/* Puzzle modes + ladder (uses concept.css tokens). Prefixed so it outranks concept.css tiles. */

:root .puzzle-page .puzzle-modes {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 4px;
    padding: 4px;
    border-radius: 10px;
    background: var(--ch-surface);
    box-shadow: var(--ch-tile-shadow, none);
}

:root .puzzle-page .puzzle-mode {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    min-height: 40px;
    padding: 8px 6px;
    border-radius: 7px;
    color: var(--ch-muted);
    font-size: 0.875rem;
    font-weight: 700;
    text-decoration: none;
    transition: background 0.15s ease, color 0.15s ease;
}

:root .puzzle-page .puzzle-mode svg {
    width: 17px;
    height: 17px;
    flex: none;
}

:root .puzzle-page .puzzle-mode:hover {
    color: var(--ch-text);
    background: var(--ch-surface-2);
}

:root .puzzle-page .puzzle-mode.is-active {
    color: #fff;
    background: var(--ch-orange);
    box-shadow: inset 0 -3px 0 var(--ch-orange-lo), 0 1px 0 rgba(0, 0, 0, 0.2);
}

/* ---------- Ladder card ---------- */

:root .puzzle-page .puzzle-panel .ladder-card {
    --tier-color: #9a6a3f;
    order: 2;
    position: relative;
    display: grid;
    grid-template-columns: 76px 1fr;
    gap: 6px 14px;
    align-items: center;
    padding: 14px;
    overflow: hidden;
    background:
        radial-gradient(130% 150% at 0% 0%, color-mix(in srgb, var(--tier-color) 26%, transparent), transparent 62%),
        var(--ch-surface);
    border: 1px solid color-mix(in srgb, var(--tier-color) 30%, var(--ch-line));
}

:root .puzzle-page .puzzle-panel .ladder-card[hidden] {
    display: none;
}

:root .puzzle-page .ladder-card-crest {
    width: 76px;
    height: 84px;
    padding: 0;
    border: 0;
    background: none;
    cursor: pointer;
    filter: drop-shadow(0 6px 10px rgba(0, 0, 0, 0.35));
    transition: transform 0.18s ease;
}

:root .puzzle-page .ladder-card-crest:hover {
    transform: translateY(-2px) scale(1.03);
}

:root .puzzle-page .ladder-card-crest span,
:root .puzzle-page .ladder-card-crest .ladder-crest {
    display: block;
    width: 100%;
    height: 100%;
}

:root .puzzle-page .ladder-card-info {
    min-width: 0;
}

:root .puzzle-page .ladder-card-kicker {
    margin: 0;
    color: var(--ch-muted);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

:root .puzzle-page .ladder-card-name {
    margin: 2px 0 8px;
    color: var(--ch-text);
    font-size: 1.35rem;
    font-weight: 800;
    line-height: 1.2;
}

:root .puzzle-page .ladder-progress {
    position: relative;
    height: 10px;
    border-radius: 999px;
    background: var(--ch-surface-3);
    overflow: hidden;
}

:root .puzzle-page .ladder-progress-fill {
    position: relative;
    width: 0;
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, color-mix(in srgb, var(--tier-color) 70%, #000), var(--tier-color));
    transition: width 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

:root .puzzle-page .ladder-progress-fill::after {
    content: "";
    position: absolute;
    inset: 0 0 50% 0;
    border-radius: inherit;
    background: rgba(255, 255, 255, 0.22);
}

:root .puzzle-page .ladder-card-foot {
    display: flex;
    justify-content: space-between;
    gap: 8px;
    margin-top: 6px;
    color: var(--ch-muted);
    font-size: 0.78rem;
}

:root .puzzle-page .ladder-card-foot strong {
    color: var(--ch-text);
}

:root .puzzle-page .ladder-card-actions {
    grid-column: 1 / -1;
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 6px;
}

:root .puzzle-page .ladder-card-view {
    flex: 1 1 auto;
    min-height: 38px;
    border: 1px solid var(--ch-line);
    border-radius: 8px;
    background: var(--ch-surface-2);
    color: var(--ch-text);
    font-size: 0.85rem;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.15s ease;
}

:root .puzzle-page .ladder-card-view:hover {
    background: var(--ch-surface-3);
}

:root .puzzle-page .ladder-delta {
    position: absolute;
    top: 12px;
    right: 12px;
    padding: 3px 9px;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 800;
    opacity: 0;
    pointer-events: none;
}

:root .puzzle-page .ladder-delta.is-up { background: rgba(95, 154, 73, 0.2); color: #7cc35f; }
:root .puzzle-page .ladder-delta.is-down { background: rgba(194, 74, 63, 0.2); color: #e26a5d; }
:root .puzzle-page .ladder-delta.is-flat { background: var(--ch-surface-3); color: var(--ch-muted); }

:root .puzzle-page .ladder-delta.is-show {
    animation: ladderDelta 2.4s ease forwards;
}

/* ---------- Start clock overlay ---------- */

:root .puzzle-page .board-wrapper.is-ladder-ready #puzzleBoard {
    filter: blur(7px);
    transform: scale(1.03);
    pointer-events: none;
}

:root .puzzle-page .ladder-start {
    position: absolute;
    inset: 4px;
    z-index: 6;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
    border-radius: 4px;
    background: rgba(10, 10, 10, 0.46);
}

:root .puzzle-page .ladder-start[hidden] {
    display: none !important;
}

:root .puzzle-page .ladder-start-card {
    width: min(280px, 100%);
    padding: 18px 16px 14px;
    border: 1px solid var(--ch-line);
    border-radius: 14px;
    background: var(--ch-surface);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
    text-align: center;
}

