/* ============================================
   Alertmanager 온콜 라우트 빌더 — Styles
   Impeccable: Swiss/Grid, zero-decoration minimalism
   ============================================ */

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --ink: #000000;
  --canvas: #ffffff;
  --signal: #0052cc;
  --signal-hover: #003d99;
  --gray-100: #f5f5f5;
  --gray-200: #e5e5e5;
  --gray-300: #d4d4d4;
  --gray-500: #737373;
  --gray-700: #404040;
  --radius: 4px;
  --font: 'Pretendard', -apple-system, system-ui, sans-serif;
  --mono: 'JetBrains Mono', 'Menlo', monospace;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--canvas);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---- Hero ---- */
.hero {
  position: relative;
  min-height: 560px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-bg-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.72);
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 680px;
  padding: 64px 24px;
}

.hero-badge {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--canvas);
  border: 1px solid rgba(255,255,255,0.4);
  padding: 4px 16px;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: 48px;
  font-weight: 700;
  color: var(--canvas);
  line-height: 1.15;
  margin-bottom: 20px;
}

.hero-desc {
  font-size: 18px;
  color: rgba(255,255,255,0.85);
  margin-bottom: 32px;
  line-height: 1.7;
}

.hero-cta {
  display: inline-block;
  background: var(--signal);
  color: var(--canvas);
  font-family: var(--font);
  font-size: 16px;
  font-weight: 700;
  padding: 14px 40px;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s;
}

.hero-cta:hover {
  background: var(--signal-hover);
}

.hero-cta:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}

.hero-sub {
  margin-top: 16px;
  font-size: 14px;
  color: rgba(255,255,255,0.55);
}

/* ---- Features ---- */
.features {
  padding: 80px 0;
}

.feature-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

@media (min-width: 768px) {
  .feature-grid {
    grid-template-columns: 1fr 1fr 1fr;
    gap: 24px;
  }
}

.feature-card {
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 32px 24px;
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.feature-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.feature-icon {
  font-size: 28px;
  margin-bottom: 16px;
  color: var(--signal);
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 15px;
  color: var(--gray-700);
  line-height: 1.6;
}

/* ---- Builder ---- */
.builder {
  padding: 80px 0;
  background: var(--gray-100);
}

.section-title {
  font-size: 32px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 8px;
}

.section-desc {
  text-align: center;
  color: var(--gray-500);
  margin-bottom: 48px;
}

/* Steps */
.steps {
  display: flex;
  gap: 4px;
  margin-bottom: 40px;
  background: var(--canvas);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  overflow: hidden;
}

.step-btn {
  flex: 1;
  padding: 14px 8px;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 400;
  color: var(--gray-500);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.step-btn:hover {
  background: var(--gray-100);
}

.step-btn.active {
  background: var(--ink);
  color: var(--canvas);
  font-weight: 700;
}

/* Step panels */
.step-panel {
  display: none;
  background: var(--canvas);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 32px;
}

.step-panel.active {
  display: block;
}

.step-panel h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}

.step-hint {
  color: var(--gray-500);
  font-size: 14px;
  margin-bottom: 24px;
}

/* Forms */
.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 4px;
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 12px 12px;
  font-family: var(--font);
  font-size: 15px;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  background: var(--canvas);
  color: var(--ink);
  transition: border-color 0.15s;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--signal);
}

/* Receiver/Route/escalation cards */
.receiver-card,
.route-card,
.escalation-card {
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 12px;
  position: relative;
}

.receiver-card h4,
.route-card h4,
.escalation-card h4 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.receiver-fields {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

@media (min-width: 640px) {
  .receiver-fields {
    grid-template-columns: 1fr 1fr;
  }
}

.receiver-fields input,
.receiver-fields select {
  width: 100%;
  padding: 12px 12px;
  font-family: var(--font);
  font-size: 15px;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  background: var(--canvas);
  color: var(--ink);
}

.receiver-fields input:focus,
.receiver-fields select:focus {
  outline: none;
  border-color: var(--signal);
}

/* Route match fields */
.route-match {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-bottom: 12px;
}

@media (min-width: 640px) {
  .route-match {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

.route-match input,
.route-match select {
  width: 100%;
  padding: 12px 12px;
  font-family: var(--font);
  font-size: 15px;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  background: var(--canvas);
  color: var(--ink);
}

.route-match input:focus,
.route-match select:focus {
  outline: none;
  border-color: var(--signal);
}

/* Buttons */
.btn-primary {
  display: inline-block;
  background: var(--signal);
  color: var(--canvas);
  font-family: var(--font);
  font-size: 15px;
  font-weight: 700;
  padding: 12px 32px;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.15s;
}

