/* ═══════════════════════════════════════════════
   Agilent 8900 ICP-MS Operation Guide
   Design System — Matching Lab Notes Aesthetic
   ═══════════════════════════════════════════════ */

/* ── Theme Variables ── */
[data-theme="dark"]{
  --bg:#040d1a;--bg2:#071528;
  --glass:rgba(255,255,255,0.04);--glass-border:rgba(255,255,255,0.09);
  --cyan:#00e5ff;--cyan-dim:rgba(0,229,255,0.12);
  --mint:#00ffb3;--mint-dim:rgba(0,255,179,0.12);
  --amber:#ffb700;--amber-dim:rgba(255,183,0,0.13);
  --purple:#b47aff;--purple-dim:rgba(180,122,255,0.12);
  --red:#ff4d6d;--red-dim:rgba(255,77,109,0.13);
  --text:#c8d8f0;--text-dim:#6888aa;--text-bright:#eaf4ff;
  --card-bg:rgba(255,255,255,0.04);--card-border:rgba(255,255,255,0.09);
  --card-hover:rgba(255,255,255,0.07);--orb-opacity:0.16;
  --code-bg:rgba(0,229,255,0.06);--code-border:rgba(0,229,255,0.15);
  --table-header:rgba(0,229,255,0.08);--table-row-alt:rgba(255,255,255,0.02);
  --table-border:rgba(255,255,255,0.08);
  --tip-bg:rgba(0,255,179,0.06);--tip-border:rgba(0,255,179,0.25);
  --warn-bg:rgba(255,183,0,0.06);--warn-border:rgba(255,183,0,0.25);
  --danger-bg:rgba(255,77,109,0.06);--danger-border:rgba(255,77,109,0.25);
  --note-bg:rgba(180,122,255,0.06);--note-border:rgba(180,122,255,0.25);
}
[data-theme="light"]{
  --bg:#f0f4fa;--bg2:#e4edf8;
  --glass:rgba(255,255,255,0.7);--glass-border:rgba(80,120,200,0.15);
  --cyan:#0080aa;--cyan-dim:rgba(0,128,170,0.1);
  --mint:#007a55;--mint-dim:rgba(0,122,85,0.1);
  --amber:#b07800;--amber-dim:rgba(176,120,0,0.1);
  --purple:#7040b0;--purple-dim:rgba(112,64,176,0.1);
  --red:#c0203a;--red-dim:rgba(192,32,58,0.1);
  --text:#1a2a44;--text-dim:#5a7090;--text-bright:#0a1830;
  --card-bg:rgba(255,255,255,0.82);--card-border:rgba(80,130,200,0.18);
  --card-hover:rgba(255,255,255,0.95);--orb-opacity:0.10;
  --code-bg:rgba(0,128,170,0.06);--code-border:rgba(0,128,170,0.15);
  --table-header:rgba(0,128,170,0.08);--table-row-alt:rgba(0,0,0,0.02);
  --table-border:rgba(0,0,0,0.08);
  --tip-bg:rgba(0,122,85,0.06);--tip-border:rgba(0,122,85,0.25);
  --warn-bg:rgba(176,120,0,0.06);--warn-border:rgba(176,120,0,0.25);
  --danger-bg:rgba(192,32,58,0.06);--danger-border:rgba(192,32,58,0.25);
  --note-bg:rgba(112,64,176,0.06);--note-border:rgba(112,64,176,0.25);
}

/* ── Reset & Base ── */
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--text);font-family:'Inter',sans-serif;min-height:100vh;overflow-x:hidden;transition:background 0.4s,color 0.4s}

