/* 🫖 茶产业大脑 BI 大屏 · 全局样式（白底浅绿日间模式 ⇄ 暗黑模式 & 信息高密度组件） */

/* 默认：日间模式（简洁白色主体 + 浅绿） */
:root, body.light-theme {
  --theme-color: #6f8a76;
  --theme-color-2: #9db3a4;
  --theme-glow: rgba(111,138,118,0.12);
  --bg-color: #f1f3f0;
  --card-bg: #ffffff;
  --card-sub-bg: #ecefeb;
  --card-border: #d9ded8;
  --text-main: #303631;
  --text-sub: #6c756d;
  --header-bg: #566b5c;
  --header-text: #f3f6f3;
  --accent-gold: #a78a4e;
  --accent-cyan: #5f8a80;
  --table-header-bg: rgba(111,138,118,0.07);
  --table-hover-bg: rgba(111,138,118,0.05);
  --shadow-card: 0 4px 16px rgba(80,100,85,0.10);
  --vp-scrim: rgba(244,248,245,0.62);
}

/* 暗黑模式 Dark Theme */
body.dark-theme {
  --theme-color: #88a393;
  --theme-color-2: #a9c2b6;
  --theme-glow: rgba(136,163,147,0.30);
  --bg-color: #151917;
  --card-bg: rgba(26,32,28,0.9);
  --card-sub-bg: rgba(32,40,35,0.7);
  --card-border: rgba(136,163,147,0.28);
  --text-main: #dfe7e0;
  --text-sub: #93a89c;
  --header-bg: rgba(18,24,20,0.96);
  --header-text: #f3f6f3;
  --accent-gold: #c8b079;
  --accent-cyan: #6fb3a6;
  --table-header-bg: rgba(255,255,255,0.05);
  --table-hover-bg: rgba(136,163,147,0.12);
  --vp-scrim: rgba(8,16,12,0.60);
  --shadow-card: 0 4px 22px rgba(0,0,0,0.5);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 14px; line-height: 1.55;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* ===== Header & Navbar ===== */
.header-bar {
  background: var(--header-bg);
  border-bottom: 1px solid var(--card-border);
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
  position: sticky; top: 0; z-index: 100;
}
.header-top { display: flex; justify-content: space-between; align-items: center; padding: 12px 24px 8px 24px; }
.brand-box { display: flex; align-items: center; gap: 14px; }
.brand-logo {
  background: #ffffff; color: var(--theme-color); font-weight: 800; font-size: 13px;
  padding: 4px 12px; border-radius: 6px; box-shadow: 0 2px 8px rgba(0,0,0,0.15); letter-spacing: 1px;
}
.header-title { font-size: 22px; font-weight: 700; letter-spacing: 1.5px; color: var(--header-text); }
.header-sub { font-size: 11.5px; color: rgba(255,255,255,0.72); letter-spacing: 0.5px; margin-top: 2px; }
.header-status { display: flex; align-items: center; gap: 14px; }
.status-badge {
  font-size: 11.5px; padding: 4px 10px; border-radius: 12px;
  background: rgba(255,255,255,0.15); color: #fff; border: 1px solid rgba(255,255,255,0.3);
}
.status-badge.live { animation: pulseBadge 2s infinite alternate; }
@keyframes pulseBadge { 0% { box-shadow: 0 0 6px rgba(255,255,255,0.3); } 100% { box-shadow: 0 0 16px rgba(255,255,255,0.7); } }
.btn-action {
  background: rgba(255,255,255,0.15); border: 1px solid rgba(255,255,255,0.3); color: #fff;
  padding: 6px 14px; font-size: 12.5px; border-radius: 6px; cursor: pointer; transition: all 0.2s ease; font-weight: 600;
}
.btn-action:hover { background: rgba(255,255,255,0.25); border-color: #fff; }
.btn-action.highlight { background: #fff; color: var(--theme-color); border-color: #fff; font-weight: 700; box-shadow: 0 2px 10px rgba(0,0,0,0.15); }
.live-time { font-family: monospace; font-size: 13px; color: #fff; }

/* ===== 科幻整行导航栏 (HUD 控制台风) ===== */
.center-nav-bar {
  display: flex; gap: 8px; padding: 0 22px 10px 22px; align-items: stretch;
}
.nav-item {
  flex: 1 1 0; min-width: 0; position: relative; overflow: hidden;
  display: flex; align-items: center; gap: 8px; justify-content: flex-start;
  padding: 9px 12px; cursor: pointer; border-radius: 8px;
  background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.16);
  color: rgba(255,255,255,0.82); font-weight: 600; font-size: 13.5px; white-space: nowrap;
  transition: all 0.28s ease;
}
.nav-item::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
  background: linear-gradient(to bottom, var(--accent-cyan), var(--theme-color-2));
  transform: scaleY(0); transform-origin: top; transition: transform 0.28s ease;
}
.nav-item::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(120deg, transparent 30%, rgba(255,255,255,0.22) 50%, transparent 70%);
  transform: translateX(-120%); transition: transform 0.6s ease;
}
.nav-item:hover { color: #fff; background: rgba(255,255,255,0.14); border-color: rgba(255,255,255,0.4); }
.nav-item:hover::after { transform: translateX(120%); }
.nav-item.active {
  color: #fff; background: linear-gradient(120deg, rgba(150,180,165,0.18), rgba(95,138,128,0.30));
  border-color: var(--accent-cyan); box-shadow: 0 0 0 1px rgba(150,180,165,0.35), 0 6px 18px rgba(0,0,0,0.35);
}
.nav-item.active::before { transform: scaleY(1); box-shadow: 0 0 10px var(--accent-cyan); }
.nav-no { font-family: "SF Mono", ui-monospace, monospace; font-size: 10px; opacity: 0.6; letter-spacing: 0.5px; }
.nav-ico { font-size: 16px; filter: drop-shadow(0 1px 2px rgba(0,0,0,0.3)); }
.nav-ico-img { width: 22px; height: 22px; border-radius: 50%; object-fit: cover; border: 1.5px solid rgba(255,255,255,0.85); box-shadow: 0 1px 4px rgba(0,0,0,0.35); background: rgba(255,255,255,0.15); }
.sidebar .center-nav-bar .nav-item .nav-ico-img { width: 26px; height: 26px; }
.nav-txt { display: flex; flex-direction: column; line-height: 1.15; align-items: flex-start; font-size: 13.5px; font-weight: 700; }
.nav-en { font-size: 8.5px; font-weight: 500; letter-spacing: 1px; opacity: 0.55; text-transform: uppercase; }
@media (max-width: 1100px) { .nav-en { display: none; } .nav-item { justify-content: center; } }
@media (max-width: 768px) { .nav-no { display: none; } }