:root .puzzle-page .ladder-start-kicker {
    margin: 0;
    color: var(--ch-muted);
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

:root .puzzle-page .ladder-start-title {
    margin: 4px 0 0;
    color: var(--ch-text);
    font-size: 1.45rem;
    font-weight: 900;
    line-height: 1.15;
}

:root .puzzle-page .ladder-start-clock {
    margin: 8px 0 14px;
    color: var(--ch-orange);
    font-size: 1.05rem;
    font-weight: 800;
    font-variant-numeric: tabular-nums;
}

:root .puzzle-page .ladder-start-card .puzzle-btn {
    width: 100%;
    min-height: 44px;
}

:root .puzzle-page .ladder-start-hint {
    margin: 10px 0 0;
    color: var(--ch-muted);
    font-size: 0.75rem;
}

:root .puzzle-page .ladder-start-hint kbd {
    display: inline-block;
    margin: 0 2px;
    padding: 1px 5px;
    border: 1px solid var(--ch-line);
    border-radius: 4px;
    background: var(--ch-surface-2);
    font-family: inherit;
    font-size: 0.7rem;
}

@keyframes ladderDelta {
    0% { opacity: 0; transform: translateY(8px) scale(0.9); }
    12% { opacity: 1; transform: translateY(0) scale(1.08); }
    22% { transform: scale(1); }
    80% { opacity: 1; }
    100% { opacity: 0; transform: translateY(-6px); }
}

/* Filter sub-groups */
:root .puzzle-page .puzzle-filter-sublabel {
    display: block;
    margin: 10px 0 6px;
    color: var(--ch-muted);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

/* ---------- Overlays ---------- */

body.ladder-open {
    overflow: hidden;
}

:root .puzzle-page .ladder-overlay {
    position: fixed;
    inset: 0;
    z-index: 10050;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
    background: rgba(0, 0, 0, 0.62);
    backdrop-filter: blur(3px);
    animation: ladderFade 0.18s ease;
}

:root .puzzle-page .ladder-overlay[hidden] {
    display: none;
}

@keyframes ladderFade {
    from { opacity: 0; }
}

:root .puzzle-page .ladder-sheet {
    display: flex;
    flex-direction: column;
    width: min(560px, 100%);
    max-height: min(88vh, 900px);
    border-radius: 12px;
    background: var(--ch-bg);
    color: var(--ch-text);
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.5);
    overflow: hidden;
    animation: ladderRise 0.24s cubic-bezier(0.22, 1, 0.36, 1);
}

@keyframes ladderRise {
    from { transform: translateY(24px); opacity: 0; }
}

:root .puzzle-page .ladder-sheet-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    padding: 18px 18px 12px;
    background: var(--ch-surface);
    border-bottom: 1px solid var(--ch-line);
}

:root .puzzle-page .ladder-sheet-kicker {
    margin: 0;
    color: var(--ch-orange);
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

:root .puzzle-page .ladder-sheet-title {
    margin: 2px 0 0;
    font-size: 1.15rem;
    font-weight: 800;
}

:root .puzzle-page .ladder-close {
    display: grid;
    place-items: center;
    flex: none;
    width: 36px;
    height: 36px;
    border: 0;
    border-radius: 8px;
    background: var(--ch-surface-2);
    color: var(--ch-text);
    cursor: pointer;
}

:root .puzzle-page .ladder-close svg {
    width: 16px;
    height: 16px;
}

:root .puzzle-page .ladder-sheet-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    padding: 12px 18px;
    background: var(--ch-surface);
}

:root .puzzle-page .ladder-stat {
    padding: 8px 6px;
    border-radius: 8px;
    background: var(--ch-surface-2);
    text-align: center;
}

:root .puzzle-page .ladder-stat span {
    display: block;
    color: var(--ch-muted);
    font-size: 0.66rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

:root .puzzle-page .ladder-stat strong {
    display: block;
    margin-top: 2px;
    font-size: 0.9rem;
    font-weight: 800;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Placement */
:root .puzzle-page .ladder-place {
    padding: 16px 18px 6px;
}

:root .puzzle-page .ladder-place[hidden] {
    display: none;
}

:root .puzzle-page .ladder-place-title {
    margin: 0;
    font-size: 1rem;
    font-weight: 800;
}

:root .puzzle-page .ladder-place-copy {
    margin: 4px 0 12px;
    color: var(--ch-muted);
    font-size: 0.82rem;
}

:root .puzzle-page .ladder-place-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 8px;
}

:root .puzzle-page .ladder-place-opt {
    display: grid;
    grid-template-columns: 38px 1fr;
    grid-template-rows: auto auto;
    column-gap: 10px;
    align-items: center;
    padding: 10px;
    border: 1px solid var(--ch-line);
    border-radius: 8px;
    background: var(--ch-surface);
    color: var(--ch-text);
    text-align: left;
    cursor: pointer;
    transition: border-color 0.15s ease, transform 0.15s ease;
}

:root .puzzle-page .ladder-place-opt:hover {
    border-color: var(--tier-color);
    transform: translateY(-1px);
}

:root .puzzle-page .ladder-place-opt.is-active {
    border-color: var(--ch-orange);
    box-shadow: inset 0 0 0 1px var(--ch-orange);
}

:root .puzzle-page .ladder-place-opt .ladder-crest {
    grid-row: 1 / 3;
    width: 38px;
    height: 42px;
}

:root .puzzle-page .ladder-place-label {
    font-size: 0.88rem;
    font-weight: 800;
}

:root .puzzle-page .ladder-place-meta {
    color: var(--ch-muted);
    font-size: 0.74rem;
}

