/* PyJunior CSS - Modern, kid-friendly, day/night themed */

:root, [data-theme="dark"] {
    --bg-main: #0b1120;
    --bg-card: #1e293b;
    --bg-card-header: #192231;
    --bg-card-sub: #172033;
    --bg-input: #0f172a;
    --bg-hover: #334155;
    
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --text-bright: #ffffff;
    
    --border-color: #334155;
    --border-focus: #38bdf8;
    
    --primary: #38bdf8;
    --primary-hover: #0284c7;
    --success: #34d399;
    --success-bg: rgba(52, 211, 153, 0.15);
    --warning: #fbbf24;
    --danger: #fb7185;
    --danger-bg: rgba(251, 113, 133, 0.15);

    /* Palette colors adaptive for dark mode */
    --color-sky: #38bdf8;
    --color-emerald: #34d399;
    --color-amber: #fbbf24;
    --color-rose: #fb7185;
    --color-purple: #c084fc;
    --color-pink: #f472b6;
    --color-teal: #2dd4bf;
    --color-indigo: #818cf8;

    --shadow-card: 0 4px 12px rgba(0, 0, 0, 0.35);
    --code-bg: #090e17;
    --gutter-bg: #0d1524;
    --gutter-color: #475569;
}

[data-theme="light"] {
    --bg-main: #f1f5f9;
    --bg-card: #ffffff;
    --bg-card-header: #f8fafc;
    --bg-card-sub: #f1f5f9;
    --bg-input: #ffffff;
    --bg-hover: #e2e8f0;
    
    --text-main: #0f172a;
    --text-muted: #475569;
    --text-bright: #0284c7;
    
    --border-color: #cbd5e1;
    --border-focus: #0284c7;
    
    --primary: #0284c7;
    --primary-hover: #0369a1;
    --success: #059669;
    --success-bg: rgba(5, 150, 105, 0.12);
    --warning: #d97706;
    --danger: #e11d48;
    --danger-bg: rgba(225, 29, 72, 0.1);

    /* Palette colors adaptive for light mode (richer, higher contrast on white) */
    --color-sky: #0284c7;
    --color-emerald: #047857;
    --color-amber: #b45309;
    --color-rose: #be123c;
    --color-purple: #7e22ce;
    --color-pink: #be185d;
    --color-teal: #0f766e;
    --color-indigo: #4338ca;

    --shadow-card: 0 4px 14px rgba(0, 0, 0, 0.08);
    --code-bg: #f8fafc;
    --gutter-bg: #f1f5f9;
    --gutter-color: #94a3b8;
}

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

html {
    height: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden;
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    font-size: 16px;
    background-color: var(--bg-main);
    color: var(--text-main);
    height: 100vh;
    height: 100dvh;
    max-height: 100vh;
    max-height: 100dvh;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* User adaptive colors */
.user-color-sky { color: var(--color-sky) !important; }
.user-color-emerald { color: var(--color-emerald) !important; }
.user-color-amber { color: var(--color-amber) !important; }
.user-color-rose { color: var(--color-rose) !important; }
.user-color-purple { color: var(--color-purple) !important; }
.user-color-pink { color: var(--color-pink) !important; }
.user-color-teal { color: var(--color-teal) !important; }
.user-color-indigo { color: var(--color-indigo) !important; }

/* Top Navbar */
.top-navbar {
    background-color: var(--bg-card);
    border-bottom: 2px solid var(--border-color);
    padding: 10px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 15px;
    box-shadow: var(--shadow-card);
    z-index: 100;
    flex-shrink: 0;
}

.brand-section {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-logo {
    font-size: 28px;
    background: linear-gradient(135deg, #38bdf8, #818cf8);
    border-radius: 12px;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(56, 189, 248, 0.4);
}

.brand-title {
    font-size: 20px;
    font-weight: 800;
    letter-spacing: -0.5px;
    color: var(--text-bright);
}

.brand-subtitle {
    font-size: 12px;
    color: var(--text-muted);
    font-weight: 500;
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.level-select {
    padding: 8px 14px;
    font-size: 15px;
    font-weight: 700;
    border-radius: 10px;
    background-color: var(--bg-input);
    color: var(--text-main);
    border: 2px solid var(--border-color);
    cursor: pointer;
    outline: none;
    transition: all 0.2s;
}

