/* FICS-AS 宣传网页 · 界面镜像骨架（阶段 1）
 * 结构：顶部菜单行+主导航 tab / 左图层树目录 / 中央画布内容区 /
 *       右下 AI 面板 / 底部状态栏跑马灯 —— 全部映射软件真实部件。 */

/* ── 顶部：菜单行（装饰，复刻软件真实菜单） ── */
#menubar {
  display: flex; gap: 2px; align-items: center;
  padding: 4px 10px 0; background: var(--c-bg);
  border-bottom: 1px solid #e3e5df;
  font-size: 12.5px; color: var(--c-gray); overflow-x: auto; white-space: nowrap;
}
#menubar span { padding: 3px 9px; border-radius: 4px 4px 0 0; flex: none; }

/* ── 顶部：主导航（= 软件功能区 tab） ── */
#topbar {
  position: sticky; top: 0; z-index: 100;
  display: flex; gap: 4px; align-items: flex-end;
  padding: 6px 10px 0; background: var(--c-bg);
  border-bottom: 2px solid var(--c-blue);
  overflow-x: auto; overflow-y: hidden;   /* 手机上导航横滑，不撑破版面 */
}
#topbar .logo {
  font-weight: 800; font-size: 17px; color: var(--c-blue);
  margin: 0 14px 5px 4px; letter-spacing: .5px; flex: none;
}
#topbar a.tab {
  padding: 7px 16px 6px; font-size: 14px; color: var(--c-gray);
  text-decoration: none; border: 1px solid transparent; border-bottom: none;
  border-radius: 7px 7px 0 0; flex: none;
}
#topbar a.tab:hover { color: var(--c-blue); background: var(--c-blue-bg); }
#topbar a.tab.act {
  background: var(--c-card); color: var(--c-blue); font-weight: 700;
  border-color: #d8e2f0; box-shadow: 0 -2px 4px rgba(42,120,214,.08);
}

/* ── 三栏主体 ── */
#main { display: flex; align-items: flex-start; min-height: 60vh; }

/* 左：图层树目录（= 软件工作台树） */
#toc {
  width: var(--toc-w); flex: none; position: sticky; top: 52px;
  padding: 12px 10px 16px; font-size: 13.5px;
}
#toc .panel-title {
  font-size: 13px; color: var(--c-gray);
  border-bottom: 1px solid #e3e5df; padding-bottom: 6px; margin-bottom: 8px;
}
#toc label.item {
  display: flex; align-items: center; gap: 7px;
  padding: 5px 6px; border-radius: 6px; cursor: pointer; color: var(--c-ink);
}
#toc label.item:hover { background: var(--c-blue-bg); }
#toc label.item input { accent-color: var(--c-blue); margin: 0; }
#toc .sub { margin-left: 20px; font-size: 12.5px; color: var(--c-gray); }

/* 中：画布内容区 */
#stage {
  flex: 1; min-width: 0; margin: 14px 8px;
  background: var(--c-card); border: 1px solid #e3e5df;
  border-radius: var(--radius-panel); padding: 18px;
}
.canvas-hint {
  border: 1.5px dashed #c9d6ea; border-radius: 8px;
  color: var(--c-gray-light); text-align: center; padding: 34px 10px;
  font-size: 13px; margin: 14px 0;
}

/* ── 淹没 scrubber ── */
.scrub-wrap { max-width: 960px; margin: 0 auto; }
.scrub-wrap video {
  display: block; width: 100%; border-radius: 8px;
  border: 1px solid #dfe5ee; background: #0c1c30;
}
.scrub-bar {
  display: flex; gap: 10px; align-items: center; margin-top: 10px;
}
.scrub-bar input[type=range] {
  flex: 1; accent-color: var(--c-blue); height: 4px;
}
.scrub-bar button {
  border: 1px solid #d8e2f0; background: var(--c-card); color: var(--c-blue);
  border-radius: 6px; padding: 4px 12px; font-size: 13px; cursor: pointer;
}
.scrub-bar button:hover { background: var(--c-blue-bg); }
.scrub-time { font: 12px var(--font-mono); color: var(--c-gray); min-width: 86px; }
.replay-tag {
  display: inline-block; margin-top: 10px;
  font-size: 12px; color: var(--c-red);
  border: 1px solid var(--c-red); border-radius: 4px;
  padding: 1px 8px; background: #fdf3f3;
}
.scrub-title { font-size: 16px; font-weight: 700; color: var(--c-ink); margin: 4px 0 12px; }
.scrub-title .badge { margin-right: 8px; vertical-align: 3px; }

