/* =========================================================
   DocSheet — style.css
   Design language: "Drafting Table" — blueprint grids, vellum
   paper, corner registration marks, mono technical labels.
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,500;9..144,600;9..144,700&family=Inter:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

:root{
  /* --- Color tokens --- */
  --ink-900:#0E2A3D;      /* deep blueprint ink */
  --ink-800:#153B52;
  --blue-700:#1C4E6E;     /* surfaces on dark */
  --blue-600:#2C6A8F;
  --cyan-400:#4FB3BF;     /* grid line / secondary accent */
  --amber-500:#E8A33D;    /* signal accent / CTA */
  --amber-600:#CF8A28;
  --vellum-100:#F3EEE1;   /* light bg */
  --vellum-050:#FAF7EF;
  --chalk-050:#EAF2F5;    /* light text on dark */
  --paper-line:#D8CFB8;   /* hairline on light */
  --ink-text:#16222B;
  --muted:#5B6B75;

  --font-display:'Fraunces', serif;
  --font-body:'Inter', sans-serif;
  --font-mono:'IBM Plex Mono', monospace;

  --radius-sm:6px;
  --radius-md:10px;
  --radius-lg:18px;

  --shadow-1: 0 1px 2px rgba(14,42,61,.06), 0 2px 8px rgba(14,42,61,.06);
  --shadow-2: 0 8px 24px rgba(14,42,61,.12);

  --bg: var(--vellum-050);
  --surface: #ffffff;
  --text: var(--ink-text);
  --border: var(--paper-line);
}

[data-theme="dark"]{
  --bg: var(--ink-900);
  --surface: var(--ink-800);
  --text: var(--chalk-050);
  --border: #234A62;
  --muted: #9FB4BF;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font-body);
  background:var(--bg);
  color:var(--text);
  transition:background .25s ease, color .25s ease;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit; text-decoration:none;}
img{max-width:100%; display:block;}
h1,h2,h3,h4{font-family:var(--font-display); font-weight:600; line-height:1.1; margin:0 0 .5em;}
p{line-height:1.6; color:var(--muted);}
.mono{font-family:var(--font-mono);}
.container{max-width:1180px; margin:0 auto; padding:0 24px;}

/* Faint blueprint grid used as background texture */
.grid-bg{
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size:32px 32px;
  background-position:center;
  opacity:.35;
  position:absolute; inset:0; pointer-events:none;
}

/* =============== Header / Nav =============== */
.site-header{
  position:sticky; top:0; z-index:100;
  background:var(--surface);
  border-bottom:1px solid var(--border);
}
.nav{
  display:flex; align-items:center; justify-content:space-between;
  padding:14px 24px; max-width:1180px; margin:0 auto;
}
.brand{display:flex; align-items:center; gap:10px; font-family:var(--font-display); font-weight:700; font-size:1.3rem;}
.brand-mark{
  width:34px; height:34px; border-radius:8px;
  background:linear-gradient(145deg, var(--ink-900), var(--blue-600));
  display:flex; align-items:center; justify-content:center;
  color:var(--amber-500); font-family:var(--font-mono); font-weight:600; font-size:.85rem;
  border:1px solid var(--amber-500);
}
.nav-links{display:flex; gap:28px; align-items:center;}
.nav-links a{font-weight:500; font-size:.95rem; color:var(--text); opacity:.85;}
.nav-links a:hover{opacity:1; color:var(--amber-600);}
.nav-dropdown{position:relative;}
.nav-dropdown .dropdown-panel{
  display:none; position:absolute; top:130%; left:50%; transform:translateX(-50%);
  background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-md);
  box-shadow:var(--shadow-2); padding:10px; min-width:200px; z-index:50;
}
.nav-dropdown:hover .dropdown-panel{display:block;}
.dropdown-panel a{display:block; padding:8px 10px; border-radius:6px; font-size:.9rem;}
.dropdown-panel a:hover{background:var(--bg);}
.nav-actions{display:flex; align-items:center; gap:14px;}
.theme-toggle{
  width:38px; height:38px; border-radius:50%; border:1px solid var(--border);
  background:var(--bg); cursor:pointer; display:flex; align-items:center; justify-content:center;
  color:var(--text); font-size:1rem;
}
.hamburger{display:none; background:none; border:none; font-size:1.4rem; color:var(--text); cursor:pointer;}

