/* ==========================================================================
   Flow Rate Calculator - App-like Responsive Design
   ========================================================================== */

/* ==========================================================================
   App Container - Full Viewport
   ========================================================================== */

/* App-specific body styles */
/* Override default body styles only when this CSS is loaded */
body {
  margin: 0;
  padding: 0;
  height: 100vh;
  height: 100dvh; /* Dynamic viewport height for mobile */
  overflow: hidden;
  display: flex;
  flex-direction: column;
  /* Safe area support for iPhone X+ */
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
  /* Prevent text selection on mobile */
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  /* Prevent tap highlight */
  -webkit-tap-highlight-color: transparent;
}

/* Header styles preserved for PWA compatibility */
.header {
  /* Let styles.css handle the header styling */
  /* PWA-specific overrides will be handled by the main styles */
}

.main {
  flex: 1;
  overflow: hidden; /* No scrolling - everything must fit */
  display: flex;
  flex-direction: column;
}

.main .container {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: clamp(0.125rem, 0.5vw, 0.5rem);
  max-width: 100%;
  margin: 0 auto;
  width: 100%;
  gap: clamp(0.125rem, 0.5vh, 0.25rem);
  justify-content: space-between;
}

/* Mobile: reduce top padding to use white space */
@media (max-width: 480px) {
  .main .container {
    padding-top: clamp(2px, 0.5vh, 4px);
  }
}

.footer {
  flex-shrink: 0;
  padding: var(--space-sm);
  padding-bottom: calc(var(--space-sm) + env(safe-area-inset-bottom));
  font-size: var(--font-size-xs);
}

/* Hide footer on mobile to save space for START button */
@media (max-width: 480px) {
  .footer {
    display: none;
  }
}

/* ==========================================================================
   Flow Rate Display (Main Result)
   ========================================================================== */

.flow-rate-display {
  text-align: center;
  background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-secondary) 100%);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-2xl);
  padding: clamp(0.5rem, 1.5vw, 1rem);
  box-shadow: var(--shadow-lg);
  flex: 0 0 auto;
}

.flow-rate-label {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.flow-rate-value {
  font-family: var(--font-family-mono);
  font-size: clamp(2.5rem, 10vw, 5rem);
  font-weight: var(--font-weight-bold);
  color: #22c55e;
  line-height: 1;
  margin-bottom: var(--space-xs);
  text-shadow: 0 2px 4px rgba(34, 197, 94, 0.3);
  transition: all var(--transition-normal);
}

.flow-rate-value.updated {
  animation: flowRateUpdate 0.6s ease;
}

@keyframes flowRateUpdate {
  0% { transform: scale(1); }
  50% { transform: scale(1.1); color: #16a34a; }
  100% { transform: scale(1); }
}

.flow-rate-unit {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* ==========================================================================
   History Table
   ========================================================================== */

.history-section {
  flex: 0 1 20vh; /* Takes up to 20% of viewport height */
  min-height: 0;
  display: flex;
  flex-direction: column;
  margin: 0;
}

.history-table-container {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: auto;
  box-shadow: var(--shadow-md);
  flex: 1;
}

.history-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-family-mono);
}

.history-table thead {
  background-color: var(--color-bg-secondary);
}

.history-table th {
  padding: var(--space-sm);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 2px solid var(--color-border);
  position: sticky;
  top: 0;
  background-color: var(--color-bg-secondary);
  z-index: 10;
}

.history-table td {
  padding: var(--space-sm);
  text-align: center;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
  font-size: var(--font-size-sm);
}

.history-row:nth-child(even) {
  background-color: var(--color-bg-tertiary);
}

.history-row:hover {
  background-color: rgba(37, 99, 235, 0.05);
  cursor: pointer;
}

.history-row.latest {
  background-color: rgba(34, 197, 94, 0.1);
  font-weight: var(--font-weight-semibold);
}

.time-cell,
.flow-rate-cell {
  font-weight: var(--font-weight-medium);
}

.flow-rate-cell {
  color: #22c55e;
  font-weight: var(--font-weight-semibold);
}

/* ==========================================================================
   Timer Display - Centered and Prominent
   ========================================================================== */

.timer-section {
  text-align: center;
  background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-secondary) 100%);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: clamp(0.75rem, 2vw, 1.5rem);
  box-shadow: var(--shadow-md);
  flex: 0 0 auto;
}

.timer-label {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.timer-display {
  font-family: var(--font-family-mono);
  font-size: clamp(2.5rem, 8vw, 4rem);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  background-color: var(--color-bg-secondary);
  border: 3px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: clamp(0.75rem, 2vw, 1.5rem) clamp(1rem, 3vw, 2rem);
  margin: 0 auto var(--space-sm);
  display: inline-block;
  min-width: min(280px, 80vw);
  transition: all var(--transition-fast);
  letter-spacing: 0.05em;
}

