Paper / index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Paper</title>
<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link href="https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap"
rel="stylesheet">
<style>
:root {
/* --- Colorful & Playful DARK --- */
--bg-primary: #0f0f1a;
--bg-secondary: #1a1a2e;
--bg-tertiary: #252540;
--bg-card: rgba(25, 25, 45, 0.95);
--text-primary: #ffffff;
--text-secondary: #b8b8d0;
--text-muted: #7070a0;
--accent-pink: #ff6b9d;
--accent-purple: #a855f7;
--accent-blue: #3b82f6;
--accent-yellow: #fbbf24;
--gradient-primary: linear-gradient(135deg, #ff6b9d 0%, #a855f7 50%, #3b82f6 100%);
--gradient-hover: linear-gradient(135deg, #ff4d8a 0%, #9333ea 50%, #2563eb 100%);
--success: #22c55e;
--warning: #f59e0b;
--error: #ef4444;
--border: rgba(168, 85, 247, 0.25);
--shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.3);
--shadow-glow: 0 8px 40px rgba(168, 85, 247, 0.15);
--radius: 24px;
--radius-sm: 16px;
--transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
html,
body {
height: 100%;
}
body {
font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
background: linear-gradient(135deg, #0f0f1a 0%, #1a1025 50%, #0f1520 100%);
background-attachment: fixed;
color: var(--text-primary);
line-height: 1.6;
position: relative;
}
body::before {
content: '';
position: fixed;
top: -50%;
left: -50%;
width: 200%;
height: 200%;
background:
radial-gradient(circle at 20% 30%, rgba(255, 107, 157, 0.25) 0%, transparent 40%),
radial-gradient(circle at 80% 70%, rgba(59, 130, 246, 0.2) 0%, transparent 40%),
radial-gradient(circle at 50% 50%, rgba(168, 85, 247, 0.15) 0%, transparent 50%);
animation: floatBg 20s ease-in-out infinite;
pointer-events: none;
z-index: 1;
}
@keyframes floatBg {
0%,
100% {
transform: translate(0, 0) rotate(0deg);
}
33% {
transform: translate(2%, 2%) rotate(1deg);
}
66% {
transform: translate(-1%, 1%) rotate(-1deg);
}
}
/* Login Screen */
.login-screen {
display: flex;
justify-content: center;
align-items: center;
height: 100%;
padding: 20px;
position: relative;
z-index: 2;
}
/* Flip Card Container */
.card-container {
width: 100%;
max-width: 420px;
perspective: 1000px;
}
.card-inner {
position: relative;
width: 100%;
transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
transform-style: preserve-3d;
}
.card-container.flipped .card-inner {
transform: rotateY(180deg);
}
.card-front,
.card-back {
text-align: center;
padding: 40px 36px;
border-radius: var(--radius);
background: var(--bg-card);
border: 2px solid var(--border);
box-shadow: var(--shadow-soft), var(--shadow-glow);
backface-visibility: hidden;
-webkit-backface-visibility: hidden;
}
.card-front {
position: relative;
z-index: 2;
animation: bounceIn 0.6s var(--transition);
}
.card-back {
position: absolute;
top: 0;
left: 0;
right: 0;
bottom: 0;
transform: rotateY(180deg);
z-index: 1;
}
@keyframes bounceIn {
0% {
opacity: 0;
transform: scale(0.9) translateY(20px);
}
50% {
transform: scale(1.02) translateY(-5px);
}
100% {
opacity: 1;
transform: scale(1) translateY(0);
}
}
.login-box h1 {
margin-bottom: 12px;
font-weight: 800;
font-size: 42px;
letter-spacing: -1px;
font-family: 'Plus Jakarta Sans', sans-serif;
background: var(--gradient-primary);
-webkit-background-clip: text;
-webkit-text-fill-color: transparent;
