/* ── Learnings / Tutorial styles ── */

/* ─────────────────────────────────────────────────────────────────
   LEARNINGS TABLE OF CONTENTS (Directory Tree)
───────────────────────────────────────────────────────────────── */

.learnings-toc {
    margin-top: 12px;
}

.toc-tree {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.85rem;
}

.toc-folder {
    margin-left: 0;
}

.toc-folder-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    color: var(--accent-color);
    font-weight: 600;
    letter-spacing: 0.3px;
}

.toc-icon {
    flex-shrink: 0;
    opacity: 0.7;
}

.toc-folder-name {
    color: var(--accent-color);
}

.toc-children {
    margin-left: 24px;
    border-left: 1px solid rgba(53, 255, 107, 0.15);
    padding-left: 12px;
}

.toc-file {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    padding: 10px 14px;
    margin: 4px 0;
    border-radius: 8px;
    border: 1px solid rgba(53, 255, 107, 0.1);
    background: rgba(0, 5, 2, 0.6);
    text-decoration: none;
    color: var(--text-color);
    transition: all 0.2s ease;
}

.toc-file:hover {
    background: rgba(53, 255, 107, 0.06);
    border-color: rgba(53, 255, 107, 0.3);
    transform: translateX(4px);
}

.toc-file .toc-icon {
    margin-top: 2px;
    color: var(--muted-text);
}

.toc-file:hover .toc-icon {
    color: var(--accent-color);
}

.toc-file-name {
    color: var(--accent-color);
    font-weight: 600;
    font-size: 0.88rem;
    margin-right: 8px;
    white-space: nowrap;
}

.toc-file-desc {
    color: var(--muted-text);
    font-size: 0.76rem;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.4;
}

/* ─────────────────────────────────────────────────────────────────
   STEP TABLE OF CONTENTS
───────────────────────────────────────────────────────────────── */

.step-toc {
    width: min(1100px, calc(100% - 32px));
    margin: 0 auto 6px;
    padding: 18px 0 0;
}

.step-toc-header {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.7rem;
    letter-spacing: 0.18em;
    color: var(--muted-text);
    margin-bottom: 10px;
    text-transform: uppercase;
}

.step-toc-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 4px 12px;
}

.step-toc-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    background: transparent;
    border: 1px solid rgba(53, 255, 107, 0.1);
    border-radius: 6px;
    color: var(--muted-text);
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.78rem;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
    width: 100%;
}

.step-toc-item:hover {
    background: rgba(53, 255, 107, 0.06);
    border-color: rgba(53, 255, 107, 0.3);
    color: var(--text-color);
    transform: translateX(3px);
}

.step-toc-item.active {
    background: rgba(53, 255, 107, 0.1);
    border-color: var(--accent-color);
    color: var(--accent-color);
    font-weight: 600;
}

.step-toc-item.done {
    color: var(--muted-text);
    border-color: rgba(53, 255, 107, 0.2);
}

.step-toc-item.done .step-toc-num {
    color: var(--accent-color);
    opacity: 0.7;
}

.step-toc-num {
    font-size: 0.68rem;
    color: var(--muted-text);
    opacity: 0.6;
    min-width: 20px;
}

.step-toc-item.active .step-toc-num {
    color: var(--accent-color);
    opacity: 1;
}

/* ─────────────────────────────────────────────────────────────────
   STEP NAVIGATION
───────────────────────────────────────────────────────────────── */

.step-wrap {
    width: min(1100px, calc(100% - 32px));
    margin: 0 auto 10px;
    padding: 20px 0 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.step-indicator {
    display: flex;
    align-items: center;
    gap: 0;
    flex-wrap: nowrap;
    overflow-x: auto;
    scrollbar-width: none;
    padding-bottom: 2px;
}

.step-indicator::-webkit-scrollbar { display: none; }

.step-dot {
    flex-shrink: 0;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: 1px solid rgba(53, 255, 107, 0.25);
    background: rgba(0, 5, 2, 0.9);
    color: var(--muted-text);
    font-size: 0.68rem;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    letter-spacing: 0;
    transition: all 0.22s ease;
    user-select: none;
}

.step-dot:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
    box-shadow: 0 0 10px rgba(53, 255, 107, 0.18);
}

.step-dot.active {
    border-color: var(--accent-color);
    background: rgba(53, 255, 107, 0.15);
    color: var(--accent-color);
    box-shadow: 0 0 14px rgba(53, 255, 107, 0.25);
    transform: scale(1.1);
}

.step-dot.done {
    border-color: var(--accent-secondary);
    background: rgba(26, 164, 71, 0.1);
    color: var(--accent-secondary);
}

.step-conn {
    flex-shrink: 0;
    width: 22px;
    height: 1px;
    background: rgba(53, 255, 107, 0.18);
    transition: background 0.3s;
}

.step-conn.done {
    background: var(--accent-secondary);
}

.step-progress-label {
    font-size: 0.7rem;
    color: var(--muted-text);
    letter-spacing: 0.18em;
    text-transform: uppercase;
    display: flex;
    align-items: center;
    gap: 10px;
}

.step-progress-label .step-name {
    color: var(--accent-color);
    font-weight: 700;
}

/* ── Step Panels ── */

.step-panel {
    display: none;
}

.step-panel.active {
    display: block;
    animation: stepEnterRight 0.32s cubic-bezier(0.22, 1, 0.36, 1);
}

.step-panel.active.from-prev {
    animation: stepEnterLeft 0.32s cubic-bezier(0.22, 1, 0.36, 1);
}

