/* [DESIGN SYSTEM VARIANT v3 - INCHEON 3NO EXCLUSIVE WEBSITE]
   Theme: High-Contrast Premium Dark Obsidian Theme
   Base Palette: #0D0E10 (Main Obsidian Background), #E61E2E (Core Intense Red Tone)
*/

:root {
  --primary: #e61e2e;
  --primary-hover: #c51523;
  --tint-blue: rgba(230, 30, 46, 0.12);
  --bg-main: #0d0e10;
  --bg-alt: #070809;
  --bg-card: #141619;
  --text-main: #f5f6f8;
  --text-sub: #9fa2a7;
  --border: #22252a;
  --header-bg: rgba(13, 14, 16, 0.88);
  --header-bg-scroll: rgba(13, 14, 16, 0.99);
  --header-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
  --card-shadow: 0 15px 35px rgba(230, 30, 46, 0.15);
  --table-th-bg: #1a1d22;

  --radius-lg: 12px;
  --radius-md: 6px;
  --transition: all 0.25s cubic-bezier(0.25, 0.8, 0.25, 1);
}

body.light-theme {
  --bg-main: #fafafb;
  --bg-alt: #f1f3f5;
  --bg-card: #ffffff;
  --text-main: #1c1e21;
  --text-sub: #60656c;
  --border: #dddedf;
  --header-bg: rgba(250, 250, 251, 0.88);
  --header-bg-scroll: rgba(250, 250, 251, 0.99);
  --header-shadow: 0 6px 25px rgba(0, 0, 0, 0.06);
  --card-shadow: 0 12px 28px rgba(230, 30, 46, 0.08);
  --table-th-bg: #f1f3f5;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
  background-color: var(--bg-main);
  transition: background-color 0.25s ease;
}

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: "Noto Sans KR", sans-serif;
  line-height: 1.65;
  overflow-x: hidden;
  padding-top: 80px;
  transition:
    background-color 0.25s ease,
    color 0.25s ease;
}

/* Custom Indicator Utility floating toggle switcher button */
.theme-toggle-btn {
  position: fixed;
  top: 20px;
  right: 20px;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background-color: var(--primary);
  color: #ffffff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  z-index: 1100;
  transition: var(--transition);
  box-shadow: 0 5px 15px rgba(230, 30, 46, 0.4);
}
.theme-toggle-btn:hover {
  transform: scale(1.1) rotate(15deg);
  background-color: var(--primary-hover);
}

/* Structural Architecture Blueprint layout rule elements */
.section-container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  position: relative;
  z-index: 2;
}
section {
  padding: 95px 0;
  border-bottom: 1px solid var(--border);
  background-color: var(--bg-main);
  transition:
    background-color 0.25s ease,
    border-color 0.25s ease;
}
.prices-section,
.system-section,
.guide-section {
  background-color: var(--bg-alt);
}

h1,
h2,
h3,
h4 {
  font-weight: 700;
  color: var(--text-main);
  transition: color 0.25s ease;
  letter-spacing: -0.03em;
}
.section-header {
  text-align: center;
  margin-bottom: 55px;
}
.section-header h2 {
  font-size: 32px;
  margin-bottom: 12px;
  position: relative;
  display: inline-block;
}
.section-header h2::after {
  content: "";
  display: block;
  width: 50px;
  height: 3px;
  background: var(--primary);
  margin: 12px auto 0;
  border-radius: 1px;
}
.section-header p {
  font-size: 16px;
  color: var(--text-sub);
}

.seo-intro-text {
  font-size: 15px;
  color: var(--text-sub);
  line-height: 1.75;
  margin-bottom: 35px;
  text-align: center;
}
.center-text {
  text-align: center;
}
.margin-top-md {
  margin-top: 45px;
}
.margin-top-sm {
  margin-top: 25px;
}

/* Interactive Interface Action Units */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 30px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
}
.btn-primary {
  background-color: var(--primary);
  color: #ffffff;
  border: none;
}
.btn-primary:hover {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 7px 20px rgba(230, 30, 46, 0.35);
}

/* Grid Adaptive Flexboxes Components */
.grid-container {
  display: grid;
  gap: 24px;
}
.col-2 {
  grid-template-columns: repeat(2, 1fr);
}
.col-3 {
  grid-template-columns: repeat(3, 1fr);
}
.col-4 {
  grid-template-columns: repeat(4, 1fr);
}
.col-5 {
  grid-template-columns: repeat(5, 1fr);
}