.level-select:focus {
    border-color: var(--border-focus);
}

.nav-buttons {
    display: flex;
    align-items: center;
    gap: 6px;
}

.user-section {
    display: flex;
    align-items: center;
    gap: 10px;
}

.score-badge {
    background: linear-gradient(135deg, rgba(251, 191, 36, 0.2), rgba(245, 158, 11, 0.1));
    border: 2px solid var(--warning);
    color: var(--warning);
    font-size: 16px;
    font-weight: 800;
    padding: 6px 14px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.status-pill {
    font-size: 12px;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 20px;
}

.status-online {
    background-color: var(--success-bg);
    color: var(--success);
}

.status-offline {
    background-color: var(--danger-bg);
    color: var(--danger);
}

/* Common Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 8px 16px;
    font-size: 15px;
    font-weight: 700;
    border-radius: 10px;
    border: none;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    user-select: none;
}

.btn:active {
    transform: scale(0.97);
}

.btn-icon-only {
    padding: 8px 12px;
}

.btn-primary {
    background-color: var(--primary);
    color: #ffffff;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
}

.btn-success {
    background-color: var(--success);
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.btn-secondary {
    background-color: var(--bg-hover);
    color: var(--text-main);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--border-focus);
}

/* Session Lock button variants */
.btn-lock-claim {
    background: linear-gradient(135deg, #10b981, #059669);
    color: #ffffff;
    box-shadow: 0 4px 10px rgba(16, 185, 129, 0.35);
}

.btn-lock-release {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: #ffffff;
    box-shadow: 0 4px 10px rgba(245, 158, 11, 0.35);
}

.btn-lock-locked {
    background: var(--bg-hover);
    color: var(--text-muted);
    border: 2px solid var(--border-color);
    cursor: not-allowed;
    opacity: 0.75;
}

.btn:disabled {
    cursor: not-allowed !important;
    opacity: 0.65;
    transform: none !important;
    box-shadow: none !important;
    pointer-events: auto;
}

/* Banner above workspace */
.coder-banner {
    padding: 8px 20px;
    font-size: 14px;
    font-weight: 600;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s;
    flex-shrink: 0;
}

.banner-unlocked {
    background-color: rgba(56, 189, 248, 0.1);
    color: var(--primary);
}

.banner-you {
    background-color: var(--success-bg);
    color: var(--success);
}

.banner-other {
    background-color: rgba(245, 158, 11, 0.15);
    color: var(--warning);
}

/* Main Grid Layout */
.main-workspace {
    flex: 1 1 0;
    min-height: 0;
    height: 100%;
    display: grid;
    grid-template-columns: 460px 1fr;
    grid-template-rows: 100%;
    gap: 16px;
    padding: 16px;
    overflow: hidden;
    box-sizing: border-box;
}

.column {
    display: flex;
    flex-direction: column;
    gap: 16px;
    height: 100%;
    min-height: 0;
    overflow: hidden;
}

/* Card Styling */
.card {
    background-color: var(--bg-card);
    border-radius: 14px;
    border: 2px solid var(--border-color);
    box-shadow: var(--shadow-card);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-height: 0;
}

.card-header {
    background-color: var(--bg-card-header);
    padding: 12px 18px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 2px solid var(--border-color);
    flex-shrink: 0;
}

.card-title {
    font-size: 16px;
    font-weight: 800;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-bright);
}

.card-body {
    padding: 16px;
    overflow-y: auto;
    overflow-x: hidden;
    flex: 1 1 0;
    min-height: 0;
}

/* Task Card */
.task-card {
    flex: 1 1 0;
    min-height: 0;
}

.task-badge-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.task-category-badge {
    background-color: rgba(56, 189, 248, 0.15);
    color: var(--primary);
    font-size: 13px;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 8px;
}

.badge-solved {
    background-color: var(--success-bg);
    color: var(--success);
    font-size: 13px;
    font-weight: 800;
    padding: 4px 10px;
    border-radius: 8px;
    border: 1px solid var(--success);
}

.task-headline {
    font-size: 20px;
    font-weight: 800;
    margin-bottom: 12px;
    color: var(--text-bright);
}

.task-story {
    font-size: 16px;
    line-height: 1.55;
    margin-bottom: 14px;
    color: var(--text-main);
}