.timer-status {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.timer-display.running {
  border-color: #22c55e;
  background-color: rgba(34, 197, 94, 0.05);
  color: #22c55e;
  animation: timerPulse 2s infinite;
}

.timer-display.stopped {
  border-color: #f59e0b;
  background-color: rgba(245, 158, 11, 0.05);
  color: #f59e0b;
}

@keyframes timerPulse {
  0%, 100% { 
    box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.4);
  }
  50% { 
    box-shadow: 0 0 0 12px rgba(34, 197, 94, 0);
  }
}

/* ==========================================================================
   Recent Flow Rates
   ========================================================================== */

.recent-rates-section {
  flex: 0 0 auto;
  margin: 0;
}

.recent-rates-title {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
  text-align: center;
}

.recent-rates-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.recent-rate-card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-sm);
  text-align: center;
  transition: all var(--transition-fast);
}

.recent-rate-card:hover {
  background: var(--color-bg-tertiary);
  border-color: var(--color-primary);
}

.recent-rate-value {
  font-family: var(--font-family-mono);
  font-size: clamp(0.875rem, 2.5vw, 1rem);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  line-height: 1;
}

.recent-rate-label {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  margin-top: 2px;
}

/* Mobile: Make recent rates more compact */
@media (max-width: 480px) {
  .recent-rates-title {
    font-size: 0.875rem;
    margin-bottom: 8px;
  }
  
  .recent-rates-grid {
    gap: 6px;
    margin-bottom: 12px;
  }
  
  .recent-rate-card {
    padding: 6px;
  }
  
  .recent-rate-value {
    font-size: 0.75rem;
  }
  
  .recent-rate-label {
    font-size: 0.625rem;
  }
}

/* ==========================================================================
   Sample Size Selection - Compact Buttons
   ========================================================================== */

.prover-section {
  flex: 0 0 auto;
}

.prover-label {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  margin-bottom: var(--space-md);
  text-align: center;
}

.prover-selector-compact {
  display: flex;
  justify-content: center;
  gap: var(--space-xs);
  margin-bottom: var(--space-sm);
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-xl);
  padding: var(--space-xs);
  box-shadow: var(--shadow-sm);
}

.prover-btn-compact {
  flex: 1;
  min-width: 44px; /* Touch-friendly */
  min-height: 44px; /* Touch-friendly */
  padding: var(--space-sm);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  background: none;
  border: none;
  border-radius: var(--radius-lg);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  /* Prevent text selection */
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  /* Better touch feedback */
  -webkit-touch-callout: none;
}

.prover-btn-compact:hover {
  background-color: var(--color-bg-tertiary);
  color: var(--color-text);
}

.prover-btn-compact.active {
  background-color: var(--color-primary);
  color: white;
  box-shadow: var(--shadow-sm);
}

.selected-prover-display {
  text-align: center;
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-sm);
}

/* Mobile: Make buttons more compact */
@media (max-width: 480px) {
  .prover-selector-compact {
    gap: 4px;
    padding: 4px;
    margin-bottom: 8px;
  }
  
  .prover-btn-compact {
    min-width: 40px;
    min-height: 40px;
    padding: 8px;
    font-size: 1rem;
  }
  
  .selected-prover-display {
    font-size: 0.875rem;
    padding: 6px;
  }
}

/* ==========================================================================
   Single Control Button
   ========================================================================== */

.controls-section {
  text-align: center;
  flex: 0 0 auto;
  margin-top: auto; /* Always push to bottom */
}

/* MOBILE: Fixed position START button - ALWAYS VISIBLE */
@media (max-width: 768px) {
  .controls-section {
    position: fixed !important;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: min(500px, 95vw);
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
    padding: clamp(8px, 2vw, 12px);
    padding-bottom: calc(clamp(8px, 2vw, 12px) + env(safe-area-inset-bottom));
    z-index: 1000; /* Always on top */
    box-shadow: 0 -2px 8px rgba(0,0,0,0.1);
    border-radius: clamp(6px, 1.5vw, 10px) clamp(6px, 1.5vw, 10px) 0 0;
  }
  
  /* Override any conflicting styles */
  .controls-section .control-btn {
    width: 100% !important;
    max-width: none !important;
    min-height: clamp(48px, 11vw, 60px) !important; /* Responsive height */
    font-size: clamp(0.875rem, 2.5vw, 1.125rem) !important;
    font-weight: bold !important;
    margin: 0 !important;
    border-radius: clamp(6px, 1.5vw, 10px) !important;
  }
}

