/* ti-84calculator.com — design system (gramstocup model)
   Inter, lime #c2f711, dark #1a1a1a, light bg #f8f9fa, white cards, 1200px container */
:root{
  --lime:#c2f711; --lime-dark:#9dc90a; --dark:#1a1a1a; --bg:#f8f9fa;
  --card:#ffffff; --ink:#333333; --muted:#666666; --border:#e0e0e0;
  --cream:#efe3c8; --green-bg:#e9f7e4; --green-deep:#1e7a34; --green-ink:#144d22;
  --shadow:0 4px 6px rgba(0,0,0,.07); --shadow-lg:0 12px 32px rgba(0,0,0,.13);
  --radius:14px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Inter',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;background:var(--bg);color:var(--ink);line-height:1.65;font-size:17px}
img{max-width:100%;height:auto}
a{color:#33691e;text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1200px;margin:0 auto;padding:0 20px}
h1,h2,h3,h4{color:var(--dark);line-height:1.25;font-weight:800}
h1{font-size:2.5rem}
h2{font-size:1.75rem;margin:1.6em 0 .6em}
h3{font-size:1.3rem;margin:1.3em 0 .5em}
p{margin:.7em 0}
ul,ol{margin:.7em 0 .7em 1.4em}
li{margin:.3em 0}
table{width:100%;border-collapse:separate;border-spacing:0;margin:1.2em 0;background:var(--card);border:1.5px solid rgba(26,26,26,.14);border-radius:14px;overflow:hidden;box-shadow:var(--shadow)}
th,td{padding:11px 15px;border-bottom:1px solid #e8ecd9;text-align:left;font-size:.95rem}
th{background:var(--dark);color:var(--lime);font-weight:800;letter-spacing:.01em;border-bottom:3px solid var(--lime)}
td:first-child{font-weight:600}
tbody tr:nth-child(even) td{background:#f7faea}
tbody tr:hover td{background:#eff6d2}
tr:last-child td{border-bottom:none}
@media(max-width:640px){th,td{padding:9px 10px;font-size:.88rem}}
blockquote{border-left:4px solid var(--lime);background:#fff;padding:14px 18px;margin:1em 0;font-style:italic;border-radius:0 10px 10px 0;box-shadow:var(--shadow)}
code{background:#eef1e4;padding:1px 6px;border-radius:5px;font-size:.9em}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:#fff;box-shadow:0 2px 10px rgba(0,0,0,.08)}
.header-in{display:flex;align-items:center;gap:28px;height:68px}
.logo{font-size:1.35rem;font-weight:800;color:var(--dark);letter-spacing:-.02em;white-space:nowrap}
.logo:hover{text-decoration:none}
.logo .logo-mark{display:inline-block;background:var(--lime);color:var(--dark);border-radius:8px;padding:1px 9px;margin-right:8px;font-weight:800}
.logo img{height:42px;width:auto;display:block}
.site-footer .logo{display:inline-block;margin-bottom:14px}
.site-footer .logo img{height:46px}
.footer-tools{columns:2;column-gap:26px}
.main-nav{display:flex;gap:22px;margin-left:auto}
.main-nav a{color:var(--ink);font-weight:600;font-size:.98rem}
.btn-lime{display:inline-block;background:var(--lime);color:var(--dark)!important;font-weight:700;padding:10px 22px;border-radius:30px;box-shadow:var(--shadow)}
.btn-lime:hover{background:var(--lime-dark);text-decoration:none}
.header-cta{margin-left:6px}

/* hero */
.hero{position:relative;overflow:hidden;background:linear-gradient(135deg,#fdfdf8,#f1f6da)}
.hero-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.16;pointer-events:none}
.hero-shade{position:absolute;inset:0;background:linear-gradient(180deg,rgba(248,249,250,.25),rgba(248,249,250,.88))}
.hero-in{position:relative;padding:52px 0 34px;text-align:center}
.hero h1{max-width:900px;margin:0 auto}
.hero .promise{font-size:1.2rem;color:var(--muted);max-width:760px;margin:14px auto 0}
.hero-home{padding:64px 0 44px}
.hero-home .promise{margin-bottom:22px}

