/* =====================================================================
   Briefu — glassmorphism. Fire on graphite. Anta (display) + Inter (body).
   One stylesheet for the public site and the private app shell.
   ===================================================================== */

:root {
	/* brand */
	--fire:        #ff5c35;
	--fire-2:      #ff7d57;
	--ember:       #d8411d;
	--graphite:    #0a0a0a;
	--graphite-2:  #0c0c0e;

	/* ink */
	--ink:         #f5f4f1;
	--ink-soft:    #bdbcb6;
	--ink-faint:   #84837d;

	/* glass */
	--glass:       rgba(255,255,255,.055);
	--glass-2:     rgba(255,255,255,.018);
	--glass-strong:rgba(255,255,255,.085);
	--brd:         rgba(255,255,255,.10);
	--brd-strong:  rgba(255,255,255,.18);
	--hair:        rgba(255,255,255,.10);   /* inset top highlight */

	/* radii */
	--r:    18px;
	--r-lg: 26px;
	--r-sm: 12px;

	/* shadow + glow */
	--shadow:    0 18px 50px -22px rgba(0,0,0,.75);
	--shadow-sm: 0 10px 30px -18px rgba(0,0,0,.7);
	--glow:      0 24px 60px -18px rgba(255,92,53,.45);

	--maxw:  1480px;
	--gap:   clamp(14px, 1.6vw, 22px);
	--pad-x: clamp(18px, 4vw, 44px);

	--blur: saturate(155%) blur(18px);

	--font-disp: 'Anta', system-ui, sans-serif;
	--font-body: 'Inter', system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body.briefu {
	margin: 0;
	min-height: 100dvh;
	background: var(--graphite);
	color: var(--ink);
	font-family: var(--font-body);
	font-size: 16px;
	line-height: 1.6;
	-webkit-font-smoothing: antialiased;
	display: flex;
	flex-direction: column;
	position: relative;
	overflow-x: hidden;
}

/* Ambient orbs — fixed, blurred. Glass panels frost these. */
body.briefu::before {
	content: "";
	position: fixed;
	inset: -10vmax;
	z-index: -2;
	background:
		radial-gradient(46vmax 40vmax at 82% -8%,  rgba(255,92,53,.30),  transparent 60%),
		radial-gradient(38vmax 34vmax at 12% 8%,   rgba(216,65,29,.16),  transparent 62%),
		radial-gradient(50vmax 44vmax at 50% 118%, rgba(255,125,87,.14), transparent 60%),
		radial-gradient(36vmax 36vmax at -6% 86%,  rgba(70,84,120,.10),  transparent 62%);
	pointer-events: none;
}
/* Fine grain overlay for texture. */
body.briefu::after {
	content: "";
	position: fixed;
	inset: 0;
	z-index: -1;
	pointer-events: none;
	opacity: .035;
	background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

a { color: var(--fire); text-decoration: none; }
a:hover { color: var(--fire-2); }

::selection { background: rgba(255,92,53,.3); color: #fff; }

:focus-visible { outline: 2px solid var(--fire); outline-offset: 2px; border-radius: 4px; }

/* ---------------------------------------------------------------- layout */
.bu-wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--pad-x); }
.bu-site { flex: 1 0 auto; display: block; }

/* ---------------------------------------------------------------- type */
.bu-h1 {
	font-family: var(--font-disp); font-weight: 400;
	font-size: clamp(44px, 8vw, 92px);
	line-height: .98; letter-spacing: .5px; margin: 0 0 20px;
}
.bu-grad {
	background: linear-gradient(120deg, var(--fire-2), var(--fire) 45%, var(--ember));
	-webkit-background-clip: text; background-clip: text; color: transparent;
}
.bu-h2 {
	font-family: var(--font-disp); font-weight: 400;
	font-size: clamp(28px, 4.4vw, 50px);
	line-height: 1.06; letter-spacing: .4px; margin: 0 0 18px;
}
.bu-lede { font-size: clamp(17px, 2.1vw, 21px); color: var(--ink-soft); max-width: 54ch; margin: 0 0 30px; }
.bu-sub  { color: var(--ink-soft); font-size: clamp(16px, 2vw, 19px); max-width: 58ch; margin: 0 auto; }
.bu-narrow { max-width: 840px; }

