{% extends "base.html" %}

{% block title %}Stegasoo - Secure Steganography{% endblock %}

{% block content %}
<div class="text-center mb-5">
    <img src="{{ url_for('static', filename='logo.svg') }}" alt="Stegasoo" height="120" class="mb-3">
    <h1 class="display-4 fw-bold">Stegasoo</h1>
    <p class="lead text-muted">Hide encrypted messages in plain sight using advanced steganography</p>
</div>

<div class="row g-4 mb-5">
    <div class="col-md-4">
        <div class="card h-100 feature-card">
            <div class="card-header text-center py-3">
                <i class="bi bi-key-fill fs-1"></i>
            </div>
            <div class="card-body text-center">
                <h5 class="card-title">Generate Keys</h5>
                <p class="card-text text-muted">
                    Create your weekly phrase card and PIN. Memorize 21 words + 6 digits for maximum security.
                </p>
                <a href="/generate" class="btn btn-primary">
                    <i class="bi bi-plus-circle me-1"></i> Generate
                </a>
            </div>
        </div>
    </div>
    
    <div class="col-md-4">
        <div class="card h-100 feature-card">
            <div class="card-header text-center py-3">
                <i class="bi bi-lock-fill fs-1"></i>
            </div>
            <div class="card-body text-center">
                <h5 class="card-title">Encode Message</h5>
                <p class="card-text text-muted">
                    Hide your secret message inside an innocent-looking image using your phrase + PIN.
                </p>
                <a href="/encode" class="btn btn-primary">
                    <i class="bi bi-upload me-1"></i> Encode
                </a>
            </div>
        </div>
    </div>
    
    <div class="col-md-4">
        <div class="card h-100 feature-card">
            <div class="card-header text-center py-3">
                <i class="bi bi-unlock-fill fs-1"></i>
            </div>
            <div class="card-body text-center">
                <h5 class="card-title">Decode Message</h5>
                <p class="card-text text-muted">
                    Extract and decrypt hidden messages from stego images using your credentials.
                </p>
                <a href="/decode" class="btn btn-primary">
                    <i class="bi bi-download me-1"></i> Decode
                </a>
            </div>
        </div>
    </div>
</div>

<div class="card">
    <div class="card-header">
        <h5 class="mb-0"><i class="bi bi-diagram-3 me-2"></i>How It Works</h5>
    </div>
    <div class="card-body">
        <div class="row">
            <div class="col-md-6">
                <h6 class="text-primary"><i class="bi bi-1-circle me-2"></i>Key Components</h6>
                <ul class="list-unstyled">
                    <li class="mb-2">
                        <i class="bi bi-image text-info me-2"></i>
                        <strong>Reference Photo</strong> — Any photo you and recipient both have
                    </li>
                    <li class="mb-2">
                        <i class="bi bi-chat-quote text-info me-2"></i>
                        <strong>Day Phrase</strong> — 3 words, different each day of the week
                    </li>
                    <li class="mb-2">
                        <i class="bi bi-123 text-info me-2"></i>
                        <strong>Static PIN</strong> — 6 digits, same every day
                    </li>
                </ul>
            </div>
            <div class="col-md-6">
                <h6 class="text-primary"><i class="bi bi-2-circle me-2"></i>Security Features</h6>
                <ul class="list-unstyled">
                    <li class="mb-2">
                        <i class="bi bi-shield-check text-success me-2"></i>
                        Argon2id memory-hard key derivation (256MB)
                    </li>
                    <li class="mb-2">
                        <i class="bi bi-shuffle text-success me-2"></i>
                        Pseudo-random pixel selection (defeats steganalysis)
                    </li>
                    <li class="mb-2">
                        <i class="bi bi-lock text-success me-2"></i>
                        AES-256-GCM authenticated encryption
                    </li>
                </ul>
            </div>
        </div>
    </div>
</div>
{% endblock %}