/* ===== Main ===== */
.main-container { padding: 20px 24px; max-width: 1860px; margin: 0 auto; }
.view-panel { display: none; animation: fadeIn 0.4s ease-in-out; }
.view-panel.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }

/* ===== KPI 行 ===== */
.kpi-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; margin-bottom: 14px; }
.kpi-card {
  background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 12px; padding: 9px 14px;
  box-shadow: var(--shadow-card); position: relative; overflow: hidden; transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}
.kpi-card:hover { transform: translateY(-2px); border-color: var(--theme-color); box-shadow: 0 6px 20px rgba(47,143,104,0.15); }
.kpi-card::before { content: ""; position: absolute; top: 0; left: 0; width: 4px; height: 100%; background: var(--theme-color); }
.kpi-card.accent-gold::before { background: var(--accent-gold); }
.kpi-card.accent-cyan::before { background: var(--accent-cyan); }
.kpi-label { font-size: 12px; color: var(--text-sub); margin-bottom: 3px; letter-spacing: 0.5px; }
.kpi-value { font-size: 23px; line-height: 1.15; font-weight: 700; color: var(--theme-color); font-family: 'SF Pro Display', -apple-system, monospace; }
.kpi-card.accent-gold .kpi-value { color: var(--accent-gold); }
.kpi-card.accent-cyan .kpi-value { color: var(--accent-cyan); }
.kpi-sub { font-size: 11.5px; color: var(--accent-cyan); margin-top: 2px; }

/* ===== 网格对齐优化 ===== */
.dashboard-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; align-items: stretch; }
.dashboard-grid.two { grid-template-columns: repeat(2, 1fr); align-items: stretch; }
.dashboard-grid.four { grid-template-columns: repeat(4, 1fr); align-items: stretch; }
@media (max-width: 1300px) { .dashboard-grid, .dashboard-grid.two, .dashboard-grid.four { grid-template-columns: 1fr; } }
/* 茶产业背景 · 时间轴(左, 索引) + 六大文化(右, 主体)：左窄右宽，时间轴作为索引引导 */
.dashboard-grid.timeline-culture { grid-template-columns: 0.72fr 1.28fr; }
@media (max-width: 1300px) {
  .dashboard-grid.timeline-culture { grid-template-columns: 1fr; }
}

.panel-box {
  background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 12px;
  padding: 16px 18px; margin-bottom: 18px; box-shadow: var(--shadow-card);
  display: flex; flex-direction: column; justify-content: flex-start;
}
.panel-header { display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--card-border); padding-bottom: 8px; margin-bottom: 12px; flex-shrink: 0; }
.panel-title { font-size: 16px; font-weight: 700; display: flex; align-items: center; gap: 8px; color: var(--text-main); }
.panel-tag { font-size: 10.5px; background: rgba(47,143,104,0.08); color: var(--theme-color); padding: 2px 8px; border-radius: 10px; border: 1px solid var(--card-border); font-weight: 600; flex-shrink: 0; }

/* ===== 数据表格自动换行与完美对齐 ===== */
.table-responsive { width: 100%; overflow-x: auto; flex: 1; }
.data-table { width: 100%; border-collapse: collapse; font-size: 12px; text-align: left; table-layout: auto; }
.data-table th { background: var(--table-header-bg); color: var(--text-main); padding: 8px 10px; font-weight: 700; border-bottom: 1px solid var(--card-border); white-space: nowrap; }
.data-table td { padding: 8px 10px; border-bottom: 1px solid var(--card-border); color: var(--text-main); vertical-align: middle; word-break: break-word; white-space: normal; }
.data-table tbody tr:hover { background: var(--table-hover-bg); }

/* ===== Badge ===== */
.badge-status { font-size: 10.5px; padding: 2px 6px; border-radius: 4px; font-weight: 600; display: inline-block; }
.badge-status.success { background: rgba(47,143,104,0.12); color: var(--theme-color); border: 1px solid rgba(47,143,104,0.3); }
.badge-status.warning { background: rgba(192,136,44,0.12); color: var(--accent-gold); border: 1px solid rgba(192,136,44,0.3); }
.badge-status.info { background: rgba(20,155,149,0.12); color: var(--accent-cyan); border: 1px solid rgba(20,155,149,0.3); }

/* ===== 数据 Badge 组 ===== */
.data-badge-group { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.data-badge { font-size: 11.5px; background: rgba(47,143,104,0.05); border: 1px solid var(--card-border); padding: 6px 10px; border-radius: 4px; color: var(--text-main); }
.data-badge strong { color: var(--theme-color); }

/* ===== 产业链步骤条 ===== */
.chain-timeline { display: flex; flex-direction: column; gap: 10px; }
.chain-step { background: rgba(47,143,104,0.03); border: 1px solid var(--card-border); border-left: 4px solid var(--theme-color); border-radius: 8px; padding: 11px 14px; transition: all 0.2s ease; }
.chain-step:hover { background: rgba(47,143,104,0.08); border-color: var(--theme-color); }
.step-num { font-size: 10.5px; font-weight: 700; color: var(--text-sub); margin-bottom: 2px; }
.step-title { font-size: 14px; font-weight: 700; color: var(--text-main); margin-bottom: 4px; }
.step-desc { font-size: 12.5px; color: var(--text-sub); }

