB 1: Time Math Calculator Styles ================= */
.calc-display-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.calc-display-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-cyan));
}

.expression-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 26px;
}

.math-expr {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--text-secondary);
  word-break: break-all;
}

.mini-copy-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
  color: var(--text-secondary);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.mini-copy-btn svg {
  width: 15px;
  height: 15px;
}

.mini-copy-btn:hover, .mini-copy-btn:active {
  background: var(--accent-primary);
  color: #fff;
  border-color: transparent;
}

.result-primary-row {
  display: flex;
  align-items: baseline;
  justify-content: flex-start;
  padding: 4px 0;
}

.result-main {
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  line-height: 1.2;
}

.result-breakdown-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 6px;
  border-top: 1px solid var(--border-subtle);
}

.tag-pill {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  display: flex;
  align-items: center;
  gap: 6px;
}

.tag-pill .tag-label {
  color: var(--text-muted);
}

.tag-pill strong {
  font-family: var(--font-mono);
  color: var(--accent-cyan);
  font-weight: 600;
}

/* Quick Presets Bar */
.quick-presets-bar {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding-bottom: 2px;
  scrollbar-width: none;
}

.quick-presets-bar::-webkit-scrollbar {
  display: none;
}

.preset-chip {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.preset-chip:hover, .preset-chip:active {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: transparent;
  transform: scale(0.96);
}

.preset-chip.chip-danger {
  color: var(--accent-rose);
  border-color: rgba(244, 63, 94, 0.3);
}

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

/* Touch Keypad */
.touch-keypad {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  margin-top: 4px;
}

.key-btn {
  height: 56px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  font-size: 1.15rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-fast), background var(--transition-fast), filter var(--transition-fast);
  touch-action: manipulation;
}

.key-btn:active {
  transform: scale(0.92);
  filter: brightness(1.2);
}

/* Keypad Specific Themes */
.key-num {
  background: var(--key-num-bg);
  color: var(--key-num-text);
}

.key-unit {
  background: var(--key-unit-bg);
  border-color: var(--key-unit-border);
  color: var(--key-unit-text);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.key-op {
  background: var(--key-op-bg);
  border-color: var(--key-op-border);
  color: var(--key-op-text);
  font-size: 1.3rem;
}

.key-clear {
  background: var(--key-clear-bg);
  border-color: var(--key-clear-border);
  color: var(--key-clear-text);
  font-weight: 800;
}

.key-fn {
  background: var(--bg-card);
  color: var(--text-secondary);
}

.key-equals {
  grid-column: span 2;
  background: var(--key-equals-bg);
  color: var(--key-equals-text);
  font-size: 1.6rem;
  font-weight: 800;
  border: none;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}

.key-back svg {
  width: 22px;
  height: 22px;
}

/* ================= Cards & General Forms ================= */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  box-shadow: var(--shadow-sm);
}

.card-title {
  font-size: 1.05rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-primary);
}

.card-title svg {
  width: 18px;
  height: 18px;
  color: var(--accent-cyan);
}

.card-subtitle {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: -8px;
  line-height: 1.3;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.input-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modern-input {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  padding: 10px 12px;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  width: 100%;
}

.modern-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.input-row {
  display: flex;
  gap: 8px;
}

.input-row .time-input {
  flex: 1.2;
}

.input-row .date-input {
  flex: 1.8;
}

.grid-2col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.grid-3col {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
}

.btn-micro {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-subtle);
  color: var(--accent-cyan);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: var(--radius-xs);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-micro:hover, .btn-micro:active {
  background: var(--accent-cyan);
  color: #fff;
}

.btn-micro-danger {
  color: var(--accent-rose);
}

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

/* Toggle Switch */
.toggle-row {
  padding-top: 4px;
}

.switch-label {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.custom-switch {
  appearance: none;
  width: 44px;
  height: 24px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-pill);
  position: relative;
  cursor: pointer;
  transition: background var(--transition-normal);
}

.custom-switch::before {
  content: '';
  position: absolute;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  top: 2px;
  left: 2px;
  background: #ffffff;
  transition: transform var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.custom-switch:checked {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
}