@media (max-width: 1024px) {
  .col-4,
  .col-5 {
    grid-template-columns: repeat(2, 1fr);
  }
  .col-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 600px) {
  .col-2,
  .col-3,
  .col-4,
  .col-5 {
    grid-template-columns: 1fr;
  }
}

/* Sticky Header Layout Component */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 80px;
  background-color: var(--header-bg);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  transition: var(--transition);
}
.header-container {
  max-width: 1200px;
  height: 100%;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  font-size: 21px;
  font-weight: 900;
  color: var(--text-main);
  letter-spacing: -1px;
}
.logo-tel {
  color: var(--primary);
  text-decoration: none;
  margin-left: 10px;
  font-family: "Montserrat", sans-serif;
  font-weight: 800;
}
.main-nav ul {
  display: flex;
  list-style: none;
  gap: 14px;
}
.main-nav a {
  color: var(--text-sub);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  transition: var(--transition);
}
.main-nav a:hover {
  color: var(--primary);
}
.btn-nav-call {
  background-color: var(--primary);
  color: #ffffff;
  padding: 9px 18px;
  border-radius: 4px;
  text-decoration: none;
  font-weight: 700;
  font-size: 15px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
}
.btn-nav-call:hover {
  background-color: var(--primary-hover);
}
.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 22px;
  cursor: pointer;
}

/* Hero Visual Layout rules elements */
.hero-section {
  padding: 110px 0;
  overflow: hidden;
  background: radial-gradient(
    circle at 80% 20%,
    var(--tint-blue) 0%,
    transparent 65%
  );
}
.hero-layout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}
.hero-text {
  flex: 1.2;
}
.badge {
  display: inline-block;
  background-color: var(--tint-blue);
  color: var(--primary);
  padding: 5px 14px;
  border-radius: 3px;
  font-size: 12.5px;
  font-weight: 700;
  margin-bottom: 22px;
  border: 1px solid rgba(230, 30, 46, 0.25);
}
.hero-text h1 {
  font-size: 44px;
  line-height: 1.28;
  margin-bottom: 22px;
  font-weight: 900;
}
.hero-text h1 span {
  color: var(--primary);
}
.hero-text .subtext {
  font-size: 16.5px;
  color: var(--text-sub);
  margin-bottom: 35px;
}
.phone-display {
  margin-bottom: 35px;
}
.main-phone-link {
  font-family: "Montserrat", sans-serif;
  font-size: 40px;
  font-weight: 900;
  color: var(--primary);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: var(--transition);
}
.main-phone-link:hover {
  transform: translateY(-1px);
}

.hero-image {
  flex: 0.8;
  display: flex;
  justify-content: center;
}
.text-overlay-wrapper {
  width: 100%;
  max-width: 480px;
  aspect-ratio: 3/2;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  position: relative;
  background-color: #000;
}
.text-overlay-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.42;
  transition: transform 0.45s ease;
}
.text-overlay-wrapper:hover img {
  transform: scale(1.03);
}

/* Placement tag classes inside box elements */
.top-tag {
  position: absolute;
  top: 12px;
  left: 12px;
  right: 12px;
  background: rgba(0, 0, 0, 0.8);
  color: #fff;
  padding: 6px 12px;
  font-size: 12.5px;
  font-weight: 700;
  border-left: 3px solid var(--primary);
  border-radius: 2px;
  text-align: center;
  z-index: 5;
}
.center-accent {
  position: absolute;
  top: 52%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #e61e2e;
  font-size: 21px;
  font-weight: 900;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 1);
  text-align: center;
  width: 92%;
  z-index: 5;
  letter-spacing: -0.5px;
}
.bottom-tag {
  position: absolute;
  bottom: 12px;
  left: 12px;
  right: 12px;
  background: rgba(230, 30, 46, 0.92);
  color: #fff;
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 700;
  border-radius: 2px;
  text-align: center;
  z-index: 5;
}

/* Structural Cards Adaptive Modules */
.price-card,
.feature-card,
.course-card,
.room-card,
.staff-card,
.guide-box,
.rule-card,
.notice-box {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition:
    transform 0.25s cubic-bezier(0.25, 0.8, 0.25, 1),
    box-shadow 0.25s ease,
    border-color 0.25s ease,
    background-color 0.25s ease;
}

.price-card:hover,
.feature-card:hover,
.course-card:hover,
.room-card:hover,
.guide-box:hover,
.rule-card:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
  box-shadow: var(--card-shadow);
}

