/* CanReduce ACT Harm Reduction - Design System & Modern CSS */
:root {
  --bg-primary: #0a0f1d;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.85);
  --bg-card-hover: rgba(31, 41, 55, 0.95);
  --border-color: rgba(255, 255, 255, 0.1);
  --border-focus: #38bdf8;
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --accent-cyan: #06b6d4;
  --accent-blue: #3b82f6;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  --accent-purple: #8b5cf6;

  --danger-bg: rgba(239, 68, 68, 0.15);
  --danger-border: #ef4444;
  --danger-text: #fca5a5;

  --warning-bg: rgba(245, 158, 11, 0.15);
  --warning-border: #f59e0b;
  --warning-text: #fcd34d;

  --success-bg: rgba(16, 185, 129, 0.15);
  --success-border: #10b981;
  --success-text: #6ee7b7;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.5);
  --shadow-glow-cyan: 0 0 20px rgba(6, 182, 212, 0.25);
  --shadow-glow-rose: 0 0 25px rgba(244, 63, 94, 0.35);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  padding-bottom: 80px; /* Space for mobile nav */
}

/* Background ambient light */
.ambient-glow {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  max-width: 100vw;
  height: 400px;
  background: radial-gradient(circle, rgba(14, 165, 233, 0.15) 0%, rgba(139, 92, 246, 0.05) 50%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* Header & Navigation */
header.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(10, 15, 29, 0.85);
  border-bottom: 1px solid var(--border-color);
  padding: 12px 20px;
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}

.brand-logo {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, #06b6d4, #3b82f6);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 800;
  font-size: 1.25rem;
  box-shadow: var(--shadow-glow-cyan);
}

.brand-text h1 {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 6px;
}

.badge-act {
  font-size: 0.65rem;
  text-transform: uppercase;
  background: rgba(6, 182, 212, 0.2);
  color: #38bdf8;
  border: 1px solid rgba(56, 189, 248, 0.3);
  padding: 2px 6px;
  border-radius: var(--radius-full);
  font-weight: 700;
}

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

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

.btn-sos {
  background: linear-gradient(135deg, #e11d48, #ef4444);
  color: white;
  border: none;
  border-radius: var(--radius-full);
  padding: 8px 16px;
  font-weight: 700;
  font-size: 0.85rem;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  box-shadow: var(--shadow-glow-rose);
  animation: pulse-soft 2s infinite;
  transition: transform var(--transition-fast);
}

.btn-sos:hover {
  transform: scale(1.04);
}

@keyframes pulse-soft {
  0%, 100% { box-shadow: 0 0 10px rgba(244, 63, 94, 0.3); }
  50% { box-shadow: 0 0 24px rgba(244, 63, 94, 0.6); }
}

/* Nav Tabs */
nav.desktop-nav {
  display: none;
  gap: 8px;
}

@media (min-width: 860px) {
  nav.desktop-nav {
    display: flex;
  }
}

.nav-tab-btn {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid transparent;
  padding: 8px 14px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition-fast);
}

.nav-tab-btn:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.05);
}

.nav-tab-btn.active {
  color: #38bdf8;
  background: rgba(6, 182, 212, 0.12);
  border-color: rgba(56, 189, 248, 0.25);
}

/* Mobile Bottom Navigation Bar */
nav.mobile-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(10, 15, 29, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--border-color);
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  padding: 6px 4px calc(6px + env(safe-area-inset-bottom, 0px));
  z-index: 100;
}

@media (min-width: 860px) {
  nav.mobile-nav {
    display: none;
  }
}

.mobile-nav-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 0.7rem;
  font-weight: 500;
  padding: 6px 0;
  cursor: pointer;
  transition: color var(--transition-fast);
}

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

.mobile-nav-btn.active {
  color: #38bdf8;
}

/* Main Container & Layout */
main.app-main {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 16px;
  z-index: 1;
}

