/* ── 로그인 전 소개(랜딩) 화면 ───────────────────────────────────────────
 * web/js/landing.js. 색은 styles.css :root 토큰(블루→인디고 accent, 시안 accent-2, 등급 쿨톤 램프)만 쓴다.
 * 로그인 전에는 셸이 없으니 main의 폭 제한을 풀고 섹션이 직접 폭을 정한다.
 */
body[data-landing] main { max-width: none; padding: 0; }
body[data-landing] .st-body { padding-bottom: 0; }
body[data-landing] .site-footer { max-width: 1120px; margin: 0 auto; padding: 28px 24px 40px; }
.login-back { text-align: center; margin: 14px 0 0; font-size: 13px; }
.login-back a { color: var(--color-accent-700); text-decoration: none; }
.login-back a:hover { text-decoration: underline; }

.lp-nav {
  position: sticky; top: 0; z-index: 20;
  background: rgba(255, 255, 255, .86); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-neutral-200);
}
.lp-nav-inner { max-width: 1120px; margin: 0 auto; padding: 12px 24px; display: flex; align-items: center; gap: 28px; }
.lp-brand { display: inline-flex; align-items: center; gap: 10px; color: var(--color-text); text-decoration: none; }
.lp-nav-links { display: flex; gap: 4px; flex: 1; }
.lp-link {
  border: 0; background: transparent; cursor: pointer; white-space: nowrap;
  font: 500 14px/1 var(--font-body); color: var(--color-text-muted);
  padding: 9px 12px; border-radius: var(--radius-md);
}
.lp-link:hover { background: var(--color-neutral-100); color: var(--color-text); }

.lp-btn {
  display: inline-flex; align-items: center; justify-content: center; white-space: nowrap; cursor: pointer;
  font: 600 15px/1 var(--font-body); height: 46px; padding: 0 24px;
  border-radius: var(--radius-lg); border: 1px solid transparent;
}
.lp-btn:disabled { opacity: .5; cursor: not-allowed; }
.lp-btn-primary { background: var(--color-accent-gradient); color: #fff; box-shadow: 0 6px 18px rgba(37, 99, 235, .28); }
.lp-btn-primary:not(:disabled):hover { filter: brightness(1.07); }
.lp-btn-ghost { background: #fff; color: var(--color-accent-700); border-color: var(--color-accent-300); }
.lp-btn-ghost:not(:disabled):hover { background: var(--color-accent-100); }
.lp-btn-sm { height: 38px; padding: 0 18px; font-size: 14px; box-shadow: none; }
.lp-btn:focus-visible, .lp-link:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }

.lp-eyebrow { margin: 0 0 10px; font: 600 13px/1.2 var(--font-body); letter-spacing: .04em; color: var(--color-accent-700); }
.lp-grad { background: var(--color-accent-gradient); -webkit-background-clip: text; background-clip: text; color: transparent; }

.lp-hero {
  background: linear-gradient(135deg, #eef2ff 0%, #eff6ff 45%, #ecfeff 100%);
  padding: 72px 24px 80px; overflow: hidden;
}
.lp-hero-inner { max-width: 760px; margin: 0 auto; text-align: center; }
.lp-hero h1 { font: 700 clamp(32px, 5.4vw, 58px)/1.18 var(--font-heading); letter-spacing: -.02em; margin: 0 0 18px; overflow-wrap: anywhere; }
.lp-hero-sub { font-size: clamp(16px, 2vw, 19px); line-height: 1.65; color: var(--color-text-muted); margin: 0 auto 28px; max-width: 620px; }
.lp-cta { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; }
.lp-hero-note { margin: 14px 0 0; font-size: 13px; color: var(--color-neutral-600); }
.lp-hero-visual { max-width: 760px; margin: 52px auto 0; }

