/* ==========================================================================
   ツール日和 - 共通スタイルシート (Pattern C: Left Fixed Sidebar & 5-Col Grid)
   ========================================================================== */
:root{--theme:#086c67;--dark:#075b57;--tint:#e9f2f1;--wash:#f8fbfa;--line:#dae9e8;--ink:#263736;--muted:#60716e;--danger:#c83a3a;--danger-bg:#fdf2f2;--success:#0b7a4b;--success-bg:#eefaf4}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:24px}
body{margin:0;color:var(--ink);background:var(--wash);font-family:-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,"Noto Sans JP",sans-serif;font-size:16px;line-height:1.75}
a{color:inherit;text-decoration:none}
button,select,input,textarea{font:inherit;color:inherit}
button{cursor:pointer}
h1,h2,h3,h4,p{margin:0}
h1,h2,h3,h4{line-height:1.55}
img{max-width:100%;display:block}
a,button{-webkit-tap-highlight-color:transparent}
a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid var(--theme);outline-offset:2px}
[hidden]{display:none!important}

/* Layout & Shell */
.wrap{width:calc(100% - 64px);max-width:1260px;margin-inline:auto}
.brand{display:inline-flex;align-items:center;gap:11px;font-size:30px;font-weight:800;letter-spacing:.015em;white-space:nowrap;line-height:1.3}
.brand-mark{display:grid;grid-template-columns:repeat(2,7px);grid-template-rows:repeat(2,7px);gap:3px;transform:rotate(-7deg)}
.brand-mark i{background:currentColor;border-radius:1.5px}

/* Left Fixed Sidebar (PC) */
.side-rail{display:flex;flex-direction:column;position:fixed;inset:0 auto 0 0;width:224px;padding:30px 23px 25px;background:var(--theme);color:white;z-index:20;overflow:hidden}
.side-rail .brand{font-size:25px;gap:8px}
.rail-sub{font-size:12px;color:#ffffffb8;margin-top:12px}
.rail-nav{display:flex;flex-direction:column;gap:5px;margin-top:32px}
.rail-nav a{display:flex;align-items:center;justify-content:space-between;font-size:14px;padding:11px 10px;border-radius:4px;margin-inline:-10px;gap:6px;transition:background .15s}
.rail-nav a:hover,.rail-nav a.is-active{background:#ffffff22;font-weight:600}
.rail-note{margin-top:auto;padding-top:42px;font-size:12px;color:#ffffffab}
.rail-note p{border-top:1px solid #ffffff30;padding-top:18px;line-height:1.9}

.site-shell{margin-left:224px;min-height:100vh;display:flex;flex-direction:column}
.site-shell > main{flex:1}

/* Masthead / Header */
.masthead{background:white;color:var(--ink);border-bottom:1px solid var(--line)}
.topline{display:none;font-size:12px;letter-spacing:.03em;padding-top:10px;opacity:.85}
.masthead-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;padding-block:18px;min-height:64px}
.masthead .brand{display:none}
.masthead .brand-group{display:block}
.masthead .brand-sub{display:block;opacity:1;color:var(--muted);font-size:13px}
.header-links{display:flex;gap:24px;font-size:13px}
.header-links a:hover,.header-links a[aria-current="page"]{color:var(--theme);text-decoration:underline;text-underline-offset:5px}

/* Mobile Category Nav */
.nav-wrap{display:none;background:var(--theme);color:white}
.category-nav{display:flex;overflow:auto;border-top:1px solid #ffffff30;scrollbar-width:thin;scrollbar-color:#ffffff77 transparent}
.category-nav a{padding:13px 24px;white-space:nowrap;font-size:14px;font-weight:600}
.category-nav a:first-child{padding-left:0;padding-right:27px}
.category-nav a:hover,.category-nav a.is-active{background:#ffffff1c}
.side-rail :focus-visible,.nav-wrap :focus-visible{outline-color:white;outline-offset:-3px}

/* Top Page Intro & Tool Grid */
.intro{padding:28px 0 25px}
.intro h1{font-size:25px;letter-spacing:.02em}
.intro h1 span{display:inline-block}
.intro p{font-size:14px;color:var(--muted);margin-top:5px}
.intro-line{display:flex;justify-content:space-between;align-items:center;gap:22px}
.tool-total{display:none}

