/* ========================================
   Cloud Voucher Eligibility Checker
   Design System — Impeccable Zero-Decoration
   ======================================== */

/* --- Design Tokens --- */
:root {
  --color-primary: #2563EB;
  --color-primary-hover: #1D4ED8;
  --color-primary-light: #EFF6FF;
  --color-success: #16A34A;
  --color-success-light: #F0FDF4;
  --color-warning: #CA8A04;
  --color-warning-light: #FEFCE8;
  --color-error: #DC2626;
  --color-error-light: #FEF2F2;
  --color-bg: #F8FAFC;
  --color-surface: #FFFFFF;
  --color-text: #1E293B;
  --color-text-secondary: #64748B;
  --color-border: #E2E8F0;
  --color-ink: #000000;
  --color-signal: #0052CC;
  --radius: 8px;
  --font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --text-hero: clamp(32px, 5vw, 48px);
  --text-heading: clamp(20px, 3vw, 24px);
  --text-body: 16px;
  --text-caption: 14px;
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;
  --max-width: 1120px;
  --transition: 200ms ease;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

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

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Accessibility */
.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;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  background: var(--color-primary);
  color: #fff;
  padding: 10px var(--spacing-md);
  z-index: 9999;
  font-weight: 700;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.skip-link:focus {
  top: 0;
}

/* --- Container --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* --- Animations --- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

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

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

@keyframes countUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes borderGlow {
  0%, 100% { border-color: var(--color-success); }
  50% { border-color: #22C55E; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* --- Header --- */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.logo-text {
  font-weight: 700;
  font-size: 18px;
  color: var(--color-text);
}

.logo-divider {
  width: 1px;
  height: 16px;
  background: var(--color-border);
}

.logo-sub {
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
}

.header-nav {
  display: flex;
  gap: var(--spacing-lg);
}

.header-nav a {
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
  font-weight: 400;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 4px;
}

.header-nav a:hover {
  color: var(--color-primary);
}

/* --- Hero Section --- */
.hero {
  padding: var(--spacing-3xl) 0;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.hero-title {
  font-size: var(--text-hero);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
  margin-bottom: var(--spacing-md);
  animation: fadeInUp 0.6s ease both;
}

.hero-subtitle {
  font-size: var(--text-heading);
  font-weight: 400;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
  animation: fadeInUp 0.6s ease 0.1s both;
}

.hero-subtitle strong {
  color: var(--color-primary);
  font-weight: 700;
}

.hero-stats {
  display: flex;
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-xl);
  animation: fadeInUp 0.6s ease 0.2s both;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.stat-value {
  font-size: 36px;
  font-weight: 700;
  line-height: 1;
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
}

.stat-unit {
  font-size: var(--text-caption);
  font-weight: 400;
  color: var(--color-text-secondary);
  margin-left: 2px;
}

.stat-label {
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
  margin-top: var(--spacing-xs);
}

.hero-note {
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
  margin-top: var(--spacing-md);
  animation: fadeInUp 0.6s ease 0.3s both;
}

.hero-image {
  border-radius: var(--radius);
  overflow: hidden;
  animation: fadeIn 0.8s ease 0.3s both;
}

.hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 4/3;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  font-family: var(--font-family);
  font-weight: 700;
  font-size: var(--text-body);
  padding: 12px 24px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
  min-height: 44px;
  line-height: 1;
}

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

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}

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

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-bg);
}

.btn-lg {
  padding: 16px 32px;
  font-size: 18px;
}

/* --- Features Section --- */
.features {
  padding: var(--spacing-3xl) 0;
}

.section-title {
  font-size: var(--text-heading);
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--spacing-2xl);
  color: var(--color-text);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

.feature-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--color-surface);
  transition: transform var(--transition), border-color var(--transition);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-primary);
}

.feature-card-inner {
  display: flex;
  flex-direction: column;
}

.feature-card-inner img {
  width: 100%;
  aspect-ratio: 3/2;
  object-fit: cover;
}

