/* ============================================================
   NekoCenter 官网 · 设计系统
   深色高端 / 编辑式排版 / 无 emoji / 无 AI 模板味
   ============================================================ */

:root {
  --ink:        #0c0c0f;   /* 近黑底色 */
  --ink-2:      #121217;   /* 面板 */
  --ink-3:      #17171d;   /* 抬升面板 */
  --line:       rgba(255,255,255,.09);
  --line-strong:rgba(255,255,255,.16);
  --text:       #f1efe9;   /* 暖白 */
  --text-2:     #b7b4ab;   /* 次级 */
  --text-3:     #807d75;   /* 弱化 */
  --amber:      #e8772e;   /* 品牌琥珀 */
  --amber-soft: #f6944b;
  --amber-dim:  rgba(232,119,46,.14);
  --ok:         #5fb98a;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --serif: "Songti SC", "STSong", "Source Han Serif SC", "Noto Serif SC", Georgia, serif;
  --maxw: 1180px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--sans);
  background: var(--ink);
  color: var(--text);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
/* 细微噪点纹理，去掉 AI 那种“过分干净”的塑料感 */
body::before {
  content: "";
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  opacity: .035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
/* 极淡的暖色光晕，非糖果渐变 */
body::after {
  content: "";
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(900px 520px at 82% -8%, rgba(232,119,46,.10), transparent 60%),
    radial-gradient(700px 500px at -5% 100%, rgba(91,141,239,.06), transparent 55%);
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

.wrap { position: relative; z-index: 1; max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }
.eyebrow {
  font-family: var(--mono); font-size: 12px; letter-spacing: .22em;
  text-transform: uppercase; color: var(--amber); margin-bottom: 18px;
}
.lede { color: var(--text-2); font-size: 18px; max-width: 60ch; }

/* ---------- 顶部导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(12,12,15,.72);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 14px 28px;
  display: flex; align-items: center; gap: 28px;
}
.brand { display: flex; align-items: center; gap: 11px; font-weight: 700; letter-spacing: .01em; }
.brand svg { width: 30px; height: 30px; color: var(--amber); }
.brand .name { font-size: 17px; }
.brand .name b { font-weight: 800; }
.brand .name span { color: var(--text-3); font-weight: 500; font-family: var(--mono); font-size: 12px; margin-left: 6px; }
.nav-links { margin-left: auto; display: flex; gap: 26px; align-items: center; }
.nav-links a { color: var(--text-2); font-size: 14.5px; transition: color .18s; }
.nav-links a:hover { color: var(--text); }
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  font-size: 14.5px; font-weight: 600; padding: 11px 20px; border-radius: 10px;
  border: 1px solid transparent; cursor: pointer; transition: transform .12s, background .2s, border-color .2s;
}
.btn-primary { background: var(--amber); color: #1a0f06; }
.btn-primary:hover { background: var(--amber-soft); }
.btn-primary:active { transform: translateY(1px); }
.btn-ghost { border-color: var(--line-strong); color: var(--text); background: transparent; }
.btn-ghost:hover { border-color: var(--amber); color: var(--amber-soft); }
.nav .btn { padding: 9px 17px; }

