/* ========================================
   AI DevOps Credit Hidden Cost Diagnostic
   Design: Impeccable zero-decoration minimalism
   Font: Pretendard (Korean-first)
   Colors: Canvas #ffffff, Ink #000000, Signal #0052cc
   Radius: 4px only. No gradients, no shadows, no purple.
   ======================================== */

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

/* Variables */
:root {
  --canvas: #ffffff;
  --ink: #000000;
  --signal: #0052cc;
  --signal-hover: #003d99;
  --border: #e5e5e5;
  --border-light: #f0f0f0;
  --text-secondary: #666666;
  --bg-alt: #fafafa;
  --warn: #d4380d;
  --radius: 4px;
  --font: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --mono: 'Pretendard', ui-monospace, 'SFMono-Regular', monospace;
}

/* Base */
html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

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;
}

/* Typography */
h1, h2, h3 {
  font-weight: 700;
  line-height: 1.2;
}

h1 { font-size: 48px; }
h2 { font-size: 32px; }
h3 { font-size: 20px; }

p { line-height: 1.7; }

.mono {
  font-family: var(--mono);
  text-align: right;
}

.accent {
  color: var(--signal);
}

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  background: var(--signal);
  color: var(--canvas);
  font-family: var(--font);
  font-size: 16px;
  font-weight: 700;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s, transform 0.1s;
  min-height: 48px;
  min-width: 44px;
}

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

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

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

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  font-weight: 700;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  text-decoration: none;
  transition: border-color 0.2s, transform 0.1s;
  min-height: 48px;
}

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

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

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

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav a {
  font-size: 14px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s;
  padding: 8px 4px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

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

.nav-cta {
  padding: 8px 20px;
  background: var(--signal);
  color: var(--canvas) !important;
  border-radius: var(--radius);
  font-weight: 700;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.nav-cta:hover {
  background: var(--signal-hover) !important;
}

/* ========================================
   Hero
   ======================================== */
.hero {
  padding: 80px 0 64px;
  overflow: hidden;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 700;
  color: var(--text-secondary);
  margin-bottom: 24px;
  animation: fadeSlideUp 0.6s ease-out;
}

.hero-title {
  margin-bottom: 24px;
  animation: fadeSlideUp 0.6s ease-out 0.1s both;
}

.hero-desc {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 40px;
  max-width: 480px;
  animation: fadeSlideUp 0.6s ease-out 0.2s both;
}

.hero .btn-primary {
  animation: fadeSlideUp 0.6s ease-out 0.3s both;
}

.hero-image {
  position: relative;
  animation: fadeSlideRight 0.8s ease-out 0.3s both;
}

.hero-image img {
  width: 100%;
  height: auto;
  aspect-ratio: 3/2;
  object-fit: cover;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: block;
}

.hero-image-float {
  position: absolute;
  bottom: 24px;
  left: -32px;
  background: var(--ink);
  color: var(--canvas);
  padding: 16px 24px;
  border-radius: var(--radius);
  animation: floatPulse 3s ease-in-out infinite;
}

.float-label {
  display: block;
  font-size: 12px;
  opacity: 0.7;
  margin-bottom: 4px;
}

.float-value {
  font-size: 32px;
  font-weight: 700;
  color: #ff6b6b;
}

/* ========================================
   Problem Strip
   ======================================== */
.problem-strip {
  padding: 48px 0;
  background: var(--ink);
  color: var(--canvas);
}

.problem-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.problem-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.problem-num {
  font-size: 40px;
  font-weight: 700;
  color: #ff6b6b;
  font-family: var(--mono);
}

.problem-label {
  font-size: 14px;
  opacity: 0.7;
}

/* ========================================
   Calculator
   ======================================== */
.calculator {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-title {
  margin-bottom: 16px;
}

.section-desc {
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
}

.calc-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

/* Input Panel */
.calc-input {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  background: var(--canvas);
}

.input-group {
  margin-bottom: 28px;
}

.input-group:last-child {
  margin-bottom: 0;
}

.input-label {
  display: block;
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 12px;
}