/* ===== 弹幕滚动 ===== */
.marquee-box { overflow: hidden; position: relative; height: 180px; }
.marquee-list { display: flex; flex-direction: column; gap: 8px; animation: scrollUp 18s linear infinite; }
.marquee-list:hover { animation-play-state: paused; }
@keyframes scrollUp { 0% { transform: translateY(0); } 100% { transform: translateY(-50%); } }
.marquee-item { font-size: 12px; background: rgba(47,143,104,0.04); padding: 8px 12px; border-radius: 4px; display: flex; justify-content: space-between; align-items: center; border: 1px solid var(--card-border); border-left: 3px solid var(--theme-color); }

/* ===== 图表容器 ===== */
.chart-box { width: 100%; height: 240px; }

/* ===== 背景页：Hero ===== */
.bg-hero { background: linear-gradient(135deg, rgba(47,143,104,0.08), rgba(20,155,149,0.06)); border: 1px solid var(--card-border); border-radius: 14px; padding: 22px 24px; margin-bottom: 18px; position: relative; overflow: hidden; }
.bg-hero::after { content: "🍃"; position: absolute; right: 20px; top: 10px; font-size: 90px; opacity: 0.08; }
.bg-hero h2 { font-size: 22px; font-weight: 800; color: var(--theme-color); margin-bottom: 8px; letter-spacing: 1px; }
.bg-hero p { font-size: 13.5px; line-height: 1.9; color: var(--text-sub); max-width: 1000px; }

/* 时间轴 */
.timeline { position: relative; padding-left: 20px; }
.timeline::before { content: ""; position: absolute; left: 6px; top: 0; bottom: 0; width: 2px; background: var(--theme-color); opacity: 0.3; }
.tl-item { position: relative; margin-bottom: 14px; }
.tl-item::before { content: ""; position: absolute; left: -17px; top: 4px; width: 10px; height: 10px; border-radius: 50%; background: var(--theme-color); box-shadow: 0 0 0 3px var(--bg-color); }
.tl-year { font-size: 12.5px; font-weight: 800; color: var(--accent-gold); }
.tl-title { font-size: 14px; font-weight: 700; color: var(--text-main); margin: 2px 0; }
.tl-desc { font-size: 12.5px; color: var(--text-sub); line-height: 1.7; }

/* 文化/卡片网格 - 充实间距与内边距 */
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 4px; }
@media (max-width: 1000px) { .card-grid { grid-template-columns: 1fr; } }
.mini-card {
  background: rgba(47,143,104,0.03); border: 1px solid var(--card-border); border-radius: 10px;
  padding: 16px 16px; transition: all 0.2s ease; display: flex; flex-direction: column; justify-content: flex-start;
}
.mini-card:hover { background: rgba(47,143,104,0.07); border-color: var(--theme-color); }
.mini-card .mc-icon { font-size: 24px; margin-bottom: 4px; }
.mini-card .mc-name { font-size: 14.5px; font-weight: 700; color: var(--text-main); margin: 4px 0 6px; }
.mini-card .mc-era { display: inline-block; font-size: 10px; color: var(--accent-gold); border: 1px solid rgba(192,136,44,0.3); background: rgba(192,136,44,0.08); border-radius: 4px; padding: 1px 6px; margin: 0 0 6px; width: fit-content; }
.mini-card .mc-desc { font-size: 12.5px; color: var(--text-sub); line-height: 1.7; flex: 1; }

/* ===== 六大茶文化面板：导语 + KPI + 时间卷 ===== */
.panel-sub { font-size: 13px; color: var(--text-sub); line-height: 1.7; margin: 0 0 12px; padding: 0; }
.panel-sub b { color: var(--theme-color); font-weight: 700; }

.culture-kpis { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-bottom: 12px; }
.culture-kpi { background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 8px; padding: 8px 10px; position: relative; overflow: hidden; }
.culture-kpi::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px; background: linear-gradient(to bottom, var(--theme-color), var(--accent-cyan)); }
.culture-kpi .ck-label { font-size: 11.5px; color: var(--text-sub); font-weight: 600; }
.culture-kpi .ck-value { font-size: 19px; font-weight: 700; color: var(--theme-color); line-height: 1.2; margin: 2px 0 2px; }
.culture-kpi .ck-sub { font-size: 10.5px; color: var(--text-sub); }
@media (max-width: 1000px) { .culture-kpis { grid-template-columns: repeat(2, 1fr); } }

.culture-era {
  background: linear-gradient(135deg, rgba(47,143,104,0.06), rgba(20,155,149,0.04));
  border: 1px solid var(--card-border); border-radius: 10px; padding: 10px 12px;
  margin-bottom: 14px;
}
.era-head { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 8px; }
.era-head span { font-size: 13px; font-weight: 700; color: var(--theme-color); }
.era-head em { font-size: 10.5px; color: var(--text-sub); font-style: normal; }
.era-row { display: grid; grid-template-columns: repeat(6, 1fr); gap: 6px; }
.era-item {
  background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 8px;
  padding: 8px 8px; text-align: center; position: relative;
  transition: all .25s;
}
.era-item:hover { border-color: var(--theme-color); transform: translateY(-2px); box-shadow: 0 4px 12px rgba(47,143,104,0.12); }
.era-tag { display: inline-block; font-size: 10px; font-weight: 700; color: #fff; background: var(--theme-color); border-radius: 3px; padding: 1px 6px; margin-bottom: 4px; }
.era-name { font-size: 15px; font-weight: 700; color: var(--accent-gold); margin-bottom: 2px; }
.era-time { font-size: 9.5px; color: var(--text-sub); margin-bottom: 4px; min-height: 14px; }
.era-event { font-size: 11.5px; color: var(--text-main); line-height: 1.4; text-align: left; }
@media (max-width: 1200px) { .era-row { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 768px) { .era-row { grid-template-columns: repeat(2, 1fr); } .culture-kpis { grid-template-columns: 1fr; } }