.bu-eyebrow {
	display: inline-flex; align-items: center; gap: 9px;
	font-family: var(--font-disp); font-size: 13px; letter-spacing: 2.5px; text-transform: uppercase;
	color: var(--fire);
	padding: 8px 16px; border-radius: 999px;
	background: var(--glass); border: 1px solid rgba(255,92,53,.32);
	backdrop-filter: var(--blur); -webkit-backdrop-filter: var(--blur);
	box-shadow: inset 0 1px 0 var(--hair);
	margin-bottom: 24px;
}

/* ---------------------------------------------------------------- buttons
   THE FIX: inline-flex + centred on both axes. */
.bu-btn {
	display: inline-flex; align-items: center; justify-content: center; text-align: center;
	gap: 9px;
	height: 46px; padding: 0 22px;
	border-radius: 12px; border: 1px solid transparent;
	font-family: var(--font-body); font-weight: 600; font-size: 15px;
	line-height: 1; cursor: pointer; white-space: nowrap;
	transition: transform .12s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease, color .2s ease;
}
.bu-btn:hover { text-decoration: none; transform: translateY(-2px); }
.bu-btn:active { transform: translateY(0); }
.bu-btn--lg { height: 56px; padding: 0 30px; font-size: 16.5px; border-radius: 14px; }
.bu-btn--block { width: 100%; }

.bu-btn--primary {
	color: #1a0c07;
	background: linear-gradient(180deg, var(--fire-2), var(--fire));
	box-shadow: 0 14px 30px -10px rgba(255,92,53,.55), inset 0 1px 0 rgba(255,255,255,.4);
}
.bu-btn--primary:hover { box-shadow: 0 20px 44px -10px rgba(255,92,53,.7), inset 0 1px 0 rgba(255,255,255,.5); color: #1a0c07; }

.bu-btn--glass {
	color: var(--ink);
	background: var(--glass); border-color: var(--brd);
	backdrop-filter: var(--blur); -webkit-backdrop-filter: var(--blur);
	box-shadow: inset 0 1px 0 var(--hair);
}
.bu-btn--glass:hover { color: var(--fire-2); border-color: rgba(255,92,53,.5); background: var(--glass-strong); }

.bu-pill {
	display: inline-flex; align-items: center; justify-content: center;
	height: 42px; padding: 0 18px; border-radius: 12px; border: 0;
	background: linear-gradient(180deg, var(--fire-2), var(--fire)); color: #1a0c07;
	font-family: var(--font-body); font-weight: 700; font-size: 14px; cursor: pointer;
	box-shadow: 0 10px 24px -10px rgba(255,92,53,.6), inset 0 1px 0 rgba(255,255,255,.4);
	transition: transform .12s, box-shadow .2s;
}
.bu-pill:hover { transform: translateY(-2px); text-decoration: none; color: #1a0c07; box-shadow: 0 16px 32px -10px rgba(255,92,53,.75); }

/* ---------------------------------------------------------------- nav */
.bu-nav {
	position: sticky; top: 0; z-index: 50;
	background: rgba(10,10,10,.55);
	backdrop-filter: var(--blur); -webkit-backdrop-filter: var(--blur);
	border-bottom: 1px solid var(--brd);
}
.bu-nav__inner { display: flex; align-items: center; justify-content: space-between; height: 70px; }
.bu-nav__links { display: flex; align-items: center; gap: 6px; }
.bu-nav__links > a:not(.bu-pill) { color: var(--ink-soft); font-weight: 500; font-size: 15px; padding: 9px 14px; border-radius: 10px; transition: color .15s, background .15s; }
.bu-nav__links > a:not(.bu-pill):hover { color: var(--ink); background: var(--glass); }

.bu-brand { display: inline-flex; align-items: center; gap: 11px; color: var(--ink); font-family: var(--font-disp); font-size: 23px; letter-spacing: .5px; }
.bu-brand:hover { color: var(--ink); text-decoration: none; }
.bu-brand__mark { font-size: 23px; line-height: 1; color: var(--fire); filter: drop-shadow(0 2px 8px rgba(255,92,53,.5)); }
.bu-brand__name { font-weight: 400; }

.bu-skip { position: absolute; left: -9999px; top: 0; background: var(--fire); color: #160a06; padding: 10px 16px; border-radius: 0 0 10px 0; font-weight: 700; z-index: 100; }
.bu-skip:focus { left: 0; text-decoration: none; }

