/*
 * Sikai — Design System
 * Plain CSS with custom properties (no build step required)
 * Semantic class catalogue aligned with rails-best-practices/references/rails-conventions.md
 */

/* ================================================================
   CSS Custom Properties (Design Tokens)
   ================================================================ */

:root {
  /* Brand */
  --color-accent:          #2563EB;
  --color-accent-hover:    #1D4ED8;
  --color-accent-active:   #1E40AF;
  --color-accent-subtle:   #EFF6FF;
  --color-accent-muted:    #BFDBFE;

  /* Semantic */
  --color-destructive:       #DC2626;
  --color-destructive-hover: #B91C1C;
  --color-success:           #16A34A;
  --color-warning:           #D97706;
  --color-info:              #0EA5E9;

  /* Text */
  --color-text-primary:   #0F172A;
  --color-text-secondary: #475569;
  --color-text-muted:     #94A3B8;
  --color-text-inverted:  #FFFFFF;

  /* Borders */
  --color-border:         #E2E8F0;
  --color-border-strong:  #CBD5E1;
  --color-border-focus:   #2563EB;

  /* Backgrounds */
  --color-bg-primary:     #FFFFFF;
  --color-bg-secondary:   #F8FAFC;
  --color-bg-tertiary:    #F1F5F9;
  --color-bg-overlay:     rgba(15, 23, 42, 0.5);

  /* Spacing */
  --space-1:  4px;
  --space-2:  8px;
  --space-3:  12px;
  --space-4:  16px;
  --space-5:  20px;
  --space-6:  24px;
  --space-8:  32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;

  /* Legacy aliases (keep for backward compat) */
  --space-xs: var(--space-1);
  --space-sm: var(--space-2);
  --space-md: var(--space-4);
  --space-lg: var(--space-6);
  --space-xl: var(--space-8);
  --space-2xl: var(--space-12);
  --space-3xl: var(--space-16);

  /* Typography */
  --font-family:       "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-size-xs:      12px;
  --font-size-sm:      14px;
  --font-size-base:    16px;
  --font-size-lg:      18px;
  --font-size-xl:      20px;
  --font-size-2xl:     24px;
  --font-size-3xl:     30px;
  --font-size-4xl:     36px;

  /* Legacy aliases */
  --font-size-body:    var(--font-size-base);
  --font-size-label:   var(--font-size-sm);
  --font-size-heading: var(--font-size-2xl);
  --font-size-display: var(--font-size-3xl);

  /* Borders */
  --radius-sm:   6px;
  --radius-md:   10px;
  --radius-lg:   16px;
  --radius-full: 9999px;
  --border-radius-sm:   var(--radius-sm);
  --border-radius-md:   var(--radius-md);
  --border-radius-full: var(--radius-full);

  /* Shadows */
  --shadow-xs:   0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-sm:   0 1px 3px rgba(15, 23, 42, 0.08), 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-md:   0 4px 6px rgba(15, 23, 42, 0.07), 0 2px 4px rgba(15, 23, 42, 0.06);
  --shadow-lg:   0 10px 15px rgba(15, 23, 42, 0.08), 0 4px 6px rgba(15, 23, 42, 0.05);
  --shadow-card: var(--shadow-sm);

  /* Touch */
  --touch-target: 44px;

  /* Transitions */
  --transition-fast:   0.12s ease;
  --transition-base:   0.18s ease;
  --transition-slow:   0.3s ease;
}

/* ================================================================
   Base Reset & Defaults
   ================================================================ */

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

html {
  font-size: var(--font-size-base);
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-weight: 600;
  line-height: 1.25;
  color: var(--color-text-primary);
  letter-spacing: -0.01em;
}

p { margin: 0; }

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover { color: var(--color-accent-hover); text-decoration: underline; }

a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ================================================================
   Auth Layout
   ================================================================ */

.auth-page {
  min-height: 100vh;
  background: linear-gradient(160deg, #F0F7FF 0%, #F8FAFC 50%, #FFFFFF 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-12) var(--space-4);
}

.auth-wordmark {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: var(--space-6);
  line-height: 1;
  letter-spacing: -0.03em;
}

.auth-card {
  background-color: var(--color-bg-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
  padding: var(--space-8);
  width: 100%;
  max-width: 400px;
}

.auth-heading {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: var(--space-1);
  text-align: center;
  color: var(--color-text-primary);
}

.auth-subheading {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  text-align: center;
  margin-bottom: var(--space-6);
  line-height: 1.5;
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  margin-top: var(--space-6);
}

.auth-divider {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: var(--space-2) 0;
}

.auth-divider::before,
.auth-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background-color: var(--color-border);
}

.auth-links {
  margin-top: var(--space-4);
  text-align: center;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.auth-footer {
  margin-top: var(--space-5);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  text-align: center;
}

.auth-link {
  color: var(--color-accent);
  font-weight: 600;
}

.auth-link:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

/* ================================================================
   Form Elements
   ================================================================ */

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.form-label {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-primary);
  line-height: 1.4;
}

.form-input {
  height: var(--touch-target);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0 var(--space-4);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  width: 100%;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
  appearance: none;
  -webkit-appearance: none;
}

.form-input::placeholder {
  color: var(--color-text-muted);
}

.form-input:hover:not(:focus) {
  border-color: var(--color-border-strong);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
  background-color: #FAFEFF;
}

.form-input--error {
  border-color: var(--color-destructive);
}

.form-input--error:focus {
  border-color: var(--color-destructive);
  box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.12);
}

.form-error {
  font-size: var(--font-size-sm);
  color: var(--color-destructive);
  line-height: 1.4;
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.form-hint {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: 1.4;
}