/* 产区条 */
.region-row { margin-bottom: 14px; }
.region-head { display: flex; justify-content: space-between; align-items: baseline; font-size: 12.5px; margin-bottom: 4px; }
.region-head .r-name { font-weight: 700; color: var(--text-main); }
.region-head .r-val { color: var(--text-sub); font-size: 11.5px; }
.region-bar { height: 9px; background: rgba(47,143,104,0.1); border-radius: 5px; overflow: hidden; }
.region-bar > span { display: block; height: 100%; background: linear-gradient(90deg, var(--theme-color), var(--accent-cyan)); border-radius: 5px; }
.region-meta { font-size: 12px; color: var(--text-sub); margin-top: 4px; line-height: 1.5; }

/* 品牌墙 - 丰富标签布局与高度充实 */
.brand-wall { display: flex; flex-wrap: wrap; gap: 10px; padding: 6px 0; align-content: flex-start; flex: 1; }
.brand-chip { font-size: 12.5px; padding: 6px 14px; border-radius: 20px; background: rgba(47,143,104,0.06); border: 1px solid var(--card-border); color: var(--text-main); transition: all 0.2s ease; }
.brand-chip:hover { background: rgba(47,143,104,0.12); border-color: var(--theme-color); }
.brand-chip.hot { background: rgba(192,136,44,0.1); border-color: rgba(192,136,44,0.35); color: var(--accent-gold); font-weight: 600; }
.brand-list-row { display: flex; justify-content: space-between; align-items: center; padding: 10px 10px; border-bottom: 1px solid var(--card-border); font-size: 12.5px; }
.brand-list-row:last-child { border-bottom: none; }
.brand-list-row .bl-name { font-weight: 700; color: var(--text-main); font-size: 12.5px; }
.brand-list-row .bl-type { color: var(--accent-cyan); font-size: 11.5px; }
.brand-list-row .bl-note { color: var(--text-sub); font-size: 11.5px; text-align: right; max-width: 60%; line-height: 1.4; }

/* 痛点 / 方案 */
.pain-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 1000px) { .pain-grid { grid-template-columns: 1fr; } }
.psi-list { display: flex; flex-direction: column; gap: 8px; }
.psi-item { font-size: 12.5px; padding: 9px 12px; border-radius: 8px; border: 1px solid var(--card-border); line-height: 1.6; }
.psi-item.pain { background: rgba(192,136,44,0.06); border-left: 3px solid var(--accent-gold); }
.psi-item.sol { background: rgba(20,155,149,0.06); border-left: 3px solid var(--accent-cyan); }
.psi-item b { color: var(--text-main); }

/* 政策 / 荣誉 */
.policy-row { padding: 9px 12px; border-bottom: 1px solid var(--card-border); font-size: 12.5px; }
.policy-row .p-name { font-weight: 700; color: var(--theme-color); }
.policy-row .p-detail { color: var(--text-sub); margin-top: 2px; line-height: 1.6; }
.honor-row { display: flex; justify-content: space-between; align-items: center; padding: 9px 12px; border-bottom: 1px solid var(--card-border); font-size: 12.5px; }
.honor-row .h-name { font-weight: 700; color: var(--text-main); }
.honor-row .h-val { color: var(--accent-gold); font-weight: 700; }
.honor-row .h-rank { color: var(--text-sub); font-size: 10.5px; }

/* 指挥舱小卡 */
.cockpit-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; margin-bottom: 16px; }
@media (max-width: 900px) { .cockpit-grid { grid-template-columns: 1fr 1fr; } }
.cockpit-card { background: rgba(47,143,104,0.04); border: 1px solid var(--card-border); border-radius: 10px; padding: 12px 14px; text-align: center; }
.cockpit-card .cc-name { font-size: 12px; color: var(--text-sub); }
.cockpit-card .cc-val { font-size: 22px; font-weight: 800; color: var(--theme-color); margin: 4px 0; }
.cockpit-card .cc-note { font-size: 10.5px; color: var(--accent-cyan); }
.cockpit-card .cc-ico-img { width: 18px; height: 18px; border-radius: 4px; object-fit: cover; vertical-align: -4px; margin-right: 4px; }

/* 排行列表 */
.rank-list { display: flex; flex-direction: column; gap: 7px; }
.rank-item { display: flex; align-items: center; gap: 10px; font-size: 12.5px; }
.rank-item .rk-no { width: 20px; height: 20px; border-radius: 50%; background: var(--theme-color); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 10px; font-weight: 700; flex-shrink: 0; }
.rank-item .rk-name { width: 130px; color: var(--text-main); font-weight: 600; }
.rank-item .rk-bar { flex: 1; height: 8px; background: rgba(47,143,104,0.1); border-radius: 4px; overflow: hidden; }
.rank-item .rk-bar > span { display: block; height: 100%; background: var(--theme-color); }
.rank-item .rk-val { width: 80px; text-align: right; color: var(--text-sub); }

/* 监控指标 */
.monitor-list { display: flex; flex-direction: column; gap: 8px; }
.monitor-item { display: flex; justify-content: space-between; align-items: center; font-size: 12.5px; padding: 7px 10px; border: 1px solid var(--card-border); border-radius: 6px; background: rgba(47,143,104,0.03); }
.monitor-item .m-name { color: var(--text-sub); }
.monitor-item .m-val { color: var(--text-main); font-weight: 700; }

/* 视频占位 */
.video-ph { height: 220px; background: rgba(47,143,104,0.05); border-radius: 8px; border: 1px solid var(--card-border); display: flex; flex-direction: column; align-items: center; justify-content: center; position: relative; margin-bottom: 12px; }
.video-ph .rec { position: absolute; top: 10px; left: 10px; font-size: 11px; background: rgba(220,50,50,0.8); color: #fff; padding: 2px 8px; border-radius: 4px; }

/* 分隔标题 */
.section-gap { margin-top: 4px; }

/* 面板洞察脚注（减少留白、补充信息） */
.panel-insight { margin-top: 14px; font-size: 12.5px; line-height: 1.7; color: var(--text-sub);
  background: var(--card-sub-bg); border-left: 3px solid var(--accent-cyan); border-radius: 6px; padding: 9px 12px; }
.panel-insight b { color: var(--theme-color); font-weight: 700; }
.panel-insight .pi-tag { display: inline-block; font-size: 10px; font-weight: 700; color: #fff; background: var(--accent-cyan); border-radius: 4px; padding: 1px 6px; margin-right: 6px; }

