/* Nền hoa văn mặc định cho mọi khung chat, nét mảnh theo màu chủ đạo của theme (tạo bằng scripts/build-chat-pattern.mjs) */
:root { --chat-pattern: url("data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22260%22%20height%3D%22260%22%20viewBox%3D%220%200%20260%20260%22%20fill%3D%22none%22%20stroke%3D%22%23d4a937%22%20stroke-opacity%3D%220.13%22%20stroke-width%3D%221.6%22%20stroke-linecap%3D%22round%22%20stroke-linejoin%3D%22round%22%3E%20%3Cpath%20d%3D%22M22%2030v26M22%2034h-4v14h8V34zM34%2024v30M34%2030h-4v12h8V30z%22%2F%3E%20%3Ccircle%20cx%3D%2278%22%20cy%3D%2228%22%20r%3D%2211%22%2F%3E%3Cpath%20d%3D%22M78%2021v14M74%2024.5c0-2%208-2%208%201s-8%202-8%205%208%203%208%200%22%2F%3E%20%3Cpath%20d%3D%22M120%2020l2.5%206%206.5.5-5%204.2%201.6%206.3-5.6-3.4-5.6%203.4%201.6-6.3-5-4.2%206.5-.5z%22%2F%3E%20%3Cpath%20d%3D%22M170%2036c-6-5-12-9-12-15a6%206%200%200112%200%206%206%200%200112%200c0%206-6%2010-12%2015z%22%2F%3E%20%3Cpath%20d%3D%22M212%2040l10-10%208%206%2014-16M236%2020h8v8%22%2F%3E%20%3Cpath%20d%3D%22M18%2092l34-14-12%2032-7-10z%20M33%20100l7-22%22%2F%3E%20%3Cpath%20d%3D%22M78%2084h18v14a8%208%200%2001-8%208h-2a8%208%200%2001-8-8zM96%2088h4a4%204%200%20010%208h-4M82%2076c0-3%203-3%203-6M90%2076c0-3%203-3%203-6%22%2F%3E%20%3Crect%20x%3D%22122%22%20y%3D%2280%22%20width%3D%2228%22%20height%3D%2220%22%20rx%3D%223%22%2F%3E%3Cpath%20d%3D%22M122%2082l14%2010%2014-10%22%2F%3E%20%3Cpath%20d%3D%22M186%2076l2%205%205%202-5%202-2%205-2-5-5-2%205-2z%20M200%2098l1%203%203%201-3%201-1%203-1-3-3-1%203-1z%22%2F%3E%20%3Cpath%20d%3D%22M238%2074a14%2014%200%201010%2024%2011%2011%200%2001-10-24z%22%2F%3E%20%3Crect%20x%3D%2216%22%20y%3D%22140%22%20width%3D%2226%22%20height%3D%2220%22%20rx%3D%222%22%2F%3E%3Cpath%20d%3D%22M14%20140h30v-6H14zM29%20134v26M29%20134c-6-8-12-4-8%200M29%20134c6-8%2012-4%208%200%22%2F%3E%20%3Cpath%20d%3D%22M66%20136h30a6%206%200%20016%206v12a6%206%200%2001-6%206H80l-8%206v-6h-6a6%206%200%2001-6-6v-12a6%206%200%20016-6z%20M72%20148h18%22%2F%3E%20%3Cpath%20d%3D%22M132%20168c10-4%2014-16%2010-28-12%202-20%2012-18%2024M124%20170l12-16%22%2F%3E%20%3Ccircle%20cx%3D%22182%22%20cy%3D%22150%22%20r%3D%2213%22%2F%3E%3Cpath%20d%3D%22M182%20141v9l6%204%22%2F%3E%20%3Cpath%20d%3D%22M226%20134v34M226%20140h-5v18h10v-18zM242%20146v22M242%20150h-5v10h10v-10z%22%2F%3E%20%3Cpath%20d%