/* Tools-only dark shop layout; calculators and purchase flows are untouched. */
body{background:radial-gradient(ellipse at 15% 0,#143c59 0,transparent 48%),radial-gradient(ellipse at 90% 40%,#24213e 0,transparent 50%),#071725;color:#e7f1fa}
.tool-directory{background:#0c2234;border-color:#29475e;box-shadow:0 18px 55px #0004}
.directory-heading h1{color:#f2f7ff}.directory-heading p,.directory-status,.directory-footnote{color:#adbdcf}.directory-guide{color:#77e3ed}
.tool-nav #directory-toggle,.directory-search-row button{background:#18384f;color:#e7f1fa;border-color:#35566d}.directory-search-row input{background:#081a29;color:#eff8ff;border-color:#35566d}.directory-search-row input::placeholder{color:#a8baca}
.directory-categories{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin:22px 0 0}
.directory-categories button{position:relative;display:grid;grid-template-columns:42px 1fr;gap:6px 10px;align-items:center;text-align:left;min-height:108px;padding:18px;background:linear-gradient(135deg,#17364e,#102638);color:#e7f1fa;border:1px solid #36566e;border-radius:16px;white-space:normal}
.directory-categories button[data-category=all]{grid-column:1/-1;min-height:56px;display:flex;justify-content:center;padding:12px}
.directory-categories button::before{content:'✦';display:grid;place-items:center;width:42px;height:42px;border-radius:12px;background:#76daec18;color:#82e2ec;font-size:26px;grid-row:1/3}
.directory-categories button[data-category=progress]::before{content:'↗'}.directory-categories button[data-category=equipment]::before{content:'⚒'}.directory-categories button[data-category=database]::before{content:'◎'}.directory-categories button[data-category=simulate]::before{content:'✧'}.directory-categories button[data-category=all]::before{content:none}
.directory-categories button[aria-pressed=true]{background:linear-gradient(135deg,#215574,#173651);border-color:#68dce5;box-shadow:inset 0 0 0 1px #68dce5}
.directory-categories .category-count{grid-column:2;color:#9fbed4;font-size:13px}.directory-categories button:hover{border-color:#6cbdcc}
.directory-grid{gap:18px}.directory-card{display:flex;flex-direction:column;min-height:238px;padding:0 20px 18px;gap:10px;background:#112b40;border-color:#34546e;border-radius:18px;overflow:hidden;color:#eef8ff;transition:transform .15s,box-shadow .15s,border-color .15s}
.directory-card .directory-icon{width:calc(100% + 40px);height:82px;margin:0 -20px 6px;display:grid;place-items:center;border-radius:0;background:radial-gradient(ellipse at 50% 20%,#67d9e833,transparent 70%),linear-gradient(135deg,#1d4864,#243650);font-size:43px;color:#98edf5}
.directory-card strong{font-size:19px}.directory-card>span:not(.directory-icon){color:#b7ccdd}.directory-card>span.directory-action{margin-top:auto;padding-top:10px;color:#78e4ec;font-weight:700}.directory-card:hover{transform:translateY(-3px);border-color:#73d5df;box-shadow:0 12px 28px #0004}.directory-guide:focus-visible{outline:3px solid #68dce5;outline-offset:3px}
@media(max-width:800px){.directory-categories{grid-template-columns:repeat(2,minmax(0,1fr))}.directory-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:520px){.directory-categories button{padding:12px;grid-template-columns:30px 1fr;min-height:98px;font-size:14px;gap:6px}.directory-categories button::before{width:30px;height:34px;font-size:21px}.directory-grid{grid-template-columns:1fr}.directory-card{min-height:210px}.directory-card .directory-icon{height:72px}.directory-heading h1{font-size:27px}}
@media(max-width:520px){.tool-nav nav{display:flex;flex-wrap:wrap;gap:8px;width:100%;min-width:0}.tool-nav nav a{display:flex;align-items:center;flex:0 0 auto;width:auto;min-width:0;max-width:100%;box-sizing:border-box;font-size:13px;padding:10px 12px}.tool-nav{gap:10px;padding:12px 16px}}
@media(prefers-reduced-motion:reduce){.directory-card{transition:none}.directory-card:hover{transform:none}}