@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;700&family=Outfit:wght@400;600;700;800&display=swap');

:root {
    --bg: #020617;
    --panel: rgba(15, 23, 42, 0.78);
    --border: rgba(255, 255, 255, 0.07);
    --purple: #8b5cf6;
    --blue: #3b82f6;
    --cyan: #22d3ee;
    --green: #4ade80;
    --amber: #fbbf24;
    --red: #f87171;
    --text: #f8fafc;
    --muted: #64748b;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body.sim-page {
    font-family: 'Outfit', sans-serif;
    background: var(--bg);
    color: var(--text);
    overflow: hidden;
    margin: 0;
    padding: 0;
}

#phet-stage {
    position: absolute;
    top: 0;
    left: 0;
    width: 1280px;
    height: 720px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--bg);
    transform-origin: top left;
}

/* NAV */
.vm-nav {
    position: relative !important;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.8rem 2rem;
    background: rgba(15, 23, 42, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    z-index: 200;
}

.logo { font-size: 1rem; font-weight: 800; }

.info-nav-btn {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.15), rgba(59, 130, 246, 0.1));
    border: 1px solid rgba(139, 92, 246, 0.35);
    color: var(--purple);
    padding: 0.35rem 1rem;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 700;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    transition: 0.2s;
    font-family: inherit;
}

.info-nav-btn:hover { background: var(--purple); color: #fff; transform: translateY(-1px); }

/* MAIN */
.vm-main {
    flex: 1;
    width: 100%;
    max-width: 1240px;
    margin: 0 auto;
    padding: 0.5rem 1rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.7rem;
    overflow: hidden;
}

/* ANALOGY BANNER */
.analogy-banner {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.08), rgba(59, 130, 246, 0.06));
    border: 1px solid rgba(139, 92, 246, 0.25);
    border-radius: 14px;
    padding: 0.55rem 1rem;
    display: flex;
    align-items: center;
    gap: 0.7rem;
    flex-wrap: wrap;
}

.analogy-icons { font-size: 1.3rem; flex-shrink: 0; letter-spacing: 0.2rem; }

.analogy-text {
    flex: 1;
    font-size: 0.78rem;
    color: #cbd5e1;
    line-height: 1.45;
    min-width: 200px;
}

.analogy-text strong { color: var(--text); }
.analogy-text em { color: var(--purple); font-style: normal; font-weight: 700; }

.guided-btn {
    background: linear-gradient(135deg, var(--purple), var(--blue));
    color: #fff;
    border: none;
    padding: 0.35rem 0.9rem;
    border-radius: 9px;
    font-size: 0.75rem;
    font-weight: 800;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    transition: 0.3s;
    flex-shrink: 0;
    font-family: inherit;
}

.guided-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(139, 92, 246, 0.35); }

/* CONTROLS BAR */
.controls-bar {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    background: rgba(30, 41, 59, 0.4);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 0.5rem 0.9rem;
}

.ctrl-group { display: flex; align-items: center; gap: 0.4rem; flex-wrap: wrap; }

.bar-label {
    font-size: 0.65rem;
    font-weight: 800;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    white-space: nowrap;
}

.pat-btn, .rep-btn {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--muted);
    padding: 0.25rem 0.7rem;
    border-radius: 7px;
    font-size: 0.76rem;
    font-weight: 700;
    cursor: pointer;
    transition: 0.2s;
    font-family: inherit;
}

.pat-btn:hover  { border-color: var(--purple); color: var(--purple); }
.pat-btn.active { background: var(--purple); border-color: var(--purple); color: #fff; }
.rep-btn:hover  { border-color: var(--amber); color: var(--amber); }
.rep-btn.active { background: var(--amber); border-color: var(--amber); color: #020617; }

.ctrl-btn {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.38rem 0.9rem;
    border-radius: 8px;
    font-size: 0.82rem;
    font-weight: 700;
    cursor: pointer;
    border: none;
    font-family: inherit;
    transition: all 0.2s;
}

.ctrl-btn.step  { background: var(--blue); color: #fff; }
.ctrl-btn.step:hover { background: #2563eb; transform: translateY(-1px); }
.ctrl-btn.auto  { background: var(--green); color: #020617; }
.ctrl-btn.auto:hover { background: #22c55e; transform: translateY(-1px); }
.ctrl-btn.reset { background: rgba(248,113,113,0.1); color: var(--red); border: 1px solid rgba(248,113,113,0.3); }
.ctrl-btn.reset:hover { background: rgba(248,113,113,0.2); }