/* =============== Buttons =============== */
.btn{
  display:inline-flex; align-items:center; gap:8px;
  padding:12px 22px; border-radius:var(--radius-sm); font-weight:600; font-size:.95rem;
  border:1px solid transparent; cursor:pointer; transition:transform .15s ease, box-shadow .15s ease;
}
.btn:active{transform:translateY(1px);}
.btn-primary{background:var(--amber-500); color:var(--ink-900); box-shadow:var(--shadow-1);}
.btn-primary:hover{background:var(--amber-600); box-shadow:var(--shadow-2);}
.btn-outline{background:transparent; border-color:var(--border); color:var(--text);}
.btn-outline:hover{border-color:var(--amber-500); color:var(--amber-600);}
.btn-sm{padding:8px 14px; font-size:.85rem;}
.btn-block{width:100%; justify-content:center;}

/* =============== Hero =============== */
.hero{
  position:relative; overflow:hidden;
  background:var(--ink-900); color:var(--chalk-050);
  padding:96px 0 110px;
}
.hero .container{position:relative; z-index:2;}
.eyebrow{
  font-family:var(--font-mono); text-transform:uppercase; letter-spacing:.14em;
  font-size:.75rem; color:var(--cyan-400); display:flex; align-items:center; gap:10px; margin-bottom:18px;
}
.eyebrow::before{content:''; width:26px; height:1px; background:var(--cyan-400);}
.hero h1{font-size:clamp(2.2rem, 4.5vw, 3.6rem); max-width:820px; color:#fff;}
.hero h1 em{font-style:normal; color:var(--amber-500);}
.hero-sub{color:#B9CBD3; font-size:1.1rem; max-width:640px; margin-bottom:34px;}

/* Drafting-table upload card with registration corner marks */
.dropzone{
  position:relative;
  background:var(--vellum-050);
  border:1.5px dashed var(--blue-600);
  border-radius:var(--radius-lg);
  padding:48px 32px;
  max-width:760px;
  color:var(--ink-text);
  text-align:center;
  cursor:pointer;
  transition:border-color .2s ease, background .2s ease;
}
.dropzone.dragover{border-color:var(--amber-500); background:#fff;}
.dropzone .corner{position:absolute; width:18px; height:18px; border:2px solid var(--amber-500);}
.dropzone .corner.tl{top:-2px; left:-2px; border-right:none; border-bottom:none;}
.dropzone .corner.tr{top:-2px; right:-2px; border-left:none; border-bottom:none;}
.dropzone .corner.bl{bottom:-2px; left:-2px; border-right:none; border-top:none;}
.dropzone .corner.br{bottom:-2px; right:-2px; border-left:none; border-top:none;}
.dropzone-icon{font-size:2.4rem; color:var(--blue-600); margin-bottom:14px;}
.dropzone h3{margin-bottom:6px; font-size:1.25rem;}
.dropzone p{margin:0 0 18px;}
.dropzone input[type=file]{display:none;}
.formats-row{
  display:flex; flex-wrap:wrap; gap:8px; justify-content:center; margin-top:22px;
}
.format-chip{
  font-family:var(--font-mono); font-size:.72rem; letter-spacing:.03em;
  padding:5px 10px; border:1px solid var(--border); border-radius:999px; color:var(--muted);
  background:var(--surface);
}
.privacy-note{
  display:flex; align-items:center; gap:8px; margin-top:26px; font-size:.85rem; color:#9FB4BF;
}
.privacy-note i{color:var(--cyan-400);}

