/* Variables */
:root {
    --bg:           #0a0a0c;
    --bg-noise:     url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='200' height='200' filter='url(%23n)' opacity='0.035'/%3E%3C/svg%3E");
    --s1:           #111114;
    --s2:           #18181c;
    --s3:           #1f1f24;
    --border:       #28282e;
    --border-soft:  rgba(255, 255, 255, 0.05);

    --green:        #4caf6e;
    --green-dim:    #2e6b43;
    --green-glow:   rgba(76, 175, 110, 0.18);
    --yellow:       #c8a22a;
    --yellow-dim:   #7a6018;
    --yellow-glow:  rgba(200, 162, 42, 0.18);
    --gray:         #3a3a42;
    --gray-dim:     #2a2a30;

    --text:         #eeeef2;
    --text-dim:     #7b7b88;
    --text-muted:   #44444e;
    --accent:       #4f8ef7;
    --accent-dim:   rgba(79, 142, 247, 0.15);
    --star:         #f0c535;

    --font-ui:      'DM Sans', system-ui, sans-serif;
    --font-mono:    'JetBrains Mono', 'Courier New', monospace;

    --radius:       6px;
    --radius-lg:    12px;
    --radius-xl:    16px;
    --tile:         88px;
    --gap:          5px;
    --transition:   160ms ease;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 18px; scroll-behavior: smooth; }

body {
    font-family: var(--font-ui);
    background-color: var(--bg);
    background-image: var(--bg-noise);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
}

/* Header */
header {
    background: var(--s1);
    border-bottom: 1px solid var(--border);
    height: 70px;
    flex-shrink: 0;
    position: sticky;
    top: 0;
    z-index: 10;
}
.header-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1.5rem;
    height: 100%;
    display: flex;
    align-items: center;
    gap: 0.875rem;
}
.brand { display: flex; align-items: center; gap: 0.625rem; }
.brand-tiles { display: flex; gap: 3px; }
.btile {
    width: 22px; height: 22px;
    border-radius: 3px;
    font-family: var(--font-mono);
    font-weight: 800;
    font-size: 0.65rem;
    display: flex; align-items: center; justify-content: center;
    color: #fff;
    letter-spacing: 0;
}
.btile.green {  background: var(--green); }
.btile.yellow { background: var(--yellow); }

.brand-name {
    font-weight: 700;
    font-size: 1rem;
    letter-spacing: -0.01em;
    color: var(--text);
}
.brand-sub {
    font-size: 0.7rem;
    color: var(--text-muted);
    display: block;
    margin-top: 1px;
}

.btn-ghost {
    margin-left: auto;
    background: transparent;
    color: var(--text-dim);
    border: 1px solid var(--border);
    padding: 0.38rem 0.875rem;
    border-radius: var(--radius);
    font-family: var(--font-ui);
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}
.btn-ghost:hover { border-color: var(--text-muted); color: var(--text); }

/* Main Layout */
main {
    max-width: 1120px;
    width: 100%;
    margin: 0 auto;
    padding: 1.25rem 1.5rem 2rem;
    display: grid;
    grid-template-columns: 460px 1fr;
    gap: 1.25rem;
    flex: 1;
    align-items: start;
}

.col { display: flex; flex-direction: column; gap: 1rem; }

/* Status Strip */
.status-strip {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 0.75rem;
    background: var(--s2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.8rem;
    gap: 0.5rem;
}
#remaining-label strong { color: var(--accent); font-weight: 700; }
#remaining-label { color: var(--text-dim); }

/* Pills */
.pill {
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    padding: 0.18rem 0.55rem;
    border-radius: 20px;
    white-space: nowrap;
}
.pill.entropy   { background: var(--accent-dim);    color: var(--accent);       border: 1px solid rgba(79, 142, 147, 0.25);}
.pill.frequency { background: var(--green-glow);    color: var(--green);        border: 1px solid rgba(76, 175, 110, 0.25); }
.pill.loading   { background: var(--s3);            color: var(--text-muted);   border: 1px solid var(--border); }

.pill-sm { font-size: 0.65rem; padding: 0.12rem 0.4rem; }

/* Guess Grid */
.guess-grid {
    display: flex;
    margin: 0 auto;
    align-self: center;
    flex-direction: column;
    gap: var(--gap);
}
.grid-row { display: flex; justify-content: center; gap: var(--gap); }

/* Shared tile base */
.tile {
    width: var(--tile);
    height: var(--tile);
    border-radius: var(--radius);
    border: 2px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.02em;
    background: var(--s2);
    color: var(--text);
    user-select: none;
    transition: background var(--transition), border-color var(--transition);
}
.tile.filled    { border-color: var(--text-muted); }
.tile.green     { background:   var(--green);     border-color: var(--green);     color: #fff; }
.tile.yellow    { background:   var(--yellow);    border-color: var(--yellow);    color: #fff; }
.tile.gray      { background:   var(--gray);      border-color: var(--gray);      color: var(--text-dim); }