.custom-switch:checked::before {
  transform: translateX(20px);
}

/* Duration Divider */
.duration-divider {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: -4px 0;
}

.duration-divider .line {
  flex: 1;
  height: 1px;
  background: var(--border-subtle);
}

.duration-divider .divider-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
}

.duration-divider .divider-icon svg {
  width: 14px;
  height: 14px;
}

/* ================= Result Cards & Metrics ================= */
.result-card {
  background: linear-gradient(180deg, var(--bg-card-elevated) 0%, var(--bg-card) 100%);
  border: 1px solid rgba(99, 102, 241, 0.25);
}

.result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.highlight-result {
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.metrics-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  padding-top: 8px;
  border-top: 1px solid var(--border-subtle);
}

.metric-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: 10px;
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.metric-title {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.metric-box strong {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--accent-cyan);
  font-weight: 700;
}

/* Progress bar */
.day-progress-section {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: 4px;
}

.progress-bar-container {
  width: 100%;
  height: 8px;
  background: var(--bg-surface);
  border-radius: var(--radius-pill);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-cyan));
  border-radius: var(--radius-pill);
  transition: width 0.4s ease;
}

.progress-legend {
  display: flex;
  justify-content: space-between;
  font-size: 0.68rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ================= Work & Wage Calculator ================= */
.currency-input-wrap {
  display: flex;
  gap: 6px;
}

.currency-select {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  padding: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  outline: none;
  max-width: 80px;
}

.input-with-chips {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.chip-row {
  display: flex;
  gap: 6px;
}

.break-chip {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  flex: 1;
  text-align: center;
  transition: all var(--transition-fast);
}

.break-chip.active, .break-chip:hover {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: transparent;
}

.wage-card {
  border-color: rgba(16, 185, 129, 0.3);
}

.wage-main-display {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.wage-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.wage-amount {
  font-family: var(--font-mono);
  font-size: 2.1rem;
  font-weight: 800;
  color: var(--accent-green);
}

.wage-breakdown-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--border-subtle);
}

.wage-item {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.wage-item strong {
  font-family: var(--font-mono);
  color: var(--text-primary);
}

.wage-item.highlight {
  background: rgba(16, 185, 129, 0.08);
  padding: 6px 10px;
  border-radius: var(--radius-xs);
}

.wage-item.highlight strong {
  color: var(--accent-green);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-primary), #4338ca);
  color: #ffffff;
  border: none;
  padding: 12px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
  transition: transform var(--transition-fast), filter var(--transition-fast);
}

.btn-primary svg {
  width: 18px;
  height: 18px;
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-secondary {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 10px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  width: 100%;
  transition: all var(--transition-fast);
}

.btn-secondary:hover, .btn-secondary:active {
  background: var(--border-subtle);
}

/* Timesheet Log Card */
.timesheet-card {
  gap: 10px;
}

.timesheet-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.timesheet-header h3 {
  font-size: 0.9rem;
  color: var(--text-primary);
}

.timesheet-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 180px;
  overflow-y: auto;
}

.timesheet-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: 8px 10px;
  border-radius: var(--radius-xs);
  font-size: 0.8rem;
}

.timesheet-row-info {
  display: flex;
  flex-direction: column;
}

.timesheet-row-info strong {
  font-family: var(--font-mono);
  color: var(--text-primary);
}

.timesheet-row-info span {
  color: var(--text-muted);
  font-size: 0.72rem;
}

.timesheet-row-pay {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent-green);
}

.timesheet-footer {
  display: flex;
  justify-content: space-between;
  padding-top: 8px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.timesheet-footer strong {
  font-family: var(--font-mono);
  color: var(--text-primary);
}

/* ================= Segmented Control ================= */
.segmented-control {
  display: flex;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-pill);
  padding: 3px;
  gap: 4px;
}

.segmented-control.mini {
  border-radius: var(--radius-sm);
}

.subtab-btn {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 8px;
  border-radius: var(--radius-pill);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.segmented-control.mini .subtab-btn {
  border-radius: var(--radius-xs);
  padding: 6px;
}

.subtab-btn.active {
  background: var(--accent-primary);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}