.lp-mock { padding: 0; overflow: hidden; border-radius: 14px; box-shadow: var(--shadow-lg); text-align: left; }
.lp-mock-bar { display: flex; align-items: center; gap: 6px; padding: 11px 16px; background: var(--color-neutral-100); border-bottom: 1px solid var(--color-neutral-200); }
.lp-dot { width: 10px; height: 10px; border-radius: 99px; background: var(--color-neutral-400); }
.lp-mock-title { margin-left: 8px; font: 600 13px/1 var(--font-body); color: var(--color-neutral-700); }
.lp-sample-tag { margin-left: auto; font-size: 11px; padding: 3px 8px; border-radius: 99px; background: var(--color-accent-100); color: var(--color-accent-800); white-space: nowrap; }
.lp-mock-body { padding: 20px; display: grid; gap: 14px; }
.lp-seg { display: flex; height: 12px; border-radius: 99px; overflow: hidden; gap: 2px; }
.lp-seg-legend { display: flex; flex-wrap: wrap; gap: 6px 16px; font-size: 12px; color: var(--color-neutral-700); }
.lp-seg-legend span { display: inline-flex; align-items: center; gap: 6px; white-space: nowrap; }
.lp-seg-legend i { width: 9px; height: 9px; border-radius: 3px; display: inline-block; }
.lp-comments { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.lp-comments li { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border: 1px solid var(--color-neutral-200); border-radius: 10px; background: #fff; }
.lp-avatar { width: 28px; height: 28px; flex: none; border-radius: 99px; display: grid; place-items: center; background: var(--color-accent-100); color: var(--color-accent-700); font-size: 12px; font-weight: 700; }
.lp-comment-text { flex: 1; min-width: 0; font-size: 14px; line-height: 1.45; overflow-wrap: anywhere; }
.lp-badge { flex: none; white-space: nowrap; font: 600 12px/1 var(--font-body); padding: 5px 9px; border-radius: 99px; border: 1px solid transparent; }
.lp-reply { border: 1px dashed var(--color-accent-300); background: var(--color-accent-100); border-radius: 10px; padding: 12px 14px; }
.lp-reply-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; font-size: 13px; }
.lp-pill { font-size: 12px; padding: 3px 9px; border-radius: 99px; background: #fff; color: var(--color-accent-800); border: 1px solid var(--color-accent-300); white-space: nowrap; }
.lp-reply p { margin: 8px 0 10px; font-size: 14px; line-height: 1.5; overflow-wrap: anywhere; }
.lp-reply-actions { display: flex; gap: 8px; }
.lp-fake-btn { font-size: 13px; font-weight: 600; padding: 7px 12px; border-radius: 8px; background: #fff; color: var(--color-neutral-700); border: 1px solid var(--color-neutral-300); white-space: nowrap; }
.lp-fake-primary { background: var(--color-accent); color: #fff; border-color: transparent; }

.lp-section { max-width: 1120px; margin: 0 auto; padding: 72px 24px 0; }
.lp-section h2 { font: 700 clamp(26px, 3.4vw, 36px)/1.25 var(--font-heading); letter-spacing: -.015em; margin: 0 0 14px; overflow-wrap: anywhere; }
.lp-platforms { text-align: center; padding-top: 48px; }
.lp-plat-list { list-style: none; margin: 14px 0 0; padding: 0; display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; }
.lp-plat { display: inline-flex; align-items: center; gap: 8px; padding: 9px 16px; border: 1px solid var(--color-neutral-300); border-radius: 99px; background: #fff; font: 500 14px/1 var(--font-body); white-space: nowrap; }
.lp-plat[data-platform="youtube"] { --p: var(--platform-youtube); }
.lp-plat[data-platform="chzzk"] { --p: var(--platform-chzzk); }
.lp-plat .pf-icon { color: var(--color-neutral-500); }
.lp-plat:not(.is-soon) .pf-icon { color: var(--p); }
.lp-plat.is-soon { color: var(--color-neutral-600); background: var(--color-neutral-100); }
.lp-plat em { font-style: normal; font-size: 11px; color: var(--color-neutral-600); border: 1px solid var(--color-neutral-300); border-radius: 99px; padding: 2px 7px; }

.lp-feature { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 56px; align-items: center; }
.lp-feature.is-flip .lp-feature-text { order: 2; }
.lp-lead { font-size: 17px; line-height: 1.65; color: var(--color-text-muted); margin: 0 0 18px; }
.lp-points { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.lp-points li { position: relative; padding-left: 26px; font-size: 15px; line-height: 1.5; }
.lp-points li::before { content: ""; position: absolute; left: 0; top: 4px; width: 16px; height: 16px; border-radius: 99px; background: var(--color-accent-200); }
.lp-points li::after { content: ""; position: absolute; left: 5px; top: 8px; width: 4px; height: 7px; border: solid var(--color-accent-700); border-width: 0 2px 2px 0; transform: rotate(45deg); }