@keyframes stepEnterRight {
    from { opacity: 0; transform: translateX(28px); }
    to   { opacity: 1; transform: translateX(0); }
}

@keyframes stepEnterLeft {
    from { opacity: 0; transform: translateX(-28px); }
    to   { opacity: 1; transform: translateX(0); }
}

/* ── Prev / Next button cards ── */

.step-nav-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin-top: 40px;
}

.step-nav-cards.only-next {
    grid-template-columns: 1fr;
    justify-items: end;
}

.step-nav-cards.only-prev {
    grid-template-columns: 1fr 1fr;
}

.step-btn {
    position: relative;
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 20px;
    border: 1px solid var(--border-color);
    border-radius: 14px;
    background:
        linear-gradient(180deg, rgba(1, 8, 3, 0.96), rgba(0, 4, 1, 0.94)),
        linear-gradient(90deg, rgba(53, 255, 107, 0.05), transparent 55%);
    cursor: pointer;
    text-align: left;
    overflow: hidden;
    transition: border-color 0.25s, box-shadow 0.25s, transform 0.22s;
    width: 100%;
    text-decoration: none;
}

.step-btn::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    pointer-events: none;
    background:
        linear-gradient(90deg, transparent, rgba(53, 255, 107, 0.85), transparent) top / 220% 1px no-repeat,
        linear-gradient(270deg, transparent, rgba(53, 255, 107, 0.85), transparent) bottom / 220% 1px no-repeat;
    opacity: 0;
    transition: opacity 0.2s;
}

.step-btn:hover {
    border-color: var(--accent-color);
    box-shadow: 0 0 22px rgba(53, 255, 107, 0.18);
    transform: translateY(-2px);
}

.step-btn:hover::after {
    opacity: 1;
    animation: stepBtnTrace 1.8s linear infinite;
}

@keyframes stepBtnTrace {
    0%   { background-position: -220% 0, 220% 100%; }
    100% { background-position: 220% 0, -220% 100%; }
}

.step-btn.next {
    justify-content: flex-end;
    text-align: right;
}

.step-btn-arrow {
    font-size: 1.3rem;
    color: var(--accent-color);
    flex-shrink: 0;
    line-height: 1;
}

.step-btn-text {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.step-btn-label {
    font-size: 0.66rem;
    color: var(--muted-text);
    letter-spacing: 0.18em;
    text-transform: uppercase;
}

.step-btn-name {
    font-size: 0.85rem;
    color: var(--accent-color);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ─────────────────────────────────────────────────────────────────
   PSEUDO-CODE BLOCKS
───────────────────────────────────────────────────────────────── */

.pseudo-block {
    margin: 24px 0;
    border: 1px solid var(--border-color);
    border-radius: 14px;
    overflow: hidden;
    background: rgba(0, 5, 2, 0.97);
    box-shadow: 0 0 22px rgba(53, 255, 107, 0.1);
}

.pseudo-header {
    padding: 10px 18px;
    background: rgba(53, 255, 107, 0.09);
    border-bottom: 1px solid var(--border-color);
    color: var(--accent-color);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.pseudo-code {
    margin: 0;
    padding: 20px 22px;
    font-family: "Courier New", Consolas, monospace;
    font-size: 0.84rem;
    line-height: 1.75;
    color: var(--text-color);
    overflow-x: auto;
    white-space: pre;
    tab-size: 4;
}

.pseudo-code .kw  { color: var(--accent-color);  font-weight: 700; }
.pseudo-code .cm  { color: var(--muted-text);    font-style: italic; }
.pseudo-code .num { color: var(--warning-color); }
.pseudo-code .fn  { color: #7fffd4; }
.pseudo-code .hl  {
    background: rgba(53, 255, 107, 0.12);
    border-left: 2px solid var(--accent-color);
    display: inline-block;
    width: 100%;
    padding: 0 4px;
    margin: 0 -4px;
    transition: background 0.3s;
}

/* ─────────────────────────────────────────────────────────────────
   HASH VISUALIZER
───────────────────────────────────────────────────────────────── */

.hash-viz-wrap {
    margin: 20px 0;
    border: 1px solid var(--border-color);
    border-radius: 14px;
    overflow: hidden;
    background: rgba(0, 5, 2, 0.97);
    box-shadow: 0 0 18px rgba(53, 255, 107, 0.08);
}

.hash-viz-bar {
    padding: 10px 18px;
    background: rgba(53, 255, 107, 0.07);
    border-bottom: 1px solid var(--border-color);
    color: var(--accent-color);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    text-transform: uppercase;
}

.hash-viz-body {
    padding: 20px 22px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.hash-input-row {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.hash-input-row input {
    flex: 1;
    min-width: 180px;
}

.hash-output { display: flex; flex-direction: column; gap: 12px; }

.hash-hex-line {
    font-size: 0.85rem;
    color: var(--muted-text);
}

.hash-hex-line span {
    color: var(--warning-color);
    font-weight: 700;
}

.binary-row {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 2px;
    font-family: "Courier New", Consolas, monospace;
    font-size: 0.75rem;
    min-height: 26px;
}

.bit {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 22px;
    border: 1px solid rgba(53, 255, 107, 0.14);
    border-radius: 3px;
    background: rgba(0, 5, 2, 0.6);
    color: var(--muted-text);
    opacity: 0;
    transform: translateY(-4px);
    transition: opacity 0.18s, transform 0.18s, background 0.25s, border-color 0.25s;
}