background-clip: text;
}
.login-box h1::after {
content: ' ✨';
-webkit-text-fill-color: initial;
}
.login-subtitle {
color: var(--text-secondary);
font-size: 16px;
margin-bottom: 32px;
font-weight: 500;
line-height: 1.6;
}
/* Info Icon & Card Back */
.info-icon {
position: absolute;
top: 16px;
right: 16px;
width: 28px;
height: 28px;
border-radius: 50%;
background: var(--bg-tertiary);
border: 1px solid var(--border);
color: var(--text-muted);
font-size: 14px;
font-weight: 600;
cursor: pointer;
display: flex;
align-items: center;
justify-content: center;
transition: var(--transition);
font-family: serif;
z-index: 5;
}
.info-icon:hover {
background: var(--accent-purple);
color: white;
border-color: var(--accent-purple);
transform: scale(1.1);
}
.back-icon {
position: absolute;
top: 16px;
right: 16px;
width: 28px;
height: 28px;
border-radius: 50%;
background: var(--bg-tertiary);
border: 1px solid var(--border);
color: var(--text-muted);
font-size: 18px;
font-weight: 300;
cursor: pointer;
display: flex;
align-items: center;
justify-content: center;
transition: var(--transition);
line-height: 1;
}
.back-icon:hover {
background: var(--accent-pink);
color: white;
border-color: var(--accent-pink);
transform: scale(1.1);
}
.info-title {
font-size: 22px;
font-weight: 700;
color: var(--text-primary);
margin-bottom: 20px;
background: var(--gradient-primary);
-webkit-background-clip: text;
-webkit-text-fill-color: transparent;
background-clip: text;
}
.info-list {
list-style: none;
padding: 0;
margin: 0 0 24px 0;
text-align: left;
max-height: 200px;
overflow-y: auto;
padding-right: 8px;
}
/* Info list scrollbar */
.info-list::-webkit-scrollbar {
width: 6px;
}
.info-list::-webkit-scrollbar-track {
background: var(--bg-tertiary);
border-radius: 6px;
}
.info-list::-webkit-scrollbar-thumb {
background: var(--gradient-primary);
border-radius: 6px;
}
.info-list::-webkit-scrollbar-thumb:hover {
background: var(--gradient-hover);
}
.info-list li {
color: var(--text-secondary);
font-size: 13px;
line-height: 1.7;
padding: 10px 0;
padding-left: 24px;
position: relative;
border-bottom: 1px solid var(--border);
}
.info-list li:last-child {
border-bottom: none;
}
.info-list li::before {
content: '✦';
position: absolute;
left: 0;
color: var(--accent-purple);
}
.info-list li strong {
color: var(--text-primary);
}
.info-link {
display: inline-flex;
align-items: center;
gap: 6px;
color: var(--accent-blue);
text-decoration: none;
font-weight: 600;
font-size: 13px;
transition: var(--transition);
padding: 10px 16px;
background: var(--bg-tertiary);
border-radius: 50px;
border: 1px solid var(--border);
}
.info-link:hover {
color: white;
background: var(--accent-blue);
border-color: var(--accent-blue);
}
.input-group {
position: relative;
margin-bottom: 24px;
}
.password-input {
width: 100%;
padding: 18px 24px;
font-size: 17px;
border: 2px solid var(--border);
border-radius: var(--radius-sm);
background: var(--bg-secondary);
color: var(--text-primary);
text-align: center;
letter-spacing: 3px;
outline: none;
transition: var(--transition);
font-family: 'Plus Jakarta Sans', monospace;
font-weight: 600;
}
.password-input:focus {
border-color: var(--accent-purple);
box-shadow: 0 0 0 4px rgba(168, 85, 247, 0.25), 0 0 30px rgba(168, 85, 247, 0.15);
