/* Reset and Base Styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

:root {
  /* Color Palette - HSL tailored medical dark theme */
  --bg-primary: hsl(222, 47%, 7%);
  --bg-secondary: hsl(222, 35%, 11%);
  --bg-card: hsla(222, 35%, 15%, 0.7);
  --border-color: hsla(217, 30%, 60%, 0.12);
  --border-focus: hsla(210, 100%, 65%, 0.4);
  
  --text-main: hsl(210, 40%, 96%);
  --text-secondary: hsl(215, 25%, 72%);
  --text-muted: hsl(215, 16%, 55%);
  
  /* Status Colors */
  --color-primary: hsl(210, 100%, 60%);
  --color-primary-glow: hsla(210, 100%, 60%, 0.2);
  --color-recommended: hsl(158, 75%, 42%);
  --color-recommended-bg: hsla(158, 75%, 42%, 0.12);
  --color-alternative: hsl(42, 95%, 53%);
  --color-alternative-bg: hsla(42, 95%, 53%, 0.12);
  --color-avoid: hsl(355, 85%, 60%);
  --color-avoid-bg: hsla(355, 85%, 60%, 0.12);
  
  /* Fonts & Shadows */
  --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --shadow-lg: 0 10px 30px -10px hsla(222, 60%, 2%, 0.8);
  --shadow-sm: 0 4px 12px hsla(222, 60%, 2%, 0.3);
  --glass-blur: blur(16px);
  
  /* Safe area for mobile notch */
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.5;
  min-height: 100vh;
  padding-bottom: calc(24px + var(--safe-bottom));
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 10% 20%, hsla(210, 80%, 40%, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 90% 80%, hsla(158, 80%, 40%, 0.05) 0%, transparent 40%);
  background-attachment: fixed;
}

/* Layout Wrapper */
.app-container {
  max-width: 680px;
  margin: 0 auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Header styling */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 6px;
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.icon-pulse {
  color: var(--color-primary);
  filter: drop-shadow(0 0 8px var(--color-primary));
  animation: pulse-effect 2.5s infinite ease-in-out;
}

@keyframes pulse-effect {
  0%, 100% { opacity: 0.9; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.08); filter: drop-shadow(0 0 12px var(--color-primary)); }
}

.logo-text h1 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--text-main) 30%, hsl(210, 100%, 75%));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-text .subtitle {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* PWA Online/Offline indicator */
.pwa-status {
  display: flex;
  align-items: center;
  gap: 6px;
  background-color: var(--bg-secondary);
  padding: 6px 12px;
  border-radius: 99px;
  border: 1px solid var(--border-color);
  font-size: 0.75rem;
  font-weight: 500;
}

.pwa-status .status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-recommended);
  box-shadow: 0 0 8px var(--color-recommended);
}

.pwa-status.offline .status-dot {
  background-color: var(--color-alternative);
  box-shadow: 0 0 8px var(--color-alternative);
}

/* Base Card Style (Glassmorphism) */
.card {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 20px;
  box-shadow: var(--shadow-lg);
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  border-color: hsla(217, 30%, 60%, 0.2);
}

.card-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.card-title svg {
  color: var(--color-primary);
}

/* Weight input styling */
.weight-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.weight-card .card-title {
  margin-bottom: 0;
}

.weight-input-container {
  display: flex;
  align-items: baseline;
  background: hsla(222, 35%, 8%, 0.6);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 6px 14px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.weight-input-container:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 10px var(--color-primary-glow);
}

.weight-number-input {
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 1.6rem;
  font-weight: 700;
  width: 65px;
  text-align: right;
}

/* Hide arrow wheels on input number */
.weight-number-input::-webkit-outer-spin-button,
.weight-number-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
.weight-number-input[type=number] {
  -moz-appearance: textfield;
}

.weight-unit {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-left: 4px;
}

/* Slider Controls */
.slider-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 8px 0;
}

.slider-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  width: 38px;
  height: 38px;
  border-radius: 50%;
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, transform 0.1s;
}