.task-goal-box {
    background-color: var(--bg-card-sub);
    border-left: 5px solid var(--primary);
    border-radius: 8px;
    padding: 12px 16px;
    margin-bottom: 14px;
}

.goal-label {
    font-size: 13px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--primary);
    margin-bottom: 4px;
}

.goal-text {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-bright);
}

.hints-wrapper {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 10px;
}

.hint-item {
    border: 1px dashed var(--border-color);
    border-radius: 8px;
    background-color: var(--bg-card-sub);
}

.hint-summary {
    padding: 8px 12px;
    font-weight: 700;
    font-size: 14px;
    cursor: pointer;
    user-select: none;
    color: var(--warning);
}

.hint-content {
    padding: 10px 14px;
    font-size: 15px;
    border-top: 1px dashed var(--border-color);
    color: var(--text-main);
    line-height: 1.4;
}

/* Chat Card */
.chat-card {
    flex: 1 1 0;
    min-height: 0;
}

.online-users-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    background-color: var(--bg-card-sub);
    border-bottom: 1px solid var(--border-color);
    font-size: 13px;
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: none;
    -ms-overflow-style: none;
    flex-shrink: 0;
}

.online-users-bar::-webkit-scrollbar {
    display: none;
}

.online-users-list {
    display: flex;
    gap: 6px;
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.online-users-list::-webkit-scrollbar {
    display: none;
}

.user-pill {
    background-color: var(--bg-hover);
    padding: 3px 10px;
    border-radius: 12px;
    font-weight: 700;
    white-space: nowrap;
    flex-shrink: 0;
}

.chat-messages-container {
    flex: 1 1 0;
    min-height: 0;
    overflow-y: auto;
    overflow-x: hidden !important;
    padding: 14px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.chat-messages-container::-webkit-scrollbar,
.card-body::-webkit-scrollbar,
.output-terminal::-webkit-scrollbar {
    width: 6px;
}

.chat-messages-container::-webkit-scrollbar-track,
.card-body::-webkit-scrollbar-track,
.output-terminal::-webkit-scrollbar-track {
    background: transparent;
}

.chat-messages-container::-webkit-scrollbar-thumb,
.card-body::-webkit-scrollbar-thumb,
.output-terminal::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 6px;
}

.chat-messages-container::-webkit-scrollbar-thumb:hover,
.card-body::-webkit-scrollbar-thumb:hover,
.output-terminal::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

.chat-bubble {
    padding: 8px 14px;
    border-radius: 12px;
    max-width: 90%;
    min-width: 0;
    box-sizing: border-box;
    word-break: break-word;
    overflow-wrap: anywhere;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
}

.chat-me {
    align-self: flex-end;
    background-color: rgba(56, 189, 248, 0.15);
    border: 1px solid var(--border-focus);
}

.chat-other {
    align-self: flex-start;
    background-color: var(--bg-hover);
    border: 1px solid var(--border-color);
}

.chat-header {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 3px;
    font-size: 12px;
    min-width: 0;
    flex-wrap: wrap;
}

.chat-author {
    font-weight: 800;
    word-break: break-word;
    overflow-wrap: anywhere;
}

.chat-time {
    color: var(--text-muted);
    font-size: 11px;
    flex-shrink: 0;
}

.chat-content {
    font-size: 15px;
    line-height: 1.4;
    word-break: break-word;
    overflow-wrap: anywhere;
    white-space: pre-wrap;
    min-width: 0;
}

.chat-chips-row {
    display: flex;
    gap: 6px;
    padding: 6px 12px;
    overflow-x: auto;
    overflow-y: hidden;
    background-color: var(--bg-card-header);
    border-top: 1px solid var(--border-color);
    scrollbar-width: none;
    -ms-overflow-style: none;
    flex-shrink: 0;
}

.chat-chips-row::-webkit-scrollbar {
    display: none;
}

.chat-chip {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 4px 10px;
    font-size: 12px;
    font-weight: 600;
    border-radius: 14px;
    cursor: pointer;
    white-space: nowrap;
}

.chat-chip:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.chat-input-row {
    display: flex;
    padding: 8px 12px;
    gap: 8px;
    background-color: var(--bg-card-header);
    border-top: 1px solid var(--border-color);
    flex-shrink: 0;
}

.chat-input-field {
    flex: 1;
    padding: 8px 12px;
    font-size: 15px;
    border-radius: 8px;
    border: 2px solid var(--border-color);
    background-color: var(--bg-input);
    color: var(--text-main);
    outline: none;
}