/* =============== Sections =============== */
.section{padding:84px 0;}
.section-head{max-width:640px; margin:0 auto 48px; text-align:center;}
.section-head .eyebrow{justify-content:center; color:var(--amber-600);}
.section-head .eyebrow::before{background:var(--amber-600);}
[data-theme="dark"] .section-head .eyebrow{color:var(--cyan-400);}
[data-theme="dark"] .section-head .eyebrow::before{background:var(--cyan-400);}
.section-head h2{font-size:clamp(1.7rem,3vw,2.3rem);}

/* Tool grid */
.tool-grid{
  display:grid; grid-template-columns:repeat(4, 1fr); gap:18px;
}
.tool-card{
  background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-md);
  padding:24px 20px; transition:transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.tool-card:hover{transform:translateY(-3px); box-shadow:var(--shadow-2); border-color:var(--amber-500);}
.tool-card .tool-icon{
  width:44px; height:44px; border-radius:9px; display:flex; align-items:center; justify-content:center;
  background:var(--bg); color:var(--amber-600); font-size:1.2rem; margin-bottom:16px;
}
.tool-card h4{font-size:1rem; margin-bottom:6px;}
.tool-card p{font-size:.85rem; margin:0;}
.tool-card .tool-tag{
  display:inline-block; margin-top:12px; font-family:var(--font-mono); font-size:.68rem;
  color:var(--muted); letter-spacing:.04em;
}

/* Features */
.feature-grid{display:grid; grid-template-columns:repeat(3,1fr); gap:28px;}
.feature{padding:8px;}
.feature .num{font-family:var(--font-mono); color:var(--amber-600); font-size:.8rem; margin-bottom:10px; display:block;}
.feature h4{font-size:1.05rem; margin-bottom:8px;}
.feature p{font-size:.92rem;}

/* How it works */
.steps{display:grid; grid-template-columns:repeat(3,1fr); gap:24px; counter-reset:step;}
.step{position:relative; padding:28px 22px; border:1px solid var(--border); border-radius:var(--radius-md); background:var(--surface);}
.step::before{
  counter-increment:step; content: counter(step, decimal-leading-zero);
  font-family:var(--font-mono); font-size:.75rem; color:var(--amber-600);
  display:block; margin-bottom:10px;
}
.step h4{font-size:1rem; margin-bottom:6px;}
.step p{font-size:.88rem; margin:0;}

/* FAQ */
.faq-item{border-bottom:1px solid var(--border);}
.faq-q{
  width:100%; text-align:left; background:none; border:none; cursor:pointer;
  padding:20px 4px; display:flex; justify-content:space-between; align-items:center;
  font-weight:600; color:var(--text); font-size:.98rem;
}
.faq-q i{transition:transform .2s ease; color:var(--amber-600);}
.faq-item.open .faq-q i{transform:rotate(45deg);}
.faq-a{max-height:0; overflow:hidden; transition:max-height .25s ease;}
.faq-a p{padding:0 4px 20px;}

/* Blog */
.blog-grid{display:grid; grid-template-columns:repeat(3,1fr); gap:22px;}
.blog-card{border:1px solid var(--border); border-radius:var(--radius-md); overflow:hidden; background:var(--surface);}
.blog-thumb{height:140px; background:linear-gradient(135deg, var(--ink-900), var(--blue-600)); display:flex; align-items:center; justify-content:center; color:var(--amber-500); font-size:1.8rem;}
.blog-body{padding:18px;}
.blog-body .eyebrow{margin-bottom:8px; font-size:.68rem;}
.blog-body h4{font-size:1rem; margin-bottom:8px;}
.blog-body p{font-size:.85rem;}

/* =============== Footer =============== */
.site-footer{background:var(--ink-900); color:#C7D6DC; padding:56px 0 26px; margin-top:60px;}
.footer-grid{display:grid; grid-template-columns:2fr repeat(3,1fr); gap:32px; padding-bottom:36px; border-bottom:1px solid #234A62;}
.footer-col h5{font-family:var(--font-mono); font-size:.78rem; text-transform:uppercase; letter-spacing:.08em; color:var(--cyan-400); margin-bottom:16px;}
.footer-col a{display:block; font-size:.88rem; color:#C7D6DC; opacity:.85; margin-bottom:10px;}
.footer-col a:hover{opacity:1; color:var(--amber-500);}
.footer-bottom{display:flex; justify-content:space-between; align-items:center; padding-top:22px; font-size:.8rem; color:#8FA3AC; flex-wrap:wrap; gap:10px;}

