/* ===== KRDS Design Tokens ===== */
:root {
  /* Primary */
  --krds-primary-5:  #ecf2fe;
  --krds-primary-10: #d8e5fd;
  --krds-primary-20: #b1cefb;
  --krds-primary-30: #86aff9;
  --krds-primary-40: #4c87f6;
  --krds-primary-50: #256ef4;
  --krds-primary-60: #0b50d0;
  --krds-primary-70: #083891;
  --krds-primary-80: #052561;
  --krds-primary-90: #03163a;
  --krds-primary-95: #020f27;

  /* Secondary */
  --krds-secondary-5:  #eef2f7;
  --krds-secondary-10: #d6e0eb;
  --krds-secondary-20: #bacbde;
  --krds-secondary-30: #90b0d5;
  --krds-secondary-40: #6b96c7;
  --krds-secondary-50: #346fb2;
  --krds-secondary-60: #1c589c;
  --krds-secondary-70: #063a74;
  --krds-secondary-80: #052b57;
  --krds-secondary-90: #031f3f;
  --krds-secondary-95: #02162c;

  /* Gray */
  --krds-gray-0:   #ffffff;
  --krds-gray-5:   #f4f5f6;
  --krds-gray-10:  #e6e8ea;
  --krds-gray-20:  #cdd1d5;
  --krds-gray-30:  #b1b8be;
  --krds-gray-40:  #8a949e;
  --krds-gray-50:  #6d7882;
  --krds-gray-60:  #58616a;
  --krds-gray-70:  #464c53;
  --krds-gray-80:  #33363d;
  --krds-gray-90:  #1e2124;
  --krds-gray-95:  #131416;
  --krds-gray-100: #000000;

  /* Danger */
  --krds-danger-5:  #fdefec;
  --krds-danger-50: #d43a1c;
  --krds-danger-60: #b42d12;

  /* Warning */
  --krds-warning-5:  #fff3db;
  --krds-warning-50: #a16b00;

  /* Success */
  --krds-success-5:  #eaf6ec;
  --krds-success-10: #c8e6cc;
  --krds-success-40: #3da64e;
  --krds-success-50: #237d31;
  --krds-success-60: #146822;

  /* Information */
  --krds-info-5:  #e7f4fe;
  --krds-info-50: #1371ce;

  /* Shadow */
  --krds-shadow-1: 0 1px 3px #0000000d;
  --krds-shadow-2: 0 4px 12px #00000014;
  --krds-shadow-3: 0 8px 24px #0000001f;

  /* Radius (KRDS scale) */
  --krds-radius-xs: 0.2rem;
  --krds-radius-sm: 0.4rem;
  --krds-radius-md: 0.6rem;
  --krds-radius-lg: 1rem;
  --krds-radius-xl: 1.2rem;
  --krds-radius-full: 100rem;

  /* Border */
  --krds-border-regular: 0.1rem;
  --krds-border-medium: 0.2rem;

  /* Semantic aliases */
  --color-primary:    var(--krds-primary-50);
  --color-primary-hover: var(--krds-primary-60);
  --color-bg:         var(--krds-gray-5);
  --color-surface:    var(--krds-gray-0);
  --color-text:       var(--krds-gray-90);
  --color-text-secondary: var(--krds-gray-50);
  --color-text-tertiary:  var(--krds-gray-40);
  --color-border:     var(--krds-gray-10);
  --color-border-strong: var(--krds-gray-20);
  --color-success:    var(--krds-success-50);
  --color-hero-bg:    var(--krds-primary-90);
}

/* ===== Base ===== */
body {
  word-break: keep-all;
  overflow-wrap: break-word;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
}

/* ===== Sticky Nav ===== */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 0 1.5rem;
  transition: background 0.3s ease, box-shadow 0.3s ease;
}

.site-nav__inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  transition: height 0.3s ease;
}

.site-nav--scrolled {
  background: rgba(3, 22, 58, 0.92);
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  box-shadow: 0 1px 0 rgba(255,255,255,0.04), var(--krds-shadow-3);
}

.site-nav--scrolled .site-nav__inner {
  height: 56px;
}

.site-nav__brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.site-nav__links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.site-nav__link {
  font-size: 0.9375rem;
  font-weight: 400;
  color: rgba(255,255,255,0.72);
  text-decoration: none;
  transition: color 0.2s;
}

.site-nav__link:hover {
  color: #fff;
}

.site-nav__cta {
  font-size: 0.8125rem;
  font-weight: 700;
  color: #fff;
  background: var(--color-primary);
  padding: 0.5rem 1.25rem;
  border-radius: var(--krds-radius-md);
  text-decoration: none;
  transition: background 0.2s, transform 0.15s;
}

.site-nav__cta:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
}

/* Mobile nav */
.site-nav__toggle {
  display: none;
  background: none;
  border: none;
  color: white;
  cursor: pointer;
  padding: 4px;
}

