/* The "How it works" deck. */
.deck { width: min(960px, 100%); margin: 0 auto; }

/* step progress: one segment per slide, filled up to the current one */
.dots { display: flex; gap: 5px; margin: 0 0 .9rem; }
.dot { flex: 1; height: 6px; min-width: 0; padding: 0; border: 0; border-radius: 999px; background: var(--surface-3); cursor: pointer; position: relative; transition: background-color .25s var(--ease); }
.dot::after { content: ''; position: absolute; inset: -8px 0; } /* a larger target than it looks */
.dot:hover { background: var(--line-strong); }
.dot.done { background: color-mix(in srgb, var(--accent) 45%, var(--surface-3)); }
.dot[aria-current='true'] { background: var(--accent); }

.deck .stage {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-lg); box-shadow: var(--shadow);
  padding: clamp(1.15rem, 3vw, 1.8rem) clamp(1.15rem, 3.4vw, 2.1rem); min-height: 470px; overflow: hidden; position: relative;
}
.slide .kicker { display: inline-flex; align-items: center; gap: .5rem; color: var(--accent-ink); font-weight: 700; font-size: .74rem; letter-spacing: .1em; text-transform: uppercase; margin: 0 0 .7rem; }
.slide .kicker::before { content: ''; width: 18px; height: 2px; border-radius: 2px; background: var(--brass); }
.slide h2 { font-size: clamp(1.45rem, 3.2vw, 2.05rem); letter-spacing: -.025em; margin-bottom: .55rem; }
.slide .lead { font-size: 1.04rem; color: var(--text-2); max-width: 64ch; margin-bottom: 0; }

.diagram-holder {
  margin: 1.1rem 0 0; border-radius: var(--radius); padding: 1rem 1.1rem .6rem;
  background:
    radial-gradient(circle at 1px 1px, color-mix(in srgb, var(--text) 9%, transparent) 1px, transparent 1.4px) 0 0 / 18px 18px,
    var(--surface-2);
  border: 1px solid var(--line);
}

.points { list-style: none; margin: 1rem 0 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .65rem; }
.points li {
  position: relative; padding: .7rem .8rem .7rem 2.2rem; border-radius: var(--radius-sm); background: var(--surface-2); border: 1px solid var(--line);
  color: var(--text-2); font-size: .9rem; line-height: 1.4;
}
.points li::before {
  content: ''; position: absolute; left: .75rem; top: .8rem; width: 16px; height: 16px; background: var(--ok);
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.6' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12.5l4.5 4.5L19 7.5'/%3E%3C/svg%3E") center / contain no-repeat;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.6' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12.5l4.5 4.5L19 7.5'/%3E%3C/svg%3E") center / contain no-repeat;
}
.slide.limits .points { grid-template-columns: 1fr; max-width: 640px; margin-top: 1.5rem; }
.slide.limits .points li { background: var(--warn-soft); border-color: color-mix(in srgb, var(--warn) 28%, transparent); color: var(--text); font-size: .98rem; padding: .9rem 1rem .9rem 2.6rem; }
.slide.limits .points li::before {
  background: var(--warn); top: .95rem; left: .9rem; width: 18px; height: 18px;
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M12 3.5l9.5 16.5h-19z'/%3E%3Cpath d='M12 10v4.5M12 17.5v.3'/%3E%3C/svg%3E");
  mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M12 3.5l9.5 16.5h-19z'/%3E%3Cpath d='M12 10v4.5M12 17.5v.3'/%3E%3C/svg%3E");
}

/* the opening slide: words on the left, the vault dial on the right */
.slide.has-art { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 2rem; align-items: center; min-height: 400px; }
.slide.has-art .points { grid-template-columns: 1fr; max-width: 420px; }
.slide-art { border-radius: var(--radius-lg); padding: 2rem; background: radial-gradient(circle at 50% 40%, #145240, #0a2a21 70%); box-shadow: inset 0 0 0 1px rgb(255 255 255 / 6%); }
.slide-art .dial { max-width: 300px; margin: 0 auto; }

.deck-bar { display: flex; align-items: center; gap: .6rem; margin-top: 1rem; flex-wrap: wrap; }
.deck-bar .count { font-variant-numeric: tabular-nums; color: var(--muted); font-weight: 600; font-size: .9rem; padding: 0 .4rem; }

/* slide transitions */
.slide.enter-fwd { animation: slide-in-r .38s var(--ease) both; }
.slide.enter-back { animation: slide-in-l .38s var(--ease) both; }
.slide.enter-first { animation: slide-fade .4s var(--ease) both; }
@keyframes slide-in-r { from { opacity: .3; transform: translateX(24px); } 50% { opacity: 1; } to { opacity: 1; transform: none; } }
@keyframes slide-in-l { from { opacity: .3; transform: translateX(-24px); } 50% { opacity: 1; } to { opacity: 1; transform: none; } }
@keyframes slide-fade { from { opacity: .3; transform: translateY(8px); } 50% { opacity: 1; } to { opacity: 1; transform: none; } }
.diagram-holder .diagram { max-height: 236px; margin: 0 auto; }

@media (max-width: 760px) {
  .points { grid-template-columns: 1fr; }
  .slide.has-art { grid-template-columns: 1fr; gap: 1.25rem; min-height: 0; }
  .slide-art { order: -1; padding: 1.1rem; }
  .slide-art .dial { max-width: 150px; }
  .deck .stage { min-height: 0; }
  .diagram-holder { padding: .6rem .4rem .3rem; margin-left: -.4rem; margin-right: -.4rem; }
}

/* --- diagrams */
.diagram { display: block; width: 100%; height: auto; overflow: visible; }
.diagram .box rect { fill: var(--surface); stroke: var(--line-strong); stroke-width: 1.5; }
.diagram .box .badge-bg { fill: var(--muted); stroke: var(--surface-2); stroke-width: 3; }
.diagram .box .glyph { fill: none; stroke: var(--surface); stroke-width: 2.6; stroke-linecap: round; stroke-linejoin: round; }
.diagram .box.a rect { fill: var(--accent-soft); stroke: color-mix(in srgb, var(--accent) 65%, transparent); }
.diagram .box.a .badge-bg { fill: var(--accent); }
.diagram .box.b rect { fill: var(--brass-soft); stroke: color-mix(in srgb, var(--brass) 65%, transparent); }
.diagram .box.b .badge-bg { fill: var(--brass); }
.diagram .box.c rect { fill: var(--surface); stroke: var(--line-strong); }
.diagram .box.c .badge-bg { fill: var(--text-2); }
.diagram .box.ok rect { fill: var(--ok-soft); stroke: color-mix(in srgb, var(--ok) 65%, transparent); }
.diagram .box.ok .badge-bg { fill: var(--ok); }
.diagram .box.danger rect { fill: var(--danger-soft); stroke: color-mix(in srgb, var(--danger) 65%, transparent); }
.diagram .box.danger .badge-bg { fill: var(--danger); }
.diagram text { fill: var(--text); font: 14px var(--font); }
.diagram text.strong { font-weight: 650; }
.diagram text.sub { fill: var(--muted); font-size: 12.5px; }
.diagram text.note { fill: var(--muted); font-size: 12.5px; font-style: italic; }
.diagram text.plus { font-size: 28px; font-weight: 300; fill: var(--muted); }
.diagram .arrow { stroke: var(--muted); stroke-width: 1.8; fill: none; stroke-linecap: round; }
.diagram .arrow.dash { stroke-dasharray: 5 5; animation: flow 1.2s linear infinite; }
.diagram .arrow-tip { fill: var(--muted); }
@keyframes flow { to { stroke-dashoffset: -20; } }