/* TechPulse — Máy tính online. Dùng token theme khi hợp lý, tự chứa phần còn lại. */
.mt-app {
	--mt-radius: 14px;
	--mt-key-radius: 12px;
	--mt-blue: #155bd6;
	--mt-blue-soft: #e9f0fd;
	--mt-red: #e8413a;
	--mt-line: var(--tp-line, #e6e5e1);
	--mt-surface: var(--tp-surface, #fff);
	--mt-soft: var(--tp-bg-soft, #f6f6f4);
	--mt-ink: var(--tp-ink, #0c0c0d);
	--mt-mute: var(--tp-ink-mute, #6c6c72);
	font-family: var(--tp-font-body, "IBM Plex Sans", system-ui, sans-serif);
	color: var(--mt-ink);
	max-width: 820px;
	margin: 0 auto;
}

/* ---- Tab chọn chế độ (3 skin) ---- */
.mt-tabs {
	display: flex; flex-wrap: wrap; gap: 8px;
	background: var(--mt-soft); border: 1px solid var(--mt-line);
	border-radius: 999px; padding: 6px; margin-bottom: 18px;
}
.mt-tab {
	flex: 1 1 auto; min-width: 120px; text-align: center;
	font: 600 .92rem/1 var(--tp-font-body, sans-serif);
	color: var(--mt-mute); background: transparent; border: 0;
	border-radius: 999px; padding: 11px 14px; cursor: pointer;
	transition: background .15s, color .15s;
}
.mt-tab:hover { color: var(--mt-ink); }
.mt-tab.is-active { background: var(--mt-blue); color: #fff; box-shadow: 0 4px 14px -4px rgba(21,91,214,.6); }

/* ---- Khung skin ---- */
.mt-skin { display: none; }
.mt-skin.is-active { display: block; }

/* ===================== MÁY KHOA HỌC ===================== */
.mt-card {
	background: var(--mt-surface); border: 1px solid var(--mt-line);
	border-radius: var(--mt-radius); box-shadow: var(--tp-shadow, 0 10px 30px -18px rgba(0,0,0,.3));
	overflow: hidden;
}
.mt-head {
	display: flex; align-items: center; justify-content: space-between;
	padding: 16px 20px; border-bottom: 1px solid var(--mt-line);
}
.mt-head h3 { margin: 0; font: 700 1.05rem/1.2 var(--tp-font-display, serif); }
.mt-angle {
	display: inline-flex; align-items: center; gap: 10px;
	font-weight: 700; font-size: .82rem; color: var(--mt-mute); cursor: pointer;
	background: transparent; border: 0;
}
.mt-angle .is-on { color: var(--mt-blue); }
.mt-angle-switch { width: 46px; height: 26px; border-radius: 999px; background: var(--mt-blue); position: relative; transition: background .2s; }
.mt-angle[data-angle="RAD"] .mt-angle-switch { background: #9aa0a6; }
.mt-angle-switch::after {
	content: ""; position: absolute; top: 3px; width: 20px; height: 20px; border-radius: 50%;
	background: #fff; transition: left .2s; left: 23px;
}
.mt-angle[data-angle="RAD"] .mt-angle-switch::after { left: 3px; }

/* Màn hình */
.mt-display {
	background: #1a1d23; color: #fff; padding: 22px 20px 18px;
	min-height: 112px; position: relative; display: flex; flex-direction: column;
	justify-content: flex-end; gap: 6px;
}
.mt-display .js-mt-expr {
	font: 600 2.1rem/1.15 var(--tp-font-mono, monospace);
	text-align: right; overflow-x: auto; white-space: nowrap; scrollbar-width: none;
}
.mt-display .js-mt-expr::-webkit-scrollbar { display: none; }
.mt-display .js-mt-prev {
	font: 500 1rem/1.2 var(--tp-font-mono, monospace);
	color: #8b93a3; text-align: right; min-height: 1.2em;
}
.mt-display .js-mt-mem {
	position: absolute; top: 14px; left: 18px; font-weight: 800; font-size: .8rem;
	color: #ffcf5b; visibility: hidden;
}
.js-mt-copy {
	position: absolute; top: 14px; right: 16px; width: 32px; height: 32px;
	display: flex; align-items: center; justify-content: center;
	background: rgba(255,255,255,.08); border: 0; border-radius: 8px; color: #c7ccd6;
	cursor: pointer; transition: background .15s, color .15s;
}
.js-mt-copy:hover { background: rgba(255,255,255,.16); color: #fff; }
.js-mt-copy.is-flash { background: var(--mt-blue); color: #fff; }

/* Sub-tab */
.mt-subtabs { display: flex; border-bottom: 1px solid var(--mt-line); }
.mt-subtab {
	flex: 1; text-align: center; padding: 14px 8px; cursor: pointer;
	background: transparent; border: 0; border-bottom: 2px solid transparent;
	font: 600 .92rem/1 var(--tp-font-body, sans-serif); color: var(--mt-mute);
}
.mt-subtab.is-active { color: var(--mt-blue); border-bottom-color: var(--mt-blue); }