@media (max-width: 767px) {
  .site-nav__links {
    display: none;
  }
  .site-nav__links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(3, 22, 58, 0.96);
    backdrop-filter: blur(16px);
    padding: 1rem 1.5rem 1.5rem;
    gap: 0;
    border-top: 1px solid rgba(255,255,255,0.06);
  }
  .site-nav__links.open .site-nav__link {
    padding: 0.75rem 0;
    border-bottom: 1px solid rgba(255,255,255,0.05);
  }
  .site-nav__links.open .site-nav__cta {
    margin-top: 0.75rem;
    text-align: center;
    display: block;
  }
  .site-nav__toggle {
    display: block;
  }
}

/* ===== Hero ===== */
.hero-grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(37, 110, 244, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37, 110, 244, 0.04) 1px, transparent 1px);
  background-size: 64px 64px;
}

.hero-screenshot-wrapper {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
}

.hero-screenshot-wrapper::before {
  content: '';
  position: absolute;
  inset: -40px;
  background: radial-gradient(ellipse at center, rgba(37, 110, 244, 0.15), transparent 70%);
  filter: blur(40px);
  z-index: 0;
  pointer-events: none;
}

.hero-screenshot-wrapper .screenshot-frame {
  position: relative;
  z-index: 1;
}

/* ===== Screenshot frame ===== */
.screenshot-frame {
  border-radius: var(--krds-radius-xl);
  overflow: hidden;
  box-shadow: var(--krds-shadow-3), 0 0 0 1px rgba(255, 255, 255, 0.06);
  background: var(--krds-gray-90);
}

.screenshot-frame__titlebar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  background: var(--krds-gray-95);
}

.screenshot-frame__dot {
  width: 12px;
  height: 12px;
  border-radius: var(--krds-radius-full);
}

.screenshot-frame__dot--red    { background: #FF5F57; }
.screenshot-frame__dot--yellow { background: #FFBD2E; }
.screenshot-frame__dot--green  { background: #28C840; }

.screenshot-frame__body {
  width: 100%;
  background: var(--krds-gray-90);
}

.screenshot-frame__body .screenshot-img {
  display: block;
  width: 100%;
  height: auto;
}

/* ===== Comparison Table ===== */
.compare-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  border-radius: var(--krds-radius-lg);
  overflow: hidden;
  box-shadow: var(--krds-shadow-1);
  border: var(--krds-border-regular) solid var(--color-border);
}

.compare-table th,
.compare-table td {
  padding: 0.875rem 1.25rem;
  text-align: center;
  font-size: 0.9375rem;
  border-bottom: var(--krds-border-regular) solid var(--krds-gray-5);
}

.compare-table thead th {
  background: var(--krds-gray-5);
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-text);
  padding: 1.125rem 1.25rem;
  border-bottom: var(--krds-border-medium) solid var(--color-border);
}

.compare-table thead th:first-child {
  text-align: left;
}

.compare-table tbody td:first-child {
  text-align: left;
  font-weight: 500;
  color: var(--krds-gray-60);
}

.compare-table tbody tr:last-child td {
  border-bottom: none;
}

.compare-table tbody tr:hover {
  background: var(--krds-gray-5);
}

.compare-table th.col-highlight {
  background: var(--color-primary);
  color: #fff;
}

.compare-table td.col-highlight {
  background: var(--krds-primary-5);
  font-weight: 600;
}

.compare-table .check { color: var(--color-success); font-size: 1.125rem; }
.compare-table .cross { color: var(--krds-danger-50); font-size: 1.125rem; opacity: 0.5; }

/* ===== Feature Grid ===== */
.feature-card {
  background: var(--color-surface);
  border-radius: var(--krds-radius-lg);
  padding: 1.5rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  border: var(--krds-border-regular) solid var(--color-border);
}

.feature-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--krds-shadow-2);
  border-color: var(--color-border-strong);
}

/* ===== Deep-dive blocks ===== */
.deepdive {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  align-items: center;
  padding: 2.5rem;
  border-radius: var(--krds-radius-xl);
  background: var(--color-surface);
  border: var(--krds-border-regular) solid var(--color-border);
}

@media (min-width: 1024px) {
  .deepdive {
    flex-direction: row;
  }
  .deepdive--reverse {
    flex-direction: row-reverse;
  }
  .deepdive__text {
    flex: 0 0 35%;
  }
  .deepdive__media {
    flex: 1;
  }
}

/* ===== Pricing ===== */
.pricing-card {
  background: var(--color-surface);
  border-radius: var(--krds-radius-xl);
  padding: 2.5rem 2rem;
  text-align: center;
  border: var(--krds-border-regular) solid var(--color-border);
  transition: transform 0.2s, box-shadow 0.2s;
  position: relative;
}

.pricing-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--krds-shadow-2);
}

.pricing-card--highlight {
  border: var(--krds-border-medium) solid var(--color-primary);
  box-shadow: 0 4px 24px rgba(37, 110, 244, 0.1);
}