/* Path */
:root .puzzle-page .ladder-path {
    flex: 1 1 auto;
    margin: 0;
    padding: 12px 18px 16px;
    list-style: none;
    overflow-y: auto;
    overscroll-behavior: contain;
}

:root .puzzle-page .ladder-tier {
    --tier-color: #9a6a3f;
    position: relative;
    display: grid;
    grid-template-columns: 52px 1fr;
    gap: 14px;
    align-items: center;
    padding: 10px 12px;
    border: 1px solid transparent;
    border-radius: 10px;
}

:root .puzzle-page .ladder-tier + .ladder-tier {
    margin-top: 6px;
}

:root .puzzle-page .ladder-tier:not(:last-child)::after {
    content: "";
    position: absolute;
    left: 37px;
    bottom: -12px;
    width: 4px;
    height: 20px;
    border-radius: 2px;
    background: var(--ch-surface-3);
}

:root .puzzle-page .ladder-tier.is-done::before,
:root .puzzle-page .ladder-tier.is-current::before {
    content: "";
    position: absolute;
    left: 37px;
    top: -12px;
    width: 4px;
    height: 20px;
    border-radius: 2px;
    background: color-mix(in srgb, var(--tier-color) 70%, transparent);
}

:root .puzzle-page .ladder-tier.is-current {
    border-color: color-mix(in srgb, var(--tier-color) 55%, transparent);
    background: color-mix(in srgb, var(--tier-color) 14%, var(--ch-surface));
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--tier-color) 14%, transparent);
}

:root .puzzle-page .ladder-tier.is-done {
    background: var(--ch-surface);
}

:root .puzzle-page .ladder-tier.is-locked {
    background: color-mix(in srgb, var(--ch-surface) 55%, transparent);
}

:root .puzzle-page .ladder-tier-crest .ladder-crest {
    display: block;
    width: 52px;
    height: 58px;
    filter: drop-shadow(0 3px 5px rgba(0, 0, 0, 0.3));
}

:root .puzzle-page .ladder-tier.is-locked .ladder-tier-crest .ladder-crest {
    filter: grayscale(0.85);
}

:root .puzzle-page .ladder-tier-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 8px;
}

:root .puzzle-page .ladder-tier-head strong {
    min-width: 0;
    font-size: 0.95rem;
    font-weight: 800;
    line-height: 1.2;
}

:root .puzzle-page .ladder-tier.is-locked .ladder-tier-head strong {
    color: var(--ch-muted);
}

:root .puzzle-page .ladder-tier-head span {
    flex: none;
    color: var(--ch-muted);
    font-size: 0.75rem;
    font-variant-numeric: tabular-nums;
}

:root .puzzle-page .ladder-tier-nodes {
    display: flex;
    align-items: center;
}

:root .puzzle-page .ladder-node {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    flex: none;
}

:root .puzzle-page .ladder-node-dot {
    position: relative;
    z-index: 1;
    display: grid;
    place-items: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--ch-surface-3);
    color: var(--ch-muted);
    font-size: 0.8rem;
    font-weight: 800;
}

:root .puzzle-page .ladder-node-dot svg {
    width: 16px;
    height: 16px;
}

:root .puzzle-page .ladder-node.is-done .ladder-node-dot {
    background: var(--tier-color);
    color: #fff;
}

:root .puzzle-page .ladder-node.is-current .ladder-node-dot {
    background: var(--tier-color);
    color: #fff;
    box-shadow: 0 0 0 3px var(--ch-bg), 0 0 14px color-mix(in srgb, var(--tier-color) 70%, transparent);
}

:root .puzzle-page .ladder-node-ring {
    position: absolute;
    top: -5px;
    left: 50%;
    width: 42px;
    height: 42px;
    margin-left: -21px;
    border-radius: 50%;
    background: conic-gradient(var(--tier-color) calc(var(--p, 0) * 1%), var(--ch-surface-3) 0);
    -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 3px), #000 calc(100% - 3px));
    mask: radial-gradient(farthest-side, transparent calc(100% - 3px), #000 calc(100% - 3px));
}

:root .puzzle-page .ladder-node-label {
    color: var(--ch-muted);
    font-size: 0.64rem;
    font-weight: 800;
    letter-spacing: 0.04em;
}

:root .puzzle-page .ladder-node.is-current .ladder-node-label {
    color: var(--ch-text);
}

:root .puzzle-page .ladder-node-rail {
    flex: 1 1 auto;
    min-width: 14px;
    height: 4px;
    margin: 0 4px 18px;
    border-radius: 2px;
    background: var(--ch-surface-3);
}

:root .puzzle-page .ladder-node-rail.is-done {
    background: var(--tier-color);
}

:root .puzzle-page .ladder-sheet-foot {
    padding: 12px 18px 16px;
    border-top: 1px solid var(--ch-line);
    background: var(--ch-surface);
    color: var(--ch-muted);
    font-size: 0.78rem;
    line-height: 1.5;
}

:root .puzzle-page .ladder-sheet-foot p {
    margin: 0;
}

:root .puzzle-page .ladder-sheet-foot strong {
    color: var(--ch-text);
}

:root .puzzle-page .ladder-signin {
    display: inline-block;
    margin-top: 8px;
    color: var(--ch-orange);
    font-weight: 800;
    text-decoration: none;
}

