/* Riddle Up — Number Sequence Challenge (public/assets/css/pages/number-sequence.css)
   Single-page start/active/results flow (see NumberSequenceController,
   number-sequence.js) - the numbers themselves are the visual hero.
   Uses the `--surface-*` dark-theme-safe tokens defined in ../site.css
   (loaded sitewide). Loaded via NumberSequenceController (see \Assets::add). */

.nsq-app { max-width: 32rem; margin: 0 auto; padding: 1rem 0 3rem; position: relative; }
.nsq-screen { width: 100%; }

/* ---- Start screen ---- */
.nsq-start-card {
    max-width: 27rem; margin: .5rem auto 0; padding: 2.25rem 1.75rem; border-radius: 1.25rem;
    border: 1px solid var(--border-color); background: var(--surface-bg); box-shadow: var(--surface-hover-shadow); text-align: center;
}
.nsq-start-icon { display: block; font-size: 3rem; margin-bottom: .5rem; }
.nsq-start-title { font-size: 1.3rem; font-weight: 800; letter-spacing: .03em; margin-bottom: .35rem; }
.nsq-start-tagline { font-weight: 700; opacity: .85; margin-bottom: .2rem; }
.nsq-start-sub { opacity: .65; font-size: .875rem; margin-bottom: .75rem; }

.nsq-pattern-icons { font-size: 1.35rem; letter-spacing: .5rem; margin-bottom: 1rem; opacity: .85; }

.nsq-best-row {
    display: flex; flex-wrap: wrap; justify-content: center; gap: .35rem 1rem;
    font-size: .8125rem; opacity: .85; margin-bottom: 1.1rem;
}
.nsq-best-row strong { color: rgb(var(--warning-rgb)); }

.nsq-pattern-picker { display: flex; flex-wrap: wrap; justify-content: center; gap: .4rem; margin-bottom: 1.1rem; }

.nsq-pattern-chip {
    background: var(--surface-muted-bg); border: 1px solid transparent; border-radius: 50rem;
    padding: .35rem .8rem; min-height: 2.2rem; font-size: .8125rem; font-weight: 600; color: var(--body-color); opacity: .75;
}
.nsq-pattern-chip--active { background: rgba(var(--indigo-rgb), .14); border-color: var(--indigo); color: var(--indigo); opacity: 1; }

.nsq-start-btn { width: 100%; font-weight: 800; min-height: 2.9rem; letter-spacing: .02em; }

.nsq-leaderboard-link {
    display: inline-flex; align-items: center; gap: .35rem; background: none; border: none;
    margin-top: 1rem; padding: .3rem .5rem; min-height: 2.5rem; font-weight: 600; font-size: .8125rem; color: var(--indigo);
}

.nsq-howto { margin-top: 1rem; text-align: left; font-size: .8125rem; }
.nsq-howto summary { cursor: pointer; font-weight: 600; opacity: .75; text-align: center; }
.nsq-howto ul { margin: .6rem 0 0; padding-left: 1.1rem; opacity: .8; }
.nsq-howto li { margin-bottom: .3rem; }

/* ---- Header ---- */
.nsq-header { margin-bottom: .5rem; }

.nsq-exit-btn {
    display: inline-flex; align-items: center; gap: .3rem; background: none; border: none;
    padding: .3rem .25rem; min-height: 2.5rem; font-weight: 600; font-size: .8125rem; color: var(--body-color); opacity: .75;
}

.nsq-header-title { font-weight: 800; font-size: .875rem; letter-spacing: .02em; opacity: .8; }
.nsq-header-trophy { background: none; border: none; min-height: 2.5rem; min-width: 2.5rem; color: rgb(var(--warning-rgb)); font-size: 1.1rem; }