/* =============== Viewer Toolbar / Workspace =============== */
.viewer-page-hero{
  background:var(--ink-900); color:#fff; padding:56px 0 40px;
}
.viewer-page-hero h1{font-size:clamp(1.7rem,3.5vw,2.4rem); color:#fff;}
.breadcrumb{font-family:var(--font-mono); font-size:.72rem; color:var(--cyan-400); margin-bottom:16px;}
.breadcrumb a{color:var(--cyan-400); opacity:.8;}
.breadcrumb a:hover{opacity:1;}

.workspace{padding:44px 0 90px;}
.workspace-layout{display:grid; grid-template-columns:1fr 300px; gap:26px; align-items:start;}
.viewer-panel{
  background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-lg);
  min-height:520px; display:flex; flex-direction:column; overflow:hidden;
}
.viewer-toolbar{
  display:flex; align-items:center; justify-content:space-between; gap:10px; flex-wrap:wrap;
  padding:12px 16px; border-bottom:1px solid var(--border); background:var(--bg);
}
.toolbar-group{display:flex; align-items:center; gap:6px;}
.icon-btn{
  width:34px; height:34px; border-radius:7px; border:1px solid var(--border); background:var(--surface);
  color:var(--text); cursor:pointer; display:flex; align-items:center; justify-content:center; font-size:.9rem;
}
.icon-btn:hover{border-color:var(--amber-500); color:var(--amber-600);}
.icon-btn:disabled{opacity:.4; cursor:not-allowed;}
.page-indicator, .zoom-indicator{font-family:var(--font-mono); font-size:.8rem; min-width:70px; text-align:center;}
.search-box{
  display:flex; align-items:center; gap:6px; background:var(--surface); border:1px solid var(--border);
  border-radius:7px; padding:4px 10px;
}
.search-box input{border:none; background:none; outline:none; font-size:.85rem; width:120px; color:var(--text);}

.viewer-stage{
  flex:1; overflow:auto; padding:24px; background:repeating-linear-gradient(45deg, var(--bg) 0 10px, var(--surface) 10px 20px);
  display:flex; flex-direction:column; align-items:center; gap:18px;
}
[data-theme="dark"] .viewer-stage{background:var(--ink-900);}
.viewer-stage canvas{box-shadow:var(--shadow-2); border-radius:4px; background:#fff;}
.viewer-empty{
  margin:auto; text-align:center; color:var(--muted); padding:60px 20px;
}
.viewer-empty .dropzone-icon{font-size:2.6rem; margin-bottom:14px; color:var(--blue-600);}

.doc-content-frame{
  background:#fff; color:#16222B; width:100%; max-width:820px; padding:48px; border-radius:6px;
  box-shadow:var(--shadow-2); font-family:'Georgia', serif; line-height:1.7;
}
.doc-content-frame table{border-collapse:collapse; width:100%;}
.doc-content-frame td, .doc-content-frame th{border:1px solid #ddd; padding:6px 10px; font-size:.9rem;}

.sheet-tabs{display:flex; gap:6px; padding:10px 16px; border-bottom:1px solid var(--border); overflow-x:auto; background:var(--surface);}
.sheet-tab{
  font-family:var(--font-mono); font-size:.78rem; padding:6px 12px; border-radius:6px 6px 0 0;
  border:1px solid var(--border); border-bottom:none; background:var(--bg); color:var(--muted); cursor:pointer; white-space:nowrap;
}
.sheet-tab.active{background:var(--surface); color:var(--amber-600); border-color:var(--amber-500);}
.sheet-table-wrap{overflow:auto; flex:1; padding:0;}
table.data-table{border-collapse:collapse; width:100%; font-size:.82rem;}
table.data-table th, table.data-table td{border:1px solid var(--border); padding:6px 10px; white-space:nowrap;}
table.data-table th{background:var(--bg); position:sticky; top:0; font-family:var(--font-mono); font-weight:600;}

