<title>Koffan Maths Education Platform</title> <style> /* Reset and base */ *, *::before, *::after { box-sizing: border-box; } body { margin: 0; padding: 0; font-family: 'Inter', sans-serif; background: #ffffff; color: #374151; line-height: 1.5; font-size: 16px; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; user-select: text; } a { color: #3b82f6; text-decoration: none; } a:hover, a:focus { text-decoration: underline; }

/* Layout containers */ #app { display: grid; grid-template-areas: "header header header" "sidebar main right"; grid-template-columns: 300px 1fr 320px; grid-template-rows: 60px 1fr; height: 100vh; overflow: hidden; }

/* Responsive grid */ @media (max-width: 1024px) { #app { grid-template-columns: 250px 1fr; grid-template-areas: "header header" "sidebar main" "sidebar right"; grid-template-rows: 60px 1fr 1fr; height: 100vh; } } @media (max-width: 640px) { #app { display: flex; flex-direction: column; height: 100vh; } }

/* Header */ header { grid-area: header; background: linear-gradient(90deg, #0f3460, #0891b2); color: white; display: flex; align-items: center; justify-content: space-between; padding: 0 24px; position: sticky; top: 0; z-index: 1000; } header .logo { font-weight: 700; font-size: 1.5rem; letter-spacing: 1px; user-select: none; } header .header-left, header .header-right { display: flex; align-items: center; } header .header-left input[type="search"] { border-radius: 24px; border: none; padding: 8px 16px; font-size: 14px; outline: none; width: 240px; transition: width 0.3s ease; } header .header-left input[type="search"]:focus { width: 320px; } header .icon-button { background: none; border: none; color: white; cursor: pointer; position: relative; margin-left: 20px; font-size: 24px; user-select: none; display: flex; align-items: center; } header .icon-button .badge { position: absolute; top: 2px; right: 2px; background: #ef4444; color: white; font-size: 10px; font-weight: 700; border-radius: 9999px; padding: 2px 6px; } header .progress-overview { font-weight: 600; font-size: 14px; margin-left: 20px; user-select: none; } header .profile { width: 36px; height: 36px; border-radius: 50%; background: linear-gradient(135deg, #0891b2 0%, #0f3460 100%); color: white; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 18px; cursor: pointer; user-select: none; }

/* Sidebar Left / #sidebar { grid-area: sidebar; border-right: 1px solid #e5e7eb; padding: 20px 16px; overflow-y: auto; background: #f9fafb; } #sidebar h2 { font-size: 1.2rem; font-weight: 700; margin-bottom: 16px; user-select: none; } #sidebar input[type="text"] { width: 100%; padding: 8px 12px; border-radius: 8px; border: 1px solid #d1d5db; margin-bottom: 20px; font-size: 14px; } #sidebar .course-list { list-style: none; padding: 0; margin: 0; } #sidebar .course-list li { padding: 10px 12px; border-radius: 12px; margin-bottom: 8px; cursor: pointer; display: flex; align-items: center; justify-content: space-between; transition: background-color 0.3s ease; } #sidebar .course-list li:hover, #sidebar .course-list li.active { background: #dbeafe; } #sidebar .course-list li .title { font-weight: 600; font-size: 14px; flex: 1; } #sidebar .course-list li .progress-ring { position: relative; width: 36px; height: 36px; } / Progress ring SVG */ .progress-ring circle { transition: stroke-dashoffset 0.35s; transform: rotate(-90deg); transform-origin: 50% 50%; }

/* Middle Content */ #main-content { grid-area: main; background: white; padding: 20px 32px; overflow-y: auto; display: flex; flex-direction: column; } #main-content h1 { font-size: 2rem; font-weight: 700; margin-bottom: 12px; user-select: none; } #main-content .lesson-content { margin-bottom: 24px; flex: 1; }