/* Bàn phím */
.mt-pad { display: none; padding: 14px; gap: 8px; }
.mt-pad.is-active { display: grid; }
.mt-pad-main { grid-template-columns: repeat(4, 1fr); }
.mt-pad-mem  { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(6, 1fr); gap: 8px; margin-bottom: 2px; }
.mt-pad-sci, .mt-pad-adv { grid-template-columns: repeat(5, 1fr); }

.mt-key {
	font: 600 1.06rem/1 var(--tp-font-body, sans-serif);
	color: var(--mt-ink); background: var(--mt-surface);
	border: 1px solid var(--mt-line); border-radius: var(--mt-key-radius);
	padding: 16px 6px; cursor: pointer; user-select: none;
	transition: transform .05s, background .12s, border-color .12s, box-shadow .12s;
}
.mt-key:hover { background: var(--mt-soft); border-color: var(--tp-line-strong, #d6d5d0); }
.mt-key:active { transform: translateY(1px); }
.mt-key sup { font-size: .68em; }
.mt-key--fn { background: var(--mt-soft); font-size: .96rem; }
.mt-key--mem { background: var(--mt-soft); font-size: .9rem; padding: 12px 4px; color: var(--mt-mute); }
.mt-key--op { background: var(--mt-blue-soft); color: var(--mt-blue); font-weight: 700; }
.mt-key--op:hover { background: #dbe7fb; }
.mt-key--eq { background: var(--mt-blue); color: #fff; font-weight: 800; }
.mt-key--eq:hover { background: #1250bd; }
.mt-key--clear { background: var(--mt-red); color: #fff; font-weight: 800; }
.mt-key--clear:hover { background: #d4322b; }
.mt-key--span2 { grid-column: span 2; }

.mt-hint {
	display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 6px;
	padding: 6px 14px 16px; font-size: .8rem; color: var(--mt-mute);
}
.mt-hint kbd {
	font: 600 .76rem var(--tp-font-mono, monospace); background: var(--mt-soft);
	border: 1px solid var(--mt-line); border-radius: 5px; padding: 2px 7px; color: var(--mt-ink);
}

/* Lịch sử */
.mt-history-wrap { border-top: 1px solid var(--mt-line); }
.mt-history-head {
	display: flex; align-items: center; justify-content: space-between; padding: 14px 20px 8px;
}
.mt-history-head h4 { margin: 0; font: 700 .98rem/1 var(--tp-font-display, serif); }
.js-mt-clearhist { background: 0; border: 0; color: var(--mt-red); font-weight: 600; font-size: .88rem; cursor: pointer; }
.js-mt-history { display: flex; flex-direction: column; max-height: 280px; overflow-y: auto; padding: 0 14px 14px; }
.mt-history-empty { text-align: center; color: var(--mt-mute); padding: 26px; font-size: .92rem; }
.mt-history-item {
	display: flex; flex-direction: column; align-items: flex-end; gap: 2px;
	background: transparent; border: 0; border-bottom: 1px dashed var(--mt-line);
	padding: 10px 6px; cursor: pointer; text-align: right; width: 100%;
}
.mt-history-item:hover { background: var(--mt-soft); }
.mt-history-e { font: 500 .86rem var(--tp-font-mono, monospace); color: var(--mt-mute); word-break: break-all; }
.mt-history-r { font: 700 1.05rem var(--tp-font-mono, monospace); color: var(--mt-ink); }

/* ===================== SKIN CASIO ===================== */
.mt-casio-stage {
	background: var(--mt-soft); border: 1px solid var(--mt-line); border-radius: var(--mt-radius);
	padding: 30px 16px; display: flex; justify-content: center;
}
.mt-casio {
	width: 300px; max-width: 100%; border-radius: 16px; padding: 16px 14px 20px;
	font-family: Arial, "Helvetica Neue", sans-serif; box-shadow: 0 18px 40px -18px rgba(0,0,0,.55);
}
.mt-casio--580 { background: linear-gradient(180deg, #2a2a2c, #161617); }
.mt-casio--880 { background: linear-gradient(180deg, #20304a, #0e1a2c); }
.mt-casio-brand { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; }
.mt-casio-brand b { color: #fff; font-style: italic; font-weight: 800; letter-spacing: .5px; font-size: 1.05rem; }
.mt-casio-brand .cw { font-size: .7rem; font-weight: 700; letter-spacing: 1px; }
.mt-casio--580 .cw { color: #c77dff; }
.mt-casio--880 .cw { color: #5b95ff; }
.mt-casio-brand .mdl { margin-left: auto; color: #cfd3da; font-size: .72rem; font-weight: 600; }
.mt-casio-lcd {
	background: #b8c6a8; border: 2px solid #0c0c0c; border-radius: 4px;
	height: 92px; padding: 8px 10px; display: flex; flex-direction: column; justify-content: space-between;
	box-shadow: inset 0 2px 6px rgba(0,0,0,.25); margin-bottom: 14px;
}
.mt-casio-lcd .mt-lcd-status { font-size: .58rem; color: #2c3326; letter-spacing: 1px; }
.mt-casio-lcd .js-mt-expr { font: 600 .82rem/1.2 var(--tp-font-mono, monospace); color: #1f261a; text-align: left; overflow-x: auto; white-space: nowrap; scrollbar-width: none; }
.mt-casio-lcd .js-mt-expr::-webkit-scrollbar { display: none; }
.mt-casio-lcd .js-mt-prev { font: 700 1.35rem/1 var(--tp-font-mono, monospace); color: #11160d; text-align: right; }

