:root {
    --primary: #FF6B6B;
    --secondary: #4ECDC4;
    --accent: #FFE66D;
    --dark: #2C3E50;
    --light: #F7F9FC;
    --border: #E0E0E0;
    --shadow: rgba(0, 0, 0, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: var(--dark);
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
}

.hero {
    text-align: center;
    margin-bottom: 3rem;
    color: white;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 0.5rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.tagline {
    font-size: 1.3rem;
    opacity: 0.9;
}

.card {
    background: white;
    border-radius: 15px;
    padding: 2.5rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    margin-bottom: 2rem;
}

.card h2 {
    color: var(--primary);
    margin-bottom: 1rem;
}

.features {
    list-style: none;
    margin: 1.5rem 0;
}

.features li {
    padding: 0.75rem 0;
    font-size: 1.1rem;
}

.cta {
    text-align: center;
    margin-top: 2rem;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: var(--primary);
    color: white;
}

.btn-primary:hover {
    background: #ff5252;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 107, 107, 0.4);
}

.btn-secondary {
    background: var(--secondary);
    color: white;
    margin-left: 1rem;
}

.btn-secondary:hover {
    background: #3dbdb3;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(78, 205, 196, 0.4);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.2rem;
    width: 100%;
}

footer {
    text-align: center;
    color: white;
    padding: 2rem 0;
    opacity: 0.8;
}

.header {
    margin-bottom: 2rem;
    text-align: center;
}

.header h1 {
    color: white;
    margin-bottom: 0.5rem;
}

.back-link {
    color: white;
    text-decoration: none;
    font-weight: 600;
    display: inline-block;
    margin-bottom: 1rem;
    opacity: 0.9;
}

.back-link:hover {
    opacity: 1;
    text-decoration: underline;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--dark);
}

.radio-group {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.radio-label {
    display: flex;
    align-items: center;
    padding: 0.75rem 1.25rem;
    border: 2px solid var(--border);
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--light);
}

.radio-label:hover {
    border-color: var(--primary);
    background: white;
}

.radio-label input[type="radio"] {
    margin-right: 0.5rem;
}

.radio-label input[type="radio"]:checked + span {
    font-weight: 700;
}

.radio-label:has(input:checked) {
    border-color: var(--primary);
    background: white;
    box-shadow: 0 2px 8px var(--shadow);
}

.drop-zone {
    border: 3px dashed var(--border);
    border-radius: 15px;
    padding: 3rem;
    text-align: center;
    background: var(--light);
    transition: all 0.3s ease;
    cursor: pointer;
}

.drop-zone:hover {
    border-color: var(--secondary);
    background: white;
}

.drop-zone.dragover {
    border-color: var(--primary);
    background: #fff5f5;
    transform: scale(1.02);
}

.drop-zone-content p {
    margin: 0.5rem 0;
    color: var(--dark);
}

.or-text {
    color: #999;
    font-style: italic;
}

.file-name {
    margin-top: 1rem;
    font-weight: 600;
    color: var(--primary);
}

textarea {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--border);
    border-radius: 10px;
    font-family: 'Courier New', monospace;
    font-size: 0.95rem;
    resize: vertical;
    transition: border-color 0.3s ease;
}

textarea:focus {
    outline: none;
    border-color: var(--secondary);
}

.error-page {
    text-align: center;
    padding: 3rem 0;
}

.error-page h1 {
    font-size: 5rem;
    color: var(--primary);
    margin-bottom: 1rem;
}

.error-page h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.error-page p {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    opacity: 0.8;
}