/**
 * Attune A2UI Design System
 *
 * Design Philosophy:
 * - Delight = relief, not excitement
 * - Calm, not busy
 * - Spacious, not cramped
 * - Deliberate, not urgent
 *
 * Principles:
 * - White space is intentional
 * - One idea per element
 * - Progressive disclosure (complexity reveals progressively)
 * - No urgency signals (no countdown timers, red dots, badges)
 *
 * Architecture:
 * - Matches UI Requirements Story (Sarah's journey)
 * - Supports 3 states: Exploration, Simulation, Escalation
 * - Mobile-first responsive
 *
 * Date: 2026-01-08
 * Version: 1.0
 */

/* ============================================================================
   DESIGN TOKENS
   ============================================================================ */

:root {
  /* Typography */
  --font-serif: 'Crimson Pro', Georgia, serif;
  --font-sans: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
  --font-family-base: var(--font-sans);
  --font-family-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code',
    'Courier New', monospace;

  --font-size-xs: 0.75rem; /* 12px */
  --font-size-sm: 0.875rem; /* 14px */
  --font-size-base: 1rem; /* 16px */
  --font-size-lg: 1.125rem; /* 18px */
  --font-size-xl: 1.25rem; /* 20px */
  --font-size-2xl: 1.5rem; /* 24px */
  --font-size-3xl: 2rem; /* 32px */
  --font-size-4xl: 2.5rem; /* 40px */

  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  --line-height-loose: 2;

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;

  /* Color Palette (Warm, Sophisticated) */
  --color-ink: #0f0f0f;
  --color-ink-soft: #1a1a1a;
  --color-ink-muted: #5a5a5a;
  --color-ink-faint: #8a8a8a;
  --color-paper: #faf9f7;
  --color-paper-warm: #f5f3ef;
  --color-white: #ffffff;
  --color-accent: #8e4b2d;
  --color-accent-soft: rgba(142, 75, 45, 0.08);
  --color-accent-glow: rgba(142, 75, 45, 0.15);
  --color-accent-hover: #7a4027;
  --color-border: rgba(0,0,0,0.06);
  --color-border-strong: rgba(0,0,0,0.1);
  --color-success: #3d7a5a;
  --color-caution: #a67c37;
  --color-risk: #9a4a2a;

  /* Legacy color mappings for compatibility */
  --color-text-primary: var(--color-ink);
  --color-text-secondary: var(--color-ink-muted);
  --color-text-tertiary: var(--color-ink-muted);
  --color-text-muted: var(--color-ink-faint);

  --color-background: var(--color-paper);
  --color-background-subtle: var(--color-paper-warm);
  --color-background-muted: var(--color-paper-warm);

  --color-border-muted: var(--color-border);

  --color-primary: var(--color-accent);
  --color-primary-hover: var(--color-accent-hover);
  --color-primary-subtle: var(--color-accent-soft);

  --color-success-subtle: rgba(61, 122, 90, 0.1);

  --color-warning: var(--color-caution);
  --color-warning-subtle: rgba(166, 124, 55, 0.1);

  --color-danger: var(--color-risk);
  --color-danger-subtle: rgba(154, 74, 42, 0.1);

  /* Spacing Scale (Generous) */
  --space-0: 0;
  --space-1: 0.25rem; /* 4px */
  --space-2: 0.5rem; /* 8px */
  --space-3: 0.75rem; /* 12px */
  --space-4: 1rem; /* 16px */
  --space-6: 1.5rem; /* 24px */
  --space-8: 2rem; /* 32px */
  --space-12: 3rem; /* 48px */
  --space-16: 4rem; /* 64px */
  --space-24: 6rem; /* 96px */
  --space-32: 8rem; /* 128px */

  /* Border Radius (Subtle) */
  --radius-sm: 0.25rem; /* 4px */
  --radius-md: 0.375rem; /* 6px */
  --radius-lg: 0.5rem; /* 8px */
  --radius-xl: 0.75rem; /* 12px */

  /* Shadows (Minimal) */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);

  /* Transitions (Deliberate, Not Instant) */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;

  /* Layout Constraints */
  --max-width-sm: 640px;
  --max-width-md: 768px;
  --max-width-lg: 1024px;
  --max-width-content: 800px; /* Comfortable reading width */