.bit.visible { opacity: 1; transform: translateY(0); }
.bit.idx  { background: rgba(53, 255, 107, 0.2); border-color: var(--accent-color); color: var(--accent-color); }
.bit.zero { background: rgba(154, 255, 87, 0.14); border-color: var(--warning-color); color: var(--warning-color); }
.bit.one  { background: rgba(255, 255, 255, 0.04); border-color: rgba(53, 255, 107, 0.2); color: rgba(200, 230, 200, 0.55); }
.bit.sep  { background: transparent; border: none; color: rgba(53, 255, 107, 0.4); font-size: 0.9rem; width: 10px; }

.binary-legend {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    font-size: 0.75rem;
    color: var(--muted-text);
}

.legend-item { display: flex; align-items: center; gap: 6px; }

.legend-dot {
    width: 12px;
    height: 12px;
    border-radius: 3px;
    border: 1px solid;
}

.legend-dot.idx  { background: rgba(53, 255, 107, 0.2); border-color: var(--accent-color); }
.legend-dot.zero { background: rgba(154, 255, 87, 0.14); border-color: var(--warning-color); }
.legend-dot.rest { background: rgba(255, 255, 255, 0.04); border-color: rgba(53, 255, 107, 0.2); }

.hash-result-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 10px;
}

.hash-card {
    padding: 12px 14px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    background: rgba(1, 8, 3, 0.96);
}

.hash-card-label {
    font-size: 0.68rem;
    color: var(--muted-text);
    letter-spacing: 0.14em;
    text-transform: uppercase;
    margin-bottom: 4px;
}

.hash-card-value {
    font-size: 1.1rem;
    color: var(--accent-color);
    font-weight: 700;
    transition: color 0.25s;
}

/* ─────────────────────────────────────────────────────────────────
   HLL PLAYGROUND
───────────────────────────────────────────────────────────────── */

.hll-demo-wrap {
    margin: 24px 0;
    border: 1px solid var(--border-color);
    border-radius: 14px;
    overflow: hidden;
    background: rgba(0, 5, 2, 0.97);
    box-shadow: 0 0 22px rgba(53, 255, 107, 0.1);
}

.hll-demo-bar {
    padding: 10px 18px;
    background: rgba(53, 255, 107, 0.07);
    border-bottom: 1px solid var(--border-color);
    color: var(--accent-color);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.hll-demo-body { padding: 20px 22px; display: flex; flex-direction: column; gap: 20px; }

.hll-registers {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 5px;
}

.hll-reg {
    position: relative;
    aspect-ratio: 1;
    border: 1px solid rgba(53, 255, 107, 0.18);
    border-radius: 6px;
    background: rgba(0, 5, 2, 0.9);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: 0.72rem;
    color: var(--muted-text);
    transition: background 0.28s ease, border-color 0.28s ease, box-shadow 0.28s ease, transform 0.15s ease;
    cursor: default;
}

.hll-reg .reg-idx {
    font-size: 0.52rem;
    color: rgba(53, 255, 107, 0.28);
    position: absolute;
    top: 3px;
    left: 4px;
}

.hll-reg .reg-val {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--accent-color);
    transition: color 0.2s;
}

.hll-reg.flash {
    animation: regFlash 0.45s ease;
}

.hll-reg.active {
    border-color: var(--accent-color);
    box-shadow: 0 0 14px rgba(53, 255, 107, 0.35);
    transform: scale(1.08);
    z-index: 1;
}

@keyframes regFlash {
    0%   { background: rgba(53, 255, 107, 0.55); box-shadow: 0 0 20px rgba(53, 255, 107, 0.5); transform: scale(1.12); }
    60%  { background: rgba(53, 255, 107, 0.2); }
    100% { background: inherit; transform: scale(1); }
}

/* streaming item ticker */
.hll-ticker {
    height: 28px;
    overflow: hidden;
    border: 1px solid rgba(53, 255, 107, 0.12);
    border-radius: 6px;
    background: rgba(0, 3, 1, 0.95);
    padding: 0 10px;
    display: flex;
    align-items: center;
    font-size: 0.72rem;
    color: var(--muted-text);
    position: relative;
}

.hll-ticker-item {
    position: absolute;
    white-space: nowrap;
    animation: tickerIn 0.3s ease forwards;
}

@keyframes tickerIn {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}

.hll-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 10px;
}

.hll-stat {
    padding: 14px 16px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    background: rgba(1, 8, 3, 0.96);
    text-align: center;
}

.hll-stat-label {
    font-size: 0.66rem;
    color: var(--muted-text);
    letter-spacing: 0.14em;
    text-transform: uppercase;
    margin-bottom: 5px;
}

.hll-stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-color);
    line-height: 1.1;
    transition: color 0.25s;
    font-variant-numeric: tabular-nums;
}

.hll-stat-value.warn { color: var(--warning-color); }
.hll-stat-value.good { color: #7fffd4; }

.hll-controls { display: flex; gap: 10px; flex-wrap: wrap; align-items: flex-end; }
.hll-controls input { flex: 1; min-width: 150px; }

.hll-btn-group { display: flex; gap: 8px; flex-wrap: wrap; }
.hll-btn-group button { font-size: 0.78rem; padding: 9px 14px; min-height: 0; }

.hll-log {
    max-height: 90px;
    overflow-y: auto;
    border: 1px solid rgba(53, 255, 107, 0.12);
    border-radius: 8px;
    background: rgba(0, 3, 1, 0.96);
    padding: 8px 12px;
    font-size: 0.72rem;
    color: var(--muted-text);
    display: flex;
    flex-direction: column-reverse;
    gap: 3px;
}