background: var(--bg-tertiary);
transform: scale(1.02);
}
.password-input::placeholder {
color: var(--text-muted);
letter-spacing: normal;
font-family: 'Plus Jakarta Sans', sans-serif;
font-weight: 500;
}
.enter-btn {
width: 100%;
padding: 18px 32px;
background: var(--gradient-primary);
color: #ffffff;
border: none;
border-radius: var(--radius-sm);
font-size: 16px;
font-weight: 700;
cursor: pointer;
transition: var(--transition);
position: relative;
overflow: hidden;
text-transform: uppercase;
letter-spacing: 1.5px;
font-family: 'Plus Jakarta Sans', sans-serif;
box-shadow: 0 6px 25px rgba(255, 107, 157, 0.35);
}
.enter-btn:hover:not(:disabled) {
transform: translateY(-3px) scale(1.02);
box-shadow: 0 10px 35px rgba(255, 107, 157, 0.45);
background: var(--gradient-hover);
}
.enter-btn:active {
transform: translateY(0) scale(0.98);
}
.enter-btn:disabled {
opacity: 0.6;
cursor: not-allowed;
transform: none;
}
.error {
color: var(--error);
margin-top: 16px;
font-size: 14px;
min-height: 20px;
font-weight: 500;
}
/* Editor Screen */
.editor-screen {
display: none;
height: 100%;
background: transparent;
flex-direction: column;
position: relative;
z-index: 2;
}
.header {
padding: 16px 24px;
background: var(--bg-card);
border-bottom: 2px solid var(--border);
display: flex;
justify-content: space-between;
align-items: center;
backdrop-filter: blur(10px);
position: relative;
flex-shrink: 0;
}
.header-left {
display: flex;
align-items: center;
gap: 16px;
}
.app-title {
font-size: 26px;
font-weight: 800;
font-family: 'Plus Jakarta Sans', sans-serif;
letter-spacing: -0.5px;
background: var(--gradient-primary);
-webkit-background-clip: text;
-webkit-text-fill-color: transparent;
background-clip: text;
cursor: pointer;
transition: var(--transition);
}
.app-title:hover {
transform: scale(1.05);
}
.header-right {
display: flex;
align-items: center;
gap: 12px;
flex-wrap: wrap;
}
.save-status {
font-size: 12px;
font-weight: 700;
padding: 10px 18px;
border-radius: 50px;
background: var(--bg-tertiary);
color: var(--text-secondary);
border: 2px solid var(--border);
min-width: 90px;
text-align: center;
font-family: 'Plus Jakarta Sans', sans-serif;
text-transform: uppercase;
letter-spacing: 0.5px;
transition: var(--transition);
}
.save-status.saving {
background: var(--gradient-primary);
color: white;
border-color: transparent;
box-shadow: 0 4px 20px rgba(168, 85, 247, 0.3);
animation: wiggle 0.5s ease-in-out infinite;
}
@keyframes wiggle {
0%,
100% {
transform: rotate(-2deg);
}
50% {
transform: rotate(2deg);
}
}
.save-status.saved {
background: linear-gradient(135deg, var(--success) 0%, #10b981 100%);
color: white;
border-color: transparent;
box-shadow: 0 4px 15px rgba(34, 197, 94, 0.3);
}
.word-count {
font-size: 14px;
color: var(--text-secondary);
font-weight: 600;
font-family: 'Plus Jakarta Sans', sans-serif;
background: var(--bg-tertiary);
padding: 6px 14px;
border-radius: 20px;
}
.editor-container {
flex: 1;
position: relative;
margin: 20px;
border-radius: var(--radius);
background: var(--bg-card);
border: 2px solid var(--border);
box-shadow: var(--shadow-soft);
animation: paperUnfold 0.5s ease-out;
}
.editor {
width: 100%;
height: 100%;
padding: 28px 32px;
border: none;
outline: none;
font-family: 'Plus Jakarta Sans', sans-serif;
font-size: 17px;
font-weight: 500;