/* ---------- Hero ---------- */
.hero { padding: 86px 0 70px; }
.hero-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 56px; align-items: center; }
.hero h1 {
  font-family: var(--serif); font-weight: 700;
  font-size: clamp(40px, 6vw, 68px); line-height: 1.04; letter-spacing: -.01em;
  margin: 0 0 22px;
}
.hero h1 .accent { color: var(--amber); }
.hero p.tag { font-size: 19px; color: var(--text-2); max-width: 46ch; margin-bottom: 14px; }
.hero .meta-row {
  font-family: var(--mono); font-size: 12.5px; color: var(--text-3);
  letter-spacing: .04em; margin-bottom: 34px; display: flex; flex-wrap: wrap; gap: 8px 18px;
}
.hero .meta-row span::before { content: "·"; margin-right: 18px; color: var(--line-strong); }
.hero .meta-row span:first-child::before { content: ""; margin: 0; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------- 手机样机（展示 App 玻璃界面） ---------- */
.device {
  width: 268px; height: 548px; margin: 0 auto;
  border-radius: 40px; padding: 12px;
  background: linear-gradient(160deg, #1b1b22, #0a0a0d);
  border: 1px solid rgba(255,255,255,.14);
  box-shadow: 0 40px 90px -30px rgba(0,0,0,.85), inset 0 0 0 2px rgba(255,255,255,.03);
  position: relative;
}
.device::before { /* 听筒 */
  content: ""; position: absolute; top: 22px; left: 50%; transform: translateX(-50%);
  width: 46px; height: 5px; border-radius: 4px; background: rgba(255,255,255,.16);
}
.device .screen {
  width: 100%; height: 100%; border-radius: 30px; overflow: hidden;
  position: relative;
  background:
    radial-gradient(420px 300px at 70% -10%, rgba(232,119,46,.22), transparent 60%),
    linear-gradient(180deg, #15151c, #0c0c11);
}
.screen .s-status { display: flex; justify-content: space-between; padding: 16px 18px 8px; font-family: var(--mono); font-size: 10px; color: var(--text-2); }
.screen .s-title { font-family: var(--serif); font-size: 22px; padding: 6px 18px 14px; }
.screen .glass {
  margin: 0 14px 12px; padding: 14px; border-radius: 18px;
  background: rgba(255,255,255,.07); border: 1px solid rgba(255,255,255,.12);
  backdrop-filter: blur(10px);
}
.screen .glass .g-label { font-family: var(--mono); font-size: 9px; color: var(--text-3); letter-spacing: .1em; }
.screen .bars { display: flex; align-items: flex-end; gap: 6px; height: 56px; margin-top: 10px; }
.screen .bars i { flex: 1; background: linear-gradient(180deg, var(--amber), rgba(232,119,46,.25)); border-radius: 4px 4px 0 0; display: block; }
.screen .row2 { margin: 0 14px 10px; display: flex; gap: 10px; }
.screen .row2 .pill { flex: 1; padding: 10px; border-radius: 14px; background: rgba(255,255,255,.05); border: 1px solid var(--line); }
.screen .row2 .pill b { font-family: var(--mono); font-size: 15px; display: block; }
.screen .row2 .pill span { font-size: 9px; color: var(--text-3); }
.screen .s-nav { position: absolute; bottom: 14px; left: 14px; right: 14px; height: 50px; border-radius: 16px;
  background: rgba(255,255,255,.06); border: 1px solid var(--line); display: flex; align-items: center; justify-content: space-around; }
.screen .s-nav i { width: 22px; height: 22px; border-radius: 7px; border: 1.5px solid var(--text-3); }
.screen .s-nav i.on { border-color: var(--amber); background: var(--amber-dim); }

/* ---------- 区块通用 ---------- */
section.block { padding: 78px 0; border-top: 1px solid var(--line); position: relative; z-index: 1; }
.section-head { max-width: 760px; margin-bottom: 46px; }
.section-head h2 { font-family: var(--serif); font-size: clamp(28px, 4vw, 40px); line-height: 1.12; letter-spacing: -.01em; }
.section-head p { margin-top: 14px; color: var(--text-2); font-size: 17px; max-width: 56ch; }

/* 产品陈述（编辑式大字） */
.statement { font-family: var(--serif); font-size: clamp(22px, 3.1vw, 32px); line-height: 1.5; max-width: 24ch; }
.statement .hl { color: var(--amber); }
.statement-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.statement-grid .aside { color: var(--text-2); font-size: 16px; }
.statement-grid .aside p + p { margin-top: 16px; }

/* ---------- 功能（编号编辑式） ---------- */
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 16px; overflow: hidden; }
.feat { background: var(--ink); padding: 30px 26px 34px; transition: background .25s; }
.feat:hover { background: var(--ink-2); }
.feat .no { font-family: var(--mono); font-size: 12px; color: var(--amber); letter-spacing: .12em; }
.feat .ic { width: 34px; height: 34px; color: var(--text); margin: 16px 0 14px; }
.feat h3 { font-size: 19px; margin-bottom: 10px; }
.feat p { color: var(--text-2); font-size: 14.5px; line-height: 1.7; }