/* Specific button sizing for different screen sizes */
@media (min-width: 428px) and (max-width: 768px) {
  .controls-section .control-btn {
    min-height: 60px !important;
    font-size: 1.125rem !important;
  }
}

@media (min-width: 375px) and (max-width: 427px) {
  .controls-section .control-btn {
    min-height: 56px !important;
    font-size: 1rem !important;
  }
}

@media (max-width: 374px) {
  .controls-section .control-btn {
    min-height: 52px !important;
    font-size: 0.875rem !important;
  }
}

.control-btn {
  width: 100%;
  max-width: min(400px, 90vw);
  padding: clamp(1rem, 3vw, 1.5rem) clamp(1.5rem, 4vw, 2rem);
  font-size: clamp(1.25rem, 4vw, 1.5rem);
  font-weight: var(--font-weight-bold);
  border: none;
  border-radius: var(--radius-2xl);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  min-height: clamp(60px, 12vw, 80px);
  box-shadow: var(--shadow-lg);
  /* Prevent text selection */
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  /* Better touch feedback */
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
}

/* START state */
.control-btn[data-state="ready"] {
  background: linear-gradient(135deg, #22c55e 0%, #16a34a 100%);
  color: white;
  border: 3px solid #16a34a;
}

.control-btn[data-state="ready"]:hover {
  background: linear-gradient(135deg, #16a34a 0%, #15803d 100%);
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

/* STOP state */
.control-btn[data-state="running"] {
  background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
  color: white;
  border: 3px solid #b91c1c;
  animation: controlPulse 1.5s infinite;
}

.control-btn[data-state="running"]:hover {
  background: linear-gradient(135deg, #b91c1c 0%, #991b1b 100%);
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

/* STOPPED state - shows as START button */
.control-btn[data-state="stopped"] {
  background: linear-gradient(135deg, #22c55e 0%, #16a34a 100%);
  color: white;
  border: 3px solid #16a34a;
}

.control-btn[data-state="stopped"]:hover {
  background: linear-gradient(135deg, #16a34a 0%, #15803d 100%);
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

@keyframes controlPulse {
  0%, 100% { 
    box-shadow: 0 4px 6px -1px rgba(220, 38, 38, 0.3), 0 2px 4px -1px rgba(220, 38, 38, 0.2);
  }
  50% { 
    box-shadow: 0 10px 15px -3px rgba(220, 38, 38, 0.4), 0 4px 6px -2px rgba(220, 38, 38, 0.3);
  }
}


/* ==========================================================================
   Responsive Design - App-like Viewport Management
   ========================================================================== */

/* Mobile phones - standard size */
@media (max-width: 480px) and (min-height: 600px) {
  .history-section {
    flex: 0 1 18vh;
  }
}

/* Mobile phones - compact mode */
@media (max-width: 480px) {
  .main .container {
    padding: clamp(2px, 1vw, 8px);
    gap: clamp(2px, 1vh, 6px);
  }
  
  /* Ensure all interactive elements prevent selection on mobile */
  * {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
  }
  
  .flow-rate-display {
    padding: clamp(4px, 1vh, 8px);
    margin-bottom: clamp(2px, 0.5vh, 4px);
  }
  
  .flow-rate-label {
    font-size: clamp(0.75rem, 3vw, 1rem);
    margin-bottom: clamp(2px, 0.5vh, 4px);
  }
  
  .flow-rate-value {
    font-size: clamp(1.5rem, 10vw, 2.5rem);
  }
  
  .history-section {
    flex: 0 1 15vh; /* Reduce from 20vh to 15vh on mobile */
  }
  
  .history-table th,
  .history-table td {
    padding: clamp(1px, 0.5vh, 3px);
    font-size: clamp(0.5rem, 2vw, 0.75rem);
  }
  
  .timer-section {
    padding: clamp(2px, 0.5vh, 4px);
  }
  
  .timer-label {
    font-size: clamp(0.625rem, 2.5vw, 0.75rem);
    margin-bottom: clamp(1px, 0.25vh, 2px);
  }
  
  .timer-display {
    font-size: clamp(1rem, 5vw, 1.25rem);
    padding: clamp(2px, 0.5vh, 4px);
    min-width: min(100px, 50vw);
  }
  
  .timer-status {
    font-size: clamp(0.5rem, 2vw, 0.625rem);
  }
  
  .prover-section {
    padding: clamp(1px, 0.25vh, 2px);
  }
  
  .prover-label {
    font-size: clamp(0.625rem, 2.5vw, 0.75rem);
    margin-bottom: clamp(1px, 0.25vh, 2px);
  }
  
  .prover-selector {
    padding: clamp(1px, 0.25vh, 2px);
    gap: clamp(1px, 0.25vh, 2px);
    margin-bottom: clamp(1px, 0.25vh, 2px);
  }
  
