/* ==========================================================
   BIP39 Generator — style.css
   移动优先 · 自适应 · 简洁深色
   ========================================================== */

:root{
  --bg:            #08090a;
  --panel:         #0e1013;
  --panel-2:       #13161a;
  --border:        rgba(255,255,255,0.07);
  --border-strong: rgba(255,255,255,0.13);
  --fg:            #eceef1;
  --fg-dim:        #b4b9c0;
  --muted:         #8b939c;
  --accent:        #7dd3fc;
  --danger:        #f87171;
  --success:       #4ade80;
  --radius:        12px;
  --radius-sm:     8px;
  --mono:          ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
  --sans:          system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif;
}

/* ---------- 基础 ---------- */
*,
*::before,
*::after{box-sizing:border-box}

html{
  -webkit-text-size-adjust:100%;
  text-size-adjust:100%;
}

body{
  margin:0;
  min-height:100vh;
  position:relative;
  font-family:var(--sans);
  font-size:1rem;               /* 16px 基准，iOS 输入框不缩放 */
  background:var(--bg);
  color:var(--fg);
  line-height:1.65;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  text-rendering:optimizeLegibility;
}

/* 顶部极淡天青，避免纯黑死板 */
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background:radial-gradient(
    ellipse 80% 50% at 50% -12%,
    rgba(125,211,252,0.07),
    transparent 65%
  );
}

::selection{background:rgba(125,211,252,0.25);color:var(--fg)}

::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:var(--bg)}
::-webkit-scrollbar-thumb{background:#1f2429;border-radius:10px;border:2px solid var(--bg)}
::-webkit-scrollbar-thumb:hover{background:#2a3036}

/* ---------- 布局 ---------- */
.container{
  position:relative;
  z-index:1;
  width:100%;
  max-width:880px;
  margin:0 auto;
  padding:20px 16px 40px;
}

/* ---------- 顶栏 ---------- */
.topbar{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:12px;
  margin-bottom:32px;
  flex-wrap:wrap;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--mono);
  font-size:0.68rem;
  letter-spacing:0.1em;
  color:var(--muted);
  text-transform:uppercase;
  white-space:nowrap;
}

.brand .dot{
  width:5px;
  height:5px;
  border-radius:50%;
  background:var(--accent);
  box-shadow:0 0 10px rgba(125,211,252,0.7);
  animation:pulse 2.4s ease-in-out infinite;
  flex-shrink:0;
}

@keyframes pulse{
  0%,100%{opacity:1;transform:scale(1)}
  50%{opacity:.4;transform:scale(.75)}
}

/* ---------- 语言选择 ---------- */
.lang-switch{
  display:flex;
  align-items:center;
}

.lang-switch select{
  appearance:none;
  -webkit-appearance:none;
  min-height:40px;
  padding:7px 30px 7px 12px;
  font-size:0.8125rem;
  font-family:inherit;
  color:var(--fg-dim);
  background-color:var(--panel);
  border:1px solid var(--border-strong);
  border-radius:var(--radius-sm);
  background-image:
    linear-gradient(45deg,transparent 50%,var(--muted) 50%),
    linear-gradient(135deg,var(--muted) 50%,transparent 50%);
  background-position:calc(100% - 15px) 50%,calc(100% - 10px) 50%;
  background-size:4px 4px,4px 4px;
  background-repeat:no-repeat;
  cursor:pointer;
  transition:border-color .15s ease,color .15s ease;
}

.lang-switch select:hover{
  color:var(--fg);
  border-color:rgba(255,255,255,0.22);
}

.lang-switch select:focus{
  outline:none;
  border-color:var(--accent);
  box-shadow:0 0 0 3px rgba(125,211,252,0.1);
}

.lang-switch select option{
  background:var(--panel-2);
  color:var(--fg);
}

/* ---------- Hero ---------- */
.hero{margin-bottom:28px}

h1{
  font-size:clamp(1.5rem,5.5vw,2.25rem);
  font-weight:600;
  letter-spacing:-0.025em;
  line-height:1.2;
  margin:0 0 12px;
  color:var(--fg);
}

.sub{
  color:var(--muted);
  font-size:0.9rem;
  line-height:1.75;
  margin:0;
  max-width:640px;
}

/* ---------- 卡片 ---------- */
.card{
  position:relative;
  background:var(--panel);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:18px;
  margin-bottom:14px;
  box-shadow:inset 0 1px 0 rgba(255,255,255,0.03);
}

.card h2{
  font-size:0.78rem;
  font-weight:500;
  letter-spacing:0.02em;
  color:var(--muted);
  margin:0 0 14px;
}