/* ── Background Canvas ── */
.bg-canvas{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden}
.orb{position:absolute;border-radius:50%;filter:blur(100px);opacity:var(--orb-opacity);animation:drift 22s ease-in-out infinite alternate}
.orb1{width:700px;height:700px;background:var(--cyan);top:-250px;left:-200px}
.orb2{width:550px;height:550px;background:var(--mint);bottom:-150px;right:-150px;animation-delay:-8s}
.orb3{width:400px;height:400px;background:var(--purple);top:35%;left:50%;animation-delay:-15s}
@keyframes drift{from{transform:translate(0,0) scale(1)}to{transform:translate(60px,80px) scale(1.1)}}
.grid-overlay{position:fixed;inset:0;z-index:0;pointer-events:none;background-image:linear-gradient(rgba(0,229,255,0.025) 1px,transparent 1px),linear-gradient(90deg,rgba(0,229,255,0.025) 1px,transparent 1px);background-size:42px 42px}
[data-theme="light"] .grid-overlay{background-image:linear-gradient(rgba(0,80,150,0.04) 1px,transparent 1px),linear-gradient(90deg,rgba(0,80,150,0.04) 1px,transparent 1px)}

/* ── Layout ── */
.main{position:relative;z-index:1;max-width:960px;margin:0 auto;padding:2.5rem 1.5rem 5rem}
@media(min-width:768px){.main{padding:3.5rem 2rem 6rem}}

/* ── Topbar ── */
.topbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:2.5rem;flex-wrap:wrap;gap:0.8rem}
.topbar-left{display:flex;align-items:center;gap:0.8rem;flex-wrap:wrap}
.ctrl-btn{display:flex;align-items:center;gap:0.5rem;font-family:'DM Mono',monospace;font-size:0.65rem;letter-spacing:0.08em;padding:0.42rem 0.9rem;border-radius:100px;border:1px solid var(--glass-border);background:var(--glass);color:var(--text-dim);cursor:pointer;transition:all 0.2s;backdrop-filter:blur(8px);white-space:nowrap;text-decoration:none}
.ctrl-btn:hover{border-color:var(--cyan);color:var(--cyan);background:var(--cyan-dim)}
.ctrl-btn svg{width:13px;height:13px;flex-shrink:0}

/* ── Hero ── */
.hero{text-align:center;margin-bottom:3.5rem;animation:heroIn 0.9s cubic-bezier(0.22,1,0.36,1) both}
@keyframes heroIn{from{opacity:0;transform:translateY(-28px)}to{opacity:1;transform:translateY(0)}}
.hero-org{display:inline-flex;align-items:center;gap:0.5rem;font-family:'DM Mono',monospace;font-size:0.6rem;letter-spacing:0.22em;text-transform:uppercase;color:var(--mint);background:var(--mint-dim);border:1px solid rgba(0,255,179,0.22);padding:0.33rem 1.1rem;border-radius:100px;margin-bottom:0.8rem}
.hero-org::before{content:'◈';font-size:0.75rem}
.hero-unit{display:inline-flex;align-items:center;gap:0.5rem;font-family:'DM Mono',monospace;font-size:0.58rem;letter-spacing:0.18em;text-transform:uppercase;color:var(--purple);background:var(--purple-dim);border:1px solid rgba(180,122,255,0.22);padding:0.33rem 1.1rem;border-radius:100px;margin-bottom:1.2rem}
.hero-unit::before{content:'◈';font-size:0.75rem}
.hero-instrument{display:inline-flex;align-items:center;gap:0.5rem;font-family:'DM Mono',monospace;font-size:0.58rem;letter-spacing:0.18em;text-transform:uppercase;color:var(--amber);background:var(--amber-dim);border:1px solid rgba(255,183,0,0.22);padding:0.33rem 1.1rem;border-radius:100px;margin-bottom:1.2rem}
.hero-instrument::before{content:'◈';font-size:0.75rem}
.hero h1{font-size:clamp(2.4rem,6vw,4rem);font-weight:900;line-height:1.05;letter-spacing:-0.04em;color:var(--text-bright);margin-bottom:0.3rem}
.hero h1 .g{background:linear-gradient(120deg,var(--cyan) 0%,var(--mint) 60%,var(--purple) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-sub{font-family:'Playfair Display',Georgia,serif;font-style:italic;font-size:1rem;color:var(--text-dim);margin-bottom:0.8rem}
.hero-desc{font-size:0.92rem;color:var(--text-dim);max-width:620px;margin:0 auto;line-height:1.7}

