/* ============================================================
   RustDesk Lite — next.youngsam.net
   Tone: fastfind.kr 계열, 색은 시안→에메랄드 그라데이션으로 차별화
   ============================================================ */

:root {
  --accent: #06b6d4;
  --accent-2: #10b981;
  --accent-3: #14b8a6;
  --accent-soft: rgba(6, 182, 212, 0.12);
  --accent-glow: rgba(6, 182, 212, 0.35);

  --gradient: linear-gradient(135deg, #06b6d4 0%, #14b8a6 50%, #10b981 100%);
  --gradient-soft: linear-gradient(135deg, rgba(6,182,212,0.15), rgba(16,185,129,0.10));

  --radius: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --container: 1180px;
  --header-h: 64px;

  --t: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg:        #09090b;
  --bg-2:      #111114;
  --bg-card:   #18181b;
  --bg-elev:   #1f1f23;
  --border:    #27272a;
  --border-2:  #3f3f46;
  --text:      #fafafa;
  --text-2:    #a1a1aa;
  --text-3:    #71717a;
  --shadow:    0 20px 60px rgba(0,0,0,0.4);
  --shadow-sm: 0 4px 14px rgba(0,0,0,0.25);
  --banner-bg: linear-gradient(90deg, #06b6d4, #14b8a6, #10b981);
  --header-bg: rgba(9,9,11,0.72);
}

[data-theme="light"] {
  --bg:        #fafafa;
  --bg-2:      #ffffff;
  --bg-card:   #ffffff;
  --bg-elev:   #f4f4f5;
  --border:    #e4e4e7;
  --border-2:  #d4d4d8;
  --text:      #18181b;
  --text-2:    #52525b;
  --text-3:    #71717a;
  --shadow:    0 20px 60px rgba(0,0,0,0.08);
  --shadow-sm: 0 4px 14px rgba(0,0,0,0.05);
  --accent-soft: rgba(6,182,212,0.08);
  --banner-bg: linear-gradient(90deg, #0891b2, #0d9488, #059669);
  --header-bg: rgba(255,255,255,0.78);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: 'Pretendard Variable', 'Pretendard', 'Inter',
    -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.6;
  font-feature-settings: 'tnum' 1;
  -webkit-font-smoothing: antialiased;
  transition: background var(--t), color var(--t);
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.container-narrow { max-width: 820px; }

/* ============== 공지 배너 ============== */
.banner {
  background: var(--banner-bg);
  color: #fff;
  font-size: 14px;
  font-weight: 500;
  padding: 10px 16px;
  text-align: center;
  letter-spacing: -0.2px;
}

/* ============== 헤더 ============== */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--header-bg);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--border);
  transition: background var(--t), border-color var(--t);
}
.header-inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.logo {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.5px;
  display: inline-flex;
  align-items: baseline;
  gap: 4px;
}
.logo-accent {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.nav {
  display: flex;
  gap: 28px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-2);
}
.nav a { transition: color var(--t); }
.nav a:hover { color: var(--text); }
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.theme-toggle {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  border: 1px solid var(--border);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: border-color var(--t), background var(--t);
}
.theme-toggle:hover { border-color: var(--border-2); background: var(--bg-elev); }
[data-theme="dark"] .theme-icon-light { display: none; }
[data-theme="light"] .theme-icon-dark { display: none; }

.mobile-menu-toggle {
  display: none;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  border: 1px solid var(--border);
  font-size: 18px;
}
.nav-mobile {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 12px 24px 16px;
  border-bottom: 1px solid var(--border);
}
.nav-mobile a {
  padding: 10px 12px;
  border-radius: 10px;
  color: var(--text-2);
  font-weight: 500;
}
.nav-mobile a:hover { background: var(--bg-elev); color: var(--text); }
.nav-mobile.open { display: flex; }

/* ============== 버튼 ============== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.2px;
  cursor: pointer;
  transition: all var(--t);
  white-space: nowrap;
}
.btn svg { width: 18px; height: 18px; }
.btn-sm { padding: 8px 16px; font-size: 13px; border-radius: 10px; }
.btn-lg { padding: 16px 32px; font-size: 16px; border-radius: 14px; }

.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 6px 20px rgba(6,182,212,0.25);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(6,182,212,0.40);
}

.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border-2);
}
.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}

/* ============== 히어로 ============== */
.hero {
  position: relative;
  padding: 80px 0 100px;
  overflow: hidden;
  text-align: center;
}
.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}
.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.55;
  animation: float 20s ease-in-out infinite;
}
.blob1 {
  top: -10%; left: -8%;
  width: 480px; height: 480px;
  background: radial-gradient(circle, rgba(6,182,212,0.55), transparent 70%);
}
.blob2 {
  top: 20%; right: -10%;
  width: 520px; height: 520px;
  background: radial-gradient(circle, rgba(20,184,166,0.45), transparent 70%);
  animation-delay: -7s;
}
.blob3 {
  bottom: -15%; left: 30%;
  width: 460px; height: 460px;
  background: radial-gradient(circle, rgba(16,185,129,0.40), transparent 70%);
  animation-delay: -14s;
}
@keyframes float {
  0%, 100% { transform: translate(0,0) scale(1); }
  33%      { transform: translate(40px, -30px) scale(1.05); }
  66%      { transform: translate(-30px, 40px) scale(0.95); }
}
[data-theme="light"] .blob { opacity: 0.35; }

.hero-inner { position: relative; z-index: 1; }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 24px;
  border: 1px solid var(--border);
}