.chat-input-field:focus {
    border-color: var(--border-focus);
}

/* Right Column: Code Editor & Output */
.editor-card {
    flex: 1.4 1 0;
    min-height: 0;
}

.editor-card.read-only-mode {
    border-color: var(--warning);
}

.editor-toolbar {
    display: flex;
    align-items: center;
    gap: 8px;
}

.font-size-controls {
    display: flex;
    align-items: center;
    gap: 4px;
    background-color: var(--bg-input);
    padding: 2px 6px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    font-size: 13px;
    font-weight: 700;
}

.btn-font {
    background: none;
    border: none;
    color: var(--text-main);
    cursor: pointer;
    padding: 2px 6px;
    font-weight: 800;
    border-radius: 4px;
}

.btn-font:hover {
    background-color: var(--bg-hover);
}

/* Custom Code Editor with Gutter and Highlight Layer */
.editor-wrapper {
    position: relative;
    flex: 1;
    display: flex;
    background-color: var(--code-bg);
    overflow: hidden;
    min-height: 0;
}

.gutter {
    width: 48px;
    background-color: var(--gutter-bg);
    color: var(--gutter-color);
    font-family: 'JetBrains Mono', 'Fira Code', 'Courier New', Courier, monospace;
    font-size: 18px;
    line-height: 1.6;
    padding: 16px 8px 16px 0;
    text-align: right;
    user-select: none;
    overflow: hidden;
    border-right: 1px solid var(--border-color);
}

.code-area {
    position: relative;
    flex: 1;
    overflow: hidden;
    font-family: 'JetBrains Mono', 'Fira Code', 'Courier New', Courier, monospace;
    font-size: 18px;
    line-height: 1.6;
}

.highlight-layer, .code-input {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    padding: 16px;
    margin: 0;
    border: none;
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
    tab-size: 4;
    white-space: pre;
    word-break: normal;
    word-wrap: normal;
    overflow: auto;
    box-sizing: border-box;
}

.highlight-layer {
    pointer-events: auto; /* Required for hover tips! */
    color: var(--text-main);
    background: transparent;
    z-index: 2;
}

.highlight-layer code {
    font-family: inherit;
}

.code-input {
    color: transparent;
    background: transparent;
    caret-color: var(--primary);
    resize: none;
    outline: none;
    z-index: 3;
}

.is-readonly .code-input {
    cursor: not-allowed;
}

/* Syntax Highlighting Colors */
.tok-comment { color: #64748b; font-style: italic; }
.tok-string { color: #34d399; }
.tok-number { color: #f59e0b; }
.tok-keyword { color: #c084fc; font-weight: 700; }
.tok-builtin { color: #38bdf8; font-weight: 700; }
.tok-operator { color: #f43f5e; font-weight: bold; }
.tok-punct { color: #94a3b8; }
.tok-ident { color: var(--text-main); }

/* Interactive Hover Tokens */
.tok-interactive {
    cursor: help;
    text-decoration: underline dotted 2px rgba(56, 189, 248, 0.6);
    text-underline-offset: 3px;
    pointer-events: auto;
}

.tok-interactive:hover {
    background-color: rgba(56, 189, 248, 0.25);
    border-radius: 4px;
}

/* Hover Tooltip Box */
.hover-tooltip {
    position: absolute;
    width: 330px;
    background-color: var(--bg-card);
    border: 2px solid var(--border-focus);
    border-radius: 12px;
    padding: 14px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
    z-index: 1000;
    pointer-events: auto;
    transition: opacity 0.15s;
    font-family: system-ui, -apple-system, sans-serif;
    color: var(--text-main);
}

.hover-tooltip.hidden {
    display: none;
}

.tip-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 6px;
}

.tip-category {
    font-size: 11px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--primary);
    background-color: rgba(56, 189, 248, 0.15);
    padding: 2px 8px;
    border-radius: 6px;
}

.tip-token {
    font-family: monospace;
    font-weight: 700;
    font-size: 13px;
    color: var(--warning);
}

.tip-title {
    font-size: 15px;
    font-weight: 800;
    margin-bottom: 6px;
    color: var(--text-bright);
}

.tip-desc {
    font-size: 13px;
    line-height: 1.45;
    margin-bottom: 8px;
    color: var(--text-main);
}