.pricing-card__badge {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--color-primary);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 1rem;
  border-radius: var(--krds-radius-full);
}

.pricing-card__price {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--color-text);
  margin: 0.75rem 0;
}

.pricing-card__features {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 0;
  text-align: left;
}

.pricing-card__features li {
  padding: 0.5rem 0;
  font-size: 0.9375rem;
  color: var(--krds-gray-60);
  display: flex;
  align-items: center;
  gap: 0.625rem;
}

.pricing-card__features li::before {
  content: '\2713';
  font-weight: 700;
  color: var(--color-success);
  flex-shrink: 0;
}

/* ===== Contact ===== */
.contact-form {
  max-width: 560px;
  margin: 0 auto;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 0.875rem 1rem;
  border: var(--krds-border-regular) solid var(--color-border-strong);
  border-radius: var(--krds-radius-md);
  font-size: 0.9375rem;
  font-family: inherit;
  background: var(--color-surface);
  transition: border-color 0.2s, box-shadow 0.2s;
  color: var(--color-text);
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 110, 244, 0.12);
}

.contact-form textarea {
  resize: vertical;
  min-height: 120px;
}

/* ===== Scroll Reveal ===== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94),
              transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }

/* ===== Hover lift ===== */
.hover-lift {
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.hover-lift:hover {
  transform: translateY(-2px);
  box-shadow: var(--krds-shadow-2);
}

/* ===== Focus / accessibility ===== */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--krds-radius-xs);
}

/* ===== Section divider ===== */
.section-glow {
  position: relative;
}

.section-glow::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--color-border);
}

/* ===== KRDS Button Styles ===== */
.krds-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 700;
  font-family: inherit;
  border-radius: var(--krds-radius-md);
  transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
  cursor: pointer;
  text-decoration: none;
  border: none;
}

.krds-btn--lg {
  padding: 0.875rem 2rem;
  font-size: 1.0625rem;
}

.krds-btn--md {
  padding: 0.75rem 1.5rem;
  font-size: 0.9375rem;
}

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

.krds-btn--primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--krds-shadow-2);
}

.krds-btn--secondary {
  background: transparent;
  color: rgba(255,255,255,0.85);
  border: var(--krds-border-regular) solid rgba(255,255,255,0.25);
}

.krds-btn--secondary:hover {
  color: #fff;
  border-color: rgba(255,255,255,0.5);
}

.krds-btn--outline {
  background: transparent;
  color: var(--color-text);
  border: var(--krds-border-medium) solid var(--color-border-strong);
}

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

.krds-btn--success {
  background: var(--color-success);
  color: #fff;
}

.krds-btn--success:hover {
  background: var(--krds-success-60);
  transform: translateY(-1px);
  box-shadow: var(--krds-shadow-2);
}

.krds-btn--dark {
  background: var(--krds-gray-70);
  color: #fff;
}

.krds-btn--dark:hover {
  background: var(--krds-gray-80);
  transform: translateY(-1px);
}

/* ===== Icon badge (feature icons) ===== */
.icon-badge {
  width: 3rem;
  height: 3rem;
  border-radius: var(--krds-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ===== Template card (dark) ===== */
.template-card {
  background: rgba(3, 22, 58, 0.7);
  border: var(--krds-border-regular) solid rgba(255,255,255,0.08);
  border-radius: var(--krds-radius-lg);
  padding: 1.5rem;
  text-align: center;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.template-card:hover {
  transform: translateY(-2px);
  border-color: rgba(255,255,255,0.15);
  box-shadow: 0 8px 24px rgba(0,0,0,0.2);
}

/* ===== Problem Compare (HWP vs MD) ===== */
.problem-compare {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.problem-compare .screenshot-frame {
  max-height: 200px;
  overflow: hidden;
}

/* ===== Code Block (Problem section) ===== */
.code-block {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.8125rem;
  line-height: 1.6;
  padding: 1rem 1.25rem;
  color: var(--krds-gray-30);
  white-space: pre;
  overflow-x: auto;
}

.code-block--hwp {
  background: var(--krds-gray-80);
  color: var(--krds-gray-40);
  letter-spacing: 0.15em;
}

.code-block--md {
  background: var(--krds-gray-90);
  color: var(--krds-gray-20);
}

.code-block--md .code-keyword {
  color: var(--krds-primary-40);
}

.code-block--md .code-bold {
  color: #fff;
  font-weight: 700;
}

/* ===== Format Tag (Problem section) ===== */
.format-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.25rem 0.75rem;
  border-radius: var(--krds-radius-full);
  font-size: 0.8125rem;
  font-weight: 700;
}

.format-tag--danger {
  background: rgba(212, 58, 28, 0.1);
  color: var(--krds-danger-50);
}

.format-tag--success {
  background: rgba(35, 125, 49, 0.1);
  color: var(--krds-success-50);
}