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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: #333;
}

.background-pattern {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.1;
    background-image: 
        radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(120, 219, 255, 0.3) 0%, transparent 50%);
    z-index: -1;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.header {
    text-align: center;
    margin-bottom: 40px;
    animation: fadeInDown 0.8s ease-out;
}

.header h1 {
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(135deg, #ffffff 0%, #f0f0f0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
    text-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.header p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 1.2rem;
    font-weight: 300;
}

.form-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 24px;
    padding: 40px;
    box-shadow: 
        0 20px 40px rgba(0, 0, 0, 0.1),
        0 0 0 1px rgba(255, 255, 255, 0.2);
    margin-bottom: 30px;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin-bottom: 30px;
}

.form-group {
    position: relative;
}

.form-group label {
    display: block;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 8px;
    font-size: 0.95rem;
    letter-spacing: 0.025em;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 16px 20px;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    font-size: 16px;
    background: #ffffff;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    outline: none;
}

.form-group input:focus,
.form-group select:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    transform: translateY(-2px);
}

.form-group input:hover,
.form-group select:hover {
    border-color: #cbd5e0;
    transform: translateY(-1px);
}

.submit-btn {
    width: 100%;
    padding: 18px 32px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    position: relative;
    overflow: hidden;
}

.submit-btn:before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.submit-btn:hover:before {
    left: 100%;
}

.submit-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 24px rgba(102, 126, 234, 0.4);
}

.submit-btn:active {
    transform: translateY(-1px);
}

.result-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 24px;
    padding: 40px;
    box-shadow: 
        0 20px 40px rgba(0, 0, 0, 0.1),
        0 0 0 1px rgba(255, 255, 255, 0.2);
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

.result-header {
    text-align: center;
    margin-bottom: 30px;
}

.result-header h2 {
    font-size: 2rem;
    font-weight: 700;
    color: #2d3748;
    margin-bottom: 10px;
}

.result-header p {
    color: #718096;
    font-size: 1.1rem;
}

.meal-plan {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 25px;
}

.day-card {
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    border-radius: 16px;
    padding: 25px;
    border: 1px solid rgba(226, 232, 240, 0.6);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.day-card:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.day-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.1);
}

.day-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: #2d3748;
    margin-bottom: 20px;
    text-align: center;
}

.meal-item {
    background: rgba(102, 126, 234, 0.05);
    padding: 15px;
    border-radius: 12px;
    margin-bottom: 12px;
    border-left: 4px solid #667eea;
    transition: all 0.3s ease;
    font-size: 0.95rem;
    line-height: 1.5;
    position: relative;
}

.meal-item:hover {
    background: rgba(102, 126, 234, 0.1);
    transform: translateX(4px);
}

.meal-item:last-child {
    margin-bottom: 0;
}

.calories-badge {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    float: right;
    margin-left: 8px;
}

.loading {
    display: none;
    text-align: center;
    padding: 20px;
}

.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto 10px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }

    .header h1 {
        font-size: 2.5rem;
    }

    .form-card,
    .result-card {
        padding: 25px;
    }

    .form-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .meal-plan {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}