/* ==================================================================
   KRON · 官网 landing
   ================================================================== */

.landing { --max: 1440px; }

/* ---------- 导航 ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  height: 68px; padding: 0 max(24px, 4vw);
  display: flex; align-items: center; gap: 36px;
  border-bottom: 1px solid rgba(45, 226, 255, 0.08);
  background: rgba(4, 6, 10, 0.72);
  backdrop-filter: blur(14px) saturate(1.2);
}
.nav .logo { display: flex; align-items: center; gap: 11px; color: var(--ink); }
.nav .logo .mark {
  width: 34px; height: 34px; display: grid; place-items: center;
  border: 1px solid var(--cyan); color: var(--cyan);
  font-family: var(--font-display); font-weight: 700; font-size: 17px;
  clip-path: polygon(0 0, 100% 0, 100% 68%, 68% 100%, 0 100%);
  box-shadow: inset 0 0 18px rgba(45, 226, 255, .18), 0 0 16px rgba(45, 226, 255, .12);
}
.nav .logo .word b {
  display: block; font-family: var(--font-display); font-size: 15px; letter-spacing: 0.28em; line-height: 1;
}
.nav .logo .word i {
  display: block; font-style: normal; font-family: var(--font-mono);
  font-size: 7.5px; letter-spacing: 0.18em; color: var(--mute); margin-top: 4px;
}
.nav .links { display: flex; gap: 28px; margin-left: 20px; }
.nav .links a {
  font-size: 12.5px; color: var(--ink-2); letter-spacing: 0.06em;
  position: relative; padding: 6px 0;
}
.nav .links a::after {
  content: ""; position: absolute; left: 0; bottom: 0; width: 0; height: 1px;
  background: var(--cyan); transition: width .3s var(--ease);
  box-shadow: 0 0 8px var(--cyan);
}
.nav .links a:hover { color: var(--cyan); }
.nav .links a:hover::after { width: 100%; }
.nav-cta { margin-left: auto; display: flex; gap: 10px; }
.nav-burger { display: none; margin-left: auto; background: transparent; border: 1px solid var(--line); color: var(--ink); width: 38px; height: 34px; font-size: 18px; cursor: pointer; }

/* ---------- 首屏 ---------- */
.hero {
  max-width: var(--max); margin: 0 auto;
  padding: 148px max(24px, 4vw) 70px;
  display: grid; grid-template-columns: 1.04fr 0.96fr; gap: 48px; align-items: center;
  min-height: 100vh;
}
.hero-copy { display: flex; flex-direction: column; gap: 26px; }
.hero h1 {
  font-size: clamp(46px, 5.6vw, 86px);
  line-height: 0.96;
  letter-spacing: -0.02em;
  font-weight: 700;
}
.hero h1 .accent {
  background: linear-gradient(100deg, #bff8ff 0%, var(--cyan) 38%, #7a8cff 78%, var(--violet) 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  filter: drop-shadow(0 0 26px rgba(45, 226, 255, .25));
  position: relative;
}
.hero h1 .accent::after {
  content: "变成秩序。"; position: absolute; inset: 0; color: var(--cyan);
  opacity: 0; animation: glitch 7s steps(1) infinite;
}
@keyframes glitch {
  0%, 92%, 100% { opacity: 0; }
  93% { opacity: .35; transform: translate(2px, -1px); clip-path: inset(20% 0 60% 0); }
  94% { opacity: 0; }
  96% { opacity: .3; transform: translate(-2px, 1px); clip-path: inset(55% 0 20% 0); }
  97% { opacity: 0; }
}
.hero .lead { font-size: 15.5px; line-height: 1.85; color: var(--ink-2); max-width: 520px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-actions .ar { font-family: var(--font-mono); }
.hero-stats { display: flex; gap: 34px; padding-top: 22px; border-top: 1px solid var(--line); }
.hs { display: flex; flex-direction: column; gap: 5px; }
.hs b { font-size: 24px; font-weight: 600; color: var(--ink); letter-spacing: 0.02em; }
.hs b::after { content: ""; }
.hs span { font-size: 11px; color: var(--mute); letter-spacing: 0.04em; }

