:root {
	--bg: #0b0c10;
	--panel: #11131a;
	--muted: #9aa3b2;
	--text: #e7ecf3;
	--primary: #6aa6ff;
	--primary-600: #3f83ff;
	--success: #36d399;
	--warning: #ffd166;
	--danger: #ff6b6b;
	--border: #1e2230;
	--radius: 14px;
	--shadow: 0 10px 30px rgba(0,0,0,0.35);
	/* glass */
	--glass-bg: rgba(17,19,26,0.55);
	--glass-bg-raised: rgba(17,19,26,0.65);
	--glass-border: rgba(255,255,255,0.06);
	--glass-border-strong: rgba(255,255,255,0.12);
	--glass-highlight: linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.02));
	--glass-blur: 14px;
	--ring-primary: rgba(106,166,255,0.35);
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
	margin: 0;
	font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
	background: radial-gradient(1200px 700px at 20% -10%, #15192a 0%, var(--bg) 60%), linear-gradient(180deg, #0a0b11 0%, #0b0c10 100%);
	color: var(--text);
	background-attachment: fixed;
	overflow-x: hidden;
}

/* decorative background orbs */
.bg-decor {
	position: fixed;
	inset: 0;
	z-index: 0;
	pointer-events: none;
}
.orb {
	position: absolute;
	border-radius: 9999px;
	filter: blur(40px);
	opacity: 0.45;
}
.orb-1 { width: 520px; height: 520px; left: -140px; top: -160px; background: radial-gradient(closest-side, rgba(90,140,255,0.7), rgba(90,140,255,0)); }
.orb-2 { width: 420px; height: 420px; right: -120px; top: 30vh; background: radial-gradient(closest-side, rgba(55,220,160,0.5), rgba(55,220,160,0)); }
.orb-3 { width: 580px; height: 580px; left: 30vw; bottom: -220px; background: radial-gradient(closest-side, rgba(255,130,180,0.35), rgba(255,130,180,0)); }

.app-header {
	position: sticky;
	top: 0;
	z-index: 10;
	display: flex;
	align-items: center;
	justify-content: space-between;
	padding: 18px 22px;
	border-bottom: 1px solid var(--border);
	backdrop-filter: saturate(1.2) blur(var(--glass-blur));
	background: var(--glass-bg);
}

.title-wrap h1 {
	margin: 0 0 4px 0;
	font-size: 22px;
	font-weight: 700;
}

.subtitle {
	margin: 0;
	color: var(--muted);
	font-size: 13px;
}

.header-actions { display: flex; gap: 10px; }

.app-main {
	display: grid;
	grid-template-columns: 300px 1fr;
	gap: 20px;
	padding: 20px;
	max-width: 1200px;
	margin: 0 auto;
	position: relative;
	z-index: 1;
}

.sidebar {
	position: sticky;
	top: 74px;
	height: calc(100vh - 74px);
	overflow: auto;
	padding-right: 6px;
}

.step-list {
	list-style: none;
	margin: 0;
	padding: 0;
	display: flex;
	flex-direction: column;
	gap: 10px;
}

.step {
	display: flex;
	align-items: center;
	gap: 10px;
	padding: 12px 12px;
	border: 1px solid var(--glass-border);
	border-radius: 12px;
	background: var(--glass-bg);
	background-image: var(--glass-highlight);
	backdrop-filter: blur(var(--glass-blur)) saturate(1.2);
	cursor: pointer;
	transition: border .2s, transform .12s, box-shadow .2s;
	box-shadow: 0 6px 18px rgba(0,0,0,0.25);
}

.step:hover { border-color: var(--glass-border-strong); box-shadow: 0 8px 22px rgba(0,0,0,0.3); transform: translateY(-1px); }

.step.active { border-color: var(--primary); box-shadow: 0 0 0 1px var(--ring-primary) inset, 0 10px 28px rgba(0,0,0,0.32); }

.step .index {
	width: 28px;
	height: 28px;
	border-radius: 8px;
	background: rgba(15,19,36,0.7);
	border: 1px solid #1c2440;
	display: grid;
	place-items: center;
	color: var(--muted);
	font-weight: 600;
}

.step.complete .index { background: rgba(15,31,19,0.7); border-color: #1d3f2a; color: #9fe7c7; }

.step .name { flex: 1; font-size: 14px; }
.step .tag { color: var(--muted); font-size: 12px; }

.content { display: grid; gap: 16px; }

.card {
	border: 1px solid var(--glass-border);
	border-radius: var(--radius);
	background: var(--glass-bg);
	background-image: var(--glass-highlight);
	box-shadow: 0 18px 40px rgba(0,0,0,0.35);
	backdrop-filter: blur(var(--glass-blur)) saturate(1.2);
}

.card-header { padding: 18px 18px 0 18px; }
.card-body { padding: 0 18px 18px 18px; }

.muted { color: var(--muted); }
.muted-card { padding: 16px 18px; color: var(--muted); }

.chip {
	display: inline-block;
	padding: 4px 10px;
	border-radius: 999px;
	background: rgba(15,19,36,0.6);
	border: 1px solid #1c2440;
	color: #c1d2ff;
	font-size: 12px;
	font-weight: 600;
	margin-bottom: 8px;
	backdrop-filter: blur(calc(var(--glass-blur) * 0.6));
}

#exercise-title { margin: 6px 0 8px 0; }

.instructions h3 { margin: 8px 0 8px; font-size: 14px; color: #cfd6e6; }
.instruction-list { margin: 0 0 10px 16px; padding: 0; }
.instruction-list li { margin: 6px 0; line-height: 1.5; }

