/* Theme palettes — all views use only these variables; switching data-theme on swaps the whole palette. No hardcoded colours below this block. */ :root, [data-theme="light"] { --bg: #f6f8fa; --surface: #ffffff; --surface-raised: #ffffff; --text: #1f2328; --text-muted: #57606a; --border: #d0d7de; --link: #0969da; --primary: #1f883d; --primary-text: #ffffff; --primary-hover: #1a7f37; --btn-secondary-bg: #ffffff; --btn-secondary-text: #1f883d; --btn-secondary-border: #1f883d; --pass: #1a7f37; --fail: #cf222e; --tag-bg: #ddf4ff; --tag-text: #0969da; --current-highlight: #ddf4ff; --current-badge: #0969da; --completion-bg: #eafaef; --completion-border: #1a7f37; --hint-bg: #fff8e1; --hint-border: #f0d98c; --chat-bg: #ffffff; --chat-answer-bg: #f6f8fa; --code-surface: #f6f8fa; --error-bg: #fff1f0; --input-bg: #ffffff; --input-text: #1f2328; --shadow-sm: 0 4px 16px rgba(0,0,0,.06); --shadow-chat: 0 6px 24px rgba(0,0,0,.18); --shadow-toggle: 0 2px 8px rgba(0,0,0,.2); } [data-theme="dark"] { --bg: #161b22; --surface: #0d1117; --surface-raised: #21262d; --text: #e6edf3; --text-muted: #8b949e; --border: #30363d; --link: #58a6ff; --primary: #238636; --primary-text: #ffffff; --primary-hover: #2ea043; --btn-secondary-bg: #21262d; --btn-secondary-text: #3fb950; --btn-secondary-border: #238636; --pass: #3fb950; --fail: #f85149; --tag-bg: #0d2044; --tag-text: #58a6ff; --current-highlight: #0d2044; --current-badge: #58a6ff; --completion-bg: #0d2a16; --completion-border: #238636; --hint-bg: #2a2515; --hint-border: #6e5709; --chat-bg: #21262d; --chat-answer-bg: #161b22; --code-surface: #161b22; --error-bg: #2a0d0d; --input-bg: #161b22; --input-text: #e6edf3; --shadow-sm: 0 4px 16px rgba(0,0,0,.4); --shadow-chat: 0 6px 24px rgba(0,0,0,.6); --shadow-toggle: 0 2px 8px rgba(0,0,0,.5); } /* Reset + base */ * { box-sizing: border-box; } body { margin: 0; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif; color: var(--text); background: var(--surface); } /* Header */ header { padding: 12px 24px; border-bottom: 1px solid var(--border); background: var(--bg); display: flex; align-items: center; justify-content: space-between; } header h1 { font-size: 18px; margin: 0; } .tag { font-size: 11px; background: var(--tag-bg); color: var(--tag-text); padding: 2px 6px; border-radius: 10px; vertical-align: middle; } .header-right { display: flex; align-items: center; gap: 16px; } /* Language switch */ .lang-switch { display: flex; gap: 4px; } .lang-switch button { background: var(--btn-secondary-bg); color: var(--text-muted); border: 1px solid var(--border); padding: 4px 10px; font-size: 12px; font-weight: 600; border-radius: 6px; cursor: pointer; } .lang-switch button:hover { background: var(--bg); } .lang-switch button.active { background: var(--primary); color: var(--primary-text); border-color: var(--primary); } /* Theme toggle */ .theme-toggle { display: inline-flex; align-items: center; gap: 5px; background: var(--btn-secondary-bg); color: var(--text-muted); border: 1px solid var(--border); padding: 4px 10px; font-size: 12px; font-weight: 600; border-radius: 6px; cursor: pointer; transition: background .15s, color .15s; } .theme-toggle:hover { background: var(--bg); color: var(--text); } .theme-toggle:focus-visible { outline: 2px solid var(--link); outline-offset: 2px; } .theme-toggle-icon { font-size: 14px; line-height: 1; } /* Main / layout */ main { max-width: 880px; margin: 0 auto; padding: 24px; } section { margin-bottom: 28px; } .markdown { line-height: 1.5; color: var(--text); } .markdown pre { background: var(--code-surface); padding: 12px; border-radius: 6px; overflow: auto; border: 1px solid var(--border); } .markdown code { background: var(--code-surface); padding: 2px 5px; border-radius: 4px; font-size: .9em; } /* Buttons (primary green by default) */ button { background: var(--primary); color: var(--primary-text); border: 0; padding: 8px 16px; border-radius: 6px; font-size: 14px; cursor: pointer; transition: background .15s; } button:hover { background: var(--primary-hover); } button:disabled { opacity: .6; cursor: wait; } /* CodeMirror editor */ label { display: block; font-weight: 600; margin: 12px 0 6px; color: var(--text); } .CodeMirror { border: 1px solid var(--border); border-radius: 6px; height: 240px; font-size: 14px; } /* Fallback for dark mode when material theme class hasn't applied yet */ [data-theme="dark"] .CodeMirror:not(.cm-s-material) { background: var(--code-surface); color: