/* Chess Basics lesson shell: intentionally mirrors training.html components.
   --accent is training.html's own cyan, unchanged. --lesson-gold is kept as a
   name for the rules below that reference it, but now resolves to the same
   violet used across the rest of Chess Basics (courses.html's --fusion-purple
   value) instead of a standalone gold — a secondary accent, not a second
   brand. Success/complete states below were also moved off a bespoke teal
   onto the site's real --success token (styles.css, loaded before this file
   on chess-basics.html). */
.basics-course-page {
    --bg-dark: #070b10;
    --panel-bg: linear-gradient(180deg, #151d27 0%, #10161f 100%);
    --accent: #00c8ff;
    --text-white: #fff;
    --text-muted: #a7b3c4;
    --border-color: #344052;
    --hover-bg: #202a37;
    --board-theme-color: rgba(140, 162, 173, 0.6);
    --lesson-gold: #ad7dff;
    --training-board-size: clamp(560px, calc(100vw - 420px), 720px);
    --training-surface-border: 1px solid rgba(255, 255, 255, 0.07);
    --training-surface-shadow: 0 18px 46px rgba(0, 0, 0, 0.34);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    background: #000;
    color: var(--text-white);
    font-family: 'Cairo', sans-serif;
}

.basics-course-page *,
.basics-course-page *::before,
.basics-course-page *::after { box-sizing: border-box; }

.basics-course-page .cr-topbar {
    position: fixed;
    top: 0;
    z-index: 1000;
    width: 100%;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    background: rgba(7, 11, 16, 0.86) !important;
    backdrop-filter: blur(14px);
}

.basics-course-page .cr-topbar-logo img {
    width: 32px;
    height: 32px;
    border-radius: 50%;
}

.basics-back-to-courses { gap: 8px; text-decoration: none; }
[dir="ltr"] .basics-back-to-courses i { transform: rotate(180deg); }

.basics-training-main {
    flex: 1;
    display: flex;
    justify-content: center;
    padding: 20px 0 40px;
}

.basics-course-page .main-layout {
    display: flex;
    flex-direction: row-reverse;
    align-items: center;
    justify-content: center;
    gap: 24px;
    width: 100%;
    max-width: 1500px;
    margin: 77px auto 0;
    padding: 0 16px;
}

.basics-course-page .board-frame {
    width: var(--training-board-size);
    max-width: 100%;
    flex: 0 0 var(--training-board-size);
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 14px;
    border: var(--training-surface-border);
    border-radius: 16px;
    background: var(--panel-bg);
    box-shadow: var(--training-surface-shadow);
}

.basics-course-page .board-status-strip {
    min-height: 42px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 0 2px;
}

.basics-course-page .board-status-pill {
    min-height: 28px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 4px 10px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.045);
    color: #eaf2fb;
    font-size: 12px;
    font-weight: 700;
    line-height: 1.2;
    white-space: nowrap;
}

.basics-course-page .board-status-pill.primary {
    border-color: rgba(0, 200, 255, 0.85);
    background: linear-gradient(135deg, #33d7ff, #00a7dc);
    box-shadow: 0 0 22px rgba(0, 200, 255, 0.2);
    color: #03131a;
}

.basics-course-page .board-status-pill.muted { color: #cbd7e6; }

.basics-board-objective {
    display: none;
    align-items: flex-start;
    gap: 9px;
    padding: 10px 12px;
    border: 1px solid rgba(173, 125, 255, 0.18);
    border-radius: 10px;
    background: rgba(173, 125, 255, 0.07);
    color: #e3d9ff;
    font-size: 12px;
    font-weight: 700;
    line-height: 1.55;
}

.basics-board-objective i { margin-top: 4px; color: var(--lesson-gold); }

.basics-course-page .board-container {
    width: 100%;
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    border-radius: 8px;
    box-shadow: 0 12px 34px rgba(0, 0, 0, 0.42);
}