.lp-vis { padding: 24px; display: grid; gap: 14px; border-radius: 14px; background: linear-gradient(160deg, #fff, var(--color-accent-100)); }
.lp-grade-row { display: flex; align-items: center; gap: 14px; }
.lp-grade-row .lp-badge { width: 84px; text-align: center; }
.lp-grade-track { flex: 1; height: 12px; border-radius: 99px; background: var(--color-neutral-200); overflow: hidden; }
.lp-grade-track span { display: block; height: 100%; border-radius: 99px; }
.lp-chip-label { font: 600 12px/1 var(--font-body); color: var(--color-neutral-600); }
.lp-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.lp-chip { padding: 7px 14px; border-radius: 99px; background: #fff; border: 1px solid var(--color-accent-300); color: var(--color-accent-800); font-size: 14px; font-weight: 500; white-space: nowrap; }
.lp-flow { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.lp-flow li { display: flex; align-items: center; gap: 12px; padding: 12px 14px; border-radius: 10px; background: #fff; border: 1px solid var(--color-neutral-200); font-size: 15px; }
.lp-flow li.is-key { border-color: var(--color-accent); box-shadow: 0 0 0 3px var(--color-accent-200); font-weight: 600; }
.lp-flow-n { width: 24px; height: 24px; flex: none; border-radius: 99px; display: grid; place-items: center; background: var(--color-accent-100); color: var(--color-accent-700); font-size: 12px; font-weight: 700; }
.lp-flow li.is-key .lp-flow-n { background: var(--color-accent); color: #fff; }
.lp-flow-note { margin: 0; font-size: 13px; color: var(--color-neutral-600); }

.lp-how, .lp-trust { text-align: center; }
.lp-steps, .lp-trust-list { list-style: none; margin: 32px 0 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; text-align: left; }
.lp-steps li, .lp-trust-list li { padding: 24px; border-radius: 14px; }
.lp-steps h3, .lp-trust-list h3 { font: 600 18px/1.35 var(--font-heading); margin: 12px 0 8px; }
.lp-steps p, .lp-trust-list p { margin: 0; font-size: 15px; line-height: 1.6; color: var(--color-text-muted); }
.lp-trust-list h3 { margin-top: 0; }
.lp-step-n { width: 32px; height: 32px; border-radius: 99px; display: grid; place-items: center; background: var(--color-accent-gradient); color: #fff; font-weight: 700; }

.lp-final { margin: 80px auto 0; max-width: 1072px; padding: 56px 24px; border-radius: 20px; text-align: center; background: var(--color-accent-gradient); color: #fff; }
.lp-final h2 { font: 700 clamp(24px, 3.2vw, 34px)/1.3 var(--font-heading); margin: 0 0 24px; overflow-wrap: anywhere; }
.lp-final .lp-btn-primary { background: #fff; color: var(--color-accent-700); box-shadow: none; }
.lp-final .lp-btn-ghost { background: transparent; color: #fff; border-color: rgba(255, 255, 255, .6); }
.lp-final .lp-btn-ghost:not(:disabled):hover { background: rgba(255, 255, 255, .14); }
.lp-final .lp-btn:focus-visible { outline-color: #fff; }

@media (max-width: 900px) {
  .lp-feature { grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .lp-feature.is-flip .lp-feature-text { order: 0; }
  .lp-steps, .lp-trust-list { grid-template-columns: minmax(0, 1fr); }
  .lp-hero { padding: 56px 20px 60px; }
  .lp-final { margin-inline: 20px; }
}
@media (max-width: 560px) {
  .lp-nav-inner { padding-inline: 16px; gap: 8px; }
  .lp-nav-links { display: none; }
  .lp-nav-cta { margin-left: auto; }
  .lp-section { padding-inline: 16px; padding-top: 56px; }
  .lp-hero { padding-inline: 16px; }
  .lp-cta .lp-btn { flex: 1 1 100%; }
  .lp-mock-body { padding: 14px; }
  .lp-comments li { flex-wrap: wrap; }
  .lp-comment-text { flex-basis: calc(100% - 40px); }
  .lp-badge { margin-left: 38px; }
  body[data-landing] .site-footer { padding-inline: 16px; }
}
@media (prefers-reduced-motion: no-preference) { .lp-btn { transition: filter .15s, background .15s; } }