/* ===== light theme (default) ===== */
:root {
  --bg: #f4f6fb;
  --bg2: #eaeef6;
  --card: #ffffff;
  --line: #dde3ee;
  --txt: #131a2b;
  --mut: #61708c;
  --acc: #2b7fff;
  --acc2: #6b4cff;
  --ok: #16a34a;
  --warn: #d97706;
  --danger: #e5484d;
  --radius: 18px;
  --shadow: 0 12px 40px rgba(30, 50, 90, .14);
  --body-bg: radial-gradient(1200px 700px at 80% -10%, #e6ecff 0%, #f4f6fb 55%);
  --welcome-bg: linear-gradient(150deg, #eaf0ff 0%, #ffffff 70%);
  --welcome-title: linear-gradient(90deg, #1b2540, var(--acc));
  --bar-bg: rgba(244, 246, 251, .8);
}

/* ===== dark theme ===== */
[data-theme="dark"] {
  --bg: #0a0e1a;
  --bg2: #111726;
  --card: #161d30;
  --line: #243049;
  --txt: #e8edf7;
  --mut: #8a96b0;
  --acc: #4da3ff;
  --acc2: #7c5cff;
  --ok: #36d399;
  --warn: #fbbf24;
  --danger: #f87272;
  --shadow: 0 12px 40px rgba(0, 0, 0, .45);
  --body-bg: radial-gradient(1200px 700px at 80% -10%, #1b2440 0%, #0a0e1a 55%);
  --welcome-bg: linear-gradient(150deg, #20294a 0%, #141a2d 70%);
  --welcome-title: linear-gradient(90deg, #fff, var(--acc));
  --bar-bg: rgba(10, 14, 26, .7);
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; height: 100%; }
body {
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--body-bg) fixed;
  color: var(--txt);
  -webkit-font-smoothing: antialiased;
  overscroll-behavior: none;
}
button { font: inherit; cursor: pointer; border: 0; }
a { color: var(--acc); }

/* ---------- viewer ---------- */
.viewer { height: 100dvh; display: flex; flex-direction: column; }
.topbar {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 16px; border-bottom: 1px solid var(--line);
  background: var(--bar-bg); backdrop-filter: blur(8px);
}
.brand { font-weight: 700; letter-spacing: .3px; font-size: 15px; }
.brand span { color: var(--acc); }
.topbar .grow { flex: 1; }
.pill {
  font-size: 12px; padding: 5px 11px; border-radius: 999px;
  border: 1px solid var(--line); color: var(--mut); background: var(--bg2);
}
.pill.live { color: #fff; border-color: transparent; background: linear-gradient(90deg, var(--acc2), var(--acc)); }
.pill.live::before { content: "● "; color: #fff; }

.deck { flex: 1; position: relative; overflow: hidden; }
.track {
  display: flex; height: 100%;
  transition: transform .4s cubic-bezier(.22, .61, .36, 1);
  will-change: transform;
}
.slide {
  min-width: 100%; height: 100%; padding: 18px;
  display: flex; align-items: center; justify-content: center;
}
.card {
  width: min(860px, 100%); max-height: 100%;
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow);
  display: flex; flex-direction: column; overflow: hidden;
}
.imgwrap { position: relative; background: #0b0f1c; }
.imgwrap img {
  display: block; width: 100%; max-height: 52dvh; object-fit: contain; cursor: copy;
}
.imgwrap .hint {
  position: absolute; right: 10px; bottom: 10px;
  font-size: 11px; color: var(--txt); background: rgba(0, 0, 0, .55);
  padding: 4px 9px; border-radius: 999px; pointer-events: none;
}
.body { padding: 18px 20px 20px; overflow: auto; }
.title { margin: 0 0 8px; font-size: clamp(18px, 4.6vw, 26px); cursor: copy; }
.desc { margin: 0; color: var(--mut); line-height: 1.55; white-space: pre-wrap; cursor: copy; font-size: clamp(14px, 3.5vw, 16px); }
.hidden-answer {
  filter: blur(7px); user-select: none; opacity: .6;
}
.prompt { margin-top: 16px; border: 1px solid var(--line); border-radius: 12px; background: var(--bg2); padding: 12px 14px; }
.prompt-label { font-size: 11px; letter-spacing: 1.5px; text-transform: uppercase; color: var(--acc); font-weight: 700; margin-bottom: 8px; }
.prompt-text { margin: 0 0 10px; white-space: pre-wrap; word-break: break-word; font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: 13px; line-height: 1.5; color: var(--txt); }
.nocopy { margin-top: 16px; font-size: 13px; color: var(--mut); }
.copybar { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 16px; }
.btn {
  padding: 9px 14px; border-radius: 11px; font-size: 13px; font-weight: 600;
  background: var(--bg2); color: var(--txt); border: 1px solid var(--line);
}
.btn:active { transform: scale(.97); }
.btn.acc { background: linear-gradient(90deg, var(--acc2), var(--acc)); border-color: transparent; color: #fff; }