.hero-visual { position: relative; }
.visual-frame {
  position: relative; aspect-ratio: 1 / 1.06;
  border: 1px solid var(--line-strong);
  background:
    radial-gradient(70% 60% at 50% 30%, rgba(45, 226, 255, .08), transparent 70%),
    linear-gradient(180deg, rgba(8, 14, 22, .9), rgba(4, 7, 11, .95));
  box-shadow: 0 40px 120px rgba(0, 0, 0, .55), inset 0 0 80px rgba(45, 226, 255, .05);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 22px 100%, 0 calc(100% - 22px));
}
.visual-frame canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.vf-corner { position: absolute; width: 22px; height: 22px; border-color: var(--cyan); opacity: .8; }
.vf-corner.tl { top: 10px; left: 10px; border-left: 1px solid; border-top: 1px solid; }
.vf-corner.tr { top: 10px; right: 10px; border-right: 1px solid; border-top: 1px solid; }
.vf-corner.bl { bottom: 10px; left: 10px; border-left: 1px solid; border-bottom: 1px solid; }
.vf-corner.br { bottom: 10px; right: 10px; border-right: 1px solid; border-bottom: 1px solid; }
.vf-hud { position: absolute; left: 20px; right: 20px; display: flex; justify-content: space-between; font-family: var(--font-mono); font-size: 9px; letter-spacing: .18em; color: var(--mute); }
.vf-hud.top { top: 16px; }
.vf-hud.top .dot { margin-right: 6px; }
.vf-hud.bottom {
  bottom: 16px; left: 16px; right: 16px;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px;
  padding-top: 12px; border-top: 1px solid rgba(45, 226, 255, .12);
}
.vf-hud.bottom div { display: flex; flex-direction: column; gap: 3px; }
.vf-hud.bottom em { font-style: normal; font-size: 8px; color: var(--mute-2); letter-spacing: .14em; }
.vf-hud.bottom b { font-size: 12px; color: var(--ink); letter-spacing: .04em; }
.hero-badge {
  position: absolute; right: -12px; top: 26px;
  display: flex; flex-direction: column; gap: 2px; align-items: flex-end;
  padding: 8px 12px; border: 1px solid var(--line-strong);
  background: rgba(4, 8, 13, .9);
  font-family: var(--font-mono); font-size: 8px; letter-spacing: .16em; color: var(--mute);
  backdrop-filter: blur(8px);
}
.hero-badge .mono { color: var(--cyan); font-size: 11px; letter-spacing: .2em; }

/* ---------- ticker ---------- */
.ticker { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); overflow: hidden; background: rgba(45, 226, 255, .02); }
.ticker-track {
  display: flex; align-items: center; gap: 26px; white-space: nowrap;
  padding: 12px 0; width: max-content;
  animation: tickerMove 38s linear infinite;
}
.ticker-track span { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .24em; color: var(--mute); }
.ticker-track i { font-style: normal; color: var(--cyan); opacity: .5; font-size: 8px; }
@keyframes tickerMove { to { transform: translateX(-50%); } }

/* ---------- 通用 section ---------- */
.section { max-width: var(--max); margin: 0 auto; padding: 104px max(24px, 4vw); }
.section-head { display: grid; grid-template-columns: 1.15fr .85fr; gap: 40px; align-items: end; margin-bottom: 52px; }
.section-head h2 { font-size: clamp(30px, 3.4vw, 48px); line-height: 1.08; letter-spacing: -0.01em; margin-top: 14px; }
.section-lead { font-size: 13.5px; line-height: 1.9; color: var(--mute); max-width: 420px; }
.section-lead.small { font-size: 12.5px; }

