/* ============================================================
   YIYOL — surv.co.kr-style light theme (shared across pages)
   ============================================================ */
:root {
  --sv-accent: #00b4d8;
  --sv-accent-dark: #0096b7;
  --sv-ink: #14202e;
  --sv-ink-soft: #51606f;
  --sv-line: #e4e9ef;
  --sv-bg: #ffffff;
  --sv-bg-soft: #f5f8fb;
  --sv-max: 1180px;
  --sv-nav-h: 64px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Apple SD Gothic Neo', Roboto, sans-serif;
  color: var(--sv-ink);
  background: var(--sv-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
h1, h2, h3, h4 { font-family: 'Poppins', 'Inter', sans-serif; line-height: 1.25; color: var(--sv-ink); }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
.sv-wrap { max-width: var(--sv-max); margin: 0 auto; padding: 0 1.5rem; }
[lang]:not([lang="ko"]) .ko-only,
[lang]:not([lang="en"]) .en-only { display: none !important; }

/* ===== Section heading ===== */
.sv-eyebrow {
  font-size: 0.72rem; font-weight: 700; letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--sv-accent); margin-bottom: 0.8rem;
}
.sv-section { padding: 6rem 0; }
.sv-section.alt { background: var(--sv-bg-soft); }
.sv-head { text-align: center; max-width: 720px; margin: 0 auto 3.5rem; }
.sv-head h2 { font-size: 2.2rem; font-weight: 800; letter-spacing: -0.02em; }
.sv-head p { margin-top: 1rem; color: var(--sv-ink-soft); font-size: 1.05rem; }

/* ===== Nav ===== */
.site-nav { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; background: rgba(255,255,255,0.9); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); border-bottom: 1px solid var(--sv-line); padding: 0 1.5rem; }
.site-nav-inner { max-width: var(--sv-max); margin: 0 auto; display: flex; align-items: center; justify-content: space-between; height: var(--sv-nav-h); }
.site-nav-brand { display: flex; align-items: baseline; gap: 0.6rem; }
.site-nav-logo { font-family: 'Poppins', sans-serif; font-size: 1.3rem; font-weight: 800; color: var(--sv-ink); letter-spacing: 0.02em; }
.site-nav-logo span { color: var(--sv-accent); }
.site-nav-since { font-size: 0.62rem; font-weight: 700; letter-spacing: 0.18em; color: var(--sv-ink-soft); border: 1px solid var(--sv-line); border-radius: 999px; padding: 0.15rem 0.55rem; }
.site-nav-right { display: flex; align-items: center; gap: 1.5rem; }
.site-nav-links { display: flex; align-items: center; gap: 1.6rem; }
.site-nav-links a { font-size: 0.9rem; font-weight: 600; color: var(--sv-ink); transition: color 0.2s; }
.site-nav-links a:hover { color: var(--sv-accent); }
.site-nav-links .nav-active { color: var(--sv-accent); }
.site-nav-links .nav-cta { background: var(--sv-accent); color: #fff !important; padding: 0.45rem 1rem; border-radius: 6px; transition: background 0.2s; }
.site-nav-links .nav-cta:hover { background: var(--sv-accent-dark); }
.lang-switch { position: relative; }
.lang-selector { background: #fff; border: 1px solid var(--sv-line); color: var(--sv-ink-soft); padding: 0.32rem 0.75rem; border-radius: 6px; font-size: 0.8rem; cursor: pointer; display: flex; align-items: center; gap: 0.4rem; }
.lang-selector:hover { border-color: var(--sv-accent); color: var(--sv-accent); }
.lang-selector .fa-chevron-down { font-size: 0.6rem; transition: transform 0.2s; }
.lang-switch.active .fa-chevron-down { transform: rotate(180deg); }
.lang-dropdown { position: absolute; top: calc(100% + 8px); right: 0; background: #fff; border: 1px solid var(--sv-line); border-radius: 8px; overflow: hidden; display: none; min-width: 120px; z-index: 1100; box-shadow: 0 10px 30px rgba(20,32,46,0.12); }
.lang-switch.active .lang-dropdown { display: block; }
.lang-option { display: block; padding: 0.55rem 1rem; font-size: 0.84rem; color: var(--sv-ink-soft); }
.lang-option:hover { background: var(--sv-bg-soft); color: var(--sv-ink); }
.lang-option.active { color: var(--sv-accent); font-weight: 700; }
.nav-hamburger { display: none; background: transparent; border: 0; padding: 0.4rem; color: var(--sv-ink); cursor: pointer; align-items: center; justify-content: center; border-radius: 6px; }
.nav-hamburger svg { width: 24px; height: 24px; display: block; }