/* ── Section Labels ── */
.section-label{font-family:'DM Mono',monospace;font-size:0.6rem;letter-spacing:0.2em;text-transform:uppercase;color:var(--cyan);margin-bottom:1.2rem;padding-left:0.2rem}

/* ── Chapter Cards (Landing Page) ── */
.cards{display:grid;gap:1rem;margin-bottom:3rem}
@media(min-width:640px){.cards{grid-template-columns:1fr 1fr}}
.chapter-card{background:var(--card-bg);border:1px solid var(--card-border);border-radius:18px;padding:1.6rem;backdrop-filter:blur(18px);text-decoration:none;color:inherit;transition:all 0.3s;position:relative;overflow:hidden;display:block}
.chapter-card:hover{background:var(--card-hover);border-color:var(--cyan);transform:translateY(-2px)}
.chapter-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--cyan),var(--mint));opacity:0.5;transition:opacity 0.3s}
.chapter-card:hover::before{opacity:1}
.chapter-num{font-family:'DM Mono',monospace;font-size:0.52rem;letter-spacing:0.22em;text-transform:uppercase;color:var(--cyan);margin-bottom:0.5rem}
.chapter-icon{font-size:2rem;margin-bottom:0.5rem}
.chapter-title{font-size:1.1rem;font-weight:800;color:var(--text-bright);margin-bottom:0.3rem;letter-spacing:-0.02em}
.chapter-desc{font-size:0.82rem;color:var(--text-dim);line-height:1.6;margin-bottom:0.6rem}
.chapter-tags{display:flex;flex-wrap:wrap;gap:0.3rem}
.tag{font-family:'DM Mono',monospace;font-size:0.5rem;font-weight:500;letter-spacing:0.08em;padding:0.18rem 0.55rem;border-radius:100px;text-transform:uppercase}
.t-cyan{background:var(--cyan-dim);border:1px solid rgba(0,229,255,0.2);color:var(--cyan)}
.t-mint{background:var(--mint-dim);border:1px solid rgba(0,255,179,0.2);color:var(--mint)}
.t-amber{background:var(--amber-dim);border:1px solid rgba(255,183,0,0.2);color:var(--amber)}
.t-purple{background:var(--purple-dim);border:1px solid rgba(180,122,255,0.2);color:var(--purple)}
.t-red{background:var(--red-dim);border:1px solid rgba(255,77,109,0.2);color:var(--red)}
.card-footer{display:flex;justify-content:space-between;align-items:center;margin-top:0.8rem}
.card-arrow{font-size:1.2rem;color:var(--text-dim);transition:transform 0.3s,color 0.3s}
.chapter-card:hover .card-arrow{transform:translateX(4px);color:var(--cyan)}

/* ── Chapter Page Content ── */
.content{margin-bottom:3rem}
.content h2{font-size:1.6rem;font-weight:900;color:var(--text-bright);letter-spacing:-0.03em;margin:2.5rem 0 1rem;padding-bottom:0.5rem;border-bottom:1px solid var(--card-border)}
.content h3{font-size:1.15rem;font-weight:700;color:var(--text-bright);letter-spacing:-0.02em;margin:2rem 0 0.8rem}
.content h4{font-size:0.95rem;font-weight:700;color:var(--amber);margin:1.5rem 0 0.6rem}
.content p{font-size:0.92rem;color:var(--text);line-height:1.85;margin-bottom:1rem}
.content ul,.content ol{font-size:0.92rem;line-height:1.85;color:var(--text);margin:0 0 1.2rem 1.8rem}
.content li{margin-bottom:0.35rem}
.content li::marker{color:var(--cyan)}
.content strong{color:var(--text-bright);font-weight:700}
.content em{color:var(--text-dim)}