/* ===================== 科幻 Hero Banner (横幅图 · 茶元素) ===================== */
.hero-banner {
  position: relative; overflow: hidden; border-radius: 14px; margin-bottom: 18px;
  padding: 22px 26px; display: flex; justify-content: space-between; align-items: center; gap: 20px;
  background:
    radial-gradient(900px 220px at 12% -25%, rgba(160,195,178,0.18), transparent 60%),
    linear-gradient(120deg, #3f5346 0%, #4e6658 48%, #44584c 100%);
  border: 1px solid rgba(150,180,165,0.28);
  box-shadow: 0 8px 30px rgba(28,40,32,0.26), inset 0 1px 0 rgba(255,255,255,0.08);
  color: #e6efe9;
}
/* 背景茶叶水墨水印 */
.hb-leaves-bg { position: absolute; right: 0; top: 0; width: 46%; height: 100%; pointer-events: none; opacity: 0.15; }
/* 主装饰：茶枝 SVG（置于右侧栏，与浮标同列，避免重叠） */
.hb-tea { width: 118px; height: 118px; opacity: 0.92; filter: drop-shadow(0 4px 14px rgba(0,0,0,0.32)); flex-shrink: 0; }
.hb-glow { position: absolute; right: -60px; top: -80px; width: 260px; height: 260px; border-radius: 50%;
  background: radial-gradient(circle, rgba(150,180,165,0.30), transparent 70%); filter: blur(8px); pointer-events: none; }
.hb-grid { position: absolute; inset: 0; pointer-events: none; opacity: 0.4;
  background-image: linear-gradient(rgba(150,180,165,0.07) 1px, transparent 1px), linear-gradient(90deg, rgba(150,180,165,0.07) 1px, transparent 1px);
  background-size: 28px 28px; mask-image: linear-gradient(120deg, #000, transparent 75%); }
.hb-left { position: relative; z-index: 2; max-width: 62%; }
.hb-en { font-family: "SF Mono", ui-monospace, monospace; font-size: 11.5px; letter-spacing: 3px; color: #a9c8ba; font-weight: 700; text-transform: uppercase; }
.hb-cn { font-size: 27px; font-weight: 800; margin: 4px 0 2px; letter-spacing: 1px; color: #fff; text-shadow: 0 2px 12px rgba(0,0,0,0.4); }
.hb-sub { font-size: 14px; color: #b9cfc4; font-weight: 600; margin-bottom: 8px; }
.hb-desc { font-size: 13.5px; line-height: 1.7; color: #cdd9d2; max-width: 640px; }
.hb-tag { display: inline-block; margin-top: 10px; font-size: 11px; padding: 3px 12px; border-radius: 20px;
  background: rgba(150,180,165,0.16); border: 1px solid rgba(150,180,165,0.38); color: #b9cfc4; font-weight: 600; letter-spacing: 1px; }
.hb-right { position: relative; z-index: 2; display: flex; flex-direction: column; align-items: center; gap: 10px; }
.hb-stats { display: flex; gap: 14px; }
.hb-stat { text-align: center; padding: 6px 12px; border-radius: 8px; background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.16); }
.hb-stat .s-v { font-size: 18px; font-weight: 800; color: #fff; }
.hb-stat .s-k { font-size: 10.5px; color: #b9cfc4; margin-top: 2px; }
.hb-scan { position: absolute; left: 0; right: 0; bottom: 0; height: 2px; z-index: 3;
  background: linear-gradient(90deg, transparent, var(--accent-cyan), transparent);
  animation: hbScan 3.2s linear infinite; }
@keyframes hbScan { 0% { transform: translateX(-100%); } 100% { transform: translateX(100%); } }
@media (max-width: 900px) { .hero-banner { flex-direction: column; align-items: flex-start; } .hb-right { flex-direction: row; } .hb-left { max-width: 100%; } }

/* ===================== 多元化卡片：环形进度卡 ===================== */
.ring-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin-top: 4px; }
.ring-card { display: flex; align-items: center; gap: 12px; background: var(--card-sub-bg); border: 1px solid var(--card-border); border-radius: 10px; padding: 14px 16px; }
.ring { --p: 70; width: 64px; height: 64px; border-radius: 50%; flex-shrink: 0; display: grid; place-items: center;
  background: conic-gradient(var(--ring-color, var(--theme-color)) calc(var(--p) * 1%), rgba(47,143,104,0.1) 0);
  position: relative; }
.ring::after { content: ""; position: absolute; inset: 7px; border-radius: 50%; background: var(--card-bg); }
.ring b { position: relative; z-index: 1; font-size: 15px; font-weight: 800; color: var(--theme-color); }
.ring-info { display: flex; flex-direction: column; }
.ring-info .r-label { font-size: 12.5px; font-weight: 700; color: var(--text-main); }
.ring-info .r-sub { font-size: 10.5px; color: var(--text-sub); margin-top: 2px; }

/* index2（左导航版）6 张 KPI 紧凑模式：缩为细条，6 张一行 */
body.compact-kpi .kpi-row { gap: 10px; margin-bottom: 14px; }
body.compact-kpi .kpi-row .kpi-card { padding: 10px 12px; }
body.compact-kpi .kpi-row .kpi-label { font-size: 11px; }
body.compact-kpi .kpi-row .kpi-value { font-size: 19px; margin: 2px 0 1px; }
body.compact-kpi .kpi-row .kpi-sub { font-size: 10.5px; }