/* Video player container / .video-player-container { position: relative; max-width: 100%; border-radius: 12px; overflow: hidden; background: black; box-shadow: 0 4px 12px rgb(0 0 0 / 0.15); margin-bottom: 20px; } video { width: 100%; display: block; } / Custom controls */ .video-controls { background: rgba(255 255 255 / 0.85); display: flex; align-items: center; padding: 8px 16px; gap: 12px; user-select: none; } .video-controls button { background: none; border: none; cursor: pointer; color: #0891b2; font-size: 24px; padding: 4px; } .video-progress-container { flex: 1; position: relative; height: 6px; background: #e5e7eb; border-radius: 3px; cursor: pointer; } .video-progress-filled { position: absolute; left: 0; top: 0; bottom: 0; background: #0f3460; border-radius: 3px; width: 0%; }

/* Transcript area */ .transcript { margin-top: 12px; font-size: 14px; background: #f9fafb; border-radius: 8px; padding: 12px 16px; max-height: 160px; overflow-y: auto; color: #4b5563; }

/* Quiz container / .quiz-container { margin-top: 12px; border-radius: 12px; padding: 24px; border: 1px solid #d1d5db; background: #f3f4f6; } .quiz-question { margin-bottom: 24px; } .quiz-question h3 { font-weight: 700; font-size: 16px; margin-bottom: 8px; } .quiz-options { list-style: none; padding: 0; margin: 0; } .quiz-options li { margin-bottom: 8px; } .quiz-options label { cursor: pointer; display: flex; align-items: center; gap: 12px; font-size: 15px; user-select: none; } input[type="radio"], input[type="checkbox"] { cursor: pointer; accent-color: #0f3460; } / Short answer / .quiz-short-answer input[type="text"] { width: 100%; border-radius: 8px; border: 1px solid #9ca3af; padding: 10px 12px; font-size: 14px; } .quiz-feedback { margin-top: 6px; font-weight: 600; } .quiz-feedback.correct { color: #22c55e; } .quiz-feedback.incorrect { color: #ef4444; } button.quiz-submit { background: #0f3460; border: none; color: white; padding: 12px 24px; border-radius: 16px; font-weight: 700; font-size: 16px; cursor: pointer; user-select: none; transition: background-color 0.3s ease; } button.quiz-submit:hover { background: #0891b2; } button.quiz-submit:disabled { background: #94a3b8; cursor: not-allowed; } / Quiz score summary */ .quiz-score { font-weight: 700; font-size: 16px; margin-top: 20px; user-select: none; }

/* Right Sidebar / #right-sidebar { grid-area: right; background: #f9fafb; padding: 20px 16px; border-left: 1px solid #e5e7eb; overflow-y: auto; display: flex; flex-direction: column; gap: 24px; } #right-sidebar h2 { font-size: 1.2rem; font-weight: 700; user-select: none; margin-bottom: 12px; } / Progress sidebar / .progress-sidebar { user-select: none; } .progress-bar { position: relative; height: 20px; background: #e5e7eb; border-radius: 12px; overflow: hidden; } .progress-bar-fill { height: 100%; background: #0891b2; border-radius: 12px 0 0 12px; width: 0%; transition: width 1s cubic-bezier(0.4, 0, 0.2, 1); } .progress-percent { margin-top: 4px; font-size: 14px; font-weight: 600; color: #374151; } / Notes area */ #notes-area { flex: 1; display: flex; flex-direction: column; } #notes-area textarea { resize: vertical; border-radius: 10px; border: 1px solid #d1d5db; padding: 12px; font-size: 14px; font-family: 'Inter', sans-serif; min-height: 80px; flex: 1; } #notes-area .btn-save { margin-top: 8px; background: #0f3460; border: none; color: white; padding: 10px; border-radius: 14px; font-weight: 700; cursor: pointer; user-select: none; transition: background-color 0.3s ease; } #notes-area .btn-save:disabled { background: #94a3b8; cursor: not-allowed; } #notes-area .btn-save:hover:not(:disabled) { background: #0891b2; }