/* ---------- Level up ---------- */

:root .puzzle-page .ladder-levelup {
    --tier-color: #9a6a3f;
    position: relative;
    width: min(360px, 100%);
    padding: 28px 24px 22px;
    border-radius: 14px;
    background:
        radial-gradient(120% 90% at 50% 0%, color-mix(in srgb, var(--tier-color) 34%, transparent), transparent 70%),
        var(--ch-surface);
    color: var(--ch-text);
    text-align: center;
    overflow: hidden;
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.55);
    animation: ladderPop 0.42s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes ladderPop {
    from { transform: scale(0.82); opacity: 0; }
}

:root .puzzle-page .ladder-levelup-rays {
    position: absolute;
    top: -90px;
    left: 50%;
    width: 360px;
    height: 360px;
    margin-left: -180px;
    background: repeating-conic-gradient(color-mix(in srgb, var(--tier-color) 22%, transparent) 0 10deg, transparent 10deg 20deg);
    -webkit-mask: radial-gradient(circle, #000 20%, transparent 62%);
    mask: radial-gradient(circle, #000 20%, transparent 62%);
    animation: ladderSpin 14s linear infinite;
    pointer-events: none;
}

@keyframes ladderSpin {
    to { transform: rotate(360deg); }
}

:root .puzzle-page .ladder-levelup-crest {
    position: relative;
    width: 112px;
    height: 124px;
    margin: 0 auto 12px;
    filter: drop-shadow(0 10px 18px rgba(0, 0, 0, 0.45));
    animation: ladderCrest 0.7s cubic-bezier(0.34, 1.56, 0.64, 1) 0.1s both;
}

:root .puzzle-page .ladder-levelup-crest .ladder-crest {
    width: 100%;
    height: 100%;
}

@keyframes ladderCrest {
    from { transform: scale(0.4) rotate(-12deg); opacity: 0; }
}

:root .puzzle-page .ladder-levelup-kicker {
    position: relative;
    margin: 0;
    color: var(--tier-color);
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

:root .puzzle-page .ladder-levelup-title {
    position: relative;
    margin: 4px 0 6px;
    font-size: 1.7rem;
    font-weight: 900;
}

:root .puzzle-page .ladder-levelup-copy {
    position: relative;
    margin: 0 0 18px;
    color: var(--ch-muted);
    font-size: 0.9rem;
}

:root .puzzle-page .ladder-levelup .puzzle-btn {
    position: relative;
    width: 100%;
}

/* ---------- Result card (title card after a solve) ---------- */

:root .puzzle-page .puzzle-panel.is-solved .puzzle-action-slot,
:root .puzzle-page .puzzle-panel.is-solved #puzzleStatus {
    display: none;
}

:root .puzzle-page .puzzle-card-meta.is-result .puzzle-card-meta-copy {
    display: none;
}

:root .puzzle-page .puzzle-result[hidden] {
    display: none;
}

:root .puzzle-page .puzzle-panel .puzzle-card-meta.is-result {
    --pr-accent: #6fbf55;
    position: relative;
    overflow: hidden;
    border: 1px solid color-mix(in srgb, var(--pr-accent) 45%, var(--ch-line));
    background:
        radial-gradient(120% 120% at 0% 0%, color-mix(in srgb, var(--pr-accent) 22%, transparent), transparent 60%),
        var(--ch-surface);
}

:root .puzzle-page .puzzle-panel .puzzle-card-meta.is-result.tone-gold {
    --pr-accent: #e2b43c;
}

:root .puzzle-page .puzzle-card-meta.is-result::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(105deg, transparent 35%, rgba(255, 255, 255, 0.14) 50%, transparent 65%);
    transform: translateX(-100%);
    animation: prShine 1.1s ease 0.25s 1 forwards;
    pointer-events: none;
}

@keyframes prShine {
    to { transform: translateX(100%); }
}

:root .puzzle-page .puzzle-result {
    position: relative;
    z-index: 1;
    display: grid;
    gap: 12px;
}

:root .puzzle-page .pr-head {
    display: flex;
    align-items: center;
    gap: 14px;
}

:root .puzzle-page .pr-badge {
    position: relative;
    flex: none;
    width: 56px;
    height: 56px;
}

:root .puzzle-page .pr-badge > svg {
    position: relative;
    z-index: 1;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: var(--pr-accent);
    box-shadow: 0 6px 18px color-mix(in srgb, var(--pr-accent) 45%, transparent);
    animation: prPop 0.55s cubic-bezier(0.34, 1.56, 0.64, 1);
}

:root .puzzle-page .pr-ring {
    fill: none;
    stroke: rgba(255, 255, 255, 0.35);
    stroke-width: 2;
}

:root .puzzle-page .pr-check {
    fill: none;
    stroke: #fff;
    stroke-width: 4.5;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-dasharray: 40;
    stroke-dashoffset: 40;
    animation: prDraw 0.4s ease 0.3s forwards;
}

@keyframes prPop {
    0% { transform: scale(0.2) rotate(-25deg); }
    100% { transform: scale(1) rotate(0); }
}

@keyframes prDraw {
    to { stroke-dashoffset: 0; }
}

:root .puzzle-page .pr-sparks {
    position: absolute;
    inset: 0;
}

:root .puzzle-page .pr-sparks span {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 6px;
    height: 6px;
    margin: -3px 0 0 -3px;
    border-radius: 2px;
    background: var(--pr-accent);
    opacity: 0;
    animation: prSpark 0.8s cubic-bezier(0.2, 0.8, 0.3, 1) calc(0.15s + var(--t)) forwards;
}

:root .puzzle-page .pr-sparks span:nth-child(3n) { background: var(--ch-orange); }
:root .puzzle-page .pr-sparks span:nth-child(4n) { background: #fff; width: 4px; height: 4px; }