/* SIM AREA */
.sim-area {
    display: grid;
    grid-template-columns: 240px 1fr 240px;
    gap: 0.7rem;
    align-items: start;
    flex: 1;
    overflow: hidden;
}

/* PANEL BOX */
.panel-box {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 14px;
    backdrop-filter: blur(10px);
}

.panel-title {
    font-size: 0.67rem;
    font-weight: 800;
    color: var(--purple);
    text-transform: uppercase;
    letter-spacing: 1px;
    display: flex;
    align-items: center;
    gap: 0.35rem;
    margin-bottom: 0.5rem;
}

.badge-note {
    background: rgba(139, 92, 246, 0.12);
    color: rgba(139, 92, 246, 0.8);
    border: 1px solid rgba(139, 92, 246, 0.2);
    border-radius: 20px;
    padding: 0.05rem 0.45rem;
    font-size: 0.58rem;
    font-weight: 700;
    margin-left: auto;
}

/* LEFT COL */
.left-col {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    height: 100%;
    overflow-y: auto;
    overflow-x: hidden;
}

.left-col::-webkit-scrollbar { width: 2px; }
.left-col::-webkit-scrollbar-thumb { background: #334155; }

/* VIRTUAL ADDRESS SPACE */
.vspace-panel { padding: 0.65rem 0.75rem; }

.vpages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.3rem;
    margin-bottom: 0.4rem;
}

.vpage-box {
    border-radius: 8px;
    padding: 0.3rem;
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.03);
    text-align: center;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.68rem;
    font-weight: 700;
    color: var(--muted);
    transition: all 0.3s;
    cursor: default;
}

.vpage-box.in-ram {
    background: rgba(139, 92, 246, 0.14);
    border-color: rgba(139, 92, 246, 0.4);
    color: var(--purple);
}

.vpage-box.current-access {
    background: rgba(251, 191, 36, 0.15);
    border-color: rgba(251, 191, 36, 0.5);
    color: var(--amber);
    animation: current-pulse 0.5s ease infinite alternate;
}

@keyframes current-pulse {
    from { transform: scale(1); }
    to   { transform: scale(1.06); box-shadow: 0 0 8px rgba(251,191,36,0.3); }
}

.vspace-note {
    font-size: 0.62rem;
    color: var(--muted);
    text-align: center;
}

/* STATS PANEL */
.stats-panel { padding: 0.6rem 0.7rem; }

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.3rem;
    margin-bottom: 0.4rem;
}

.stat-box {
    border-radius: 8px;
    padding: 0.3rem;
    text-align: center;
    border: 1px solid var(--border);
}

.hit-stat  { background: rgba(74, 222, 128, 0.08);  border-color: rgba(74, 222, 128, 0.2); }
.miss-stat { background: rgba(248, 113, 113, 0.08); border-color: rgba(248, 113, 113, 0.2); }
.rate-stat { background: rgba(139, 92, 246, 0.08);  border-color: rgba(139, 92, 246, 0.2); }
.total-stat { background: rgba(255, 255, 255, 0.03); }

.stat-num { font-family: 'JetBrains Mono', monospace; font-size: 1rem; font-weight: 800; color: var(--purple); }
.hit-stat  .stat-num { color: var(--green); }
.miss-stat .stat-num { color: var(--red); }
.rate-stat .stat-num { color: var(--purple); }
.stat-lbl { font-size: 0.6rem; color: var(--muted); margin-top: 1px; }

.hit-bar-track {
    height: 6px;
    background: rgba(248, 113, 113, 0.2);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 0.25rem;
}

.hit-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--green), var(--purple));
    border-radius: 3px;
    transition: width 0.5s ease;
}

.hit-bar-label { font-size: 0.62rem; color: var(--muted); text-align: center; }

/* LOG PANEL */
.log-panel { padding: 0.6rem 0.7rem; }

.log-body {
    overflow-y: auto;
    max-height: 120px;
    margin-top: 0.35rem;
    scrollbar-width: thin;
    scrollbar-color: var(--cyan) transparent;
}