/* 横向 LTV 进度条（替换原 .ring 在供应链金融卡片里的竖排问题） */
.ltv-bar { display: flex; align-items: center; gap: 10px; margin-top: 10px; flex-wrap: wrap; }
.ltv-bar .ltv-label { font-size: 11.5px; color: var(--text-sub); font-weight: 600; flex-shrink: 0; }
.ltv-bar .ltv-track { flex: 1 1 80px; height: 6px; background: rgba(86,107,92,0.14); border-radius: 3px; overflow: hidden; min-width: 60px; }
.ltv-bar .ltv-fill { display: block; height: 100%; background: linear-gradient(90deg, var(--theme-color), var(--accent-cyan)); border-radius: 3px; }
.ltv-bar .ltv-val { font-size: 14px; font-weight: 800; color: var(--accent-cyan); flex-shrink: 0; }
.ltv-bar .ltv-basis { font-size: 10.5px; color: var(--text-sub); padding: 2px 8px; background: var(--card-sub-bg); border-radius: 10px; border: 1px solid var(--card-border); flex-shrink: 0; }

/* ===================== 多元化卡片：特性卡（左侧色条） ===================== */
.feat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; margin-top: 4px; }
.feat-card { position: relative; background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 10px; padding: 14px 16px 14px 18px; overflow: hidden; transition: all .25s; }
.feat-card::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: var(--feat-color, var(--theme-color)); }
.feat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-card); border-color: var(--feat-color, var(--theme-color)); }
.feat-card .f-top { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; }
.feat-card .f-ico { font-size: 18px; }
.feat-card .f-name { font-size: 14.5px; font-weight: 700; color: var(--text-main); }
.feat-card .f-desc { font-size: 12.5px; color: var(--text-sub); line-height: 1.65; }
.feat-card .f-meta { margin-top: 8px; }
.feat-card .f-tag { display: inline-block; font-size: 10px; padding: 2px 8px; border-radius: 4px; background: rgba(47,143,104,0.07); border: 1px solid var(--card-border); color: var(--theme-color); font-weight: 600; margin-right: 6px; }

/* ===================== 多元化卡片：标签云 ===================== */
.chip-cloud { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 4px; }
.chip { font-size: 12.5px; padding: 6px 12px; border-radius: 20px; background: var(--card-sub-bg); border: 1px solid var(--card-border); color: var(--text-main); transition: all .2s; }
.chip:hover { background: rgba(47,143,104,0.08); border-color: var(--theme-color); color: var(--theme-color); transform: translateY(-1px); }
.chip .c-dot { color: var(--accent-cyan); margin-right: 4px; }

/* ===================== 抵质押合作生态矩阵卡片 ===================== */
.coop-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 10px; margin-top: 4px; }
.coop-card { background: var(--card-sub-bg); border: 1px solid var(--card-border); border-radius: 10px; padding: 12px 14px; transition: all 0.22s ease; }
.coop-card:hover { border-color: var(--theme-color); transform: translateY(-2px); box-shadow: var(--shadow-card); }
.coop-top { display: flex; align-items: center; gap: 6px; margin-bottom: 6px; }
.coop-ico { font-size: 16px; }
.coop-role { font-size: 12px; font-weight: 700; color: var(--text-main); flex: 1; }
.coop-tag { font-size: 9.5px; padding: 1px 7px; border-radius: 10px; background: rgba(111,138,118,0.12); color: var(--theme-color); border: 1px solid var(--card-border); font-weight: 600; white-space: nowrap; }
.coop-name { font-size: 13px; font-weight: 700; color: var(--theme-color); line-height: 1.35; margin-bottom: 4px; }
.coop-note { font-size: 11.5px; color: var(--text-sub); line-height: 1.6; }

/* ===================== 首屏登录界面 ===================== */
.login-screen {
  position: fixed; inset: 0; z-index: 9999; display: flex; align-items: center; justify-content: center;
  background:
    radial-gradient(1000px 400px at 18% -10%, rgba(160,195,178,0.14), transparent 60%),
    linear-gradient(135deg, #2a382f 0%, #3c5145 55%, #2f4136 100%);
  transition: opacity 0.5s ease, visibility 0.5s ease;
}
.login-screen.hidden { opacity: 0; visibility: hidden; pointer-events: none; }
.login-bg-leaves { position: absolute; right: 0; bottom: 0; width: 38%; height: 60%; pointer-events: none; opacity: 0.10; }
.login-card {
  position: relative; z-index: 2; width: 380px; max-width: 90vw; padding: 30px 30px 26px;
  background: #ffffff; border-radius: 16px; border: 1px solid rgba(111,138,118,0.25);
  box-shadow: 0 24px 70px rgba(20,30,24,0.45);
  animation: loginPop 0.5s ease;
}
@keyframes loginPop { from { transform: translateY(14px) scale(0.97); opacity: 0; } to { transform: translateY(0) scale(1); opacity: 1; } }
.login-card.shake { animation: loginShake 0.42s ease; }
@keyframes loginShake { 0%,100%{transform:translateX(0)} 20%{transform:translateX(-9px)} 40%{transform:translateX(8px)} 60%{transform:translateX(-6px)} 80%{transform:translateX(4px)} }
.login-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 4px; }
.login-brand .lb-logo { background: var(--theme-color); color: #fff; font-weight: 800; font-size: 13px; padding: 4px 12px; border-radius: 6px; letter-spacing: 1px; }
.login-brand .lb-en { font-family: "SF Mono", ui-monospace, monospace; font-size: 10px; letter-spacing: 2px; color: var(--text-sub); }
.login-title { font-size: 21px; font-weight: 800; color: #2f4136; margin: 10px 0 2px; letter-spacing: 0.5px; }
.login-sub { font-size: 12px; color: var(--text-sub); margin-bottom: 20px; }
.login-field { margin-bottom: 14px; }
.login-field label { display: block; font-size: 12px; font-weight: 600; color: var(--text-sub); margin-bottom: 6px; }
.login-input {
  width: 100%; padding: 11px 14px; font-size: 15px; color: var(--text-main);
  background: #f5f7f5; border: 1px solid var(--card-border); border-radius: 8px; outline: none;
  letter-spacing: 1px; transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.login-input:focus { border-color: var(--theme-color); box-shadow: 0 0 0 3px rgba(111,138,118,0.14); }
.login-input[readonly] { color: var(--theme-color); font-weight: 700; background: rgba(111,138,118,0.06); }
.login-btn {
  width: 100%; padding: 11px; margin-top: 4px; border: none; border-radius: 8px; cursor: pointer;
  background: var(--theme-color); color: #fff; font-size: 15px; font-weight: 700; letter-spacing: 2px;
  transition: opacity 0.2s ease, transform 0.1s ease;
}
.login-btn:hover { opacity: 0.92; }
.login-btn:active { transform: translateY(1px); }
.login-error { color: #b05a3c; font-size: 12px; margin-top: 10px; min-height: 16px; text-align: center; font-weight: 600; }
.login-hint { margin-top: 12px; font-size: 11px; color: var(--text-sub); text-align: center; line-height: 1.6; }
.login-hint b { color: var(--theme-color); }