@keyframes prSpark {
    0% { opacity: 1; transform: rotate(var(--a)) translateY(0) scale(1); }
    100% { opacity: 0; transform: rotate(var(--a)) translateY(calc(var(--d) * -1)) scale(0.4); }
}

:root .puzzle-page .pr-copy {
    min-width: 0;
}

:root .puzzle-page .pr-kicker {
    margin: 0;
    overflow: hidden;
    color: var(--ch-muted);
    font-size: 0.7rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    white-space: nowrap;
    text-overflow: ellipsis;
}

:root .puzzle-page .pr-title {
    margin: 1px 0 2px;
    color: var(--pr-accent);
    font-size: 1.55rem;
    font-weight: 900;
    line-height: 1.1;
    animation: prRise 0.45s ease 0.15s both;
}

:root .puzzle-page .pr-line {
    margin: 0;
    color: var(--ch-text);
    font-size: 0.86rem;
    line-height: 1.35;
    animation: prRise 0.45s ease 0.25s both;
}

:root:not([data-theme="dark"]) .puzzle-page .pr-title {
    color: color-mix(in srgb, var(--pr-accent) 68%, #000);
}

@keyframes prRise {
    from { opacity: 0; transform: translateY(6px); }
}

:root .puzzle-page .pr-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

:root .puzzle-page .pr-chip {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 4px 9px 4px 7px;
    border-radius: 999px;
    background: var(--ch-surface-2);
    color: var(--ch-text);
    font-size: 0.78rem;
    font-weight: 700;
    animation: prRise 0.35s ease both;
}

:root .puzzle-page .pr-chip:nth-child(2) { animation-delay: 0.32s; }
:root .puzzle-page .pr-chip:nth-child(3) { animation-delay: 0.39s; }
:root .puzzle-page .pr-chip:nth-child(4) { animation-delay: 0.46s; }
:root .puzzle-page .pr-chip:nth-child(5) { animation-delay: 0.53s; }

:root .puzzle-page .pr-chip svg {
    width: 14px;
    height: 14px;
    color: var(--ch-muted);
}

:root .puzzle-page .pr-chip.is-good svg { color: #6fbf55; }
:root .puzzle-page .pr-chip.is-down svg,
:root .puzzle-page .pr-chip.is-down { color: #e26a5d; }
:root .puzzle-page .pr-chip.is-up { color: #6fbf55; }
:root .puzzle-page .pr-chip.is-up svg { color: #6fbf55; }
:root .puzzle-page .pr-chip.is-streak svg { color: var(--ch-orange); }

:root .puzzle-page .pr-actions {
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: 6px;
}

:root .puzzle-page .pr-next {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 46px;
    padding: 0 14px;
    border: 0;
    border-radius: 8px;
    background: var(--ch-orange);
    color: #fff;
    font-size: 0.98rem;
    font-weight: 800;
    cursor: pointer;
    box-shadow: inset 0 -3px 0 var(--ch-orange-lo), 0 6px 16px rgba(236, 106, 53, 0.3);
    animation: prRise 0.4s ease 0.35s both, prNudge 2.4s ease-in-out 1.6s infinite;
    transition: background 0.15s ease, transform 0.12s ease;
}

:root .puzzle-page .pr-next:hover {
    background: var(--ch-orange-hi);
}

:root .puzzle-page .pr-next:active {
    transform: translateY(1px);
}

:root .puzzle-page .pr-next svg {
    width: 18px;
    height: 18px;
    transition: transform 0.15s ease;
}

:root .puzzle-page .pr-next:hover svg {
    transform: translateX(3px);
}

:root .puzzle-page .pr-next kbd {
    padding: 1px 6px;
    border-radius: 4px;
    background: rgba(0, 0, 0, 0.18);
    color: rgba(255, 255, 255, 0.85);
    font-family: inherit;
    font-size: 0.66rem;
    font-weight: 700;
}

@keyframes prNudge {
    0%, 100% { box-shadow: inset 0 -3px 0 var(--ch-orange-lo), 0 6px 16px rgba(236, 106, 53, 0.3); }
    50% { box-shadow: inset 0 -3px 0 var(--ch-orange-lo), 0 6px 24px rgba(236, 106, 53, 0.55); }
}

:root .puzzle-page .pr-ghost {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    min-width: 58px;
    min-height: 46px;
    padding: 0 8px;
    border: 1px solid var(--ch-line);
    border-radius: 8px;
    background: var(--ch-surface-2);
    color: var(--ch-text);
    font-size: 0.7rem;
    font-weight: 700;
    text-decoration: none;
    cursor: pointer;
    animation: prRise 0.4s ease 0.42s both;
}

:root .puzzle-page .pr-ghost:hover {
    background: var(--ch-surface-3);
}

:root .puzzle-page .pr-ghost svg {
    width: 17px;
    height: 17px;
}

:root .puzzle-page .puzzle-result {
    container-type: inline-size;
}

@container (max-width: 380px) {
    :root .puzzle-page .pr-actions {
        grid-template-columns: 1fr 1fr;
    }
    :root .puzzle-page .pr-next {
        grid-column: 1 / -1;
    }
    :root .puzzle-page .pr-ghost {
        flex-direction: row;
        gap: 6px;
        min-height: 38px;
        font-size: 0.8rem;
    }
    :root .puzzle-page .pr-ghost svg {
        width: 15px;
        height: 15px;
    }
    :root .puzzle-page .pr-title {
        font-size: 1.35rem;
    }
}

@media (hover: none) {
    :root .puzzle-page .pr-next kbd {
        display: none;
    }
}

@media (max-width: 640px) {
    :root .puzzle-page .puzzle-result {
        gap: 8px;
    }