.slider-btn:active {
  transform: scale(0.92);
  background: hsla(222, 30%, 20%, 0.8);
}

.weight-slider {
  flex-grow: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 8px;
  border-radius: 99px;
  background: hsla(222, 35%, 8%, 0.8);
  outline: none;
  border: 1px solid var(--border-color);
}

/* Custom Slider Thumb */
.weight-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: linear-gradient(135deg, hsl(210, 100%, 65%), hsl(210, 100%, 50%));
  cursor: pointer;
  box-shadow: 0 0 10px var(--color-primary-glow);
  transition: transform 0.1s, background-color 0.2s;
  border: 2px solid var(--text-main);
}

.weight-slider::-webkit-slider-thumb:hover {
  transform: scale(1.1);
}

.weight-slider::-webkit-slider-thumb:active {
  transform: scale(0.95);
}

.weight-slider::-moz-range-thumb {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: linear-gradient(135deg, hsl(210, 100%, 65%), hsl(210, 100%, 50%));
  cursor: pointer;
  box-shadow: 0 0 10px var(--color-primary-glow);
  transition: transform 0.1s;
  border: 2px solid var(--text-main);
}

/* Quick weights grid */
.quick-weights {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 8px;
}

.quick-weight-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 8px 4px;
  border-radius: 10px;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.quick-weight-btn:hover {
  border-color: hsla(217, 30%, 60%, 0.3);
  color: var(--text-main);
}

.quick-weight-btn.active {
  background: var(--color-primary-glow);
  border-color: var(--color-primary);
  color: var(--color-primary);
  box-shadow: 0 0 8px hsla(210, 100%, 60%, 0.15);
}

/* Scenario Selector */
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.scenario-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 12px;
  text-align: left;
  cursor: pointer;
  font-family: var(--font-sans);
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.scenario-btn::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background-color: transparent;
  transition: background-color 0.2s;
}

.scenario-btn.active {
  background: hsla(222, 35%, 18%, 0.8);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.scenario-btn.active::after {
  background-color: var(--color-primary);
}

.scenario-name {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-main);
}

.scenario-desc {
  font-size: 0.72rem;
  color: var(--text-muted);
  line-height: 1.2;
}

.scenario-btn.active .scenario-desc {
  color: var(--text-secondary);
}

/* Drug List and Cards */
.drug-category-section {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.category-header {
  padding: 4px 6px;
}

.category-header h2 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-top: 4px;
  display: inline-block;
  background: linear-gradient(135deg, var(--text-main), var(--text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.category-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.step-badge {
  background: var(--color-primary-glow);
  color: var(--color-primary);
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 2px 8px;
  border-radius: 4px;
  letter-spacing: 0.05em;
  display: inline-block;
}

.drug-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* Premium Drug Card */
.drug-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 14px;
  border-left-width: 5px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Recommendation borders and colors */
.drug-card.recommended {
  border-left-color: var(--color-recommended);
  background: linear-gradient(to right, var(--color-recommended-bg) 0%, var(--bg-card) 20%);
}

.drug-card.alternative {
  border-left-color: var(--color-alternative);
  background: linear-gradient(to right, var(--color-alternative-bg) 0%, var(--bg-card) 20%);
}

.drug-card.avoid {
  border-left-color: var(--color-avoid);
  background: linear-gradient(to right, var(--color-avoid-bg) 0%, var(--bg-card) 25%);
  opacity: 0.7;
}

.drug-card.avoid:hover {
  opacity: 0.95;
}

/* Row 1: Drug Info & Status Badge */
.drug-info-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 8px;
}

.drug-meta h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 6px;
}

.drug-presentation {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-top: 1px;
}

/* Recommendation Status badge */
.status-badge {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 4px 8px;
  border-radius: 6px;
  letter-spacing: 0.02em;
}

.drug-card.recommended .status-badge {
  background-color: var(--color-recommended-bg);
  color: hsl(158, 80%, 45%);
  border: 1px solid hsla(158, 75%, 42%, 0.25);
}