/* ---------- 统一账号 ---------- */
.account-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 54px; align-items: center; }
.account-copy h3 { font-family: var(--serif); font-size: 24px; margin-bottom: 14px; }
.account-copy p { color: var(--text-2); margin-bottom: 16px; }
.spec-list { font-family: var(--mono); font-size: 13px; }
.spec-list .sl { display: flex; justify-content: space-between; gap: 16px; padding: 11px 0; border-top: 1px solid var(--line); }
.spec-list .sl:first-child { border-top: 0; }
.spec-list .k { color: var(--text-3); }
.spec-list .v { color: var(--text); text-align: right; }
/* OAuth 流程小图 */
.flow { background: var(--ink-2); border: 1px solid var(--line); border-radius: 16px; padding: 26px; }
.flow .step { display: flex; align-items: center; gap: 14px; padding: 14px 0; }
.flow .step + .step { border-top: 1px dashed var(--line); }
.flow .dot { width: 30px; height: 30px; flex: none; border-radius: 50%; background: var(--amber-dim); border: 1px solid var(--amber); color: var(--amber); font-family: var(--mono); font-size: 13px; display: flex; align-items: center; justify-content: center; }
.flow .step .t { font-size: 14.5px; }
.flow .step .t small { display: block; color: var(--text-3); font-family: var(--mono); font-size: 11px; margin-top: 2px; }

/* ---------- 猫猫加固 ---------- */
.secure-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; margin-top: 8px; }
.secure-card { background: var(--ink-2); border: 1px solid var(--line); border-radius: 14px; padding: 24px; }
.secure-card h4 { font-size: 17px; margin-bottom: 8px; display: flex; align-items: center; gap: 10px; }
.secure-card h4::before { content: ""; width: 8px; height: 8px; border-radius: 2px; background: var(--amber); }
.secure-card p { color: var(--text-2); font-size: 14.5px; }
.badge-neko { display: inline-flex; align-items: center; gap: 8px; font-family: var(--mono); font-size: 12px; color: var(--amber); border: 1px solid var(--amber); border-radius: 999px; padding: 5px 13px; margin-top: 4px; }
.badge-neko b { color: var(--text); font-weight: 700; }

/* ---------- 关于 ---------- */
.about-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 54px; align-items: start; }
.about-portrait { aspect-ratio: 1/1; border-radius: 20px; border: 1px solid var(--line); background:
  radial-gradient(120% 120% at 30% 20%, rgba(232,119,46,.25), transparent 55%), var(--ink-2);
  display: flex; align-items: center; justify-content: center; }
.about-portrait svg { width: 96px; height: 96px; color: var(--amber); }
.about-copy h3 { font-family: var(--serif); font-size: 26px; margin-bottom: 6px; }
.about-copy .role { font-family: var(--mono); font-size: 12.5px; color: var(--text-3); margin-bottom: 20px; }
.about-copy p { color: var(--text-2); margin-bottom: 14px; }
.about-copy .links { display: flex; gap: 18px; margin-top: 22px; flex-wrap: wrap; }
.about-copy .links a { color: var(--amber-soft); font-size: 14px; border-bottom: 1px solid transparent; }
.about-copy .links a:hover { border-color: var(--amber-soft); }

/* ---------- 页脚 ---------- */
footer { border-top: 1px solid var(--line); padding: 54px 0 40px; position: relative; z-index: 1; }
.foot-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 30px; }
.foot-grid h5 { font-size: 13px; color: var(--text-3); font-family: var(--mono); letter-spacing: .1em; text-transform: uppercase; margin-bottom: 16px; }
.foot-grid a { display: block; color: var(--text-2); font-size: 14px; padding: 5px 0; }
.foot-grid a:hover { color: var(--text); }
.foot-brand p { color: var(--text-3); font-size: 13.5px; margin-top: 14px; max-width: 34ch; }
.foot-bottom { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; margin-top: 44px; padding-top: 22px; border-top: 1px solid var(--line); color: var(--text-3); font-size: 12.5px; font-family: var(--mono); }

/* =========================================================
   下载页
   ========================================================= */
.dl { min-height: 100vh; position: relative; z-index: 1; }
.dl-wrap { display: grid; grid-template-columns: minmax(360px, 40%) 1fr; }