.log-entry { line-height: 1.4; }
.log-entry .log-key  { color: var(--warning-color); }
.log-entry .log-reg  { color: var(--accent-color); }
.log-entry .log-rho  { color: #7fffd4; }
.log-entry .log-new  { color: rgba(53, 255, 107, 0.6); font-style: italic; }

/* ─────────────────────────────────────────────────────────────────
   MEMORY DEEP DIVE
───────────────────────────────────────────────────────────────── */

.mem-panel {
    border: 1px solid var(--border-color);
    border-radius: 14px;
    overflow: hidden;
    background: rgba(0, 5, 2, 0.97);
    box-shadow: 0 0 18px rgba(53, 255, 107, 0.08);
    margin: 20px 0;
}

.mem-panel-bar {
    padding: 10px 18px;
    background: rgba(53, 255, 107, 0.07);
    border-bottom: 1px solid var(--border-color);
    color: var(--accent-color);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    text-transform: uppercase;
}

.mem-panel-body {
    padding: 22px 22px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.mem-sliders {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.mem-slider-row {
    display: flex;
    align-items: center;
    gap: 12px;
}

.mem-slider-row label {
    font-size: 0.8rem;
    color: var(--muted-text);
    min-width: 90px;
    flex-shrink: 0;
}

.mem-slider-row input[type="range"] {
    flex: 1;
    min-width: 100px;
    height: 4px;
    border: none;
    border-radius: 99px;
    background: rgba(53, 255, 107, 0.2);
    outline: none;
    box-shadow: none;
    cursor: pointer;
    padding: 0;
    appearance: none;
    -webkit-appearance: none;
}

.mem-slider-row input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent-color);
    box-shadow: 0 0 8px rgba(53, 255, 107, 0.5);
    cursor: pointer;
}

.mem-slider-row .mem-val {
    font-size: 0.88rem;
    font-weight: 700;
    min-width: 70px;
    text-align: right;
    font-variant-numeric: tabular-nums;
}

/* stat cards reused from hash-result-cards */

.mem-compare-wrap {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.mem-compare-label {
    font-size: 0.7rem;
    color: var(--muted-text);
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

.mem-bar-row {
    display: flex;
    align-items: center;
    gap: 10px;
    height: 26px;
}

.mem-bar-name {
    font-size: 0.72rem;
    color: var(--muted-text);
    min-width: 56px;
    flex-shrink: 0;
    text-align: right;
}

.mem-bar-track {
    flex: 1;
    height: 14px;
    border-radius: 7px;
    background: rgba(53, 255, 107, 0.06);
    border: 1px solid rgba(53, 255, 107, 0.14);
    overflow: hidden;
    position: relative;
}

.mem-bar-fill {
    height: 100%;
    border-radius: 7px;
    transition: width 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
    position: relative;
}

.mem-bar-fill.hll-fill {
    background: linear-gradient(90deg, var(--accent-secondary), var(--accent-color));
    box-shadow: 0 0 8px rgba(53, 255, 107, 0.4);
}

.mem-bar-fill.set-fill {
    background: linear-gradient(90deg, rgba(154, 255, 87, 0.4), rgba(154, 255, 87, 0.7));
    box-shadow: 0 0 6px rgba(154, 255, 87, 0.2);
}

.mem-bar-annotation {
    font-size: 0.7rem;
    color: var(--muted-text);
    min-width: 80px;
    font-variant-numeric: tabular-nums;
}

/* Register byte tape */
.byte-tape-label {
    font-size: 0.7rem;
    color: var(--muted-text);
    letter-spacing: 0.14em;
    text-transform: uppercase;
    margin-bottom: 8px;
}

.byte-tape {
    display: flex;
    flex-wrap: wrap;
    gap: 3px;
    max-height: 160px;
    overflow: hidden;
    position: relative;
}

.byte-cell {
    width: 11px;
    height: 11px;
    border-radius: 2px;
    background: rgba(53, 255, 107, 0.22);
    border: 1px solid rgba(53, 255, 107, 0.35);
    transition: all 0.4s;
    flex-shrink: 0;
}

.byte-cell.reg-bit { background: rgba(53, 255, 107, 0.22); border-color: rgba(53, 255, 107, 0.38); }
.byte-cell.boundary { background: rgba(53, 255, 107, 0.08); border-color: rgba(53, 255, 107, 0.2); }

.byte-tape-overflow {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 40px;
    background: linear-gradient(0deg, rgba(0,5,2,0.97), transparent);
    display: flex;
    align-items: flex-end;
    padding-bottom: 4px;
    font-size: 0.72rem;
    color: var(--muted-text);
}

/* ─────────────────────────────────────────────────────────────────
   HASH STREAM VISUALIZATION (Step 1)
───────────────────────────────────────────────────────────────── */

.hash-stream-wrap {
    border: 1px solid var(--border-color);
    border-radius: 14px;
    overflow: hidden;
    background: rgba(0, 5, 2, 0.97);
    box-shadow: 0 0 22px rgba(53, 255, 107, 0.1);
}

.hash-stream-bar {
    padding: 10px 18px;
    background: rgba(53, 255, 107, 0.07);
    border-bottom: 1px solid var(--border-color);
    color: var(--accent-color);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.hash-stream-body {
    padding: 20px 22px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.hash-stream-desc {
    color: var(--muted-text);
    font-size: 0.83rem;
    margin: 0;
    line-height: 1.5;
}

