/* Danh sách công cụ; giữ nguyên head/nav APMaths. */
main.container:has(.tools-directory){max-width:1164px;padding:0 32px;background:transparent;box-shadow:none;}
.tools-directory{max-width:1100px;margin:0 auto;color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;}
.tools-directory *{box-sizing:border-box;}
        /* Main */
        .tools-directory {
            padding: 38px 0 50px;
        }
        .tools-directory .hero {
            text-align: center;
            margin-bottom: 42px;
        }
        .tools-directory .hero h1 {
            margin: 0 0 12px;
            font-size: clamp(30px, 5vw, 44px);
            color: var(--text);
        }
        .tools-directory .hero p {
            text-align: center;
            margin: 0 auto;
            max-width: 680px;
            line-height: 1.7;
            color: var(--text-muted);
            font-size: 16px;
        }

        /* Tools */
        .tools-directory .tools-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .tools-directory .tool-card {
            font-weight: 400;
            display: flex;
            flex-direction: column;
            min-height: 210px;
            padding: 24px;
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: 16px;
            text-decoration: none;
            color: inherit;
            transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
        }
        .tools-directory .tool-card:hover {
            text-decoration: none;
            transform: translateY(-4px);
            border-color: var(--primary-light);
            box-shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
        }
        .tools-directory .tool-icon {
            width: 48px;
            height: 48px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 12px;
            background: var(--primary-soft);
            font-size: 25px;
            margin-bottom: 18px;
        }
        .tools-directory .tool-card h2 {
            border-bottom: 0;
            padding-bottom: 0;
            margin: 0 0 9px;
            font-size: 19px;
            color: var(--text);
        }
        .tools-directory .tool-card p {
            text-align: left;
            margin: 0;
            line-height: 1.6;
            color: var(--text-muted);
            font-size: 14px;
            flex: 1;
        }
        .tools-directory .open-tool {
            margin-top: 18px;
            color: var(--primary-light);
            font-weight: 600;
            font-size: 14px;
        }

        /* Developing */
        .tools-directory .tool-card.developing {
            position: relative;
        }
        .tools-directory .badge {
            position: absolute;
            top: 18px;
            right: 18px;
            padding: 5px 9px;
            border-radius: 999px;
            background: var(--surface-muted);
            color: var(--warning);
            font-size: 11px;
            font-weight: 600;
        }


.tools-directory .tool-card:focus-visible{outline:3px solid var(--primary-light);outline-offset:3px;}
@media(max-width:850px){.tools-directory .tools-grid{grid-template-columns:repeat(2,minmax(0,1fr));}}
@media(max-width:560px){.tools-directory{padding:24px 0 38px;}.tools-directory .hero{margin-bottom:30px;}.tools-directory .tools-grid{grid-template-columns:1fr;gap:14px;}.tools-directory .tool-card{min-height:auto;padding:20px;}}
@media(prefers-reduced-motion:reduce){.tools-directory .tool-card{transition:none;}.tools-directory .tool-card:hover{transform:none;}}

@media(max-width:560px){main.container:has(.tools-directory){margin:16px 0;padding:0 12px;}}