/* ==========================================================================
   World Lottery Number Generator - Stylesheet
   Modern, responsive, accessible, authentic lottery ball themes (2026)
   ========================================================================== */

:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-active: #1e40af;
  --primary-focus: rgba(37, 99, 235, 0.35);
  
  --bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
  --surface-bg: #ffffff;
  --surface-card: #ffffff;
  --surface-muted: #f8fafc;
  --surface-hover: #f1f5f9;
  
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-inverse: #ffffff;
  
  --border-light: #e2e8f0;
  --border-strong: #cbd5e1;
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.12), 0 8px 10px -6px rgba(0, 0, 0, 0.08);

  --ball-size: 44px;
  --ball-font-size: 1.05rem;
}

/* CSS Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans KR", "Noto Sans JP", sans-serif;
  color: var(--text-main);
  background: #f1f5f9;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Layout */
.app-layout {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-main {
  flex: 1;
  padding: 24px 16px 40px;
}

.generator-container {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Header (Requirement 3: English title & description) */
.app-header {
  background: var(--bg-gradient);
  color: var(--text-inverse);
  padding: 32px 20px;
  box-shadow: var(--shadow-md);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.header-content {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 16px;
}

.logo-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
  flex-shrink: 0;
}

.app-title {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: #ffffff;
  line-height: 1.25;
}

.app-intro {
  font-size: 0.95rem;
  color: #cbd5e1;
  margin-top: 4px;
}

.badge-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  font-size: 0.82rem;
  font-weight: 600;
  color: #e2e8f0;
  backdrop-filter: blur(8px);
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #10b981;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulseGreen 2s infinite;
}

@keyframes pulseGreen {
  0% {
    transform: scale(0.95);
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  }
  70% {
    transform: scale(1);
    box-shadow: 0 0 0 6px rgba(16, 185, 129, 0);
  }
  100% {
    transform: scale(0.95);
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
  }
}

/* Card Container */
.card {
  background: var(--surface-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  padding: 24px;
}

/* Config Grid */
.config-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.01em;
}

/* Static English Labels (Requirement 3) */
.static-english-label {
  color: #1e293b;
}

.select-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.select-wrapper::after {
  content: "";
  position: absolute;
  right: 14px;
  width: 8px;
  height: 8px;
  border-right: 2px solid #64748b;
  border-bottom: 2px solid #64748b;
  transform: rotate(45deg);
  pointer-events: none;
  transition: transform 0.2s ease;
}

.form-select {
  width: 100%;
  padding: 11px 36px 11px 14px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-main);
  background-color: var(--surface-muted);
  border: 1.5px solid var(--border-light);
  border-radius: var(--radius-md);
  appearance: none;
  cursor: pointer;
  transition: border-color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}

.form-select:hover {
  background-color: #ffffff;
  border-color: var(--border-strong);
}

.form-select:focus {
  outline: none;
  background-color: #ffffff;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-focus);
}

/* Action Bar */
.action-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--border-light);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-md);
  cursor: pointer;
  border: none;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  text-decoration: none;
  user-select: none;
}

.btn-icon {
  flex-shrink: 0;
}

.btn-primary {
  background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
  color: #ffffff;
  box-shadow: 0 4px 10px rgba(37, 99, 235, 0.25);
}

.btn-primary:hover:not(:disabled) {
  background: linear-gradient(135deg, #1d4ed8 0%, #1e40af 100%);
  box-shadow: 0 6px 14px rgba(37, 99, 235, 0.35);
  transform: translateY(-1px);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: 0 2px 6px rgba(37, 99, 235, 0.25);
}

.btn-secondary {
  background: #ffffff;
  color: #334155;
  border: 1.5px solid var(--border-strong);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--surface-hover);
  border-color: #94a3b8;
  color: #0f172a;
}

.btn-secondary:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  border-color: var(--border-light);
}

.btn-ghost {
  background: transparent;
  color: #64748b;
  border: 1.5px solid transparent;
}