.nav {
  display: flex; align-items: center; gap: 14px; justify-content: center;
  padding: 12px 16px calc(12px + env(safe-area-inset-bottom)); border-top: 1px solid var(--line);
}
.nav button {
  width: 46px; height: 46px; border-radius: 50%; font-size: 20px;
  background: var(--bg2); color: var(--txt); border: 1px solid var(--line);
}
.nav button:disabled { opacity: .35; }
.counter { font-variant-numeric: tabular-nums; color: var(--mut); min-width: 64px; text-align: center; }
.dots { display: flex; gap: 6px; }
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--line); }
.dot.on { background: var(--acc); }

/* welcome slide */
.card.welcome {
  background: var(--welcome-bg);
  align-items: center; justify-content: center; text-align: center;
}
.welcome-body { padding: 48px 28px; max-width: 560px; }
.welcome-mark { font-size: 14px; letter-spacing: 3px; text-transform: uppercase; color: var(--mut); margin-bottom: 22px; }
.welcome-mark span { color: var(--acc); }
.welcome-title { margin: 0 0 14px; font-size: clamp(26px, 7vw, 42px); line-height: 1.1; background: var(--welcome-title); -webkit-background-clip: text; background-clip: text; color: transparent; }
.welcome-sub { margin: 0; color: var(--mut); font-size: clamp(15px, 4vw, 18px); }

.empty { margin: auto; text-align: center; color: var(--mut); padding: 40px; }

/* toast */
.toast {
  position: fixed; left: 50%; bottom: 90px; transform: translateX(-50%) translateY(20px);
  background: var(--ok); color: #04210f; font-weight: 700; font-size: 14px;
  padding: 10px 18px; border-radius: 999px; opacity: 0; pointer-events: none;
  transition: .25s; z-index: 50;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.err { background: var(--danger); color: #2a0606; }

/* ---------- admin ---------- */
.wrap { max-width: 920px; margin: 0 auto; padding: 24px 16px 80px; }
h1 { font-size: 22px; }
.panel { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; margin-bottom: 18px; }
label { display: block; font-size: 13px; color: var(--mut); margin: 12px 0 6px; }
input, textarea {
  width: 100%; padding: 11px 13px; border-radius: 11px; font: inherit;
  background: var(--bg2); border: 1px solid var(--line); color: var(--txt);
}
textarea { min-height: 90px; resize: vertical; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.adminslide { display: flex; gap: 12px; align-items: center; padding: 10px; border: 1px solid var(--line); border-radius: 12px; margin-bottom: 10px; background: var(--bg2); }
.adminslide img { width: 70px; height: 52px; object-fit: cover; border-radius: 8px; background: #000; }
.adminslide .meta { flex: 1; min-width: 0; }
.adminslide .meta b { display: block; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.adminslide .meta small { color: var(--mut); }
.sessctl { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.switch { display: inline-flex; gap: 8px; align-items: center; font-size: 14px; }
.muted { color: var(--mut); font-size: 13px; }
.danger { color: var(--danger); }
.hide { display: none !important; }

/* edit modal */
.modal { position: fixed; inset: 0; background: rgba(0, 0, 0, .55); display: flex; align-items: flex-start; justify-content: center; padding: 20px; overflow: auto; z-index: 60; }
.modal-card { width: min(620px, 100%); background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); }
.thumb { width: 120px; height: 80px; object-fit: cover; border-radius: 10px; background: #000; border: 1px solid var(--line); }
.adminslide .badge { font-size: 11px; padding: 2px 7px; border-radius: 999px; background: var(--bg); border: 1px solid var(--line); color: var(--mut); margin-right: 6px; }