/* ---------------------------------------------------------------- hero */
.bu-hero { position: relative; padding-block: clamp(48px, 8vw, 120px); }
.bu-hero__inner { display: grid; gap: clamp(36px, 5vw, 64px); grid-template-columns: 1fr; align-items: center; }
.bu-hero__cta { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 22px; }
.bu-hero__phone { color: var(--ink-soft); font-weight: 600; display: flex; align-items: center; gap: 10px; margin: 0; }
.bu-hero__phone i { color: var(--fire); }
.bu-hero__phone a { color: var(--ink); }
.bu-hero__art { display: flex; justify-content: center; }

/* ---- phone signature ---- */
.bu-phonewrap { position: relative; padding: 30px 10px; }
.bu-phone__glow {
	position: absolute; inset: 8% 14%; z-index: 0;
	background: radial-gradient(closest-side, rgba(255,92,53,.55), transparent 72%);
	filter: blur(46px); border-radius: 50%;
}
.bu-phone {
	position: relative; z-index: 1;
	width: min(330px, 82vw);
	margin-inline: auto;
	background: linear-gradient(160deg, rgba(40,40,44,.9), rgba(14,14,16,.92));
	border: 1px solid var(--brd-strong);
	border-radius: 46px; padding: 12px;
	box-shadow: var(--shadow), 0 0 0 1px rgba(0,0,0,.6), inset 0 1px 0 rgba(255,255,255,.12);
	transform: perspective(1400px) rotateY(-11deg) rotateX(4deg);
	animation: bu-float 7s ease-in-out infinite;
}
.bu-showcase__art .bu-phone { transform: perspective(1400px) rotateY(10deg) rotateX(4deg); }
@keyframes bu-float { 0%,100% { translate: 0 0; } 50% { translate: 0 -12px; } }

.bu-phone__island { position: absolute; top: 20px; left: 50%; transform: translateX(-50%); width: 86px; height: 22px; background: #050506; border-radius: 999px; z-index: 3; box-shadow: inset 0 0 0 1px rgba(255,255,255,.06); }
.bu-phone__screen { background: linear-gradient(180deg, #0c0c0e, #070708); border-radius: 36px; padding: 38px 14px 18px; max-height: 580px; overflow: hidden; }
.bu-phone__bar { display: flex; align-items: center; gap: 9px; font-family: var(--font-disp); font-size: 19px; margin-bottom: 16px; }
.bu-phone__bar i { color: var(--fire); filter: drop-shadow(0 2px 6px rgba(255,92,53,.5)); }
.bu-phone__today { display: flex; gap: 6px; margin-bottom: 14px; flex-wrap: wrap; }
.bu-phone__today .bu-today__item { font-size: 11px; padding: 6px 10px; }
.bu-phone__label { font-family: var(--font-disp); font-size: 10px; letter-spacing: 2px; text-transform: uppercase; color: var(--ink-faint); margin: 16px 0 9px; }

/* floating push toast */
.bu-toast {
	position: absolute; top: 6px; right: -6px; z-index: 4;
	display: flex; align-items: center; gap: 11px;
	padding: 12px 16px; border-radius: 16px;
	background: rgba(20,20,22,.72); border: 1px solid var(--brd-strong);
	backdrop-filter: var(--blur); -webkit-backdrop-filter: var(--blur);
	box-shadow: var(--shadow), inset 0 1px 0 var(--hair);
	animation: bu-float 7s ease-in-out infinite; animation-delay: .6s;
}
.bu-toast i { font-size: 22px; color: var(--fire); filter: drop-shadow(0 2px 8px rgba(255,92,53,.55)); }
.bu-toast b { display: block; font-size: 13px; }
.bu-toast span { display: block; font-size: 12px; color: var(--ink-soft); }