  /* Easing Curves (Smooth, Deliberate) */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
}

/* ============================================================================
   ANIMATIONS (Smooth, Deliberate)
   ============================================================================ */

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

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

@keyframes breathe {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.5; }
  50% { transform: scale(1.5); opacity: 0; }
}

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

/* Animation Utilities */
.animate-fade-up {
  animation: fadeUp 0.8s var(--ease-out-expo) forwards;
}

.animate-fade-in {
  animation: fadeIn 0.5s var(--ease-out-quart) forwards;
}

.animate-delay-1 { animation-delay: 0.1s; opacity: 0; }
.animate-delay-2 { animation-delay: 0.2s; opacity: 0; }
.animate-delay-3 { animation-delay: 0.3s; opacity: 0; }
.animate-delay-4 { animation-delay: 0.4s; opacity: 0; }
.animate-delay-5 { animation-delay: 0.5s; opacity: 0; }

/* ============================================================================
   BASE STYLES
   ============================================================================ */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 16px; /* Base for rem units */
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed); /* Generous line height */
  color: var(--color-ink);
  background-color: var(--color-paper);
}

/* ============================================================================
   TYPOGRAPHY (One Idea Per Element)
   ============================================================================ */

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0 0 var(--space-4) 0;
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  color: var(--color-text-primary);
}

h1 {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--space-6);
}

h2 {
  font-size: var(--font-size-3xl);
}

h3 {
  font-size: var(--font-size-2xl);
}

h4 {
  font-size: var(--font-size-xl);
}

p {
  margin: 0 0 var(--space-4) 0;
  max-width: 65ch; /* Comfortable reading width */
}

small {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

mark {
  background-color: var(--color-primary-subtle);
  color: var(--color-text-primary);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  font-weight: var(--font-weight-medium);
}

/* Visually hidden (accessibility) */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ============================================================================
   LAYOUT (Calm, Spacious)
   ============================================================================ */

.a2ui-container {
  max-width: var(--max-width-content);
  margin: 0 auto;
  padding: var(--space-8) var(--space-4);
}

@media (min-width: 768px) {
  .a2ui-container {
    padding: var(--space-16) var(--space-8);
  }
}

/* ============================================================================
   STATE 1: EXPLORATION COMPONENTS
   ============================================================================ */

.hero {
  text-align: center;
  margin-bottom: var(--space-16);
  padding: var(--space-12) var(--space-4);
}

.hero-title {
  font-size: var(--font-size-3xl);
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-4);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

@media (min-width: 768px) {
  .hero-title {
    font-size: var(--font-size-4xl);
  }
}

.hero-subhead {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  margin: 0;
}

.decision-input-form {
  margin: var(--space-8) 0;
}

.decision-textarea {
  width: 100%;
  min-height: 150px;
  padding: var(--space-4);
  font-family: var(--font-family-base);
  font-size: var(--font-size-lg);
  line-height: var(--line-height-relaxed);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  resize: vertical;
  transition: border-color var(--transition-base);
}

.decision-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

.decision-textarea::placeholder {
  color: var(--color-text-muted);
}

.decision-note {
  margin-top: var(--space-2);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.reflection-card {
  background: var(--color-background-subtle);
  border: 1px solid var(--color-border-muted);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin: var(--space-8) 0;
}

.reflection-title {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-4);
  color: var(--color-text-secondary);
}

.reflection-content {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.reflection-highlight {
  display: inline-block;
}

.reflection-original {
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border-muted);
  color: var(--color-text-tertiary);
}

.clarification-question {
  margin: var(--space-12) 0;
  padding: var(--space-8);
  background: var(--color-background);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.question-text {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-6);
  line-height: var(--line-height-normal);
}

.question-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

@media (min-width: 640px) {
  .question-options {
    flex-direction: row;
  }
}

.option-button {
  flex: 1;
  padding: var(--space-4) var(--space-6);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-background);
  color: var(--color-text-primary);
  cursor: pointer;
  transition: all var(--transition-base);
}

.option-button:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-subtle);
}

.option-button.selected {
  border-color: var(--color-primary);
  background: var(--color-primary);
  color: white;
}