line-height: 1.9;
resize: none;
background: transparent;
color: var(--text-primary);
position: relative;
z-index: 2;
border-radius: var(--radius);
caret-color: var(--accent-purple);
}
.editor::placeholder {
color: var(--text-muted);
font-weight: 500;
}
/* Scrollbar styling */
.editor::-webkit-scrollbar {
width: 10px;
}
.editor::-webkit-scrollbar-track {
background: var(--bg-tertiary);
border-radius: 10px;
}
.editor::-webkit-scrollbar-thumb {
background: var(--gradient-primary);
border-radius: 10px;
}
.editor::-webkit-scrollbar-thumb:hover {
background: var(--gradient-hover);
}
/* Animation for mode switching */
.fade-in {
animation: fadeIn 0.4s ease-out;
}
@keyframes fadeIn {
from {
opacity: 0;
transform: translateY(20px) scale(0.98);
}
to {
opacity: 1;
transform: translateY(0) scale(1);
}
}
/* Focus improvements */
.password-input:focus,
.editor:focus {
outline: none;
}
@keyframes slideUp {
from {
opacity: 0;
transform: translateY(30px);
}
to {
opacity: 1;
transform: translateY(0);
}
}
@keyframes paperUnfold {
from {
opacity: 0;
transform: scale(0.95) rotateX(5deg);
}
to {
opacity: 1;
transform: scale(1) rotateX(0deg);
}
}
/* Texture overlay for paper feel */
.editor-container::after {
content: '';
position: absolute;
top: 0;
left: 0;
right: 0;
bottom: 0;
background: var(--paper-texture);
opacity: 0.1;
pointer-events: none;
z-index: 1;
border-radius: var(--radius);
}
/* Mobile Responsive */
@media (max-width: 600px) {
.header {
padding: 12px 16px;
gap: 8px;
}
.app-title {
font-size: 20px;
}
.header-right {
flex-wrap: nowrap;
gap: 8px;
}
.save-status {
font-size: 10px;
padding: 6px 12px;
min-width: 70px;
letter-spacing: 0;
}
.word-count {
font-size: 11px;
padding: 4px 10px;
}
.editor-container {
margin: 12px;
}
.editor {
padding: 20px;
font-size: 16px;
}
.card-front,
.card-back {
padding: 28px 20px;
}
.card-front h1 {
font-size: 32px;
}
.login-subtitle {
font-size: 14px;
margin-bottom: 24px;
}
.info-list {
margin-bottom: 16px;
}
.info-list li {
font-size: 13px;
padding: 6px 0;
padding-left: 20px;
}
.info-title {
font-size: 16px;
margin-bottom: 12px;
}
.info-link {
font-size: 11px;
padding: 8px 12px;
}
}
</style>
</head>
<body>
<div id="loginScreen" class="login-screen">
<div id="cardContainer" class="card-container">
<div class="card-inner">
<!-- Front: Login -->
<div class="card-front">
<div class="info-icon" onclick="flipCard()" title="Learn more">i</div>
<h1>Paper</h1>
<p class="login-subtitle">Perfect for temporary notes and secure sharing. Deleted after two days.
</p>
<div class="input-group">
<input type="password" id="passwordInput" class="password-input"
placeholder="min-8-char password" minlength="8" maxlength="100">
</div>
<button onclick="login()" class="enter-btn">Enter</button>
<div id="loginError" class="error"></div>
</div>
<!-- Back: Info -->
<div class="card-back">
<div class="back-icon" onclick="flipCard()" title="Back to login">X</div>
<h3 class="info-title">About Paper ✨</h3>
<ul class="info-list">
<li><strong>What is it?</strong> A secure notepad for temporary notes you can access from
anywhere.</li>
<li><strong>Encryption:</strong> Notes encrypted client-side with your password. Never sent to
server.</li>
<li><strong>Open Source:</strong> 100% open. Deployed on Hugging Face, Open for everyone to see.