.btn-ghost:hover {
  background: var(--surface-hover);
  color: #0f172a;
}

/* Rule Card */
.rule-card {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-left: 4px solid var(--primary);
  padding: 18px 20px;
}

.rule-icon-title {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #1e40af;
  margin-bottom: 6px;
}

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

.rule-heading {
  font-size: 0.95rem;
  font-weight: 700;
  color: #1e3a8a;
}

.rule-text {
  font-size: 0.9rem;
  line-height: 1.55;
  color: #475569;
}

/* Results Card */
.results-card {
  min-height: 240px;
}

.results-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-light);
}

.results-heading {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text-main);
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: #64748b;
  font-size: 0.95rem;
  background-color: var(--surface-muted);
  border-radius: var(--radius-md);
  border: 2px dashed #cbd5e1;
}

/* Results Container & Line Rows */
.results-container {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.result-row {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 16px 18px;
  background-color: #ffffff;
  border: 1.5px solid #e2e8f0;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  animation: slideInRow 0.35s ease backwards;
}

.result-row:hover {
  border-color: #cbd5e1;
  box-shadow: var(--shadow-md);
}

@keyframes slideInRow {
  0% {
    opacity: 0;
    transform: translateY(12px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

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

.result-line-title {
  font-size: 0.88rem;
  font-weight: 700;
  color: #475569;
  background-color: #f1f5f9;
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

.btn-copy-line {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-size: 0.8rem;
  font-weight: 600;
  color: #475569;
  background-color: #f8fafc;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-copy-line:hover {
  background-color: var(--surface-hover);
  color: #0f172a;
  border-color: #cbd5e1;
}

.btn-copy-line.copied {
  background-color: #ecfdf5;
  color: #059669;
  border-color: #a7f3d0;
}

.btn-copy-line .icon-svg {
  flex-shrink: 0;
}

/* Balls Container */
.balls-wrapper {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.balls-group {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.bonus-balls {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 8px;
  border-radius: var(--radius-md);
  background-color: rgba(241, 245, 249, 0.7);
  border: 1px dashed #cbd5e1;
}

.bonus-divider {
  font-size: 1.3rem;
  font-weight: 800;
  color: #94a3b8;
  margin: 0 4px;
  user-select: none;
}

.bonus-badge {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  color: #64748b;
  letter-spacing: 0.04em;
  margin-right: 4px;
}

/* ==========================================================================
   Lottery Ball 3D Styling & Theme Color Definitions
   ========================================================================== */

.lotto-ball {
  width: var(--ball-size);
  height: var(--ball-size);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: var(--ball-font-size);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  user-select: none;
  position: relative;
  flex-shrink: 0;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.22),
              inset 0 -3px 5px rgba(0, 0, 0, 0.3),
              inset 0 2px 4px rgba(255, 255, 255, 0.5);
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.lotto-ball:hover {
  transform: translateY(-2px) scale(1.06);
}

.ball-animate {
  animation: ballPop 0.4s cubic-bezier(0.34, 1.56, 0.64, 1) backwards;
}

@keyframes ballPop {
  0% {
    opacity: 0;
    transform: scale(0.3) rotate(-15deg);
  }
  75% {
    transform: scale(1.15) rotate(4deg);
  }
  100% {
    opacity: 1;
    transform: scale(1) rotate(0);
  }
}

/* Korea Lotto 6/45: Official 5-color range bands */
.ball-kr-1 {
  background: radial-gradient(circle at 35% 30%, #fef08a 0%, #facc15 45%, #ca8a04 100%);
  color: #451a03;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.4);
}

.ball-kr-11 {
  background: radial-gradient(circle at 35% 30%, #93c5fd 0%, #3b82f6 50%, #1d4ed8 100%);
  color: #ffffff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
}

.ball-kr-21 {
  background: radial-gradient(circle at 35% 30%, #fca5a5 0%, #ef4444 50%, #b91c1c 100%);
  color: #ffffff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
}