.targets { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 10px; margin: 10px 0 14px; }
.target { border: 1px dashed var(--glass-border-strong); border-radius: 10px; padding: 10px; color: #cbd5e1; background: var(--glass-bg-raised); backdrop-filter: blur(calc(var(--glass-blur) * 0.8)); }
.target.caution { border-color: rgba(255,107,107,0.25); background: rgba(20,15,17,0.6); color: #f6c8c8; }

.controls { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; align-items: start; }
.timer { border: 1px solid var(--glass-border); border-radius: 12px; padding: 14px; background: var(--glass-bg-raised); backdrop-filter: blur(calc(var(--glass-blur) * 0.9)); box-shadow: 0 10px 26px rgba(0,0,0,0.3); }
.timer-display { font-size: 42px; font-weight: 700; letter-spacing: 1px; text-align: center; margin-bottom: 10px; }
.timer-buttons { display: flex; justify-content: center; gap: 8px; }

.counters { border: 1px solid var(--glass-border); border-radius: 12px; padding: 14px; background: var(--glass-bg-raised); display: grid; grid-template-columns: 1fr 1fr; gap: 16px; backdrop-filter: blur(calc(var(--glass-blur) * 0.9)); }
.counter label { display: block; color: var(--muted); font-size: 12px; margin-bottom: 8px; }
.counter-row { display: grid; grid-template-columns: 36px 1fr 36px; align-items: center; gap: 8px; }
.count { text-align: center; font-size: 26px; font-weight: 700; }

.nav { display: flex; gap: 10px; justify-content: space-between; padding: 12px 18px 18px; }

.app-footer { padding: 24px; text-align: center; color: var(--muted); position: relative; z-index: 1; }

/* Buttons */
.primary-btn, .secondary-btn, .ghost-btn, .success-btn, .icon-btn {
	appearance: none; border: none; cursor: pointer; font-weight: 600; border-radius: 10px; transition: transform .12s ease, background .2s, color .2s, border .2s, box-shadow .2s;
}
.primary-btn { background: linear-gradient(180deg, var(--primary) 0%, var(--primary-600) 100%); color: #06122b; padding: 10px 14px; box-shadow: 0 8px 20px rgba(63,131,255,0.35), 0 0 0 1px rgba(255,255,255,0.08) inset; }
.primary-btn:hover { filter: saturate(1.05) brightness(1.03); transform: translateY(-1px); }
.secondary-btn { background: var(--glass-bg); color: #d5ddf0; border: 1px solid var(--glass-border); padding: 10px 14px; backdrop-filter: blur(calc(var(--glass-blur) * 0.8)); }
.secondary-btn:hover { border-color: var(--glass-border-strong); transform: translateY(-1px); }
.ghost-btn { background: transparent; color: #c8d0e3; border: 1px dashed var(--glass-border-strong); padding: 10px 14px; }
.ghost-btn:hover { border-color: #3b4770; transform: translateY(-1px); }
.success-btn { background: linear-gradient(180deg, #3fddaa 0%, #28c38f 100%); color: #0a2b1f; padding: 10px 14px; box-shadow: 0 8px 18px rgba(40,195,143,0.28); }
.icon-btn { width: 36px; height: 36px; display: grid; place-items: center; background: var(--glass-bg); color: #cbd5e1; border: 1px solid var(--glass-border); backdrop-filter: blur(calc(var(--glass-blur) * 0.8)); }
.icon-btn:hover { border-color: var(--glass-border-strong); transform: translateY(-1px); }

button:active { transform: translateY(1px); }
button:focus-visible { outline: none; box-shadow: 0 0 0 3px var(--ring-primary); }

/* Responsive */
@media (max-width: 980px) {
	.app-main { grid-template-columns: 1fr; }
	.sidebar { position: static; height: auto; }
	.controls { grid-template-columns: 1fr; }
	.counters { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 520px) {
	.nav { flex-wrap: wrap; }
	.counters { grid-template-columns: 1fr; }
}

/* Light theme */
.light {
	--bg: #f6f7fb;
	--panel: #ffffff;
	--muted: #687386;
	--text: #1d2433;
	--primary: #3465ff;
	--primary-600: #1f4bff;
	--success: #22c55e;
	--border: #e5e9f2;
	/* glass overrides */
	--glass-bg: rgba(255,255,255,0.7);
	--glass-bg-raised: rgba(255,255,255,0.82);
	--glass-border: rgba(10,20,60,0.08);
	--glass-border-strong: rgba(10,20,60,0.16);
	--ring-primary: rgba(52,101,255,0.25);
	background: radial-gradient(1200px 700px at 20% -10%, #f0f3ff 0%, #f7f8fc 60%), #f7f8fc;
}

.light .card, .light .timer, .light .counters, .light .step, .light .muted-card { background: var(--glass-bg); backdrop-filter: blur(var(--glass-blur)); }
.light .step:hover { border-color: #d7def1; }
.light .step .index { background: #eef2ff; border-color: #e5e9ff; color: #5865a8; }
.light .step.complete .index { background: #e8fff4; border-color: #c3f2df; color: #0f8a57; }
.light .chip { background: rgba(238,242,255,0.8); border-color: #e2e8ff; color: #2a49c2; backdrop-filter: blur(calc(var(--glass-blur) * 0.5)); }
.light .target { background: var(--glass-bg-raised); border-color: rgba(10,20,60,0.12); color: #2a3345; }
.light .target.caution { background: rgba(255,247,247,0.9); border-color: #ffd9d9; color: #7a2d2d; }