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

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

.btn-primary:disabled {
  background: var(--gray-300);
  cursor: not-allowed;
}

.btn-secondary {
  display: inline-block;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font);
  font-size: 15px;
  font-weight: 400;
  padding: 10px 24px;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color 0.15s;
}

.btn-secondary:hover {
  border-color: var(--gray-500);
}

.btn-secondary:disabled {
  color: var(--gray-300);
  cursor: not-allowed;
}

.btn-small {
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 400;
  padding: 6px 16px;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color 0.15s;
}

.btn-small:hover {
  border-color: var(--gray-500);
}

.btn-remove {
  background: none;
  border: none;
  color: var(--gray-500);
  font-size: 18px;
  cursor: pointer;
  padding: 0 4px;
  line-height: 1;
  min-width: 44px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-remove:hover {
  color: #cc0000;
}

/* Output */
.output-tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--gray-200);
  margin-bottom: 0;
}

.output-tab {
  padding: 12px 20px;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 400;
  color: var(--gray-500);
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: color 0.15s;
}

.output-tab:hover {
  color: var(--ink);
}

.output-tab.active {
  color: var(--ink);
  font-weight: 700;
  border-bottom-color: var(--signal);
}

.output-panel {
  display: none;
}

.output-panel.active {
  display: block;
}

.output-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--gray-100);
  border: 1px solid var(--gray-200);
  border-bottom: none;
  border-radius: var(--radius) var(--radius) 0 0;
}

.output-header span {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--gray-500);
}

.output-header div {
  display: flex;
  gap: 8px;
}

.output-area pre {
  background: #1a1a2e;
  border: 1px solid var(--gray-200);
  border-radius: 0 0 var(--radius) var(--radius);
  padding: 20px;
  overflow-x: auto;
  margin: 0;
}

.output-area code {
  font-family: var(--mono);
  font-size: 13px;
  color: #e0e0e0;
  line-height: 1.7;
  white-space: pre;
}

.output-actions {
  display: flex;
  gap: 12px;
  margin-top: 24px;
  justify-content: center;
}

/* Step navigation */
.step-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--gray-200);
}

/* ---- Use cases ---- */
.usecases {
  padding: 80px 0;
}

.usecase-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-top: 48px;
}

@media (min-width: 768px) {
  .usecase-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

.usecase-card {
  padding: 32px 24px;
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.usecase-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.usecase-number {
  font-family: var(--mono);
  font-size: 36px;
  font-weight: 700;
  color: var(--gray-200);
  margin-bottom: 16px;
}

.usecase-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.usecase-card p {
  font-size: 15px;
  color: var(--gray-700);
  line-height: 1.6;
}

/* ---- CTA Section ---- */
.cta-section {
  padding: 80px 0;
  background: var(--ink);
  color: var(--canvas);
  text-align: center;
}

.cta-section h2 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 12px;
}

.cta-section p {
  color: rgba(255,255,255,0.7);
  margin-bottom: 32px;
}

a.cta-btn {
  background: var(--signal);
  color: var(--canvas);
}

.cta-btn:hover {
  background: var(--signal-hover);
}

/* ---- Footer ---- */
.footer {
  padding: 40px 0;
  border-top: 1px solid var(--gray-200);
  text-align: center;
}

.footer-brand {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 4px;
}

.footer p {
  font-size: 14px;
  color: var(--gray-500);
}

.footer-copy {
  margin-top: 16px;
  font-size: 13px;
  color: var(--gray-300);
}

/* ---- Toast ---- */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--ink);
  color: var(--canvas);
  font-size: 14px;
  padding: 12px 24px;
  border-radius: var(--radius);
  z-index: 1000;
  opacity: 0;
  transition: transform 0.3s ease, opacity 0.3s ease;
  pointer-events: none;
}

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

/* ---- Animations ---- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---- Responsive ---- */
@media (max-width: 767px) {
  .hero {
    min-height: 480px;
  }
  .hero h1 {
    font-size: 32px;
  }
  .hero-desc {
    font-size: 16px;
  }
  .section-title {
    font-size: 24px;
  }
  .steps {
    flex-wrap: wrap;
  }
  .step-btn {
    flex: 1 1 50%;
    font-size: 13px;
    padding: 10px 4px;
  }
  .step-panel {
    padding: 20px;
  }
}

/* Touch targets */
.btn-primary,
.btn-secondary,
.btn-small,
.step-btn,
.output-tab,
.hero-cta,
.cta-btn {
  min-height: 44px;
}

/* Focus states */
.btn-primary:focus-visible,
.btn-secondary:focus-visible,
.btn-small:focus-visible,
.step-btn:focus-visible,
.output-tab:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}