/* ---------- 问题 ---------- */
.problem { padding-top: 90px; }
.waste-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.waste-card {
  position: relative; padding: 28px 26px 26px;
  border: 1px solid var(--line); background: rgba(9, 15, 23, .55);
  overflow: hidden;
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
}
.waste-card::after {
  content: ""; position: absolute; left: 0; top: 0; width: 34px; height: 2px;
  background: linear-gradient(90deg, var(--cyan), transparent);
}
.wc-num { display: block; font-size: 46px; font-weight: 600; line-height: 1; color: var(--ink); letter-spacing: -0.02em; }
.wc-num em { font-style: normal; font-size: 15px; color: var(--cyan); margin-left: 4px; letter-spacing: 0; }
.waste-card b { display: block; margin: 16px 0 8px; font-size: 13.5px; color: var(--ink); }
.waste-card p { font-size: 12.5px; color: var(--mute); line-height: 1.8; }

.compare { margin-top: 34px; padding: 26px 30px; border: 1px solid var(--line); background: rgba(7, 11, 17, .6); }
.compare-row { display: grid; grid-template-columns: 100px 1fr 88px; align-items: center; gap: 18px; margin-bottom: 14px; }
.cr-label { font-family: var(--font-mono); font-size: 10px; letter-spacing: .16em; color: var(--mute); }
.cr-bar { height: 8px; background: rgba(255, 255, 255, .05); overflow: hidden; }
.cr-bar i { display: block; height: 100%; background: linear-gradient(90deg, #33414d, #55697a); }
.compare-row.k .cr-bar i { background: linear-gradient(90deg, var(--cyan-dim), var(--cyan)); box-shadow: 0 0 18px rgba(45, 226, 255, .55); }
.cr-val { font-family: var(--font-mono); font-size: 12px; text-align: right; color: var(--ink-2); }
.compare-row.k .cr-val { color: var(--cyan); }
.compare-note { display: flex; align-items: center; gap: 12px; font-size: 12.5px; color: var(--mute); padding-top: 16px; border-top: 1px solid var(--line); }

/* ---------- Demo ---------- */
.demo { display: grid; grid-template-columns: 360px 1fr; gap: 18px; align-items: stretch; }
.demo-controls { padding: 22px; display: flex; flex-direction: column; gap: 22px; }
.dc-block { display: flex; flex-direction: column; gap: 10px; }
.dc-row { display: flex; align-items: center; justify-content: space-between; }
.type-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; }
.type-grid button {
  height: 34px; border: 1px solid var(--line); background: rgba(4, 8, 13, .6);
  color: var(--mute); font-size: 11.5px; cursor: pointer; font-family: var(--font-body);
  transition: all .2s var(--ease);
}
.type-grid button:hover { color: var(--ink); border-color: var(--line-strong); }
.type-grid button.active { background: rgba(45, 226, 255, .12); color: var(--cyan); border-color: var(--cyan); }

.range {
  -webkit-appearance: none; appearance: none; width: 100%; height: 3px;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--cyan) var(--p, 50%), rgba(255, 255, 255, .08) var(--p, 50%));
  outline: none; cursor: pointer;
}
.range::-webkit-slider-thumb {
  -webkit-appearance: none; width: 14px; height: 14px; background: #05080d;
  border: 1px solid var(--cyan); box-shadow: 0 0 12px var(--cyan);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
}
.range.violet { background: linear-gradient(90deg, var(--violet) 0%, var(--violet) var(--p, 50%), rgba(255, 255, 255, .08) var(--p, 50%)); }
.range.violet::-webkit-slider-thumb { border-color: var(--violet); box-shadow: 0 0 12px var(--violet); }
.range-ticks { display: flex; justify-content: space-between; font-size: 9px; color: var(--mute-2); letter-spacing: .1em; }

.demo-readouts { display: grid; grid-template-columns: 1fr 1fr; gap: 14px 10px; padding-top: 18px; border-top: 1px solid var(--line); }
.dr { display: flex; flex-direction: column; gap: 4px; }
.dr em { font-style: normal; font-family: var(--font-mono); font-size: 8.5px; letter-spacing: .16em; color: var(--mute-2); text-transform: uppercase; }
.dr b { font-size: 16px; font-weight: 500; color: var(--ink); }
.dc-status { display: flex; align-items: center; gap: 8px; font-size: 9px; letter-spacing: .18em; color: var(--mute-2); padding-top: 10px; border-top: 1px solid var(--line); }

