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

:root {
  --canvas: #ffffff;
  --ink: #000000;
  --signal: #0052cc;
  --signal-light: #e8f0fe;
  --border: #e5e5e5;
  --bg-alt: #f8f8f8;
  --korea-badge: #e8f4e8;
  --korea-text: #2d6a2d;
  --error: #c62828;
  --radius: 4px;
  --max-w: 1200px;
  --gap: 16px;
}

html {
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--canvas);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  overflow-x: hidden;
}

a { color: var(--signal); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; display: block; }
button, input, select, textarea { font: inherit; color: inherit; }
table { border-collapse: collapse; width: 100%; }

.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }
.num { text-align: right; font-variant-numeric: tabular-nums; }

/* Skip link */
.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  background: var(--signal);
  color: #fff;
  padding: 8px 16px;
  z-index: 100;
  font-weight: 700;
  border-radius: 0 0 var(--radius) 0;
}
.skip-link:focus { top: 0; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  font-weight: 700;
  font-size: 16px;
  border: 2px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s, transform 0.1s;
  min-height: 44px;
  text-decoration: none;
}
.btn:active { transform: scale(0.98); }
.btn--primary {
  background: var(--ink);
  color: var(--canvas);
  border-color: var(--ink);
}
.btn--primary:hover { background: #222; text-decoration: none; }
.btn--primary:focus-visible { outline: 3px solid var(--signal); outline-offset: 2px; }
.btn--ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--ink);
}
.btn--ghost:hover { background: var(--bg-alt); text-decoration: none; }
.btn--ghost:focus-visible { outline: 3px solid var(--signal); outline-offset: 2px; }
.btn--full { width: 100%; }
.btn--large { padding: 16px 32px; font-size: 18px; }

/* ===== Hero ===== */
.hero {
  padding: 80px 0 64px;
  border-bottom: 1px solid var(--border);
}
.hero__inner {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: 48px;
  align-items: center;
}
.hero__eyebrow {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--signal);
  margin-bottom: 16px;
}
.hero__title {
  font-size: 48px;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}
.hero__desc {
  font-size: 18px;
  line-height: 1.6;
  color: #444;
  margin-bottom: 32px;
  max-width: 520px;
}
.hero__actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.hero__image {
  position: relative;
  margin-top: 32px; /* Asymmetric offset */
}
.hero__image img {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  width: 100%;
}
.hero__credit {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  color: #5f6b7a;
}
.hero__credit a { color: #5f6b7a; }

/* ===== Features ===== */
.features {
  padding: 64px 0;
  background: var(--bg-alt);
}
.section-title {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 40px;
}
.section-desc {
  font-size: 16px;
  color: #444;
  margin-bottom: 32px;
  max-width: 680px;
}
.features__grid {
  display: grid;
  grid-template-columns: 5fr 4fr 3fr;
  gap: 24px;
  align-items: start;
}
.feature-card {
  background: var(--canvas);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.3s ease;
}
.feature-card:hover { transform: translateY(-4px); }
.feature-card--tall { }
.feature-card--tall .feature-card__image { height: 340px; }
.feature-card__image {
  height: 200px;
  overflow: hidden;
}
.feature-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.feature-card:hover .feature-card__image img { transform: scale(1.04); }
.feature-card__body { padding: 24px; }
.feature-card__title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}
.feature-card__desc {
  font-size: 14px;
  line-height: 1.6;
  color: #555;
}

/* ===== Calculator ===== */
.calculator {
  padding: 64px 0;
}
.calc-layout {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 40px;
  align-items: start;
}

/* Form */
.calc-form {
  position: sticky;
  top: 24px;
  background: var(--canvas);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
}
.form-group { margin-bottom: 24px; }
.form-label {
  display: block;
  font-weight: 700;
  font-size: 14px;
  margin-bottom: 8px;
}
.form-required { color: var(--error); }
.form-input, .form-select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--canvas);
  font-size: 16px;
  min-height: 44px;
  transition: border-color 0.2s;
}
.form-input:focus, .form-select:focus {
  outline: none;
  border-color: var(--signal);
  box-shadow: 0 0 0 3px var(--signal-light);
}
.form-input[aria-invalid="true"] { border-color: var(--error); }
.form-hint { display: block; font-size: 12px; color: #5f6b7a; margin-top: 4px; }
.form-fieldset { border: none; padding: 0; }
.radio-group { display: flex; flex-direction: column; gap: 8px; }
.radio-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  min-height: 44px;
}
.radio-item:hover { background: var(--bg-alt); }
.radio-item:has(input:checked) { border-color: var(--signal); background: var(--signal-light); }
.radio-item input[type="radio"] {
  margin-top: 4px;
  accent-color: var(--signal);
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}
.radio-text { display: flex; flex-direction: column; }
.radio-text strong { font-size: 14px; }
.radio-text small { font-size: 12px; color: #5f6b7a; }
.form-share { margin-top: 12px; }

/* Results */
.calc-results {
  min-height: 400px;
}
.results-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 400px;
  text-align: center;
  color: #5f6b7a;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 48px 24px;
}
.results-empty__icon { margin-bottom: 16px; }
.results-empty p { font-size: 16px; }