.price-card {
  padding: 40px 30px;
  text-align: center;
}
.price-card h3 {
  font-size: 19px;
  margin-bottom: 14px;
}
.price-card .amount {
  font-family: "Montserrat", sans-serif;
  font-size: 46px;
  font-weight: 900;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 16px;
}
.price-card .amount span {
  font-size: 19px;
  font-weight: 700;
  margin-left: 2px;
}
.price-card .desc {
  font-size: 15px;
  color: var(--text-sub);
}

.notice-box {
  padding: 32px;
  margin-top: 32px;
  border-left: 4px solid var(--primary);
}
.notice-box h4 {
  font-size: 17px;
  margin-bottom: 12px;
}
.notice-box p {
  font-size: 15px;
  color: var(--text-sub);
  margin-bottom: 16px;
}
.notice-box ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.notice-box li {
  font-size: 15px;
  color: var(--text-sub);
  padding-left: 18px;
  position: relative;
}
.notice-box li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--primary);
  font-weight: bold;
}

.feature-card {
  padding: 26px;
}
.icon-box {
  font-size: 24px;
  color: var(--primary);
  margin-bottom: 14px;
}
.feature-card h3 {
  font-size: 17.5px;
  margin-bottom: 8px;
}
.feature-card p {
  font-size: 15px;
  color: var(--text-sub);
  line-height: 1.55;
}

/* Informational Article layouts rules elements */
.system-content-box {
  display: flex;
  flex-direction: column;
  gap: 28px;
  max-width: 900px;
  margin: 0 auto;
}
.system-article {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 35px;
  border-radius: var(--radius-lg);
}
.system-article h3 {
  font-size: 19px;
  margin-bottom: 12px;
  border-left: 3px solid var(--primary);
  padding-left: 10px;
}
.system-article p {
  font-size: 14.5px;
  color: var(--text-sub);
  line-height: 1.75;
  text-align: justify;
}

.course-card {
  padding: 24px;
  position: relative;
}
.c-num {
  font-family: "Montserrat", sans-serif;
  font-size: 15px;
  font-weight: 900;
  color: var(--primary);
  background-color: var(--tint-blue);
  width: 34px;
  height: 34px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
}
.course-card h3 {
  font-size: 16px;
  margin-bottom: 8px;
}
.course-card p {
  font-size: 15px;
  color: var(--text-sub);
  line-height: 1.5;
}
.card-link-tel {
  color: var(--primary);
  text-decoration: none;
  font-weight: 700;
}

/* Promotional Segment layout classes elements */
.action-banner {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.action-banner-layout {
  display: flex;
  align-items: center;
  gap: 30px;
}
.action-banner-img {
  flex: 0.6;
  height: 210px;
}
.action-banner-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.action-banner-text {
  flex: 1.4;
  padding: 30px;
  padding-left: 0;
}
.action-banner-text h3 {
  font-size: 19px;
  margin-bottom: 8px;
  color: var(--primary);
}
.action-banner-text p {
  font-size: 15px;
  color: var(--text-sub);
  margin-bottom: 18px;
}
@media (max-width: 768px) {
  .action-banner-layout {
    flex-direction: column;
    gap: 0;
  }
  .action-banner-img {
    flex: none;
    width: 100%;
    height: 140px;
  }
  .action-banner-text {
    padding: 20px;
  }
}

.room-card {
  overflow: hidden;
}
.room-img {
  height: 155px;
  border-bottom: 1px solid var(--border);
}
.room-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.room-body {
  padding: 18px;
}
.room-body h3 {
  font-size: 15.5px;
  margin-bottom: 8px;
}
.room-body p {
  font-size: 15px;
  color: var(--text-sub);
  line-height: 1.5;
}

.staff-card {
  padding: 14px;
}
.staff-img {
  aspect-ratio: 1/1;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 10px;
  border: 1px solid var(--border);
}
.staff-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.staff-name {
  font-size: 14.5px;
  font-weight: 700;
}

.guide-box {
  padding: 32px;
}
.guide-title-bar {
  font-size: 17.5px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.guide-intro {
  font-size: 15px;
  color: var(--text-main);
  margin-bottom: 18px;
  font-weight: 500;
}
.step-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.step-list li {
  font-size: 15px;
  color: var(--text-sub);
  padding-left: 14px;
  position: relative;
}
.step-list li::before {
  content: "•";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--primary);
  font-size: 16px;
  line-height: 1;
}