.question-input {
  width: 100%;
  padding: var(--space-4);
  font-size: var(--font-size-lg);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.context-note {
  padding: var(--space-4);
  border-radius: var(--radius-md);
  margin: var(--space-4) 0;
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
}

.context-note--info {
  background: var(--color-primary-subtle);
  color: var(--color-text-primary);
  border-left: 4px solid var(--color-primary);
}

.context-note--warning {
  background: var(--color-warning-subtle);
  color: var(--color-text-primary);
  border-left: 4px solid var(--color-warning);
}

.context-note--success {
  background: var(--color-success-subtle);
  color: var(--color-text-primary);
  border-left: 4px solid var(--color-success);
}

/* ============================================================================
   STATE 2: SIMULATION COMPONENTS
   ============================================================================ */

.simulation-progress {
  margin: var(--space-8) 0;
  padding: var(--space-6);
  background: var(--color-background-subtle);
  border-radius: var(--radius-lg);
}

.progress-step {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin: 0;
  padding: var(--space-2) 0;
  font-style: italic;
}

.progress-list {
  list-style: none;
  padding: 0;
  margin: var(--space-4) 0 0 0;
}

.progress-item {
  padding: var(--space-2) 0;
  color: var(--color-text-tertiary);
  transition: color var(--transition-base);
}

.progress-item.active {
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
}

.results-panel {
  margin: var(--space-12) 0;
}

.results-section {
  margin: var(--space-8) 0;
  padding: var(--space-8);
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.results-section h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-6);
}

.conditions-list,
.scenarios-list,
.recommendations-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.condition-item,
.scenario-item,
.recommendation-item {
  padding: var(--space-4);
  margin-bottom: var(--space-3);
  border-left: 3px solid var(--color-border);
  background: var(--color-background-subtle);
  border-radius: var(--radius-sm);
  line-height: var(--line-height-relaxed);
}

.holds-under .condition-item {
  border-left-color: var(--color-success);
}

.breaks-if .scenario-item {
  border-left-color: var(--color-warning);
}

.what-this-means .recommendation-item {
  border-left-color: var(--color-primary);
}

.recommendations-list--sequential {
  counter-reset: recommendation;
}

.recommendations-list--sequential .recommendation-item {
  counter-increment: recommendation;
  padding-left: var(--space-8);
  position: relative;
}

.recommendations-list--sequential .recommendation-item::before {
  content: counter(recommendation);
  position: absolute;
  left: var(--space-4);
  top: var(--space-4);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
}

.condition-probability,
.scenario-impact {
  display: block;
  margin-top: var(--space-2);
  color: var(--color-text-secondary);
}

/* ============================================================================
   ANALYSIS CARDS (Results Display)
   ============================================================================ */

.analysis-section {
  margin-bottom: 2.5rem;
}

.analysis-card {
  background: var(--color-white, #ffffff);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  overflow: hidden;
  animation: fadeUp 0.6s var(--ease-out-expo) forwards;
}

.analysis-card-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.card-indicator {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.card-indicator.holds { background: var(--color-success); }
.card-indicator.assumptions { background: var(--color-caution); }
.card-indicator.breaks { background: var(--color-risk); }

.card-title {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.analysis-card-body {
  padding: 1.5rem;
}

.analysis-item {
  padding: 1rem 0;
  border-bottom: 1px solid var(--color-border);
  animation: fadeUp 0.5s var(--ease-out-expo) forwards;
}

.analysis-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.analysis-item:first-child {
  padding-top: 0;
}

.analysis-item-text {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--color-ink-soft);
}

/* Pattern Card - Dark Variant */
.pattern-card {
  background: var(--color-ink);
  border: none;
  margin-top: 2rem;
}

.pattern-card .analysis-card-header {
  border-bottom-color: rgba(255,255,255,0.1);
}

.pattern-card .card-indicator {
  background: var(--color-accent);
}

.pattern-card .card-title {
  color: rgba(255,255,255,0.5);
}

.pattern-card .analysis-card-body {
  padding: 1.75rem 1.5rem;
}

.pattern-text {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  line-height: 1.8;
  color: rgba(255,255,255,0.9);
  font-style: italic;
}

.pattern-text strong {
  font-style: normal;
  color: white;
}

/* ============================================================================
   STATE 3: ESCALATION COMPONENTS
   ============================================================================ */

