/* ============================================================
   battery-guide - shared design system
   ============================================================ */
:root {
  --bg:        #0f1613;
  --surface:   #151d19;
  --surface-2: #1c2620;
  --border:    #2a3630;
  --text:      #e9efeb;
  --text-dim:  #a4b3aa;
  --text-mute: #6f8078;
  --accent:    #34d399;   /* spring green */
  --accent-2:  #f5d97a;   /* champagne gold */
  --warn:      #f59e0b;
  --danger:    #ef4444;
  --gold:      #f5d97a;
  --radius:    14px;
  --radius-sm: 9px;
  --shadow:    0 8px 30px rgba(0,0,0,.35);
  --maxw:      1080px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: "SF Mono", "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
body.home::before,
body.bg-battery::before {
  content:""; position: fixed; inset: 0; z-index: -1;
  background:
    linear-gradient(rgba(15,22,19,.80), rgba(15,22,19,.90)),
    url('home-hero.webp') center top / cover no-repeat;
  pointer-events: none;
}
img { max-width: 100%; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- layout ---------- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }
.narrow { max-width: 780px; }
section { padding: 46px 0; }

/* ---------- top nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(15,20,23,.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; gap: 26px; height: 60px; line-height: 1; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: -.2px; color: var(--text); font-size: 2rem; }
.brand:hover { text-decoration: none; }
.brand .bolt { color: var(--accent); font-size: 1.25rem; }
.brand .logo { height: 36px; width: auto; display: block; flex: none; }
.brand .logo path { fill: url(#vrGrad); }
.wm-v { color: var(--accent); }
.wm-r { color: var(--gold); }
.nav-links { display: flex; align-items: center; gap: 20px; margin-left: auto; flex-wrap: wrap; }
.nav-links a { color: var(--text-dim); font-size: .93rem; font-weight: 500; }
.nav-links a:hover { color: var(--text); text-decoration: none; }
.nav-links a.cta {
  background: var(--accent); color: #06231a; padding: 7px 15px; border-radius: 999px; font-weight: 600;
}
.nav-links a.cta:hover { background: #5eead4; }

/* ---------- hero ---------- */
.hero { padding: 66px 0 40px; text-align: center; position: relative; overflow: hidden; }
.hero::before {
  content:""; position:absolute; inset:0;
  background: radial-gradient(600px 300px at 50% -10%, rgba(52,211,153,.15), transparent 70%);
  pointer-events:none;
}
.hero .wrap { position: relative; z-index: 1; }
.hero h1 { font-size: clamp(2.1rem, 5vw, 3.3rem); line-height: 1.08; margin: 0 0 16px; letter-spacing: -1px; }
.hero p.lead { font-size: 1.18rem; color: var(--text-dim); max-width: 620px; margin: 0 auto 28px; }
.hero .kicker { color: var(--accent); font-weight: 600; letter-spacing: 2px; text-transform: uppercase; font-size: .78rem; margin-bottom: 14px; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--accent); color: #06231a;
  padding: 12px 22px; border-radius: 999px; font-weight: 650; font-size: .98rem;
  border: none; cursor: pointer; transition: transform .12s ease, background .12s ease;
}
.btn:hover { background: #5eead4; text-decoration: none; transform: translateY(-1px); }
.btn.ghost { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn.ghost:hover { background: var(--surface-2); }
.btn-row { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ---------- cards / grid ---------- */
.grid { display: grid; gap: 18px; }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px; transition: border-color .15s ease, transform .15s ease;
}
.card.link:hover { border-color: var(--accent); transform: translateY(-2px); }
.card.link, .card.link:hover, .card.link:hover * { text-decoration: none; }
.card h3 { margin: 0 0 8px; font-size: 1.15rem; }
.card p { margin: 0; color: var(--text-dim); font-size: .95rem; }
.card .ico { font-size: 1.8rem; margin-bottom: 10px; display:block; }

/* ---------- section heads ---------- */
.eyebrow { color: var(--accent); font-weight: 600; letter-spacing: 1.5px; text-transform: uppercase; font-size: .76rem; }
h2.section-title { font-size: clamp(1.5rem, 3vw, 2rem); margin: 8px 0 6px; letter-spacing: -.5px; }
.section-sub { color: var(--text-dim); margin-top: 0; }

/* ---------- article ---------- */
.article-header { padding: 50px 0 24px; border-bottom: 1px solid var(--border); }
.article-header .tag { display:inline-block; background: var(--surface-2); border:1px solid var(--border); color: var(--text-dim); padding: 4px 12px; border-radius:999px; font-size:.78rem; font-weight:600; letter-spacing:.5px; margin-bottom:16px; }
.article-header h1 { font-size: clamp(1.9rem, 4.5vw, 2.9rem); margin: 0 0 14px; letter-spacing:-.7px; line-height:1.1; }
.article-header .lead { font-size: 1.15rem; color: var(--text-dim); max-width: 720px; }
.article-header .meta { color: var(--text-mute); font-size:.86rem; margin-top:18px; }

.article { font-size: 1.04rem; }
.article h2 { font-size: 1.6rem; margin: 44px 0 12px; letter-spacing:-.4px; scroll-margin-top: 80px; }
.article h3 { font-size: 1.22rem; margin: 30px 0 8px; }
.article p { color: #d5dde2; }
.article ul, .article ol { color: #d5dde2; padding-left: 20px; }
.article li { margin: 6px 0; }
.article strong { color: var(--text); }