    :root .puzzle-page .pr-head {
        gap: 10px;
    }

    :root .puzzle-page .pr-badge {
        width: 36px;
        height: 36px;
    }

    :root .puzzle-page .pr-title {
        margin: 0;
        font-size: 1.15rem;
    }

    :root .puzzle-page .pr-line {
        display: none;
    }

    :root .puzzle-page .pr-chips {
        gap: 4px;
    }

    :root .puzzle-page .pr-chip {
        padding: 2px 7px 2px 6px;
        font-size: 0.72rem;
    }

    :root .puzzle-page .pr-actions {
        grid-template-columns: minmax(0, 1fr) auto auto;
        gap: 4px;
    }

    :root .puzzle-page .pr-next {
        grid-column: auto;
        min-height: 36px;
        padding: 0 10px;
        font-size: 0.84rem;
    }

    :root .puzzle-page .pr-ghost {
        min-width: 0;
        min-height: 36px;
        padding: 0 8px;
    }

    :root .puzzle-page .ladder-delta {
        top: 8px;
        right: 8px;
        padding: 1px 7px;
        font-size: 0.72rem;
        line-height: 1.3;
    }
}

@media (prefers-reduced-motion: reduce) {
    :root .puzzle-page .puzzle-card-meta.is-result,
    :root .puzzle-page .puzzle-card-meta.is-result::after,
    :root .puzzle-page .pr-badge > svg,
    :root .puzzle-page .pr-title,
    :root .puzzle-page .pr-line,
    :root .puzzle-page .pr-chip,
    :root .puzzle-page .pr-next,
    :root .puzzle-page .pr-ghost,
    :root .puzzle-page .pr-sparks span {
        animation: none;
    }
    :root .puzzle-page .pr-check {
        animation: none;
        stroke-dashoffset: 0;
    }
}

/* ---------- Practice: theme picker + difficulty ---------- */

:root .puzzle-page .puzzle-panel .puzzle-card-filters {
    order: 2;
    display: grid;
    gap: 10px;
    padding: 10px;
}

:root .puzzle-page .puzzle-panel .puzzle-card-play {
    order: 3;
}

:root .puzzle-page .puzzle-panel .puzzle-card-filters[hidden] {
    display: none;
}

:root .puzzle-page .theme-ico {
    display: grid;
    place-items: center;
    flex: none;
    width: 40px;
    height: 40px;
    border-radius: 9px;
    background: var(--ch-orange-soft);
    color: var(--ch-orange-hi);
    font-family: "Segoe UI Symbol", "DejaVu Sans", system-ui, sans-serif;
    font-size: 1.25rem;
    font-weight: 800;
    line-height: 1;
    letter-spacing: -0.04em;
}

:root .puzzle-page .theme-pick {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 8px 10px 8px 8px;
    border: 1px solid var(--ch-line);
    border-radius: 8px;
    background: var(--ch-surface-2);
    color: var(--ch-text);
    text-align: left;
    cursor: pointer;
    transition: border-color 0.15s ease, background 0.15s ease;
}

:root .puzzle-page .theme-pick:hover {
    border-color: var(--ch-orange);
    background: var(--ch-surface-3);
}

:root .puzzle-page .theme-pick-text {
    display: flex;
    flex: 1 1 auto;
    flex-direction: column;
    min-width: 0;
}

:root .puzzle-page .theme-pick-text small {
    color: var(--ch-muted);
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

:root .puzzle-page .theme-pick-text strong {
    overflow: hidden;
    font-size: 1rem;
    font-weight: 800;
    white-space: nowrap;
    text-overflow: ellipsis;
}

:root .puzzle-page .theme-pick-change {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    color: var(--ch-orange-hi);
    font-size: 0.8rem;
    font-weight: 800;
}

:root .puzzle-page .theme-pick-change svg {
    width: 16px;
    height: 16px;
}

:root .puzzle-page .diff-seg {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 4px;
    padding: 4px;
    border-radius: 8px;
    background: var(--ch-surface-2);
}

:root .puzzle-page .diff-seg-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1px;
    min-height: 44px;
    padding: 6px 2px;
    border: 0;
    border-radius: 6px;
    background: transparent;
    color: var(--ch-muted);
    cursor: pointer;
    transition: background 0.15s ease, color 0.15s ease;
}

:root .puzzle-page .diff-seg-btn strong {
    font-size: 0.85rem;
    font-weight: 800;
}

:root .puzzle-page .diff-seg-btn small {
    font-size: 0.64rem;
    font-weight: 600;
    opacity: 0.85;
    white-space: nowrap;
}

:root .puzzle-page .diff-seg-btn:hover {
    color: var(--ch-text);
    background: var(--ch-surface-3);
}

:root .puzzle-page .diff-seg-btn.is-active {
    background: var(--ch-surface);
    color: var(--ch-text);
    box-shadow: inset 0 0 0 1px var(--ch-orange), 0 1px 2px rgba(0, 0, 0, 0.25);
}

:root .puzzle-page .diff-seg-btn.is-active small {
    color: var(--ch-orange-hi);
}

/* Theme sheet */
:root .puzzle-page .theme-sheet {
    width: min(720px, 100%);
}

:root .puzzle-page .theme-search {
    position: relative;
    padding: 12px 18px;
    background: var(--ch-surface);
    border-bottom: 1px solid var(--ch-line);
}

:root .puzzle-page .theme-search svg {
    position: absolute;
    top: 50%;
    left: 30px;
    width: 16px;
    height: 16px;
    color: var(--ch-muted);
    transform: translateY(-50%);
    pointer-events: none;
}