.ball-kr-31 {
  background: radial-gradient(circle at 35% 30%, #cbd5e1 0%, #64748b 50%, #334155 100%);
  color: #ffffff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
}

.ball-kr-41 {
  background: radial-gradient(circle at 35% 30%, #86efac 0%, #22c55e 50%, #15803d 100%);
  color: #ffffff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
}

/* US Powerball / Mega Millions / EuroJackpot: Pearlescent White Balls */
.ball-standard-white {
  background: radial-gradient(circle at 35% 30%, #ffffff 0%, #f1f5f9 60%, #cbd5e1 100%);
  color: #0f172a;
  border: 1px solid #cbd5e1;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.8);
}

/* US Powerball: Red Powerball */
.ball-powerball {
  background: radial-gradient(circle at 35% 30%, #f87171 0%, #dc2626 50%, #991b1b 100%);
  color: #ffffff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
  box-shadow: 0 4px 10px rgba(220, 38, 38, 0.4), inset 0 -3px 5px rgba(0, 0, 0, 0.3), inset 0 2px 4px rgba(255, 255, 255, 0.5);
}

/* US Mega Millions: Gold Mega Ball */
.ball-megaball {
  background: radial-gradient(circle at 35% 30%, #fde68a 0%, #f59e0b 50%, #b45309 100%);
  color: #451a03;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.5);
  box-shadow: 0 4px 10px rgba(245, 158, 11, 0.4), inset 0 -3px 5px rgba(0, 0, 0, 0.3), inset 0 2px 4px rgba(255, 255, 255, 0.5);
}

/* EuroMillions: Royal Blue main ball & Gold Star */
.ball-eu-blue {
  background: radial-gradient(circle at 35% 30%, #60a5fa 0%, #1d4ed8 50%, #1e3a8a 100%);
  color: #ffffff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
}

.ball-star {
  background: radial-gradient(circle at 35% 30%, #fef08a 0%, #eab308 50%, #a16207 100%);
  color: #451a03;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.5);
  border: 2px solid #fde047;
  box-shadow: 0 4px 10px rgba(234, 179, 8, 0.4), inset 0 -3px 5px rgba(0, 0, 0, 0.3), inset 0 2px 4px rgba(255, 255, 255, 0.6);
}

/* EuroJackpot: Euro Numbers Gold */
.ball-euro-gold {
  background: radial-gradient(circle at 35% 30%, #fed7aa 0%, #f97316 50%, #c2410c 100%);
  color: #ffffff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
}

/* UK Lotto */
.ball-uk-lotto {
  background: radial-gradient(circle at 35% 30%, #93c5fd 0%, #2563eb 50%, #1e40af 100%);
  color: #ffffff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
}

/* Japan LOTO 6 & LOTO 7 */
.ball-jp-main {
  background: radial-gradient(circle at 35% 30%, #fdba74 0%, #ea580c 50%, #9a3412 100%);
  color: #ffffff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
}

.ball-jp-bonus {
  background: radial-gradient(circle at 35% 30%, #f472b6 0%, #db2777 50%, #9d174d 100%);
  color: #ffffff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
}

/* Canada Lotto 6/49 */
.ball-ca-main {
  background: radial-gradient(circle at 35% 30%, #93c5fd 0%, #2563eb 50%, #1d4ed8 100%);
  color: #ffffff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
}

.ball-ca-bonus {
  background: radial-gradient(circle at 35% 30%, #fde047 0%, #ca8a04 50%, #854d0e 100%);
  color: #ffffff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
}

/* Australia Oz Lotto */
.ball-oz-main {
  background: radial-gradient(circle at 35% 30%, #fef08a 0%, #eab308 50%, #a16207 100%);
  color: #451a03;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.5);
}

.ball-oz-supp {
  background: radial-gradient(circle at 35% 30%, #5eead4 0%, #0d9488 50%, #115e59 100%);
  color: #ffffff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
}