.tip-section-label {
    font-size: 11px;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-top: 6px;
    margin-bottom: 2px;
}

.tip-code {
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 6px 10px;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 12px;
    line-height: 1.4;
    color: var(--text-bright);
    white-space: pre-wrap;
}

.example-code {
    color: var(--success);
}

/* Editor Action Bar (Bottom) */
.editor-actions-bar {
    background-color: var(--bg-card-header);
    border-top: 2px solid var(--border-color);
    padding: 10px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
}

.btn-big-run {
    font-size: 16px;
    padding: 10px 22px;
    border-radius: 12px;
}

.btn-big-verify {
    font-size: 16px;
    padding: 10px 24px;
    border-radius: 12px;
    background: linear-gradient(135deg, #10b981, #059669);
    color: #ffffff;
    box-shadow: 0 4px 14px rgba(16, 185, 129, 0.4);
}

.btn-big-verify:hover {
    background: linear-gradient(135deg, #059669, #047857);
}

/* Output Card */
.output-card {
    flex: 0.8 1 0;
    min-height: 0;
}

.output-terminal {
    background-color: var(--code-bg);
    padding: 16px;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 15px;
    line-height: 1.5;
    flex: 1 1 0;
    min-height: 0;
    overflow-y: auto;
    overflow-x: auto;
    border-radius: 0 0 12px 12px;
}

.out-stdout {
    color: var(--text-bright);
    white-space: pre-wrap;
}

.out-stderr {
    color: var(--danger);
    background-color: var(--danger-bg);
    padding: 10px 14px;
    border-radius: 8px;
    border-left: 4px solid var(--danger);
    margin-top: 8px;
    white-space: pre-wrap;
}

.out-empty {
    color: var(--text-muted);
    font-style: italic;
}

.out-meta {
    margin-top: 12px;
    font-size: 12px;
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
    padding-top: 6px;
}

/* Result Success and Failure Boxes */
.result-success-box {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.2), rgba(5, 150, 105, 0.1));
    border: 2px solid var(--success);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 12px;
}

.result-failure-box {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.2), rgba(217, 119, 6, 0.1));
    border: 2px solid var(--warning);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 12px;
}

.res-title {
    font-size: 18px;
    font-weight: 800;
    margin-bottom: 6px;
}

.result-success-box .res-title { color: var(--success); }
.result-failure-box .res-title { color: var(--warning); }

.res-desc {
    font-size: 15px;
    line-height: 1.4;
    margin-bottom: 8px;
}

.res-reward {
    font-size: 16px;
    font-weight: 700;
    color: var(--warning);
    margin-bottom: 12px;
}

.res-details {
    background-color: var(--bg-input);
    border-radius: 8px;
    padding: 10px;
    margin: 8px 0;
    font-family: monospace;
    font-size: 13px;
    white-space: pre-wrap;
}

.res-hint {
    font-size: 13px;
    color: var(--warning);
    font-weight: 600;
}

.btn-celebrate {
    background: linear-gradient(135deg, #38bdf8, #818cf8);
    color: #ffffff;
    font-size: 16px;
    padding: 10px 20px;
    border-radius: 10px;
    box-shadow: 0 4px 14px rgba(56, 189, 248, 0.4);
}

/* Profile Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    backdrop-filter: blur(4px);
}

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

.modal-card {
    background-color: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 16px;
    width: 440px;
    max-width: 90vw;
    box-shadow: var(--shadow-card);
    overflow: hidden;
}

.modal-header {
    background-color: var(--bg-card-header);
    padding: 14px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 2px solid var(--border-color);
}

.modal-title {
    font-size: 18px;
    font-weight: 800;
}

.modal-body {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.modal-footer {
    padding: 14px 20px;
    background-color: var(--bg-card-header);
    border-top: 2px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.form-input {
    width: 100%;
    padding: 10px 14px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 10px;
    border: 2px solid var(--border-color);
    background-color: var(--bg-input);
    color: var(--text-main);
    outline: none;
}

.form-input:focus {
    border-color: var(--border-focus);
}

.avatar-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
}

.avatar-option {
    font-size: 26px;
    background-color: var(--bg-input);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    padding: 8px;
    cursor: pointer;
    transition: all 0.2s;
}