.tab-pane {
  display: none;
  animation: fadeIn 0.25s ease-out;
}

.tab-pane.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Hero Banners & Section Headers */
.section-hero {
  background: linear-gradient(135deg, rgba(30, 41, 59, 0.8), rgba(15, 23, 42, 0.9));
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px 20px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.hero-highlight {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(6, 182, 212, 0.15);
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: #38bdf8;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.section-hero h2 {
  font-size: 1.7rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.section-hero p {
  color: var(--text-muted);
  max-width: 720px;
  font-size: 0.95rem;
}

/* Status Indicator Pill */
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
}

.status-pill.open {
  background: var(--success-bg);
  border: 1px solid var(--success-border);
  color: var(--success-text);
}

.status-pill.closed {
  background: rgba(148, 163, 184, 0.1);
  border: 1px solid rgba(148, 163, 184, 0.3);
  color: var(--text-muted);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: currentColor;
}

.status-pill.open .status-dot {
  animation: pulse-dot 1.5s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.8); }
}

/* Cards & Grid Layouts */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

@media (min-width: 768px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.card:hover {
  border-color: rgba(255, 255, 255, 0.2);
}

.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Alerts System */
.alert-card {
  border-left: 4px solid transparent;
  margin-bottom: 16px;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 18px;
  border-top: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.alert-card.danger {
  border-left-color: #ef4444;
  background: linear-gradient(90deg, rgba(239, 68, 68, 0.08) 0%, var(--bg-card) 60%);
}

.alert-card.warning {
  border-left-color: #f59e0b;
  background: linear-gradient(90deg, rgba(245, 158, 11, 0.08) 0%, var(--bg-card) 60%);
}

.alert-card.info {
  border-left-color: #3b82f6;
  background: linear-gradient(90deg, rgba(59, 130, 246, 0.08) 0%, var(--bg-card) 60%);
}

.badge-alert {
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: var(--radius-full);
}

.badge-alert.danger { background: #ef4444; color: white; }
.badge-alert.warning { background: #f59e0b; color: black; }
.badge-alert.info { background: #3b82f6; color: white; }

/* Filter Buttons & Categories */
.filter-bar {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 10px;
  margin-bottom: 20px;
  scrollbar-width: none;
}

.filter-bar::-webkit-scrollbar {
  display: none;
}

.filter-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 8px 16px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.1);
}

.filter-btn.active {
  background: #38bdf8;
  color: #0f172a;
  border-color: #38bdf8;
  font-weight: 700;
}

/* Search input */
.search-box {
  position: relative;
  margin-bottom: 20px;
}

.search-input {
  width: 100%;
  background: rgba(17, 24, 39, 0.9);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px 16px 12px 42px;
  color: var(--text-main);
  font-size: 0.95rem;
  transition: border-color var(--transition-fast);
}

.search-input:focus {
  outline: none;
  border-color: var(--border-focus);
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-dim);
  pointer-events: none;
}

/* Substance Card Details */
.substance-card {
  cursor: pointer;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.substance-card:hover {
  transform: translateY(-2px);
  border-color: rgba(56, 189, 248, 0.4);
}

.substance-meta {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin: 10px 0;
}

.meta-chip {
  font-size: 0.72rem;
  background: rgba(255, 255, 255, 0.06);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
}

/* Modals & Drawers */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 200;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.modal-backdrop.active {
  display: flex;
}

.modal-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  max-width: 720px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  padding: 24px;
  box-shadow: var(--shadow-lg);
  position: relative;
  animation: modalPop 0.2s ease-out;
}

@keyframes modalPop {
  from { opacity: 0; transform: scale(0.96); }
  to { opacity: 1; transform: scale(1); }
}

.modal-close-btn {
  position: absolute;
  top: 18px;
  right: 18px;
  background: rgba(255, 255, 255, 0.1);
  border: none;
  color: var(--text-muted);
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.modal-close-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  color: white;
}

/* Naloxone Step-by-Step Simulator */
.stepper-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.stepper-nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
}

.stepper-dot {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--text-muted);
  cursor: pointer;
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.stepper-dot.active {
  background: #38bdf8;
  color: #0f172a;
  border-color: #38bdf8;
  transform: scale(1.1);
}