/* ---------- 表单 ---------- */
label{
  display:block;
  font-size:0.78rem;
  font-weight:500;
  color:var(--muted);
  margin:0 0 7px;
  letter-spacing:0.01em;
}

textarea,
input[type=text],
select{
  width:100%;
  min-height:44px;              /* 触摸目标 ≥44px */
  padding:11px 13px;
  font-size:1rem;               /* 基础 16px，iOS 不缩放 */
  font-family:inherit;
  color:var(--fg);
  background:var(--bg);
  border:1px solid var(--border-strong);
  border-radius:var(--radius-sm);
  transition:border-color .15s ease,box-shadow .15s ease;
}

textarea{
  min-height:96px;
  resize:vertical;
  font-family:var(--mono);
  font-size:0.9375rem;
  line-height:1.7;
}

textarea::placeholder,
input::placeholder{color:#4b5158}

textarea:focus,
input:focus,
select:focus{
  outline:none;
  border-color:var(--accent);
  box-shadow:0 0 0 3px rgba(125,211,252,0.1);
}

/* 防止 iOS 对 select 的默认样式覆盖 */
select{appearance:none;-webkit-appearance:none}

/* ---------- 按钮行 ---------- */
.row{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
  align-items:center;
  margin-top:12px;
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:44px;              /* 触摸目标 ≥44px */
  padding:10px 18px;
  font-size:0.875rem;
  font-weight:500;
  letter-spacing:0.01em;
  border-radius:var(--radius-sm);
  border:1px solid transparent;
  cursor:pointer;
  white-space:nowrap;
  color:#0a0b0d;
  background:#eceef1;
  border-color:#eceef1;
  flex:1 1 auto;                /* 移动端按钮撑满行宽 */
  transition:background .15s ease,border-color .15s ease,color .15s ease,opacity .15s ease;
}

.btn:hover{
  background:#fff;
  border-color:#fff;
}

.btn:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:2px;
}

.btn:disabled{
  opacity:0.5;
  cursor:not-allowed;
}

.btn.outline{
  background:transparent;
  color:var(--fg-dim);
  border-color:var(--border-strong);
}

.btn.outline:hover{
  background:rgba(255,255,255,0.04);
  color:var(--fg);
  border-color:rgba(255,255,255,0.22);
}

/* ---------- 提示条 ---------- */
.alert{
  padding:11px 14px;
  border-radius:var(--radius-sm);
  font-size:0.83rem;
  line-height:1.6;
  margin-bottom:16px;
}

.alert.err{
  color:#fca5a5;
  background:rgba(248,113,113,0.07);
  border:1px solid rgba(248,113,113,0.22);
}

/* ---------- 文本工具 ---------- */
.mono{
  font-family:var(--mono);
  font-size:0.8125rem;
  word-break:break-all;
}

.muted{
  color:var(--muted);
  font-size:0.83rem;
  line-height:1.7;
}

.err-text{color:var(--danger)}
.ok-text{color:var(--success)}

/* ---------- 动态区域占位：减少 CLS ---------- */
#entropyView,
#checksumView{
  min-height:44px;
}

/* ---------- 熵输出块 ---------- */
.output-box{
  font-family:var(--mono);
  font-size:0.78rem;
  word-break:break-all;
  line-height:1.6;
  padding:12px 14px;
  border-radius:var(--radius-sm);
  background:var(--bg);
  border:1px solid var(--border);
  color:var(--accent);
}

/* ---------- 词块网格 ---------- */
.word-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(96px,1fr));
  gap:7px;
  margin-top:14px;
}

.word-grid:empty{display:none}

.word-chip{
  display:flex;
  align-items:center;
  gap:7px;
  padding:9px 11px;
  border-radius:var(--radius-sm);
  background:var(--panel-2);
  border:1px solid var(--border);
  font-family:var(--mono);
  font-size:0.78rem;
  color:var(--fg);
  animation:fadeIn .25s ease both;
  transition:border-color .15s ease,background .15s ease;
  overflow-wrap:anywhere;
}

.word-chip:hover{
  border-color:var(--border-strong);
  background:#161a1e;
}

.word-chip .idx{
  color:var(--muted);
  font-size:0.68rem;
  min-width:16px;
  flex-shrink:0;
}

@keyframes fadeIn{
  from{opacity:0;transform:translateY(4px)}
  to{opacity:1;transform:none}
}