:root .puzzle-page .theme-search input {
    width: 100%;
    height: 42px;
    padding: 0 12px 0 38px;
    border: 1px solid var(--ch-line);
    border-radius: 8px;
    background: var(--ch-surface-2);
    color: var(--ch-text);
    font-size: 0.95rem;
    outline: none;
}

:root .puzzle-page .theme-search input:focus {
    border-color: var(--ch-orange);
    box-shadow: 0 0 0 3px var(--ch-orange-soft);
}

:root .puzzle-page .theme-sheet-body {
    flex: 1 1 auto;
    padding: 14px 18px 18px;
    overflow-y: auto;
    overscroll-behavior: contain;
}

:root .puzzle-page .theme-group[hidden],
:root .puzzle-page .theme-tile[hidden] {
    display: none;
}

:root .puzzle-page .theme-group-title {
    margin: 16px 0 8px;
    color: var(--ch-muted);
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

:root .puzzle-page .theme-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 8px;
}

:root .puzzle-page .theme-tile {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    min-height: 60px;
    padding: 9px 10px;
    border: 1px solid var(--ch-line);
    border-radius: 8px;
    background: var(--ch-surface);
    color: var(--ch-text);
    text-align: left;
    cursor: pointer;
    transition: border-color 0.15s ease, transform 0.15s ease, background 0.15s ease;
}

:root .puzzle-page .theme-tile:hover {
    border-color: color-mix(in srgb, var(--ch-orange) 60%, var(--ch-line));
    transform: translateY(-1px);
}

:root .puzzle-page .theme-tile.is-active {
    border-color: var(--ch-orange);
    background: color-mix(in srgb, var(--ch-orange) 10%, var(--ch-surface));
    box-shadow: inset 0 0 0 1px var(--ch-orange);
}

:root .puzzle-page .theme-tile-all {
    width: 100%;
}

:root .puzzle-page .theme-tile-text {
    display: flex;
    flex-direction: column;
    gap: 1px;
    min-width: 0;
}

:root .puzzle-page .theme-tile-text strong {
    font-size: 0.92rem;
    font-weight: 800;
}

:root .puzzle-page .theme-tile-text small {
    color: var(--ch-muted);
    font-size: 0.76rem;
    line-height: 1.3;
}

:root .puzzle-page .theme-group[data-theme-group="checkmates"] .theme-ico {
    background: rgba(194, 74, 63, 0.16);
    color: #e26a5d;
}

:root .puzzle-page .theme-group[data-theme-group="game-phase"] .theme-ico {
    background: rgba(44, 124, 214, 0.16);
    color: #6aa8ff;
}

:root .puzzle-page .theme-empty {
    margin: 24px 0;
    color: var(--ch-muted);
    text-align: center;
}

@media (max-width: 640px) {
    :root .puzzle-page .theme-grid {
        grid-template-columns: 1fr 1fr;
    }

    :root .puzzle-page .theme-tile {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    :root .puzzle-page .theme-tile-all {
        flex-direction: row;
        align-items: center;
    }

    :root .puzzle-page .theme-ico {
        width: 34px;
        height: 34px;
        font-size: 1.05rem;
    }
}

/* ---------- How to (mobile only; desktop already shows the guide) ---------- */

:root .puzzle-page .ladder-howto {
    display: none;
}

@media (max-width: 1024px) {
    :root .puzzle-page .ladder-card .ladder-howto {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        flex: none;
        width: 38px;
        height: 38px;
        border: 1px solid var(--ch-line);
        border-radius: 8px;
        background: var(--ch-surface-2);
        color: var(--ch-text);
        font: inherit;
        font-size: 1.15rem;
        font-weight: 800;
        line-height: 1;
        cursor: pointer;
    }

    :root .puzzle-page .ladder-card .ladder-howto.is-open {
        border-color: var(--ch-orange);
        color: var(--ch-orange);
    }

    body.page-puzzles #puzzle-ladder.is-open {
        display: block !important;
        scroll-margin-top: 12px;
    }
}

/* ---------- Ladder explainer (below the board) ---------- */

:root .ladder-guide .ladder-guide-scores {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    margin: 12px 0 16px;
}

:root .ladder-guide .ladder-guide-score {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: 12px;
    border-radius: 8px;
    background: var(--ch-surface);
    box-shadow: var(--ch-tile-shadow, none);
}

:root .ladder-guide .ladder-guide-score strong {
    font-size: 1.5rem;
    font-weight: 900;
    line-height: 1.1;
}

:root .ladder-guide .ladder-guide-score.is-up strong { color: #7cc35f; }
:root .ladder-guide .ladder-guide-score.is-down strong { color: #e26a5d; }

:root .ladder-guide .ladder-guide-formula {
    margin: 0 0 8px;
    color: var(--ch-text);
    font-size: 1.05rem;
}

:root .ladder-guide .ladder-guide-code {
    margin: 0 0 12px;
    padding: 12px 14px;
    overflow-x: auto;
    border-radius: 8px;
    background: var(--ch-surface);
    color: var(--ch-text);
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 0.86rem;
    line-height: 1.55;
    white-space: pre;
}

:root .ladder-guide .ladder-guide-table-wrap {
    margin: 14px 0 18px;
    overflow-x: auto;
}

:root .ladder-guide .ladder-guide-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0 8px;
    font-size: 0.95rem;
}

:root .ladder-guide .ladder-guide-table caption {
    caption-side: bottom;
    padding-top: 2px;
    color: var(--ch-muted);
    font-size: 0.78rem;
    text-align: left;
}