/* ===== Buttons ===== */
.sv-btn { display: inline-flex; align-items: center; gap: 0.6rem; padding: 0.85rem 1.8rem; border-radius: 8px; font-weight: 700; font-size: 0.98rem; transition: all 0.2s; cursor: pointer; border: none; }
.sv-btn-primary { background: var(--sv-accent); color: #fff; }
.sv-btn-primary:hover { background: var(--sv-accent-dark); transform: translateY(-2px); }
.sv-btn-ghost { background: rgba(255,255,255,0.1); color: #fff; border: 1px solid rgba(255,255,255,0.4); }
.sv-btn-ghost:hover { background: rgba(255,255,255,0.2); transform: translateY(-2px); }
.sv-btn-white { background: #fff; color: var(--sv-ink); }
.sv-btn-white:hover { background: #e9f6fb; transform: translateY(-2px); }
.sv-btn-outline { background: #fff; color: var(--sv-ink); border: 1px solid var(--sv-line); }
.sv-btn-outline:hover { border-color: var(--sv-accent); color: var(--sv-accent); transform: translateY(-2px); }

/* ===== Hero (home) ===== */
.sv-hero {
  position: relative; min-height: 100vh; display: flex; align-items: center;
  background: radial-gradient(circle at 72% 28%, #18314c 0%, #0a1622 58%);
  color: #fff; text-align: center; padding: 7rem 1.5rem 4rem; overflow: hidden;
  perspective: 1700px;
}
/* Perspective-tilted dashboard backdrop */
.sv-hero-stage { position: absolute; inset: 0; z-index: 0; display: flex; align-items: center; justify-content: center; pointer-events: none; }
.sv-hero-dash {
  width: 100%; height: 100%; object-fit: cover; object-position: left top;
  opacity: 0.6;
}
.sv-hero-overlay { position: absolute; inset: 0; z-index: 1; pointer-events: none;
  background: linear-gradient(180deg, rgba(8,14,22,0.55) 0%, rgba(8,14,22,0.5) 45%, rgba(8,14,22,0.8) 100%);
}
.sv-hero-inner { position: relative; z-index: 2; max-width: 900px; margin: 0 auto; }
.sv-hero-eyebrow { font-size: 0.8rem; font-weight: 700; letter-spacing: 0.25em; text-transform: uppercase; color: #7fe7ff; margin-bottom: 1.5rem; }
.sv-hero h1 { font-size: 3rem; font-weight: 800; color: #fff; letter-spacing: -0.02em; line-height: 1.3; }
.sv-hero h1 .hl { color: #46d4f0; }
.sv-hero p { margin-top: 1.6rem; font-size: 1.2rem; color: rgba(255,255,255,0.85); font-weight: 400; }
.sv-hero-cta { margin-top: 2.6rem; display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.sv-scroll-hint { position: absolute; bottom: 1.8rem; left: 50%; transform: translateX(-50%); color: rgba(255,255,255,0.6); font-size: 1.1rem; animation: svBounce 2s infinite; }
@keyframes svBounce { 0%,100% { transform: translate(-50%, 0); } 50% { transform: translate(-50%, 8px); } }

/* ===== Page banner (sub-pages) ===== */
.sv-pagebanner {
  position: relative; margin-top: var(--sv-nav-h);
  background: linear-gradient(rgba(10,18,28,0.62), rgba(10,18,28,0.72)), url('../../img/nox-ui-002.jpeg') left top/cover no-repeat;
  color: #fff; text-align: center; padding: 5rem 1.5rem;
}
.sv-pagebanner h1 { color: #fff; font-size: 2.4rem; font-weight: 800; letter-spacing: -0.01em; }
.sv-pagebanner p { margin-top: 0.9rem; color: rgba(255,255,255,0.82); font-size: 1.05rem; }
.sv-breadcrumb { margin-top: 1.2rem; font-size: 0.82rem; color: rgba(255,255,255,0.7); letter-spacing: 0.02em; }
.sv-breadcrumb a:hover { color: #fff; }
.sv-breadcrumb i { font-size: 0.6rem; margin: 0 0.5rem; opacity: 0.6; }