3D%22M22%20206c8%200%208-10%2016-10s8%2010%2016%2010%208-10%2016-10%22%2F%3E%20%3Cpath%20d%3D%22M98%20196l14%2022h-28z%20M98%20204v6M98%20213v1%22%2F%3E%20%3Crect%20x%3D%22138%22%20y%3D%22196%22%20width%3D%2222%22%20height%3D%2222%22%20rx%3D%224%22%2F%3E%3Cpath%20d%3D%22M144%20196v-4h10v4M149%20204v8M145%20208h8%22%2F%3E%20%3Cpath%20d%3D%22M190%20214c0-12%206-18%2014-18s14%206%2014%2018zM196%20214v6M212%20214v6M204%20196v-6%22%2F%3E%20%3Cpath%20d%3D%22M246%20196l3%206%206%201-4.5%204%201%206-5.5-3-5.5%203%201-6-4.5-4%206-1z%22%2F%3E%20%3Cpath%20d%3D%22M60%20238h20M70%20228v20%20M160%20240c4-6%2012-6%2016%200%22%2F%3E%20%3C%2Fsvg%3E"); }
:root[data-theme="noir"] { --chat-pattern: url("data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22260%22%20height%3D%22260%22%20viewBox%3D%220%200%20260%20260%22%20fill%3D%22none%22%20stroke%3D%22%23d4a937%22%20stroke-opacity%3D%220.13%22%20stroke-width%3D%221.6%22%20stroke-linecap%3D%22round%22%20stroke-linejoin%3D%22round%22%3E%20%3Cpath%20d%3D%22M22%2030v26M22%2034h-4v14h8V34zM34%2024v30M34%2030h-4v12h8V30z%22%2F%3E%20%3Ccircle%20cx%3D%2278%22%20cy%3D%2228%22%20r%3D%2211%22%2F%3E%3Cpath%20d%3D%22M78%2021v14M74%2024.5c0-2%208-2%208%201s-8%202-8%205%208%203%208%200%22%2F%3E%20%3Cpath%20d%3D%22M120%2020l2.5%206%206.5.5-5%204.2%201.6%206.3-5.6-3.4-5.6%203.4%201.6-6.3-5-4.2%206.5-.5z%22%2F%3E%20%3Cpath%20d%3D%22M170%2036c-6-5-12-9-12-15a6%206%200%200112%200%206%206%200%200112%200c0%206-6%2010-12%2015z%22%2F%3E%20%3Cpath%20d%3D%22M212%2040l10-10%208%206%2014-16M236%2020h8v8%22%2F%3E%20%3Cpath%20d%3D%22M18%2092l34-14-12%2032-7-10z%20M33%20100l7-22%22%2F%3E%20%3Cpath%20d%3D%22M78%2084h18v14a8%208%200%2001-8%208h-2a8%208%200%2001-8-8zM96%2088h4a4%204%200%20010%208h-4M82%2076c0-3%203-3%203-6M90%2076c0-3%203-3%203-6%22%2F%3E%20%3Crect%20x%3D%22122%22%20y%3D%2280%22%20width%3D%2228%22%20height%3D%2220%22%20rx%3D%223%22%2F%3E%3Cpath%20d%3D%22M122%2082l14%2010%2014-10%22%2F%3E%20%3Cpath%20d%3D%22M186%2076l2%205%205%202-5%202-2%205-2-5-5-2%205-2z%20M200%2098l1%203%203%201-3%201-1%203-1-3-3-1%203-1z%22%2F%3E%20%3Cpath%20d%3D%22M238%2074a14%2014%200%201010%2024%2011%2011%200%2001-10-24z%22%2F%3E%20%3Crect%20x%3D%2216%22%20y%3D%22140%22%20width%3D%2226%22%20height%3D%2220%22%20rx%3D%222%22%2F%3E%3Cpath%20d%3D%22M14%20140h30v-6H14zM29%20134v26M29%20134