/* mini cards (in mock) */
.bu-mini { background: linear-gradient(160deg, var(--glass-strong), var(--glass-2)); border: 1px solid var(--brd); border-radius: 14px; padding: 12px; margin-bottom: 10px; box-shadow: inset 0 1px 0 var(--hair); }
.bu-mini--reply { border-left: 2px solid var(--fire); }
.bu-mini__top { display: flex; justify-content: space-between; align-items: baseline; font-size: 13px; }
.bu-mini__top b { font-weight: 700; }
.bu-mini__top span { color: var(--ink-faint); font-size: 11px; }
.bu-mini__sub { font-size: 12.5px; font-weight: 600; margin: 5px 0; }
.bu-mini__sum { font-size: 12px; color: var(--ink-soft); line-height: 1.45; }
.bu-mini__draft { font-size: 11.5px; color: var(--ink-soft); background: rgba(0,0,0,.35); border: 1px solid var(--brd); border-radius: 9px; padding: 9px; margin-top: 9px; }
.bu-mini__act { display: flex; gap: 6px; margin-top: 11px; }
.bu-mini__btn { font-size: 11px; font-weight: 700; padding: 7px 13px; border-radius: 9px; background: var(--glass); border: 1px solid var(--brd); color: var(--ink); }
.bu-mini__btn--p { background: linear-gradient(180deg, var(--fire-2), var(--fire)); color: #1a0c07; border-color: transparent; }

/* ---------------------------------------------------------------- strip */
.bu-strip { padding-block: 6px; }
.bu-strip__inner {
	display: grid; grid-template-columns: repeat(2,1fr); gap: 2px;
	padding: 6px; border-radius: var(--r);
	background: linear-gradient(160deg, var(--glass), var(--glass-2));
	border: 1px solid var(--brd);
	backdrop-filter: var(--blur); -webkit-backdrop-filter: var(--blur);
	box-shadow: var(--shadow-sm), inset 0 1px 0 var(--hair);
}
.bu-strip__inner > div { display: flex; align-items: center; gap: 11px; color: var(--ink-soft); font-weight: 500; font-size: 14px; padding: 14px 16px; }
.bu-strip__inner i { color: var(--fire); font-size: 18px; }

/* ---------------------------------------------------------------- bands */
.bu-band { padding-block: clamp(56px, 8.5vw, 120px); position: relative; }
.bu-band--alt::before {
	content: ""; position: absolute; inset: 0; z-index: -1;
	background: linear-gradient(180deg, rgba(255,255,255,.02), transparent 30%, transparent 70%, rgba(255,255,255,.02));
	border-block: 1px solid var(--brd);
}
.bu-band--cta::before {
	content: ""; position: absolute; inset: 0; z-index: -1;
	background: radial-gradient(60vmax 30vmax at 20% 30%, rgba(255,92,53,.14), transparent 60%);
	border-top: 1px solid var(--brd);
}
.bu-band__head { text-align: center; max-width: 720px; margin: 0 auto clamp(34px, 4vw, 60px); }
.bu-band__head--left { text-align: left; margin-inline: 0; }
.bu-band > .bu-wrap > p, .bu-band .bu-narrow p { color: var(--ink-soft); font-size: clamp(16px, 1.8vw, 18px); line-height: 1.75; }
.bu-band .bu-narrow p + p { margin-top: 18px; }
.bu-band em { color: var(--ink); font-style: italic; }
.bu-band strong { color: var(--ink); font-weight: 600; }

/* shared glass surface for card-like blocks */
.bu-step, .bu-feature, .bu-faq__item, .bu-enquire__form {
	background: linear-gradient(160deg, var(--glass), var(--glass-2));
	border: 1px solid var(--brd);
	backdrop-filter: var(--blur); -webkit-backdrop-filter: var(--blur);
	box-shadow: var(--shadow-sm), inset 0 1px 0 var(--hair);
}

/* ---- steps ---- */
.bu-steps { display: grid; gap: var(--gap); grid-template-columns: 1fr; }
.bu-step { position: relative; border-radius: var(--r); padding: clamp(22px, 3vw, 30px); overflow: hidden; }
.bu-step__n { position: absolute; top: 14px; right: 22px; font-family: var(--font-disp); font-size: 46px; color: rgba(255,255,255,.06); }
.bu-step__icon { font-size: 28px; color: var(--fire); margin-bottom: 16px; display: block; filter: drop-shadow(0 4px 12px rgba(255,92,53,.4)); }
.bu-step h3 { font-size: 20px; margin: 0 0 9px; letter-spacing: .2px; }
.bu-step p { margin: 0; color: var(--ink-soft); font-size: 15.5px; }