  .prover-btn {
    padding: clamp(1px, 0.25vh, 3px) clamp(3px, 0.75vw, 6px);
    font-size: clamp(0.5rem, 2vw, 0.625rem);
    min-width: 35px;
  }
  
  .selected-prover-display {
    padding: clamp(2px, 0.5vh, 3px);
    font-size: clamp(0.625rem, 2.5vw, 0.75rem);
  }
  
  .control-btn {
    min-height: clamp(44px, 8vh, 48px);
    font-size: clamp(0.875rem, 4vw, 1rem);
    padding: clamp(6px, 1vh, 8px) clamp(12px, 3vw, 16px);
    margin-top: auto; /* Push to bottom */
  }
}

/* Small devices (landscape phones, 576px and up) */
@media (min-width: 481px) and (max-width: 767px) {
  .history-section {
    max-height: 28vh;
  }
}

/* Medium devices (tablets, 768px and up) */
@media (min-width: 768px) and (max-width: 991px) {
  .history-section {
    max-height: 35vh;
  }
  
  .main .container {
    max-width: 600px;
  }
}

/* Large devices (desktops, 992px and up) */
@media (min-width: 992px) {
  .main .container {
    max-width: 700px;
  }
  
  .history-section {
    max-height: 40vh;
  }
}

/* CRITICAL: Mobile viewport - balance touch-friendly + START button visible */
@media (max-width: 480px) and (max-height: 750px) {
  .main .container {
    gap: 4px;
    padding: 4px;
  }
  
  /* Make Flow Rate smaller to save space */
  .flow-rate-display {
    padding: 6px;
    margin-bottom: 2px;
  }
  
  .flow-rate-value {
    font-size: clamp(1.5rem, 8vw, 2rem) !important; /* Smaller than default */
  }
  
  .flow-rate-label {
    font-size: 0.875rem;
    margin-bottom: 2px;
  }
  
  /* Ultra minimal history - just header + 1 row */
  .history-section {
    flex: 0 1 auto; /* Let it shrink as needed */
    max-height: 80px; /* Hard limit */
  }
  
  .history-table {
    font-size: 0.625rem;
  }
  
  .history-table th,
  .history-table td {
    padding: 1px 2px;
    font-size: 0.5rem;
    line-height: 1.2;
  }
  
  .history-table th {
    padding: 2px;
  }
  
  /* Show only 1 history row to save maximum space */
  .history-table tbody tr:nth-child(2),
  .history-table tbody tr:nth-child(3),
  .history-table tbody tr:nth-child(4),
  .history-table tbody tr:nth-child(5) {
    display: none;
  }
  
  /* Compact but touch-friendly timer */
  .timer-section {
    padding: 4px;
  }
  
  .timer-display {
    font-size: clamp(1rem, 5vw, 1.25rem);
    padding: 4px 8px;
    min-width: 100px;
  }
  
  .timer-label {
    font-size: 0.75rem;
    margin-bottom: 2px;
  }
  
  .timer-status {
    font-size: 0.625rem;
  }
  
  /* Touch-friendly prover buttons */
  .prover-section {
    padding: 4px;
  }
  
  .prover-label {
    font-size: 0.75rem;
    margin-bottom: 4px;
  }
  
  .prover-btn {
    padding: 8px 12px; /* Touch-friendly size */
    font-size: 0.75rem;
    min-width: 44px; /* Apple's minimum touch target */
    min-height: 36px;
  }
  
  .selected-prover-display {
    padding: 6px;
    font-size: 0.875rem;
  }
  
  /* Guaranteed visible START button */
  .control-btn {
    min-height: 48px !important; /* Touch-friendly */
    font-size: 1rem;
    padding: 12px 16px;
    margin-top: 8px;
  }
}

/* MOBILE: Responsive layout for all mobile screen sizes */
@media (max-width: 768px) {
  /* Always hide history on mobile - it's not essential for operation */
  .history-section {
    display: none !important;
  }
  
  /* Base mobile container */
  .main .container {
    max-width: min(500px, 95vw);
    margin: 0 auto;
    gap: clamp(4px, 1.5vh, 8px);
    padding: clamp(4px, 1vh, 8px) clamp(8px, 2vw, 12px) 65px;
  }
  
  /* Responsive Flow Rate display */
  .flow-rate-display {
    padding: clamp(12px, 3vh, 20px);
    margin-bottom: 0;
  }
  
  .flow-rate-value {
    font-size: clamp(2rem, 8vw, 4rem) !important;
  }
  
  .flow-rate-label {
    font-size: clamp(1rem, 3vw, 1.25rem);
  }
  
  .flow-rate-unit {
    font-size: clamp(1rem, 3vw, 1.5rem);
  }
  
  /* Responsive timer */
  .timer-section {
    padding: clamp(8px, 2vh, 16px);
  }
  