/* 右下：AI 面板 */
#aipanel {
  width: var(--aipanel-w); flex: none; position: sticky; top: 52px;
  margin: 14px 10px 14px 0;
  background: var(--c-card); border: 1px solid #e3e5df;
  border-radius: var(--radius-panel);
  display: flex; flex-direction: column; height: 420px;
  box-shadow: var(--shadow-card);
}
#aipanel .head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 9px 12px; border-bottom: 1px solid #eef0ea;
  font-size: 13.5px; font-weight: 700; color: var(--c-ink);
}
#aipanel .head .ops { font-weight: 400; font-size: 12px; color: var(--c-gray); display: flex; gap: 10px; }
#aipanel .msgs { flex: 1; overflow: hidden; padding: 10px 12px; font-size: 13px; }
#aipanel .msg {
  background: var(--c-blue-bg); border-radius: 8px;
  padding: 8px 10px; line-height: 1.65; color: var(--c-ink);
}
#aipanel .msg .who { color: var(--c-blue); font-size: 12px; font-weight: 700; display: block; margin-bottom: 2px; }
#aipanel .caret { display: inline-block; width: 7px; background: var(--c-blue); animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
#aipanel .input {
  display: flex; gap: 8px; padding: 10px; border-top: 1px solid #eef0ea;
}
#aipanel .input .ph {
  flex: 1; border: 1px solid #e0e4da; border-radius: 6px;
  padding: 7px 10px; font-size: 12.5px; color: var(--c-gray-light);
  white-space: nowrap; overflow: hidden;
}
#aipanel .input .send {
  background: var(--c-blue); color: #fff; border-radius: 6px;
  font-size: 13px; padding: 7px 16px; flex: none;
}

/* ── 底部：状态栏跑马灯 ── */
#statusbar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 100;
  height: var(--statusbar-h); background: #f3eee3;
  border-top: 1px solid #e0e2da;
  display: flex; align-items: center; font-size: 12px; color: var(--c-gray);
  overflow: hidden;
}
#statusbar .cell {
  padding: 0 12px; border-right: 1px solid #e0e2da; white-space: nowrap; flex: none;
}
#statusbar .marquee { flex: 1; overflow: hidden; }
#statusbar .marquee > div {
  display: inline-block; white-space: nowrap;
  padding-left: 100%; animation: slide 36s linear infinite;
}
#statusbar .marquee b { color: var(--c-blue); font-weight: 700; }
@keyframes slide { to { transform: translateX(-100%); } }

/* 状态栏只在演示弹窗内出现，滚动容器给它让位（主页无状态栏） */
#demo-scroll { padding-bottom: var(--statusbar-h); }