.drug-card.alternative .status-badge {
  background-color: var(--color-alternative-bg);
  color: hsl(42, 95%, 45%);
  border: 1px solid hsla(42, 95%, 53%, 0.25);
}

.drug-card.avoid .status-badge {
  background-color: var(--color-avoid-bg);
  color: hsl(355, 85%, 65%);
  border: 1px solid hsla(355, 85%, 60%, 0.25);
}

/* Row 2: Calculation Results & Quick Adjust */
.drug-calculation-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: hsla(222, 35%, 8%, 0.4);
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

.dose-display {
  display: flex;
  flex-direction: column;
}

.calculated-volume {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: baseline;
  gap: 2px;
}

.calculated-volume .unit {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.calculated-mass {
  font-size: 0.78rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* Adjust Dose widgets */
.dose-adjuster {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-secondary);
  padding: 4px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.adjust-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  width: 28px;
  height: 28px;
  border-radius: 6px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
}

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

.adjust-btn:active {
  transform: scale(0.9);
}

.current-dose-factor {
  font-size: 0.78rem;
  font-weight: 700;
  min-width: 78px;
  text-align: center;
  color: var(--text-main);
}

/* Row 3: Recommendations / Warnings description */
.drug-feedback-row {
  font-size: 0.75rem;
  line-height: 1.35;
  padding: 8px 12px;
  border-radius: 8px;
}

.drug-card.recommended .drug-feedback-row {
  background-color: var(--color-recommended-bg);
  color: hsl(158, 80%, 75%);
}

.drug-card.alternative .drug-feedback-row {
  background-color: var(--color-alternative-bg);
  color: hsl(42, 95%, 75%);
}

.drug-card.avoid .drug-feedback-row {
  background-color: var(--color-avoid-bg);
  color: hsl(355, 85%, 80%);
}

/* Guidelines Layout */
.guidelines-card {
  border-left: 3px solid var(--color-primary);
  background: linear-gradient(to bottom, var(--bg-card), hsla(222, 35%, 10%, 0.8));
}

.guidelines-content {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.guideline-item {
  font-size: 0.78rem;
  color: var(--text-secondary);
  line-height: 1.4;
  position: relative;
  padding-left: 12px;
}

.guideline-item::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: bold;
}

/* Footer layout */
.app-footer {
  text-align: center;
  padding: 16px 6px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.app-footer p {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.app-footer .disclaimer {
  font-size: 0.68rem;
  line-height: 1.4;
  border-top: 1px solid var(--border-color);
  padding-top: 12px;
}

/* PWA Install Banner */
.install-banner {
  position: static;
  max-width: 648px;
  margin: 12px auto;
  background: var(--bg-secondary);
  border: 1px solid var(--color-primary);
  border-radius: 16px;
  padding: 14px 18px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.7);
  z-index: 1000;
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  transition: opacity 0.3s, transform 0.3s;
  animation: slide-up-banner 0.4s cubic-bezier(0.18, 0.89, 0.32, 1.28);
}

@keyframes slide-up-banner {
  from { transform: translateY(40px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.install-banner.hidden {
  display: none !important;
}

.install-content {
  display: flex;
  align-items: center;
  gap: 12px;
}

.install-content svg {
  color: var(--color-primary);
  flex-shrink: 0;
}

.install-text h3 {
  font-size: 0.88rem;
  font-weight: 700;
}

.install-text p {
  font-size: 0.72rem;
  color: var(--text-secondary);
}

.install-actions {
  display: flex;
  gap: 8px;
}

.install-btn-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  padding: 8px 12px;
}

.install-btn-action {
  background: var(--color-primary);
  color: var(--bg-primary);
  border: none;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 8px 16px;
  border-radius: 8px;
  cursor: pointer;
  transition: opacity 0.15s;
}

.install-btn-action:hover {
  opacity: 0.9;
}

/* Responsiveness on larger screens */
@media (min-width: 480px) {
  .scenario-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}