.basics-course-page .control-panel {
    position: relative;
    width: 100%;
    max-width: 340px;
    min-height: 0;
    flex: 0 0 340px;
    display: flex;
    flex-direction: column;
    padding: 20px;
    overflow: visible;
    border: var(--training-surface-border);
    border-radius: 16px;
    background: var(--panel-bg);
    box-shadow: var(--training-surface-shadow);
}

.basics-course-page .panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 16px;
}

.basics-course-page .header-title-group { min-width: 0; text-align: start; }
.basics-course-page .header-title { color: var(--text-white); font-size: 20px; font-weight: 700; line-height: 1.25; }
.basics-course-page .header-subtitle { color: #b9c4d2; font-size: 14px; }

.basics-course-page .badge-dropdown-container { position: relative; flex-shrink: 0; }
.basics-course-page .step-indicator {
    min-width: 48px;
    padding: 4px 12px;
    border: 1px solid rgba(0, 200, 255, 0.3);
    border-radius: 8px;
    background: rgba(0, 200, 255, 0.12);
    color: var(--accent);
    font-family: inherit;
    font-size: 18px;
    font-weight: 700;
    cursor: pointer;
}

.basics-course-page .step-indicator:hover,
.basics-course-page .step-indicator:focus-visible {
    outline: none;
    border-color: var(--accent);
    background: rgba(0, 200, 255, 0.2);
}

.basics-course-page .line-dropdown-menu {
    position: absolute;
    top: calc(100% + 10px);
    inset-inline-end: 0;
    z-index: 120;
    width: 270px;
    max-width: calc(100vw - 40px);
    display: none;
    padding: 7px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 12px;
    background: rgba(13, 17, 23, 0.98);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(25px);
    max-height: min(68vh, 620px);
    overflow-y: auto;
    scrollbar-width: thin;
}

.basics-course-page .line-dropdown-menu.show { display: grid; gap: 3px; }

.basics-menu-section {
    position: sticky;
    top: -7px;
    z-index: 2;
    margin: 3px 0 2px;
    padding: 9px 10px 6px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    background: rgba(13, 17, 23, 0.98);
    color: var(--lesson-gold);
    font-size: 10px;
    font-weight: 900;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.basics-lesson-option {
    width: 100%;
    min-height: 46px;
    display: grid;
    grid-template-columns: 28px 1fr auto;
    align-items: center;
    gap: 10px;
    padding: 5px 10px;
    border: 0;
    border-radius: 8px;
    background: transparent;
    color: #c9d3df;
    font-family: inherit;
    text-align: start;
    cursor: pointer;
}

.basics-lesson-option:hover { background: rgba(255, 255, 255, 0.06); color: #fff; }
.basics-lesson-option.is-active { background: rgba(0, 200, 255, 0.1); color: var(--accent); }
.basics-lesson-option i { color: rgba(255, 255, 255, 0.2); font-size: 11px; }
.basics-lesson-option.is-complete i { color: var(--success, #22c55e); }
/* The previous / next chevrons are drawn for Arabic (previous points right);
   mirror them wherever the page reads left-to-right. */
html:not([dir="rtl"]) #basicsPreviousButton i,
html:not([dir="rtl"]) #basicsNextButton i {
    transform: scaleX(-1);
}

/* Notation symbols ("e.p.", "O-O") stay an LTR island on the Arabic page. */
.basics-option-piece { font-size: 23px; line-height: 1; text-align: center; direction: ltr; unicode-bidi: isolate; }
.basics-option-piece.is-notation { font-size: 10px; font-weight: 900; letter-spacing: -0.06em; }

.basics-course-page .progress-container {
    height: 4px;
    display: flex;
    direction: ltr;
    margin-bottom: 8px;
    overflow: hidden;
    border-radius: 2px;
    background: #2a3240;
}

.basics-course-page #progressBar {
    width: 0;
    height: 100%;
    background: var(--accent);
    transition: width 0.3s ease;
}