:root .ladder-guide .ladder-guide-table thead th {
    padding: 0 12px 2px;
    border: 0;
    color: var(--ch-muted);
    font-size: 0.68rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    text-align: center;
}

:root .ladder-guide .ladder-guide-table thead th:first-child {
    text-align: left;
}

:root .ladder-guide .ladder-guide-table tbody th,
:root .ladder-guide .ladder-guide-table tbody td {
    padding: 14px 12px;
    border-top: 1px solid var(--ch-line);
    border-bottom: 1px solid var(--ch-line);
    border-left: 0;
    border-right: 0;
    background: var(--ch-surface);
    text-align: center;
    font-variant-numeric: tabular-nums;
    font-weight: 800;
    font-size: 1.15rem;
    line-height: 1.1;
}

:root .ladder-guide .ladder-guide-table tbody th {
    text-align: left;
    border-left: 1px solid var(--ch-line);
    border-radius: 12px 0 0 12px;
}

:root .ladder-guide .ladder-guide-table tbody td:last-child {
    border-right: 1px solid var(--ch-line);
    border-radius: 0 12px 12px 0;
}

:root .ladder-guide .ladder-score-range {
    display: block;
    color: var(--ch-text);
    font-size: 0.95rem;
    font-weight: 800;
}

:root .ladder-guide .ladder-score-name {
    display: block;
    margin-top: 3px;
    color: var(--ch-muted);
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0;
}

:root .ladder-guide .ladder-guide-table td.is-up { color: #3d8f45; }
:root .ladder-guide .ladder-guide-table td.is-down { color: #d15a4e; }
:root[data-theme="dark"] .ladder-guide .ladder-guide-table td.is-up { color: #8fd36a; }
:root[data-theme="dark"] .ladder-guide .ladder-guide-table td.is-down { color: #f08a7e; }

:root .ladder-guide .ladder-guide-score span {
    color: var(--ch-muted);
    font-size: 0.85rem;
}

:root .ladder-guide .ladder-guide-tiers {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 8px;
    margin: 12px 0 16px;
    padding: 0;
    list-style: none;
}

:root .ladder-guide .ladder-guide-tiers li {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 0;
    padding: 10px 12px;
    border-radius: 10px;
    border: 1px solid var(--ch-line);
    background: var(--ch-surface);
}

:root .ladder-guide .ladder-guide-badge {
    flex: none;
    width: 36px;
    height: 42px;
}

:root .ladder-guide .ladder-guide-badge .ladder-crest {
    display: block;
    width: 100%;
    height: 100%;
}

:root .ladder-guide .ladder-guide-tier-copy {
    display: flex;
    flex-direction: column;
    gap: 1px;
    min-width: 0;
}

:root .ladder-guide .ladder-guide-tier-copy span {
    color: var(--ch-muted);
    font-size: 0.8rem;
}

:root .ladder-guide .ladder-guide-cta {
    display: inline-flex;
    width: auto;
    padding: 0 22px;
    text-decoration: none;
}

@media (max-width: 640px) {
    :root .ladder-guide .ladder-guide-scores {
        grid-template-columns: 1fr 1fr;
    }

    :root .ladder-guide .ladder-guide-table,
    :root .ladder-guide .ladder-guide-table tbody,
    :root .ladder-guide .ladder-guide-table tr,
    :root .ladder-guide .ladder-guide-table th,
    :root .ladder-guide .ladder-guide-table td {
        display: block;
    }

    :root .ladder-guide .ladder-guide-table thead {
        display: none;
    }

    :root .ladder-guide .ladder-guide-table {
        border-spacing: 0;
    }

    :root .ladder-guide .ladder-guide-table caption {
        display: block;
        width: 100%;
        margin-bottom: 8px;
        white-space: normal;
    }

    :root .ladder-guide .ladder-guide-table tbody tr {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 8px 10px;
        margin-bottom: 10px;
        padding: 12px;
        border: 1px solid var(--ch-line);
        border-radius: 12px;
        background: var(--ch-surface);
        box-shadow: var(--ch-tile-shadow, none);
    }

    :root .ladder-guide .ladder-guide-table tbody th,
    :root .ladder-guide .ladder-guide-table tbody td {
        padding: 0;
        border: 0;
        border-radius: 0;
        background: transparent;
    }

    :root .ladder-guide .ladder-guide-table tbody th {
        grid-column: 1 / -1;
        padding-bottom: 4px;
    }

    :root .ladder-guide .ladder-guide-table tbody td::before {
        content: attr(data-label);
        display: block;
        margin-bottom: 2px;
        color: var(--ch-muted);
        font-size: 0.68rem;
        font-weight: 700;
        letter-spacing: 0.04em;
        text-transform: uppercase;
    }
}

@media (max-width: 640px) {
    :root .puzzle-page .ladder-overlay:not(.ladder-levelup-overlay) {
        align-items: flex-end;
        padding: 0;
    }

    :root .puzzle-page .ladder-sheet {
        width: 100%;
        max-height: 90dvh;
        border-radius: 16px 16px 0 0;
    }

    :root .puzzle-page .ladder-sheet-stats {
        grid-template-columns: repeat(2, 1fr);
    }

    :root .puzzle-page .ladder-place-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (prefers-reduced-motion: reduce) {
    :root .puzzle-page .ladder-overlay,
    :root .puzzle-page .ladder-sheet,
    :root .puzzle-page .ladder-levelup,
    :root .puzzle-page .ladder-levelup-crest,
    :root .puzzle-page .ladder-levelup-rays,
    :root .puzzle-page .ladder-delta.is-show {
        animation: none;
    }
    :root .puzzle-page .ladder-delta.is-show {
        opacity: 1;
    }
}