.feature-content {
  padding: var(--spacing-lg);
}

.feature-content h3 {
  font-size: var(--text-body);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.feature-content p {
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* --- Form Section --- */
.form-section {
  padding: var(--spacing-3xl) 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.form-wrapper {
  max-width: 640px;
  margin: 0 auto;
}

/* Step Indicator */
.step-indicator {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-2xl);
}

.step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
  opacity: 0.4;
  transition: opacity var(--transition);
}

.step.active {
  opacity: 1;
}

.step.completed {
  opacity: 0.7;
}

.step-number {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--color-border);
  border-radius: 50%;
  font-weight: 700;
  font-size: var(--text-caption);
  transition: all var(--transition);
}

.step.active .step-number {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.step.completed .step-number {
  border-color: var(--color-success);
  background: var(--color-success);
  color: #fff;
}

.step-label {
  font-size: 12px;
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.step-line {
  flex: 1;
  max-width: 60px;
  height: 2px;
  background: var(--color-border);
  margin-bottom: 20px;
}

/* Form Step */
.form-step {
  border: none;
  animation: fadeInUp 0.4s ease both;
}

.step-legend {
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
  font-weight: 400;
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-group > label {
  display: block;
  font-weight: 700;
  font-size: var(--text-caption);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.required {
  color: var(--color-error);
}

.optional {
  font-weight: 400;
  color: var(--color-text-secondary);
  font-size: 12px;
}

/* Select / Input */
select, input[type="email"] {
  width: 100%;
  padding: 12px var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-family: var(--font-family);
  font-size: var(--text-body);
  color: var(--color-text);
  background: var(--color-surface);
  transition: border-color var(--transition);
  min-height: 44px;
  -webkit-appearance: none;
  appearance: none;
}

select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748B' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

select:focus, input[type="email"]:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

select.error, input.error {
  border-color: var(--color-error);
}

select.error:focus, input.error:focus {
  box-shadow: 0 0 0 3px var(--color-error-light);
}

.field-error {
  font-size: 12px;
  color: var(--color-error);
  min-height: 16px;
  margin-top: var(--spacing-xs);
}

.field-hint {
  font-size: 12px;
  color: var(--color-text-secondary);
  margin-top: var(--spacing-xs);
}

/* Radio & Checkbox */
.radio-group {
  border: none;
}

.radio-group > legend {
  font-weight: 700;
  font-size: var(--text-caption);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.radio-options, .checkbox-options {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.radio-label, .checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  cursor: pointer;
  padding: 8px var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: all var(--transition);
  min-height: 44px;
  font-size: var(--text-caption);
}

.radio-label:hover, .checkbox-label:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.radio-label input, .checkbox-label input {
  accent-color: var(--color-primary);
  width: 18px;
  height: 18px;
}

.radio-label input:focus, .checkbox-label input:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Privacy */
.privacy-notice {
  background: var(--color-bg);
  padding: var(--spacing-md);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

.privacy-notice p {
  font-size: 12px;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* Form Navigation */
.form-nav {
  display: flex;
  justify-content: space-between;
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

.form-nav .btn {
  min-width: 120px;
}

/* Loading */
.loading-state {
  text-align: center;
  padding: var(--spacing-3xl) 0;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  margin: 0 auto var(--spacing-md);
  animation: spin 0.8s linear infinite;
}

.loading-text {
  font-size: var(--text-heading);
  font-weight: 700;
  color: var(--color-text);
}

.loading-sub {
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
  margin-top: var(--spacing-sm);
}

/* --- Result Section --- */
.result-section {
  padding: var(--spacing-3xl) 0;
}

.result-wrapper {
  max-width: 640px;
  margin: 0 auto;
  animation: fadeInUp 0.6s ease both;
}

/* Result Banner */
.result-banner {
  padding: var(--spacing-xl);
  border-radius: var(--radius);
  border: 2px solid;
  text-align: center;
  margin-bottom: var(--spacing-xl);
  animation: fadeInUp 0.5s ease both;
}

.result-banner.eligible {
  background: var(--color-success-light);
  border-color: var(--color-success);
}

.result-banner.conditional {
  background: var(--color-warning-light);
  border-color: var(--color-warning);
}