.escalation-trigger {
  margin: var(--space-12) 0;
  padding: var(--space-8);
  background: var(--color-background-subtle);
  border-radius: var(--radius-lg);
  text-align: center;
}

.escalation-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

@media (min-width: 640px) {
  .escalation-options {
    flex-direction: row;
    justify-content: center;
  }
}

.escalation-note {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  max-width: 500px;
  margin: var(--space-4) auto 0;
}

.pricing-card {
  max-width: 600px;
  margin: var(--space-12) auto;
  padding: var(--space-8);
  background: var(--color-background);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-xl);
}

.pricing-title {
  text-align: center;
  margin-bottom: var(--space-2);
}

.pricing-reason {
  text-align: center;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
}

.pricing-amount {
  text-align: center;
  margin: var(--space-8) 0;
}

.price-currency {
  font-size: var(--font-size-2xl);
  vertical-align: super;
  color: var(--color-text-secondary);
}

.price-value {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.pricing-includes {
  font-size: var(--font-size-lg);
  margin: var(--space-8) 0 var(--space-4) 0;
}

.pricing-deliverables,
.pricing-constraints {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-6) 0;
}

.pricing-deliverables li,
.pricing-constraints li {
  padding: var(--space-2) 0 var(--space-2) var(--space-6);
  position: relative;
  line-height: var(--line-height-relaxed);
}

.pricing-deliverables li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-success);
  font-weight: var(--font-weight-semibold);
}

.pricing-constraints-title {
  font-size: var(--font-size-base);
  margin-top: var(--space-6);
  margin-bottom: var(--space-3);
  color: var(--color-text-secondary);
}

.pricing-cta {
  width: 100%;
  margin: var(--space-6) 0;
}

.pricing-footer {
  text-align: center;
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
  margin: var(--space-4) 0 0 0;
}

/* ============================================================================
   BUTTONS (Warm, Inviting)
   ============================================================================ */

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: var(--space-4) var(--space-8);
  font-family: var(--font-sans);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  text-align: center;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: 100px;
  cursor: pointer;
  transition: all 0.25s var(--ease-out-quart);
  white-space: nowrap;
}

.button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.button--primary,
.button-primary {
  background: var(--color-accent);
  color: white;
  border-color: var(--color-accent);
}

.button--primary:hover:not(:disabled),
.button-primary:hover:not(:disabled) {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  transform: translateY(-1px);
}

.button--secondary,
.button-secondary {
  background: transparent;
  color: var(--color-ink);
  border-color: var(--color-border-strong);
}

.button--secondary:hover:not(:disabled),
.button-secondary:hover:not(:disabled) {
  background: var(--color-paper-warm);
  border-color: var(--color-ink-muted);
}

.button--ghost {
  background: transparent;
  color: var(--color-accent);
  border-color: transparent;
}

.button--ghost:hover:not(:disabled) {
  background: var(--color-accent-soft);
}

/* Simulate Button (Special) */
.btn-simulate {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background: var(--color-accent);
  color: white;
  border: none;
  border-radius: 100px;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.25s var(--ease-out-quart);
}

.btn-simulate:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
}

.btn-simulate:disabled {
  background: var(--color-ink-faint);
  cursor: not-allowed;
  transform: none;
}

.btn-simulate svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
}

/* ============================================================================
   SPINNER (Minimal, Calm)
   ============================================================================ */

.spinner {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: var(--space-8);
}

.spinner-circle {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-border-muted);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spinner-rotate 0.8s linear infinite;
}

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

/* ============================================================================
   RESPONSIVE UTILITIES
   ============================================================================ */

@media (max-width: 639px) {
  .hide-mobile {
    display: none;
  }
}

@media (min-width: 640px) {
  .show-mobile {
    display: none;
  }
}

/* ============================================================================
   FOCUS STATES (Accessibility)
   ============================================================================ */

button:focus-visible,
input:focus-visible,
textarea:focus-visible,
a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ============================================================================
   PRINT STYLES (Board-Ready Summaries)
   ============================================================================ */

@media print {
  .a2ui-container {
    max-width: none;
  }

  .button,
  .escalation-trigger,
  .pricing-card {
    display: none;
  }

  .results-section {
    page-break-inside: avoid;
  }
}