.basics-exercise-strip {
    display: flex;
    align-items: center;
    gap: 7px;
    min-height: 38px;
    margin: 2px 0 10px;
    overflow-x: auto;
    scrollbar-width: none;
}

.basics-exercise-strip::-webkit-scrollbar { display: none; }

.basics-exercise-step {
    position: relative;
    width: 44px;
    height: 44px;
    flex: 0 0 44px;
    display: grid;
    place-items: center;
    border: 1px solid rgba(255, 255, 255, 0.13);
    border-radius: 9px;
    background: rgba(255, 255, 255, 0.035);
    color: #7f8a99;
    font: 800 11px/1 "SF Mono", "Consolas", monospace;
    cursor: pointer;
}

.basics-exercise-step:hover,
.basics-exercise-step:focus-visible {
    border-color: rgba(0, 200, 255, 0.55);
    color: #fff;
}

.basics-exercise-step:focus-visible {
    outline: 2px solid #fff;
    outline-offset: 2px;
}

.basics-exercise-step.is-active {
    border-color: var(--accent);
    background: rgba(0, 200, 255, 0.13);
    color: var(--accent);
    box-shadow: 0 0 14px rgba(0, 200, 255, 0.12);
}

.basics-exercise-step.is-complete {
    border-color: rgba(34, 197, 94, 0.42);
    background: var(--success-bg, rgba(34, 197, 94, 0.1));
    color: var(--success, #22c55e);
}

.basics-exercise-step.is-complete i {
    position: absolute;
    top: -4px;
    inset-inline-end: -4px;
    width: 14px;
    height: 14px;
    display: grid;
    place-items: center;
    border: 2px solid #111923;
    border-radius: 50%;
    background: var(--success, #22c55e);
    color: #062b20;
    font-size: 7px;
}

.basics-course-page .lesson-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 20px;
    color: #c3cedc;
    font-size: 12px;
    font-weight: 700;
}

/* This element holds a full localized sentence ("1 نقلات · أقصر مسار: 1 …"),
   not a bare counter. Forcing direction:ltr scrambled the Arabic word order
   around the digits, and monospace fonts have no Arabic shaping, so letters
   rendered disconnected. Inherit the page direction and UI font instead. */
.basics-course-page .lesson-progress-text {
    color: var(--accent);
    font-family: inherit;
}

.basics-course-page .coach-bubble {
    width: 100%;
    min-height: 80px;
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 16px;
    padding: 16px;
    border: 1px solid #2a3240;
    border-radius: 14px;
    background: #1e2632;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

.basics-course-page .coach-icon {
    width: 34px;
    height: 34px;
    flex: 0 0 34px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.07);
}

.basics-course-page .coach-icon img { width: 100%; height: 100%; object-fit: cover; }
.basics-course-page .coach-content { flex: 1; display: flex; flex-direction: column; gap: 4px; }
.basics-course-page .coach-title { color: var(--accent); font-size: 13px; font-weight: 700; letter-spacing: 0.5px; text-transform: uppercase; }
.basics-course-page .coach-text { color: #fff; font-size: 14px; font-weight: 500; line-height: 1.6; }
.basics-course-page .coach-subtext { min-height: 18px; margin-top: 3px; color: #8a95a6; font-size: 12px; }
.basics-course-page .coach-bubble.shake-error { animation: basics-training-shake 0.4s ease-in-out; }

.basics-training-rules {
    min-height: 0;
    margin-bottom: 16px;
    padding: 0;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.07);
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.025);
}