.log-body::-webkit-scrollbar {
    width: 4px;
}
.log-body::-webkit-scrollbar-track {
    background: transparent;
}
.log-body::-webkit-scrollbar-thumb {
    background: rgba(34, 211, 238, 0.3);
    border-radius: 10px;
}

.log-entry {
    font-size: 0.68rem;
    font-family: 'JetBrains Mono', monospace;
    padding: 0.18rem 0.35rem;
    border-radius: 4px;
    margin-bottom: 2px;
    line-height: 1.4;
}

.log-hit   { color: var(--green); }
.log-fault { color: var(--red); }
.log-info  { color: var(--muted); }

/* CENTER COL */
.center-col {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

/* PAGE TABLE */
.ptable-panel { padding: 0.65rem 0.75rem; }

.ptable-header {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr;
    gap: 0.3rem;
    font-size: 0.62rem;
    font-weight: 800;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 0.3rem 0.5rem;
    border-bottom: 1px solid var(--border);
    margin-bottom: 0.4rem;
}

.pt-row {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr;
    gap: 0.3rem;
    padding: 0.32rem 0.5rem;
    border-radius: 8px;
    font-size: 0.76rem;
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
    margin-bottom: 0.2rem;
    transition: all 0.3s;
    border: 1px solid transparent;
}

.pt-row.valid {
    background: rgba(139, 92, 246, 0.1);
    border-color: rgba(139, 92, 246, 0.2);
}

.pt-row.current {
    background: rgba(251, 191, 36, 0.12);
    border-color: rgba(251, 191, 36, 0.4);
    animation: row-glow 0.5s ease;
}

@keyframes row-glow {
    from { transform: scale(1); }
    50%  { transform: scale(1.01); box-shadow: 0 0 12px rgba(251,191,36,0.2); }
    to   { transform: scale(1); }
}

.pt-row.fault-row {
    background: rgba(248, 113, 113, 0.08);
    border-color: rgba(248, 113, 113, 0.3);
}

.pt-cell { display: flex; align-items: center; }
.pt-vp   { color: var(--cyan); }
.pt-valid-yes { color: var(--green); }
.pt-valid-no  { color: var(--muted); }
.pt-frame { color: var(--purple); }
.pt-status-hit   { color: var(--green); font-size: 0.65rem; }
.pt-status-fault { color: var(--red);   font-size: 0.65rem; }
.pt-status-idle  { color: var(--muted); font-size: 0.65rem; }

/* EXPLAIN PANEL */
.explain-panel { padding: 0.6rem 0.7rem; }

.explain-body {
    font-size: 0.78rem;
    color: #cbd5e1;
    line-height: 1.55;
}

.explain-body strong { color: var(--text); }
.explain-body .hl    { color: var(--purple); font-weight: 700; }
.explain-body .hl-g  { color: var(--green);  font-weight: 700; }
.explain-body .hl-r  { color: var(--red);    font-weight: 700; }
.explain-body .hl-a  { color: var(--amber);  font-weight: 700; }

/* RESULT BADGE */
.result-badge {
    text-align: center;
    padding: 0.35rem 0.8rem;
    border-radius: 10px;
    font-size: 0.82rem;
    font-weight: 800;
    transition: all 0.3s;
}

.result-badge.hit {
    background: rgba(74, 222, 128, 0.12);
    border: 1px solid rgba(74, 222, 128, 0.35);
    color: var(--green);
    opacity: 1 !important;
}

.result-badge.fault {
    background: rgba(248, 113, 113, 0.1);
    border: 1px solid rgba(248, 113, 113, 0.35);
    color: var(--red);
    opacity: 1 !important;
}

/* QUEUE PANEL */
.queue-panel { padding: 0.6rem 0.7rem; }

.queue-list { display: flex; flex-wrap: wrap; gap: 0.3rem; margin-top: 0.35rem; }

.queue-item {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    font-weight: 700;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    padding: 0.18rem 0.45rem;
    border-radius: 6px;
    color: var(--muted);
}

.queue-item.next {
    background: rgba(139, 92, 246, 0.12);
    border-color: rgba(139, 92, 246, 0.35);
    color: var(--purple);
}

/* RIGHT COL */
.right-col {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    height: 100%;
    overflow-y: auto;
    overflow-x: hidden;
}