.stepper-dot.completed {
  background: var(--success-bg);
  border-color: var(--success-border);
  color: var(--success-text);
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.step-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.step-instruction-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 16px 0;
}

.step-instruction-list li {
  padding-left: 28px;
  position: relative;
  color: #cbd5e1;
}

.step-instruction-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: #38bdf8;
  font-weight: 800;
}

.formulation-toggle {
  display: inline-flex;
  background: rgba(0, 0, 0, 0.3);
  padding: 4px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
}

.toggle-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.toggle-btn.active {
  background: #38bdf8;
  color: #0f172a;
}

/* CPR Metronome Box */
.metronome-box {
  background: radial-gradient(circle at center, rgba(30, 41, 59, 0.9), rgba(15, 23, 42, 1));
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  text-align: center;
  margin-top: 20px;
}

.pulse-circle {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  margin: 20px auto;
  background: rgba(56, 189, 248, 0.1);
  border: 3px solid #38bdf8;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: transform 0.08s ease-out, background-color 0.08s ease-out;
}

.pulse-circle.beat {
  transform: scale(1.15);
  background: rgba(56, 189, 248, 0.35);
  box-shadow: 0 0 30px rgba(56, 189, 248, 0.5);
}

.btn-primary {
  background: linear-gradient(135deg, #0284c7, #0369a1);
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition-fast);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #0369a1, #075985);
  transform: translateY(-1px);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  padding: 10px 18px;
  border-radius: var(--radius-md);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.18);
}

/* Quiz UI */
.quiz-option {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  padding: 14px 18px;
  border-radius: var(--radius-md);
  margin-bottom: 10px;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.quiz-option:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.3);
}

.quiz-option.correct {
  background: var(--success-bg);
  border-color: var(--success-border);
  color: var(--success-text);
}

.quiz-option.incorrect {
  background: var(--danger-bg);
  border-color: var(--danger-border);
  color: var(--danger-text);
}

/* Interactions Matrix UI */
.interaction-selector-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 24px;
}

@media (max-width: 640px) {
  .interaction-selector-grid {
    grid-template-columns: 1fr;
  }
}

.select-custom {
  width: 100%;
  background: rgba(17, 24, 39, 0.95);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
}

.select-custom:focus {
  outline: none;
  border-color: var(--border-focus);
}

.badge-dangerous { background: #ef4444; color: white; }
.badge-unsafe { background: #f97316; color: white; }
.badge-caution { background: #eab308; color: black; }
.badge-synergy { background: #10b981; color: white; }
.badge-neutral { background: #06b6d4; color: white; }

.badge-pill {
  display: inline-block;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 10px;
}

/* Emergency Drawer / Overlay */
.emergency-sheet {
  background: #18181b;
  border-top: 2px solid #ef4444;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  max-width: 600px;
  margin: 0 auto;
  z-index: 300;
  padding: 24px 20px calc(24px + env(safe-area-inset-bottom, 0px));
  box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.8);
  transform: translateY(100%);
  transition: transform 0.25s ease-out;
}

.emergency-sheet.active {
  transform: translateY(0);
}

.emergency-btn-call {
  background: #ef4444;
  color: white;
  text-decoration: none;
  padding: 16px;
  border-radius: var(--radius-md);
  font-size: 1.25rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 16px;
  box-shadow: 0 0 20px rgba(239, 68, 68, 0.4);
}

.emergency-contacts-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.contact-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.05);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: var(--text-main);
  transition: background var(--transition-fast);
}

.contact-row:hover {
  background: rgba(255, 255, 255, 0.1);
}

/* Utilities */
.text-cyan { color: var(--accent-cyan); }
.text-rose { color: var(--accent-rose); }
.text-amber { color: var(--accent-amber); }
.text-emerald { color: var(--accent-emerald); }
.mt-2 { margin-top: 8px; }
.mt-4 { margin-top: 16px; }
.mb-2 { margin-bottom: 8px; }
.mb-4 { margin-bottom: 16px; }