/* byline */
.byline{display:flex;flex-wrap:wrap;gap:12px 30px;justify-content:center;align-items:center;margin-top:20px;font-size:.93rem;color:var(--muted)}
.byline .who{display:inline-flex;align-items:center;gap:9px}
.byline img{width:38px;height:38px;border-radius:50%;object-fit:cover;border:2px solid var(--lime)}
.byline a{font-weight:700;color:var(--dark)}
.byline-left{justify-content:flex-start}

/* tool card */
.tool-wrap{position:relative;padding:6px 0 10px}
.tool-card{background:var(--card);border-radius:var(--radius);border-top:6px solid var(--lime);box-shadow:var(--shadow-lg);padding:28px;max-width:920px;margin:0 auto}
.tool-card h2{margin-top:0;font-size:1.4rem}
#tool-root label{display:block;font-weight:600;margin:12px 0 5px;color:var(--dark)}
#tool-root input[type="number"],#tool-root input[type="text"],#tool-root input[type="date"],
#tool-root select,#tool-root textarea{width:100%;padding:12px 14px;border:2px solid var(--border);border-radius:10px;font:inherit;font-size:1.05rem;background:#fff}
#tool-root input:focus,#tool-root select:focus{outline:none;border-color:var(--lime-dark)}
#tool-root button,.t-btn{background:var(--dark);color:#fff;border:none;border-radius:10px;padding:12px 24px;font:inherit;font-weight:700;cursor:pointer;margin-top:14px}
#tool-root button:hover,.t-btn:hover{background:#000}
#tool-root .btn-accent{background:var(--lime);color:var(--dark)}
#tool-root .btn-accent:hover{background:var(--lime-dark)}
.t-result{background:var(--green-bg);border:2px solid var(--green-deep);border-radius:12px;padding:18px 20px;margin-top:18px;font-size:1.15rem}
.t-result .big{font-size:1.9rem;font-weight:800;color:var(--green-ink);display:block}
.preset-row,.tool-presets{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:14px 0 4px}
.tool-presets>span{font-weight:600;color:var(--muted);font-size:.92rem;margin-right:2px}
.preset-row button,.tool-presets button,.chip,#tool-root .preset-chip{background:linear-gradient(135deg,rgba(194,247,17,.32),rgba(255,255,255,.55))!important;color:var(--dark)!important;border:1px solid rgba(26,26,26,.16)!important;padding:9px 16px!important;font-size:.92rem;font-weight:600;border-radius:14px!important;margin:0!important;cursor:pointer;backdrop-filter:blur(10px) saturate(1.5);-webkit-backdrop-filter:blur(10px) saturate(1.5);box-shadow:0 4px 14px rgba(26,26,26,.10),inset 0 1px 0 rgba(255,255,255,.85);transition:transform .15s ease,box-shadow .15s ease,border-color .15s ease}
.preset-row button:hover,.tool-presets button:hover,.chip:hover,#tool-root .preset-chip:hover{transform:translateY(-1px);border-color:rgba(26,26,26,.38)!important;box-shadow:0 8px 22px rgba(26,26,26,.15),inset 0 1px 0 rgba(255,255,255,.9)}
.t-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media(max-width:640px){.t-row{grid-template-columns:1fr}}