.right-col::-webkit-scrollbar { width: 2px; }
.right-col::-webkit-scrollbar-thumb { background: #334155; }

/* RAM FRAMES */
.ram-panel { padding: 0.65rem 0.75rem; }

.ram-frame {
    border-radius: 10px;
    padding: 0.5rem 0.7rem;
    border: 2px solid var(--border);
    background: rgba(2, 6, 23, 0.3);
    margin-bottom: 0.35rem;
    transition: all 0.35s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    min-height: 52px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.ram-frame.empty {
    border-style: dashed;
    opacity: 0.45;
    text-align: center;
}

.ram-frame.empty .frame-empty-lbl {
    font-size: 0.68rem;
    color: var(--muted);
}

.ram-frame.loaded {
    animation: frame-in 0.35s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes frame-in {
    from { transform: scale(0.92); opacity: 0.5; }
    to   { transform: scale(1);    opacity: 1; }
}

.ram-frame.hit-flash { animation: frame-hit 0.45s ease; }

@keyframes frame-hit {
    0%  { box-shadow: 0 0 0 0 rgba(74, 222, 128, 0.6); }
    50% { box-shadow: 0 0 0 8px rgba(74, 222, 128, 0); transform: scale(1.03); }
    100%{ box-shadow: none; }
}

.frame-idx {
    font-size: 0.58rem;
    font-weight: 800;
    color: var(--muted);
    text-transform: uppercase;
    margin-bottom: 0.15rem;
}

.frame-page-num {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1rem;
    font-weight: 800;
    line-height: 1;
    margin-bottom: 0.1rem;
}

.frame-tag {
    font-size: 0.6rem;
    opacity: 0.5;
}

.frame-evict-badge {
    font-size: 0.55rem;
    font-weight: 800;
    padding: 0.08rem 0.3rem;
    border-radius: 4px;
    background: rgba(248, 113, 113, 0.2);
    color: var(--red);
    width: fit-content;
    margin-top: 0.15rem;
}

.speed-note {
    font-size: 0.62rem;
    color: var(--muted);
    text-align: center;
    margin-top: 0.3rem;
    font-weight: 600;
}

/* DISK */
.disk-panel { padding: 0.65rem 0.75rem; }

.disk-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.28rem;
}

.disk-block {
    aspect-ratio: 1;
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.06);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.65rem;
    font-weight: 700;
    color: var(--muted);
    transition: all 0.3s;
}

.disk-block.in-ram {
    background: rgba(139, 92, 246, 0.1);
    border-color: rgba(139, 92, 246, 0.3);
    color: var(--purple);
}

.disk-block.loading {
    background: rgba(251, 191, 36, 0.14);
    border-color: rgba(251, 191, 36, 0.5);
    color: var(--amber);
    animation: disk-load 0.5s ease infinite alternate;
}

@keyframes disk-load {
    from { transform: scale(1); }
    to   { transform: scale(1.1); box-shadow: 0 0 6px rgba(251,191,36,0.3); }
}

/* GUIDED DEMO */
.demo-overlay {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 999;
    width: 100%;
    max-width: 480px;
    padding: 0 16px;
    animation: demo-up 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes demo-up {
    from { transform: translateX(-50%) translateY(30px); opacity: 0; }
    to   { transform: translateX(-50%) translateY(0);    opacity: 1; }
}

.demo-card {
    background: linear-gradient(135deg, #1e293b, #0f172a);
    border: 2px solid rgba(139, 92, 246, 0.4);
    border-radius: 20px;
    padding: 1.1rem 1.4rem;
    box-shadow: 0 20px 50px rgba(0,0,0,0.6);
}

.demo-step-ind { font-size: 0.62rem; font-weight: 800; color: var(--purple); letter-spacing: 2px; text-transform: uppercase; margin-bottom: 0.25rem; }
.demo-title    { font-size: 1rem; font-weight: 800; color: var(--text); margin-bottom: 0.35rem; }
.demo-body     { font-size: 0.82rem; color: #94a3b8; line-height: 1.65; margin-bottom: 0.9rem; }
.demo-body strong { color: var(--text); }
.demo-actions  { display: flex; gap: 0.7rem; }

/* INFO MODAL */
.info-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(2, 6, 23, 0.82);
    backdrop-filter: blur(8px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    animation: mfade 0.25s ease;
}