/* ---------- 表格：窄屏可横向滚动 ---------- */
#checksumView{
  overflow-x:auto;
  -webkit-overflow-scrolling:touch;
}

table{
  width:100%;
  border-collapse:collapse;
  font-size:0.8125rem;
  margin-top:12px;
}

th,
td{
  border:1px solid var(--border);
  padding:8px 10px;
  text-align:left;
  vertical-align:top;
}

th{
  background:var(--bg);
  color:var(--muted);
  font-weight:500;
  font-size:0.68rem;
  text-transform:uppercase;
  letter-spacing:0.06em;
  white-space:nowrap;
}

td{color:var(--fg-dim)}

tbody tr:nth-child(even){background:rgba(255,255,255,0.012)}

/* ---------- SEO 内容区 ---------- */
.seo-section{
  position:relative;
  z-index:1;
  width:100%;
  max-width:880px;
  margin:0 auto;
  padding:0 16px 24px;
}

.seo-card{
  background:var(--panel);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:22px 18px;
}

.seo-card h2{
  font-size:0.9375rem;
  font-weight:600;
  letter-spacing:-0.005em;
  color:var(--fg);
  margin:0 0 8px;
  line-height:1.4;
}

.seo-card h2:not(:first-child){margin-top:26px}

.seo-card p,
.seo-card li{
  color:var(--muted);
  font-size:0.875rem;
  line-height:1.8;
  margin:0;
}

.seo-card ul{
  margin:0 0 8px;
  padding-left:20px;
}

.seo-card strong{
  color:var(--fg-dim);
  font-weight:600;
}

/* ---------- 页脚 ---------- */
footer{
  position:relative;
  z-index:1;
  max-width:880px;
  margin:0 auto;
  padding:20px 16px 48px;
  text-align:center;
  color:var(--muted);
  font-size:0.75rem;
  font-family:var(--mono);
  letter-spacing:0.03em;
  line-height:1.8;
}

/* ==========================================================
   断点：≥640px（平板 / 桌面）
   ========================================================== */
@media (min-width:640px){
  .container{
    padding:28px 20px 48px;
  }

  .topbar{
    gap:16px;
    margin-bottom:44px;
  }

  .brand{
    font-size:0.7rem;
  }

  .hero{margin-bottom:36px}

  .sub{font-size:0.9375rem}

  .card{
    padding:24px;
    margin-bottom:16px;
  }

  .card h2{
    font-size:0.8125rem;
    margin-bottom:18px;
  }

  /* 输入框恢复常规字号 */
  textarea,
  input[type=text],
  select{
    font-size:0.9375rem;
  }

  textarea{font-size:0.85rem}

  /* 按钮不再强制撑满，按内容宽度 */
  .btn{flex:0 0 auto}

  .word-grid{
    grid-template-columns:repeat(auto-fill,minmax(112px,1fr));
    gap:8px;
  }

  .word-chip{font-size:0.8rem}

  .seo-section{padding:0 20px 24px}

  .seo-card{padding:28px 24px}

  footer{
    padding:20px 20px 56px;
  }
}

/* ==========================================================
   断点：≥900px（宽屏）
   ========================================================== */
@media (min-width:900px){
  .container{
    padding:36px 24px 56px;
  }

  .seo-section{padding:0 24px 28px}

  footer{padding:20px 24px 64px}
}

/* ==========================================================
   断点：≤400px（超小屏）
   ========================================================== */
@media (max-width:400px){
  .container{padding:16px 14px 32px}

  .hero{margin-bottom:24px}

  .card{padding:16px}

  /* 按钮整行堆叠，避免过窄 */
  .row{gap:8px}
  .btn{flex:1 1 100%}

  /* 强度下拉独占一行 */
  #strength{
    width:100% !important;
  }

  .word-grid{
    grid-template-columns:repeat(auto-fill,minmax(84px,1fr));
  }

  .seo-section{padding:0 14px 20px}
  .seo-card{padding:18px 14px}
}

/* ==========================================================
   无障碍：减少动态效果
   ========================================================== */
@media (prefers-reduced-motion:reduce){
  *,
  *::before,
  *::after{
    animation-duration:0.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:0.01ms !important;
    scroll-behavior:auto !important;
  }
}

/* ==========================================================
   打印样式
   ========================================================== */
@media print{
  body{background:#fff;color:#000}
  body::before{display:none}
  .topbar,
  .lang-switch,
  .row,
  footer{display:none}
  .card,
  .seo-card{
    background:#fff;
    border:1px solid #ccc;
    box-shadow:none;
  }
  .output-box{
    background:#f5f5f5;
    color:#000;
    border-color:#ccc;
  }
}