/* ============================================================
   충북 스마트농업 심포지엄 — 공유 디자인 시스템 (Neutral Minimal)
   전 페이지 공통: 토큰 · 베이스 · 네비 · 버튼 · 푸터
   원칙: 크롬(UI)은 무채색, 색은 콘텐츠(포스터·영상)가 낸다.
   ============================================================ */

:root {
  /* 무채색 팔레트 */
  --canvas:#ffffff;
  --paper:#f5f5f4;
  --paper-2:#ececeb;
  --ink:#18181b;
  --ink-body:#52525b;
  --ink-muted:#8e8e96;
  --line:#e6e6e4;
  --line-strong:#d6d6d3;

  --accent:#18181b;      /* 인터랙션 = 잉크 (무채색 미니멀) */
  --dark:#1a1a1d;        /* 단일 다크 (푸터) */
  --dark-2:#232327;
  --on-dark:#ffffff;
  --on-dark-muted:#a1a1aa;

  --shadow-photo: 0 8px 36px -12px rgba(0,0,0,.22), 0 2px 8px rgba(0,0,0,.05);
  --shadow-media: var(--shadow-photo);

  --r-sm:10px; --r-md:16px; --r-lg:22px; --r-btn:12px; --r-pill:999px;

  --ease: cubic-bezier(.4,0,.2,1);
  --t: .25s var(--ease);

  /* spacing (8px) */
  --sp-1:4px;--sp-2:8px;--sp-3:12px;--sp-4:16px;--sp-5:24px;
  --sp-6:32px;--sp-7:48px;--sp-8:64px;--sp-9:80px;--sp-10:104px;

  /* type scale */
  --fs-display: clamp(34px,5vw,64px);
  --fs-h2:      clamp(26px,3.2vw,40px);
  --fs-h3:      clamp(19px,2vw,23px);
  --fs-lead:    clamp(17px,1.8vw,20px);
  --fs-body:17px; --fs-sub:15px; --fs-cap:13.5px; --fs-label:12px;

  /* containers */
  --w:1080px; --w-text:860px; --w-wide:1240px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: 'Inter','Noto Sans KR',-apple-system,BlinkMacSystemFont,system-ui,'Apple SD Gothic Neo',sans-serif;
  font-size: var(--fs-body); line-height: 1.72; color: var(--ink-body);
  background: var(--canvas); -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
}
img { display: block; max-width: 100%; }
a { color: var(--ink); text-decoration: none; }
::selection { background: var(--ink); color: #fff; }
:where(a,button,[tabindex],[role="button"]):focus-visible {
  outline: 2px solid var(--ink); outline-offset: 3px; border-radius: 6px;
}

/* ── 컨테이너 ───────────────────────────── */
.container { max-width: var(--w); margin: 0 auto; padding: 0 24px; }
.container.text { max-width: var(--w-text); }
.container.wide { max-width: var(--w-wide); }

/* ── 공통 라벨/헤드 ─────────────────────── */
.kicker {
  display: inline-block; font-size: var(--fs-label); font-weight: 600;
  letter-spacing: .16em; text-transform: uppercase; color: var(--ink-muted);
}
.sec-head { margin-bottom: var(--sp-7); }
.sec-head.center { text-align: center; }
.sec-title { font-size: var(--fs-h2); font-weight: 700; letter-spacing: -.025em; line-height: 1.15; color: var(--ink); }
.sec-head .kicker { margin-bottom: 12px; }
.sec-desc { margin-top: 14px; font-size: var(--fs-lead); font-weight: 400; color: var(--ink-muted); letter-spacing: -.01em; }
.sec-head.center .sec-desc { margin-left: auto; margin-right: auto; max-width: 560px; }