.avatar-option:hover, .avatar-option.selected {
    border-color: var(--border-focus);
    background-color: var(--bg-hover);
    transform: scale(1.08);
}

.color-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

.color-option {
    height: 36px;
    border-radius: 8px;
    border: 3px solid transparent;
    cursor: pointer;
    transition: all 0.2s;
}

.color-option:hover, .color-option.selected {
    border-color: #ffffff;
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
    transform: scale(1.06);
}

/* Toast notifications */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 3000;
    pointer-events: none;
}

.toast-msg {
    background-color: var(--bg-card);
    border: 2px solid var(--border-focus);
    border-radius: 12px;
    padding: 12px 18px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
    min-width: 280px;
    max-width: 380px;
    animation: toast-slide 0.3s ease-out;
}

.toast-celebration {
    border-color: var(--warning);
    background: linear-gradient(135deg, var(--bg-card), #1e1b4b);
}

.toast-title {
    font-size: 15px;
    font-weight: 800;
    margin-bottom: 2px;
}

.toast-celebration .toast-title {
    color: var(--warning);
}

.toast-body {
    font-size: 13px;
    color: var(--text-main);
}

.toast-fadeout {
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.4s;
}

@keyframes toast-slide {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Desktop defaults for mobile-only elements */
.mobile-tabs-bar {
    display: none !important;
}

.btn-mobile-nav {
    display: none !important;
}

.mobile-card-actions {
    display: none !important;
}

.editor-hint-desktop {
    display: block;
}

.editor-actions-buttons {
    display: flex;
    gap: 10px;
}

.chat-unread-dot {
    display: none;
}

/* Responsive adjustments for Tablets & Mobile Screens (<= 900px) */
@media (max-width: 900px) {
    html, body {
        height: 100%;
        height: 100dvh;
        max-height: 100vh;
        max-height: 100dvh;
        overflow: hidden;
    }

    /* Compact Top Navigation */
    .top-navbar {
        padding: 6px 10px;
        gap: 6px;
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .brand-section {
        gap: 8px;
        flex-shrink: 0;
    }

    .brand-logo {
        width: 34px;
        height: 34px;
        font-size: 20px;
        border-radius: 9px;
    }

    .brand-title {
        font-size: 16px;
    }

    .brand-subtitle {
        display: none;
    }

    .nav-controls {
        gap: 5px;
        margin-left: auto;
        flex-wrap: nowrap;
        flex-shrink: 0;
    }

    .sound-text, .btn-text {
        display: none;
    }

    #conn-status {
        display: none;
    }

    .level-select {
        padding: 5px 8px;
        font-size: 13px;
        max-width: 125px;
        border-radius: 8px;
    }

    .btn-nav-arrow {
        padding: 5px 8px;
        font-size: 13px;
    }

    #score-display {
        padding: 4px 8px;
        font-size: 12px;
    }

    .coder-banner {
        font-size: 12px;
        padding: 4px 10px;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        line-height: 1.3;
    }

    /* Mobile Tab Bar */
    .mobile-tabs-bar {
        display: flex !important;
        background-color: var(--bg-card);
        border-bottom: 2px solid var(--border-color);
        padding: 4px 6px;
        gap: 4px;
        flex-shrink: 0;
        z-index: 90;
    }

    .mobile-tab-btn {
        flex: 1;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 5px;
        padding: 8px 4px;
        border: none;
        border-radius: 8px;
        background: transparent;
        color: var(--text-muted);
        font-weight: 700;
        font-size: 13px;
        cursor: pointer;
        position: relative;
        transition: all 0.15s ease;
        user-select: none;
        -webkit-tap-highlight-color: transparent;
    }

    .mobile-tab-btn:active {
        transform: scale(0.96);
    }

    .mobile-tab-btn.active {
        background-color: var(--bg-hover);
        color: var(--primary);
        box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
        font-weight: 800;
    }

    .tab-icon {
        font-size: 16px;
        line-height: 1;
    }

    .tab-label {
        font-size: 13px;
        line-height: 1;
    }

    .chat-unread-dot {
        position: absolute;
        top: 4px;
        right: 8px;
        width: 8px;
        height: 8px;
        border-radius: 50%;
        background-color: var(--danger);
        box-shadow: 0 0 6px var(--danger);
    }