/* ── Step Lists ── */
.step-list{list-style:none;margin:0 0 1.5rem 0;padding:0;counter-reset:step-counter}
.step-list li{counter-increment:step-counter;position:relative;padding:1rem 1rem 1rem 3.2rem;margin-bottom:0.6rem;background:var(--card-bg);border:1px solid var(--card-border);border-radius:14px;backdrop-filter:blur(12px);font-size:0.88rem;line-height:1.7}
.step-list li::before{content:counter(step-counter);position:absolute;left:1rem;top:1rem;width:1.5rem;height:1.5rem;border-radius:50%;background:var(--cyan-dim);border:1px solid rgba(0,229,255,0.3);color:var(--cyan);font-family:'DM Mono',monospace;font-size:0.6rem;font-weight:700;display:flex;align-items:center;justify-content:center}

/* ── Info Boxes ── */
.info-box{border-radius:14px;padding:1.2rem 1.4rem;margin:1.2rem 0;font-size:0.85rem;line-height:1.7;backdrop-filter:blur(12px)}
.info-box .box-title{font-family:'DM Mono',monospace;font-size:0.6rem;letter-spacing:0.18em;text-transform:uppercase;margin-bottom:0.5rem;font-weight:700}
.tip{background:var(--tip-bg);border:1px solid var(--tip-border)}
.tip .box-title{color:var(--mint)}
.warn{background:var(--warn-bg);border:1px solid var(--warn-border)}
.warn .box-title{color:var(--amber)}
.danger{background:var(--danger-bg);border:1px solid var(--danger-border)}
.danger .box-title{color:var(--red)}
.note{background:var(--note-bg);border:1px solid var(--note-border)}
.note .box-title{color:var(--purple)}

/* ── Tables ── */
.table-wrap{overflow-x:auto;margin:1.2rem 0;border-radius:14px;border:1px solid var(--table-border);backdrop-filter:blur(12px)}
table{width:100%;border-collapse:collapse;font-size:0.82rem}
thead{background:var(--table-header)}
th{font-family:'DM Mono',monospace;font-size:0.6rem;letter-spacing:0.12em;text-transform:uppercase;color:var(--cyan);padding:0.8rem 1rem;text-align:left;font-weight:600;white-space:nowrap}
td{padding:0.7rem 1rem;border-top:1px solid var(--table-border);color:var(--text);line-height:1.5}
tr:nth-child(even){background:var(--table-row-alt)}

/* ── Code Blocks ── */
code{font-family:'DM Mono',monospace;font-size:0.8rem;background:var(--code-bg);border:1px solid var(--code-border);padding:0.15rem 0.45rem;border-radius:6px;color:var(--cyan)}
pre{background:var(--code-bg);border:1px solid var(--code-border);border-radius:14px;padding:1.2rem 1.4rem;overflow-x:auto;margin:1rem 0}
pre code{background:none;border:none;padding:0;font-size:0.78rem;color:var(--text);line-height:1.7}

/* ── Chapter Navigation (bottom) ── */
.chapter-nav{display:flex;gap:1rem;margin:3rem 0 2rem;flex-wrap:wrap}
.chapter-nav a{flex:1;min-width:200px;background:var(--card-bg);border:1px solid var(--card-border);border-radius:14px;padding:1.2rem;text-decoration:none;color:inherit;transition:all 0.3s;backdrop-filter:blur(12px)}
.chapter-nav a:hover{border-color:var(--cyan);background:var(--card-hover);transform:translateY(-2px)}
.nav-label{font-family:'DM Mono',monospace;font-size:0.5rem;letter-spacing:0.2em;text-transform:uppercase;color:var(--text-dim);margin-bottom:0.3rem}
.nav-title{font-size:0.9rem;font-weight:700;color:var(--text-bright)}
.nav-prev .nav-label::before{content:'← '}
.nav-next{text-align:right}
.nav-next .nav-label::after{content:' →'}

/* ── Spec Card ── */
.spec-grid{display:grid;gap:0.8rem;margin:1.2rem 0 1.5rem}
@media(min-width:500px){.spec-grid{grid-template-columns:1fr 1fr}}
@media(min-width:700px){.spec-grid{grid-template-columns:1fr 1fr 1fr}}
.spec-card{background:var(--card-bg);border:1px solid var(--card-border);border-radius:14px;padding:1.2rem;backdrop-filter:blur(12px);text-align:center}
.spec-value{font-size:1.6rem;font-weight:900;color:var(--text-bright);line-height:1}
.spec-value .unit{font-size:0.7rem;color:var(--cyan);font-weight:500}
.spec-label{font-family:'DM Mono',monospace;font-size:0.52rem;letter-spacing:0.18em;text-transform:uppercase;color:var(--text-dim);margin-top:0.35rem}