/* ===== Sub-navigation tabs (sticky under main nav) ===== */
.sv-subnav { position: sticky; top: var(--sv-nav-h); z-index: 900; background: #fff; border-bottom: 1px solid var(--sv-line); }
.sv-subnav-inner { max-width: var(--sv-max); margin: 0 auto; display: flex; gap: 0.4rem; padding: 0 1.5rem; overflow-x: auto; -webkit-overflow-scrolling: touch; }
.sv-subnav-tab {
  flex: 0 0 auto; background: transparent; border: none; cursor: pointer;
  font-family: inherit; font-size: 0.92rem; font-weight: 600; color: var(--sv-ink-soft);
  padding: 1.05rem 1.2rem; border-bottom: 3px solid transparent; transition: color 0.2s, border-color 0.2s; white-space: nowrap;
}
.sv-subnav-tab:hover { color: var(--sv-ink); }
.sv-subnav-tab.active { color: var(--sv-accent); border-bottom-color: var(--sv-accent); }

/* ===== Tab panels ===== */
.sv-tabpanel { display: none; }
.sv-tabpanel.active { display: block; animation: svFadeIn 0.4s ease; }
@keyframes svFadeIn { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }

/* ===== Prose / content ===== */
.sv-prose { max-width: 860px; margin: 0 auto; }
.sv-prose .sv-eyebrow { text-align: left; }
.sv-prose h2 { font-size: 1.9rem; font-weight: 800; margin-bottom: 1rem; }
.sv-prose h3 { font-size: 1.3rem; font-weight: 700; margin: 2rem 0 0.6rem; }
.sv-prose p { color: var(--sv-ink-soft); font-size: 1.04rem; margin-bottom: 1rem; }
.sv-prose strong { color: var(--sv-ink); }

/* ===== Check list (used in prose & product detail) ===== */
.sv-check-list { margin-top: 1.4rem; display: grid; gap: 0.85rem; }
.sv-check-list li { display: flex; gap: 0.8rem; align-items: flex-start; color: var(--sv-ink-soft); }
.sv-check-list li strong { color: var(--sv-ink); }
.sv-check-list i { color: var(--sv-accent); margin-top: 0.35rem; width: 18px; text-align: center; flex-shrink: 0; }

/* ===== Product grid (home preview) ===== */
.sv-product-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
.sv-product-card {
  background: #fff; border: 1px solid var(--sv-line); border-radius: 16px; padding: 2.5rem 2rem;
  transition: all 0.25s; position: relative; overflow: hidden;
}
.sv-product-card::before { content: ""; position: absolute; left: 0; top: 0; height: 3px; width: 0; background: var(--sv-accent); transition: width 0.3s; }
.sv-product-card:hover { transform: translateY(-6px); box-shadow: 0 18px 40px rgba(20,32,46,0.1); border-color: transparent; }
.sv-product-card:hover::before { width: 100%; }
.sv-product-icon { width: 58px; height: 58px; border-radius: 14px; background: var(--sv-bg-soft); color: var(--sv-accent); display: flex; align-items: center; justify-content: center; font-size: 1.5rem; margin-bottom: 1.4rem; transition: all 0.25s; }
.sv-product-card:hover .sv-product-icon { background: var(--sv-accent); color: #fff; }
.sv-product-card h3 { font-size: 1.5rem; font-weight: 800; letter-spacing: 0.01em; }
.sv-product-card .sv-product-sub { color: var(--sv-accent); font-size: 0.82rem; font-weight: 700; margin-top: 0.2rem; }
.sv-product-card p { margin-top: 0.9rem; color: var(--sv-ink-soft); font-size: 0.95rem; }
.sv-product-tags { margin-top: 1.3rem; display: flex; flex-wrap: wrap; gap: 0.4rem; }
.sv-product-tags span { font-size: 0.72rem; font-weight: 600; color: var(--sv-ink-soft); background: var(--sv-bg-soft); border: 1px solid var(--sv-line); padding: 0.2rem 0.65rem; border-radius: 999px; }

/* ===== Product detail row (products page) ===== */
.sv-product-detail { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 3rem; align-items: center; }
.sv-product-detail.reverse { grid-template-columns: 1.1fr 0.9fr; }
.sv-product-detail.reverse .sv-product-detail-media { order: 2; }
.sv-product-detail-media {
  border-radius: 18px; overflow: hidden; background: var(--sv-bg-soft); border: 1px solid var(--sv-line);
  min-height: 280px; display: flex; align-items: center; justify-content: center; color: var(--sv-accent);
}
.sv-product-detail-media img { width: 100%; height: 100%; object-fit: cover; }
.sv-product-detail-media .sv-bigicon { font-size: 5rem; opacity: 0.85; }
.sv-product-detail-body h2 { font-size: 2rem; font-weight: 800; }
.sv-product-detail-body .sv-product-sub { color: var(--sv-accent); font-weight: 700; font-size: 0.9rem; margin-top: 0.3rem; }
.sv-product-detail-body p { color: var(--sv-ink-soft); margin-top: 1rem; font-size: 1.02rem; }