</li>
<li><strong>Zero Access:</strong> Even the developer cannot read your notes. Only encrypted
blobs stored.</li>
<li><strong>Auto-Delete:</strong> Notes automatically deleted after 2 days of inactivity.</li>
<li><strong>Pro tip:</strong> Use a strong password! If someone guesses it... well, that's on
you 😅</li>
</ul>
<a href="https://github.com/jebin2/Paper" target="_blank" class="info-link">
🔗 View source on GitHub
</a>
</div>
</div>
</div>
</div>
<div id="editorScreen" class="editor-screen">
<div class="header">
<div class="header-left">
<div class="app-title" onclick="goToLogin()" style="cursor: pointer;" title="Go to login">Paper</div>
</div>
<div class="header-right">
<div id="wordCount" class="word-count">0 words</div>
<div id="saveStatus" class="save-status">Ready</div>
</div>
</div>
<div class="editor-container">
<textarea id="editor" class="editor" placeholder="Start typing..."></textarea>
</div>
</div>
<script>
let currentPassword = '';
let currentSalt = null;
let fileHash = '';
let saveTimeout = null;
let isWorking = false;
const PBKDF2_ITERATIONS = 250000;
// --- CARD FLIP ---
function flipCard() {
const container = document.getElementById('cardContainer');
container.classList.toggle('flipped');
}
// --- WORD COUNT ---
function updateWordCount() {
const text = document.getElementById('editor').value;
const words = text.trim() ? text.trim().split(/\s+/).length : 0;
const chars = text.length;
document.getElementById('wordCount').textContent = `${words} words, ${chars} chars`;
}
// --- CRYPTOGRAPHY (unchanged) ---
async function generateFilenameHash(password) {
const encoder = new TextEncoder();
const data = encoder.encode(password);
const hashBuffer = await crypto.subtle.digest('SHA-256', data);
const hashArray = Array.from(new Uint8Array(hashBuffer));
return hashArray.map(b => b.toString(16).padStart(2, '0')).join('').slice(0, 16);
}
async function deriveKey(password, salt) {
const encoder = new TextEncoder();
const keyMaterial = await crypto.subtle.importKey(
'raw',
encoder.encode(password),
{ name: 'PBKDF2' },
false,
['deriveKey']
);
return crypto.subtle.deriveKey(
{
name: 'PBKDF2',
salt: salt,
iterations: PBKDF2_ITERATIONS,
hash: 'SHA-256'
},
keyMaterial,
{ name: 'AES-GCM', length: 256 },
true,
['encrypt', 'decrypt']
);
}
async function encrypt(text, key) {
const encoder = new TextEncoder();
const data = encoder.encode(text);
const iv = crypto.getRandomValues(new Uint8Array(12));
const encryptedContent = await crypto.subtle.encrypt(
{ name: 'AES-GCM', iv: iv },
key,
data
);
const combined = new Uint8Array(iv.length + encryptedContent.byteLength);
combined.set(iv);
combined.set(new Uint8Array(encryptedContent), iv.length);
return btoa(String.fromCharCode.apply(null, combined));
}
async function decrypt(encryptedBase64, key) {
try {
const combined = Uint8Array.from(atob(encryptedBase64), c => c.charCodeAt(0));
const iv = combined.slice(0, 12);
const encryptedContent = combined.slice(12);
const decrypted = await crypto.subtle.decrypt(
{ name: 'AES-GCM', iv: iv },
key,
encryptedContent
);
return new TextDecoder().decode(decrypted);
} catch (error) {
console.error('Decryption failed:', error);
throw new Error('Decryption failed. Check password.');
}
}
function base64ToUint8Array(base64) {
const binaryString = atob(base64);
const len = binaryString.length;
const bytes = new Uint8Array(len);
for (let i = 0; i < len; i++) {
bytes[i] = binaryString.charCodeAt(i);
}
return bytes;
}
// --- APPLICATION LOGIC ---
document.getElementById('passwordInput').focus();
document.getElementById('passwordInput').addEventListener('keypress', e => {
if (e.key === 'Enter') login();
});
// iOS Safari viewport fix
function fixIOSViewport() {
const isIOS = /iPad|iPhone|iPod/.test(navigator.userAgent) && !window.MSStream;
if (isIOS) {
const vh = window.innerHeight * 0.01;
document.documentElement.style.setProperty('--vh', `${vh}px`);