c-6-8-12-4-8%200M29%20134c6-8%2012-4%208%200%22%2F%3E%20%3Cpath%20d%3D%22M66%20136h30a6%206%200%20016%206v12a6%206%200%2001-6%206H80l-8%206v-6h-6a6%206%200%2001-6-6v-12a6%206%200%20016-6z%20M72%20148h18%22%2F%3E%20%3Cpath%20d%3D%22M132%20168c10-4%2014-16%2010-28-12%202-20%2012-18%2024M124%20170l12-16%22%2F%3E%20%3Ccircle%20cx%3D%22182%22%20cy%3D%22150%22%20r%3D%2213%22%2F%3E%3Cpath%20d%3D%22M182%20141v9l6%204%22%2F%3E%20%3Cpath%20d%3D%22M226%20134v34M226%20140h-5v18h10v-18zM242%20146v22M242%20150h-5v10h10v-10z%22%2F%3E%20%3Cpath%20d%3D%22M22%20206c8%200%208-10%2016-10s8%2010%2016%2010%208-10%2016-10%22%2F%3E%20%3Cpath%20d%3D%22M98%20196l14%2022h-28z%20M98%20204v6M98%20213v1%22%2F%3E%20%3Crect%20x%3D%22138%22%20y%3D%22196%22%20width%3D%2222%22%20height%3D%2222%22%20rx%3D%224%22%2F%3E%3Cpath%20d%3D%22M144%20196v-4h10v4M149%20204v8M145%20208h8%22%2F%3E%20%3Cpath%20d%3D%22M190%20214c0-12%206-18%2014-18s14%206%2014%2018zM196%20214v6M212%20214v6M204%20196v-6%22%2F%3E%20%3Cpath%20d%3D%22M246%20196l3%206%206%201-4.5%204%201%206-5.5-3-5.5%203%201-6-4.5-4%206-1z%22%2F%3E%20%3Cpath%20d%3D%22M60%20238h20M70%20228v20%20M160%20240c4-6%2012-6%2016%200%22%2F%3E%20%3C%2Fsvg%3E"); }
:root[data-theme="dark"] { --chat-pattern: url("data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22260%22%20height%3D%22260%22%20viewBox%3D%220%200%20260%20260%22%20fill%3D%22none%22%20stroke%3D%22%2320c997%22%20stroke-opacity%3D%220.11%22%20stroke-width%3D%221.6%22%20stroke-linecap%3D%22round%22%20stroke-linejoin%3D%22round%22%3E%20%3Cpath%20d%3D%22M22%2030v26M22%2034h-4v14h8V34zM34%2024v30M34%2030h-4v12h8V30z%22%2F%3E%20%3Ccircle%20cx%3D%2278%22%20cy%3D%2228%22%20r%3D%2211%22%2F%3E%3Cpath%20d%3D%22M78%2021v14M74%2024.5c0-2%208-2%208%201s-8%202-8%205%208%203%208%200%22%2F%3E%20%3Cpath%20d%3D%22M120%2020l2.5%206%206.5.5-5%204.2%201.6%206.3-5.6-3.4-5.6%203.4%201.6-6.3-5-4.2%206.5-.5z%22%2F%3E%20%3Cpath%20d%3D%22M170%2036c-6-5-12-9-12-15a6%206%200%200112%200%206%206%200%200112%200c0%206-6%2010-12%2015z%22%2F%3E%20%3Cpath%20d%3D%22M212%2040l10-10%208%206%2014-16M236%2020h8v8%22%2F%3E%20%3Cpath%20d%3D%22M18%2092l34-14-12%2032-7-10z%20M33%20100l7-22%22%2F%3E%20%3Cpath%20d%3D%22M78%2084h18v14a8%208%200%2001-8%208h-2a8%208%200%2001-8-8zM96%2088h4a4%204%200%20010%208h-4M82%2076c0-3%203-3%203-6M90%2076c0-3%203-3%203-6%