/* ===== About (home/company) ===== */
.sv-about { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: center; }
.sv-about-text h2 { font-size: 2.1rem; font-weight: 800; letter-spacing: -0.02em; }
.sv-about-text p { margin-top: 1.3rem; color: var(--sv-ink-soft); font-size: 1.02rem; }
.sv-about-points { margin-top: 1.8rem; display: grid; gap: 0.9rem; }
.sv-about-points li { display: flex; gap: 0.8rem; align-items: flex-start; font-size: 0.98rem; }
.sv-about-points i { color: var(--sv-accent); margin-top: 0.35rem; }
.sv-about-img { border-radius: 16px; overflow: hidden; box-shadow: 0 24px 60px rgba(20,32,46,0.18); border: 1px solid var(--sv-line); }
.sv-about-img img { width: 100%; height: 100%; object-fit: cover; }

/* ===== Solutions / use cases ===== */
.sv-case-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.3rem; }
.sv-grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.3rem; }
.sv-case-card { background: #fff; border: 1px solid var(--sv-line); border-radius: 14px; padding: 2rem 1.5rem; text-align: center; transition: all 0.25s; }
.sv-case-card:hover { transform: translateY(-5px); box-shadow: 0 16px 36px rgba(20,32,46,0.1); }
.sv-case-card i { font-size: 2rem; color: var(--sv-accent); margin-bottom: 1rem; }
.sv-case-card h4 { font-size: 1.1rem; font-weight: 700; }
.sv-case-card p { margin-top: 0.6rem; color: var(--sv-ink-soft); font-size: 0.9rem; }

/* ===== Case rows (solutions page) ===== */
.sv-case-rows { max-width: 980px; margin: 0 auto; display: grid; gap: 1.2rem; }
.sv-case-row { display: grid; grid-template-columns: 64px 1fr; gap: 1.4rem; align-items: center; background: #fff; border: 1px solid var(--sv-line); border-radius: 14px; padding: 1.6rem 1.8rem; transition: all 0.2s; }
.sv-case-row:hover { box-shadow: 0 12px 30px rgba(20,32,46,0.09); transform: translateY(-3px); }
.sv-case-row .sv-case-row-icon { width: 64px; height: 64px; border-radius: 14px; background: var(--sv-bg-soft); color: var(--sv-accent); display: flex; align-items: center; justify-content: center; font-size: 1.6rem; }
.sv-case-row h4 { font-size: 1.2rem; font-weight: 700; }
.sv-case-row p { color: var(--sv-ink-soft); margin-top: 0.35rem; font-size: 0.96rem; }

/* ===== Stats / why ===== */
.sv-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
.sv-stat { text-align: center; padding: 1.5rem 1rem; }
.sv-stat .sv-stat-num { font-family: 'Poppins', sans-serif; font-size: 2.4rem; font-weight: 800; color: var(--sv-accent); letter-spacing: -0.02em; }
.sv-stat .sv-stat-label { margin-top: 0.5rem; color: var(--sv-ink-soft); font-size: 0.95rem; font-weight: 600; }

/* ===== Video demo ===== */
.sv-video-wrap { max-width: 760px; margin: 0 auto; }
.sv-video { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; border-radius: 14px; border: 1px solid var(--sv-line); box-shadow: 0 18px 50px rgba(20,32,46,0.14); }
.sv-video iframe { position: absolute; top: 0; left: 0; width: 100%; height: 100%; border: none; }
.sv-video-more { text-align: center; margin-top: 1.6rem; }
.sv-video-more a { display: inline-flex; align-items: center; gap: 0.5rem; background: #fff; border: 1px solid var(--sv-line); color: var(--sv-ink); padding: 0.65rem 1.3rem; border-radius: 8px; font-size: 0.9rem; font-weight: 600; transition: all 0.2s; }
.sv-video-more a:hover { border-color: var(--sv-accent); color: var(--sv-accent); }

/* ===== Section "more" link ===== */
.sv-more-wrap { text-align: center; margin-top: 3rem; }
.sv-more { display: inline-flex; align-items: center; gap: 0.5rem; font-weight: 700; color: var(--sv-accent); font-size: 0.95rem; }
.sv-more i { transition: transform 0.2s; }
.sv-more:hover i { transform: translateX(4px); }