/* Australia Powerball */
.ball-au-main {
  background: radial-gradient(circle at 35% 30%, #ffffff 0%, #f1f5f9 60%, #cbd5e1 100%);
  color: #0f172a;
  border: 1px solid #cbd5e1;
}

.ball-au-power {
  background: radial-gradient(circle at 35% 30%, #f87171 0%, #dc2626 50%, #7f1d1d 100%);
  color: #ffffff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

/* Brazil Mega-Sena: Signature Emerald Green */
.ball-megasena {
  background: radial-gradient(circle at 35% 30%, #6ee7b7 0%, #059669 50%, #064e3b 100%);
  color: #ffffff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
  box-shadow: 0 4px 10px rgba(5, 150, 105, 0.3), inset 0 -3px 5px rgba(0, 0, 0, 0.3), inset 0 2px 4px rgba(255, 255, 255, 0.5);
}

/* Singapore TOTO */
.ball-sg-main {
  background: radial-gradient(circle at 35% 30%, #7dd3fc 0%, #0284c7 50%, #075985 100%);
  color: #ffffff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
}

.ball-sg-bonus {
  background: radial-gradient(circle at 35% 30%, #fca5a5 0%, #e11d48 50%, #9f1239 100%);
  color: #ffffff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
}

/* South Africa PowerBall */
.ball-za-main {
  background: radial-gradient(circle at 35% 30%, #5eead4 0%, #0d9488 50%, #134e4a 100%);
  color: #ffffff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
}

.ball-za-power {
  background: radial-gradient(circle at 35% 30%, #f87171 0%, #ef4444 50%, #991b1b 100%);
  color: #ffffff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

/* Fallback generic balls */
.ball-standard {
  background: radial-gradient(circle at 35% 30%, #ffffff 0%, #e2e8f0 70%, #94a3b8 100%);
  color: #0f172a;
}

.ball-bonus {
  background: radial-gradient(circle at 35% 30%, #fca5a5 0%, #ef4444 60%, #b91c1c 100%);
  color: #ffffff;
}

/* ==========================================================================
   Toast Notification
   ========================================================================== */

.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(40px);
  background-color: rgba(15, 23, 42, 0.94);
  color: #ffffff;
  padding: 12px 24px;
  border-radius: var(--radius-full);
  font-size: 0.92rem;
  font-weight: 600;
  box-shadow: var(--shadow-xl);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.25s cubic-bezier(0.16, 1, 0.3, 1), transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 1000;
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  max-width: 90vw;
  text-align: center;
}

.toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ==========================================================================
   Footer
   ========================================================================== */

.app-footer {
  background: #ffffff;
  border-top: 1px solid var(--border-light);
  padding: 24px 20px;
  margin-top: auto;
}

.footer-content {
  max-width: 960px;
  margin: 0 auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-note {
  font-size: 0.88rem;
  color: #475569;
}

.footer-disclaimer {
  font-size: 0.8rem;
  color: #94a3b8;
  line-height: 1.5;
}

.footer-disclaimer kbd {
  font-family: monospace;
  background: #f1f5f9;
  padding: 2px 5px;
  border-radius: 4px;
  border: 1px solid #cbd5e1;
  color: #334155;
  font-size: 0.85em;
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */

@media (max-width: 640px) {
  :root {
    --ball-size: 38px;
    --ball-font-size: 0.92rem;
  }

  .app-main {
    padding: 16px 12px 32px;
  }

  .card {
    padding: 18px 14px;
  }

  .app-title {
    font-size: 1.35rem;
  }

  .app-intro {
    font-size: 0.85rem;
  }

  .action-bar {
    flex-direction: column;
  }

  .action-bar .btn {
    width: 100%;
  }

  .balls-wrapper {
    gap: 6px;
  }

  .balls-group {
    gap: 6px;
  }

  .bonus-balls {
    padding: 2px 4px;
    gap: 6px;
  }

  .bonus-badge {
    font-size: 0.65rem;
  }
}