.hash-stream-layout {
    display: grid;
    grid-template-columns: 1fr 260px;
    gap: 20px;
    align-items: start;
}

@media (max-width: 720px) {
    .hash-stream-layout {
        grid-template-columns: 1fr;
    }
}

/* ── Main visualization area ── */

.hash-stream-main {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.hash-stream-current {
    padding: 16px 18px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    background: rgba(1, 8, 3, 0.96);
    display: flex;
    flex-direction: column;
    gap: 8px;
    align-items: center;
    min-height: 120px;
    justify-content: center;
}

.stream-current-label {
    font-size: 0.62rem;
    color: var(--muted-text);
    letter-spacing: 0.2em;
    text-transform: uppercase;
}

.stream-current-name {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--accent-color);
    font-family: "Courier New", Consolas, monospace;
    letter-spacing: 0.04em;
    transition: color 0.2s;
}

.stream-current-name.flash-in {
    animation: nameFlash 0.35s ease;
}

@keyframes nameFlash {
    0%   { color: #fff; text-shadow: 0 0 12px rgba(255,255,255,0.6); transform: scale(1.04); }
    100% { color: var(--accent-color); text-shadow: none; transform: scale(1); }
}

.stream-current-arrow {
    font-size: 0.7rem;
    color: var(--muted-text);
    letter-spacing: 0.1em;
}

.stream-current-bits {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 1px;
    font-family: "Courier New", Consolas, monospace;
    font-size: 0.72rem;
    min-height: 24px;
    justify-content: center;
}

.stream-bit {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 20px;
    border: 1px solid rgba(53, 255, 107, 0.14);
    border-radius: 2px;
    background: rgba(0, 5, 2, 0.6);
    color: rgba(200, 230, 200, 0.5);
    opacity: 0;
    transform: translateY(-3px) scale(0.9);
    animation: bitReveal 0.22s ease forwards;
}

.stream-bit.leading-zero {
    background: rgba(154, 255, 87, 0.14);
    border-color: var(--warning-color);
    color: var(--warning-color);
    font-weight: 700;
}

.stream-bit.first-one {
    background: rgba(53, 255, 107, 0.22);
    border-color: var(--accent-color);
    color: var(--accent-color);
    font-weight: 700;
}

@keyframes bitReveal {
    to { opacity: 1; transform: translateY(0) scale(1); }
}

/* ── Stats cards ── */

.hash-stream-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

@media (max-width: 480px) {
    .hash-stream-stats { grid-template-columns: 1fr; }
}

/* ── Controls ── */

.hash-stream-controls {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.stream-play-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 18px;
    font-size: 0.82rem;
    font-weight: 700;
    border: 1px solid var(--accent-color);
    border-radius: 8px;
    background: rgba(53, 255, 107, 0.12);
    color: var(--accent-color);
    cursor: pointer;
    transition: background 0.2s, box-shadow 0.2s;
    letter-spacing: 0.06em;
}

.stream-play-btn:hover {
    background: rgba(53, 255, 107, 0.22);
    box-shadow: 0 0 14px rgba(53, 255, 107, 0.25);
}

.stream-play-btn svg { flex-shrink: 0; }

.stream-speed-control {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: auto;
}

.stream-speed-control label {
    font-size: 0.72rem;
    color: var(--muted-text);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.stream-speed-control input[type="range"] {
    width: 70px;
    height: 4px;
    border: none;
    border-radius: 99px;
    background: rgba(53, 255, 107, 0.2);
    outline: none;
    cursor: pointer;
    padding: 0;
    appearance: none;
    -webkit-appearance: none;
}

.stream-speed-control input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent-color);
    box-shadow: 0 0 6px rgba(53, 255, 107, 0.5);
    cursor: pointer;
}

/* ── History sidebar ── */

.hash-stream-history {
    border: 1px solid var(--border-color);
    border-radius: 10px;
    background: rgba(1, 8, 3, 0.96);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    max-height: 380px;
}

.stream-history-header {
    padding: 10px 14px;
    font-size: 0.66rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--muted-text);
    border-bottom: 1px solid var(--border-color);
    background: rgba(53, 255, 107, 0.04);
    flex-shrink: 0;
}

.stream-history-list {
    list-style: none;
    margin: 0;
    padding: 0;
    overflow-y: auto;
    flex: 1;
    scrollbar-width: thin;
    scrollbar-color: rgba(53,255,107,0.2) transparent;
}

.stream-history-list::-webkit-scrollbar { width: 4px; }
.stream-history-list::-webkit-scrollbar-thumb { background: rgba(53,255,107,0.2); border-radius: 2px; }

.stream-history-empty {
    padding: 16px 14px;
    font-size: 0.75rem;
    color: rgba(53, 255, 107, 0.3);
    font-style: italic;
    text-align: center;
}

.stream-history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 7px 14px;
    font-size: 0.74rem;
    border-bottom: 1px solid rgba(53, 255, 107, 0.06);
    transition: background 0.2s;
}

.stream-history-item:last-child { border-bottom: none; }

.stream-history-item.newest {
    animation: historySlideIn 0.28s ease;
    background: rgba(53, 255, 107, 0.08);
}

@keyframes historySlideIn {
    from { opacity: 0; transform: translateY(-8px); background: rgba(53,255,107,0.2); }
    to   { opacity: 1; transform: translateY(0); background: rgba(53,255,107,0.08); }
}