/* —— 桌面横屏：左品牌栏（固定），右信息栏（滚动） —— */
.dl-brand {
  position: sticky; top: 0; align-self: start; height: 100vh;
  padding: 56px 44px; display: flex; flex-direction: column; justify-content: space-between;
  border-right: 1px solid var(--line);
  background:
    radial-gradient(600px 400px at 20% 0%, rgba(232,119,46,.12), transparent 60%),
    linear-gradient(180deg, var(--ink-2), var(--ink));
}
.dl-brand .top { display: flex; align-items: center; gap: 12px; }
.dl-brand .top svg { width: 38px; height: 38px; color: var(--amber); }
.dl-brand .top .t-name { font-size: 20px; font-weight: 800; }
.dl-brand .top .t-name small { display: block; font-family: var(--mono); font-size: 11px; color: var(--text-3); font-weight: 400; }
.dl-brand .hero-device { margin: 8px auto; transform: scale(.92); }
.dl-brand .qr {
  align-self: flex-start; background: #f4f1ea; border-radius: 14px; padding: 14px;
  display: flex; align-items: center; gap: 14px; color: #1a1712;
}
.dl-brand .qr img { width: 116px; height: 116px; }
.dl-brand .qr .qt { font-size: 13px; line-height: 1.5; max-width: 150px; }
.dl-brand .qr .qt b { display: block; font-size: 14px; margin-bottom: 3px; }
.dl-brand .foot-note { font-family: var(--mono); font-size: 11.5px; color: var(--text-3); line-height: 1.7; }

.dl-info { padding: 56px 56px 80px; }
.dl-info .crumb { font-family: var(--mono); font-size: 12px; color: var(--text-3); letter-spacing: .08em; margin-bottom: 22px; }
.dl-info h1 { font-family: var(--serif); font-size: clamp(32px, 4.4vw, 48px); line-height: 1.08; margin-bottom: 12px; }
.dl-info .sub { color: var(--text-2); font-size: 17px; margin-bottom: 30px; max-width: 52ch; }

.dl-cta { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 38px; }
.dl-cta .btn { padding: 15px 26px; font-size: 16px; }
.dl-cta .size { font-family: var(--mono); font-size: 12.5px; color: var(--text-3); align-self: center; }

.dl-section { border-top: 1px solid var(--line); padding: 30px 0; }
.dl-section h3 { font-family: var(--mono); font-size: 13px; letter-spacing: .14em; text-transform: uppercase; color: var(--text-3); margin-bottom: 18px; }

/* 规格表（等宽，工程感） */
.dl-spec { display: grid; grid-template-columns: 1fr 1fr; gap: 0 40px; }
.dl-spec .row { display: flex; justify-content: space-between; gap: 14px; padding: 12px 0; border-bottom: 1px solid var(--line); font-family: var(--mono); font-size: 13.5px; }
.dl-spec .row .k { color: var(--text-3); flex: none; }
.dl-spec .row .v { color: var(--text); text-align: right; flex: 1; min-width: 0; word-break: break-word; }

/* 更新日志 */
.changelog .cl { display: grid; grid-template-columns: 92px 1fr; gap: 18px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.changelog .cl:last-child { border-bottom: 0; }
.changelog .ver { font-family: var(--mono); font-size: 13px; color: var(--amber); }
.changelog .cl .body { font-size: 14.5px; color: var(--text-2); }
.changelog .cl .body b { color: var(--text); font-weight: 600; }

/* 安装步骤 */
.steps { counter-reset: s; }
.steps .step { display: grid; grid-template-columns: 38px 1fr; gap: 16px; padding: 14px 0; }
.steps .step .n { counter-increment: s; width: 32px; height: 32px; border-radius: 50%; border: 1px solid var(--amber); color: var(--amber); font-family: var(--mono); font-size: 14px; display: flex; align-items: center; justify-content: center; }
.steps .step .n::before { content: counter(s); }
.steps .step .txt { font-size: 14.5px; color: var(--text-2); }
.steps .step .txt b { color: var(--text); }