.demo-stage { position: relative; min-height: 520px; overflow: hidden; background: radial-gradient(70% 60% at 55% 35%, rgba(45, 226, 255, .07), transparent 70%), #05080d; }
.demo-stage canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.stage-tabs { position: absolute; top: 14px; left: 14px; display: flex; gap: 0; border: 1px solid var(--line); background: rgba(4, 8, 13, .8); backdrop-filter: blur(6px); }
.stage-tabs button {
  border: 0; background: transparent; color: var(--mute); height: 30px; padding: 0 14px;
  font-size: 11px; cursor: pointer; border-right: 1px solid var(--line); font-family: var(--font-body);
}
.stage-tabs button:last-child { border-right: 0; }
.stage-tabs button.active { background: rgba(45, 226, 255, .14); color: var(--cyan); }
.stage-hint { position: absolute; right: 14px; bottom: 12px; font-size: 9px; letter-spacing: .14em; color: var(--mute-2); }

/* ---------- 模块 ---------- */
.mod-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.mod-card {
  position: relative; grid-column: span 1; padding: 26px 24px 22px;
  border: 1px solid var(--line); background: linear-gradient(180deg, rgba(11, 17, 26, .8), rgba(6, 10, 15, .7));
  overflow: hidden; transition: all .35s var(--ease);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
  display: flex; flex-direction: column;
}
.mod-card::before {
  content: ""; position: absolute; inset: 0; opacity: 0;
  background: radial-gradient(70% 90% at 20% 0%, rgba(45, 226, 255, .1), transparent 60%);
  transition: opacity .35s var(--ease);
}
.mod-card:hover { border-color: var(--line-strong); transform: translateY(-3px); box-shadow: 0 30px 60px rgba(0, 0, 0, .4); }
.mod-card:hover::before { opacity: 1; }
.mod-card.wide { grid-column: span 2; grid-row: span 2; min-height: 380px; }
.mod-idx { position: absolute; top: 14px; right: 18px; font-size: 10px; letter-spacing: .18em; color: var(--mute-2); }
.mod-card h3 { font-size: 21px; margin: 8px 0 10px; }
.mod-card.wide h3 { font-size: 30px; margin: 10px 0 14px; }
.mod-card p { font-size: 12.5px; color: var(--mute); line-height: 1.85; position: relative; }
.mod-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-top: auto; padding-top: 16px; position: relative; }
.mod-viz { position: relative; flex: 1; min-height: 130px; margin-top: 10px; opacity: .9; }
.mod-viz canvas { width: 100%; height: 100%; }
.mod-card.cta-mod {
  justify-content: center; gap: 12px; text-decoration: none;
  background: radial-gradient(90% 120% at 20% 0%, rgba(45, 226, 255, .16), transparent 60%), linear-gradient(180deg, rgba(12, 22, 32, .9), rgba(6, 10, 15, .8));
  border-color: rgba(45, 226, 255, .28);
}
.mod-card.cta-mod h3 { font-size: 24px; margin: 0; }
.mod-card.cta-mod p { margin-bottom: 6px; }
.mod-card.cta-mod .btn { align-self: flex-start; }

/* ---------- 角色 ---------- */
.role-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.role-card { padding: 26px 24px; display: flex; flex-direction: column; gap: 14px; }
.rc-head { display: flex; justify-content: space-between; align-items: center; font-size: 9px; letter-spacing: .2em; color: var(--mute); }
.role-card h3 { font-size: 22px; }
.role-card ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.role-card li { position: relative; padding-left: 18px; font-size: 12.5px; color: var(--ink-2); line-height: 1.6; }
.role-card li::before { content: "▸"; position: absolute; left: 0; color: var(--cyan); font-size: 10px; top: 2px; }
.role-card .btn { margin-top: 6px; }