window.addEventListener('resize', () => {
const vh = window.innerHeight * 0.01;
document.documentElement.style.setProperty('--vh', `${vh}px`);
});
}
}
// Call on page load
fixIOSViewport();
async function login() {
if (isWorking) return;
isWorking = true;
const password = document.getElementById('passwordInput').value;
const errorDiv = document.getElementById('loginError');
const enterBtn = document.querySelector('.enter-btn');
errorDiv.textContent = '';
if (password.length < 8) {
errorDiv.textContent = 'Password must be at least 8 characters';
isWorking = false;
return;
}
enterBtn.textContent = 'Loading...';
enterBtn.disabled = true;
currentPassword = password;
fileHash = await generateFilenameHash(password);
try {
const response = await fetch('/api/load', {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify({ hash: fileHash })
});
const data = await response.json();
if (!response.ok) {
throw new Error(data.error || 'Login failed');
}
currentSalt = base64ToUint8Array(data.salt);
let content = '';
if (data.content) {
const key = await deriveKey(currentPassword, currentSalt);
content = await decrypt(data.content, key);
}
document.getElementById('editor').value = content;
document.getElementById('loginScreen').style.display = 'none';
document.getElementById('editorScreen').style.display = 'flex';
setupAutoSave();
updateSaveStatus('Ready');
updateWordCount();
} catch (error) {
errorDiv.textContent = error.message.includes('Decryption') ? 'Invalid password' : 'Connection error';
} finally {
isWorking = false;
enterBtn.textContent = 'Enter';
enterBtn.disabled = false;
}
}
function setupAutoSave() {
const editor = document.getElementById('editor');
editor.addEventListener('input', () => {
clearTimeout(saveTimeout);
updateSaveStatus('Typing...');
updateWordCount();
saveTimeout = setTimeout(saveContent, 1500);
});
}
async function saveContent() {
if (isWorking) return;
isWorking = true;
updateSaveStatus('Saving...');
const content = document.getElementById('editor').value;
try {
const key = await deriveKey(currentPassword, currentSalt);
const encryptedContent = await encrypt(content, key);
const response = await fetch('/api/save', {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify({
hash: fileHash,
content: encryptedContent
})
});
if (response.ok) {
updateSaveStatus('Saved');
} else {
const data = await response.json();
updateSaveStatus(`Error: ${data.error || 'Save failed'}`);
}
} catch (error) {
console.error('Save failed:', error);
updateSaveStatus('Save failed');
} finally {
isWorking = false;
}
}
function goToLogin() {
const statusDiv = document.getElementById('saveStatus');
// Check if there are unsaved changes
if (!statusDiv.className.includes('saved')) {
if (!confirm('You have unsaved changes. Are you sure you want to leave?')) {
return;
}
}
// Clear sensitive data
currentPassword = '';
currentSalt = null;
fileHash = '';
clearTimeout(saveTimeout);
// Reset UI
document.getElementById('editor').value = '';
document.getElementById('passwordInput').value = '';
document.getElementById('loginError').textContent = '';
document.getElementById('editorScreen').style.display = 'none';
document.getElementById('loginScreen').style.display = 'flex';
document.getElementById('passwordInput').focus();
}
function updateSaveStatus(status) {
const statusDiv = document.getElementById('saveStatus');
statusDiv.textContent = status;
statusDiv.className = 'save-status';
if (status.includes('Saving') || status.includes('Typing')) {
statusDiv.className += ' saving';
} else if (status === 'Saved') {
statusDiv.className += ' saved';
}
}
// Prevent accidental page close
window.addEventListener('beforeunload', function (e) {
const statusDiv = document.getElementById('saveStatus');
// Check if there are unsaved changes
if (!statusDiv.className.includes('saved')) {
e.preventDefault();
e.returnValue = '';
}
});
</script>
</body>
</html>