.date-mode-panel {
  display: none;
  flex-direction: column;
  gap: 12px;
}

.date-mode-panel.active {
  display: flex;
}

/* ================= Time Converter Grid ================= */
.converter-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.conv-field {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.conv-field label {
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.conv-input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.conv-input {
  font-family: var(--font-mono);
  font-weight: 600;
  padding-right: 32px;
  font-size: 0.88rem;
}

.conv-copy-btn {
  position: absolute;
  right: 6px;
  background: transparent;
  border: none;
  font-size: 0.85rem;
  cursor: pointer;
  opacity: 0.6;
  transition: opacity var(--transition-fast);
}

.conv-copy-btn:hover {
  opacity: 1;
}

.converter-footer {
  padding-top: 4px;
}

/* ================= Bottom Navigation Bar ================= */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 540px;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-around;
  padding: 8px 12px;
  padding-bottom: calc(8px + env(safe-area-inset-bottom, 12px));
  z-index: 50;
  backdrop-filter: blur(16px);
}

.nav-item {
  background: transparent;
  border: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px 12px;
  border-radius: var(--radius-md);
  transition: color var(--transition-fast);
}

.nav-icon {
  width: 32px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill);
  transition: all var(--transition-fast);
}

.nav-icon svg {
  width: 20px;
  height: 20px;
}

.nav-label {
  font-size: 0.7rem;
  font-weight: 600;
}

.nav-item.active {
  color: var(--text-primary);
}

.nav-item.active .nav-icon {
  background: rgba(99, 102, 241, 0.2);
  color: var(--accent-primary);
  width: 48px;
}

/* ================= Modals & Bottom Sheets ================= */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(6px);
  z-index: 100;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  transition: opacity var(--transition-normal);
}

.modal-overlay.hidden {
  display: none;
  opacity: 0;
  pointer-events: none;
}

.bottom-sheet {
  background: var(--bg-surface);
  width: 100%;
  max-width: 540px;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  border-top: 1px solid var(--border-subtle);
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  padding: 12px 16px calc(16px + env(safe-area-inset-bottom, 12px));
  animation: slideUp 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.sheet-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-subtle);
}

.sheet-handle {
  width: 38px;
  height: 4px;
  background: var(--text-muted);
  border-radius: var(--radius-pill);
}

.sheet-title-row {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.sheet-title-row h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.sheet-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-btn-micro {
  background: var(--border-subtle);
  border: none;
  color: var(--text-primary);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 0.9rem;
}

.sheet-body {
  flex: 1;
  overflow-y: auto;
  padding: 12px 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.history-item-row {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.history-item-row:hover {
  background: var(--bg-card-hover);
}

.history-item-content {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.history-item-expr {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.history-item-res {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

.history-item-time {
  font-size: 0.68rem;
  color: var(--text-muted);
}

/* Standard Dialog Modal */
.modal-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 460px;
  margin: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-height: 85vh;
  overflow-y: auto;
  animation: scaleUp 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.modal-header h3 {
  font-size: 1.1rem;
  font-weight: 700;
}

.modal-body {
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.modal-body h4 {
  color: var(--text-primary);
  font-size: 0.95rem;
  margin-top: 4px;
}

.help-list {
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.help-list strong {
  color: var(--text-primary);
}

.help-list code {
  background: var(--bg-card);
  padding: 2px 5px;
  border-radius: 4px;
  font-family: var(--font-mono);
  color: var(--accent-cyan);
}

.modal-tip {
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.25);
  padding: 10px;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  color: var(--text-primary);
}

/* Toast */
.toast {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-primary);
  color: #ffffff;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-lg);
  z-index: 150;
  animation: fadeIn 0.2s ease;
  pointer-events: none;
}

.toast.hidden {
  display: none;
}

.empty-state {
  text-align: center;
  padding: 24px 16px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.hidden {
  display: none !important;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideDown {
  from { transform: translateY(-20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

@keyframes slideUp {
  from { transform: translateY(100%); }
  to { transform: translateY(0); }
}

@keyframes scaleUp {
  from { transform: scale(0.9); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}