.slide-viewer{display:flex; flex-direction:column; align-items:center; gap:16px; width:100%;}
.slide-frame{
  background:#fff; color:#16222B; width:100%; max-width:820px; aspect-ratio:16/9; border-radius:6px;
  box-shadow:var(--shadow-2); padding:40px; overflow:auto;
}
.slide-frame h2{font-size:1.4rem; margin-bottom:14px;}
.slide-frame ul{padding-left:20px;}
.slide-nav{display:flex; align-items:center; gap:14px;}

pre.code-view{
  width:100%; max-width:820px; background:var(--surface); border:1px solid var(--border); border-radius:8px;
  padding:20px; font-family:var(--font-mono); font-size:.82rem; overflow:auto; white-space:pre-wrap; word-break:break-word;
}
.markdown-view{
  background:#fff; color:#16222B; width:100%; max-width:820px; padding:40px; border-radius:6px; box-shadow:var(--shadow-2);
  line-height:1.7;
}

/* Sidebar (info + ad) */
.sidebar-card{
  background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-md); padding:20px; margin-bottom:18px;
}
.sidebar-card h5{font-family:var(--font-mono); font-size:.75rem; text-transform:uppercase; letter-spacing:.06em; color:var(--muted); margin-bottom:12px;}
.file-meta-row{display:flex; justify-content:space-between; font-size:.85rem; padding:6px 0; border-bottom:1px dashed var(--border);}
.file-meta-row:last-child{border-bottom:none;}
.file-meta-row span:first-child{color:var(--muted);}
.file-meta-row span:last-child{font-family:var(--font-mono);}

/* Ad slots */
.ad-slot{
  border:1px dashed var(--border); border-radius:var(--radius-md); background:var(--surface);
  display:flex; align-items:center; justify-content:center; color:var(--muted);
  font-family:var(--font-mono); font-size:.72rem; text-transform:uppercase; letter-spacing:.05em;
  min-height:90px; margin:28px 0;
}
.ad-slot.ad-sidebar{min-height:250px;}
.ad-slot.ad-sticky{
  position:fixed; bottom:0; left:0; right:0; z-index:200; min-height:56px; border-radius:0; border-width:1px 0 0;
  display:none;
}

/* SEO content blocks */
.howto-list{counter-reset:howto; list-style:none; padding:0; margin:0; max-width:760px;}
.howto-list li{
  position:relative; padding:16px 0 16px 46px; border-bottom:1px solid var(--border);
}
.howto-list li::before{
  counter-increment:howto; content:counter(howto);
  position:absolute; left:0; top:14px; width:28px; height:28px; border-radius:50%;
  background:var(--ink-900); color:var(--amber-500); font-family:var(--font-mono); font-size:.8rem;
  display:flex; align-items:center; justify-content:center;
}
.howto-list h4{font-size:.98rem; margin-bottom:4px;}
.howto-list p{margin:0; font-size:.88rem;}

.more-tools-grid{display:grid; grid-template-columns:repeat(2,1fr); gap:16px;}

/* Utility / misc */
.badge-amber{background:var(--amber-500); color:var(--ink-900); font-family:var(--font-mono); font-size:.68rem; padding:3px 8px; border-radius:999px;}
.text-center{text-align:center;}
.mt-24{margin-top:24px;}
.mb-24{margin-bottom:24px;}
.hidden{display:none !important;}
.spinner{
  width:34px; height:34px; border-radius:50%; border:3px solid var(--border); border-top-color:var(--amber-500);
  animation:spin .8s linear infinite;
}
@keyframes spin{to{transform:rotate(360deg);}}
.progress-bar{height:4px; width:100%; background:var(--border); border-radius:4px; overflow:hidden;}
.progress-bar > span{display:block; height:100%; background:var(--amber-500); width:0%; transition:width .2s ease;}

::selection{background:var(--amber-500); color:var(--ink-900);}