.input-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.range-input {
  flex: 1;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--border);
  border-radius: 2px;
  outline: none;
}

.range-input:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 4px;
  border-radius: 2px;
}

.range-input::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  background: var(--signal);
  border-radius: 50%;
  cursor: pointer;
}

.range-input::-moz-range-thumb {
  width: 20px;
  height: 20px;
  background: var(--signal);
  border-radius: 50%;
  cursor: pointer;
  border: none;
}

.range-value {
  min-width: 60px;
  text-align: right;
  font-weight: 700;
  font-family: var(--mono);
}

.text-input {
  flex: 1;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--mono);
  font-size: 16px;
  outline: none;
  transition: border-color 0.2s;
  min-height: 48px;
}

.text-input:focus {
  border-color: var(--signal);
  outline: 2px solid var(--signal);
  outline-offset: -2px;
}

.input-unit {
  font-size: 14px;
  color: var(--text-secondary);
}

/* Vendor Grid */
.vendor-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.vendor-btn {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--canvas);
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  min-height: 48px;
}

.vendor-btn:hover {
  border-color: var(--signal);
}

.vendor-btn[aria-pressed="true"] {
  border-color: var(--signal);
  background: #f0f5ff;
}

.vendor-name {
  font-size: 14px;
  font-weight: 700;
}

.vendor-price {
  font-size: 12px;
  color: var(--text-secondary);
  font-family: var(--mono);
  margin-top: 4px;
}

.btn-calc {
  width: 100%;
  margin-top: 28px;
}

/* Detail Inputs */
.detail-field {
  margin-bottom: 16px;
}

.detail-field label {
  display: block;
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-secondary);
}

.detail-field input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--mono);
  font-size: 14px;
  outline: none;
  min-height: 44px;
}

.detail-field input:focus {
  border-color: var(--signal);
  outline: 2px solid var(--signal);
  outline-offset: -2px;
}

/* Result Panel */
.calc-result {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  background: var(--bg-alt);
  min-height: 400px;
  position: sticky;
  top: 88px;
}

.result-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 336px;
  color: var(--text-secondary);
  text-align: center;
}

.placeholder-icon {
  font-size: 48px;
  margin-bottom: 16px;
  opacity: 0.3;
}

.result-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.result-title {
  font-size: 20px;
}

.result-date {
  font-size: 12px;
  color: var(--text-secondary);
}

.result-summary {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 24px;
}

.summary-card {
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--canvas);
}

.summary-card.main {
  grid-column: 1 / -1;
  background: var(--ink);
  color: var(--canvas);
  border-color: var(--ink);
}

.summary-card.warn {
  border-color: var(--warn);
}

.summary-label {
  display: block;
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.summary-card.main .summary-label {
  color: rgba(255,255,255,0.6);
}

.summary-value {
  display: block;
  font-size: 28px;
  font-weight: 700;
  font-family: var(--mono);
}

.summary-card.main .summary-value {
  color: var(--canvas);
}

.warn-value {
  color: var(--warn);
}

.summary-sub {
  display: block;
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 4px;
  font-family: var(--mono);
}

.summary-card.main .summary-sub {
  color: rgba(255,255,255,0.6);
}

/* Breakdown */
.result-breakdown {
  margin-bottom: 24px;
}

.breakdown-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-light);
  font-size: 14px;
}

.breakdown-item:last-child {
  border-bottom: none;
}

.breakdown-name {
  font-weight: 700;
}

.breakdown-cost {
  font-family: var(--mono);
  font-weight: 700;
}

.breakdown-hidden {
  color: var(--warn);
  font-size: 12px;
  font-family: var(--mono);
}

/* Hidden detail */
.result-hidden {
  margin-bottom: 24px;
  padding: 16px;
  background: #fff7e6;
  border: 1px solid #ffe58f;
  border-radius: var(--radius);
}

.hidden-title {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--warn);
}

.hidden-item {
  font-size: 13px;
  line-height: 1.6;
  padding: 4px 0;
  padding-left: 16px;
  position: relative;
}