.stream-history-item .history-name {
    color: var(--text-color);
    font-family: "Courier New", Consolas, monospace;
    font-size: 0.72rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 160px;
}

.stream-history-item .history-lz {
    color: var(--warning-color);
    font-size: 0.66rem;
    font-weight: 700;
    white-space: nowrap;
    flex-shrink: 0;
    padding-left: 8px;
}

/* ── Legacy badge (re-used) ── */

.auto-run-badge {
    font-size: 0.68rem;
    padding: 3px 10px;
    border: 1px solid var(--accent-color);
    border-radius: 99px;
    background: rgba(53, 255, 107, 0.1);
    color: var(--accent-color);
    letter-spacing: 0.12em;
    animation: badgePulse 1.4s ease-in-out infinite;
}

@keyframes badgePulse {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

/* ─────────────────────────────────────────────────────────────────
   ALGORITHM COMPARISON DEMOS (Steps 2 & 3)
───────────────────────────────────────────────────────────────── */

.algo-demo-wrap {
    border: 1px solid var(--border-color);
    border-radius: 14px;
    overflow: hidden;
    background: rgba(0, 5, 2, 0.97);
    box-shadow: 0 0 22px rgba(53, 255, 107, 0.1);
    margin: 24px 0;
}

.algo-demo-bar {
    padding: 10px 18px;
    background: rgba(53, 255, 107, 0.07);
    border-bottom: 1px solid var(--border-color);
    color: var(--accent-color);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.algo-demo-body {
    padding: 20px 22px;
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.algo-demo-desc {
    color: var(--muted-text);
    font-size: 0.83rem;
    margin: 0;
    line-height: 1.5;
}

.algo-demo-controls {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

/* ── LogLog register grid ── */

.ll-registers-section {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.ll-registers-label {
    font-size: 0.66rem;
    color: var(--muted-text);
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

.ll-registers-grid {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 5px;
}

.ll-registers-grid.hll-cmp-grid {
    grid-template-columns: repeat(8, 1fr);
}

@media (min-width: 600px) {
    .ll-registers-grid.hll-cmp-grid {
        grid-template-columns: repeat(16, 1fr);
    }
}

.ll-reg-cell {
    position: relative;
    aspect-ratio: 1;
    border: 1px solid rgba(53, 255, 107, 0.15);
    border-radius: 5px;
    background: rgba(0, 5, 2, 0.9);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: background 0.28s ease, border-color 0.28s ease;
}

.ll-reg-cell .ll-reg-idx {
    font-size: 0.48rem;
    color: rgba(53, 255, 107, 0.28);
    position: absolute;
    top: 2px;
    left: 3px;
}

.ll-reg-cell .ll-reg-val {
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--accent-color);
}

/* ── Comparison cards ── */

.algo-compare-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

@media (max-width: 560px) {
    .algo-compare-grid { grid-template-columns: 1fr; }
}

.algo-compare-card {
    border: 1px solid var(--border-color);
    border-radius: 10px;
    overflow: hidden;
    background: rgba(1, 8, 3, 0.96);
}

.algo-compare-header {
    padding: 9px 14px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-color);
    border-bottom: 2px solid var(--accent-color);
    background: rgba(53, 255, 107, 0.04);
}

.algo-compare-body {
    padding: 12px 14px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.algo-metric {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.algo-metric-label {
    font-size: 0.74rem;
    color: var(--muted-text);
}

.algo-metric-value {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--accent-color);
    font-variant-numeric: tabular-nums;
    transition: color 0.25s;
}

/* ── Status row ── */

.algo-status-row {
    display: flex;
    gap: 24px;
    font-size: 0.8rem;
    color: var(--muted-text);
    flex-wrap: wrap;
}

/* ── Error chart ── */

.algo-error-chart-wrap {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.algo-error-chart-label {
    font-size: 0.66rem;
    color: var(--muted-text);
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

.algo-error-chart-wrap canvas {
    width: 100%;
    height: 100px;
    border: 1px solid rgba(53, 255, 107, 0.12);
    border-radius: 8px;
    background: rgba(0, 3, 1, 0.96);
}

.algo-error-legend {
    display: flex;
    gap: 16px;
    font-size: 0.7rem;
    color: var(--muted-text);
}

.algo-legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.algo-legend-dot {
    width: 10px;
    height: 3px;
    border-radius: 2px;
}

/* ─────────────────────────────────────────────────────────────────
   HASH VISUALIZER PHASES (Step 5)
───────────────────────────────────────────────────────────────── */

.hash-phase {
    margin-bottom: 16px;
    padding: 12px 16px;
    border: 1px solid rgba(53, 255, 107, 0.1);
    border-radius: 8px;
    background: rgba(0, 3, 1, 0.6);
}

.hash-phase-animate {
    animation: phaseSlideIn 0.4s ease-out;
}

@keyframes phaseSlideIn {
    0% { opacity: 0; transform: translateY(8px); }
    100% { opacity: 1; transform: translateY(0); }
}

.hash-phase-header {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.76rem;
    font-weight: 600;
    color: var(--accent-color);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.hash-phase-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: rgba(53, 255, 107, 0.15);
    border: 1px solid rgba(53, 255, 107, 0.3);
    font-size: 0.68rem;
    font-weight: 700;
}

.hash-phase-content {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.78rem;
    line-height: 1.6;
}

.hviz-char-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin-bottom: 4px;
}