  .timer-label {
    font-size: clamp(0.875rem, 2.5vw, 1.125rem);
  }
  
  .timer-display {
    font-size: clamp(1.25rem, 4vw, 2rem);
    padding: clamp(8px, 2vh, 16px) clamp(12px, 3vw, 20px);
    min-width: clamp(120px, 30vw, 200px);
  }
  
  .timer-status {
    font-size: clamp(0.75rem, 2vw, 1rem);
  }
  
  /* Responsive recent rates */
  .recent-rates-title {
    font-size: clamp(0.875rem, 2.5vw, 1.125rem);
    margin-bottom: clamp(8px, 2vh, 12px);
  }
  
  .recent-rates-grid {
    gap: clamp(6px, 1.5vw, 12px);
    margin-bottom: clamp(12px, 3vh, 20px);
  }
  
  .recent-rate-card {
    padding: clamp(6px, 2vh, 12px);
  }
  
  .recent-rate-value {
    font-size: clamp(0.75rem, 2.2vw, 1rem);
  }
  
  .recent-rate-label {
    font-size: clamp(0.625rem, 1.8vw, 0.875rem);
  }
  
  /* Responsive sample size section */
  .prover-section {
    padding: clamp(8px, 2vh, 16px);
  }
  
  .prover-label {
    font-size: clamp(1rem, 3vw, 1.25rem);
    margin-bottom: clamp(8px, 2vh, 12px);
  }
  
  .prover-selector-compact {
    gap: clamp(4px, 1vw, 8px);
    padding: clamp(4px, 1vh, 8px);
    margin-bottom: clamp(8px, 2vh, 12px);
  }
  
  .prover-btn-compact {
    min-width: clamp(40px, 10vw, 60px);
    min-height: clamp(40px, 10vw, 60px);
    padding: clamp(8px, 2vw, 12px);
    font-size: clamp(1rem, 3vw, 1.25rem);
  }
  
  .selected-prover-display {
    font-size: clamp(0.875rem, 2.5vw, 1.125rem);
    padding: clamp(6px, 1.5vh, 10px);
  }
}

/* Large mobile phones (iPhone 12 Pro Max, etc.) */
@media (min-width: 428px) and (max-width: 768px) {
  .main .container {
    max-width: 420px;
    gap: clamp(12px, 3vh, 20px);
  }
  
  .flow-rate-value {
    font-size: clamp(2.5rem, 7vw, 3.5rem) !important;
  }
  
  .timer-display {
    font-size: clamp(1.5rem, 4vw, 1.75rem);
    min-width: clamp(150px, 35vw, 180px);
  }
  
  .prover-btn-compact {
    min-width: clamp(50px, 12vw, 70px);
    min-height: clamp(50px, 12vw, 70px);
    font-size: clamp(1.125rem, 3.5vw, 1.375rem);
  }
  
  .recent-rate-card {
    padding: clamp(10px, 2.5vh, 16px);
  }
  
  .recent-rate-value {
    font-size: clamp(0.875rem, 2.5vw, 1.125rem);
  }
}

/* iPhone SE and similar standard phones (375px) */
@media (min-width: 375px) and (max-width: 427px) {
  .main .container {
    max-width: 360px;
    gap: clamp(4px, 1.5vh, 8px);
    padding: clamp(4px, 1vh, 8px) clamp(8px, 2vw, 12px) 60px;
  }
  
  .flow-rate-value {
    font-size: clamp(1.75rem, 6vw, 2.25rem) !important;
  }
  
  .flow-rate-display {
    padding: clamp(6px, 1.5vh, 12px);
  }
  
  .timer-display {
    font-size: clamp(1.125rem, 3.5vw, 1.375rem);
    padding: clamp(4px, 1vh, 8px) clamp(8px, 2vw, 12px);
    min-width: clamp(100px, 25vw, 140px);
  }
  
  .timer-section {
    padding: clamp(4px, 1vh, 8px);
  }
  
  .timer-label {
    font-size: clamp(0.75rem, 2vw, 0.875rem);
    margin-bottom: clamp(4px, 1vh, 6px);
  }
  
  .recent-rates-title {
    font-size: clamp(0.75rem, 2vw, 0.875rem);
    margin-bottom: clamp(4px, 1vh, 6px);
  }
  
  .recent-rates-grid {
    gap: clamp(3px, 0.8vw, 6px);
    margin-bottom: clamp(6px, 1.5vh, 10px);
  }
  