22%2F%3E%20%3Crect%20x%3D%22122%22%20y%3D%2280%22%20width%3D%2228%22%20height%3D%2220%22%20rx%3D%223%22%2F%3E%3Cpath%20d%3D%22M122%2082l14%2010%2014-10%22%2F%3E%20%3Cpath%20d%3D%22M186%2076l2%205%205%202-5%202-2%205-2-5-5-2%205-2z%20M200%2098l1%203%203%201-3%201-1%203-1-3-3-1%203-1z%22%2F%3E%20%3Cpath%20d%3D%22M238%2074a14%2014%200%201010%2024%2011%2011%200%2001-10-24z%22%2F%3E%20%3Crect%20x%3D%2216%22%20y%3D%22140%22%20width%3D%2226%22%20height%3D%2220%22%20rx%3D%222%22%2F%3E%3Cpath%20d%3D%22M14%20140h30v-6H14zM29%20134v26M29%20134c-6-8-12-4-8%200M29%20134c6-8%2012-4%208%200%22%2F%3E%20%3Cpath%20d%3D%22M66%20136h30a6%206%200%20016%206v12a6%206%200%2001-6%206H80l-8%206v-6h-6a6%206%200%2001-6-6v-12a6%206%200%20016-6z%20M72%20148h18%22%2F%3E%20%3Cpath%20d%3D%22M132%20168c10-4%2014-16%2010-28-12%202-20%2012-18%2024M124%20170l12-16%22%2F%3E%20%3Ccircle%20cx%3D%22182%22%20cy%3D%22150%22%20r%3D%2213%22%2F%3E%3Cpath%20d%3D%22M182%20141v9l6%204%22%2F%3E%20%3Cpath%20d%3D%22M226%20134v34M226%20140h-5v18h10v-18zM242%20146v22M242%20150h-5v10h10v-10z%22%2F%3E%20%3Cpath%20d%3D%22M22%20206c8%200%208-10%2016-10s8%2010%2016%2010%208-10%2016-10%22%2F%3E%20%3Cpath%20d%3D%22M98%20196l14%2022h-28z%20M98%20204v6M98%20213v1%22%2F%3E%20%3Crect%20x%3D%22138%22%20y%3D%22196%22%20width%3D%2222%22%20height%3D%2222%22%20rx%3D%224%22%2F%3E%3Cpath%20d%3D%22M144%20196v-4h10v4M149%20204v8M145%20208h8%22%2F%3E%20%3Cpath%20d%3D%22M190%20214c0-12%206-18%2014-18s14%206%2014%2018zM196%20214v6M212%20214v6M204%20196v-6%22%2F%3E%20%3Cpath%20d%3D%22M246%20196l3%206%206%201-4.5%204%201%206-5.5-3-5.5%203%201-6-4.5-4%206-1z%22%2F%3E%20%3Cpath%20d%3D%22M60%20238h20M70%20228v20%20M160%20240c4-6%2012-6%2016%200%22%2F%3E%20%3C%2Fsvg%3E"); }
:root[data-theme="sapphire"] { --chat-pattern: url("data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22260%22%20height%3D%22260%22%20viewBox%3D%220%200%20260%20260%22%20fill%3D%22none%22%20stroke%3D%22%233b82f6%22%20stroke-opacity%3D%220.13%22%20stroke-width%3D%221.6%22%20stroke-linecap%3D%22round%22%20stroke-linejoin%3D%22round%22%3E%20%3Cpath%20d%3D%22M22%2030v26M22%2034h-4v14h8V34zM34%2024v30M34%2030h-4v12h8V30z%22%2F%3E%20%3Ccircle%20cx%3D%2278%22%20cy%3D%2228%22%20r%3D%2211%22%2F%3E%3Cpath%20d%3D%22M78%2021v14M74%2024.5c0-2%208-2%208%201s-8%202-8%205%208%203%208%200%22%2F%3E%20