/* ── NAV (공통) ─────────────────────────── */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.78);
  backdrop-filter: saturate(180%) blur(20px); -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: var(--w-wide); margin: 0 auto; padding: 0 24px;
  height: 56px; display: flex; align-items: center; gap: 20px;
}
.nav-brand { display: flex; align-items: baseline; gap: 8px; color: var(--ink); flex-shrink: 0; }
.nav-brand b { font-size: 15px; font-weight: 700; letter-spacing: -.01em; }
.nav-brand .yr {
  font-size: 11px; font-weight: 600; color: var(--ink-muted);
  border: 1px solid var(--line-strong); border-radius: var(--r-pill); padding: 1px 7px;
}
.nav-links { margin-left: auto; display: flex; gap: 2px; }
.nav-links a {
  font-size: 13px; color: var(--ink-body); padding: 7px 13px; border-radius: var(--r-pill);
  transition: background var(--t), color var(--t);
}
.nav-links a:hover { background: var(--paper-2); color: var(--ink); }
.nav-links a:active { transform: scale(.96); }
.nav-burger { display: none; margin-left: auto; background: none; border: none; cursor: pointer; padding: 10px; color: var(--ink); }
.nav-burger svg { display: block; width: 22px; height: 22px; }
.nav-mobile { display: none; flex-direction: column; background: rgba(255,255,255,.97); border-top: 1px solid var(--line); }
.nav-mobile.open { display: flex; }
.nav-mobile a { font-size: 15px; color: var(--ink-body); padding: 14px 24px; }
.nav-mobile a:hover { color: var(--ink); }
@media (max-width: 760px) {
  .nav-links { display: none; }
  .nav-burger { display: block; }
}

/* ── 버튼 (공통) ────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 7px; font-family: inherit;
  font-size: 14px; font-weight: 600; padding: 11px 20px; border-radius: var(--r-pill);
  border: 1px solid transparent; cursor: pointer; letter-spacing: -.01em;
  transition: background var(--t), border-color var(--t), color var(--t);
}
.btn svg { width: 15px; height: 15px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.btn-fill { background: var(--ink); color: #fff; border-color: var(--ink); }
.btn-fill:hover { background: #000; }
.btn-fill:active { transform: scale(.97); }
.btn-line { background: transparent; color: var(--ink); border-color: var(--line-strong); }
.btn-line:hover { border-color: var(--ink); background: var(--paper); }
.btn-line:active { transform: scale(.97); }
.btn-text {
  display: inline-flex; align-items: center; gap: 6px; padding: 10px 0 4px;
  font-size: 15px; font-weight: 600; color: var(--ink); letter-spacing: -.01em;
  transition: gap var(--t), opacity var(--t);
}
.btn-text svg { width: 15px; height: 15px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.btn-text:hover { gap: 10px; }
.btn-text:active { opacity: .6; }
.btn-text.disabled { color: var(--ink-muted); cursor: default; }
.btn-text.disabled:hover { gap: 6px; }

/* 상태 칩 */
.chip {
  font-size: 11px; font-weight: 600; letter-spacing: .04em; text-transform: uppercase;
  padding: 5px 10px; border-radius: var(--r-pill); color: var(--ink-body);
  background: var(--paper-2); border: 1px solid var(--line);
}

/* ── FOOTER (공통) ──────────────────────── */
.site-foot { background: var(--dark); color: var(--on-dark); padding: 48px 0 32px; }
.site-foot .in {
  max-width: var(--w); margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px;
  padding-bottom: 26px; border-bottom: 1px solid rgba(255,255,255,.1); margin-bottom: 22px;
}
.site-foot .org { font-size: 15px; font-weight: 600; color: var(--on-dark); }
.site-foot .org .sub { display: block; font-size: 13px; font-weight: 400; color: var(--on-dark-muted); margin-top: 5px; }
.site-foot nav { display: flex; gap: 18px; }
.site-foot nav a { font-size: 14px; color: var(--on-dark-muted); transition: color var(--t); }
.site-foot nav a:hover { color: var(--on-dark); }
.site-foot .copy { max-width: var(--w); margin: 0 auto; padding: 0 24px; text-align: center; font-size: 12px; color: var(--on-dark-muted); }

/* ── REDUCED MOTION ─────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}