.hviz-char-cell {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 4px 6px;
    border: 1px solid rgba(53, 255, 107, 0.15);
    border-radius: 4px;
    background: rgba(0, 5, 2, 0.8);
    opacity: 0;
    animation: charReveal 0.3s ease-out forwards;
}

@keyframes charReveal {
    0% { opacity: 0; transform: scale(0.8); }
    100% { opacity: 1; transform: scale(1); }
}

.hviz-char-letter {
    font-size: 0.85rem;
    color: var(--accent-color);
    font-weight: 600;
}

.hviz-char-code {
    font-size: 0.6rem;
    color: var(--muted-text);
}

.hviz-fnv-steps {
    line-height: 1.9;
}

.hviz-fnv-line {
    margin-bottom: 2px;
}

.hviz-fnv-label {
    color: var(--muted-text);
    margin-right: 4px;
}

.hviz-bucket-explain,
.hviz-rho-explain,
.hviz-update-explain {
    line-height: 1.8;
}

.hviz-bucket-step {
    margin-bottom: 4px;
    color: var(--text-color);
}

.hviz-bucket-bits {
    display: flex;
    flex-wrap: wrap;
    gap: 2px;
    margin: 6px 0;
}

.hviz-bit-box {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    border-radius: 3px;
    font-size: 0.75rem;
    font-weight: 600;
    font-family: 'JetBrains Mono', monospace;
}

.hviz-bit-idx {
    background: rgba(154, 255, 87, 0.15);
    border: 1px solid rgba(154, 255, 87, 0.3);
    color: #9aff57;
}

.hviz-bit-zero {
    background: rgba(127, 255, 212, 0.1);
    border: 1px solid rgba(127, 255, 212, 0.2);
    color: #7fffd4;
}

.hviz-bit-first-one {
    background: rgba(53, 255, 107, 0.2);
    border: 1px solid rgba(53, 255, 107, 0.5);
    color: var(--accent-color);
    box-shadow: 0 0 6px rgba(53, 255, 107, 0.3);
}

.hviz-bit-rest {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--muted-text);
}

.hviz-update-badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.72rem;
    font-weight: 700;
    margin-right: 8px;
}

.hviz-update-yes {
    background: rgba(53, 255, 107, 0.15);
    border: 1px solid rgba(53, 255, 107, 0.3);
    color: var(--accent-color);
}

.hviz-update-no {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--muted-text);
}

.hviz-inline-bits {
    display: inline-flex;
    flex-wrap: wrap;
    gap: 1px;
    vertical-align: middle;
}

/* ─────────────────────────────────────────────────────────────────
   PLAYGROUND DETAIL BREAKDOWN (Step 6)
───────────────────────────────────────────────────────────────── */

.hll-detail-breakdown {
    margin: 12px 0;
    padding: 12px 16px;
    border: 1px solid rgba(53, 255, 107, 0.12);
    border-radius: 8px;
    background: rgba(0, 3, 1, 0.96);
    animation: phaseSlideIn 0.3s ease-out;
}

.hll-detail-content {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.76rem;
}

.hll-detail-row {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 4px 0;
    border-bottom: 1px solid rgba(53, 255, 107, 0.05);
}

.hll-detail-row:last-child {
    border-bottom: none;
}

.hll-detail-label {
    min-width: 60px;
    font-size: 0.68rem;
    color: var(--muted-text);
    text-transform: uppercase;
    letter-spacing: 0.4px;
}

.hll-detail-val {
    color: var(--text-color);
}

/* ─────────────────────────────────────────────────────────────────
   REGISTER EXPLAINER ANIMATION (Step 4)
───────────────────────────────────────────────────────────────── */

.reg-ex-breakdown {
    background: rgba(0, 3, 1, 0.96);
    border: 1px solid rgba(53, 255, 107, 0.15);
    border-radius: 10px;
    padding: 14px 18px;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.78rem;
    line-height: 1.7;
}

.reg-ex-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 6px;
    flex-wrap: wrap;
}

.reg-ex-label {
    color: var(--muted-text);
    min-width: 80px;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.4px;
}

.reg-ex-val {
    color: var(--text-color);
}

.reg-ex-highlight {
    display: inline-block;
    padding: 2px 6px;
    border-radius: 4px;
    animation: regExPulse 0.8s ease-out;
}

.reg-ex-bucket-bits {
    background: rgba(154, 255, 87, 0.15);
    color: #9aff57;
    border: 1px solid rgba(154, 255, 87, 0.3);
}

.reg-ex-suffix-bits {
    background: rgba(127, 255, 212, 0.1);
    color: #7fffd4;
    border: 1px solid rgba(127, 255, 212, 0.2);
}

.reg-ex-rho-val {
    background: rgba(53, 255, 107, 0.15);
    color: var(--accent-color);
    border: 1px solid rgba(53, 255, 107, 0.3);
    font-weight: 700;
}

.reg-ex-update-msg {
    margin-top: 8px;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.76rem;
    animation: regExPulse 0.6s ease-out;
}

.reg-ex-update-yes {
    background: rgba(53, 255, 107, 0.1);
    border: 1px solid rgba(53, 255, 107, 0.25);
    color: var(--accent-color);
}

.reg-ex-update-no {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--muted-text);
}

@keyframes regExPulse {
    0% { transform: scale(1.05); opacity: 0.6; }
    100% { transform: scale(1); opacity: 1; }
}

.reg-ex-strip {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
}

.reg-ex-cell {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    padding: 8px 6px;
    border: 1px solid rgba(53, 255, 107, 0.15);
    border-radius: 6px;
    background: rgba(0, 5, 2, 0.9);
    min-width: 58px;
    transition: all 0.3s ease;
}