  .recent-rate-card {
    padding: clamp(4px, 1vh, 6px);
  }
  
  .recent-rate-value {
    font-size: clamp(0.625rem, 1.8vw, 0.75rem);
  }
  
  .recent-rate-label {
    font-size: clamp(0.5rem, 1.5vw, 0.625rem);
  }
  
  .prover-section {
    padding: clamp(2px, 0.5vh, 4px) 0;
  }
  
  .prover-label {
    font-size: clamp(0.75rem, 2vw, 0.875rem);
    margin-bottom: clamp(4px, 1vh, 6px);
  }
  
  .prover-selector-compact {
    gap: clamp(2px, 0.5vw, 4px);
    padding: clamp(2px, 0.5vh, 4px);
    margin-bottom: clamp(4px, 1vh, 6px);
  }
  
  .prover-btn-compact {
    min-width: clamp(38px, 9vw, 48px);
    min-height: clamp(38px, 9vw, 48px);
    font-size: clamp(0.75rem, 2vw, 0.875rem);
    padding: clamp(4px, 1vw, 6px);
  }
  
  .selected-prover-display {
    font-size: clamp(0.625rem, 1.8vw, 0.75rem);
    padding: clamp(3px, 0.8vh, 5px);
    margin-bottom: clamp(2px, 0.5vh, 4px);
  }
}

/* Small mobile phones */
@media (max-width: 374px) {
  .main .container {
    max-width: 320px;
    gap: clamp(8px, 2vh, 12px);
    padding: clamp(6px, 1.5vh, 10px) clamp(8px, 2vw, 12px) 80px;
  }
  
  .flow-rate-value {
    font-size: clamp(1.75rem, 9vw, 2.5rem) !important;
  }
  
  .flow-rate-display {
    padding: clamp(8px, 2vh, 12px);
  }
  
  .timer-display {
    font-size: clamp(1.125rem, 5vw, 1.375rem);
    padding: clamp(6px, 1.5vh, 10px) clamp(8px, 2vw, 12px);
    min-width: clamp(100px, 28vw, 140px);
  }
  
  .prover-btn-compact {
    min-width: clamp(38px, 9vw, 48px);
    min-height: clamp(38px, 9vw, 48px);
    font-size: clamp(0.875rem, 2.8vw, 1rem);
  }
  
  .recent-rate-card {
    padding: clamp(4px, 1vh, 8px);
  }
  
  .recent-rate-value {
    font-size: clamp(0.625rem, 2vw, 0.875rem);
  }
}

@media (max-width: 480px) and (max-height: 700px) {
  .history-section {
    flex: 0 1 10vh; /* Even more compact */
  }
  
  /* Hide last 3 history rows */
  .history-table tbody tr:nth-child(3),
  .history-table tbody tr:nth-child(4),
  .history-table tbody tr:nth-child(5) {
    display: none;
  }
}

@media (max-width: 480px) and (max-height: 650px) {
  .history-section {
    flex: 0 1 8vh; /* Minimal history space */
  }
  
  /* Show only 1 history row on very compact mobile */
  .history-table tbody tr:nth-child(2),
  .history-table tbody tr:nth-child(3),
  .history-table tbody tr:nth-child(4),
  .history-table tbody tr:nth-child(5) {
    display: none;
  }
}

/* Very small devices - ensure everything fits */
@media (max-height: 600px) {
  .main .container {
    gap: 2px;
    padding: 4px;
  }
  
  .flow-rate-display {
    padding: 4px;
  }
  
  .flow-rate-value {
    font-size: clamp(1.25rem, 6vw, 2rem);
    margin-bottom: 0;
  }
  
  .flow-rate-label {
    font-size: 0.75rem;
    margin-bottom: 2px;
  }
  
  .history-section {
    flex: 0 1 12vh;
  }
  
  .history-table th,
  .history-table td {
    padding: 2px;
    font-size: 0.625rem;
  }
  
  /* Hide last 2 history rows on small screens */
  .history-table tbody tr:nth-child(4),
  .history-table tbody tr:nth-child(5) {
    display: none;
  }
  
  .timer-section {
    padding: 4px;
  }
  
  .timer-label {
    font-size: 0.875rem;
    margin-bottom: 2px;
  }
  
  .timer-display {
    font-size: clamp(1.25rem, 5vw, 1.75rem);
    padding: 4px 8px;
    min-width: 120px;
  }
  
  .timer-status {
    font-size: 0.625rem;
  }
  
  .prover-label {
    font-size: 0.875rem;
    margin-bottom: 4px;
  }
  
  .prover-selector {
    padding: 2px;
    gap: 2px;
    margin-bottom: 4px;
  }
  
  .prover-btn {
    padding: 4px 8px;
    font-size: 0.625rem;
    min-width: 40px;
  }
  