.nsq-badge {
    display: inline-block; padding: .25rem .8rem; border-radius: 50rem;
    font-weight: 700; font-size: .7rem; letter-spacing: .05em;
}
.nsq-badge--easy { background: rgba(var(--success-rgb), .14); color: rgb(var(--success-rgb)); }
.nsq-badge--medium { background: rgba(var(--warning-rgb), .16); color: rgb(var(--warning-rgb)); }
.nsq-badge--hard { background: rgb(var(--danger-rgb)); color: var(--white); }
.nsq-badge--extreme { background: linear-gradient(135deg, rgb(var(--danger-rgb)), var(--indigo)); color: var(--white); }

.nsq-puzzle-number { font-size: .8125rem; font-weight: 700; letter-spacing: .06em; opacity: .55; }

.nsq-stats-row { gap: .5rem; margin: .35rem 0 .75rem; }
.nsq-stat-pill {
    display: inline-flex; align-items: center; gap: .3rem; font-size: .8125rem; font-weight: 600;
    padding: .25rem .7rem; border-radius: 50rem; background: var(--surface-muted-bg);
}

.nsq-error {
    text-align: center; padding: .75rem 1rem; border-radius: .8rem;
    background: rgba(var(--danger-rgb), .1); border: 1px solid rgba(var(--danger-rgb), .3); margin-bottom: .75rem;
}
.nsq-error p { margin-bottom: .5rem; font-size: .875rem; }

/* ---- Puzzle card (the hero) ---- */
.nsq-puzzle-card {
    background: var(--surface-bg); border: 1px solid var(--border-color); border-radius: 1.25rem;
    box-shadow: var(--surface-hover-shadow); padding: 1.75rem 1.25rem; margin-bottom: 1rem; text-align: center;
}

.nsq-prompt {
    margin: 0 0 1.1rem; font-size: .8125rem; font-weight: 700; letter-spacing: .06em;
    text-transform: uppercase; color: var(--indigo);
}

.nsq-sequence {
    display: flex; flex-wrap: wrap; align-items: center; justify-content: center;
    gap: .25rem .4rem; row-gap: .6rem;
}

@media (prefers-reduced-motion: no-preference) {
    .nsq-sequence { animation: nsq-fade-in .25s ease both; }
}
@keyframes nsq-fade-in {
    from { opacity: 0; transform: translateY(.4rem); }
    to { opacity: 1; transform: translateY(0); }
}

.nsq-term {
    font-size: clamp(1.5rem, 7vw, 2.15rem); font-weight: 800; line-height: 1;
    padding: .15rem .35rem;
}
.nsq-term--placeholder {
    color: var(--indigo); border: 2px dashed var(--indigo); border-radius: .6rem;
    padding: .1rem .55rem; background: rgba(var(--indigo-rgb), .08);
}
.nsq-arrow { font-size: 1.25rem; opacity: .4; }

/* ---- Answer form ---- */
.nsq-answer-form { display: flex; gap: .5rem; margin-bottom: .35rem; }

.nsq-answer-input {
    flex: 1; min-width: 0; padding: .8rem 1rem; font-size: 1.15rem; font-weight: 700; text-align: center;
    border-radius: .9rem; border: 1px solid var(--border-color); background: var(--surface-bg); color: var(--body-color);
}
.nsq-answer-input:focus {
    outline: none; border-color: var(--indigo); box-shadow: 0 0 0 .2rem rgba(var(--indigo-rgb), .2);
}
.nsq-answer-input:disabled { opacity: .6; }

.nsq-submit-btn { flex-shrink: 0; font-weight: 700; padding: 0 1.4rem; min-height: 2.9rem; }

.nsq-inline-error {
    color: rgb(var(--danger-rgb)); font-size: .8125rem; font-weight: 600; text-align: center; margin: .35rem 0 0;
}

.nsq-secondary-actions { gap: 1.5rem; margin-top: .9rem; }
.nsq-text-btn {
    background: none; border: none; padding: .4rem .25rem; min-height: 2.75rem;
    font-weight: 600; font-size: .875rem; color: var(--indigo);
    display: inline-flex; align-items: center; gap: .35rem;
}
.nsq-text-btn:disabled { opacity: .5; }
.nsq-text-btn--muted { color: var(--body-color); opacity: .6; }