/* ---------- 案例 ---------- */
.cases { padding-top: 80px; }
.case-score { display: flex; flex-direction: column; align-items: flex-end; gap: 4px; }
.case-score b { font-size: 40px; color: var(--cyan); line-height: 1; }
.case-score span { font-size: 11px; color: var(--mute); }
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.case-skel { height: 220px; opacity: .5; }
.case-card { padding: 24px; display: flex; flex-direction: column; gap: 16px; position: relative; }
.case-card .quote-mark { font-family: Georgia, serif; font-size: 44px; line-height: .6; color: var(--cyan); opacity: .5; }
.case-card p { font-size: 13px; color: var(--ink-2); line-height: 1.85; flex: 1; }
.case-meta { display: flex; justify-content: space-between; align-items: center; font-size: 10.5px; color: var(--mute); border-top: 1px solid var(--line); padding-top: 14px; }
.case-tags { display: flex; gap: 6px; flex-wrap: wrap; }

/* ---------- CTA ---------- */
.cta { padding: 40px max(24px, 4vw) 100px; max-width: var(--max); margin: 0 auto; }
.cta-inner { padding: 60px 54px; text-align: center; display: flex; flex-direction: column; align-items: center; gap: 18px; background: radial-gradient(60% 120% at 50% 0%, rgba(45, 226, 255, .12), transparent 65%), linear-gradient(180deg, rgba(9, 15, 24, .9), rgba(5, 8, 13, .95)); position: relative; }
.cta-inner h2 { font-size: clamp(30px, 3.6vw, 52px); line-height: 1.1; }
.cta-inner p { color: var(--mute); font-size: 13.5px; max-width: 520px; }
.cta-accounts { margin-top: 14px; font-size: 9.5px; letter-spacing: .12em; color: var(--mute-2); }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--line); padding: 42px max(24px, 4vw) 30px; display: grid; grid-template-columns: 1fr 1.6fr; gap: 30px; max-width: var(--max); margin: 0 auto; }
.f-brand { display: flex; gap: 12px; align-items: flex-start; }
.f-brand .mark { width: 36px; height: 36px; display: grid; place-items: center; border: 1px solid var(--line-strong); color: var(--cyan); font-family: var(--font-display); font-weight: 700; }
.f-brand b { display: block; font-family: var(--font-display); letter-spacing: .26em; }
.f-brand span { display: block; font-size: 9px; color: var(--mute); letter-spacing: .12em; margin-top: 5px; }
.f-cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.f-cols em { display: block; font-style: normal; font-family: var(--font-mono); font-size: 8.5px; letter-spacing: .2em; color: var(--mute-2); margin-bottom: 10px; }
.f-cols a, .f-cols span { display: block; font-size: 11.5px; color: var(--mute); margin-bottom: 8px; }
.f-cols a:hover { color: var(--cyan); }
.f-bottom { grid-column: 1 / -1; font-size: 9px; letter-spacing: .14em; color: var(--mute-2); border-top: 1px solid var(--line); padding-top: 18px; }

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .hero { grid-template-columns: 1fr; padding-top: 120px; gap: 40px; }
  .hero-visual { max-width: 620px; }
  .section-head { grid-template-columns: 1fr; gap: 18px; }
  .demo { grid-template-columns: 1fr; }
  .demo-stage { min-height: 420px; }
  .mod-card.wide { grid-column: span 2; grid-row: auto; min-height: 320px; }
  .role-grid, .case-grid, .waste-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .nav { gap: 14px; }
  .nav .links, .nav-cta .btn.ghost { display: none; }
  .nav .logo .word i { display: none; }
  .nav .logo .word b { letter-spacing: 0.16em; }
  .nav-burger { display: block; }
  .hero { padding-top: 100px; }
  .hero h1 { font-size: 40px; }
  .hero-stats { flex-wrap: wrap; gap: 20px; }
  .section { padding: 70px 20px; }
  .waste-grid, .role-grid, .case-grid { grid-template-columns: 1fr; }
  .mod-card, .mod-card.wide, .mod-card.cta-mod { grid-column: span 3; }
  .compare-row { grid-template-columns: 70px 1fr 70px; gap: 10px; }
  .cta-inner { padding: 40px 24px; }
  .footer { grid-template-columns: 1fr; }
  .f-cols { grid-template-columns: 1fr 1fr; }
  .vf-hud.bottom { grid-template-columns: repeat(2, 1fr); gap: 10px; }
}