/* TOC */
.toc { background: var(--surface); border:1px solid var(--border); border-radius: var(--radius); padding: 18px 22px; margin: 26px 0; }
.toc h4 { margin:0 0 10px; font-size:.8rem; letter-spacing:1.5px; text-transform:uppercase; color: var(--text-mute); }
.toc ol { margin:0; padding-left: 18px; columns: 2; column-gap: 30px; }
.toc a { color: var(--text-dim); font-size:.94rem; }
.toc a:hover { color: var(--accent); }

/* pick block */
.pick {
  background: var(--surface); border:1px solid var(--border); border-radius: var(--radius);
  padding: 24px; margin: 22px 0; position: relative;
}
.pick.best { border-color: var(--accent); box-shadow: 0 0 0 1px rgba(52,211,153,.25); }
.pick .award {
  position:absolute; top:-12px; left:22px;
  background: var(--accent); color:#06231a; font-weight:700; font-size:.74rem; letter-spacing:.5px;
  padding: 4px 12px; border-radius:999px; text-transform:uppercase;
}
.pick.best.gold .award { background: var(--gold); color:#3a2c00; }
.pick .pick-head { display:flex; justify-content:space-between; align-items:baseline; gap:14px; flex-wrap:wrap; margin-top:6px; }
.pick .pick-head h3 { margin:0; font-size:1.3rem; }
.pick .price { font-family: var(--mono); color: var(--accent); font-weight:600; white-space:nowrap; font-size:1.02rem; }
.pick .model { font-family: var(--mono); color: var(--text-mute); font-size:.84rem; }
.pros-cons { display:grid; grid-template-columns:1fr 1fr; gap:16px; margin-top:14px; }
.pros-cons ul { list-style:none; padding:0; margin:0; font-size:.93rem; }
.pros-cons li { padding-left:22px; position:relative; margin:5px 0; }
.pros li::before { content:"✓"; position:absolute; left:0; color:var(--accent); font-weight:700; }
.cons li::before { content:"✕"; position:absolute; left:0; color:var(--danger); font-weight:700; }
.pros-cons h5 { margin:0 0 6px; font-size:.76rem; letter-spacing:1px; text-transform:uppercase; color:var(--text-mute); }

/* tables */
.table-wrap { overflow-x:auto; margin: 22px 0; border:1px solid var(--border); border-radius: var(--radius); }
table { width:100%; border-collapse: collapse; font-size:.92rem; min-width: 520px; }
th, td { text-align:left; padding: 11px 14px; border-bottom:1px solid var(--border); }
th { background: var(--surface-2); color: var(--text-dim); font-weight:600; font-size:.8rem; letter-spacing:.4px; text-transform:uppercase; position:sticky; top:0; }
tr:last-child td { border-bottom:none; }
td.num, th.num { font-family: var(--mono); }
tbody tr:hover td { background: rgba(255,255,255,.02); }

/* callouts */
.callout { border-radius: var(--radius-sm); padding: 16px 18px; margin: 22px 0; border:1px solid var(--border); background: var(--surface-2); font-size:.96rem; }
.callout.tip { border: 2px dotted var(--accent); }
.callout.warn { border: 2px dotted var(--warn); }
.callout.danger { border: 2px dotted var(--danger); }
.callout strong { color: var(--text); }
.callout .lbl { font-weight:700; letter-spacing:.5px; text-transform:uppercase; font-size:.72rem; margin-right:6px; }
.callout.tip .lbl { color: var(--accent); }
.callout.warn .lbl { color: var(--warn); }
.callout.danger .lbl { color: var(--danger); }

/* app promo strip */
.appstrip { background: linear-gradient(120deg, var(--surface-2), var(--surface)); border:1px solid var(--border); border-radius: var(--radius); padding: 30px; text-align:center; margin: 30px 0; }
.appstrip h3 { margin:0 0 8px; font-size:1.4rem; }
.appstrip p { color: var(--text-dim); margin:0 0 18px; }

/* footer */
footer { border-top:1px solid var(--border); padding: 34px 0; color: var(--text-mute); font-size:1.5rem; }
footer .foot-grid { display:flex; justify-content:space-between; gap:20px; flex-wrap:wrap; align-items:center; }
footer a { color: var(--text-dim); }
.disclaimer { font-size:.82rem; color: var(--text-mute); margin-top:14px; line-height:1.55; }

/* misc */
.pill { display:inline-block; font-size:.72rem; font-weight:600; padding:3px 9px; border-radius:999px; letter-spacing:.4px; }
.pill.green { background: rgba(52,211,153,.15); color: var(--accent); }
.pill.blue  { background: rgba(245,217,122,.16); color: var(--accent-2); }
.pill.gold  { background: rgba(245,217,122,.16); color: var(--gold); }
.pill.red   { background: rgba(255,92,92,.14); color: var(--danger); }
.muted { color: var(--text-mute); }
.center { text-align:center; }
hr.rule { border:none; border-top:1px solid var(--border); margin: 40px 0; }

@media (max-width: 820px) {
  .grid.cols-3, .grid.cols-2 { grid-template-columns: 1fr; }
  .toc ol { columns: 1; }
  .pros-cons { grid-template-columns: 1fr; }
  .nav-links { gap: 14px; }
  .nav-links a:not(.cta) { display:none; }
}