%3Cpath%20d%3D%22M120%2020l2.5%206%206.5.5-5%204.2%201.6%206.3-5.6-3.4-5.6%203.4%201.6-6.3-5-4.2%206.5-.5z%22%2F%3E%20%3Cpath%20d%3D%22M170%2036c-6-5-12-9-12-15a6%206%200%200112%200%206%206%200%200112%200c0%206-6%2010-12%2015z%22%2F%3E%20%3Cpath%20d%3D%22M212%2040l10-10%208%206%2014-16M236%2020h8v8%22%2F%3E%20%3Cpath%20d%3D%22M18%2092l34-14-12%2032-7-10z%20M33%20100l7-22%22%2F%3E%20%3Cpath%20d%3D%22M78%2084h18v14a8%208%200%2001-8%208h-2a8%208%200%2001-8-8zM96%2088h4a4%204%200%20010%208h-4M82%2076c0-3%203-3%203-6M90%2076c0-3%203-3%203-6%22%2F%3E%20%3Crect%20x%3D%22122%22%20y%3D%2280%22%20width%3D%2228%22%20height%3D%2220%22%20rx%3D%223%22%2F%3E%3Cpath%20d%3D%22M122%2082l14%2010%2014-10%22%2F%3E%20%3Cpath%20d%3D%22M186%2076l2%205%205%202-5%202-2%205-2-5-5-2%205-2z%20M200%2098l1%203%203%201-3%201-1%203-1-3-3-1%203-1z%22%2F%3E%20%3Cpath%20d%3D%22M238%2074a14%2014%200%201010%2024%2011%2011%200%2001-10-24z%22%2F%3E%20%3Crect%20x%3D%2216%22%20y%3D%22140%22%20width%3D%2226%22%20height%3D%2220%22%20rx%3D%222%22%2F%3E%3Cpath%20d%3D%22M14%20140h30v-6H14zM29%20134v26M29%20134c-6-8-12-4-8%200M29%20134c6-8%2012-4%208%200%22%2F%3E%20%3Cpath%20d%3D%22M66%20136h30a6%206%200%20016%206v12a6%206%200%2001-6%206H80l-8%206v-6h-6a6%206%200%2001-6-6v-12a6%206%200%20016-6z%20M72%20148h18%22%2F%3E%20%3Cpath%20d%3D%22M132%20168c10-4%2014-16%2010-28-12%202-20%2012-18%2024M124%20170l12-16%22%2F%3E%20%3Ccircle%20cx%3D%22182%22%20cy%3D%22150%22%20r%3D%2213%22%2F%3E%3Cpath%20d%3D%22M182%20141v9l6%204%22%2F%3E%20%3Cpath%20d%3D%22M226%20134v34M226%20140h-5v18h10v-18zM242%20146v22M242%20150h-5v10h10v-10z%22%2F%3E%20%3Cpath%20d%3D%22M22%20206c8%200%208-10%2016-10s8%2010%2016%2010%208-10%2016-10%22%2F%3E%20%3Cpath%20d%3D%22M98%20196l14%2022h-28z%20M98%20204v6M98%20213v1%22%2F%3E%20%3Crect%20x%3D%22138%22%20y%3D%22196%22%20width%3D%2222%22%20height%3D%2222%22%20rx%3D%224%22%2F%3E%3Cpath%20d%3D%22M144%20196v-4h10v4M149%20204v8M145%20208h8%22%2F%3E%20%3Cpath%20d%3D%22M190%20214c0-12%206-18%2014-18s14%206%2014%2018zM196%20214v6M212%20214v6M204%20196v-6%22%2F%3E%20%3Cpath%20d%3D%22M246%20196l3%206%206%201-4.5%204%201%206-5.5-3-5.5%203%201-6-4.5-4%206-1z%22%2F%3E%20%3Cpath%20d%3D%22M60%20238h20M70%20228v20%20M160%20240c4-6%2012-6%2016%200%22%2F%3E%20%3C%2Fsvg%3E"); }
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