.hidden-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  background: var(--warn);
  border-radius: 50%;
}

/* Result Actions */
.result-actions {
  display: flex;
  gap: 12px;
}

.result-actions .btn-primary,
.result-actions .btn-secondary {
  flex: 1;
  text-align: center;
  font-size: 14px;
  padding: 12px 16px;
}

/* ========================================
   Features
   ======================================== */
.features {
  padding: 80px 0;
  background: var(--bg-alt);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 64px;
}

.feature-card {
  padding: 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--canvas);
}

.feature-icon-box {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-title {
  font-size: 18px;
  margin-bottom: 12px;
}

.feature-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.feature-image-row {
  text-align: center;
}

.feature-image-row img {
  max-width: 100%;
  height: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  aspect-ratio: 3/2;
  object-fit: cover;
}

/* ========================================
   Vendor Table
   ======================================== */
.vendors {
  padding: 80px 0;
}

.vendor-table-wrap {
  overflow-x: auto;
}

.vendor-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.vendor-table th {
  text-align: left;
  padding: 16px;
  border-bottom: 2px solid var(--ink);
  font-weight: 700;
  font-size: 13px;
  white-space: nowrap;
}

.vendor-table td {
  padding: 16px;
  border-bottom: 1px solid var(--border);
}

.vendor-table tr:hover {
  background: var(--bg-alt);
}

.vendor-table .warn {
  color: var(--warn);
  font-weight: 700;
}

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

.cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 48px;
}

.cta-title {
  font-size: 32px;
  color: var(--canvas);
  margin-bottom: 8px;
}

.cta-desc {
  color: rgba(255,255,255,0.6);
}

.cta-actions {
  display: flex;
  gap: 16px;
  flex-shrink: 0;
}

.cta-actions .btn-primary {
  background: var(--canvas);
  color: var(--ink);
}

.cta-actions .btn-primary:hover {
  background: var(--bg-alt);
}

.cta-actions .btn-secondary {
  border-color: rgba(255,255,255,0.3);
  color: var(--canvas);
}

.cta-actions .btn-secondary:hover {
  border-color: var(--canvas);
}

/* ========================================
   Footer
   ======================================== */
.footer {
  padding: 48px 0;
  border-top: 1px solid var(--border);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-desc {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 4px;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 14px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s;
  padding: 8px 4px;
  min-height: 44px;
  min-width: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.footer-links a:hover {
  color: var(--ink);
}

.footer-copy {
  font-size: 12px;
  color: var(--text-secondary);
}

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

@keyframes fadeSlideRight {
  from {
    opacity: 0;
    transform: translateX(32px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes floatPulse {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
}

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Result animation */
@keyframes resultReveal {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.result-content.active {
  animation: resultReveal 0.5s ease-out;
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 768px) {
  h1 { font-size: 32px; }
  h2 { font-size: 24px; }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .hero-image {
    order: -1;
  }

  .hero-image-float {
    left: 16px;
    bottom: 16px;
  }

  .float-value {
    font-size: 24px;
  }

  .problem-grid {
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }

  .problem-num {
    font-size: 28px;
  }

  .calc-layout {
    grid-template-columns: 1fr;
  }

  .calc-result {
    position: static;
  }

  .vendor-grid {
    grid-template-columns: 1fr;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .cta-inner {
    flex-direction: column;
    text-align: center;
  }

  .cta-actions {
    flex-direction: column;
    width: 100%;
  }

  .footer-inner {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }

  .nav {
    gap: 16px;
  }

  .nav a:not(.nav-cta) {
    display: none;
  }

  .result-summary {
    grid-template-columns: 1fr;
  }

  .result-actions {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero {
    padding: 48px 0 32px;
  }

  .calculator {
    padding: 48px 0;
  }

  .features {
    padding: 48px 0;
  }

  .vendors {
    padding: 48px 0;
  }

  .cta-section {
    padding: 48px 0;
  }

  .vendor-table {
    font-size: 12px;
  }

  .vendor-table th,
  .vendor-table td {
    padding: 12px 8px;
  }
}