/* Tile flip on submit */
@keyframes flip {
    0% { transform: scaleY(1); }
    40% { transform: scaleY(0); }
    60% { transform: scaleY(0); }
    100% { transform: scaleY(1); }
}
.tile.flip { animation: flip 420ms ease forwards; }

/* Pop on type */
@keyframes pop {
    0% { transform: scale(1); }
    50% { transform: scale(1.09); }
    100% { transform: scale(1); }
}
.tile.pop { animation: pop 100ms ease; }

/* Input Card */
.input-card {
    background: var(--s2);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 0.875rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}
.input-row { display: flex; gap: 0.5rem; }

#guess-input {
    flex: 1;
    background: var(--s3);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    font-family: var(--font-mono);
    font-size: 1.2rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    padding: 0.5rem 0.75rem;
    outline: none;
    transition: border-color var(--transition), box-shadow var(--transition);
    caret-color: var(--accent);
}
#guess-input::placeholder {
    font-family: var(--font-ui);
    font-size: 0.8rem;
    font-weight: 400;
    letter-spacing: normal;
    color: var(--text-muted);
    text-transform: none;
}
#guess-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-dim);
}

.btn-primary {
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 0.5rem 1.125rem;
    border-radius: var(--radius);
    font-family: var(--font-ui);
    font-weight: 700;
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
    letter-spacing: 0.02em;
}
.btn-primary:hover:not(:disabled) { background: #3d7de8; }
.btn-primary:active:not(:disabled) { transform: scale(0.97); }
.btn-primary:disabled { opacity: 0.35; cursor: not-allowed; }

/* Clickable color tiles */
.color-tiles {
    display: flex;
    gap: var(--gap);
    justify-content: center;
}

.ctile {
    width: var(--tile);
    height: var(--tile);
    border-radius: var(--radius);
    border: 2px solid var(--border);
    background: var(--s3);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.02em;
    color: var(--text);
    transition: border-color 120ms, background 120ms, transform 80ms;
    position: relative;
    user-select: none;
}
.ctile:hover { border-color: var(--text-muted); transform: scale(1.06); }
.ctile:active { transform: scale(0.96); }

.ctile[data-color="G"] { background: var(--green);  border-color: var(--green);     color: #fff; box-shadow: 0 0 12px var(--green-glow); }
.ctile[data-color="Y"] { background: var(--yellow); border-color: var(--yellow);    color: #fff; box-shadow: 0 0 12px var(--yellow-glow); }
.ctile[data-color="X"] { background: var(--gray);   border-color: var(--gray);      color: var(--text-dim); }
.ctile:not([data-letter]) { opacity: 0.35 ; pointer-events: none; }

.color-hint {
    font-size: 0.7rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.25rem;
    flex-wrap: wrap;
}
.swatch {
    display: inline-block;
    width: 10px; height: 10px;
    border-radius: 2px;
    vertical-align: middle;
    margin-left: 4px;
}
.green-swatch   { background: var(--green); }
.yellow-swatch  { background: var(--yellow); }
.gray-swatch    { background: var(--gray); }

/* Keyboard */
.keyboard {
    background: var(--s2);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 0.75rem 0.625rem;
    display: flex;
    flex-direction: column;
    gap: 5px;
}
.key-row {
    display: flex;
    justify-content: center;
    gap: 4px;
}
.key {
    height: 36px;
    min-width: 28px;
    padding: 0 5px;
    border-radius: 4px;
    background: var(--s3);
    border: 1px solid var(--border);
    color: var(--text-dim);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    display: flex; align-items: center; justify-content: center;
    transition: background 300ms, border-color 300ms, color 300ms;
    user-select: none;
}
.key.green  { background: var(--green-dim);     border-color: var(--green);     color: var(--green); }
.key.yellow { background: var(--yellow-dim);    border-color: var(--yellow);    color: var(--yellow); }
.key.gray   { background: var(--bg);            border-color: var(--bg);        color: var(--text-muted); }

/* Cards */
.card {
    background: var(--s1);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    overflow: hidden;
}
.card-head {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 0.625rem;
    min-height: 46px;
}
.card-title {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-dim);
}
.card-meta {
    font-size: 0.68rem;
    color: var(--text-muted);
    margin-left: auto;
}
#scoring-pill { margin-left: auto; }