/* ── Author ── */
.author{display:flex;align-items:center;gap:1.2rem;background:var(--card-bg);border:1px solid var(--card-border);border-radius:18px;padding:1.5rem;backdrop-filter:blur(18px);margin-bottom:2rem;flex-wrap:wrap}
.author-img{width:52px;height:52px;border-radius:50%;border:2px solid var(--cyan-dim);flex-shrink:0}
.author-info{flex:1;min-width:180px}
.author-name{font-size:1rem;font-weight:800;color:var(--text-bright)}
.author-role{font-size:0.78rem;color:var(--text-dim);margin-top:0.15rem}
.author-links{display:flex;gap:0.5rem}
.author-link{font-family:'DM Mono',monospace;font-size:0.6rem;letter-spacing:0.1em;color:var(--cyan);text-decoration:none;border:1px solid var(--cyan-dim);padding:0.3rem 0.7rem;border-radius:100px;transition:all 0.2s}
.author-link:hover{background:var(--cyan-dim);border-color:var(--cyan)}

/* ── Footer ── */
.footer{text-align:center;font-family:'DM Mono',monospace;font-size:0.58rem;letter-spacing:0.14em;color:var(--text-dim);text-transform:uppercase;margin-top:2rem}

/* ── Reveal Animations ── */
.reveal{opacity:0;transform:translateY(30px);transition:opacity 0.7s ease,transform 0.7s ease}
.reveal.visible{opacity:1;transform:translateY(0)}
.reveal-d1{transition-delay:0.1s}.reveal-d2{transition-delay:0.2s}
.reveal-d3{transition-delay:0.3s}.reveal-d4{transition-delay:0.4s}
.reveal-d5{transition-delay:0.5s}.reveal-d6{transition-delay:0.6s}
.reveal-d7{transition-delay:0.7s}

/* ── Component Diagram ── */
.diagram{background:var(--card-bg);border:1px solid var(--card-border);border-radius:18px;padding:2rem;backdrop-filter:blur(18px);margin:1.5rem 0;overflow-x:auto}
.flow{display:flex;align-items:center;gap:0.4rem;flex-wrap:wrap;justify-content:center;min-width:500px}
.flow-node{background:var(--cyan-dim);border:1px solid rgba(0,229,255,0.25);border-radius:10px;padding:0.6rem 1rem;font-family:'DM Mono',monospace;font-size:0.65rem;letter-spacing:0.06em;color:var(--cyan);text-align:center;white-space:nowrap}
.flow-node.plasma{background:var(--red-dim);border-color:rgba(255,77,109,0.25);color:var(--red)}
.flow-node.cell{background:var(--mint-dim);border-color:rgba(0,255,179,0.25);color:var(--mint)}
.flow-node.quad{background:var(--purple-dim);border-color:rgba(180,122,255,0.25);color:var(--purple)}
.flow-node.detector{background:var(--amber-dim);border-color:rgba(255,183,0,0.25);color:var(--amber)}
.flow-arrow{color:var(--text-dim);font-size:1rem;flex-shrink:0}

/* ── Responsive ── */
@media(max-width:500px){
  .hero h1{font-size:1.8rem}
  .chapter-card{padding:1.2rem}
  .flow{min-width:0;flex-direction:column}
  .flow-arrow{transform:rotate(90deg)}
  .chapter-nav{flex-direction:column}
}

/* ── Print ── */
@media print{
  .bg-canvas,.grid-overlay,.topbar{display:none!important}
  body{background:white;color:#111}
  .chapter-card,.content,.info-box,.table-wrap{border:1px solid #ccc;box-shadow:none;backdrop-filter:none}
  .hero h1 .g{-webkit-text-fill-color:#0080aa}
}