.result-banner.ineligible {
  background: var(--color-bg);
  border-color: var(--color-border);
}

.result-banner-icon {
  font-size: 48px;
  margin-bottom: var(--spacing-sm);
  line-height: 1;
}

.result-banner-title {
  font-size: var(--text-heading);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.result-banner-desc {
  font-size: var(--text-body);
  color: var(--color-text-secondary);
}

/* Amount Card */
.amount-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-xl);
  text-align: center;
  margin-bottom: var(--spacing-xl);
  animation: fadeInUp 0.5s ease 0.1s both;
}

.amount-label {
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.amount-value {
  font-size: 48px;
  font-weight: 700;
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
  animation: countUp 0.8s ease 0.3s both;
}

.amount-detail {
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
  margin-top: var(--spacing-sm);
}

/* Detail Sections */
.result-detail {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  animation: fadeInUp 0.5s ease 0.2s both;
}

.result-detail h3 {
  font-size: var(--text-body);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

.result-detail ul {
  list-style: none;
  padding: 0;
}

.result-detail li {
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--color-bg);
  font-size: var(--text-caption);
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
}

.result-detail li:last-child {
  border-bottom: none;
}

.result-detail li .icon {
  flex-shrink: 0;
  width: 20px;
  text-align: center;
}

/* Score breakdown */
.score-breakdown {
  margin-top: var(--spacing-md);
}

.score-item {
  display: flex;
  justify-content: space-between;
  padding: var(--spacing-sm) 0;
  font-size: var(--text-caption);
}

.score-item + .score-item {
  border-top: 1px solid var(--color-bg);
}

.score-item .label {
  color: var(--color-text-secondary);
}

.score-item .value {
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

/* Required checks */
.check-list li {
  padding: var(--spacing-sm) 0;
  font-size: var(--text-caption);
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
}

.check-list .check-icon {
  flex-shrink: 0;
  color: var(--color-text-secondary);
}

/* CTA Section */
.result-cta {
  margin-top: var(--spacing-2xl);
  padding: var(--spacing-xl);
  background: var(--color-surface);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius);
  text-align: center;
  animation: fadeInUp 0.5s ease 0.3s both;
}

.result-cta h3 {
  font-size: var(--text-body);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.result-cta p {
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
}

/* Share bar */
.share-bar {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-lg);
  justify-content: center;
  flex-wrap: wrap;
}

.share-bar .btn {
  font-size: var(--text-caption);
}

/* Ineligible tips */
.ineligible-tips {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-lg);
  margin-top: var(--spacing-lg);
  animation: fadeInUp 0.5s ease 0.3s both;
}

.ineligible-tips h3 {
  font-size: var(--text-body);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

.ineligible-tips ol {
  padding-left: var(--spacing-xl);
}

.ineligible-tips li {
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
  line-height: 1.5;
}

/* --- Footer --- */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-2xl) 0;
  margin-top: var(--spacing-3xl);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
  text-align: center;
}

.footer-brand .logo-text {
  font-size: var(--text-body);
}

.footer-desc {
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
  margin-top: var(--spacing-xs);
}

.footer-links {
  display: flex;
  gap: var(--spacing-lg);
}

.footer-links a {
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 4px;
}

.footer-copy {
  font-size: 12px;
  color: var(--color-text-secondary);
  max-width: 480px;
  line-height: 1.5;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }

  .hero-image {
    order: -1;
    max-height: 240px;
  }

  .features-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin: 0 auto;
  }
}

@media (max-width: 640px) {
  .hero {
    padding: var(--spacing-xl) 0;
  }

  .hero-stats {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .stat-item {
    flex-direction: row;
    align-items: baseline;
    gap: var(--spacing-sm);
  }

  .stat-label {
    margin-top: 0;
  }

  .header-nav {
    gap: var(--spacing-md);
  }

  .step-label {
    display: none;
  }

  .radio-options {
    flex-direction: column;
  }

  .form-nav {
    flex-direction: column;
  }

  .form-nav .btn {
    width: 100%;
  }

  .amount-value {
    font-size: 36px;
  }

  .footer-links {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
}