.nsq-hint-panel {
    background: rgba(var(--warning-rgb), .1); border: 1px dashed rgba(var(--warning-rgb), .4);
    border-radius: .9rem; padding: .9rem 1.1rem; margin-top: .75rem; font-size: .9rem; text-align: center;
}

.nsq-reveal-confirm {
    background: var(--surface-muted-bg); border: 1px solid var(--border-color); border-radius: .9rem;
    padding: .9rem 1.1rem; margin-top: .75rem; text-align: center;
}
.nsq-reveal-confirm p { margin-bottom: .6rem; font-size: .8125rem; }

/* ---- Result overlay ---- */
.nsq-result {
    position: fixed; inset: 0; z-index: 1050; display: flex; align-items: center; justify-content: center;
    padding: 1.25rem; background: rgba(0, 0, 0, .45); cursor: pointer;
}

.nsq-result-inner {
    width: 100%; max-width: 23rem; max-height: 88vh; overflow-y: auto;
    background: var(--surface-bg); border-radius: 1.25rem; padding: 1.75rem 1.5rem;
    text-align: center; box-shadow: 0 1rem 3rem rgba(0, 0, 0, .25);
}

@media (prefers-reduced-motion: no-preference) {
    .nsq-result-inner { animation: nsq-result-in .2s ease both; }
}
@keyframes nsq-result-in {
    from { opacity: 0; transform: scale(.92); }
    to { opacity: 1; transform: scale(1); }
}

.nsq-result-icon { font-size: 2.5rem; line-height: 1; margin-bottom: .35rem; }
.nsq-result-title { font-size: 1.3rem; font-weight: 800; letter-spacing: .02em; margin-bottom: .75rem; }
.nsq-result--correct .nsq-result-title { color: rgb(var(--success-rgb)); }
.nsq-result--wrong .nsq-result-title { color: rgb(var(--danger-rgb)); }

.nsq-result-sequence {
    display: flex; flex-wrap: wrap; align-items: center; justify-content: center;
    gap: .15rem .25rem; row-gap: .4rem; margin-bottom: .6rem;
}
.nsq-term--sm { font-size: 1.15rem; font-weight: 800; padding: .05rem .15rem; }
.nsq-arrow--sm { font-size: .9rem; opacity: .4; }
.nsq-term--answer { color: var(--indigo); }

.nsq-wrong-box { font-size: .8125rem; margin-bottom: .5rem; opacity: .85; }
.nsq-wrong-label { font-weight: 600; opacity: .7; }

.nsq-breakdown { margin-bottom: .5rem; }
.nsq-breakdown span[data-el="bd-total"] { display: block; font-weight: 800; font-size: 1.15rem; color: var(--indigo); }
.nsq-breakdown-detail { display: block; font-size: .75rem; opacity: .65; margin-top: .1rem; }

.nsq-result-streak,
.nsq-result-milestone,
.nsq-result-level {
    display: inline-block; font-weight: 700; font-size: .8125rem; padding: .25rem .75rem;
    border-radius: 50rem; background: var(--surface-muted-bg); margin: .2rem .15rem 0;
}
.nsq-result-milestone { color: rgb(var(--warning-rgb)); background: rgba(var(--warning-rgb), .14); }

.nsq-pattern-panel {
    text-align: left; background: var(--surface-muted-bg); border-radius: .8rem;
    padding: .9rem 1.1rem; margin-top: .9rem;
}
.nsq-pattern-label { font-weight: 700; font-size: .8125rem; letter-spacing: .03em; margin-bottom: .3rem; color: var(--indigo); }
.nsq-pattern-summary { font-size: .875rem; margin-bottom: .5rem; opacity: .9; }
.nsq-pattern-steps { margin: 0; padding-left: 1.1rem; font-size: .8125rem; opacity: .85; font-variant-numeric: tabular-nums; }
.nsq-pattern-steps li { margin-bottom: .2rem; }