  .selected-prover-display {
    padding: 4px;
    font-size: 0.75rem;
  }
  
  .control-btn {
    min-height: 40px;
    padding: 4px 12px;
    font-size: clamp(0.75rem, 2.5vw, 0.875rem);
  }
  
  .footer {
    padding: 2px;
    font-size: 0.5rem;
  }
}

/* Extremely small devices - ultra compact */
@media (max-height: 500px) {
  .main .container {
    gap: 1px;
    padding: 2px;
  }
  
  .flow-rate-display {
    padding: 2px;
  }
  
  .flow-rate-value {
    font-size: clamp(1rem, 5vw, 1.5rem);
    margin-bottom: 0;
  }
  
  .flow-rate-label {
    font-size: 0.625rem;
    margin-bottom: 1px;
  }
  
  .flow-rate-unit {
    font-size: 0.625rem;
  }
  
  .history-section {
    flex: 0 1 12vh;
  }
  
  /* Show only first 2 history rows on tiny screens */
  .history-table tbody tr:nth-child(3),
  .history-table tbody tr:nth-child(4),
  .history-table tbody tr:nth-child(5) {
    display: none;
  }
  
  .history-table th,
  .history-table td {
    padding: 1px 2px;
    font-size: 0.5rem;
  }
  
  .timer-section {
    padding: 2px;
  }
  
  .timer-label {
    font-size: 0.625rem;
    margin-bottom: 1px;
  }
  
  .timer-display {
    font-size: clamp(1rem, 4vw, 1.25rem);
    padding: 2px 4px;
    min-width: 80px;
  }
  
  .timer-status {
    font-size: 0.5rem;
  }
  
  .prover-label {
    font-size: 0.625rem;
    margin-bottom: 2px;
  }
  
  .prover-selector {
    padding: 1px;
    gap: 1px;
    margin-bottom: 2px;
  }
  
  .prover-btn {
    padding: 2px 4px;
    font-size: 0.5rem;
    min-width: 30px;
  }
  
  .selected-prover-display {
    padding: 2px;
    font-size: 0.625rem;
  }
  
  .control-btn {
    min-height: 32px;
    padding: 2px 8px;
    font-size: clamp(0.625rem, 2vw, 0.75rem);
  }
  
  .footer {
    display: none; /* Hide footer on extremely small screens */
  }
}

/* Landscape orientation optimization */
@media (orientation: landscape) and (max-height: 500px) {
  .main .container {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: flex-start;
    gap: 4px;
    padding: 4px;
  }
  
  .flow-rate-display {
    flex: 1;
    min-width: 200px;
    margin-right: 4px;
    padding: 4px;
  }
  
  .timer-section {
    flex: 1;
    min-width: 200px;
    padding: 4px;
  }
  
  .history-section {
    width: 100%;
    max-height: 120px;
    order: 3;
  }
  
  .prover-section {
    width: 100%;
    order: 4;
  }
  
  .controls-section {
    width: 100%;
    order: 5;
  }
  
  .control-btn {
    min-height: 36px;
    font-size: 0.875rem;
  }
  
  .history-table th,
  .history-table td {
    padding: 1px 2px;
    font-size: 0.5rem;
  }
  
  /* Show only 2 history rows in landscape tiny screens */
  .history-table tbody tr:nth-child(3),
  .history-table tbody tr:nth-child(4),
  .history-table tbody tr:nth-child(5) {
    display: none;
  }
}

/* Very small landscape mobile phones */
@media (orientation: landscape) and (max-height: 400px) {
  .main .container {
    gap: 2px;
    padding: 2px;
  }
  
  .flow-rate-display,
  .timer-section {
    min-width: 150px;
    padding: 2px;
  }
  
  .flow-rate-value {
    font-size: clamp(1rem, 4vw, 1.25rem);
  }
  
  .timer-display {
    font-size: clamp(0.875rem, 3vw, 1rem);
    padding: 2px 4px;
    min-width: 60px;
  }
  
  .prover-btn {
    padding: 1px 3px;
    font-size: 0.5rem;
    min-width: 25px;
  }
  
  .control-btn {
    min-height: 28px;
    font-size: 0.75rem;
    padding: 2px 6px;
  }
  
  .history-section {
    max-height: 80px;
  }
  
  /* Show only 1 history row in ultra-small landscape */
  .history-table tbody tr:nth-child(2),
  .history-table tbody tr:nth-child(3),
  .history-table tbody tr:nth-child(4),
  .history-table tbody tr:nth-child(5) {
    display: none;
  }
}

/* ==========================================================================
   Dark Mode Enhancements
   ========================================================================== */

/* Enhanced flow rate display for dark mode */
[data-theme="dark"] .flow-rate-display {
  background: linear-gradient(135deg, var(--color-bg-elevated) 0%, var(--color-bg-secondary) 100%);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg);
}