/* ===================== index2 左侧导航布局 ===================== */
/* 作用域限定在 .app-layout，不影响原 index.html 的顶部导航版式 */
.app-layout { display: flex; align-items: stretch; min-height: 100vh; }

/* 左侧栏 */
.sidebar {
  width: 264px; flex-shrink: 0;
  background: var(--header-bg);
  border-right: 1px solid var(--card-border);
  box-shadow: 4px 0 22px rgba(0,0,0,0.12);
  display: flex; flex-direction: column;
  position: sticky; top: 0; height: 100vh; z-index: 90;
}
.sidebar-brand {
  display: flex; align-items: center; gap: 12px;
  padding: 20px 20px 16px 20px;
  border-bottom: 1px solid rgba(255,255,255,0.12);
}
.sidebar-brand .brand-logo { font-size: 13px; padding: 5px 12px; }
.sidebar-brand .sb-title { font-size: 17px; font-weight: 700; color: #fff; letter-spacing: 1px; }
.sidebar-brand .sb-sub { font-size: 10.5px; color: rgba(255,255,255,0.7); margin-top: 3px; letter-spacing: .5px; }

/* 垂直导航（覆盖默认横向 .center-nav-bar 行为，仅作用于侧栏内） */
.sidebar .center-nav-bar {
  flex-direction: column; gap: 8px; align-items: stretch;
  padding: 16px 14px; flex: 1 1 auto; overflow-y: auto;
}
.sidebar .center-nav-bar .nav-item {
  flex: 0 0 auto; width: 100%; justify-content: flex-start;
  padding: 12px 14px; gap: 12px;
}
.sidebar .center-nav-bar .nav-item::after { display: none; }
.sidebar .center-nav-bar .nav-item .nav-ico { font-size: 18px; }
.sidebar .center-nav-bar .nav-item .nav-txt { font-size: 14px; }

.sidebar-foot {
  padding: 14px 18px; border-top: 1px solid rgba(255,255,255,0.12);
  display: flex; flex-direction: column; gap: 6px;
}
.sf-line { display: flex; align-items: center; gap: 8px; font-size: 11.5px; color: rgba(255,255,255,0.82); font-weight: 600; }
.sf-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent-cyan); box-shadow: 0 0 8px var(--accent-cyan); }
.sf-muted { color: rgba(255,255,255,0.55); font-weight: 500; font-size: 10.5px; }

/* 右侧主区 */
.app-main { flex: 1 1 auto; min-width: 0; display: flex; flex-direction: column; }
.topbar {
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 24px; background: var(--header-bg);
  border-bottom: 1px solid var(--card-border); position: sticky; top: 0; z-index: 80;
}
.topbar-title .tt-cn { font-size: 19px; font-weight: 700; color: #fff; letter-spacing: 1px; }
.topbar-title .tt-en { font-size: 11px; color: rgba(255,255,255,0.7); margin-top: 3px; letter-spacing: .5px; }
.topbar .header-status { gap: 14px; }

/* 窄屏：侧栏收窄，隐藏英文小标 */
@media (max-width: 1100px) {
  .sidebar { width: 220px; }
  .sidebar .center-nav-bar .nav-item .nav-en { display: none; }
}
@media (max-width: 820px) {
  .app-layout { flex-direction: column; }
  .sidebar { width: 100%; height: auto; position: static; flex-direction: row; flex-wrap: wrap; align-items: center; }
  .sidebar-brand { border-bottom: none; border-right: 1px solid rgba(255,255,255,0.12); }
  .sidebar .center-nav-bar { flex-direction: row; flex-wrap: wrap; flex: 1 1 auto; }
}

/* ===================== index.html 专用：banner 下 KPI 卡强制单行 ===================== */
/* 仅作用于顶部导航版（body.single-row-kpi），不影响 index2 左导航版 */
body.single-row-kpi .kpi-row {
  display: flex; flex-wrap: wrap; gap: 14px;
}
body.single-row-kpi .kpi-row .kpi-card {
  flex: 1 1 calc((100% - 70px) / 6);
  max-width: calc((100% - 70px) / 6);
  min-width: 150px;
}

/* ===================== 图标小图 ===================== */
/* 填满原 emoji 图标盒，保持原比例；加载失败回退 emoji */
.ico-img { display: block; width: 100%; height: 100%; object-fit: cover; border-radius: inherit; }
.mini-card .mc-icon { display: flex; align-items: center; justify-content: center; width: 36px; height: 36px;
  margin-bottom: 4px; border-radius: 50%; background: rgba(111,138,118,0.12); overflow: hidden; }
.feat-card .f-ico { display: flex; align-items: center; justify-content: center; flex: 0 0 auto;
  width: 30px; height: 30px; border-radius: 8px; background: rgba(111,138,118,0.12); overflow: hidden; }
.coop-card .coop-ico { display: flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; border-radius: 8px; background: rgba(111,138,118,0.12); overflow: hidden; }

/* 视频监控位：真实茶园照片作底图 + 主题底色蒙版 */
.video-ph { height: 220px; background: var(--card-sub-bg); border-radius: 8px; border: 1px solid var(--card-border);
  display: flex; flex-direction: column; align-items: center; justify-content: center; position: relative; margin-bottom: 12px; overflow: hidden; }
.video-ph-img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; border-radius: 8px; z-index: 0; }
.video-ph::after { content: ""; position: absolute; inset: 0; background: var(--vp-scrim); border-radius: 8px; z-index: 1; }
.video-ph > *:not(.video-ph-img) { position: relative; z-index: 2; }