.basics-rules-heading {
    display: flex;
    align-items: center;
    gap: 8px;
    min-height: 44px;
    padding: 10px 13px;
    color: #fff;
    font-size: 13px;
    font-weight: 700;
    list-style: none;
    cursor: pointer;
}
.basics-rules-heading::-webkit-details-marker { display: none; }
.basics-rules-heading i { color: var(--accent); }
.basics-rules-chevron { margin-inline-start: auto; color: #758397 !important; transition: transform 0.2s ease; }
.basics-training-rules[open] .basics-rules-chevron { transform: rotate(180deg); }
.basics-rules-body { max-height: 235px; padding: 0 13px 13px; overflow-y: auto; scrollbar-width: thin; }
.basics-lesson-intro { margin: 0 0 10px; color: #aeb9c8; font-size: 12px; line-height: 1.65; }
.basics-course-page .basics-rule-list { display: grid; gap: 7px; margin: 0; padding: 0; list-style: none; }
.basics-course-page .basics-rule-list li { display: grid; grid-template-columns: 13px 1fr; gap: 7px; color: #cbd5e2; font-size: 12px; line-height: 1.55; }
.basics-course-page .basics-rule-list li i { margin-top: 6px; color: var(--lesson-gold); font-size: 6px; }

.basics-training-complete {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 14px;
    padding: 10px 12px;
    border: 1px solid rgba(34, 197, 94, 0.25);
    border-radius: 10px;
    background: var(--success-bg, rgba(34, 197, 94, 0.08));
}

.basics-training-complete[hidden] { display: none; }
.basics-training-complete > i { color: var(--success, #22c55e); font-size: 20px; }
.basics-training-complete strong { display: block; color: #4ade80; font-size: 12px; }
.basics-training-complete span { display: block; margin-top: 2px; color: var(--text-secondary, #94a3b8); font-size: 11px; }

.basics-training-complete > div { min-width: 0; flex: 1; }

.basics-continue-button {
    min-height: 34px;
    flex: 0 0 auto;
    padding: 5px 11px;
    border: 1px solid rgba(34, 197, 94, 0.35);
    border-radius: 8px;
    background: rgba(34, 197, 94, 0.12);
    color: #4ade80;
    font-family: inherit;
    font-size: 10px;
    font-weight: 800;
    cursor: pointer;
}

.basics-continue-button:hover,
.basics-continue-button:focus-visible {
    outline: none;
    border-color: var(--success, #22c55e);
    background: rgba(34, 197, 94, 0.2);
}

/* Wraps so the labelled hint button takes a full row of its own: the panel's
   300px content width cannot fit five 44px icon buttons AND a labelled button
   on one line (needs 309px+), which clipped the hint label at the panel edge. */
.basics-course-page .bottom-controls { display: flex; flex-wrap: wrap; gap: 9px; margin-top: auto; }
.basics-course-page .control-btn {
    height: 44px;
    min-width: 44px;
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: transparent;
    color: #aeb9c8;
    font-family: inherit;
    font-size: 15px;
    cursor: pointer;
    transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.basics-course-page .control-btn:hover,
.basics-course-page .control-btn:focus-visible {
    border-color: var(--board-theme-color);
    background: var(--hover-bg);
    color: #fff;
    box-shadow: 0 0 12px var(--board-theme-color);
}

.basics-course-page .control-btn:focus-visible {
    outline: 2px solid #fff;
    outline-offset: 2px;
}

.basics-course-page .control-btn:disabled { opacity: 0.35; cursor: default; box-shadow: none; }
.basics-course-page .basics-control-wide { flex: 1 1 100%; padding-inline: 12px; font-size: 12px; }
.basics-course-page #basicsResetButton i { transition: transform 0.45s ease; }
.basics-course-page #basicsResetButton:hover i { transform: rotate(360deg); }
.basics-course-page #basicsFlipButton i { transition: transform 0.45s ease; }
.basics-course-page #basicsFlipButton:hover i { transform: rotate(180deg); }

.cm-chessboard .markers .marker.basics-found-marker {
    fill: none;
    stroke: var(--success, #22c55e) !important;
    stroke-width: 3px;
    opacity: 0.9 !important;
}