/* Discussion */ #discussion-area { max-height: 220px; overflow-y: auto; background: white; border-radius: 12px; border: 1px solid #d1d5db; padding: 12px; } #discussion-area ul { list-style: none; padding: 0; margin: 0; } #discussion-area li { border-bottom: 1px solid #e5e7eb; padding: 8px 0; } #discussion-area li:last-child { border-bottom: none; } .discussion-comment { font-size: 14px; color: #374151; user-select: text; } .discussion-header { font-weight: 600; font-size: 13px; color: #6b7280; margin-bottom: 6px; } #discussion-input { margin-top: 8px; display: flex; gap: 8px; } #discussion-input input[type="text"] { flex: 1; border: 1px solid #d1d5db; border-radius: 12px; padding: 8px 12px; font-size: 14px; } #discussion-input button { background: #0f3460; border: none; border-radius: 12px; padding: 8px 16px; color: white; font-weight: 700; cursor: pointer; } #discussion-input button:disabled { background: #94a3b8; cursor: not-allowed; } #discussion-input button:hover:not(:disabled) { background: #0891b2; }

/* Resources links */ #resources-area ul { list-style: none; margin: 0; padding: 0; } #resources-area li { margin-bottom: 8px; } #resources-area li a { font-weight: 600; font-size: 14px; color: #0891b2; }

/* Assignment submission */ #assignment-submission { margin-top: 16px; border-radius: 12px; padding: 16px; border: 1px solid #d1d5db; background: #f3f4f6; } #assignment-submission label { display: block; margin-bottom: 8px; font-weight: 600; } #assignment-submission input[type="file"] { width: 100%; } #assignment-submission button.submit-btn { margin-top: 10px; background: #0f3460; border: none; border-radius: 14px; padding: 10px 20px; color: white; font-weight: 700; cursor: pointer; user-select: none; transition: background-color 0.3s ease; } #assignment-submission button.submit-btn:disabled { background: #94a3b8; cursor: not-allowed; } #assignment-submission button.submit-btn:hover:not(:disabled) { background: #0891b2; }

/* Gradebook */ #gradebook { margin-top: 24px; } #gradebook table { width: 100%; border-collapse: collapse; font-size: 14px; } #gradebook th, #gradebook td { border: 1px solid #d1d5db; padding: 8px 12px; text-align: left; } #gradebook th { background: #e5e7eb; font-weight: 700; }

/* Study Scheduler */ #study-scheduler { margin-top: 24px; } #study-scheduler h3 { margin-bottom: 12px; } #study-calendar { font-family: 'Inter', sans-serif; background: white; border-radius: 12px; padding: 16px; box-shadow: 0 4px 8px rgb(0 0 0 / 0.05); max-height: 300px; overflow-y: auto; } #study-calendar table { width: 100%; border-collapse: collapse; font-size: 14px; } #study-calendar th, #study-calendar td { border: 1px solid #d1d5db; padding: 8px 6px; text-align: center; user-select: none; } #study-calendar th { background: #e5e7eb; font-weight: 700; } #study-calendar td.deadline { background: #fde68a; cursor: pointer; font-weight: 700; } #study-calendar td.today { background: #dbeafe; font-weight: 700; }

/* Flashcards */ #flashcards { margin-top: 24px; user-select: none; } #flashcard { background: #f9fafb; border-radius: 16px; padding: 24px; box-shadow: 0 4px 12px rgba(0,0,0,0.1); text-align: center; font-size: 18px; min-height: 120px; display: flex; flex-direction: column; justify-content: center; cursor: pointer; user-select: none; } #flashcard .front, #flashcard .back { user-select: text; } #flashcard-buttons { margin-top: 16px; display: flex; gap: 16px; justify-content: center; } #flashcard-buttons button { padding: 12px 20px; border: none; border-radius: 14px; cursor: pointer; font-weight: 700; font-size: 14px; background: #0f3460; color: white; user-select: none; transition: background-color 0.3s ease; } #flashcard-buttons button:hover { background: #0891b2; } #flashcard-buttons button:disabled { background: #94a3b8; cursor: not-allowed; }