/* body content */
.content{max-width:920px;margin:0 auto;padding:10px 0 30px}
.hero-tool{padding:42px 0 4px}
.art-feat{max-width:920px;margin:28px auto 0}
.art-feat img{width:100%;height:auto;display:block;border-radius:16px;box-shadow:var(--shadow-lg)}
.article-head{max-width:920px;margin:0 auto;padding-top:6px}
.article-head h1{margin-bottom:6px}
/* stylish lists inside articles and pillars */
.content ul{list-style:none;margin:.9em 0;padding-left:0}
.content ul li{position:relative;padding-left:30px;margin:.5em 0}
.content ul li::before{content:"";position:absolute;left:2px;top:.48em;width:12px;height:12px;border-radius:4px;background:var(--lime);box-shadow:inset 0 0 0 2px #fff,0 0 0 1.5px rgba(26,26,26,.25)}
.content ol{margin:.9em 0;padding-left:1.5em}
.content ol li{margin:.5em 0;padding-left:6px}
.content ol li::marker{color:var(--lime-dark);font-weight:800}
.content .facts ul,.content .toc ul{list-style:none}
.content .facts ul li,.content .toc ul li{padding-left:0}
.content .facts ul li::before,.content .toc ul li::before{display:none;content:none}
/* highlighted internal links */
.content a:not(.tool-item):not(.art-item){color:var(--dark);font-weight:600;text-decoration:none;background:linear-gradient(180deg,transparent 62%,rgba(194,247,17,.55) 62%);border-radius:2px;padding:0 1px}
.content a:not(.tool-item):not(.art-item):hover{background:linear-gradient(180deg,transparent 40%,rgba(194,247,17,.85) 40%)}
.content .facts .src a{font-weight:600;background:none;color:var(--lime-dark);text-decoration:underline}
/* table of contents: visible, catchy, easy to scan */
.content .toc{background:linear-gradient(135deg,#ffffff,#f3f8df);border:1.5px solid rgba(26,26,26,.12);border-left:7px solid var(--lime);border-radius:16px;padding:20px 24px 14px;margin:26px 0;box-shadow:var(--shadow)}
.content .toc p{margin:0 0 6px}
.content .toc p strong{font-size:1.02rem;color:var(--dark);letter-spacing:.02em;text-transform:uppercase}
.content .toc ul{margin:6px 0 4px;counter-reset:toc;padding:0}
.content .toc li{counter-increment:toc;margin:2px 0;padding:0}
.content .toc li a{display:flex;align-items:baseline;gap:12px;background:none;font-weight:600;color:var(--dark);padding:7px 10px;border-radius:10px;transition:background .15s ease,transform .15s ease}
.content .toc li a::before{content:counter(toc,decimal-leading-zero);background:var(--lime);color:var(--dark);font-size:.76rem;font-weight:800;border-radius:7px;padding:2px 7px;flex:none;transform:translateY(-1px);box-shadow:0 2px 6px rgba(26,26,26,.15)}
.content .toc li a:hover{background:rgba(194,247,17,.30);transform:translateX(3px)}
@media(min-width:820px){.content .toc ul{columns:2;column-gap:36px}.content .toc li{break-inside:avoid}}
.content-wide{max-width:1200px}
.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:26px 28px;margin:22px 0}

/* facts */
.facts{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:26px 28px;margin:26px 0;border-left:6px solid var(--lime)}
.facts h2{margin-top:0}
.facts li{margin:.55em 0}
.facts .src{font-size:.88rem;color:var(--muted)}

/* green experience block */
.exp-block{background:var(--green-bg);border-left:6px solid var(--green-deep);border-radius:0 12px 12px 0;padding:20px 24px;margin:24px 0;color:var(--green-ink)}
.exp-block .exp-label{display:block;font-size:.78rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--green-deep);margin-bottom:8px}
.exp-block p{font-size:1.06rem;font-style:italic;margin:.3em 0}
.exp-block .exp-who{font-style:normal;font-weight:700;font-size:.92rem}

/* FAQ */
.faq{margin:26px 0}
.faq-item{background:#fff;border:1px solid var(--border);border-radius:10px;margin:10px 0;box-shadow:var(--shadow)}
.faq-item summary{cursor:pointer;font-weight:700;color:var(--dark);padding:15px 20px;list-style:none}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";float:right;font-size:1.3rem;color:var(--green-deep)}
.faq-item[open ] summary::after{content:"–"}
.faq-item .faq-a{padding:0 20px 16px}

/* charts */
.chart-box{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:20px;margin:22px 0}
.chart-box figcaption{font-weight:700;color:var(--dark);margin-bottom:10px}
.chart-box svg{width:100%;height:auto;display:block}
.chart-note{font-size:.86rem;color:var(--muted);margin-top:8px}