.sections,.tool-section{min-width:0}
.tool-section{scroll-margin-top:24px;margin-bottom:27px}
.section-head{display:flex;align-items:center;gap:11px;border:0;padding-bottom:0;margin-bottom:13px}
.section-head h2{font-size:20px;color:var(--theme)}
.tool-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));list-style:none;padding:0;margin:0;gap:15px}
.tool-grid li{min-width:0}
.tool-card{display:block;height:100%;min-width:0;background:white;border:1px solid var(--line);border-radius:6px;overflow:hidden;transition:background .15s,border-color .15s,transform .15s}
.thumb{display:block;width:100%;height:auto;aspect-ratio:16/9;object-fit:cover;background:#e1e1e1;border-radius:0}
.tool-copy{padding:10px 12px 13px;min-width:0}
.tool-copy h3{font-size:15px;font-weight:700;line-height:1.65;overflow-wrap:anywhere}
.tool-copy p{font-size:13px;color:var(--muted);line-height:1.75;margin-top:3px;overflow-wrap:anywhere}
.tool-card:hover{background:var(--tint);border-color:var(--theme)}
.tool-card:hover h3{color:var(--theme)}
.tool-card.is-current-tool{border-color:var(--theme);background:var(--tint)}

/* Ad Slots */
.ad-slot{grid-column:1/-1;max-width:100%;min-width:0;margin:24px auto 29px;width:100%;text-align:center}
.ad-label{display:block;font-size:12px;letter-spacing:.06em;color:#7e8382;margin-bottom:7px}
.ad-surface{display:grid;place-items:center;min-height:90px;width:min(728px,100%);margin:auto;border:1px solid #e9eaea;background:white}
.ad-surface span{font-size:12px;color:#959a98;letter-spacing:.13em}
.ad-unit{width:100%;max-width:728px;margin:auto;overflow:hidden}

/* Footer */
.site-footer{border-top:1px solid var(--line);margin-top:40px;padding:26px 0 34px;background:white}
.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:25px}
.footer-brand{font-size:18px;font-weight:800;color:var(--theme)}
.footer-links{display:flex;gap:22px;flex-wrap:wrap;font-size:13px}
.footer-links a:hover{color:var(--theme);text-decoration:underline}
.copyright{font-size:12px;color:var(--muted);margin-top:7px}

.skip-link{position:fixed;top:-100px;left:12px;padding:8px 20px;background:white;color:var(--theme);z-index:60;border:2px solid var(--theme);border-radius:4px}
.skip-link:focus{top:10px}

/* ==========================================================================
   Individual Tool Pages & Static Pages
   ========================================================================== */
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--muted);padding:18px 0 8px}
.breadcrumb a:hover{color:var(--theme);text-decoration:underline}
.breadcrumb .sep{color:#b0c2bf;font-size:11px}

.page-header{padding:10px 0 22px}
.page-header .cat-badge{display:inline-block;font-size:12px;font-weight:700;color:var(--theme);background:var(--tint);border:1px solid var(--line);padding:2px 10px;border-radius:99px;margin-bottom:8px}
.page-header h1{font-size:24px;color:var(--ink);letter-spacing:.01em}
.page-header p{font-size:14px;color:var(--muted);margin-top:6px}

/* Tool Workspace Card */
.tool-workspace{background:white;border:1px solid var(--line);border-radius:8px;padding:26px;margin-bottom:28px;box-shadow:0 1px 3px rgba(8,108,103,.03)}
.tool-grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}
.tool-grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}

/* Form Controls */
.field-group{margin-bottom:18px}
.field-group:last-child{margin-bottom:0}
.field-label{display:flex;align-items:center;justify-content:space-between;font-size:14px;font-weight:700;color:var(--ink);margin-bottom:7px}
.field-label small{font-weight:400;font-size:12px;color:var(--muted)}
.text-input,.select-input,.textarea-input{width:100%;border:1px solid #c5d8d6;border-radius:6px;padding:10px 13px;font-size:15px;background:white;color:var(--ink);transition:border-color .15s,box-shadow .15s}
.text-input:focus,.select-input:focus,.textarea-input:focus{border-color:var(--theme);box-shadow:0 0 0 3px rgba(8,108,103,.12);outline:none}
.textarea-input{min-height:170px;resize:vertical;line-height:1.65;font-family:inherit}
.textarea-mono{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;font-size:14px}

/* Buttons */
.btn-row{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:14px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:10px 20px;border-radius:6px;font-size:14px;font-weight:700;border:1px solid transparent;transition:background .15s,color .15s,border-color .15s;line-height:1.4;white-space:nowrap}
.btn-primary{background:var(--theme);color:white}
.btn-primary:hover{background:var(--dark)}
.btn-secondary{background:var(--tint);color:var(--theme);border-color:var(--line)}
.btn-secondary:hover{background:#d8eae8}
.btn-outline{background:white;color:var(--ink);border-color:#c5d8d6}
.btn-outline:hover{background:var(--wash);border-color:var(--theme);color:var(--theme)}
.btn-sm{padding:6px 13px;font-size:13px;border-radius:5px}
.btn-lg{padding:13px 28px;font-size:16px}
.btn:disabled{opacity:.5;cursor:not-allowed}