.cm-chessboard .markers .marker.basics-hint-from {
    fill: none;
    stroke: #ad7dff !important;
    stroke-width: 4px;
    opacity: 0.95 !important;
}

.cm-chessboard .markers .marker.basics-hint-to {
    fill: rgba(0, 200, 255, 0.2) !important;
    stroke: #00c8ff !important;
    stroke-width: 3px;
    opacity: 0.95 !important;
}

.cm-chessboard .arrow.basics-path-arrow .arrow-head {
    fill: #00c8ff !important;
}

.cm-chessboard .arrow.basics-path-arrow .arrow-line {
    stroke: #00c8ff !important;
    stroke-width: 12px !important;
    stroke-linecap: round !important;
    opacity: 0.62 !important;
    filter: drop-shadow(0 0 4px rgba(0, 200, 255, 0.5));
}

.aura-exercise-overlay { pointer-events: none; }

.aura-target-star {
    fill: #ad7dff;
    stroke: #3d2166;
    stroke-width: 2px;
    paint-order: stroke;
    transform-box: fill-box;
    transform-origin: center;
    filter: drop-shadow(0 0 7px rgba(173, 125, 255, 0.9));
}

.aura-target-star.hit {
    fill: var(--success, #22c55e);
    stroke: #0f5132;
    animation: aura-target-hit 0.35s ease-out both;
}

@keyframes aura-target-hit {
    50% {
        filter: drop-shadow(0 0 18px rgba(34, 197, 94, 1));
        transform: scale(1.24);
    }
}

@keyframes basics-training-shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-6px); }
    50% { transform: translateX(6px); }
    75% { transform: translateX(-4px); }
}

@media (max-width: 1024px) {
    .basics-course-page .main-layout {
        flex-direction: column;
        align-items: center;
        gap: 24px;
        padding-top: 20px;
    }
    .basics-course-page .board-frame,
    .basics-course-page .control-panel {
        width: 100%;
        max-width: min(94vw, 720px);
        flex: none;
    }
    .basics-course-page .control-panel { min-height: 0; }
    .basics-board-objective { display: flex; }
}

@media (max-width: 768px) {
    .basics-course-page .main-layout { gap: 20px; padding-inline: 12px; }
    .basics-course-page .board-frame { padding: 10px; border-radius: 12px; }
    .basics-course-page .board-status-strip { align-items: stretch; flex-direction: column; }
    .basics-course-page .board-status-pill { width: 100%; }
    .basics-course-page .control-panel { padding: 16px; border-radius: 12px; }
    .basics-back-to-courses span { display: none; }
}

@media (max-width: 560px) {
    .basics-course-page .cr-topbar-logo span,
    .basics-course-page .cr-topbar-icons a { display: none; }
    .basics-course-page .bottom-controls { gap: 6px; }
    .basics-course-page .basics-control-wide .hint-text { display: none; }
    .basics-course-page .basics-control-wide { flex: 1; }
    .basics-training-complete { align-items: flex-start; flex-wrap: wrap; }
    .basics-continue-button { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
    .basics-course-page *,
    .basics-course-page *::before,
    .basics-course-page *::after { scroll-behavior: auto !important; animation: none !important; transition: none !important; }
}

/* Startup failure: the same shape as the completion panel, in a warning tone.
   Shown only when the page could not start, and always with a way out. */
.basics-training-error {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 14px 0 0;
    padding: 14px 16px;
    border: 1px solid rgba(245, 158, 11, 0.35);
    border-radius: 14px;
    background: rgba(245, 158, 11, 0.10);
    color: var(--text-primary, #f0f0f5);
}

.basics-training-error[hidden] { display: none; }

.basics-training-error > i {
    font-size: 1.2rem;
    color: #fbbf24;
    flex: none;
}

.basics-training-error > div {
    display: flex;
    flex-direction: column;
    gap: 2px;
    flex: 1;
    min-width: 0;
}

.basics-training-error span { font-size: 0.86rem; opacity: 0.8; }