[data-theme="dark"] .flow-rate-value {
  color: #34d399;
  text-shadow: 0 2px 8px rgba(52, 211, 153, 0.4);
}

[data-theme="dark"] .flow-rate-label {
  color: var(--color-text-secondary);
}

[data-theme="dark"] .flow-rate-unit {
  color: var(--color-text-secondary);
}

/* Enhanced history table for dark mode */
[data-theme="dark"] .history-table-container {
  background-color: var(--color-bg-elevated);
  border-color: var(--color-border-secondary);
  box-shadow: var(--shadow-md);
}

[data-theme="dark"] .history-table thead {
  background-color: var(--color-bg-secondary);
}

[data-theme="dark"] .history-table th {
  color: var(--color-text);
  border-bottom-color: var(--color-border);
}

[data-theme="dark"] .history-table td {
  color: var(--color-text);
  border-bottom-color: var(--color-border);
}

[data-theme="dark"] .history-row:nth-child(even) {
  background-color: var(--color-bg-tertiary);
}

[data-theme="dark"] .history-row:hover {
  background-color: rgba(96, 165, 250, 0.1);
}

[data-theme="dark"] .history-row.latest {
  background-color: rgba(52, 211, 153, 0.15);
}

[data-theme="dark"] .flow-rate-cell {
  color: #34d399;
}

/* Enhanced timer section for dark mode */
[data-theme="dark"] .timer-section {
  background-color: var(--color-bg-elevated);
  border-color: var(--color-border-secondary);
  box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .timer-display {
  background-color: var(--color-bg-secondary);
  border-color: var(--color-border);
  color: var(--color-text);
}

[data-theme="dark"] .timer-display.running {
  border-color: #34d399;
  background-color: rgba(52, 211, 153, 0.1);
}

[data-theme="dark"] @keyframes timerPulse {
  0%, 100% { 
    box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.5);
  }
  50% { 
    box-shadow: 0 0 0 8px rgba(52, 211, 153, 0);
  }
}

/* Enhanced sample size dropdown for dark mode */
[data-theme="dark"] .sample-size-dropdown {
  background-color: var(--color-bg-elevated);
  border-color: var(--color-primary);
  color: var(--color-text);
  box-shadow: var(--shadow-md);
}

[data-theme="dark"] .sample-size-dropdown:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg);
}

[data-theme="dark"] .sample-size-dropdown:focus {
  box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.15);
}

/* Enhanced control buttons for dark mode */
[data-theme="dark"] .start-btn:disabled,
[data-theme="dark"] .stop-btn:disabled {
  background: var(--color-bg-tertiary);
  color: var(--color-text-muted);
  border-color: var(--color-border);
}

[data-theme="dark"] .reset-btn {
  background: linear-gradient(135deg, var(--color-bg-elevated) 0%, var(--color-bg-secondary) 100%);
  color: var(--color-text);
  border-color: var(--color-border);
}

[data-theme="dark"] .reset-btn:hover {
  background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-bg-tertiary) 100%);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg);
}

/* Enhanced action buttons for dark mode */
[data-theme="dark"] .clear-history-btn,
[data-theme="dark"] .export-history-btn {
  background-color: var(--color-bg-elevated);
  border-color: var(--color-border);
  color: var(--color-text);
}

[data-theme="dark"] .clear-history-btn:hover,
[data-theme="dark"] .export-history-btn:hover {
  background-color: var(--color-bg-secondary);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .clear-history-btn {
  color: #ff7979;
  border-color: #ff7979;
}

[data-theme="dark"] .clear-history-btn:hover {
  background-color: rgba(255, 121, 121, 0.15);
  border-color: #ff7979;
}

[data-theme="dark"] .export-history-btn {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

[data-theme="dark"] .export-history-btn:hover {
  background-color: rgba(96, 165, 250, 0.15);
  border-color: var(--color-primary);
}

/* Legacy dark mode support */
@media (prefers-color-scheme: dark) {
  .flow-rate-value {
    color: #34d399;
    text-shadow: 0 2px 4px rgba(52, 211, 153, 0.3);
  }
  
  .flow-rate-cell {
    color: #34d399;
  }
  
  .timer-display.running {
    border-color: #34d399;
    background-color: rgba(52, 211, 153, 0.05);
  }
  
  @keyframes timerPulse {
    0%, 100% { 
      box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.4);
    }
    50% { 
      box-shadow: 0 0 0 8px rgba(52, 211, 153, 0);
    }
  }
}

/* ==========================================================================
   Print Styles
   ========================================================================== */

@media print {
  .controls-section,
  .actions-section {
    display: none;
  }
  
  .flow-rate-display,
  .history-table-container {
    break-inside: avoid;
  }
}