/* ---- features ---- */
.bu-features { display: grid; gap: var(--gap); grid-template-columns: 1fr; }
.bu-feature { border-radius: var(--r); padding: clamp(22px, 2.6vw, 28px); transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease; }
.bu-feature:hover { transform: translateY(-4px); border-color: rgba(255,92,53,.4); box-shadow: var(--glow), inset 0 1px 0 var(--hair); }
.bu-feature__chip {
	display: inline-grid; place-items: center; width: 50px; height: 50px; border-radius: 14px;
	margin-bottom: 16px;
	background: radial-gradient(120% 120% at 30% 20%, rgba(255,92,53,.28), rgba(255,92,53,.06));
	border: 1px solid rgba(255,92,53,.32);
	box-shadow: inset 0 1px 0 rgba(255,255,255,.18);
}
.bu-feature__chip i { font-size: 21px; color: var(--fire-2); }
.bu-feature h3 { font-size: 18px; margin: 0 0 7px; }
.bu-feature p { margin: 0; font-size: 15px; color: var(--ink-soft); }

/* ---- showcase ---- */
.bu-showcase { display: grid; gap: clamp(32px, 5vw, 60px); grid-template-columns: 1fr; align-items: center; }
.bu-showcase__art { display: flex; justify-content: center; }
.bu-showcase p { color: var(--ink-soft); font-size: clamp(16px,1.8vw,18px); line-height: 1.75; }
.bu-ticks { list-style: none; padding: 0; margin: 24px 0 28px; display: grid; gap: 13px; }
.bu-ticks li { display: flex; align-items: center; gap: 12px; color: var(--ink-soft); font-size: 16.5px; }
.bu-ticks i { color: var(--fire); font-size: 18px; }

/* ---- faq ---- */
.bu-faq { display: grid; gap: 12px; }
.bu-faq__item { border-radius: var(--r-sm); padding: 2px 20px; transition: border-color .18s; }
.bu-faq__item[open] { border-color: rgba(255,92,53,.35); }
.bu-faq__item summary { list-style: none; cursor: pointer; display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 18px 0; font-weight: 600; font-size: 17px; }
.bu-faq__item summary::-webkit-details-marker { display: none; }
.bu-faq__item summary i { color: var(--fire); transition: transform .25s ease; flex: none; }
.bu-faq__item[open] summary i { transform: rotate(180deg); }
.bu-faq__a { padding: 0 0 20px; }
.bu-faq__a p { margin: 0; color: var(--ink-soft); line-height: 1.7; }

/* ---- enquire ---- */
.bu-enquire { display: grid; gap: clamp(32px, 5vw, 56px); grid-template-columns: 1fr; align-items: start; }
.bu-enquire__copy p { color: var(--ink-soft); font-size: 17px; line-height: 1.75; }
.bu-enquire__contacts { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 22px; }
.bu-enquire__contacts a { color: var(--ink); font-weight: 600; display: inline-flex; align-items: center; gap: 9px; }
.bu-enquire__contacts i { color: var(--fire); }
.bu-enquire__form { border-radius: var(--r-lg); padding: clamp(22px, 3vw, 34px); }
.bu-form { display: grid; gap: 16px; }
.bu-row { display: grid; gap: 16px; grid-template-columns: 1fr; }
.bu-field { display: grid; gap: 7px; }
.bu-field label { font-size: 14px; font-weight: 600; color: var(--ink-soft); }
.bu-field label span { color: var(--ink-faint); font-weight: 400; }
.bu-field input, .bu-field textarea {
	width: 100%; padding: 13px 15px; border-radius: var(--r-sm);
	background: rgba(0,0,0,.32); border: 1px solid var(--brd); color: var(--ink);
	font-family: var(--font-body); font-size: 15.5px; transition: border-color .15s, box-shadow .15s;
}
.bu-field input:focus, .bu-field textarea:focus { outline: none; border-color: rgba(255,92,53,.6); box-shadow: 0 0 0 3px rgba(255,92,53,.18); }
.bu-field textarea { resize: vertical; min-height: 110px; }
.bu-hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

.bu-alert { display: flex; align-items: center; gap: 11px; padding: 14px 16px; border-radius: var(--r-sm); margin-bottom: 18px; font-weight: 500; }
.bu-alert i { font-size: 18px; }
.bu-alert--ok { background: rgba(46,160,67,.12); border: 1px solid rgba(46,160,67,.45); color: #84e3a0; }
.bu-alert--err { background: rgba(255,92,53,.12); border: 1px solid rgba(255,92,53,.45); color: var(--fire-2); }