/* Checkbox & Radio Pills */
.check-group{display:flex;flex-wrap:wrap;gap:10px 18px;margin-block:10px}
.check-item{display:inline-flex;align-items:center;gap:7px;font-size:14px;cursor:pointer;user-select:none}
.check-item input{width:17px;height:17px;accent-color:var(--theme);cursor:pointer}

/* Tabs */
.tab-nav{display:flex;flex-wrap:wrap;gap:6px;border-bottom:2px solid var(--line);margin-bottom:20px;padding-bottom:8px}
.tab-btn{background:var(--wash);border:1px solid var(--line);color:var(--muted);padding:8px 16px;border-radius:6px;font-size:14px;font-weight:700;transition:all .15s}
.tab-btn:hover{color:var(--theme);background:var(--tint)}
.tab-btn.is-active{background:var(--theme);color:white;border-color:var(--theme)}

/* Stat Cards & Result Displays */
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin-top:16px}
.stat-card{background:var(--wash);border:1px solid var(--line);border-radius:6px;padding:14px 16px;text-align:center}
.stat-card .stat-label{font-size:12px;color:var(--muted);display:block;margin-bottom:4px}
.stat-card .stat-val{font-size:24px;font-weight:800;color:var(--theme);line-height:1.3;font-variant-numeric:tabular-nums}
.stat-card .stat-unit{font-size:13px;font-weight:400;color:var(--muted);margin-left:3px}

.result-panel{background:var(--tint);border:1px solid var(--line);border-radius:6px;padding:18px 20px;margin-top:18px}
.result-panel h3{font-size:15px;color:var(--theme);margin-bottom:8px}
.result-big{font-size:28px;font-weight:800;color:var(--theme);font-variant-numeric:tabular-nums}

/* Dropzone for Image Tools */
.dropzone{border:2px dashed #9fc5c2;background:var(--wash);border-radius:8px;padding:34px 20px;text-align:center;cursor:pointer;transition:background .15s,border-color .15s}
.dropzone:hover,.dropzone.is-dragover{background:var(--tint);border-color:var(--theme)}
.dropzone-title{font-size:16px;font-weight:700;color:var(--theme);margin-bottom:6px}
.dropzone-sub{font-size:13px;color:var(--muted)}
.canvas-wrap{background:#f0f4f3;border:1px solid var(--line);border-radius:6px;padding:14px;text-align:center;overflow:auto;max-height:540px;margin-block:14px}
.canvas-wrap canvas,.canvas-wrap img{max-width:100%;height:auto;margin-inline:auto;display:block}

/* Tables */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:6px;background:white}
.data-table{width:100%;border-collapse:collapse;font-size:14px;text-align:left}
.data-table th,.data-table td{padding:10px 14px;border-bottom:1px solid var(--line)}
.data-table th{background:var(--tint);color:var(--theme);font-weight:700;white-space:nowrap}
.data-table tr:last-child td{border-bottom:0}
.data-table tr:hover td{background:var(--wash)}
.data-table .num{text-align:right;font-variant-numeric:tabular-nums}

/* Tool Explanation / Guide Section */
.tool-guide{background:white;border:1px solid var(--line);border-radius:8px;padding:24px 26px;margin-bottom:30px}
.tool-guide h2{font-size:18px;color:var(--theme);border-bottom:1px solid var(--line);padding-bottom:9px;margin-bottom:14px}
.tool-guide h3{font-size:15px;color:var(--ink);margin:16px 0 6px}
.tool-guide p,.tool-guide li{font-size:14px;color:var(--ink);line-height:1.8}
.tool-guide ul,.tool-guide ol{padding-left:20px;margin:8px 0}
.related-section{margin-top:32px;margin-bottom:28px}