.rule-card {
  padding: 24px;
  text-align: center;
}
.r-icon {
  font-size: 26px;
  color: var(--primary);
  margin-bottom: 14px;
}
.rule-card h3 {
  font-size: 15.5px;
  margin-bottom: 8px;
}
.rule-card p {
  font-size: 15px;
  color: var(--text-sub);
  line-height: 1.5;
}

/* Grid/Table Representation Rules elements */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-card);
}
.order-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 600px;
}
.order-table th {
  background-color: var(--table-th-bg);
  color: var(--primary);
  font-weight: 700;
  padding: 14px 20px;
  font-size: 15px;
  border-bottom: 2px solid var(--border);
}
.order-table td {
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  font-size: 15px;
  color: var(--text-sub);
}
.order-table tr:last-child td {
  border-bottom: none;
}
.type-title {
  font-weight: 700;
  color: var(--text-main);
  width: 25%;
}

/* FAQ Collapsible Items elements */
.faq-wrapper {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 24px;
  border-radius: var(--radius-md);
}
.faq-q {
  font-size: 15.5px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 10px;
  cursor: pointer;
}
.faq-a {
  font-size: 15px;
  color: var(--text-sub);
  line-height: 1.65;
  text-align: justify;
}

/* Lower Pitch Landing Capture Module structures */
.booking-banner-section {
  padding: 95px 0;
  background: linear-gradient(145deg, #040405 0%, #150204 100%);
  border-top: 2px solid var(--primary);
  border-bottom: none;
}
.split-layout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}
.booking-banner-left {
  flex: 1.3;
}
.brand-highlight {
  color: var(--primary);
}
.lead-text {
  font-size: 15.5px;
  color: var(--text-sub);
  margin-bottom: 28px;
}
.large-phone-wrap {
  margin-bottom: 22px;
}
.banner-tel-link {
  font-family: "Montserrat", sans-serif;
  font-size: 42px;
  font-weight: 900;
  color: #fff;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  transition: var(--transition);
}
.banner-tel-link i {
  color: var(--primary);
  animation: rattle 2.5s infinite;
}
.booking-banner-right {
  flex: 0.7;
  display: flex;
  justify-content: flex-end;
}
.ai-staff-avatar {
  width: 100%;
  max-width: 320px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 18px;
  text-align: center;
}
.ai-staff-avatar img {
  width: 100%;
  aspect-ratio: 1/1;
  object-fit: cover;
  border-radius: var(--radius-md);
  margin-bottom: 10px;
}
.avatar-tag {
  font-size: 15px;
  font-weight: 700;
  color: var(--primary);
}

@keyframes rattle {
  0%,
  100% {
    transform: rotate(0);
  }
  12%,
  32% {
    transform: rotate(-8deg);
  }
  22%,
  42% {
    transform: rotate(8deg);
  }
  52% {
    transform: rotate(0);
  }
}

/* Footer Copyright Definitions elements */
.site-footer {
  background-color: var(--bg-alt);
  padding: 55px 0 35px;
  font-size: 12.5px;
  border-top: 1px solid var(--border);
}
.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 20px;
}
.footer-brand {
  font-size: 18px;
  font-weight: 900;
  color: var(--text-main);
}
.footer-brand span {
  color: var(--primary);
}
.footer-links a {
  color: var(--text-sub);
  text-decoration: none;
  margin-left: 20px;
  transition: var(--transition);
  font-weight: 500;
}
.footer-links a:hover {
  color: var(--primary);
}
.footer-bottom .disclaimer {
  color: var(--text-sub);
  line-height: 1.6;
  margin-bottom: 22px;
  text-align: justify;
  opacity: 0.65;
}
.footer-bottom .copyright {
  color: #55585e;
  font-size: 11.5px;
}

/* Global Breakpoints Media Customizer */
@media (max-width: 991px) {
  .hero-layout,
  .split-layout {
    flex-direction: column;
    text-align: center;
    gap: 40px;
  }
  .hero-text h1 {
    font-size: 34px;
  }
  .main-phone-link {
    font-size: 30px;
  }
  .banner-tel-link {
    font-size: 32px;
  }
  .booking-banner-right,
  .hero-image {
    justify-content: center;
  }
  .main-nav,
  .header-cta {
    display: none;
  }
  .mobile-menu-toggle {
    display: block;
  }
  .header-container {
    padding-right: 20px;
  }
}