.hero-title {
  font-size: clamp(36px, 6.4vw, 68px);
  font-weight: 800;
  letter-spacing: -1.5px;
  line-height: 1.08;
  margin: 0 0 24px;
}
.gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-desc {
  font-size: clamp(16px, 1.7vw, 18px);
  color: var(--text-2);
  margin: 0 auto 36px;
  max-width: 640px;
}
.hero-cta {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 56px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  max-width: 760px;
  margin: 0 auto;
  padding: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}
.stat { text-align: center; }
.stat-num {
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -1px;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat-unit { font-size: 12px; color: var(--text-3); margin-top: -2px; }
.stat-label { font-size: 13px; color: var(--text-2); margin-top: 6px; font-weight: 500; }

/* ============== 섹션 공통 ============== */
.section {
  padding: 100px 0;
}
.section-alt {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.section-head {
  text-align: center;
  margin-bottom: 56px;
}
.section-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.5px;
  color: var(--accent);
  margin-bottom: 12px;
}
.section-title {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 800;
  letter-spacing: -1px;
  margin: 0 0 16px;
  line-height: 1.15;
}
.section-desc {
  color: var(--text-2);
  max-width: 580px;
  margin: 0 auto;
  font-size: 16px;
}
.badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  margin-left: 4px;
}

/* ============== 다운로드 ============== */
.download-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 32px;
}
.download-card {
  position: relative;
  padding: 36px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  transition: transform var(--t), border-color var(--t), box-shadow var(--t);
}
.download-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-2);
  box-shadow: var(--shadow);
}
.download-card-primary {
  border-color: var(--accent);
  background: linear-gradient(180deg, var(--accent-soft), var(--bg-card) 60%);
}
.download-card-primary::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: var(--gradient);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}
.download-card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 20px;
}
.download-icon {
  width: 56px; height: 56px;
  border-radius: 16px;
  background: var(--accent-soft);
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.download-icon svg { width: 28px; height: 28px; }
.download-badge {
  background: var(--gradient);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 999px;
}
.download-badge-soft {
  background: var(--accent-soft);
  color: var(--accent);
}
.download-title {
  font-size: 22px;
  font-weight: 700;
  margin: 0 0 4px;
  letter-spacing: -0.4px;
}
.download-sub {
  font-size: 14px;
  color: var(--text-2);
  margin: 0 0 20px;
}
.download-features {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  font-size: 14px;
  color: var(--text-2);
}
.download-features li {
  padding: 6px 0;
}
.download-btn {
  width: 100%;
  margin-bottom: 16px;
}
.download-meta {
  font-size: 11px;
  color: var(--text-3);
  word-break: break-all;
  font-family: ui-monospace, 'SF Mono', Menlo, Monaco, Consolas, monospace;
  background: var(--bg-elev);
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
}
.download-meta code { font-size: 11px; }

.download-secondary {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  padding-top: 16px;
}
.download-secondary-label {
  font-size: 13px;
  color: var(--text-2);
  font-weight: 600;
}
.link-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  transition: all var(--t);
}
.link-pill small { color: var(--text-3); font-weight: 400; }
.link-pill:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}

/* ============== 기능 ============== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.feature-card {
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: transform var(--t), border-color var(--t);
}
.feature-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-2);
}
.feature-icon {
  font-size: 32px;
  margin-bottom: 16px;
}
.feature-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 8px;
  letter-spacing: -0.3px;
}
.feature-card p {
  font-size: 14px;
  color: var(--text-2);
  margin: 0;
  line-height: 1.65;
}

/* ============== 사용법 ============== */
.how-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.how-step {
  text-align: center;
  padding: 36px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}
.how-num {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient);
  color: #fff;
  font-weight: 800;
  font-size: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  box-shadow: 0 6px 20px var(--accent-glow);
}
.how-step h3 {
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 8px;
}
.how-step p {
  color: var(--text-2);
  font-size: 14px;
  margin: 0;
}

/* ============== FAQ ============== */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.faq-list details {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 22px;
  transition: border-color var(--t);
}
.faq-list details[open] {
  border-color: var(--border-2);
}
.faq-list summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 15px;
  letter-spacing: -0.2px;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after {
  content: '+';
  font-size: 22px;
  color: var(--accent);
  font-weight: 400;
  transition: transform var(--t);
}
.faq-list details[open] summary::after {
  content: '−';
}
.faq-list details > div {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  color: var(--text-2);
  font-size: 14px;
  line-height: 1.7;
}

/* ============== 푸터 ============== */
.footer {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  padding-top: 56px;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 40px;
}
.footer-col h4 {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--text-3);
  margin: 0 0 16px;
}
.footer-col a {
  display: block;
  color: var(--text-2);
  font-size: 14px;
  padding: 4px 0;
  transition: color var(--t);
}
.footer-col a:hover { color: var(--text); }
.footer-tagline {
  font-size: 14px;
  color: var(--text-2);
  margin: 12px 0 0;
}
.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 20px 0;
}
.footer-bottom .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--text-3);
}

/* ============== 반응형 ============== */
@media (max-width: 880px) {
  .nav { display: none; }
  .mobile-menu-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .header-actions .btn-sm { display: none; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .section { padding: 72px 0; }
  .hero { padding: 56px 0 72px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); padding: 20px; gap: 16px; }
  .download-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .how-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom .container { flex-direction: column; gap: 8px; }
}

/* ============== 스크롤 페이드 ============== */
.fade-in { opacity: 0; transform: translateY(20px); transition: opacity 0.7s ease, transform 0.7s ease; }
.fade-in.is-visible { opacity: 1; transform: translateY(0); }