/* ---- Results screen ---- */
.nsq-score-card {
    max-width: 28rem; margin: 1rem auto 0; padding: 2.25rem 1.75rem; border-radius: 1.25rem;
    border: 1px solid var(--border-color); background: var(--surface-bg); box-shadow: var(--surface-hover-shadow); text-align: center;
}
.nsq-score-icon { font-size: 2.25rem; display: block; margin-bottom: .5rem; }
.nsq-score-title { font-size: 1.35rem; font-weight: 800; margin-bottom: .5rem; }
.nsq-best-banner { font-weight: 700; color: rgb(var(--warning-rgb)); margin-bottom: .5rem; }
.nsq-score-points { font-size: 2rem; font-weight: 800; color: var(--indigo); margin-bottom: .1rem; }
.nsq-score-sub { opacity: .75; margin-bottom: 1.25rem; }

.nsq-stats { margin-bottom: .5rem; }
.nsq-stat { display: flex; flex-direction: column; align-items: center; padding: .9rem .5rem; border-radius: .9rem; background: var(--surface-muted-bg); }
.nsq-stat-value { font-size: 1.15rem; font-weight: 700; }
.nsq-stat-label { font-size: .68rem; text-transform: uppercase; letter-spacing: .04em; opacity: .6; text-align: center; }

.nsq-all-games-link { display: inline-block; margin-top: 1rem; font-size: .8125rem; font-weight: 600; color: var(--body-color); opacity: .65; }

/* ---- Leaderboard panel ---- */
.nsq-leaderboard-overlay {
    position: fixed; inset: 0; z-index: 1060; display: flex; align-items: center; justify-content: center;
    padding: 1rem; background: rgba(0, 0, 0, .5);
}
.nsq-leaderboard-card {
    width: 100%; max-width: 27rem; max-height: 85vh; overflow-y: auto;
    background: var(--surface-bg); border-radius: 1.1rem; padding: 1.25rem; box-shadow: 0 1rem 3rem rgba(0, 0, 0, .3);
}
.nsq-leaderboard-title { display: flex; align-items: center; gap: .4rem; font-size: 1.05rem; font-weight: 800; color: rgb(var(--warning-rgb)); margin: 0; }
.nsq-close-btn { background: none; border: none; min-height: 2.5rem; min-width: 2.5rem; color: var(--body-color); opacity: .6; }

.nsq-lb-tabs { display: flex; gap: .35rem; overflow-x: auto; margin-bottom: .75rem; padding-bottom: .25rem; }
.nsq-lb-tab {
    flex-shrink: 0; background: var(--surface-muted-bg); border: none; border-radius: 50rem;
    padding: .4rem 1rem; font-size: .8125rem; font-weight: 600; color: var(--body-color); opacity: .7;
}
.nsq-lb-tab--active { background: var(--indigo); color: var(--white); opacity: 1; }

.nsq-lb-table { display: flex; flex-direction: column; }
.nsq-lb-row {
    display: grid; grid-template-columns: 2.5rem 1fr auto auto; align-items: center; gap: .5rem;
    padding: .55rem .25rem; border-bottom: 1px solid var(--surface-divider); font-size: .8125rem;
}
.nsq-lb-row:last-child { border-bottom: none; }
.nsq-lb-row--you { background: rgba(var(--indigo-rgb), .08); border-radius: .6rem; font-weight: 700; }

.nsq-lb-rank { opacity: .6; font-weight: 700; }
.nsq-lb-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.nsq-lb-score { font-weight: 700; color: var(--indigo); white-space: nowrap; }
.nsq-lb-solved { opacity: .6; font-size: .75rem; white-space: nowrap; }
.nsq-lb-sep { text-align: center; opacity: .4; padding: .25rem 0; }
.nsq-lb-empty,
.nsq-lb-loading { text-align: center; opacity: .65; font-size: .875rem; padding: 1.5rem 0; }

@media (min-width: 576px) {
    .nsq-app { padding-top: 1.5rem; }
    .nsq-puzzle-card { padding: 2.25rem 1.75rem; }
    .nsq-term { font-size: clamp(1.75rem, 4vw, 2.5rem); }
}