/* ── Hero（阶段2）：真界面 Ken Burns + 标语 + 徽章家族 ── */
.hero {
  position: relative; border-radius: var(--radius-panel); overflow: hidden;
  border: 1px solid #dfe5ee; min-height: 560px;
  display: flex; align-items: flex-end; margin-bottom: 18px;
}
.hero-bg {
  position: absolute; inset: 0;
  background-size: cover; background-position: center top;
  animation: kenburns 26s ease-in-out infinite alternate;
}
.hero--a .hero-bg { background-image: url(../img/hero_a.webp); background-position: center 32%; }
.hero--b .hero-bg { background-image: url(../img/hero_b.webp); background-position: center 20%; }
@keyframes kenburns {
  from { transform: scale(1) translateX(0); }
  to   { transform: scale(1.06) translateX(-1.5%); }
}
@media (prefers-reduced-motion: reduce) { .hero-bg { animation: none; } }
.hero-panel {
  position: relative; margin: 0 16px 26px 16px; max-width: 560px;
  background: rgba(255, 255, 255, .92); backdrop-filter: blur(4px);
  border-radius: var(--radius-card); box-shadow: var(--shadow-card);
  padding: 22px 26px;
}
.hero-panel h1 { margin: 0; font-size: 30px; line-height: 1.25; color: var(--c-ink); }
.hero-panel h1 .en { color: var(--c-blue); font-weight: 800; letter-spacing: .5px; }
.hero-panel h1 small {
  display: block; font-size: 17px; font-weight: 600; color: var(--c-gray); margin-top: 4px;
}
.hero-line { margin: 12px 0 14px; font-size: 14.5px; color: var(--c-ink); }
.hero-badges { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-badges .b {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  font-size: 11px; color: var(--c-gray);
}
.hero-cta { margin-top: 16px; display: flex; gap: 10px; flex-wrap: wrap; }
.hero-cta a {
  text-decoration: none; font-size: 14px; padding: 8px 18px; border-radius: 7px;
}
.hero-cta a.pri { background: var(--c-blue); color: #fff; font-weight: 700; }
.hero-cta a.pri:hover { background: var(--c-blue-deep); }
.hero-cta a.sec { border: 1px solid #d8e2f0; color: var(--c-blue); background: #fff; }
.hero-cta a.sec:hover { background: var(--c-blue-bg); }

/* ── 内容节（阶段2）：功能定位 / 核心技术卡 ── */
.sec-h {
  display: flex; align-items: center; gap: 10px;
  margin: 26px 0 12px; font-size: 20px; font-weight: 800; color: var(--c-ink);
}
.sec-h .kicker {
  font-size: 12px; font-weight: 700; color: var(--c-blue);
  background: var(--c-blue-bg); border-radius: 4px; padding: 2px 8px; flex: none;
}
.pos-block {
  background: var(--c-blue-bg); border-radius: var(--radius-panel);
  padding: 16px 20px; font-size: 14.5px; line-height: 1.9; color: var(--c-ink);
  margin-bottom: 18px;
}
.pos-block b { color: var(--c-blue); }
.tech-card {
  background: var(--c-card); border: 1px solid #e3e5df;
  border-radius: var(--radius-card); box-shadow: var(--shadow-card);
  padding: 20px 22px; margin-bottom: 18px;
}
.tech-card .t-head { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.tech-card .t-head h3 { margin: 0; font-size: 17px; color: var(--c-ink); }
.tech-card .t-body {
  font-size: 13.5px; line-height: 1.85; color: var(--c-ink);
  white-space: pre-line;
}
.tech-fig { margin: 14px 0 4px; text-align: center; }
.tech-fig img { max-width: 100%; border: 1px solid #edf0f5; border-radius: 8px; }
.tech-fig figcaption { font-size: 12px; color: var(--c-gray-light); margin-top: 6px; }
.tech-fig.duo { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 900px) { .tech-fig.duo { grid-template-columns: 1fr; } }
.stat-chips { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 12px; }
.stat-chips .chip {
  flex: 1; min-width: 130px; text-align: center;
  background: var(--c-blue-bg); border-radius: 8px; padding: 10px 8px;
}
.stat-chips .chip b { display: block; font-size: 20px; color: var(--c-blue); }
.stat-chips .chip span { font-size: 12px; color: var(--c-gray); }
.ui-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 12px 0 16px; }
@media (max-width: 900px) { .ui-cards { grid-template-columns: 1fr; } }
.ui-cards .ucard {
  background: var(--c-card); border: 1px solid #e3e5df; border-radius: var(--radius-panel);
  padding: 14px 16px; font-size: 13px; line-height: 1.75; color: var(--c-ink);
  box-shadow: var(--shadow-card);
}
.ui-cards .ucard b { display: block; color: var(--c-blue); margin-bottom: 4px; font-size: 14px; }

/* ── 滚动渐显（JS 加 .in 触发；prefers-reduced-motion 直出） ── */
.rise { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.rise.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .rise { opacity: 1; transform: none; transition: none; } }

/* ── 响应式降级 ── */
@media (max-width: 1280px) {
  #aipanel { display: none; }
}
@media (max-width: 900px) {
  #toc { display: none; }
  #stage { margin: 10px; padding: 12px; }
  #menubar { display: none; }
}