    /* Workspace Switcher via CSS */
    .main-workspace {
        display: flex !important;
        flex-direction: column !important;
        padding: 8px !important;
        gap: 0 !important;
        overflow: hidden !important;
        height: 100% !important;
        min-height: 0 !important;
        flex: 1 1 0 !important;
    }

    .column {
        display: contents !important;
    }

    .main-workspace .card {
        display: none !important;
    }

    .main-workspace[data-active-tab="task"] .task-card,
    .main-workspace[data-active-tab="chat"] .chat-card,
    .main-workspace[data-active-tab="editor"] .editor-card,
    .main-workspace[data-active-tab="output"] .output-card {
        display: flex !important;
        width: 100% !important;
        height: 100% !important;
        flex: 1 1 0 !important;
        min-height: 0 !important;
        border-radius: 12px;
    }

    /* In-Card Mobile Actions */
    .mobile-card-actions {
        display: flex !important;
        margin-top: 16px;
    }

    .btn-mobile-nav {
        display: inline-flex !important;
        align-items: center;
        justify-content: center;
        gap: 6px;
        width: 100%;
        padding: 10px 14px;
        font-size: 14px;
        font-weight: 700;
    }

    .output-card .card-header .btn-mobile-nav {
        width: auto;
        padding: 6px 12px;
        font-size: 12px;
    }

    /* Task Card Details */
    .task-card .card-body {
        padding: 14px;
    }

    .task-headline {
        font-size: 18px;
        margin-bottom: 8px;
    }

    .task-story {
        font-size: 14px;
        line-height: 1.5;
        margin-bottom: 12px;
    }

    .task-goal-box {
        padding: 12px;
        margin-bottom: 14px;
    }

    .goal-label {
        font-size: 13px;
    }

    .goal-text {
        font-size: 14px;
    }

    /* Editor Card Details */
    .editor-hint-desktop {
        display: none !important;
    }

    .editor-actions-bar {
        padding: 8px 10px;
        gap: 8px;
    }

    .editor-actions-buttons {
        width: 100%;
        display: flex;
        gap: 8px;
    }

    .btn-big-run, .btn-big-verify {
        flex: 1;
        padding: 10px 6px;
        font-size: 13px;
        font-weight: 700;
        text-align: center;
        justify-content: center;
        display: inline-flex;
        align-items: center;
    }

    .gutter {
        width: 36px;
        padding: 12px 4px 12px 0;
        font-size: 14px;
        line-height: 1.5;
    }

    .code-area {
        font-size: 14px;
        line-height: 1.5;
    }

    .highlight-layer, .code-input {
        padding: 12px 8px;
        font-size: 14px;
        line-height: 1.5;
    }

    .font-size-label-text {
        display: none;
    }

    .font-size-controls {
        padding: 2px 4px;
    }

    /* Chat Card Details */
    .chat-chips-row {
        padding: 6px 8px;
        gap: 6px;
    }

    .chat-chip {
        font-size: 12px;
        padding: 4px 8px;
    }

    .chat-input-row {
        padding: 6px 8px;
        gap: 6px;
    }

    .chat-input-field {
        font-size: 14px;
        padding: 8px 10px;
    }

    /* Output Card Details */
    .output-terminal {
        padding: 12px;
        font-size: 13px;
    }

    .result-success-box, .result-fail-box {
        padding: 12px;
        margin-bottom: 12px;
    }

    .res-title {
        font-size: 16px;
    }

    .res-desc {
        font-size: 13px;
    }

    /* Modals */
    .modal-card {
        width: 92vw;
        max-width: 92vw;
        max-height: 90vh;
        max-height: 90dvh;
        padding: 14px;
        overflow-y: auto;
    }

    .avatar-grid {
        grid-template-columns: repeat(5, 1fr);
        gap: 6px;
    }

    .color-grid {
        gap: 6px;
    }
}

/* Extra small devices (<= 480px) */
@media (max-width: 480px) {
    .top-navbar {
        padding: 6px 8px;
    }

    .brand-title {
        font-size: 15px;
    }

    .level-select {
        max-width: 105px;
        font-size: 12px;
        padding: 4px 6px;
    }

    .profile-name {
        max-width: 50px;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
        display: inline-block;
        vertical-align: middle;
    }

    .tab-label {
        font-size: 11px;
    }

    .mobile-tab-btn {
        padding: 6px 2px;
        gap: 4px;
    }
}