/* 预览页壳 + 手机框 + 所有变体共用的第 2 屏「时间地点」。
   不含任何具体风格的封面样式（见同目录 a-* ~ e-*.css）。 */
:root { --grain: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 .5 0 0 0 0 .5 0 0 0 0 .5 0 0 0 .9 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>"); }
* { box-sizing: border-box; margin: 0; padding: 0; }
body { background: #1a1a1c; color: #e8e6e1; font: 14px/1.6 system-ui, "Noto Sans CJK SC", sans-serif; }
.topbar { position: sticky; top: 0; z-index: 9; display: flex; gap: 22px; justify-content: center; padding: 14px; background: rgba(20,20,22,.88); backdrop-filter: blur(10px); }
.topbar a { color: #bbb; text-decoration: none; font-size: 13px; letter-spacing: .08em; }
.topbar a:hover { color: #fff; }
.intro { text-align: center; padding: 48px 20px 8px; color: #9a9890; }
.intro h1 { color: #fff; font-weight: 500; font-size: 22px; margin-bottom: 6px; }
.group { padding: 56px 24px 24px; }
.group > h2 { text-align: center; font-weight: 500; font-size: 20px; color: #fff; }
.group > p { text-align: center; color: #8d8b84; margin: 4px 0 30px; }
.row { display: flex; gap: 40px; justify-content: center; flex-wrap: wrap; }
figure { text-align: center; }
figcaption { margin-top: 12px; color: #aaa; font-size: 13px; }
figcaption b { color: #fff; font-weight: 500; }

.phone { width: 300px; height: 620px; border: 8px solid #000; border-radius: 40px; overflow: hidden; position: relative; box-shadow: 0 30px 60px rgba(0,0,0,.5); text-align: left; }
.screens { height: 100%; overflow-y: auto; scroll-snap-type: y mandatory; scrollbar-width: none; }
.screens::-webkit-scrollbar { display: none; }
.screen { height: 100%; scroll-snap-align: start; position: relative; overflow: hidden; background: var(--bg); color: var(--fg); }
.hint { position: absolute; bottom: 12px; left: 0; right: 0; text-align: center; font-size: 10px; letter-spacing: .3em; opacity: .6; animation: bob 2s ease-in-out infinite; z-index: 5; }
@keyframes bob { 50% { transform: translateY(-5px); } }

/* 进场动效：屏幕进入视口时 .in 生效，--i 控制先后 */
.rise { opacity: 0; transform: translateY(16px); transition: opacity .9s ease-out, transform .9s ease-out; transition-delay: calc(var(--i, 0) * .16s); }
.screen.in .rise { opacity: 1; transform: none; }
.grain::after { content: ""; position: absolute; inset: 0; background: var(--grain); opacity: .16; mix-blend-mode: multiply; pointer-events: none; z-index: 4; }

/* 第 2 屏：时间地点（各变体用 CSS 变量换肤） */
.info { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px; text-align: center; padding: 30px; font-family: var(--body); }
.info small { letter-spacing: .4em; font-size: 11px; opacity: .7; }
.info .date { font: var(--head-weight, 400) 44px/1.1 var(--head); color: var(--accent); }
.info .line { width: 40px; height: 1px; background: var(--accent); opacity: .6; margin: 6px 0; }
.info .venue { font-size: 17px; font-family: var(--head); }
.info .addr { font-size: 12px; opacity: .7; line-height: 1.8; }
.info .btn { margin-top: 14px; padding: 9px 26px; border: 1px solid var(--accent); color: var(--accent); border-radius: var(--btn-radius, 0); font-size: 12px; letter-spacing: .25em; }
.info .btn.fill { background: var(--accent); color: var(--bg); }