.info-modal-overlay.hidden { display: none; }

@keyframes mfade { from { opacity: 0; } to { opacity: 1; } }

.info-modal-box {
    background: linear-gradient(145deg, #1e293b, #0f172a);
    border: 1px solid rgba(139, 92, 246, 0.2);
    border-radius: 22px;
    padding: 1.6rem;
    width: 100%;
    max-width: 640px;
    max-height: 85vh;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 30px 80px rgba(0,0,0,0.7);
    animation: mslide 0.35s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes mslide {
    from { transform: translateY(30px); opacity: 0; }
    to   { transform: translateY(0);    opacity: 1; }
}

.info-modal-close {
    position: absolute;
    top: 1rem; right: 1rem;
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    color: var(--muted);
    width: 30px; height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: 0.2s;
    font-size: 0.8rem;
}

.info-modal-close:hover { background: var(--red); color: #fff; border-color: var(--red); }

.info-modal-header { display: flex; align-items: center; gap: 1rem; margin-bottom: 1rem; }
.info-modal-icon   { font-size: 2rem; }
.info-modal-title  { font-size: 1.1rem; font-weight: 800; color: var(--text); }
.info-modal-subtitle { font-size: 0.72rem; color: var(--muted); margin-top: 0.1rem; }

.why-tabs {
    display: flex;
    gap: 0.35rem;
    flex-wrap: wrap;
    margin-bottom: 0.9rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.5rem;
}

.why-tab {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--muted);
    padding: 0.26rem 0.7rem;
    border-radius: 7px;
    font-size: 0.75rem;
    font-weight: 700;
    cursor: pointer;
    transition: 0.2s;
    font-family: inherit;
}

.why-tab:hover  { color: var(--purple); border-color: var(--purple); }
.why-tab.active { background: var(--purple); border-color: var(--purple); color: #fff; }

.why-section { display: none; }
.why-section.active { display: block; }

.why-section p { font-size: 0.83rem; color: #94a3b8; line-height: 1.6; margin-bottom: 0.55rem; }
.why-section p strong { color: var(--text); }

.modal-big-analogy {
    background: rgba(139, 92, 246, 0.07);
    border: 1px solid rgba(139, 92, 246, 0.15);
    border-radius: 14px;
    padding: 1rem;
    text-align: center;
    margin-bottom: 0.8rem;
}

.modal-big-analogy p { color: var(--text); font-size: 0.88rem; margin: 0; }

.step-list { display: flex; flex-direction: column; gap: 0.45rem; margin: 0.5rem 0; }

.step-item {
    display: flex;
    align-items: flex-start;
    gap: 0.55rem;
    font-size: 0.79rem;
    color: #94a3b8;
    line-height: 1.5;
}

.step-num {
    background: rgba(139,92,246,0.15);
    color: var(--purple);
    border-radius: 50%;
    width: 24px; height: 24px;
    min-width: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.72rem;
    font-weight: 800;
}

.step-item strong { color: var(--text); }

.hm-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.7rem;
    margin: 0.7rem 0;
}

.hm-card {
    border-radius: 12px;
    padding: 0.85rem;
    text-align: center;
    border: 1px solid;
}

.hit-card  { background: rgba(74,222,128,0.07);  border-color: rgba(74,222,128,0.25); }
.miss-card { background: rgba(248,113,113,0.07); border-color: rgba(248,113,113,0.25); }

.hm-icon  { font-size: 1.6rem; margin-bottom: 0.35rem; }
.hm-title { font-size: 0.85rem; font-weight: 800; margin-bottom: 0.25rem; color: var(--text); }
.hm-desc  { font-size: 0.75rem; color: #94a3b8; line-height: 1.45; }
.hm-desc strong { color: var(--text); }

.real-list { display: flex; flex-direction: column; gap: 0.55rem; margin-top: 0.4rem; }

.re-item { display: flex; align-items: flex-start; gap: 0.55rem; font-size: 0.78rem; color: #94a3b8; line-height: 1.5; }
.re-item strong { color: var(--text); }
.re-icon { font-size: 1.1rem; flex-shrink: 0; }

.info-modal-box::-webkit-scrollbar { width: 3px; }
.info-modal-box::-webkit-scrollbar-thumb { background: #334155; border-radius: 10px; }