/* ===== 产业链全景 · 右下角悬浮"可体验"按钮（全程链路 + 双系统联动） ===== */
.chain-floaters { position: fixed; right: 22px; bottom: 22px; z-index: 60; display: flex;
  flex-direction: column; gap: 12px; align-items: flex-end; }
.fab-wrap { position: relative; }
.fab { display: inline-flex; align-items: center; gap: 8px; cursor: pointer; padding: 11px 16px;
  border: 1px solid var(--theme-color); border-radius: 26px; color: #fff; font-size: 13.5px; font-weight: 600;
  letter-spacing: .5px; font-family: inherit; background: linear-gradient(135deg, var(--theme-color), #3f5346);
  box-shadow: 0 8px 22px rgba(47,143,104,.32); transition: transform .2s, box-shadow .2s; }
.fab:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(47,143,104,.42); }
.fab-ico { font-size: 16px; line-height: 1; }
.fab-sys { background: linear-gradient(135deg, var(--accent-gold), #8a6f33); border-color: var(--accent-gold);
  box-shadow: 0 8px 22px rgba(167,138,78,.30); }
.fab-sys:hover { box-shadow: 0 12px 28px rgba(167,138,78,.42); }

/* 弹出面板（鼠标移入 / 点击固定均显示） */
.fab-pop { position: absolute; right: calc(100% + 6px); bottom: 0; width: 332px;
  background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 14px;
  box-shadow: 0 16px 40px rgba(20,30,24,.28); padding: 14px; opacity: 0; visibility: hidden;
  transform: translateX(12px); transition: opacity .22s ease, transform .22s ease, visibility .22s; }
.fab-wrap:hover .fab-pop, .fab-wrap.open .fab-pop { opacity: 1; visibility: visible; transform: none; }
/* 桥接区：填补按钮与面板之间的空隙，避免移入时 hover 丢失 */
.fab-wrap::after { content: ""; position: absolute; right: calc(100% + 2px); bottom: 0; width: 12px; height: 360px; }
.fp-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 4px; }
.fp-title { font-size: 14px; font-weight: 700; color: var(--theme-color); }
.fp-badge { font-size: 10.5px; color: #fff; background: var(--accent-cyan); padding: 2px 8px; border-radius: 10px; }
.fp-tip { font-size: 11px; color: var(--text-sub); margin-bottom: 10px; line-height: 1.5; }

/* 全程链路节点 */
.nf-list { display: flex; flex-direction: column; gap: 8px; max-height: 360px; overflow: auto; }
.nf-node { position: relative; border: 1px solid var(--card-border); border-left: 3px solid var(--theme-color);
  border-radius: 9px; padding: 9px 11px; cursor: pointer; background: rgba(86,107,92,.04);
  transition: background .18s, transform .18s; }
.nf-node:hover { background: rgba(86,107,92,.12); transform: translateX(2px); }
.nf-top { display: flex; align-items: center; gap: 7px; }
.nf-no { font-size: 10.5px; font-weight: 700; color: #fff; background: var(--theme-color); border-radius: 6px; padding: 1px 7px; }
.nf-ico { width: 18px; height: 18px; border-radius: 5px; object-fit: cover; }
.nf-tag { font-size: 10.5px; color: var(--text-sub); margin-left: auto; }
.nf-title { font-size: 12.5px; font-weight: 600; color: var(--text-main); margin-top: 5px; }
.nf-support { font-size: 10.5px; color: var(--accent-cyan); margin-top: 2px; line-height: 1.45; }
.nf-go { position: absolute; right: 11px; bottom: 9px; font-size: 10.5px; color: var(--theme-color); font-weight: 700; opacity: 0; transition: opacity .18s; }
.nf-node:hover .nf-go { opacity: 1; }

/* 双系统卡片 */
.nf-sys-list { display: flex; flex-direction: column; gap: 9px; }
.nf-sys { display: flex; align-items: center; gap: 9px; border: 1px solid var(--card-border); border-radius: 9px;
  padding: 10px 11px; cursor: pointer; background: rgba(167,138,78,.06); transition: background .18s, transform .18s; }
.nf-sys:hover { background: rgba(167,138,78,.14); transform: translateX(2px); }
.nf-sys .nf-ico { width: 22px; height: 22px; border-radius: 6px; flex: none; }
.nf-sys-body { flex: 1; }
.nf-sys-name { font-size: 12.5px; font-weight: 600; color: var(--text-main); }
.nf-sys-sub { font-size: 10.5px; color: var(--text-sub); margin-top: 2px; line-height: 1.4; }
.nf-sys .nf-go { position: static; opacity: 1; color: var(--accent-gold); }

/* 暗黑主题下微调悬浮按钮亮度 */
body.dark-theme .fab { box-shadow: 0 8px 22px rgba(136,163,147,.30); }
body.dark-theme .fab:hover { box-shadow: 0 12px 28px rgba(136,163,147,.42); }

/* ===== 全局快速置顶 ===== */
.back-to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 70;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border: 1px solid var(--theme-color);
  border-radius: 50%;
  background: var(--card-bg);
  color: var(--theme-color);
  box-shadow: 0 8px 22px rgba(20,30,24,.18);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity .22s ease, visibility .22s ease, transform .22s ease, background-color .22s ease;
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: none; }
.back-to-top:hover { background: var(--theme-color); color: #fff; transform: translateY(-2px); }
.back-to-top:focus-visible { outline: 3px solid rgba(95,138,128,.36); outline-offset: 3px; }
.back-to-top span { font-size: 24px; line-height: 1; font-weight: 700; }
.back-to-top { bottom: 84px; }
body.dark-theme .back-to-top { box-shadow: 0 8px 22px rgba(0,0,0,.42); }

@media (max-width: 600px) {
  .back-to-top { right: 14px; bottom: 14px; width: 40px; height: 40px; }
  .back-to-top { bottom: 72px; }
}