/* Recommendations */
.rec-body { padding: 0; }

.spinner-wrap {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.625rem;
    padding: 2.5rem 1rem;
    color: var(--text-muted);
    font-size: 0.8rem;
}
.spinner {
    width: 16px; height: 16px;
    border: 2px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 700ms linear infinite;
    flex-shrink: 0;
}
@keyframes spin { to { transform: rotate(360deg); } }
.spinner-label { color: var(--text-muted); }

/* Rec Table */
.rec-table {
    width: 100%;
    border-collapse: collapse;
}
.rec-table th {
    padding: 0.35rem 0.875rem;
    text-align: left;
    font-size: 0.63rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.09em;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
}
.rec-table th.r, .rec-table td.r { text-align: right; }
.rec-table th.title-entropy { color: var(--accent); }
.rec-table th.title-exp     { color: var(--text-muted); }

.rec-row { border-bottom: 1px solid var(--border-soft); }
.rec-row:last-child { border-bottom: none; }
.rec-row:hover { background: rgba(255, 255, 255, 0.024); }

.rec-row td { padding: 0.6rem 0.875rem; vertical-align: middle; }
.rec-row td:first-child { padding-right: 0.25rem; width: 28px; }

.td-rank {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    color: var(--text-muted);
}
.td-word {
    display: flex;
    align-items: center;
    gap: 5px;
}
.word-text {
    font-family: var(--font-mono);
    font-size: 1rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text);
}
.word-star {
    color: var(--star);
    font-size: 0.7rem;
    line-height: 1;
}
.td-entropy { color: var(--accent);     font-family: var(--font-mono); font-size: 0.85rem; font-weight: 600;    font-variant-numeric: tabular-nums; }
.td-exp     { color: var(--text-dim);   font-family: var(--font-mono); font-size: 0.82rem;                      font-variant-numeric: tabular-nums; }
.td-worst   { color: var(--text-muted); font-family: var(--font-mono); font-size: 0.82rem;                      font-variant-numeric: tabular-nums; }
.td-freq    { color: var(--accent);     font-family: var(--font-mono); font-size: 0.82rem;                      font-variant-numeric: tabular-nums; }

/* Rec legend */
.rec-legend {
    padding: 0.5rem 0.875rem;
    font-size: 0.67rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border-soft);
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}
.rec-legend span { display: flex; align-items: center; gap: 4px; }
.legend-star { color: var(--star); }

/* Frequency Chart */
.freq-chart {
    padding: 0.625rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 4px;
    max-height: 360px;
    overflow-y: auto;
}
.freq-row {
    display: grid;
    grid-template-columns: 16px 1fr 38px;
    align-items: center;
    gap: 0.5rem;
    height: 18px;
}
.freq-letter {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    font-weight: 700;
    color: var(--text-dim);
    text-align: right;
    text-transform: uppercase;
}
.freq-track {
    height: 7px;
    background: var(--s3);
    border-radius: 4px;
    overflow: hidden;
}
.freq-bar {
    height: 100%;
    border-radius: 4px;
    min-width: 2px;
    transition: width 500ms cubic-bezier(0.25, 1, 0.5, 1);
}
.freq-bar.tier-high { background: var(--green); }
.freq-bar.tier-mid  { background: var(--yellow); }
.freq-bar.tier-low  { background: var(--accent); }
.freq-pct {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-muted);
    text-align: right;
    font-variant-numeric: tabular-nums;
}

/* Scrollbar */
.freq-chart::-webkit-scrollbar { width: 4px; }
.freq-chart::-webkit-scrollbar-track { background: transparent; }
.freq-chart::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

/* Solved Overlay */
.solved-overlay {
    position: fixed;
    inset: 0;
    background: rgba(10, 10, 12, 0.85);
    backdrop-filter: blur(6px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    animation: fadeIn 300ms ease;
}
.solved-overlay.hidden { display: none; }

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

.solved-box {
    background: var(--s2);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 2.5rem 3rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    animation: slideUp 320ms cubic-bezier(0.34, 1.56, 0.64, 1);
}
@keyframes slideUp { from { transform: translateY(24px); opacity: 0;} to { transform: none; opacity: 1; } }

.solved-emoji   { font-size: 3rem; line-height: 1; }
.solved-title   { font-size: 1.75rem; font-weight: 800; letter-spacing: -0.02em; }
.solved-sub     { font-size: 0.9rem; color: var(--text-dim); margin-bottom: 0.5rem; }

/* Responsive */
@media (max-width: 820px) {
    main {
        grid-template-columns: 1fr;
        padding: 1rem;
    }
    .col-right { order: -1; }
    :root { --tile: 40px; }
    .btile { display: none; }
}

@media (max-width: 480px) {
    :root { --tile: 40px; }
    .header-inner { padding: 0 1rem; }
    main { padding: 0.75rem; }
    .solved-box { padding: 2rem 1.5rem; }
}