/* Select dropdown */
select.form-input {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2364748B' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-4) center;
  padding-right: var(--space-10);
  cursor: pointer;
}

/* ================================================================
   Buttons
   ================================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  height: var(--touch-target);
  padding: 0 var(--space-5);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1.5px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
  white-space: nowrap;
  letter-spacing: -0.01em;
}

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

.btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Primary */
.btn--primary,
.btn-primary {
  background-color: var(--color-accent);
  color: #FFFFFF;
  border-color: var(--color-accent);
}

.btn--primary:hover,
.btn-primary:hover {
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.35);
  text-decoration: none;
  color: #FFFFFF;
}

.btn--primary:active,
.btn-primary:active {
  background-color: var(--color-accent-active);
}

.btn--primary:disabled,
.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  box-shadow: none;
}

/* Secondary */
.btn--secondary,
.btn-secondary {
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  border-color: var(--color-border-strong);
}

.btn--secondary:hover,
.btn-secondary:hover {
  background-color: var(--color-bg-secondary);
  border-color: var(--color-border-strong);
  text-decoration: none;
  color: var(--color-text-primary);
}

/* Danger / Destructive */
.btn--destructive,
.btn-danger {
  background-color: var(--color-destructive);
  color: #FFFFFF;
  border-color: var(--color-destructive);
}

.btn--destructive:hover,
.btn-danger:hover {
  background-color: var(--color-destructive-hover);
  border-color: var(--color-destructive-hover);
  box-shadow: 0 2px 8px rgba(220, 38, 38, 0.3);
  text-decoration: none;
  color: #FFFFFF;
}

/* Ghost */
.btn-ghost {
  background-color: transparent;
  color: var(--color-text-secondary);
  border-color: transparent;
}

.btn-ghost:hover {
  background-color: var(--color-bg-secondary);
  color: var(--color-text-primary);
  text-decoration: none;
}

/* Sizes */
.btn--full-width { width: 100%; }
.btn--sm,
.btn-sm {
  height: 36px;
  padding: 0 var(--space-4);
  font-size: var(--font-size-sm);
}

/* ================================================================
   Cards / Containers  (catalogue: .card, .card-padded, .surface-inset)
   ================================================================ */

.card {
  background-color: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.card-padded {
  background-color: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: var(--space-6);
}

.surface-inset {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-4);
}

/* ================================================================
   Badges  (catalogue: .badge + variant)
   ================================================================ */

.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.badge-success  { background-color: #DCFCE7; color: #166534; }
.badge-warning  { background-color: #FEF3C7; color: #92400E; }
.badge-error    { background-color: #FEE2E2; color: #991B1B; }
.badge-info     { background-color: #DBEAFE; color: #1E40AF; }
.badge-neutral  { background-color: #F1F5F9; color: #475569; }
.badge-purple   { background-color: #F3E8FF; color: #6B21A8; }

/* ================================================================
   App Shell
   ================================================================ */

.app-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--color-bg-secondary);
}

.app-content {
  flex: 1;
  max-width: 1024px;
  width: 100%;
  margin: 0 auto;
  padding: var(--space-8) var(--space-4);
}

@media (min-width: 768px) {
  .app-content {
    padding: var(--space-8) var(--space-6);
  }
}

/* ================================================================
   Page layout helpers  (catalogue: .page-header, .page-section)
   ================================================================ */

.page-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.page-title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
  margin: 0;
}

.section-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text-primary);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-4);
}

.section-label {
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-secondary);
}

.action-row {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-3);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
}

/* ================================================================
   Dashboard
   ================================================================ */

.dashboard-welcome {
  background: linear-gradient(135deg, var(--color-accent) 0%, #1D4ED8 100%);
  border-radius: var(--radius-md);
  padding: var(--space-8);
  color: #FFFFFF;
  margin-bottom: var(--space-6);
  position: relative;
  overflow: hidden;
}

.dashboard-welcome::after {
  content: "";
  position: absolute;
  top: -30px;
  right: -30px;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  pointer-events: none;
}

.dashboard-welcome-title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: #FFFFFF;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-1);
}

.dashboard-welcome-sub {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: var(--space-5);
}

.dashboard-role-chip {
  display: inline-flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-full);
  padding: 4px 14px;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: #FFFFFF;
}

.dashboard-card {
  background-color: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: var(--space-6);
}

.dashboard-heading {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.dashboard-role {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
}

.dashboard-content {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-6);
}

.dashboard-message {
  font-size: var(--font-size-lg);
  color: var(--color-text-primary);
  font-weight: 500;
}

/* ================================================================
   Tables  (catalogue: .table-card, .data-table)
   ================================================================ */

.table-card {
  background-color: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
}

.data-table th {
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-secondary);
  text-align: left;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-bg-secondary);
}

.data-table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  font-size: var(--font-size-sm);
  vertical-align: middle;
}

.data-table tr:last-child td { border-bottom: none; }

.data-table tbody tr:hover {
  background-color: var(--color-accent-subtle);
}

/* ================================================================
   Action links  (catalogue: .action-link, .action-link-danger)
   ================================================================ */

.action-link {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.action-link:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

.action-link-danger {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-destructive);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.action-link-danger:hover {
  color: var(--color-destructive-hover);
  text-decoration: underline;
}

/* ================================================================
   Empty state  (catalogue: .table-empty)
   ================================================================ */

.table-empty {
  text-align: center;
  font-style: italic;
  color: var(--color-text-muted);
  padding: var(--space-12) var(--space-4);
}