var(--text); } [data-theme="dark"] .CodeMirror-gutters { background: var(--code-surface); border-right: 1px solid var(--border); } [data-theme="dark"] .CodeMirror-linenumber { color: var(--text-muted); } /* Controls row */ .controls { margin-top: 12px; display: flex; align-items: center; gap: 12px; } .badge { font-size: 13px; color: var(--text-muted); } /* Results panel */ .results { margin-top: 20px; border: 1px solid var(--border); border-radius: 6px; padding: 16px; background: var(--surface-raised); } .results.hidden, .error.hidden { display: none; } .results ul { list-style: none; padding: 0; margin: 0; } .results li { padding: 6px 0; border-bottom: 1px solid var(--bg); font-family: monospace; font-size: 13px; color: var(--text); } .results li .outcome { font-weight: 700; margin-right: 8px; } .results li.passed .outcome { color: var(--pass); } .results li.failed .outcome, .results li.error .outcome { color: var(--fail); } .results li .message { display: block; color: var(--fail); white-space: pre-wrap; margin-top: 4px; } .error { background: var(--error-bg); color: var(--fail); padding: 10px; border-radius: 6px; white-space: pre-wrap; } /* Utility */ .hidden { display: none; } /* Lesson list */ .lesson-list { list-style: none; padding: 0; margin: 0; } .lesson-list li { border-bottom: 1px solid var(--border); } .lesson-list li a { display: block; padding: 12px 4px; color: var(--link); text-decoration: none; font-size: 16px; } .lesson-list li a:hover { text-decoration: underline; } .back-link { display: inline-block; margin-bottom: 16px; color: var(--text-muted); font-size: 14px; text-decoration: none; } .back-link:hover { text-decoration: underline; } /* Auth header controls */ .auth-status { display: flex; align-items: center; gap: 8px; font-size: 13px; } .auth-status button { background: var(--btn-secondary-bg); color: var(--btn-secondary-text); border: 1px solid var(--btn-secondary-border); padding: 4px 10px; font-size: 12px; font-weight: 600; border-radius: 6px; } .auth-status button:hover { background: var(--bg); } .auth-user { display: flex; align-items: center; gap: 8px; } .auth-user .auth-user { display: inline; } .auth-user.hidden { display: none; } .auth-email-link { color: var(--text); font-weight: 600; text-decoration: none; } .auth-email-link:hover { text-decoration: underline; } /* Auth gate — inline login/register page */ .auth-gate { display: flex; justify-content: center; padding-top: 24px; } .auth-gate.hidden { display: none; } .auth-card { background: var(--surface-raised); border: 1px solid var(--border); border-radius: 10px; padding: 28px 28px 20px; width: 340px; max-width: 90vw; box-shadow: var(--shadow-sm); } .auth-card h2 { margin: 0 0 16px; font-size: 18px; color: var(--text); } .auth-card label { font-weight: 600; margin: 12px 0 4px; font-size: 13px; color: var(--text); } .auth-card input { width: 100%; padding: 8px 10px; border: 1px solid var(--border); border-radius: 6px; font-size: 14px; background: var(--input-bg); color: var(--input-text); } .auth-card button[type="submit"] { width: 100%; margin-top: 16px; } .form-error { color: var(--fail); font-size: 13px; margin: 10px 0 0; } .form-error.hidden { display: none; } .form-switch { font-size: 13px; color: var(--text-muted); margin: 14px 0 0; text-align: center; } .form-switch a { color: var(--link); text-decoration: none; } .form-switch a:hover { text-decoration: underline; } #confirm-pending p { font-size: 14px; line-height: 1.5; color: var(--text); } /* Lesson-list progression states */ .lesson-list li { display: flex; align-items: center; gap: 8px; padding-right: 4px; } .lesson-list li.lesson-current a { font-weight: 700; } .lesson-list li.lesson-current { background: var(--current-highlight); border-radius: 6px; } .lesson-list li.lesson-locked { color: var(--text-muted); } .lesson-locked-title { display: block; padding: 12px 4px; cursor: not-allowed; } .lock-indicator { font-size: 13px; color: var(--text-muted); } .completed-badge { color: var(--pass); font-size: 13px; font-weight: 600; } .current-badge { color: var(--current-badge); font-size: 13px; font-weight: 600; } .locked-hint { color: var(--fail); font-size: 13px; margin: 0 0 12px; } .locked-hint.hidden { display: none; } /* Lesson-completed CTA */ .completion { margin-top: 20px; padding: 16px; border: 1px solid var(--completion-border); border-radius: 6px; background: var(--completion-bg); } .completion.hidden { display: none; } .completion-text { color: var(--pass); font-weight: 700; margin: 0 0 12px; } #all-complete-msg { font-weight: 700; margin: 0; color: var(--text); } /* Profile / cabinet */ .auth-email-link { color: var(--text); font-weight: 600; text-decoration: none; } .profile-identity { font-size: 14px; color: var(--text-muted); margin: 0 0 8px; } .profile-summary { font-size: 16px; font-weight: 600; margin: 0 0 8px; color: var(--text); } .progress-track { background: var(--bg); border: 1px solid var(--border); border-radius: 6px; height: 14px; overflow: hidden; margin-bottom: 20px; } .progress-bar { background: var(--pass); height: 100%; width: 0; transition: width .3s; } .profile-lessons { list-style: none; padding: 0; margin: 0; } .profile-lessons li { display: flex; align-items: center; gap: 12px; padding: 10px 4px; border-bottom: 1px solid var(--border); color: var(--text); } .profile-lesson-title { flex: 1; } .profile-lessons li.lesson-completed .profile-lesson-status { color: var(--pass); font-weight: 600; } .profile-lessons li.lesson-locked { color: var(--text-muted); } .profile-lessons li.lesson-current { font-weight: 700; } .profile-lesson-counts { font-size: 13px; color: var(--text-muted); } /* Multi-exercise lesson */ .exercise-item { border-top: 1px solid var(--border); margin-top: 24px; padding-top: 20px; } .exercise-item:first-child { border-top: none; margin-top: 0; padding-top: 0; } .exercise-item-title { margin: 0 0 8px; font-size: 17px; color: var(--text); } .progress-counter { font-size: 14px; color: var(--text-muted); margin: 0 0 16px; font-weight: 600; } .solved-badge-active { color: var(--pass); font-weight: 600; } /* AI hint button — amber, visually distinct, works in light + dark */ .hint-btn { display: inline-flex; align-items: center; gap: 5px; background: #fff3cd; color: #5a4000; border: 1px solid #e6b800; border-radius: 6px; padding: 6px 14px; font-size: 14px; font-weight: 600; cursor: pointer; transition: background .15s, border-color .15s; } .hint-btn:hover { background: #ffe69c; border-color: #c69800; } .hint-btn:focus-visible { outline: 2px solid var(--link); outline-offset: 2px; } [data-theme="dark"] .hint-btn { background: #2d2200; color: #ffd55a; border-color: #6e5709; } [data-theme="dark"] .hint-btn:hover { background: #3d2f00; border-color: #9e7c0c; } .hint-icon { font-size: 16px; line-height: 1; } .hint-text { margin: 10px 0 0; padding: 10px 12px; background: var(--hint-bg); border: 1px solid var(--hint-border); border-radius: 6px; font-size: 14px; white-space: pre-wrap; color: var(--text); } /* AI floating chat widget */ .ai-chat-widget { position: fixed; right: 20px; bottom: 20px; z-index: 1000; display: flex; flex-direction: column; align-items: flex-end; gap: 10px; } .ai-chat-toggle { background: #1f6feb; color: #fff; border: none; border-radius: 20px; padding: 10px 16px; cursor: pointer; box-shadow: var(--shadow-toggle); font-size: 14px; } .ai-chat-toggle:hover { background: #1158c7; } .ai-chat-panel { width: 340px; max-width: 90vw; background: var(--chat-bg); border: 1px solid var(--border); border-radius: 10px; box-shadow: var(--shadow-chat); padding: 14px; display: flex; flex-direction: column; gap: 8px; } .ai-chat-panel.hidden { display: none; } .ai-chat-header { display: flex; justify-content: space-between; align-items: center; font-weight: 600; color: var(--text); } .ai-chat-close { background: none; border: none; cursor: pointer; color: var(--text-muted); font-size: 13px; padding: 2px 6px; } .ai-chat-close:hover { color: var(--text); background: none; } .ai-chat-intro { font-size: 13px; color: var(--text-muted); margin: 0; } .ai-chat-panel label { font-size: 12px; font-weight: 600; color: var(--text-muted); } .ai-chat-excerpt { min-height: 90px; resize: vertical; font-family: inherit; font-size: 13px; padding: 8px; border: 1px solid var(--border); border-radius: 6px; background: var(--input-bg); color: var(--input-text); } .ai-chat-question { font-size: 13px; padding: 8px; border: 1px solid var(--border); border-radius: 6px; background: var(--input-bg); color: var(--input-text); } .ai-chat-send { align-self: flex-start; background: #1f6feb; color: #fff; border: none; border-radius: 6px; padding: 8px 16px; cursor: pointer; } .ai-chat-send:hover { background: #1158c7; } .ai-chat-answer { font-size: 14px; background: var(--chat-answer-bg); border-radius: 6px; padding: 10px 12px; max-height: 240px; overflow-y: auto; color: var(--text); }