/* ===== CTA ===== */
.sv-cta { background: linear-gradient(135deg, #0a1622, #14202e); color: #fff; text-align: center; padding: 5.5rem 1.5rem; }
.sv-cta h2 { color: #fff; font-size: 2.2rem; font-weight: 800; }
.sv-cta p { margin-top: 1.1rem; color: rgba(255,255,255,0.8); font-size: 1.08rem; }
.sv-cta .sv-hero-cta { margin-top: 2.2rem; }

/* ===== Map / location ===== */
.sv-map { position: relative; height: 380px; border-radius: 16px; overflow: hidden; border: 1px solid var(--sv-line); box-shadow: 0 16px 40px rgba(20,32,46,0.1); background: var(--sv-bg-soft); z-index: 0; }
.sv-map iframe { width: 100%; height: 380px; border: 0; display: block; }
.sv-map-link { text-align: right; margin-top: 0.7rem; }
.sv-map-link a { display: inline-flex; align-items: center; gap: 0.4rem; font-size: 0.85rem; font-weight: 600; color: var(--sv-accent); }
.sv-map-link a:hover { color: var(--sv-accent-dark); }
.sv-map-pin { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -100%); z-index: 2; color: #e8453c; font-size: 2.4rem; pointer-events: none; filter: drop-shadow(0 3px 5px rgba(0,0,0,0.4)); }
.sv-contact-info { display: grid; gap: 0.8rem; margin-top: 1.6rem; }
.sv-contact-info li { display: flex; gap: 0.8rem; align-items: flex-start; color: var(--sv-ink-soft); }
.sv-contact-info i { color: var(--sv-accent); margin-top: 0.35rem; width: 18px; text-align: center; }

/* ===== Footer ===== */
.sv-footer { background: #0a1622; color: #9fb0c0; padding: 3rem 1.5rem; text-align: center; }
.sv-footer .sv-footer-info { font-size: 0.85rem; line-height: 1.9; }
.sv-footer .sv-footer-divider { margin: 0 0.6rem; opacity: 0.4; }
.sv-footer .sv-footer-copy { margin-top: 1.2rem; font-size: 0.8rem; color: #6c7d8e; }

/* ===== Scroll-fade ===== */
.sv-fade { opacity: 0; transform: translateY(28px); transition: opacity 0.7s ease, transform 0.7s ease; }
.sv-fade.visible { opacity: 1; transform: translateY(0); }

/* ===== Responsive ===== */
@media (max-width: 860px) {
  .site-nav .nav-hamburger { display: inline-flex; }
  .site-nav .site-nav-right {
    display: none; position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0.25rem;
    padding: 1rem 1.5rem 1.25rem; background: #fff;
    border-top: 1px solid var(--sv-line); border-bottom: 1px solid var(--sv-line);
    box-shadow: 0 12px 24px rgba(20,32,46,0.1);
  }
  .site-nav.is-mobile-open .site-nav-right { display: flex; }
  .site-nav.is-mobile-open .site-nav-links { flex-direction: column; align-items: stretch; gap: 0.1rem; width: 100%; }
  .site-nav.is-mobile-open .site-nav-links li { width: 100%; }
  .site-nav.is-mobile-open .site-nav-links a { display: block; padding: 0.65rem 0.25rem; font-size: 1rem; }
  .site-nav.is-mobile-open .lang-switch { align-self: flex-start; margin-top: 0.5rem; }

  .sv-about { grid-template-columns: 1fr; gap: 2.5rem; }
  .sv-case-grid { grid-template-columns: repeat(2, 1fr); }
  .sv-grid-3 { grid-template-columns: 1fr; }
  .sv-stats { grid-template-columns: repeat(2, 1fr); }
  .sv-product-detail, .sv-product-detail.reverse { grid-template-columns: 1fr; gap: 1.8rem; }
  .sv-product-detail.reverse .sv-product-detail-media { order: 0; }
}
@media (max-width: 600px) {
  .sv-section { padding: 4rem 0; }
  .sv-hero h1 { font-size: 2.1rem; }
  .sv-hero p { font-size: 1.05rem; }
  .sv-hero-cta { flex-direction: column; }
  .sv-btn { width: 100%; justify-content: center; }
  .sv-product-grid { grid-template-columns: 1fr; }
  .sv-head h2, .sv-about-text h2, .sv-cta h2, .sv-pagebanner h1 { font-size: 1.7rem; }
  .sv-case-row { grid-template-columns: 1fr; text-align: center; }
  .sv-case-row .sv-case-row-icon { margin: 0 auto; }
}