/* ---- prose (fallback pages) ---- */
.bu-prose { padding-block: clamp(48px, 7vw, 84px); max-width: 760px; }
.bu-prose h1 { font-family: var(--font-disp); font-weight: 400; font-size: clamp(32px,5vw,52px); margin: 0 0 22px; }
.bu-prose p { color: var(--ink-soft); margin: 0 0 16px; }

/* ---------------------------------------------------------------- footer */
.bu-sitefoot { margin-top: auto; border-top: 1px solid var(--brd); background: rgba(255,255,255,.014); padding-top: clamp(44px, 6vw, 70px); backdrop-filter: var(--blur); -webkit-backdrop-filter: var(--blur); }
.bu-sitefoot__grid { display: grid; gap: 34px; grid-template-columns: 1fr; padding-bottom: 38px; }
.bu-sitefoot__brand p { color: var(--ink-soft); font-size: 15px; max-width: 42ch; margin: 16px 0 0; line-height: 1.7; }
.bu-sitefoot__col h3 { font-family: var(--font-disp); font-weight: 400; font-size: 14px; letter-spacing: 2px; text-transform: uppercase; color: var(--ink-faint); margin: 0 0 14px; }
.bu-sitefoot__col a { display: flex; align-items: center; gap: 10px; color: var(--ink-soft); padding: 6px 0; font-size: 15px; transition: color .15s; }
.bu-sitefoot__col a:hover { color: var(--fire-2); }
.bu-sitefoot__col i { color: var(--fire); width: 16px; text-align: center; }
.bu-sitefoot__legal { display: flex; flex-wrap: wrap; gap: 10px 22px; justify-content: space-between; align-items: center; border-top: 1px solid var(--brd); padding-block: 24px; font-size: 13.5px; color: var(--ink-faint); }
.bu-credit a { color: var(--ink-soft); }
.bu-credit a:hover { color: var(--fire-2); }

/* ---------------------------------------------------------------- reveal */
[data-reveal] { opacity: 0; transform: translateY(22px); transition: opacity .7s ease, transform .7s cubic-bezier(.2,.7,.2,1); }
[data-reveal].is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
	[data-reveal] { opacity: 1 !important; transform: none !important; transition: none; }
	.bu-phone, .bu-toast { animation: none; }
}

/* =====================================================================
   PRIVATE APP SHELL (/app)
   ===================================================================== */
.bu-top {
	position: sticky; top: 0; z-index: 30;
	background: rgba(10,10,10,.6); backdrop-filter: var(--blur); -webkit-backdrop-filter: var(--blur);
	border-bottom: 1px solid var(--brd); padding-top: env(safe-area-inset-top);
}
.bu-top__inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.bu-top__actions { display: flex; align-items: center; gap: 8px; }
.bu-iconbtn { display: inline-grid; place-items: center; width: 42px; height: 42px; border-radius: 12px; border: 1px solid var(--brd); background: var(--glass); color: var(--ink-soft); cursor: pointer; transition: color .15s, border-color .15s, transform .1s; }
.bu-iconbtn:hover { color: var(--ink); border-color: var(--brd-strong); }
.bu-iconbtn:active { transform: scale(.95); }
.bu-iconbtn i { font-size: 18px; }

.bu-main { flex: 1 0 auto; padding-block: clamp(18px, 3vw, 36px); padding-bottom: max(28px, env(safe-area-inset-bottom)); }
.bu-app { width: 100%; }
.bu-grid { display: grid; gap: var(--gap); grid-template-columns: 1fr; }

