Update -> refactor and optimize UI , code ,...

README.md

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+# SafePaste
+
+A minimal, encrypted pastebin built with PHP, MySQL, and Redis.
+
+## Features
+
+- **AES-256-CBC encryption** — all pastes are encrypted at rest using a master key
+- **Optional password protection** — bcrypt-hashed passwords per paste
+- **TTL expiry via Redis** — short-lived pastes live only in Redis; permanent pastes use MySQL
+- **Clean dark UI** — responsive, accessible, no external dependencies
+
+## Project Structure
+
+```
+safe-paste/
+├── app/
+│   ├── config/config.php       # Loads .env settings
+│   ├── core/
+│   │   ├── db.php              # PDO connection
+│   │   ├── redis.php           # Redis singleton
+│   │   └── security.php        # Encrypt/decrypt helpers
+│   ├── controllers/
+│   │   ├── SaveController.php  # POST handler: create paste
+│   │   └── ViewController.php  # GET/POST handler: view paste
+│   └── models/Paste.php        # Save/get paste (Redis + MySQL)
+└── public/
+    ├── index.php               # Home page + save action
+    ├── view.php                # View paste page
+    ├── error.php               # Error page
+    ├── .htaccess               # URL routing
+    └── assets/
+        ├── css/style.css
+        └── js/app.js
+```
+
+## Setup
+
+1. Copy `.env.example` to `.env` and fill in your values
+2. Create the MySQL database and table:
+
+```sql
+CREATE DATABASE paste CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+USE paste;
+CREATE TABLE pastes (
+    id            CHAR(32)     PRIMARY KEY,
+    encrypted_text TEXT        NOT NULL,
+    iv            VARCHAR(64)  NOT NULL,
+    expire_time   INT          DEFAULT NULL,
+    password_hash VARCHAR(255) DEFAULT NULL,
+    created_at    TIMESTAMP    DEFAULT CURRENT_TIMESTAMP
+);
+```
+
+3. Point your web server document root to `public/`
+4. Ensure `mod_rewrite` is enabled (Apache) or configure your nginx equivalent
+
+## .env
+
+```ini
+MASTER_KEY=your-random-secret-key
+DB_HOST=localhost
+DB_NAME=paste
+DB_USER=root
+DB_PASS=secret
+REDIS_HOST=127.0.0.1
+REDIS_PORT=6379
+APP_URL=https://yourdomain.com
+```