.mt-casio-pad { display: grid; grid-template-columns: repeat(6, 1fr); gap: 6px 6px; }
.mt-casio-top { display: flex; align-items: center; justify-content: space-between; gap: 6px; margin-bottom: 10px; }
.mt-casio-top .grp { display: flex; gap: 10px; }
.mt-casio-ctl { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; margin-bottom: 8px; }
.mt-casio-ctl .mt-ckey { padding: 9px 2px; font-size: .72rem; }
.mt-casio-fn { display: grid; grid-template-columns: repeat(6, 1fr); gap: 6px; margin-bottom: 6px; }
.mt-casio-fn .mt-ckey { padding: 12px 1px 8px; font-size: .74rem; }
.mt-casio-num { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; }
.mt-casio-num .mt-ckey { padding: 13px 2px; font-size: .95rem; }
.mt-navpad {
	width: 58px; height: 58px; border-radius: 50%; background: #1c1c1e;
	color: #cfd3da; font-size: .7rem; display: grid; place-items: center; border: 2px solid #3a3a3d;
}
.mt-casio--880 .mt-navpad { background: #16233a; border-color: #2c3c57; }
.mt-ckey {
	position: relative; border: 0; border-radius: 6px; cursor: pointer;
	font-size: .82rem; font-weight: 700; padding: 11px 2px 9px; color: #f3f3f3;
	background: linear-gradient(180deg, #3a3a3d, #2a2a2c); box-shadow: 0 2px 0 rgba(0,0,0,.5);
	transition: transform .05s, filter .12s;
}
.mt-casio--880 .mt-ckey { background: linear-gradient(180deg, #2c3c57, #1b2942); }
.mt-ckey:hover { filter: brightness(1.15); }
.mt-ckey:active { transform: translateY(1px); }
.mt-ckey .sec { position: absolute; top: -13px; left: 0; right: 0; font-size: .54rem; font-weight: 700; color: #f0a23b; text-align: center; }
.mt-ckey .sec.blue { color: #6db3ff; }
.mt-ckey--num { background: linear-gradient(180deg, #f3f3f3, #dadada); color: #16181c; }
.mt-ckey--num:hover { filter: brightness(1.02); }
.mt-ckey--del { background: linear-gradient(180deg, #2f6fd6, #1d56b6); }
.mt-casio--880 .mt-ckey--del { background: linear-gradient(180deg, #e8702f, #c9531a); }
.mt-ckey--ac { background: linear-gradient(180deg, #2f6fd6, #1d56b6); }
.mt-casio--880 .mt-ckey--ac { background: linear-gradient(180deg, #d63b30, #b32b22); }
.mt-ckey--round { border-radius: 50%; width: 40px; height: 40px; padding: 0; margin: 0 auto; box-shadow: 0 2px 0 rgba(0,0,0,.5); }
.mt-ckey--shift { background: radial-gradient(circle at 35% 30%, #e8702f, #b8531c); }
.mt-ckey--alpha { background: radial-gradient(circle at 35% 30%, #2f6fd6, #1d56b6); }
.mt-ckey--gray { background: radial-gradient(circle at 35% 30%, #cfd3da, #9aa0a6); color: #1a1a1a; }
.mt-ckey--cosmetic { opacity: .92; cursor: default; }
.mt-ckey--cosmetic:active { transform: none; }
.mt-pad-nav { display: flex; flex-direction: column; align-items: center; gap: 2px; }
.mt-pad-nav .row { display: flex; gap: 22px; }
.mt-navpad {
	width: 70px; height: 70px; border-radius: 50%; background: #1c1c1e;
	display: grid; place-items: center; color: #cfd3da; font-size: .9rem;
	border: 2px solid #3a3a3d; position: relative;
}
.mt-casio--880 .mt-navpad { background: #16233a; border-color: #2c3c57; }

.mt-casio-note { text-align: center; color: var(--mt-mute); font-size: .82rem; margin-top: 14px; }

/* Dark mode tinh chỉnh */
[data-theme="dark"] .mt-display { background: #0a0b0d; }
[data-theme="dark"] .mt-key { background: var(--tp-surface); }

@media (max-width: 560px) {
	.mt-display .js-mt-expr { font-size: 1.7rem; }
	.mt-key { padding: 14px 4px; font-size: .98rem; }
	.mt-tab { min-width: 0; font-size: .82rem; padding: 10px 6px; }
}