/* 安全提示条 */
.dl-note { background: var(--ink-2); border: 1px solid var(--line); border-left: 3px solid var(--amber); border-radius: 12px; padding: 18px 20px; font-size: 14px; color: var(--text-2); }
.dl-note b { color: var(--text); }
.dl-note .sig { font-family: var(--mono); font-size: 12px; color: var(--text-3); margin-top: 8px; word-break: break-all; }

/* —— 手机版下载页（重构：编辑式竖排，非 AI 模板） —— */
.dl-mobile-only { display: none; }

@media (max-width: 980px) {
  .dl { display: none; }                   /* 整块隐藏桌面横屏版 */
  /* 手机：独立版式 */
  .dl-mobile-only { display: block; }
  .m-head {
    position: sticky; top: 0; z-index: 20;
    background: rgba(12,12,15,.82); backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--line);
    padding: 13px 20px; display: flex; align-items: center; justify-content: space-between;
  }
  .m-head .m-brand { display: flex; align-items: center; gap: 10px; font-weight: 800; }
  .m-head .m-brand svg { width: 28px; height: 28px; color: var(--amber); }
  .m-hero { padding: 40px 22px 26px; border-bottom: 1px solid var(--line); }
  .m-hero .m-device { margin: 0 auto 26px; transform: scale(.86); }
  .m-hero h1 { font-family: var(--serif); font-size: 34px; line-height: 1.1; margin-bottom: 10px; }
  .m-hero .m-sub { color: var(--text-2); font-size: 15.5px; margin-bottom: 24px; max-width: 40ch; }
  .m-hero .m-btn { display: block; width: 100%; text-align: center; padding: 17px; font-size: 17px; font-weight: 700; border-radius: 13px; background: var(--amber); color: #1a0f06; }
  .m-hero .m-size { text-align: center; font-family: var(--mono); font-size: 12px; color: var(--text-3); margin-top: 12px; }

  .m-body { padding: 8px 22px 40px; }
  .m-block { padding: 26px 0; border-bottom: 1px solid var(--line); }
  .m-block:last-child { border-bottom: 0; }
  .m-block h3 { font-family: var(--mono); font-size: 12px; letter-spacing: .14em; text-transform: uppercase; color: var(--text-3); margin-bottom: 16px; }
  .m-spec .row { display: flex; justify-content: space-between; gap: 14px; padding: 11px 0; border-bottom: 1px solid var(--line); font-family: var(--mono); font-size: 13px; }
  .m-spec .row:last-child { border-bottom: 0; }
  .m-spec .k { color: var(--text-3); flex: none; }
  .m-spec .v { color: var(--text); text-align: right; flex: 1; min-width: 0; word-break: break-word; }
  .m-steps .st { display: grid; grid-template-columns: 30px 1fr; gap: 13px; padding: 12px 0; font-size: 14.5px; color: var(--text-2); }
  .m-steps .st .n { width: 26px; height: 26px; border-radius: 50%; border: 1px solid var(--amber); color: var(--amber); font-family: var(--mono); font-size: 12px; display: flex; align-items: center; justify-content: center; }
  .m-steps .st b { color: var(--text); }
  .m-note { background: var(--ink-2); border: 1px solid var(--line); border-left: 3px solid var(--amber); border-radius: 11px; padding: 16px 17px; font-size: 13.5px; color: var(--text-2); }
  .m-note b { color: var(--text); }
  .m-note .sig { font-family: var(--mono); font-size: 11px; color: var(--text-3); margin-top: 8px; word-break: break-all; }
  .m-foot { padding: 26px 22px 40px; text-align: center; color: var(--text-3); font-family: var(--mono); font-size: 11.5px; line-height: 1.8; }
}

/* ---------- 通用响应式 ---------- */
@media (max-width: 860px) {
  .nav-links { display: none; }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero { padding: 54px 0 46px; }
  .statement-grid, .account-grid, .about-grid { grid-template-columns: 1fr; gap: 30px; }
  .features { grid-template-columns: 1fr; }
  .secure-grid { grid-template-columns: 1fr; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
  .wrap { padding: 0 20px; }
}
@media (max-width: 520px) {
  .foot-grid { grid-template-columns: 1fr; }
  .dl-spec { grid-template-columns: 1fr; }
}