/* Group Study Rooms */ #group-study-rooms { margin-top: 24px; } #group-study-rooms ul { list-style: none; padding: 0; margin: 0; } #group-study-rooms li { background: white; border-radius: 12px; padding: 12px 16px; margin-bottom: 12px; box-shadow: 0 2px 8px rgb(0 0 0 / 0.05); cursor: pointer; user-select: none; }

#group-study-chat { background: white; border-radius: 12px; margin-top: 12px; padding: 12px; height: 150px; overflow-y: auto; font-size: 14px; } #group-study-message-input { margin-top: 8px; display: flex; gap: 8px; } #group-study-message-input input[type="text"] { flex: 1; padding: 8px 12px; border-radius: 12px; border: 1px solid #d1d5db; font-size: 14px; } #group-study-message-input button { background: #0f3460; border: none; border-radius: 12px; padding: 8px 16px; color: white; font-weight: 700; cursor: pointer; } #group-study-message-input button:disabled { background: #94a3b8; cursor: not-allowed; } #group-study-message-input button:hover:not(:disabled) { background: #0891b2; }

/* Achievement badges & notifications / #achievements { margin-top: 24px; } .badge-list { display: flex; gap: 12px; flex-wrap: wrap; } .badge { border-radius: 16px; padding: 8px 12px; background: #0891b2; color: white; font-weight: 700; display: inline-flex; align-items: center; gap: 8px; user-select: none; box-shadow: 0 4px 15px rgba(8 145 178 / 0.5); cursor: default; } .badge-icon { font-size: 18px; } / Badge notification popup */ #achievement-notification { position: fixed; top: 16px; right: 16px; background: #0891b2; color: white; padding: 16px 24px; border-radius: 16px; box-shadow: 0 4px 16px rgba(8 145 178 / 0.7); display: none; align-items: center; gap: 12px; font-weight: 700; user-select: none; z-index: 1100; } #achievement-notification .material-icons { font-size: 28px; animation: popAnimation 0.6s ease forwards; } @keyframes popAnimation { 0% { transform: scale(0.5); opacity: 0; } 50% { transform: scale(1.3); opacity: 1; } 100% { transform: scale(1); opacity: 1; } }

/* Scrollbar styling for webkit */ ::-webkit-scrollbar { width: 10px; height: 10px; } ::-webkit-scrollbar-track { background: #f9fafb; } ::-webkit-scrollbar-thumb { background-color: #0891b2; border-radius: 10px; }

</style>

Koffan Maths

notifications 3

Progress: 0%

K

Courses

<h2>My Study Plan</h2>
<ul id="study-plan" aria-live="polite" aria-relevant="additions"></ul>

Welcome to Koffan Maths

Select a course and lesson to start learning.

Course Progress

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<section id="notes-area" aria-label="Note taking area">
  <h2>Notes</h2>
  <textarea id="notes-textarea" placeholder="Write your notes here..." aria-multiline="true" rows="6"></textarea>
  <button class="btn-save" id="notes-save-btn" disabled>Save Note</button>
</section>

<section id="discussion-area" aria-label="Discussion forum">
  <h2>Discussion</h2>
  <ul id="discussion-list"></ul>
  <div id="discussion-input">
    <input type="text" id="discussion-text" placeholder="Add a comment..." aria-label="Add a comment"/>
    <button id="discussion-submit" disabled>Post</button>
  </div>
</section>

<section id="resources-area" aria-label="Lesson resources">
  <h2>Resources</h2>
  <ul id="resources-list"></ul>
</section>

<section id="assignment-submission" aria-label="Assignment submission">
  <h2>Submit Assignment</h2>
  <label for="assignment-file">Upload File</label>
  <input type="file" id="assignment-file" aria-describedby="assignment-desc" />
  <button class="submit-btn" id="assignment-submit-btn" disabled>Submit</button>
  <p id="assignment-desc" style=