/* Static Doc Pages (About / Privacy / Contact) */
.doc-card{background:white;border:1px solid var(--line);border-radius:8px;padding:30px 32px;margin-bottom:32px}
.doc-card h2{font-size:19px;color:var(--theme);border-bottom:2px solid var(--line);padding-bottom:8px;margin:28px 0 14px}
.doc-card h2:first-child{margin-top:0}
.doc-card h3{font-size:16px;color:var(--ink);margin:18px 0 8px}
.doc-card p,.doc-card li{font-size:15px;line-height:1.85;color:var(--ink)}
.doc-card p{margin-bottom:12px}
.doc-card ul{padding-left:22px;margin:8px 0 16px}
.req-badge{display:inline-block;background:var(--danger);color:white;font-size:11px;font-weight:700;padding:1px 6px;border-radius:3px;margin-left:6px}
.opt-badge{display:inline-block;background:var(--muted);color:white;font-size:11px;font-weight:700;padding:1px 6px;border-radius:3px;margin-left:6px}
.alert-box{padding:15px 18px;border-radius:6px;margin-bottom:20px;font-size:14px;line-height:1.7}
.alert-error{background:var(--danger-bg);border:1px solid #f1b8b8;color:var(--danger)}
.alert-success{background:var(--success-bg);border:1px solid #a8dfc4;color:var(--success)}

/* Toast Notification */
.toast{position:fixed;bottom:24px;right:24px;background:var(--ink);color:white;padding:10px 20px;border-radius:6px;font-size:14px;font-weight:600;box-shadow:0 4px 12px rgba(0,0,0,.18);z-index:100;transition:opacity .2s}

/* Responsive Breakpoints (Preserved from pattern-c-left-grid.html) */
@media(max-width:1170px){
  .side-rail{width:200px;padding-inline:20px}
  .side-rail .brand{font-size:23px}
  .site-shell{margin-left:200px}
  .wrap{width:calc(100% - 44px)}
  .tool-grid{gap:12px}
  .tool-copy{padding:9px 10px 12px}
  .tool-copy h3{font-size:14px}
}
@media(min-width:721px) and (max-width:1000px){
  .tool-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
  .tool-grid-2{grid-template-columns:1fr}
}
@media(max-width:720px){
  .side-rail{display:none}
  .site-shell{margin-left:0}
  .masthead{background:var(--theme);color:white;border:0}
  .masthead .brand{display:inline-flex;font-size:26px}
  .masthead .brand-sub{display:none}
  .masthead-inner{padding-block:22px}
  .header-links{display:none}
  .wrap{width:calc(100% - 32px)}
  .nav-wrap{display:block}
  .category-nav{width:100%;padding-inline:16px}
  .category-nav a,.category-nav a:first-child{padding:11px 16px;font-size:14px}
  .category-nav a:first-child{padding-left:0}
  .intro{padding:23px 0}
  .intro h1{font-size:22px}
  .intro p{font-size:14px}
  .section-head{margin-bottom:14px;gap:9px}
  .section-head h2{font-size:19px}
  .tool-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px 12px}
  .tool-grid-2,.tool-grid-3{grid-template-columns:1fr}
  .thumb{aspect-ratio:16/9}
  .tool-copy{padding:9px 10px 12px}
  .tool-copy h3{font-size:15px}
  .tool-copy p{font-size:14px;line-height:1.65}
  .tool-section{margin-bottom:28px}
  .tool-workspace,.doc-card,.tool-guide{padding:18px 16px}
  .ad-slot{margin-block:24px 28px}
  .ad-surface{min-height:100px}
  .footer-inner{display:block}
  .footer-links{margin-top:15px;gap:9px 19px}
  .site-footer{padding-bottom:30px}
}
@media(min-width:721px){
  .side-rail{inset:0 auto auto 0;height:100vh;height:100dvh;padding-block:clamp(14px,3vh,30px);overflow:hidden}
  .side-rail>*{flex-shrink:0}
  .rail-nav{margin-top:clamp(16px,3.5vh,32px);gap:clamp(0px,.5vh,5px)}
  .rail-nav a{min-height:34px;padding-block:clamp(6px,1.15vh,11px)}
  .rail-note{margin-top:auto;padding-top:clamp(12px,2vh,20px)}
  .rail-note p{padding-top:12px}
}
@media(min-width:721px) and (max-height:560px){
  .side-rail{padding-block:12px}
  .side-rail .brand{font-size:23px}
  .rail-sub{margin-top:7px;line-height:1.6}
  .rail-nav{margin-top:14px;gap:0}
  .rail-nav a{min-height:32px;padding-block:4px}
  .rail-note{padding-top:10px}
  .rail-note p{padding-top:10px;line-height:1.8}
}
@media(min-width:721px) and (max-height:390px){
  .side-rail{padding-block:10px}
  .rail-nav{margin-top:6px}
  .rail-nav a{min-height:29px;padding-block:2px;line-height:1.6}
  .rail-note{padding-top:6px}
  .rail-note p{padding-top:6px;line-height:1.6}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}