/* cards grid */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:20px;margin:26px 0}
.tool-item,.art-item{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;display:flex;flex-direction:column;transition:transform .15s ease,box-shadow .15s ease}
.tool-item:hover,.art-item:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.tool-item:hover,.art-item:hover{text-decoration:none}
.tool-thumb{height:150px;background:linear-gradient(135deg,#e8f5c8,#f6f1de);display:block;overflow:hidden}
.tool-thumb img{width:100%;height:100%;object-fit:cover}
.tool-body,.art-body{padding:16px 18px 20px}
.tool-body h3,.art-body h3{margin:0 0 6px;font-size:1.08rem}
.tool-body p,.art-body p{color:var(--muted);font-size:.93rem;margin:0}
.badge{display:inline-block;background:var(--cream);color:#7a5c00;font-size:.72rem;font-weight:800;letter-spacing:.06em;text-transform:uppercase;border-radius:20px;padding:3px 10px;margin-bottom:8px}
.badge-draft{background:#eee;color:#777}
.art-feat{display:block;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);margin:6px 0 20px}
.art-feat img{display:block;width:100%;height:auto}
.slot-empty{border:2px dashed var(--border);border-radius:var(--radius);padding:22px;color:var(--muted);background:#fff;text-align:center;font-weight:600}

/* trust strip */
.trust-strip{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px;margin:30px 0}
.trust-item{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:20px 22px;border-top:4px solid var(--lime)}
.trust-item h3{margin:0 0 6px;font-size:1.05rem}
.trust-item p{margin:0;color:var(--muted);font-size:.94rem}

/* author linkedin card */
.author-linkedin-card{display:flex;gap:22px;background:var(--dark);color:#f2f2f2;border-radius:var(--radius);padding:26px;margin:26px 0;box-shadow:var(--shadow-lg);flex-wrap:wrap}
.author-linkedin-card .author-photo{width:120px;height:120px;border-radius:50%;border:3px solid var(--lime);object-fit:cover}
.author-linkedin-card .author-name{font-size:1.35rem;font-weight:800;color:#fff;margin:0}
.author-linkedin-card .author-role{color:var(--lime);font-weight:600;margin:2px 0 8px;font-size:.95rem}
.author-linkedin-card .author-bio{color:#d9d9d9;margin:0 0 14px;max-width:640px}
.linkedin-btn{display:inline-flex;align-items:center;gap:9px;background:#fff;color:#0a66c2!important;font-weight:700;padding:9px 18px;border-radius:8px}
.linkedin-btn:hover{text-decoration:none;background:var(--lime);color:var(--dark)!important}
.author-head{display:flex;gap:24px;align-items:center;flex-wrap:wrap;margin:26px 0}
.author-head img{width:150px;height:150px;border-radius:50%;border:4px solid var(--lime);object-fit:cover}

/* footer */
.site-footer{background:var(--dark);color:#cfcfcf;margin-top:50px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1.2fr 1fr;gap:34px;padding:44px 0 30px}
.site-footer h4{color:var(--lime);margin-bottom:12px;font-size:1.02rem}
.site-footer a{color:#e8e8e8}
.site-footer ul{list-style:none;margin:0}
.site-footer li{margin:.4em 0}
.footer-bottom{border-top:1px solid #333;padding:16px 0 22px;font-size:.88rem;color:#9a9a9a;text-align:center}

/* article page */
.article-head{padding:38px 0 6px}
.article-head h1{text-align:left}
.meta-row{display:flex;gap:20px;flex-wrap:wrap;color:var(--muted);font-size:.92rem;margin-top:10px}
.draft-note{background:#fff7dd;border:1px solid #ecd27a;border-radius:10px;padding:14px 18px;margin:18px 0;font-size:.95rem}

@media(max-width:900px){h1{font-size:2rem}.main-nav{display:none}.tool-card{padding:20px}.footer-grid{grid-template-columns:1fr}}
@media(max-width:640px){.author-linkedin-card{flex-direction:column}.header-in{gap:14px}}