.reg-ex-cell.reg-ex-active {
    border-color: var(--accent-color);
    background: rgba(53, 255, 107, 0.08);
    box-shadow: 0 0 10px rgba(53, 255, 107, 0.2);
    animation: regExPulse 0.5s ease-out;
}

.reg-ex-cell-idx {
    font-size: 0.62rem;
    color: var(--muted-text);
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.reg-ex-cell-dec {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--accent-color);
    font-family: 'JetBrains Mono', monospace;
}

.reg-ex-cell-bin {
    font-size: 0.62rem;
    color: #7fffd4;
    font-family: 'JetBrains Mono', monospace;
    letter-spacing: 1px;
}

.reg-ex-mem-note {
    font-size: 0.78rem;
    color: var(--text-color);
    padding: 8px 14px;
    background: rgba(53, 255, 107, 0.04);
    border-radius: 6px;
    border: 1px solid rgba(53, 255, 107, 0.1);
}

/* ─────────────────────────────────────────────────────────────────
   ENTRY BREAKDOWN TABLES
───────────────────────────────────────────────────────────────── */

.algo-breakdown-section {
    margin-top: 18px;
}

.algo-breakdown-section h4 {
    font-size: 0.78rem;
    color: var(--accent-color);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.6px;
}

.algo-breakdown-scroll {
    max-height: 260px;
    overflow-y: auto;
    border: 1px solid rgba(53, 255, 107, 0.12);
    border-radius: 8px;
    background: rgba(0, 3, 1, 0.96);
}

.algo-breakdown-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.72rem;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
}

.algo-breakdown-table th {
    position: sticky;
    top: 0;
    background: rgba(2, 6, 13, 0.98);
    color: var(--accent-color);
    font-weight: 600;
    padding: 6px 8px;
    text-align: left;
    border-bottom: 1px solid rgba(53, 255, 107, 0.2);
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 0.4px;
    z-index: 1;
}

.algo-breakdown-table td {
    padding: 5px 8px;
    border-bottom: 1px solid rgba(53, 255, 107, 0.06);
    color: var(--text-color);
    white-space: nowrap;
}

.algo-breakdown-table tr:hover {
    background: rgba(53, 255, 107, 0.04);
}

.algo-breakdown-new {
    animation: breakdownHighlight 1.2s ease-out;
}

@keyframes breakdownHighlight {
    0% { background: rgba(53, 255, 107, 0.18); }
    100% { background: transparent; }
}

.algo-breakdown-empty td {
    text-align: center;
    color: var(--muted-text);
    font-style: italic;
    padding: 20px 8px;
}

.bd-name { color: var(--accent-color); font-weight: 500; }
.bd-hash { color: var(--muted-text); font-size: 0.68rem; }
.bd-bits { color: #9aff57; }
.bd-idx { font-weight: 600; }
.bd-bucket { color: var(--accent-color); font-weight: 700; }
.bd-suffix { color: var(--muted-text); font-size: 0.68rem; }
.bd-rho { color: #7fffd4; font-weight: 600; text-align: center; }
.bd-yes { color: var(--accent-color); font-weight: 600; }
.bd-no { color: var(--muted-text); font-size: 0.68rem; }

/* ─────────────────────────────────────────────────────────────────
   TUTORIAL HELPERS
───────────────────────────────────────────────────────────────── */

.callout {
    padding: 14px 18px;
    border-left: 3px solid var(--accent-color);
    border-radius: 0 10px 10px 0;
    background: rgba(53, 255, 107, 0.06);
    margin: 16px 0;
    color: var(--text-color);
    font-size: 0.92rem;
    line-height: 1.65;
}

.callout strong { color: var(--accent-color); }

.callout.warn {
    border-left-color: var(--warning-color);
    background: rgba(154, 255, 87, 0.06);
}

.callout.warn strong { color: var(--warning-color); }

.inline-formula {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 5px;
    background: rgba(53, 255, 107, 0.08);
    border: 1px solid rgba(53, 255, 107, 0.18);
    color: var(--warning-color);
    font-size: 0.85em;
    font-family: "Courier New", Consolas, monospace;
}

.learn-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.87rem;
    margin: 16px 0;
}

.learn-table th,
.learn-table td {
    padding: 10px 14px;
    border: 1px solid rgba(53, 255, 107, 0.16);
    text-align: left;
}

.learn-table th {
    color: var(--accent-color);
    background: rgba(53, 255, 107, 0.07);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-size: 0.72rem;
}

.learn-table td { color: var(--text-color); }
.learn-table tr:hover td { background: rgba(53, 255, 107, 0.04); }
.learn-table td.hi { color: var(--accent-color); font-weight: 700; }

/* ─────────────────────────────────────────────────────────────────
   RESPONSIVE
───────────────────────────────────────────────────────────────── */

@media (max-width: 640px) {
    .step-nav-cards {
        grid-template-columns: 1fr;
    }
    .step-nav-cards.only-next,
    .step-nav-cards.only-prev {
        grid-template-columns: 1fr;
    }
    .step-btn.next { justify-content: flex-start; text-align: left; }
    .hll-registers { grid-template-columns: repeat(8, 1fr); }
    .pseudo-code { font-size: 0.73rem; }
    .bit { width: 14px; height: 18px; font-size: 0.63rem; }
    .hash-input-row { flex-direction: column; }
    .mem-slider-row label { min-width: 70px; font-size: 0.74rem; }
}