.results-summary {
  text-align: center;
  padding: 32px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 32px;
}
.results-summary__label {
  font-size: 14px;
  color: #5f6b7a;
  margin-bottom: 8px;
}
.results-summary__value {
  font-size: 48px;
  font-weight: 700;
  color: var(--signal);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}
.results-summary__provider {
  font-size: 18px;
  font-weight: 700;
  margin-top: 4px;
}

/* Chart */
.results-chart { margin-bottom: 32px; }
.chart-bar-row {
  display: grid;
  grid-template-columns: 140px 1fr 100px;
  gap: 12px;
  align-items: center;
  margin-bottom: 8px;
}
.chart-bar-label {
  font-size: 14px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}
.chart-bar-track {
  height: 32px;
  background: var(--bg-alt);
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
}
.chart-bar-fill {
  height: 100%;
  border-radius: var(--radius);
  transition: width 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  display: flex;
  align-items: center;
  padding-left: 8px;
  font-size: 12px;
  font-weight: 700;
  color: #fff;
  min-width: 0;
  width: 0;
}
.chart-bar-fill--lowest { background: var(--signal); }
.chart-bar-fill--normal { background: #6b7280; }
.chart-bar-fill--korea { background: var(--korea-text); }
.chart-bar-amount {
  font-size: 14px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  text-align: right;
}
.badge {
  display: inline-block;
  padding: 2px 8px;
  font-size: 11px;
  font-weight: 700;
  border-radius: var(--radius);
  white-space: nowrap;
}
.badge--korea { background: var(--korea-badge); color: var(--korea-text); }
.badge--global { background: var(--signal-light); color: var(--signal); }
.badge--onprem { background: #f0f0f0; color: #444; }
.badge--best { background: var(--signal); color: #fff; }

/* Table */
.results-table-wrap {
  overflow-x: auto;
  margin-bottom: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.results-table {
  font-size: 14px;
}
.results-table th {
  background: var(--bg-alt);
  font-weight: 700;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 12px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.results-table td {
  padding: 12px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.results-table tbody tr { transition: background 0.15s; }
.results-table tbody tr:hover { background: var(--bg-alt); }
.results-table tbody tr.is-lowest { background: var(--signal-light); }
.results-note {
  font-size: 12px;
  color: #5f6b7a;
}

/* ===== Methodology ===== */
.methodology {
  padding: 64px 0;
  background: var(--bg-alt);
}
.method-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.method-card {
  background: var(--canvas);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
}
.method-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 16px;
}
.method-card ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.method-card li {
  font-size: 14px;
  line-height: 1.5;
  padding-left: 16px;
  position: relative;
}
.method-card li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  background: var(--signal);
  border-radius: 50%;
}

/* ===== CTA Section ===== */
.cta-section {
  padding: 80px 0;
}
.cta-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 32px;
  padding: 48px 64px;
  background: var(--ink);
  color: var(--canvas);
  border-radius: var(--radius);
}
.cta-text h2 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
}
.cta-text p { font-size: 16px; opacity: 0.85; max-width: 520px; }
.cta-action { flex-shrink: 0; }
.cta-section .btn--primary {
  background: var(--canvas);
  color: var(--ink);
  border-color: var(--canvas);
}
.cta-section .btn--primary:hover { background: #e8e8e8; }

/* ===== Footer ===== */
.footer {
  padding: 32px 0;
  border-top: 1px solid var(--border);
  text-align: center;
}
.footer__copy { font-size: 14px; margin-bottom: 4px; }
.footer__note { font-size: 12px; color: #5f6b7a; }

/* ===== Animations ===== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
.anim-fade-up {
  opacity: 0;
  transform: translateY(24px);
}
.anim-fade-up.is-visible {
  animation: fadeUp 0.6s ease forwards;
}
.anim-delay-1 { animation-delay: 0.15s !important; }
.anim-delay-2 { animation-delay: 0.3s !important; }

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

@keyframes barGrow {
  from { width: 0; }
}

/* ===== Toast ===== */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--ink);
  color: var(--canvas);
  padding: 12px 24px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 700;
  z-index: 200;
  opacity: 0;
  transition: transform 0.3s ease, opacity 0.3s ease;
  pointer-events: none;
}
.toast.is-show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* ===== Responsive ===== */
@media (max-width: 960px) {
  .hero__inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .hero__title { font-size: 36px; }
  .hero__image { margin-top: 0; }
  .features__grid {
    grid-template-columns: 1fr;
  }
  .feature-card--tall .feature-card__image { height: 200px; }
  .calc-layout {
    grid-template-columns: 1fr;
  }
  .calc-form {
    position: static;
  }
  .method-grid {
    grid-template-columns: 1fr;
  }
  .cta-inner {
    flex-direction: column;
    text-align: center;
    padding: 40px 32px;
  }
}

@media (max-width: 640px) {
  .hero { padding: 48px 0 40px; }
  .hero__title { font-size: 28px; }
  .hero__desc { font-size: 16px; }
  .hero__actions { flex-direction: column; }
  .hero__actions .btn { width: 100%; }
  .section-title { font-size: 24px; }
  .calc-form { padding: 20px; }
  .results-summary__value { font-size: 36px; }
  .chart-bar-row {
    grid-template-columns: 100px 1fr 80px;
    gap: 8px;
  }
  .chart-bar-label { font-size: 12px; }
  .cta-text h2 { font-size: 22px; }
}