.bu-card { background: linear-gradient(160deg, var(--glass), var(--glass-2)); border: 1px solid var(--brd); border-radius: var(--r); padding: clamp(15px, 2.4vw, 20px); backdrop-filter: var(--blur); -webkit-backdrop-filter: var(--blur); box-shadow: var(--shadow-sm), inset 0 1px 0 var(--hair); }
.bu-card--reply { border-left: 2px solid var(--fire); }
.bu-card__head { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; margin-bottom: 8px; }
.bu-card__from { font-weight: 600; }
.bu-card__time { color: var(--ink-faint); font-size: 13px; white-space: nowrap; }
.bu-card__subject { font-weight: 600; margin: 2px 0 6px; }
.bu-card__summary { color: var(--ink-soft); margin: 0 0 12px; }
.bu-section-title { font-family: var(--font-disp); font-weight: 400; font-size: 13px; letter-spacing: 2px; text-transform: uppercase; color: var(--ink-faint); margin: clamp(20px,3vw,30px) 0 12px; }
.bu-textarea { width: 100%; min-height: 96px; resize: vertical; background: rgba(0,0,0,.32); border: 1px solid var(--brd); border-radius: var(--r-sm); color: var(--ink); font-family: var(--font-body); font-size: 15px; line-height: 1.5; padding: 12px; }
.bu-textarea:focus { outline: none; border-color: rgba(255,92,53,.6); box-shadow: 0 0 0 3px rgba(255,92,53,.18); }
.bu-actions { display: flex; gap: 8px; margin-top: 12px; flex-wrap: wrap; }

.bu-today { display: flex; gap: 8px; overflow-x: auto; padding-bottom: 4px; margin-bottom: 8px; scrollbar-width: thin; }
.bu-today__item { flex: 0 0 auto; background: var(--glass); border: 1px solid var(--brd); border-radius: 999px; padding: 8px 14px; font-size: 14px; color: var(--ink-soft); }
.bu-today__item b { color: var(--ink); font-weight: 600; }

.bu-chip { display: inline-flex; align-items: center; padding: 7px 13px; border-radius: 999px; border: 1px solid var(--brd); background: var(--glass); color: var(--ink-soft); font-size: 13px; font-weight: 500; }

.bu-empty { max-width: 560px; margin: clamp(40px,9vw,110px) auto; text-align: center; padding: var(--gap); }
.bu-empty__mark { display: block; font-size: 76px; line-height: 1; margin: 0 auto 24px; color: var(--fire); filter: drop-shadow(0 10px 30px rgba(255,92,53,.45)); }
.bu-empty__title { font-family: var(--font-disp); font-weight: 400; font-size: clamp(30px,6vw,42px); letter-spacing: .5px; margin: 0 0 12px; }
.bu-empty__text { color: var(--ink-soft); margin: 0 auto 24px; max-width: 42ch; }
.bu-empty__chips { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }

.bu-foot { flex-shrink: 0; border-top: 1px solid var(--brd); color: var(--ink-faint); font-size: 13px; padding-bottom: env(safe-area-inset-bottom); }
.bu-foot__inner { display: flex; align-items: center; justify-content: space-between; height: 56px; }
.bu-foot__by { color: var(--ink-soft); }

/* =====================================================================
   RESPONSIVE
   ===================================================================== */
@media (max-width: 600px) {
	.bu-nav__links > a:not(.bu-pill) { display: none; }
}
@media (min-width: 720px) {
	.bu-strip__inner { grid-template-columns: repeat(4,1fr); }
	.bu-steps    { grid-template-columns: repeat(2,1fr); }
	.bu-features { grid-template-columns: repeat(2,1fr); }
	.bu-row      { grid-template-columns: 1fr 1fr; }
	.bu-grid     { grid-template-columns: repeat(2,1fr); }
	.bu-sitefoot__grid { grid-template-columns: 2fr 1fr 1fr; }
}
@media (min-width: 1024px) {
	.bu-hero__inner { grid-template-columns: 1.05fr .95fr; }
	.bu-steps    { grid-template-columns: repeat(4,1fr); }
	.bu-features { grid-template-columns: repeat(4,1fr); }
	.bu-showcase { grid-template-columns: 1fr 1fr; }
	.bu-enquire  { grid-template-columns: 1fr 1.1fr; }
}
@media (min-width: 1600px) {
	:root { --maxw: 1480px; }
	.bu-grid { grid-template-columns: repeat(3,1fr); }
}
@media (min-width: 2200px) {
	:root { --maxw: 1640px; }
	body.briefu { font-size: 17px; }
}

/* No-backdrop-filter fallback: make glass solid enough to read. */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
	.bu-nav, .bu-top { background: rgba(14,14,16,.96); }
	.bu-step, .bu-feature, .bu-faq__item, .bu-enquire__form, .bu-card, .bu-strip__inner, .bu-eyebrow, .bu-btn--glass, .bu-toast {
		background: #15151a;
	}
}

@media (max-width: 520px) { .bu-toast { display: none; } }